Imaging optical lens system, image capturing unit and electronic device

Abstract

An imaging optical lens comprises five lenses. The five lenses, arranged sequentially from the object side to the image side along the optical path, are a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The first lens has positive refractive power. The object-side surface of the first lens is convex near the optical axis. The object-side surface of the second lens is convex near the optical axis. The image-side surface of the second lens is concave near the optical axis. The third lens has negative refractive power. The object-side surface of the third lens is concave near the optical axis. The fourth lens has positive refractive power. At least one lens in the imaging optical lens has a point of inflection. When the subject is at infinity, the imaging optical lens is in a first state. Under certain conditions, the imaging optical lens can simultaneously meet the requirements of shift focusing, telephoto capability, miniaturization, and high image quality.

Description

Technical Field

[0001] This disclosure relates to an imaging optical lens, an image capturing device, and an electronic device, particularly an imaging optical lens and an image capturing device suitable for electronic devices. Prior Technology

[0002] With advancements in semiconductor manufacturing technology, the performance of electronic image sensors has improved, allowing pixels to reach smaller sizes. As a result, optical lenses with high image quality have become an indispensable component.

[0003] In recent years, the demand for thinner and lighter electronic products has made it difficult for traditional photographic lenses to simultaneously meet the requirements of high specifications and miniaturization, especially for microlenses with large apertures or telephoto capabilities. Conventional telephoto lens technology is gradually becoming insufficient (too long overall length, too small aperture, insufficient image quality, or inability to be miniaturized), thus requiring different optical characteristics or configurations with optical axis reversals. Due to the thickness limitations of electronic devices, some optical lenses undergo cutting in the lens barrel or lens elements to reduce the length of a single axis, helping to save module space. Furthermore, reflective elements can be added to provide different optical path directions for the system, giving the lens more flexibility in its use and allowing it to achieve telephoto capabilities at long focal lengths.

[0004] With the rapid development of technology, electronic devices equipped with optical lenses are being used in a wider range of applications, leading to more diverse requirements for these lenses. Because traditional optical lenses have struggled to achieve a balance between image quality, sensitivity, aperture size, size, and viewing angle, this invention provides an optical lens with high image quality to meet these demands. Summary of the Invention

[0005] This disclosure provides an imaging optical lens, an image capturing device, and an electronic device. The imaging optical lens comprises multiple lenses arranged sequentially from the object side to the image side along the optical path. Under certain conditions, the imaging optical lens provided by this disclosure can simultaneously meet the requirements of shift focusing, telephoto capability, miniaturization, and high image quality.

[0006] This disclosure provides an imaging optical lens comprising five lenses. The five lenses, arranged sequentially from the object side to the image side along the optical path direction, are a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. Each of the five lenses has an object-side surface facing the object side and an image-side surface facing the image side. Preferably, the first lens has positive refractive power. Preferably, the object-side surface of the first lens is convex near the optical axis. Preferably, the object-side surface of the second lens is convex near the optical axis. Preferably, the image-side surface of the second lens is concave near the optical axis. Preferably, the third lens has negative refractive power. Preferably, the object-side surface of the third lens is concave near the optical axis. Preferably, the fourth lens has positive refractive power. Preferably, at least one surface of at least one lens in the imaging optical lens has at least one inflection point. The imaging optical lens is in a first state when the subject is at infinity. In the first state, the distance from the image-side surface of the lens closest to the image side to the imaging plane on the optical axis is BLL; the distance from the object-side surface of the lens closest to the object side to the image-side surface of the lens closest to the image side on the optical axis is TDL; the radius of curvature of the object-side surface of the first lens is R1; the radius of curvature of the object-side surface of the third lens is R5; the focal length of the second lens is f2; and the focal length of the third lens is f3. Preferably, the following conditions are satisfied:

[0007] 2.00 < BLL / TDL < 5.50;

[0008] -0.50 < (R1-R5) / (R1+R5) < 5.00; and

[0009] 0 < |f3 / f2| < 1.00.

[0010] This disclosure also provides an imaging optical lens comprising five lenses. The five lenses, arranged sequentially from the object side to the image side along the optical path direction, are a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. Each of the five lenses has an object-side surface facing the object side and an image-side surface facing the image side. Preferably, the first lens has positive refractive power. Preferably, the object-side surface of the first lens is convex near the optical axis. Preferably, the object-side surface of the second lens is convex near the optical axis. Preferably, the third lens has negative refractive power. Preferably, the object-side surface of the third lens is concave near the optical axis. Preferably, the fourth lens has positive refractive power. Preferably, at least one surface of at least one lens in the imaging optical lens has at least one inflection point. The imaging optical lens is in a first state when the subject is at infinity. In the first state, the distance from the image-side surface of the lens closest to the image side to the imaging plane on the optical axis is BLL; the distance from the object-side surface of the lens closest to the object side to the image-side surface of the lens closest to the image side on the optical axis is TDL; the refractive index of the first lens is N1; the refractive index of the fifth lens is N5; the Abbe number of the fifth lens is V5; the thickness of the fifth lens on the optical axis is CT5; and the distance between the fourth and fifth lenses on the optical axis in the first state is T45L. Preferably, the following conditions are satisfied:

[0011] 2.00 < BLL / TDL < 5.50;

[0012] 1.750 < N1 < 2.200;

[0013] 5.00 < V5 / N5 < 15.20; and

[0014] 0.10 < CT5 / T45L < 3.00.

[0015] This disclosure also provides an imaging optical lens, which sequentially comprises a movable lens group and a final lens group along the optical path direction from the object side to the image side. The movable lens group includes at least one lens, and the final lens group includes at least one lens. The lenses in the imaging optical lens each have an object-side surface facing the object side and an image-side surface facing the image side. When the subject is at infinity, the imaging optical lens is in a first state. When the subject is at a finite object distance, the imaging optical lens is in a second state. When the subject moves from infinity to a finite object distance, the imaging optical lens performs a focusing process to change from the first state to the second state. During the focusing process of the imaging optical lens changing from the first state to the second state, the movable lens group moves relative to the final lens group along the optical axis. Preferably, the object-side surface of the lens closest to the object side in the imaging optical lens is convex near the optical axis. Preferably, at least one surface of at least one lens in the imaging optical lens has at least one inflection point. In the first state, the distance from the image-side surface of the lens closest to the image side to the imaging plane on the optical axis is BLL; the distance from the object-side surface of the lens closest to the object side to the image-side surface of the lens closest to the image side on the optical axis is TDL; and the aperture value of the imaging optical lens in the first state is FnoL. Preferably, it satisfies the following conditions:

[0016] 2.00 < BLL / TDL < 5.50; and

[0017] 1.80 < FnoL < 2.50.

[0018] This disclosure provides an imaging device comprising the aforementioned imaging optical lens and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on the imaging surface of the imaging optical lens.

[0019] This disclosure provides an electronic device that includes the aforementioned image capturing device.

[0020] When the BLL / TDL meets the above conditions, the appropriate back focal length can be adjusted to facilitate optical path folding.

[0021] When (R1-R5) / (R1+R5) satisfies the above conditions, the radius of curvature of the object-side surface of the first lens and the radius of curvature of the object-side surface of the third lens can be adjusted so that these two surfaces have a more curved surface shape, which helps to maintain the back focal length and increase the imaging surface at the same time.

[0022] When |f3 / f2| meets the above conditions, the refractive power of the second and third lenses can be balanced, which helps to balance the convergence or divergence of light and improve the light-gathering quality of the entire field of view.

[0023] When N1 meets the above conditions, the refractive index of the first lens can be adjusted, which helps the first lens to have a strong ability to converge light while reducing the impact of temperature effects on imaging.

[0024] When V5 / N5 meets the above conditions, the material configuration of the fifth lens can be adjusted, which helps to balance the chromatic aberration correction between different wavelengths of light, thereby improving the image quality.

[0025] When the CT5 / T45L meets the above conditions, the distance between the fourth and fifth lenses can be large, which helps to balance the incident angle of light on the imaging plane during focusing, thereby avoiding the generation of stray light.

[0026] When FnoL meets the above conditions, it can achieve a balance between illumination and depth of field, and can enhance the amount of light entering the camera to improve image quality. Simple Explanation of the Diagram

[0027] Figure 1 illustrates a schematic diagram of the imaging device according to the first embodiment of this disclosure in a first state and a second state. Figure 2, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the first embodiment in the first state. Figure 3, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the first embodiment in the second state. Figure 4 illustrates a schematic diagram of the imaging device according to the second embodiment of this disclosure in a first state and a second state. Figure 5, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the second embodiment in the first state. Figure 6 shows, from left to right, the spherical aberration, astigmatism, and distortion curves of the imaging device of the second embodiment in the second state. Figure 7 illustrates schematic diagrams of the imaging device according to the third embodiment of this disclosure in a first state and a second state. Figure 8, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the third embodiment in the first state. Figure 9, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the third embodiment in the second state. Figure 10 illustrates a schematic diagram of the imaging device according to the fourth embodiment of this disclosure in a first state and a second state. Figure 11 shows, from left to right, the spherical aberration, astigmatism, and distortion curves of the imaging device of the fourth embodiment in the first state. Figure 12 shows, from left to right, the spherical aberration, astigmatism, and distortion curves of the imaging device of the fourth embodiment in the second state. Figure 13 illustrates a schematic diagram of the imaging device according to the fifth embodiment of this disclosure in a first state and a second state. Figure 14, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the fifth embodiment in its first state. Figure 15, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the fifth embodiment in the second state. Figure 16 illustrates schematic diagrams of the imaging device according to the sixth embodiment of this disclosure in a first state and a second state. Figure 17 shows, from left to right, the spherical aberration, astigmatism, and distortion curves of the imaging device of the sixth embodiment in its first state. Figure 18 shows, from left to right, the spherical aberration, astigmatism, and distortion curves of the imaging device of the sixth embodiment in the second state. Figure 19 illustrates a schematic diagram of the imaging device according to the seventh embodiment of this disclosure in a first state and a second state. Figure 20 shows, from left to right, the spherical aberration, astigmatism, and distortion curves of the imaging device of the seventh embodiment in its first state. Figure 21 shows, from left to right, the spherical aberration, astigmatism, and distortion curves of the imaging device of the seventh embodiment in the second state. Figure 22 illustrates schematic diagrams of the imaging device according to the eighth embodiment of this disclosure in a first state and a second state. Figure 23, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the eighth embodiment in its first state. Figure 24, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the eighth embodiment in the second state. Figure 25 illustrates a schematic diagram of the imaging device according to the ninth embodiment of this disclosure in a first state and a second state. Figure 26, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the ninth embodiment in its first state. Figure 27, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the ninth embodiment in the second state. Figure 28 illustrates a schematic diagram of the imaging device according to the tenth embodiment of this disclosure in a first state and a second state. Figure 29, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the tenth embodiment in its first state. Figure 30, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the tenth embodiment in the second state. Figure 31 illustrates a perspective view of an imaging device according to the eleventh embodiment of this disclosure. Figure 32 illustrates a perspective view of one side of an electronic device according to the twelfth embodiment of this disclosure. Figure 33 shows a three-dimensional schematic diagram of the other side of the electronic device in Figure 32. Figure 34 shows a system block diagram of the electronic device in Figure 32. Figure 35 illustrates a schematic diagram of one side of an electronic device according to the thirteenth embodiment of this disclosure. Figure 36 shows a schematic diagram of the other side of the electronic device in Figure 35. Figure 37 illustrates a perspective view of one side of an electronic device according to the fourteenth embodiment of this disclosure. Figure 38 illustrates a schematic diagram of the parameters Y1R1L, Y5R2L, ET12L, Sag2R1L, and ImgH of the imaging device according to the first embodiment of this disclosure in a first state. Figure 39 illustrates a schematic diagram of the inflection point and the critical point on the lens surface of the imaging device according to the first embodiment of this disclosure in a first state. Figure 40 illustrates a schematic diagram of the shape configuration of the aperture of an imaging optical lens in an embodiment according to this disclosure. Figure 41 illustrates a schematic diagram of the shape configuration of the aperture of an imaging optical lens in another embodiment of this disclosure. Figures 42 to 44 respectively illustrate a configuration of a reflective element in an imaging optical lens according to the present invention. Figures 45 and 46 respectively illustrate a schematic diagram of one configuration relationship of the two reflective elements disclosed herein in an imaging optical lens. Figure 47 illustrates a schematic diagram of the configuration of a dual-reflection element in an imaging optical lens according to the present disclosure. Figure 48 illustrates a schematic diagram of the configuration of a three-reflection element in an imaging optical lens according to the present invention. Figure 49 illustrates a schematic diagram of the configuration of a four-reflection element in an imaging optical lens according to the present invention. Figure 50 illustrates a schematic diagram of the configuration of a five-reflection element in an imaging optical lens according to the present disclosure. Figure 51 illustrates a schematic diagram of the configuration of a reflective element in an imaging optical lens according to the present disclosure. Figure 52 illustrates a schematic diagram of another configuration of a reflective element in an imaging optical lens according to the present disclosure. Figure 53 illustrates the optical path reversal in the first state of the configuration of the imaging device and a reflective element according to the first embodiment of this disclosure. Figure 54 illustrates the optical path reversal in the first state of the configuration of the imaging device with another reflective element according to the first embodiment of this disclosure. Figure 55 illustrates the optical path reversal in the first state of the configuration of the imaging device with another reflective element according to the first embodiment of this disclosure. Figure 56 illustrates the optical path reversal in the first state of the configuration of the imaging device with another reflective element according to the first embodiment of this disclosure. Figure 57 illustrates the optical path reversal in the first state of the configuration of the imaging device with another reflective element according to the first embodiment of this disclosure. Figure 58 illustrates the optical path reversal in the first state of the configuration of the imaging device with another reflective element according to the first embodiment of this disclosure. Figure 59 illustrates the configuration and optical path reversal of the imaging device with one of the reflective elements in the first embodiment of this disclosure in the first state and the second state, respectively. Figure 60 illustrates a schematic diagram of one embodiment of the reflective element according to the first embodiment of this disclosure. Figure 61 shows a three-dimensional schematic diagram of the reflective element in Figure 60 before it has been formed with chamfered edges and grooves. Figure 62 shows a three-dimensional schematic diagram of the reflective element of Figure 60, which has a chamfered edge and a groove. Implementation

[0028] An imaging optical lens comprises, sequentially from the object side to the image side along the optical path, a movable lens group and a final lens group. The movable lens group includes at least one lens, and the final lens group includes at least one lens. The lenses in the imaging optical lens each have an object-side surface facing the object side and an image-side surface facing the image side. This arrangement of the two lens groups allows for a balance between size, adjustable focusing distance, image quality, and ease of assembly.

[0029] When the subject is at infinity, the imaging optical lens is in its first state. When the subject is at a finite object distance, the imaging optical lens is in its second state. When the subject moves from infinity to a finite object distance, the imaging optical lens performs a focusing process to transition from the first state to the second state. Conversely, when the subject moves from a finite object distance to infinity, the imaging optical lens also performs a focusing process to transition from the second state to the first state. The object distance refers to the distance along the optical axis from the subject to the object-side surface of the lens closest to the object side of the imaging optical lens. When the object distance is 1,000,000 mm or more, it can be considered a shooting state with an infinity object distance. When the object distance is 5,000 mm or less, it can be considered a shooting state with a finite object distance.

[0030] The movable lens group moves along the optical axis relative to the final lens group during the focusing process of the imaging optical lens transitioning from the first state to the second state. This helps to achieve a close-up effect and simplifies the complexity of the optical design and mechanism. Specifically, the movable lens group can move towards the object side relative to the final lens group along the optical axis during the focusing process of the imaging optical lens transitioning from the first state to the second state. Referring to Figure 1, schematic diagrams of the imaging device according to the first embodiment of this disclosure are shown in the first state (infinity object distance) and the second state (finite object distance), where the upper half of Figure 1 is a schematic diagram of the imaging optical lens in the first state, and the lower half of Figure 1 is a schematic diagram of the imaging optical lens in the second state.

[0031] The lenses in the moving lens group can remain stationary relative to each other during the focusing process, and ultimately, the lenses in the final lens group can also remain stationary relative to each other during the focusing process. This simplifies the complexity of the mechanism.

[0032] In an imaging optical lens, the lens closest to the object side can have a convex surface near the optical axis. This allows adjustment of the surface shape of the lens closest to the object side, which helps to compress the outer diameter of the object-side end of the imaging optical lens.

[0033] The imaging optical lens disclosed herein may further include a reflective element, wherein the reflective element may be located between the final lens group and the imaging plane along the optical path direction, and there are no other lenses on the optical axis between the final lens group and the reflective element. This allows for different optical path orientations for the imaging optical lens, making the lens spatial configuration more flexible and helping to reduce structural limitations and miniaturize the lens.

[0034] During the focusing process, the final lens group can remain stationary relative to the reflecting element. This helps simplify the complexity of the mechanism design, thereby improving lens assembly yield.

[0035] The reflecting element can be a prism, and the prism can have at least two reflecting surfaces; thereby, the transmitted light undergoes multiple reflections within the prism to form an image, which helps to reduce the overall size of the imaging device. The prism can further have a first transmitting surface, and the at least two reflecting surfaces of the prism can sequentially include a first reflecting surface and a second reflecting surface along the optical path from the object side to the image side. The first transmitting surface, the first reflecting surface, and the second reflecting surface are arranged sequentially along the optical path from the object side to the image side, and the first transmitting surface and the second reflecting surface can be located in the same plane; thereby, it helps to simplify the structure of the prism and reduce the space required by the prism. The prism can also have at least three reflecting surfaces. Please refer to Figure 59, which illustrates the configuration and optical path reversal of the imaging device with one of the reflective elements in the first and second states according to the first embodiment of this disclosure. The upper part of Figure 59 is a schematic diagram of the imaging optical lens in the first state, while the lower part of Figure 59 is a schematic diagram of the imaging optical lens in the second state. As shown in Figure 59, the reflective element E6 has a first penetrating surface LP1, a first reflecting surface RF1, a second reflecting surface RF2, a third reflecting surface RF3, and a second penetrating surface LP2 in sequence along the optical path direction, wherein the first penetrating surface LP1 and the second reflecting surface RF2 are located in the same plane.

[0036] The focal length of the imaging optical lens in the first state is fL, and the focal length of the moving lens group is fG1, which satisfies the following condition: 0.80 < fL / fG1 < 1.80. This allows adjustment of the focal length of the moving lens group, thus helping to balance the amount of movement and maintain the back focal length within a limited space during focusing. The following condition can also be satisfied: 0.95 < fL / fG1 < 1.70. The focal length of the moving lens group can refer to the combined focal length of all lenses in the moving lens group.

[0037] In the second state of the imaging optical lens, the distance on the optical axis from the object-side surface of the lens closest to the object side to the image-side surface of the lens closest to the image side is TDS. In the first state of the imaging optical lens, the distance on the optical axis from the object-side surface of the lens closest to the object side to the image-side surface of the lens closest to the image side is TDL. This distance satisfies the following condition: 0.30 mm < |TDS - TDL| < 1.10 mm. Therefore, by using a moving lens group with a larger lens configuration, it is helpful to achieve the shooting of objects at smaller object distances with a smaller amount of movement during focusing. This also satisfies the following condition: 0.50 mm < |TDS - TDL| < 0.95 mm.

[0038] The distance on the optical axis from the object-side surface of the lens closest to the object side in the moving lens group to the image-side surface of the lens closest to the image side in the moving lens group is DG1. The distance on the optical axis from the object-side surface of the lens closest to the object side in the final lens group to the image-side surface of the lens closest to the image side in the final lens group is DG2. This can satisfy the following condition: 0.01 < DG2 / DG1 < 0.40. This allows adjustment of the lengths of the moving lens group and the final lens group on the optical axis, helping to balance the spatial arrangement of the lenses and reduce system sensitivity during focusing. The following conditions can also be satisfied: 0.02 < DG2 / DG1 < 0.30. The following conditions can also be satisfied: 0.04 < DG2 / DG1 < 0.20.

[0039] In the second state of the imaging optical lens, the distance on the optical axis from the object-side surface of the lens closest to the object side to the image-side surface of the lens closest to the image side is TDS. In the first state of the imaging optical lens, the distance on the optical axis from the object-side surface of the lens closest to the object side to the image-side surface of the lens closest to the image side is TDL. This distance satisfies the following condition: 1.00 < 10 × |TDS - TDL| / TDL < 2.50. By maintaining the amount of movement of the moving lens group during the focusing process, it is helpful to capture objects at smaller object distances and meet the requirements of large-size image sensors, thus improving image quality. The following condition can also be satisfied: 1.40 < 10 × |TDS - TDL| / TDL < 2.42.

[0040] In the second state, the distance from the object-side surface of the lens closest to the object to the imaging plane on the optical axis is TLS. In the first state, the distance from the object-side surface of the lens closest to the object to the imaging plane on the optical axis is TLL. This distance satisfies the following condition: 1.025 < TLS / TLL < 1.100. By controlling the total lens length during the focusing process, it is helpful to improve the image quality of shooting objects at smaller object distances within the size limitations of electronic devices. This distance also satisfies the following condition: 1.030 < TLS / TLL < 1.080.

[0041] An imaging optical lens may comprise five lenses, arranged sequentially from the object side to the image side along the optical path as a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. A movable lens group may comprise the first, second, third, and fourth lenses, and the final lens group may comprise the fifth lens. The first lens may also be referred to as the lens closest to the object side, and the fifth lens may also be referred to as the lens closest to the image side.

[0042] The first lens can have positive refractive power; thereby, the refractive power of the movable lens group can be adjusted to converge light, thus helping to simultaneously control the shooting angle and increase the amount of light entering. The object-side surface of the first lens can be convex near the optical axis; thereby, it helps to compress the outer diameter of the object-side end of the imaging optical lens. The first lens can be made of glass; thereby, using a glass lens can effectively reduce sensitivity to environmental factors and provide high stability in various environments. Furthermore, using a glass lens near the object-side end of the imaging optical lens helps to resist humid environments and prevent surface scratches, effectively extending the lifespan of electronic products.

[0043] The second lens can have positive refractive power; this helps to balance the back focal length of the imaging lens and correct off-axis aberrations. The object-side surface of the second lens can be convex near the optical axis; this allows adjustment of the second lens's shape and refractive power, helping to improve central image quality. The image-side surface of the second lens can be concave near the optical axis; this allows adjustment of the second lens's refractive power, helping to balance spherical aberration in the imaging lens.

[0044] The third lens can have negative refractive power; this allows adjustment of the refractive power of the third lens, helping to maintain the back focal length. The object-side surface of the third lens can be concave near the optical axis; this allows control of the direction of light rays around the third lens, preventing insufficient refraction of light rays in the peripheral area from causing ineffective light focusing.

[0045] The fourth lens can have positive refractive power. This effectively balances the refractive power of the third lens, preventing excessive aberrations caused by excessive light refraction angle.

[0046] The fifth lens can have negative refractive power. This can balance the refractive power at the image side of the imaging lens, thereby improving the light-gathering quality of each field of view at the imaging plane and reducing aberrations.

[0047] At least one surface of at least one lens in an imaging optical lens may have at least one inflection point. Specifically, in an imaging optical lens, one or more lenses may each have at least one inflection point on at least one surface, and the statement that at least one surface of a single lens has at least one inflection point refers to at least one of the object-side surface and the image-side surface of this single lens having at least one inflection point. This increases the degree of freedom in optical design, facilitating astigmatism correction. Referring to FIG39, a schematic diagram is drawn showing the inflection point P on the lens surface of the imaging device according to the first embodiment of this disclosure in a first state. In FIG39, the image-side surface of the fourth lens E4, the object-side surface of the fifth lens E5, and the image-side surface of the fifth lens E5 each have one inflection point P; the image-side surface of the second lens E2 and the object-side surface of the fourth lens E4 each have two inflection points P; and the object-side surface of the second lens E2, the object-side surface of the third lens E3, and the image-side surface of the third lens E3 each have three inflection points P. Figure 39 illustrates the first embodiment of this disclosure as an exemplary illustration; however, in other embodiments of this disclosure, each lens may have one or more inversion points. The number of inversion points is calculated only within the region of the maximum effective optical diameter of each lens. The maximum effective optical diameter range of each lens may be the region traversed by the optical path tracing line of the imaging optical lens in the first state.

[0048] At least one surface of at least one lens in an imaging optical lens may have at least one critical point off-axis. Specifically, in an imaging optical lens, each of one or more lenses may have at least one critical point off-axis on at least one surface, and the statement that at least one surface of a single lens has at least one critical point off-axis refers to at least one of the object-side surface and image-side surface of this single lens having at least one critical point off-axis. This allows adjustment of the incident angle of light on the imaging plane, control of the peripheral light angle, prevention of vignetting at the image periphery, and reduction of distortion. Referring to FIG39, a schematic diagram is drawn showing the critical point C on the lens surface of the imaging device according to the first embodiment of this disclosure in a first state. In FIG39, the object-side surface of the second lens E2, the image-side surface of the second lens E2, the image-side surface of the third lens E3, the image-side surface of the fourth lens E4, and the image-side surface of the fifth lens E5 each have one critical point C off-axis, and the object-side surface of the fourth lens E4 has two critical points C off-axis. Figure 39 illustrates the first embodiment of this disclosure as an exemplary illustration; however, in other embodiments of this disclosure, each lens may have one or more critical points off-axis. The number of critical points is calculated only within the region of the maximum effective optical diameter of each lens.

[0049] In the first state of the imaging optical lens, the distance from the image-side surface of the lens closest to the image side to the imaging plane on the optical axis is BLL, and the distance from the object-side surface of the lens closest to the object side to the image-side surface of the lens closest to the image side on the optical axis is TDL. These distances satisfy the following conditions: 2.00 < BLL / TDL < 5.50. This allows for adjustment of the appropriate back focal length to facilitate optical path folding. The following conditions can also be satisfied: 2.30 < BLL / TDL < 4.50. The following conditions can also be satisfied: 2.50 < BLL / TDL < 4.20. The following conditions can also be satisfied: 2.67 ≤ BLL / TDL ≤ 3.76.

[0050] The radius of curvature of the object-side surface of the first lens is R1, and the radius of curvature of the object-side surface of the third lens is R5, which can satisfy the following condition: -0.50 < (R1-R5) / (R1+R5) < 5.00. This allows adjustment of the radius of curvature of the object-side surfaces of the first and third lenses, giving them a more curved surface shape, which helps to simultaneously maintain the back focal length and increase the imaging area. The following conditions can also be satisfied: 0.50 < (R1-R5) / (R1+R5) < 4.50. The following conditions can also be satisfied: 1.00 < (R1-R5) / (R1+R5) < 4.00. The following conditions can also be satisfied: 1.36 ≤ (R1-R5) / (R1+R5) ≤ 3.46.

[0051] The second lens has a focal length of f2, and the third lens has a focal length of f3, satisfying the following condition: 0 < |f3 / f2| < 1.00. This balances the refractive power of the second and third lenses, helping to balance the convergence and divergence of light, thus improving the light-gathering quality across the entire field of view. It also satisfies the following conditions: 0 < |f3 / f2| < 0.80. Furthermore, it satisfies the following conditions: 0.01 < |f3 / f2| < 0.60. Finally, it satisfies the following conditions: 0.02 ≤ |f3 / f2| ≤ 0.40.

[0052] The refractive index of the first lens is N1, which satisfies the following condition: 1.750 < N1 < 2.200. This allows the refractive index of the first lens to be adjusted, contributing to its strong light-gathering ability while reducing the impact of temperature effects on imaging. It can also satisfy the following conditions: 1.800 < N1 < 2.100. Furthermore, it can satisfy the following conditions: 1.850 < N1 < 2.000. Finally, it can satisfy the following condition: 1.883 ≤ N1 ≤ 1.954.

[0053] The fifth lens has an Abbe number of V5 and a refractive index of N5, satisfying the following condition: 5.00 < V5 / N5 < 15.20. This allows for adjustment of the fifth lens's material configuration, helping to balance chromatic aberration correction between different wavelengths of light, thereby improving image quality. It also satisfies the following condition: 8.00 < V5 / N5 < 14.80. Furthermore, it satisfies the following condition: 10.91 ≤ V5 / N5 ≤ 14.34.

[0054] The thickness of the fifth lens on the optical axis is CT5. In the first state, the optical distance between the fourth and fifth lenses on the optical axis is T45L, which satisfies the following condition: 0.10 < CT5 / T45L < 3.00. This allows for a larger distance between the fourth and fifth lenses, which helps balance the incident angle of light on the imaging plane during focusing, thus avoiding stray light generation. The following conditions can also be satisfied: 0.15 < CT5 / T45L < 2.00. The following conditions can also be satisfied: 0.20 < CT5 / T45L < 1.20. The following conditions can also be satisfied: 0.30 ≤ CT5 / T45L ≤ 0.87.

[0055] The aperture value (F-number) of the imaging optical lens in the first state is FnoL, which satisfies the following condition: 1.80 < FnoL < 2.50. This achieves a balance between illumination and depth of field, and enhances image quality by increasing the amount of light entering the lens. It also satisfies the following condition: 2.00 < FnoL < 2.40.

[0056] In the first state, the distance from the object-side surface of the lens closest to the object side to the imaging plane along the optical axis is TLL, and the focal length of the imaging lens in the first state is fL, which can satisfy the following condition: 1.30 < TLL / fL < 1.70. This helps to achieve a balance between total length and viewing angle. The following condition can also be satisfied: 1.40 < TLL / fL < 1.60.

[0057] In the first state, the optical lens for imaging has a distance of T45L between the fourth and fifth lenses on the optical axis, and a focal length of fL, which satisfies the following condition: 0.12 < 10 × T45L / fL < 1.00. This balances the total focal length with the distance between the fourth and fifth lenses on the optical axis, helping to maintain the telephoto performance of the long focal length and simplifying the complexity of the mechanism design during focusing. It also satisfies the following condition: 0.18 < 10 × T45L / fL < 0.80.

[0058] The focal length of the imaging optical lens in the first state is fL, and the focal length of the third lens is f3, which satisfies the following condition: -3.00 < fL / f3 < -1.00. This allows the third lens to possess stronger refractive power, helping to balance the convergence and divergence of light, improving high-gathering quality in multi-object-distance shooting, and maintaining the back focal length. It also satisfies the following condition: -2.70 < fL / f3 < -1.20. Furthermore, it satisfies the following condition: -2.76 ≤ fL / f3 ≤ -1.48.

[0059] The radius of curvature of the object-side surface of the first lens is R1, and the radius of curvature of the image-side surface of the second lens is R4, which satisfies the following condition: -1.00 < (R1-R4) / (R1+R4) < 1.50. This effectively balances the radius of curvature of the object-side surface of the first lens and the radius of curvature of the image-side surface of the second lens, helping to improve the focusing quality of the imaging light, effectively reducing image curvature and spherical aberration. It also satisfies the following condition: -0.50 < (R1-R4) / (R1+R4) < 1.00.

[0060] The Abbe number of the fifth lens is V5, which satisfies the following condition: 5.0 < V5 < 30.0. This allows the Abbe number of the fifth lens to be adjusted, helping to correct chromatic aberration. It also satisfies the following condition: 8.0 < V5 < 27.0. Furthermore, it also satisfies the following condition: 15.0 < V5 < 25.0.

[0061] In the first state, the optical lens for imaging has an optical axis spacing of T23L between the second and third lenses, and an optical axis thickness of CT4 for the fourth lens, satisfying the following condition: 0.65 < T23L / CT4 < 2.50. This balances the optical axis spacing between the second and third lenses with the center thickness of the fourth lens, contributing to increased space utilization efficiency. Furthermore, it also satisfies the following condition: 0.70 < T23L / CT4 < 2.20.

[0062] The HFOVL of the imaging optical lens in the first state is half of its maximum angle of view, which satisfies the following condition: 8.0 < HFOVL < 20.0. This allows the imaging optical lens to have an appropriate angle of view for telescopic applications. It also satisfies the following condition: 10.0 < HFOVL < 18.0. Furthermore, it also satisfies the following condition: 12.0 < HFOVL < 16.5.

[0063] In the first state, the maximum effective radius of the object-side surface of the first lens of the imaging optical lens is Y1R1L, and the maximum effective radius of the image-side surface of the fifth lens of the imaging optical lens in the first state is Y5R2L, which can satisfy the following condition: 1.30 < Y1R1L / Y5R2L < 1.80. This helps to control the beam size and avoid the effective diameter of the lens being too large, causing light to have difficulty passing through the reversing element and affecting the imaging of the imaging optical lens. The following condition can also be satisfied: 1.35 < Y1R1L / Y5R2L < 1.65. Please refer to Figure 38, which is a schematic diagram showing the parameters Y1R1L and Y5R2L of the imaging device according to the first embodiment of this disclosure in the first state.

[0064] In the first state, the maximum effective radius of the object-side surface of the imaging optical lens is Y1R1L, and the maximum imaging height of the imaging optical lens (which can be half the total diagonal length of the effective sensing area of ​​the electronic photosensitive element) is ImgH, which satisfies the following condition: 0.65 < Y1R1L / ImgH < 1.20. This balances the effective radius and imaging height of the object-side surface of the first lens and allows adjustment of the light travel direction, helping to compress the outer diameter of the object-side end of the imaging optical lens and increase the imaging surface. It also satisfies the following condition: 0.72 < Y1R1L / ImgH < 1.00. Please refer to Figure 38, which illustrates a schematic diagram of the parameters Y1R1L and ImgH of the imaging device according to the first embodiment of this disclosure in the first state.

[0065] The thickness of the first lens along the optical axis is CT1, and the thickness of the second lens along the optical axis is CT2, which can satisfy the following condition: 0.50 < CT1 / CT2 < 2.20. This balances the ratio of the center thickness of the first lens to the center thickness of the second lens, allowing the first lens to have a stronger light-reflecting ability by adjusting its center thickness. The following condition can also be satisfied: 0.80 < CT1 / CT2 < 2.00.

[0066] In the first state, the focal length of the imaging optical lens is fL, and the radius of curvature of the object-side surface of the third lens is R5, which satisfies the following condition: -9.00 < fL / R5 < -2.00. This allows adjustment of the configuration of the total focal length and the radius of curvature of the object-side surface of the third lens, enabling the imaging optical lens to maintain a small outer diameter and an appropriate back focal length while correcting off-axis aberrations. Furthermore, it also satisfies the following condition: -7.00 < fL / R5 < -2.30.

[0067] The radius of curvature of the object-side surface of the second lens is R3, and the radius of curvature of the image-side surface of the second lens is R4. The focal length of the imaging optical lens in the first state is fL, which satisfies the following condition: 0.20 < |R3 / fL| + |R4 / fL| < 2.20. This effectively balances the radius of curvature of the object-side surface and the radius of curvature of the image-side surface of the second lens, and adjusts the direction of peripheral light travel, helping to correct astigmatism and reduce stray light within the imaging optical lens. The following condition is also satisfied: 0.40 < |R3 / fL| + |R4 / fL| < 2.10.

[0068] The imaging optical lens disclosed in this disclosure may further include an aperture; thereby, the shooting angle of the imaging optical lens can be controlled, and the lens can be ensured to have an appropriate amount of light intake in the telescope structure. The aperture may have a major axis direction and a minor axis direction perpendicular to the optical axis and different from each other, and the effective radius of the aperture in the major axis direction is different from the effective radius of the aperture in the minor axis direction; thereby, the shape of the aperture can be adjusted, which helps to reduce stray light. For example, referring to Figures 40 and 41, which are schematic diagrams illustrating non-circular apertures of imaging optical lenses according to some embodiments of this disclosure, Figure 40 illustrates a schematic diagram of the shape configuration of the aperture of an imaging optical lens according to one embodiment of this disclosure, and Figure 41 illustrates a schematic diagram of the shape configuration of the aperture of an imaging optical lens according to another embodiment of this disclosure. As shown in Figure 40, in some embodiments disclosed herein, the aperture ST is elliptical in shape, having a major axis LX perpendicular to the optical axis OA and a minor axis SY. The directions of the major axis LX and the minor axis SY are opposite, and the effective radius Ra of the aperture ST along the major axis LX is greater than the effective radius Rb of the aperture ST along the minor axis SY. As shown in Figure 41, in some embodiments disclosed herein, the aperture ST has a tangent at its outer diameter, having a major axis LX perpendicular to the optical axis OA and a minor axis SY. The directions of the major axis LX and the minor axis SY are opposite, and the effective radius Ra of the aperture ST along the major axis LX is greater than the effective radius Rb of the aperture ST along the minor axis SY.

[0069] In the first state, the distance from the aperture to the image-side surface of the lens closest to the image side on the optical axis is SDL. The distance from the object-side surface of the lens closest to the object side to the image-side surface of the lens closest to the image side on the optical axis is TDL. This arrangement satisfies the following condition: 0.87 < SDL / TDL < 1.20. This arrangement, with the aperture positioned close to the object side, helps to simultaneously compress the outer diameter of the object-side end of the imaging optical lens and avoid stray light in the peripheral area. Furthermore, it satisfies the following condition: 0.95 < SDL / TDL < 1.10.

[0070] In the first state, the optical lens for imaging has a distance of T34L between the third and fourth lenses on the optical axis, and a thickness of CT2 on the optical axis for the second lens, which satisfies the following condition: 0.80 < T34L / CT2 < 2.00. This balances the center thickness of the second lens with the distance between the third and fourth lenses on the optical axis, helping to correct spherical aberration and reduce manufacturing tolerances. It also satisfies the following condition: 1.00 < T34L / CT2 < 1.50.

[0071] In the first state, the displacement of the second lens's object-side surface from the intersection point on the optical axis to the maximum effective radius position of the object-side surface of the second lens, parallel to the optical axis, is Sag2R1L. The thickness of the second lens on the optical axis is CT2, which satisfies the following condition: 0.40 < Sag2R1L / CT2 < 1.20. This allows the periphery of the second lens to control the beam direction, helping to control the incident angle of light entering the imaging plane and preventing stray light from being generated after passing through the deflection element. It also satisfies the following condition: 0.50 < Sag2R1L / CT2 < 1.00. Referring to Figure 38, a schematic diagram of the parameter Sag2R1L of the imaging device according to the first embodiment of this disclosure in the first state is shown, where the displacement is positive in the image-side direction and negative in the object-side direction.

[0072] In the first state, the distance parallel to the optical axis between the maximum effective radius of the image-side surface of the first lens and the maximum effective radius of the object-side surface of the second lens is ET12L, and the thickness of the second lens on the optical axis is CT2. This satisfies the following condition: 0.70 < ET12L / CT2 < 1.50. This balances the peripheral distances between the first and second lenses, effectively controlling the deflection angle of light incident at the object-side periphery of the second lens to prevent light divergence. It also satisfies the following condition: 0.75 < ET12L / CT2 < 1.40. Please refer to Figure 38, which illustrates a schematic diagram of the parameter ET12L of the imaging device according to the first embodiment of this disclosure in the first state.

[0073] The thickness of the first lens on the optical axis is CT1. In the first state, the distance on the optical axis between the object-side surface of the second lens and the image-side surface of the fourth lens is Dr3r8L, which satisfies the following condition: 0.15 < CT1 / Dr3r8L < 0.65. This allows control over the proportion of the center thickness of the first lens within the moving lens group, helping to accommodate the manufacturing limitations of the first lens and reducing the volume of the imaging optical lens by adjusting the spatial arrangement of the remaining lenses in the moving lens group. It also satisfies the following condition: 0.20 < CT1 / Dr3r8L < 0.48.

[0074] The various technical features of the imaging optical lens disclosed herein can be combined and configured to achieve corresponding effects.

[0075] In the imaging optical lens disclosed in this invention, the lens material can be glass or plastic. If the lens is made of glass, the freedom of refractive power configuration of the imaging optical lens can be increased, and the influence of external environmental temperature changes on imaging can be reduced. Glass lenses can be manufactured using techniques such as grinding or molding. If the lens is made of plastic, production costs can be effectively reduced. Furthermore, spherical (SPH) or aspherical (ASP) surfaces can be incorporated into the lens surface. Spherical lenses reduce manufacturing difficulty, while aspherical surfaces provide more controllable variables to reduce aberrations, decrease the number of lenses, and effectively reduce the overall length of the imaging optical lens disclosed in this invention. Further, aspherical surfaces can be manufactured using methods such as plastic injection molding or molding glass lenses.

[0076] In the imaging optical lens disclosed herein, if the lens surface is aspherical, it means that all or part of the optically effective area of ​​the lens surface is aspherical.

[0077] In the imaging optical lens disclosed herein, additives can be selectively added to any (or more) lens materials to produce light absorption or interference effects, thereby altering the lens's transmittance for specific wavelengths of light and reducing stray light and color shift. For example, the additives may filter out light in the 600-800 nm wavelength range to help reduce excess red or infrared light; or they may filter out light in the 350-450 nm wavelength range to reduce excess blue or ultraviolet light. Therefore, the additives can prevent specific wavelengths of light from interfering with imaging. Furthermore, the additives can be uniformly mixed into plastic and manufactured into a lens using injection molding technology. Additionally, the additives can also be deposited on the lens surface as a coating to provide the aforementioned effects.

[0078] In the imaging optical lens disclosed herein, if the lens surface is convex and the position of the convex surface is not defined, it means that the convex surface can be located near the optical axis of the lens surface; if the lens surface is concave and the position of the concave surface is not defined, it means that the concave surface can be located near the optical axis of the lens surface. If the refractive power, radius of curvature, or focal length of the lens is not defined in its region, it means that the refractive power, radius of curvature, or focal length of the lens can be the refractive power, radius of curvature, or focal length of the lens near the optical axis.

[0079] In the imaging optical lens disclosed herein, the inflection point of the lens surface refers to the boundary point where the curvature of the lens surface changes from positive to negative. The critical point of the lens surface refers to the point of tangency on the tangent line between a plane perpendicular to the optical axis and the lens surface, and the critical point is not located on the optical axis.

[0080] In the imaging optical lens disclosed herein, the imaging surface of the imaging optical lens may be a plane or a curved surface with any curvature, depending on the corresponding electronic photosensitive element, especially a curved surface with a concave surface facing the object side.

[0081] In the imaging optical lens disclosed herein, one or more imaging correction elements (such as planar elements) can be selectively disposed between the lens closest to the imaging plane and the imaging plane in the imaging optical path to achieve the effect of correcting image curvature (such as image warping). The optical properties of the imaging correction element, such as curvature, thickness, refractive index, position, and surface type (convex or concave, spherical or aspherical, diffractive surface, and Fresnel surface, etc.), can be adjusted according to the requirements of the imaging device. Generally, a preferred configuration of the imaging correction element is to place a thin plano-concave element with a concave surface in the object-side direction close to the imaging plane.

[0082] The imaging optical lens disclosed herein may include at least one reflective element, which may be, for example, a prism or a reflective mirror, but this disclosure is not limited thereto. This allows for more flexible spatial configuration. The surface of the prism or the mirror surface of the reflective mirror may be a plane, spherical, aspherical, or freeform surface, providing greater flexibility in the spatial configuration of the imaging optical lens. When the surface of the prism is, for example, a spherical, aspherical, or freeform surface, the prism may also have refractive power, thereby enabling it to converge or diverge light. The reflective element may be positioned between the object being photographed and the imaging surface, which helps to reduce the size of the imaging optical lens. The light path may be reflected once, twice, or more than three times through a single reflective element. Furthermore, the reflective element may have at least one reflecting surface, and the angle between the normal direction of the reflecting surface and the optical axis is not limited to 45 degrees, but may be other angles depending on spatial configuration and other requirements. A reflective element can redirect light from the optical axis near the object side to the optical axis near the image side. The angle between the optical axis vector near the object side and the optical axis vector near the image side can be any angle, not limited to 0, 90, or 180 degrees. Furthermore, to reduce space requirements, the length and width of the mirror can be unequal, and the length, width, and height of the prism can also be unequal. The surface shape of the reflective element (e.g., the surface shape of the prism or mirror) can be planar, spherical, aspherical, or freeform, depending on optical design requirements, but this disclosure is not limited to these. A reflective element can be composed of one or more prisms, depending on design requirements. The prism can be made of materials such as glass or plastic, depending on design requirements. Furthermore, prisms with optical path reversal functions and prisms with light convergence or divergence functions are not counted in the lens. In other words, the lens of an imaging optical lens does not include prisms with optical path reversal functions and prisms with light convergence or divergence functions.

[0083] For further explanation, please refer to Figures 42 to 44, which are schematic diagrams illustrating one configuration of a reflective element in an imaging optical lens according to the present disclosure. As shown in Figures 42 to 44, the imaging optical lens may sequentially include a reflective element LF, a lens group LG, a filter element FT, and an imaging plane IMG along the optical path from the object side to the image side.

[0084] In Figure 42, the reflective element LF is a prism, which has a first transmitting surface LP1, a reflecting surface RF1, and a second transmitting surface LP2 sequentially along the optical path. The optical path passes through the first transmitting surface LP1 along the first optical axis OA1 to the reflecting surface RF1. The reflecting surface RF1 turns the optical path from the first optical axis OA1 to the second optical axis OA2. The optical path then passes through the second transmitting surface LP2 along the second optical axis OA2, passes through the lens group LG and the filter element FT, and finally reaches the imaging surface IMG. As shown in Figure 42, both the first transmitting surface LP1 and the second transmitting surface LP2 of the reflective element LF can be planar.

[0085] In Figure 43, the reflecting element LF is a plane mirror with a reflecting surface RF1. The light path is along the first optical axis OA1 to the reflecting surface RF1, and the reflecting surface RF1 turns the light path from the first optical axis OA1 to the second optical axis OA2. The light path passes through the lens group LG and the filter element FT along the second optical axis OA2 and arrives at the imaging surface IMG.

[0086] In Figure 44, the reflective element LF is a prism, which has a first penetrating surface LP1, a reflecting surface RF1, and a second penetrating surface LP2 sequentially along the optical path. The optical path passes through the first penetrating surface LP1 along the first optical axis OA1 to the reflecting surface RF1. The reflecting surface RF1 turns the optical path from the first optical axis OA1 to the second optical axis OA2. The optical path then passes through the second penetrating surface LP2 along the second optical axis OA2, and then passes through the lens group LG and the filter element FT to reach the imaging surface IMG. As shown in Figure 44, both the first penetrating surface LP1 and the second penetrating surface LP2 of the reflective element LF can be curved surfaces.

[0087] Furthermore, please refer to Figures 45 and 46, which respectively illustrate a configuration relationship of the two reflective elements according to the present disclosure in an imaging optical lens. As shown in Figures 45 and 46, the imaging optical lens may sequentially include a first reflective element LF1, a lens group LG, a filter element FT, a second reflective element LF2, and an imaging surface IMG along the optical path direction from the object side to the image side. The optical path reaches the first reflective surface RF1 of the first reflective element LF1 along the first optical axis OA1, and the first reflective surface RF1 deflects the optical path from the first optical axis OA1 to the second optical axis OA2. The optical path passes through the lens group LG and the filter element FT along the second optical axis OA2. Then, the optical path reaches the second reflective surface RF2 of the second reflective element LF2 along the second optical axis OA2, and the second reflective surface RF2 deflects the optical path from the second optical axis OA2 to the third optical axis OA3. The optical path reaches the imaging surface IMG along the third optical axis OA3. In Figure 45, both the first reflective element LF1 and the second reflective element LF2 may be prisms. In Figure 46, the first reflecting element LF1 and the second reflecting element LF2 can be a prism and a plane mirror, respectively.

[0088] Additionally, please refer to Figures 47 to 50, where Figure 47 illustrates a schematic diagram of the configuration of a dual-reflection element in an imaging optical lens according to the present disclosure, Figure 48 illustrates a schematic diagram of the configuration of a triple-reflection element in an imaging optical lens according to the present disclosure, Figure 49 illustrates a schematic diagram of the configuration of a quad-reflection element in an imaging optical lens according to the present disclosure, and Figure 50 illustrates a schematic diagram of the configuration of a five-reflection element in an imaging optical lens according to the present disclosure.

[0089] As shown in Figure 47, the imaging optical lens may sequentially include a lens group LG, a filter element FT, a reflective element LF, and an imaging surface IMG along the optical path from the object side to the image side. The reflective element LF may be a prism, which sequentially has a first transmission surface LP1, a first reflection surface RF1, a second reflection surface RF2, and a second transmission surface LP2 along the optical path. The optical path passes through the lens group LG, the filter element FT, and the first transmission surface LP1 along the first optical axis OA1 to the first reflection surface RF1. The first reflection surface RF1 deflects the optical path from the first optical axis OA1 to the second optical axis OA2. The second reflection surface RF2 deflects the optical path from the second optical axis OA2 to the third optical axis OA3, and the optical path passes through the second transmission surface LP2 along the third optical axis OA3 to the imaging surface IMG.

[0090] As shown in Figure 48, the imaging optical lens may sequentially include a lens group LG, a filter element FT, a reflective element LF, and an imaging surface IMG along the optical path from the object side to the image side. The reflective element LF may be a prism, which sequentially has a first transmission surface LP1, a first reflection surface RF1, a second reflection surface RF2, a third reflection surface RF3, and a second transmission surface LP2 along the optical path. The optical path passes through the lens group LG, the filter element FT, and the first transmission surface LP1 along the first optical axis OA1 to the first reflection surface RF1. The first reflection surface RF1 deflects the optical path from the first optical axis OA1 to the second optical axis OA2. The second reflection surface RF2 deflects the optical path from the second optical axis OA2 to the third optical axis OA3. The third reflection surface RF3 deflects the optical path from the third optical axis OA3 to the fourth optical axis OA4, and the optical path passes through the second transmission surface LP2 along the fourth optical axis OA4 to the imaging surface IMG. The first transmission surface LP1 and the second reflection surface RF2 may be on the same plane.

[0091] As shown in Figure 49, the imaging optical lens may sequentially include a lens group LG, a reflective element LF, a filter element FT, and an imaging surface IMG along the optical path from the object side to the image side. The reflective element LF may be a prism, which sequentially has a first transmission surface LP1, a first reflection surface RF1, a second reflection surface RF2, a third reflection surface RF3, a fourth reflection surface RF4, and a second transmission surface LP2 along the optical path. The optical path passes through the lens group LG and the first transmission surface LP1 along the first optical axis OA1 to the first reflection surface RF1. The first reflection surface RF1 deflects the optical path from the first optical axis OA1 to the second optical axis OA2. The second reflection surface RF2 deflects the optical path from the second optical axis OA2 to the third optical axis OA3. The third reflection surface RF3 deflects the optical path from the third optical axis OA3 to the fourth optical axis OA4. The fourth reflection surface RF4 deflects the optical path from the fourth optical axis OA4 to the fifth optical axis OA5. The optical path then passes through the second transmission surface LP2 and the filter element FT along the fifth optical axis OA5 to the imaging surface IMG. The first penetrating surface LP1 and the second reflecting surface RF2 can be the same plane.

[0092] As shown in Figure 50, the imaging optical lens may include, in sequence from the object side to the image side along the optical path direction, a lens group LG, a reflecting element LF, a filter element FT, and an imaging surface IMG. The reflecting element LF may be a prism, which has, in sequence along the optical path direction, a first transmitting surface LP1, a first reflecting surface RF1, a second reflecting surface RF2, a third reflecting surface RF3, a fourth reflecting surface RF4, a fifth reflecting surface RF5, and a second transmitting surface LP2. The optical path follows the first optical axis OA1, passes through the lens group LG and the first transmission surface LP1, and arrives at the first reflecting surface RF1. The first reflecting surface RF1 deflects the optical path along the first optical axis OA1 to the second optical axis OA2. The second reflecting surface RF2 deflects the optical path along the second optical axis OA2 to the third optical axis OA3. The third reflecting surface RF3 deflects the optical path along the third optical axis OA3 to the fourth optical axis OA4. The fourth reflecting surface RF4 deflects the optical path along the fourth optical axis OA4 to the fifth optical axis OA5. The fifth reflecting surface RF5 deflects the optical path along the fifth optical axis OA5 to the sixth optical axis OA6. The optical path then follows the sixth optical axis OA6, passes through the second transmission surface LP2 and the filter element FT, and arrives at the imaging surface IMG. The first transmission surface LP1 and the second reflecting surface RF2 can be on the same plane.

[0093] Furthermore, please refer to Figures 51 and 52, where Figure 51 illustrates a schematic diagram of the configuration of a reflective element in an imaging optical lens according to the present disclosure, and Figure 52 illustrates a schematic diagram of the configuration of another reflective element in an imaging optical lens according to the present disclosure. As shown in Figures 51 and 52, the imaging optical lens may sequentially include a lens group LG, a reflective element LF, a filter element FT, and an imaging surface IMG along the optical path from the object side to the image side. The reflective element LF may be a pentaprism, which sequentially has a first penetrating surface LP1, a first reflecting surface RF1, a second reflecting surface RF2, and a second penetrating surface LP2 along the optical path. The optical path follows the first optical axis OA1, passes through the first transmission surface LP1, and reaches the first reflection surface RF1. The first reflection surface RF1 deflects the optical path along the first optical axis OA1 to the second optical axis OA2. The second reflection surface RF2 deflects the optical path along the second optical axis OA2 to the third optical axis OA3. The optical path then follows the third optical axis OA3, passes through the second transmission surface LP2 and the filter element FT, and reaches the imaging surface IMG. In Figure 51, both the first transmission surface LP1 and the second transmission surface LP2 can be planar. In Figure 52, both the first transmission surface LP1 and the second transmission surface LP2 can be curved surfaces. Furthermore, as shown in Figures 51 and 52, the first optical axis OA1 and the third optical axis OA3 can, for example, intersect each other and be perpendicular.

[0094] Furthermore, to reduce the occupied volume, the length and width of the reflector can be unequal, and the length, width, and height of the prism can also be unequal. Chamfers or grooves can be designed in the non-optically effective diameter area to reduce weight, reduce volume, and accommodate the internal components of the electronic device. Additionally, a light-absorbing coating can be applied to the surface of the groove to achieve anti-reflection and stray light blocking effects. Please refer to Figures 60 to 62, where Figure 60 illustrates a schematic diagram of one embodiment of the reflective element according to the first embodiment of this disclosure, Figure 61 illustrates a perspective view of the reflective element of Figure 60 before the formation of chamfers and grooves, and Figure 62 illustrates a perspective view of the reflective element of Figure 60 with chamfers and grooves formed. As shown in Figures 60 and 61, the reflective element E6 has a non-optical effective path region NPR, meaning that the imaging light rays will not pass through the non-optical effective path region NPR in the reflective element E6. Therefore, in the design, part of the non-optical effective path region NPR of the reflective element E6 in Figures 60 and 61 can be removed, so that the reflective element E6 is formed with a tangent edge CP and a groove RP (as shown in Figure 62).

[0095] The imaging optical lens disclosed in this disclosure may also be selectively configured with more than three reflective elements. Therefore, this disclosure is not limited to the type, number and position of the reflective elements disclosed in the figures.

[0096] The imaging optical lens disclosed herein may be provided with at least one aperture stop, which may be located in front of the first lens, between the lenses, or after the last lens. The aperture stop may be of the type such as a glare stop or a field stop, which can be used to reduce stray light and help improve image quality.

[0097] In the imaging optical lens disclosed in this invention, the aperture can be configured as a front aperture or a center aperture. A front aperture means the aperture is positioned between the subject and the first lens, while a center aperture means the aperture is positioned between the first lens and the imaging plane. A front aperture allows for a longer distance between the exit pupil and the imaging plane, resulting in a telecentric effect and increasing the efficiency of image reception by the CCD or CMOS sensor. A center aperture helps to expand the field of view of the imaging optical lens.

[0098] This disclosure may appropriately incorporate a variable aperture element, which can be a mechanical component or a light-regulating element, capable of electrically or signal-controlled aperture size and shape. The mechanical component may include movable parts such as blade assemblies or shielding plates; the light-regulating element may include masking materials such as filter elements, electrochromic materials, or liquid crystal layers. The variable aperture element can enhance image adjustment capabilities by controlling the amount of light entering the image or the exposure time. Furthermore, the variable aperture element can also be the aperture of this disclosure, allowing adjustment of image quality, such as depth of field or exposure speed, by changing the aperture value.

[0099] This disclosure allows for the appropriate placement of one or more optical elements to restrict the form of light passing through an imaging optical lens. These optical elements may be filters, polarizers, etc., but this disclosure is not limited thereto. Furthermore, the optical elements may be monolithic elements, composite components, or thin films, but this disclosure is not limited thereto. The optical elements can be placed between the object end, image end, or lens of the imaging optical lens to control the passage of specific forms of light, thereby meeting application requirements.

[0100] The imaging optical lens disclosed herein may include at least one optical lens, optical element, or carrier, at least one surface of which has a low-reflection layer, which can effectively reduce stray light generated by light reflection at the interface. The low-reflection layer may be disposed in the ineffective area of ​​the object-side surface or image-side surface of the optical lens, or on the connecting surface between the object-side surface and the image-side surface; the optical element may be a light-shielding element, an annular spacer element, a lens barrel element, a cover glass, blue glass, a filter element (color filter), a light path deflection element (reflective element), a prism, or a mirror, etc.; the carrier may be a lens mount, a microlens disposed on the photosensitive element, the periphery of the photosensitive element substrate, or a glass sheet used to protect the photosensitive element, etc.

[0101] In the imaging optical lens disclosed herein, the object side and image side are determined according to the optical axis direction, and the data on the optical axis are calculated along the optical axis. Furthermore, if the optical axis is turned by a reflective element, the data on the optical axis are also calculated along the optical axis.

[0102] Based on the above implementation methods, specific embodiments are presented below and described in detail with reference to the accompanying drawings.

[0103] <First Embodiment>

[0104] Please refer to Figures 1 to 3, where Figure 1 shows schematic diagrams of the imaging device according to the first embodiment of this disclosure in a first state and a second state, Figure 2 shows, from left to right, the spherical aberration, astigmatism, and distortion curves of the imaging device of the first embodiment in the first state, and Figure 3 shows, from left to right, the spherical aberration, astigmatism, and distortion curves of the imaging device of the first embodiment in the second state. The upper half of Figure 1 is a schematic diagram of the imaging optical lens in the first state, and the lower half of Figure 1 is a schematic diagram of the imaging optical lens in the second state. As shown in Figure 1, the imaging device 1 includes an imaging optical lens (not otherwise labeled) and an electronic photosensitive element IS. The imaging optical lens, along the optical path direction from the object side to the image side, includes, in sequence, an aperture stop S1, a first lens E1, an aperture stop S2, a second lens E2, a third lens E3, a fourth lens E4, an aperture stop S3, a fifth lens E5, an aperture stop S4, a reflective element E6, a filter element E7, and an imaging surface IMG. Furthermore, the imaging optical lens, along the optical path direction from the object side to the image side, has a moving lens group G1 and a final lens group G2 in sequence. The moving lens group G1 includes an aperture stop S1, a first lens E1, an aperture stop S2, a second lens E2, a third lens E3, a fourth lens E4, and an aperture stop S3. The final lens group G2 includes a fifth lens E5 and an aperture stop S4. The electronic photosensitive element IS is disposed on the imaging plane IMG. The imaging optical lens comprises five lenses (E1, E2, E3, E4, E5), and there are no other interposed lenses between each lens. Additionally, there are no other lenses on the optical axis between the final lens group G2 and the reflecting element E6.

[0105] The imaging optical lens adjusts its focal length by changing the distance between two lens groups (G1, G2) during the focusing process. When the subject is at infinity, the imaging optical lens is in the first state shown in the upper part of Figure 1. When the subject is at a finite distance, the imaging optical lens is in the second state, for example, shown in the lower part of Figure 1. Specifically, when the subject moves from infinity to a finite distance, the imaging optical lens performs a focusing process to change from the first state to the second state. Conversely, when the subject moves from a finite distance to infinity, the imaging optical lens also performs a focusing process to change from the second state to the first state. The first state refers to the state of the imaging optical lens when the subject is at infinity; the second state refers to the state of the imaging optical lens when the subject is at a finite distance. As shown in Figure 1, the moving lens group G1 moves relative to the final lens group G2 along the optical axis during the focusing process. In this process, during the focusing motion of the imaging optical lens from its first state to its second state, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side. It should be noted that the elements in the moving lens group G1 (e.g., lenses, aperture stops, and / or diaphragms) do not move relative to each other during the focusing motion, and the elements in the final lens group G2 (e.g., lenses, aperture stops, and / or diaphragms) also do not move relative to each other during the focusing motion. Furthermore, during the focusing motion, the final lens group G2 does not move relative to the reflecting element E6.

[0106] The first lens E1 has positive refractive power and is made of glass. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are spherical.

[0107] The second lens E2 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has three inflection points, and its image-side surface has two inflection points. Its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0108] The third lens E3 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has three inflection points, its image-side surface has three inflection points, and its image-side surface has a critical point off-axis.

[0109] The fourth lens E4 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has two inflection points, and its image-side surface has one inflection point. Its object-side surface has two critical points off-axis, and its image-side surface has one critical point off-axis.

[0110] The fifth lens E5 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both surfaces are aspherical. Its object-side surface has a point of inflection, its image-side surface has a point of inflection, and its image-side surface has a critical point off-axis.

[0111] The reflective element E6 is made of glass and is positioned between the fifth lens E5 and the imaging surface IMG along the optical axis, without affecting the focal length of the imaging lens. The reflective element E6 is a prism with a light path deflection function. For ease of explanation, Figure 1 does not show the deflection effect of the reflective element E6 on the light path. However, the reflective element E6 can have various forms depending on actual design requirements, thus creating different deflection effects on the light path. For example, please refer to Figures 53 to 58, which are schematic diagrams illustrating the light path deflection in the first state of the imaging device according to the first embodiment of this disclosure, with the configuration of various reflective elements.

[0112] In Figures 53 to 55, the reflective element E6 sequentially comprises a first penetrating surface LP1, a first reflecting surface RF1, a second reflecting surface RF2, and a second penetrating surface LP2 along the optical path direction. The first reflecting surface RF1 deflects the optical path from the first optical axis OA1 to the second optical axis OA2, and the second reflecting surface RF2 deflects the optical path from the second optical axis OA2 to the third optical axis OA3, with the optical path reaching the imaging surface IMG along the third optical axis OA3. In Figures 53 to 55, the reflective element E6 deflects the optical path twice. In Figure 53, the first penetrating surface LP1 and the second penetrating surface LP2 are located on the same plane. The angle between the normal direction of the first reflecting surface RF1 and the first optical axis OA1 and the second optical axis OA2 can both be 45.0 degrees. The angle between the normal direction of the second reflecting surface RF2 and the second optical axis OA2 and the third optical axis OA3 can both be 45.0 degrees. This makes the angle between the optical axis vector (first optical axis OA1) at the near object end and the optical axis vector (third optical axis OA3) at the near image end 180 degrees. The optical axis vector at the near object end and the optical axis vector at the near image end can be opposite. In Figure 54, the first penetrating surface LP1 and the second penetrating surface LP2 are parallel to each other and not coplanar. The angle between the normal direction of the first reflecting surface RF1 and the first optical axis OA1 and the second optical axis OA2 can both be 42.0 degrees, and the angle between the normal direction of the second reflecting surface RF2 and the second optical axis OA2 and the third optical axis OA3 can both be 48.0 degrees. This makes the angle between the optical axis vector (first optical axis OA1) at the near object end and the optical axis vector (third optical axis OA3) at the near image end 180 degrees, where the optical axis vector at the near object end and the optical axis vector at the near image end can be opposite. In Figure 55, the first penetrating surface LP1 and the second penetrating surface LP2 are not parallel to each other and are not coplanar. The angle between the normal direction of the first reflecting surface RF1 and the first optical axis OA1 and the second optical axis OA2 can both be 47.0 degrees, and the angle between the normal direction of the second reflecting surface RF2 and the second optical axis OA2 and the third optical axis OA3 can both be 55.6 degrees. This results in an obtuse angle between the optical axis vector near the object end (first optical axis OA1) and the optical axis vector near the image end (third optical axis OA3).

[0113] In Figures 56 and 57, the reflective element E6 sequentially comprises a first penetrating surface LP1, a first reflecting surface RF1, a second reflecting surface RF2, a third reflecting surface RF3, and a second penetrating surface LP2 along the optical path direction. The first reflecting surface RF1 deflects the optical path from the first optical axis OA1 to the second optical axis OA2, the second reflecting surface RF2 deflects the optical path from the second optical axis OA2 to the third optical axis OA3, and the third reflecting surface RF3 deflects the optical path from the third optical axis OA3 to the fourth optical axis OA4. The optical path then reaches the imaging plane IMG along the fourth optical axis OA4. In Figures 56 and 57, the reflective element E6 deflects the optical path three times. In Figure 56, the first penetrating surface LP1, the second reflecting surface RF2, and the second penetrating surface LP2 are all located on the same plane. The angle between the normal direction of the first reflecting surface RF1 and the first optical axis OA1 and the second optical axis OA2 can both be 30.0 degrees. The angle between the normal direction of the second reflecting surface RF2 and the second optical axis OA2 and the third optical axis OA3 can both be 60.0 degrees. The angle between the normal direction of the third reflecting surface RF3 and the third optical axis OA3 and the fourth optical axis OA4 can both be 30.0 degrees. Thus, the angle between the optical axis vector at the near object end (first optical axis OA1) and the optical axis vector at the near image end (fourth optical axis OA4) can be 180 degrees. The optical axis vector at the near object end and the optical axis vector at the near image end can be opposite. In Figure 57, the first penetrating surface LP1 and the second reflecting surface RF2 are not parallel to each other and are not coplanar. The angle between the normal direction of the first reflecting surface RF1 and the first optical axis OA1 and the second optical axis OA2 can both be 40.0 degrees. The angle between the normal direction of the second reflecting surface RF2 and the second optical axis OA2 and the third optical axis OA3 can both be 55.0 degrees. The angle between the normal direction of the third reflecting surface RF3 and the third optical axis OA3 and the fourth optical axis OA4 can both be 27.5 degrees. This results in an obtuse angle between the optical axis vector near the object end (first optical axis OA1) and the optical axis vector near the image end (fourth optical axis OA4).

[0114] In Figure 58, the reflective element E6 has, in sequence along the optical path direction, a first penetrating surface LP1, a first reflecting surface RF1, a second reflecting surface RF2, a third reflecting surface RF3, a fourth reflecting surface RF4, and a second penetrating surface LP2. The first reflecting surface RF1 deflects the optical path from the first optical axis OA1 to the second optical axis OA2, the second reflecting surface RF2 deflects the optical path from the second optical axis OA2 to the third optical axis OA3, the third reflecting surface RF3 deflects the optical path from the third optical axis OA3 to the fourth optical axis OA4, and the fourth reflecting surface RF4 deflects the optical path from the fourth optical axis OA4 to the fifth optical axis OA5. The optical path then reaches the imaging surface IMG along the fifth optical axis OA5. In Figure 58, the reflective element E6 bends the optical path four times. The angle between the normal direction of the first reflective surface RF1 and the first optical axis OA1 and the second optical axis OA2 can both be 28.0 degrees. The angle between the normal direction of the second reflective surface RF2 and the second optical axis OA2 and the third optical axis OA3 can both be 56.0 degrees. The angle between the normal direction of the third reflective surface RF3 and the third optical axis OA3 and the fourth optical axis OA4 can both be 56.0 degrees. The angle between the normal direction of the fourth reflective surface RF4 and the fourth optical axis OA4 and the fifth optical axis OA5 can both be 28.0 degrees. This makes the angle between the optical axis vector near the object end (first optical axis OA1) and the optical axis vector near the image end (fifth optical axis OA5) 0 degrees. The optical axis vectors near the object end and near the image end can be in the same direction.

[0115] Furthermore, the reflective element E6 in this embodiment may also have a structure similar to that in FIG50, and the light path may be deflected five times. Please refer to the description corresponding to FIG50 above, which will not be repeated here.

[0116] The filter element E7 is made of plastic and is located between the reflective element E6 and the imaging surface IMG. It does not affect the focal length of the imaging optical lens.

[0117] The equations for the aspherical surfaces of the above lenses are expressed as follows:

[0118] X: The displacement parallel to the optical axis from the intersection of the aspherical surface and the optical axis to a point on the aspherical surface at a distance Y from the optical axis;

[0119] Y: The perpendicular distance between a point on the aspherical curve and the optical axis;

[0120] R: Radius of curvature;

[0121] k: cone coefficient; and

[0122] Ai: The i-th order aspherical coefficient.

[0123] In the imaging optical lens of the first embodiment, the first lens E1 is the lens closest to the object side, and the fifth lens E5 is the lens closest to the image side.

[0124] The object distance is the distance on the optical axis between the subject and the object-side surface of the lens closest to the object side in the imaging optical lens (i.e., the object-side surface of the first lens E1). In this embodiment, the imaging optical lens is in the second state with the subject located at a finite object distance of 114.281 mm as an example, but this disclosure is not limited to this.

[0125] The focal length of the imaging optical lens in the first state is fL, the aperture value of the imaging optical lens in the first state is FnoL, and half of the maximum angle of view of the imaging optical lens in the first state is HFOVL, with the following values: fL = 13.72 mm, FnoL = 2.26, HFOVL = 14.5 degrees (deg.).

[0126] The focal length of the imaging optical lens in the second state is fS, the aperture value of the imaging optical lens in the second state is FnoS, and half of the maximum angle of view of the imaging optical lens in the second state is HFOVS. The values ​​are as follows: fS = 12.91 mm, FnoS = 2.51, HFOVS = 13.0 degrees.

[0127] The distance on the optical axis between the subject and the aperture S1 is D0, and the distance on the optical axis between the image-side surface of the moving lens group G1 and the object-side surface of the last lens group G2 is D1. In this embodiment, D1 is the distance on the optical axis between the aperture S3 and the object-side surface of the fifth lens E5. When the imaging optical lens is in the first state and the second state through the focusing process, the values ​​of object distance, D0, and D1 will be different. When the imaging optical lens is in the first state, it satisfies the following conditions: object distance = ∞ (infinity); D0 = ∞ (infinity); and D1 = 0.984 mm. When the imaging optical lens is in the second state, it satisfies the following conditions: object distance = 114.281 mm; D0 = 114.251 mm; and D1 = 1.733 mm.

[0128] The maximum field of view of the imaging optical lens in the first state is FOVL, which satisfies the following condition: FOVL = 29.0 degrees.

[0129] The maximum angle of view of the imaging optical lens in the second state is FOVS, which satisfies the following condition: FOVS = 26.0 degrees.

[0130] In the second state, the distance from the object-side surface of the lens closest to the object side of the imaging optical lens to the imaging plane IMG along the optical axis is TLS. In the first state, the distance from the object-side surface of the lens closest to the object side of the imaging optical lens to the imaging plane IMG along the optical axis is TLL, which satisfies the following condition: TLS / TLL = 1.039. In this embodiment, TLS is the distance from the object-side surface of the first lens E1 to the imaging plane IMG along the optical axis in the second state, and TLL is the distance from the object-side surface of the first lens E1 to the imaging plane IMG along the optical axis in the first state.

[0131] The focal length of the imaging optical lens in the first state is fL, and the focal length of the moving lens group G1 is fG1, which satisfies the following condition: fL / fG1 = 1.51.

[0132] In the second state of the imaging optical lens, the distance on the optical axis from the object-side surface of the lens closest to the object side to the image-side surface of the lens closest to the image side is TDS. In the first state of the imaging optical lens, the distance on the optical axis from the object-side surface of the lens closest to the object side to the image-side surface of the lens closest to the image side is TDL, which satisfies the following condition: |TDS-TDL| = 0.75 mm. In this embodiment, TDS is the distance on the optical axis from the object-side surface of the first lens E1 to the image-side surface of the fifth lens E5 in the second state of the imaging optical lens, and TDL is the distance on the optical axis from the object-side surface of the first lens E1 to the image-side surface of the fifth lens E5 in the first state of the imaging optical lens.

[0133] In the second state, the distance on the optical axis between the object-side surface of the lens closest to the object side and the image-side surface of the lens closest to the image side is TDS. In the first state, the distance on the optical axis between the object-side surface of the lens closest to the object side and the image-side surface of the lens closest to the image side is TDL. The following condition is satisfied: 10×|TDS-TDL| / TDL = 1.60.

[0134] The distance on the optical axis from the object-side surface of the lens closest to the object side in the moving lens group G1 to the image-side surface of the lens closest to the image side in the moving lens group G1 is DG1. Similarly, the distance on the optical axis from the object-side surface of the lens closest to the object side in the final lens group G2 to the image-side surface of the lens closest to the image side in the final lens group G2 is DG2. This distance satisfies the condition that DG2 / DG1 = 0.14. In this embodiment, DG1 is the distance on the optical axis from the object-side surface of the first lens E1 to the image-side surface of the fourth lens E4, and DG2 is the distance on the optical axis from the object-side surface of the fifth lens E5 to the image-side surface of the fifth lens E5.

[0135] In the first state, the distance from the object-side surface of the lens closest to the object side of the imaging optical lens to the imaging plane IMG on the optical axis is TLL, and the focal length of the imaging optical lens in the first state is fL, which satisfies the following condition: TLL / fL = 1.42.

[0136] In the first state, the distance on the optical axis from the image-side surface of the lens closest to the image side to the imaging plane IMG of the imaging optical lens is BLL. The distance on the optical axis from the object-side surface of the lens closest to the object side to the image-side surface of the lens closest to the image side of the imaging optical lens is TDL, which satisfies the following condition: BLL / TDL = 3.14. In this embodiment, BLL is the distance on the optical axis from the image-side surface of the fifth lens E5 to the imaging plane IMG of the imaging optical lens in the first state.

[0137] In the first state, the distance from the aperture to the image-side surface of the lens closest to the image side of the imaging optical lens on the optical axis is SDL. In the first state, the distance from the object-side surface of the lens closest to the object side to the image-side surface of the lens closest to the image side of the imaging optical lens on the optical axis is TDL, which satisfies the following condition: SDL / TDL = 1.01. In this embodiment, SDL is the distance from the aperture to the image-side surface of the fifth lens E5 on the optical axis in the first state.

[0138] The focal length of the imaging optical lens in the first state is fL, and the focal length of the third lens E3 is f3, which satisfies the following condition: fL / f3 = -1.48.

[0139] In the first state, the optical lens for imaging has a distance T34L between the third lens E3 and the fourth lens E4 on the optical axis, and a thickness CT2 on the optical axis for the second lens E2, which satisfies the following condition: T34L / CT2 = 0.48. In this embodiment, the distance between two adjacent lenses on the optical axis refers to the distance between two adjacent mirror surfaces of the two adjacent lenses on the optical axis.

[0140] The focal length of the imaging optical lens in the first state is fL, and the radius of curvature of the object-side surface of the third lens E3 is R5, which satisfies the following condition: fL / R5 = -5.94.

[0141] The focal length of the second lens E2 is f2, and the focal length of the third lens E3 is f3, which satisfies the following condition: |f3 / f2| = 0.06.

[0142] The radius of curvature of the object-side surface of the second lens E2 is R3, the radius of curvature of the image-side surface of the second lens E2 is R4, and the focal length of the imaging optical lens in the first state is fL, which satisfies the following condition: |R3 / fL|+|R4 / fL| = 0.85.

[0143] The radius of curvature of the object-side surface of the first lens E1 is R1, and the radius of curvature of the image-side surface of the second lens E2 is R4, which satisfies the following condition: (R1-R4) / (R1+R4) = 0.10.

[0144] The radius of curvature of the object-side surface of the first lens E1 is R1, and the radius of curvature of the object-side surface of the third lens E3 is R5, which satisfies the following condition: (R1-R5) / (R1+R5) = 2.04.

[0145] The thickness of the first lens E1 along the optical axis is CT1, and the thickness of the second lens E2 along the optical axis is CT2, which satisfies the following condition: CT1 / CT2 = 2.87.

[0146] The thickness of the first lens E1 on the optical axis is CT1. When the imaging optical lens is in the first state, the distance on the optical axis from the object-side surface of the second lens E2 to the image-side surface of the fourth lens E4 is Dr3r8L, which satisfies the following condition: CT1 / Dr3r8L = 0.53.

[0147] In the first state, the optical lens used for imaging has a distance of T23L between the second lens E2 and the third lens E3 on the optical axis, and a thickness of CT4 on the optical axis for the fourth lens E4, which satisfies the following condition: T23L / CT4 = 1.99.

[0148] When the imaging optical lens is in the first state, the distance between the fourth lens E4 and the fifth lens E5 on the optical axis is T45L, and the focal length of the imaging optical lens in the first state is fL, which satisfies the following condition: 10×T45L / fL = 0.56.

[0149] The thickness of the fifth lens E5 on the optical axis is CT5. When the imaging optical lens is in the first state, the distance between the fourth lens E4 and the fifth lens E5 on the optical axis is T45L, which satisfies the following condition: CT5 / T45L = 0.62.

[0150] The refractive index of the first lens E1 is N1, which satisfies the following condition: N1 = 1.883.

[0151] The Abbe number of the fifth lens E5 is V5, which satisfies the following condition: V5 = 19.5.

[0152] The Abbe number of the fifth lens E5 is V5, and the refractive index of the fifth lens E5 is N5, which satisfies the following condition: V5 / N5 = 11.68.

[0153] In the first state, the distance between the maximum effective radius of the image-side surface of the first lens E1 and the maximum effective radius of the object-side surface of the second lens E2, parallel to the optical axis, is ET12L. The thickness of the second lens E2 on the optical axis is CT2, which satisfies the following condition: ET12L / CT2 = 0.93.

[0154] In the first state, the displacement parallel to the optical axis from the intersection of the object-side surface of the second lens E2 with the optical axis to the position of the maximum effective radius of the object-side surface of the second lens E2 is Sag2R1L. The thickness of the second lens E2 on the optical axis is CT2, which satisfies the following condition: Sag2R1L / CT2 = 0.44. In this embodiment, the direction of Sag2R1L points towards the image side, so the value is positive.

[0155] When the imaging optical lens is in the first state, the maximum effective radius of the object-side surface of the first lens E1 is Y1R1L, and the maximum effective radius of the image-side surface of the fifth lens E5 is Y5R2L, which satisfies the following condition: Y1R1L / Y5R2L = 1.47.

[0156] When the imaging optical lens is in the first state, the maximum effective radius of the object-side surface of the first lens E1 is Y1R1L, and the maximum imaging height of the imaging optical lens is ImgH, which satisfies the following condition: Y1R1L / ImgH = 0.84.

[0157] Please refer to Tables 1A to 1C below.

[0158] Table 1A, First Embodiment surface radius of curvature thickness Material Refractive index Abbe number focal length 0 Subject flat D0 1 Aperture flat 0.030 2 First lens 6.7545 (SPH) 1.150 Glass 1.883 37.2 7.00 3 -66.6125 (SPH) 0.287 4 Aperture flat -0.156 5 Second lens 6.0728 (ASP) 0.401 plastic 1.545 56.1 -160.56 6 5.5464 (ASP) 0.797 7 Third lens -2.3098 (ASP) 0.374 plastic 1.669 19.5 -9.28 8 -3.9179 (ASP) 0.194 9 Fourth lens 16.4261 (ASP) 0.400 plastic 1.567 37.4 13.62 10 -14.4246 (ASP) -0.215 11 Aperture flat D1 12 Fifth lens -5.1113 (ASP) 0.479 plastic 1.669 19.5 -18.02 13 -9.2069 (ASP) -0.006 14 Aperture flat 0.406 15 Reflective element flat 13.500 Glass 1.835 42.7 - 16 flat 0.250 17 Filter element flat 0.210 plastic 1.517 64.2 - 18 flat 0.398 19 Imaging surface flat - The reference wavelength (d-line) is 587.6 nm. The effective radius of surface 1 (aperture S1) is 3.040 mm. The effective radius of surface 4 (aperture S2) is 2.773 mm. The effective radius of surface 11 (aperture S3) is 2.320 mm. The effective radius of surface 14 (aperture S4) is 2.074 mm. The imaging optical lens can further include an aperture, and the position of the aperture can be adjusted depending on the object distance. In this embodiment, when the imaging optical lens is in the first state (object distance at infinity), the aperture is located on surface 1. In this embodiment, when the imaging optical lens is in the second state (limited object distance), the aperture is located on surface 11.

[0159] Table 1A shows the detailed structural data of the first embodiment in Figure 1, where the units of radius of curvature, thickness and focal length are millimeters (mm), and surfaces 0 to 19 sequentially represent the surfaces from the object side to the image side along the optical path direction.

[0160] Table 1B: Parameters of the imaging optical lens in the first and second states, respectively. First state (object distance at infinity) Second state (finite object distance) fL [millimeters] 13.72 fS [millimeters] 12.91 FnoL 2.26 FnoS 2.51 HFOVL [degree] 14.5 HFOVS [degree] 13.0 Object distance [millimeters] ∞ Object distance [millimeters] 114.281 D0 [millimeters] ∞ D0 [millimeters] 114.251 D1 [millimeters] 0.984 D1 [millimeters] 1.733

[0161] Table 1B contains parameters for the imaging optical lens in the first and second states under different focusing conditions. It should be understood that this embodiment only discloses the above two moving focus states, but this disclosure is not limited to the states disclosed above, and the imaging optical lens in this embodiment may have other moving focus states with different focal lengths between the first and second states in addition to the first and second states, so as to correspond to other focusing states with different object distances.

[0162] As shown in Table 1B, the imaging optical lens performs a focusing process based on changes in object distance. During the focusing process as the imaging optical lens transitions from the first state to the second state, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side. Specifically, when the object distance changes from infinity to 114.281 mm, the imaging optical lens transitions from the first state to the second state. The distance D1 between the moving lens group G1 and the final lens group G2 along the optical axis increases from 0.984 mm in the first state to 1.733 mm in the second state. However, the final lens group G2 does not move relative to the reflecting element E6 during the focusing process. In other words, as the object distance decreases, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side during the focusing process.

[0163] Table 1C, Aspheric Coefficient surface 5 6 7 8 k = -8.878520000E-02 1.928610000E-01 -6.347110000E-01 -8.237730000E-02 A4 = -1.031175878E-02 -1.720608270E-02 4.145102059E-02 7.162815996E-03 A6 = 8.724675928E-03 1.636254330E-02 3.734201412E-02 6.872351074E-02 A8 = -1.059391330E-02 -1.931775484E-02 -6.707142718E-02 -9.347204645E-02 A10 = 8.733407892E-03 1.629157359E-02 5.829486861E-02 6.792082009E-02 A12 = -5.241039171E-03 -1.053128660E-02 -3.254042298E-02 -2.770479681E-02 A14 = 2.276332110E-03 5.173139571E-03 1.243480219E-02 4.296962473E-03 A16 = -7.105315760E-04 -1.889674012E-03 -3.299516228E-03 1.748158927E-03 A18 = 1.574902247E-04 5.034385227E-04 5.943005809E-04 -1.326018629E-03 A20 = -2.423938592E-05 -9.616886167E-05 -6.619390816E-05 4.288525593E-04 A22 = 2.478159001E-06 1.290450968E-05 2.875625629E-06 -8.601277490E-05 A24 = -1.521818670E-07 -1.177330832E-06 3.219494505E-07 1.135733954E-05 A26 = 4.001773605E-09 6.888717210E-08 -6.024392560E-08 -9.686016169E-07 A28 = 7.150044639E-11 -2.301945595E-09 3.903560954E-09 4.867492768E-08 A30 = -5.151389748E-12 3.275738998E-11 -9.694598095E-11 -1.099164464E-09 Surface 9 10 12 13 k = 9.934530000E-01 -4.970450000E+00 -9.618260000E+00 -2.434800000E+01 A4 = -5.245438159E-02 -1.579366939E-02 7.091546058E-03 1.056733510E-02 A6 = 4.885106137E-02 -1.869668843E-03 9.408068953E-04 7.422437772E-04 A8 = -4.497410923E-02 1.547100820E-02 -9.676571623E-04 -1.858986663E-03 A10 = 7.799875686E-03 -3.471106238E-02 -2.889297561E-04 2.294773370E-03 A12 = 2.561279434E-02 4.145825513E-02 1.787409000E-03 -1.842406627E-03 A14 = -2.996844635E-02 -3.086480623E-02 -2.195640252E-03 9.328632664E-04 A16 = 1.775062871E-02 1.554988762E-02 1.494333561E-03 -2.982583936E-04 A18 = -6.761369099E-03 -5.516246679E-03 -6.479566265E-04 5.805031718E-05 A20 = 1.766478022E-03 1.399939413E-03 1.865463674E-04 -5.852301659E-06 A22 = -3.216387120E-04 -2.536970661E-04 -3.564346171E-05 5.460160696E-08 A24 = 4.030004602E-05 3.215729283E-05 4.353352684E-06 4.575162142E-08 A26 = -3.323516515E-06 -2.715785750E-06 -3.080936816E-07 -3.104713544E-09 A28 = 1.628158470E-07 1.375852904E-07 9.619559604E-09 - A30 = -3.596251989E-09 -3.168430536E-09 - -

[0164] Table 1C shows the aspheric data in the first embodiment, where k is the taper coefficient in the aspheric curve equation, and A4 to A30 represent the 4th to 30th order aspheric coefficients of each surface. Furthermore, the tables for the following embodiments are schematic diagrams and aberration curves corresponding to each embodiment. The definitions of the data in the tables are the same as those in Tables 1A to 1C of the first embodiment, and will not be repeated here.

[0165] <Second Implementation Example>

[0166] Please refer to Figures 4 to 6. Figure 4 shows schematic diagrams of the imaging device according to the second embodiment of this disclosure in the first state and the second state, respectively. Figure 5, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the second embodiment in the first state, and Figure 6, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the second embodiment in the second state. The upper half of Figure 4 is a schematic diagram of the imaging optical lens in the first state, while the lower half of Figure 4 is a schematic diagram of the imaging optical lens in the second state. As shown in Figure 4, the imaging device 2 includes an imaging optical lens (not otherwise labeled) and an electronic photosensitive element IS. The imaging optical lens, along the optical path direction from the object side to the image side, includes, in sequence, an aperture stop S1, a first lens E1, an aperture stop S2, a second lens E2, a third lens E3, a fourth lens E4, an aperture stop S3, a fifth lens E5, an aperture stop S4, a reflective element E6, a filter element E7, and an imaging surface IMG. Furthermore, the imaging optical lens, along the optical path direction from the object side to the image side, has a moving lens group G1 and a final lens group G2 in sequence. The moving lens group G1 includes an aperture stop S1, a first lens E1, an aperture stop S2, a second lens E2, a third lens E3, a fourth lens E4, and an aperture stop S3. The final lens group G2 includes a fifth lens E5 and an aperture stop S4. The electronic photosensitive element IS is disposed on the imaging plane IMG. The imaging optical lens comprises five lenses (E1, E2, E3, E4, E5), and there are no other interposed lenses between each lens. Additionally, there are no other lenses on the optical axis between the final lens group G2 and the reflecting element E6.

[0167] The imaging optical lens adjusts its focal length by changing the distance between two lens groups (G1, G2) during the focusing process. When the subject is at infinity, the imaging optical lens is in the first state shown in the upper part of Figure 4. When the subject is at a finite distance, the imaging optical lens is in the second state, for example, shown in the lower part of Figure 4. Specifically, when the subject moves from infinity to a finite distance, the imaging optical lens performs a focusing process to change from the first state to the second state. Conversely, when the subject moves from a finite distance to infinity, the imaging optical lens also performs a focusing process to change from the second state to the first state. The first state refers to the state of the imaging optical lens when the subject is at infinity; the second state refers to the state of the imaging optical lens when the subject is at a finite distance. As shown in Figure 4, the moving lens group G1 moves relative to the final lens group G2 along the optical axis during the focusing process. In this process, during the focusing motion of the imaging optical lens from its first state to its second state, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side. It should be noted that the elements in the moving lens group G1 (e.g., lenses, aperture stops, and / or diaphragms) do not move relative to each other during the focusing motion, and the elements in the final lens group G2 (e.g., lenses, aperture stops, and / or diaphragms) also do not move relative to each other during the focusing motion. Furthermore, during the focusing motion, the final lens group G2 does not move relative to the reflecting element E6.

[0168] The first lens E1 has positive refractive power and is made of glass. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical, and its image-side surface has a point of inflection.

[0169] The second lens E2 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has one inflection point, its image-side surface has two inflection points, and its object-side surface has a critical point off-axis.

[0170] The third lens E3 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection, its image-side surface has a point of inflection, its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0171] The fourth lens E4 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has two inflection points, its image-side surface has one inflection point, and its object-side surface has two critical points off-axis.

[0172] The fifth lens E5 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both surfaces are aspherical. Its object-side surface has a point of inflection, its image-side surface has a point of inflection, its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0173] The reflective element E6 is made of glass and is positioned between the fifth lens E5 and the imaging plane IMG along the optical axis, without affecting the focal length of the imaging lens. The reflective element E6 is a prism with a light path reversal function. For ease of explanation, Figure 4 does not show the reversal effect of the reflective element E6 on the light path. However, the reflective element E6 can have various forms depending on actual design requirements, thus creating different reversal effects on the light path. In this embodiment, the reflective element E6 can, for example, have a structure similar to Figures 53 to 58, as described above with reference to the corresponding Figures 53 to 58, and will not be repeated here. Furthermore, the reflective element E6 in this embodiment can also, for example, have a structure similar to Figure 50, and can reversal the light path five times, as described above with reference to the corresponding Figure 50, and will not be repeated here.

[0174] The filter element E7 is made of plastic and is located between the reflective element E6 and the imaging surface IMG. It does not affect the focal length of the imaging optical lens.

[0175] Please refer to Tables 2A to 2D below.

[0176] Table 2A, Second Embodiment surface radius of curvature thickness Material Refractive index Abbe number focal length 0 Subject flat D0 1 Aperture flat 0.030 2 First lens 19.2224 (ASP) 0.997 Glass 1.954 32.3 6.42 3 -8.7505 (ASP) 0.444 4 Aperture flat -0.404 5 Second lens 3.9614 (ASP) 0.636 plastic 1.544 56.0 -41.22 6 3.1762 (ASP) 0.598 7 Third lens -2.9536 (ASP) 0.349 plastic 1.660 20.4 -6.18 8 -11.1929 (ASP) 0.407 9 Fourth lens 9.2997 (ASP) 0.647 plastic 1.544 56.0 9.32 10 -10.8835 (ASP) -0.237 11 Aperture flat D1 12 Fifth lens -5.2488 (ASP) 0.240 plastic 1.686 18.4 -34.02 13 -6.8976 (ASP) -0.051 14 Aperture flat 0.401 15 Reflective element flat 13.000 Glass 1.835 42.7 - 16 flat 0.300 17 Filter element flat 0.210 plastic 1.517 64.2 - 18 flat 0.414 19 Imaging surface flat - The reference wavelength (d-line) is 587.6 nm. The effective radius of surface 1 (aperture S1) is 2.815 mm. The effective radius of surface 4 (aperture S2) is 2.560 mm. The effective radius of surface 11 (aperture S3) is 2.220 mm. The effective radius of surface 14 (aperture S4) is 2.046 mm. The imaging optical lens can further include an aperture, and the position of the aperture can be adjusted depending on the object distance. In this embodiment, when the imaging optical lens is in the first state (object distance at infinity), the aperture is located on surface 1. In this embodiment, when the imaging optical lens is in the second state (limited object distance), the aperture is located on surface 4.

[0177] In this embodiment, the imaging optical lens is in the second state with the subject located at a finite object distance of 119.180 mm as an example, but this disclosure is not limited to this.

[0178] Table 2B: Parameters of the imaging optical lens in the first and second states, respectively. First state (object distance at infinity) Second state (finite object distance) fL [millimeters] 12.70 fS [millimeters] 12.31 FnoL 2.26 FnoS 2.50 HFOVL [degree] 15.7 HFOVS [degree] 14.4 Object distance [millimeters] ∞ Object distance [millimeters] 119.180 D0 [millimeters] ∞ D0 [millimeters] 119.150 D1 [millimeters] 1.048 D1 [millimeters] 1.898

[0179] The definitions described in Table 2B are the same as those in the first embodiment. It should be understood that this embodiment only discloses the above two moving focus states, but this disclosure is not limited to the states disclosed above, and the imaging optical lens of this embodiment may have other moving focus states with different focal lengths between the first state and the second state in addition to the first state and the second state, so as to correspond to other focusing states with different object distances.

[0180] As shown in Table 2B, the imaging optical lens performs a focusing process based on changes in object distance. During the focusing process as the imaging optical lens transitions from the first state to the second state, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side. Specifically, when the object distance changes from infinity to 119.180 mm, the imaging optical lens transitions from the first state to the second state. The distance D1 between the moving lens group G1 and the final lens group G2 along the optical axis increases from 1.048 mm in the first state to 1.898 mm in the second state. However, the final lens group G2 does not move relative to the reflecting element E6 during the focusing process. In other words, as the object distance decreases, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side during the focusing process.

[0181] Table 2C, Aspheric Coefficient surface 2 3 5 6 k = 8.605470000E-01 -3.457300000E+01 -7.438190000E-01 -9.666710000E-01 A4 = -7.248834493E-04 7.199996202E-05 3.399690516E-03 -8.889860585E-03 A6 = 7.731312862E-04 -1.209027285E-04 -1.045713334E-02 -2.322938938E-03 A8 = -3.182500881E-04 -4.131654970E-05 1.715476287E-02 3.424229163E-02 A10 = 5.530850417E-05 9.470980602E-06 -2.291717523E-02 -7.288778152E-02 A12 = -4.294125735E-06 1.035052321E-06 1.851980798E-02 7.297246931E-02 A14 = 1.237530185E-07 -2.839934758E-07 -9.716454717E-03 -4.444309907E-02 A16 = 3.110308404E-10 1.431960412E-08 3.497411516E-03 1.818881924E-02 A18 = - - -8.874081279E-04 -5.243008127E-03 A20 = - - 1.597058744E-04 1.087805919E-03 A22 = - - -2.012706034E-05 -1.630901291E-04 A24 = - - 1.713628781E-06 1.740663367E-05 A26 = - - -9.159606605E-08 -1.265844490E-06 A28 = - - 2.632933670E-09 5.661383967E-08 A30 = - - -2.671690136E-11 -1.179099065E-09 Surface 7 8 9 10 k = -6.701910000E-01 1.681580000E+00 6.646010000E+00 3.282770000E-02 A4 = 1.496818664E-02 -5.756310242E-02 -1.268118360E-01 -5.626352125E-02 A6 = 1.725294542E-01 2.582160319E-01 1.988857039E-01 7.083057608E-02 A8 = -2.820029566E-01 -3.504270439E-01 -2.192991442E-01 -5.482230990E-02 A10 = 2.504008863E-01 2.636187969E-01 1.488887339E-01 5.626209262E-03 A12 = -1.445822082E-01 -1.056262800E-01 -5.233727883E-02 3.575077282E-02 A14 = 5.742190931E-02 5.078505601E-03 -3.889803962E-03 -4.313653958E-02 A16 = -1.585748667E-02 1.992038332E-02 1.531432748E-02 2.810127977E-02 A18 = 2.944981433E-03 -1.291465480E-02 -9.103620787E-03 -1.211369399E-02 A20 = -3.186648544E-04 4.536008703E-03 3.159510198E-03 3.647023084E-03 A22 = 5.003959367E-06 -1.035648055E-03 -7.275134379E-04 -7.745152896E-04 A24 = 4.201643435E-06 1.580842014E-04 1.129248801E-04 1.140236212E-04 A26 = -6.644420117E-07 -1.563768870E-05 -1.139707568E-05 -1.108513830E-05 A28 = 4.583429986E-08 9.087281664E-07 6.762147446E-07 6.400301299E-07 A30 = -1.272090185E-09 -2.357262944E-08 -1.789528936E-08 -1.661043702E-08 surface 12 13 k = -1.510090000E+01 -4.849910000E+01 A4 = -2.498168645E-02 -2.545188692E-02 A6 = 9.698874550E-02 9.762334286E-02 A8 = -1.861534170E-01 -1.997230568E-01 A10 = 2.610163255E-01 3.011606929E-01 A12 = -2.715886676E-01 -3.324958207E-01 A14 = 2.100733662E-01 2.690238006E-01 A16 = -1.206925538E-01 -1.599776808E-01 A18 = 5.132774092E-02 6.993426820E-02 A20 = -1.602819125E-02 -2.235274397E-02 A22 = 3.616651104E-03 5.149467337E-03 A24 = -5.725041614E-04 -8.310272018E-04 A26 = 6.021583929E-05 8.904083255E-05 A28 = -3.775134830E-06 -5.684474982E-06 A30 = 1.066739939E-07 1.635462326E-07

[0182] In the second embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in Table 2D below are the same as in the first embodiment and will not be repeated here.

[0183] Table 2D, Polynomial Data fL [millimeters] 12.70 fL / R5 -4.30 FnoL 2.26 |f3 / f2| 0.15 HFOVL [degree] 15.7 |R3 / fL|+|R4 / fL| 0.56 FOVL [degree] 31.4 (R1 - R4) / (R1 + R4) 0.72 fS [mm] 12.31 (R1 - R5) / (R1 + R5) 1.36 FnoS 2.50 CT1 / CT2 1.57 HFOVS [degrees] 14.4 CT1 / Dr3r8L 0.38 FOVS [degrees] 28.8 T23L / CT4 0.92 TLS / TLL 1.045 10×T45L / fL 0.64 fL / fG1 1.26 CT5 / T45L 0.30 |TDS - TDL| [mm] 0.85 N1 1.954 10×|TDS - TDL| / TDL 1.80 V5 18.4 DG2 / DG1 0.07 V5 / N5 10.91 TLL / fL 1.50 ET12L / CT2 1.20 BLL / TDL 3.02 Sag2R1L / CT2 0.68 SDL / TDL 1.01 Y1R1L / Y5R2L 1.37 fL / f3 -2.06 Y1R1L / ImgH 0.78 T34L / CT2 0.64 - -

[0184] <Third Embodiment>

[0185] Please refer to Figures 7 to 9, where Figure 7 shows schematic diagrams of the imaging device according to the third embodiment of this disclosure in the first state and the second state, Figure 8 shows, from left to right, the spherical aberration, astigmatism, and distortion curves of the imaging device of the third embodiment in the first state, and Figure 9 shows, from left to right, the spherical aberration, astigmatism, and distortion curves of the imaging device of the third embodiment in the second state. The upper half of Figure 7 is a schematic diagram of the imaging optical lens in the first state, and the lower half of Figure 7 is a schematic diagram of the imaging optical lens in the second state. As shown in Figure 7, the imaging device 3 includes an imaging optical lens (not otherwise labeled) and an electronic photosensitive element IS. The imaging optical lens, along the optical path direction from the object side to the image side, includes, in sequence, an aperture stop S1, a first lens E1, an aperture stop S2, a second lens E2, a third lens E3, a fourth lens E4, an aperture stop S3, a fifth lens E5, an aperture stop S4, a reflective element E6, a filter element E7, and an imaging surface IMG. Furthermore, the imaging optical lens, along the optical path direction from the object side to the image side, has a moving lens group G1 and a final lens group G2 in sequence. The moving lens group G1 includes an aperture stop S1, a first lens E1, an aperture stop S2, a second lens E2, a third lens E3, a fourth lens E4, and an aperture stop S3. The final lens group G2 includes a fifth lens E5 and an aperture stop S4. The electronic photosensitive element IS is disposed on the imaging plane IMG. The imaging optical lens comprises five lenses (E1, E2, E3, E4, E5), and there are no other interposed lenses between each lens. Additionally, there are no other lenses on the optical axis between the final lens group G2 and the reflecting element E6.

[0186] The imaging optical lens adjusts its focal length by changing the distance between two lens groups (G1, G2) during the focusing process. When the subject is at infinity, the imaging optical lens is in the first state shown in the upper part of Figure 7. When the subject is at a finite distance, the imaging optical lens is in the second state, for example, shown in the lower part of Figure 7. Specifically, when the subject moves from infinity to a finite distance, the imaging optical lens performs a focusing process to change from the first state to the second state. Conversely, when the subject moves from a finite distance to infinity, the imaging optical lens also performs a focusing process to change from the second state to the first state. The first state refers to the state of the imaging optical lens when the subject is at infinity; the second state refers to the state of the imaging optical lens when the subject is at a finite distance. As shown in Figure 7, the moving lens group G1 moves relative to the final lens group G2 along the optical axis during the focusing process. In this process, during the focusing motion of the imaging optical lens from its first state to its second state, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side. It should be noted that the elements in the moving lens group G1 (e.g., lenses, aperture stops, and / or diaphragms) do not move relative to each other during the focusing motion, and the elements in the final lens group G2 (e.g., lenses, aperture stops, and / or diaphragms) also do not move relative to each other during the focusing motion. Furthermore, during the focusing motion, the final lens group G2 does not move relative to the reflecting element E6.

[0187] The first lens E1 has positive refractive power and is made of glass. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical, and its image-side surface has a point of inflection.

[0188] The second lens E2 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both surfaces are aspherical. Its object-side surface has one inflection point, and its image-side surface has two inflection points.

[0189] The third lens E3 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has three inflection points, its image-side surface has two inflection points, and its image-side surface has a critical point off-axis.

[0190] The fourth lens E4 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has five inflection points, its image-side surface has one inflection point, and its object-side surface has a critical point off-axis.

[0191] The fifth lens, E5, has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical.

[0192] The reflective element E6 is made of glass and is positioned between the fifth lens E5 and the imaging plane IMG along the optical axis, without affecting the focal length of the imaging lens. The reflective element E6 is a prism with a light path reversal function. For ease of explanation, Figure 7 does not show the reversal effect of the reflective element E6 on the light path. However, the reflective element E6 can have various forms depending on actual design requirements, thus creating different reversal effects on the light path. In this embodiment, the reflective element E6 can, for example, have a structure similar to Figures 53 to 58, as described above with reference to the corresponding Figures 53 to 58, and will not be repeated here. Furthermore, the reflective element E6 in this embodiment can also, for example, have a structure similar to Figure 50, and can reversal the light path five times, as described above with reference to the corresponding Figure 50, and will not be repeated here.

[0193] The filter element E7 is made of plastic and is located between the reflective element E6 and the imaging surface IMG. It does not affect the focal length of the imaging optical lens.

[0194] Please refer to Tables 3A to 3D below.

[0195] Table 3A, Third Embodiment surface radius of curvature thickness Material Refractive index Abbe number focal length 0 Subject flat D0 1 Aperture flat -0.478 2 First lens 6.8046 (ASP) 0.830 Glass 1.883 39.2 7.11 3 -76.2079 (ASP) 0.340 4 Aperture flat -0.300 5 Second lens 5.2348 (ASP) 0.529 plastic 1.544 56.0 498.35 6 5.1478 (ASP) 0.756 7 Third lens -2.3016 (ASP) 0.510 plastic 1.639 23.5 -8.35 8 -4.3997 (ASP) 0.044 9 Fourth lens 8.0068 (ASP) 0.433 plastic 1.566 37.4 11.70 10 -37.5334 (ASP) -0.163 11 Aperture flat D1 12 Fifth lens 78.3923 (ASP) 0.260 plastic 1.669 19.5 -16.56 13 9.6965 (ASP) 0.255 14 Aperture flat 0.185 15 Reflective element flat 13.350 Glass 1.835 42.7 - 16 flat 0.300 17 Filter element flat 0.210 plastic 1.517 64.2 - 18 flat 0.260 19 Imaging surface flat - The reference wavelength (d-line) is 587.6 nm. The effective radius of surface 1 (aperture S1) is 2.632 mm. The effective radius of surface 4 (aperture S2) is 2.419 mm. The effective radius of surface 11 (aperture S3) is 2.063 mm. The effective radius of surface 14 (aperture S4) is 1.793 mm. The imaging optical lens can further include an aperture, and the position of the aperture can be adjusted depending on the object distance. In this embodiment, when the imaging optical lens is in the first state (object distance at infinity), the aperture is located on surface 1. In this embodiment, when the imaging optical lens is in the second state (limited object distance), the aperture is located on surface 4.

[0196] In this embodiment, the imaging optical lens is in the second state with the subject located at a finite object distance of 118.872 mm as an example, but this disclosure is not limited to this.

[0197] Table 3B: Parameters of the imaging optical lens in the first and second states, respectively. First state (object distance at infinity) Second state (finite object distance) fL [millimeters] 12.91 fS [millimeters] 12.19 FnoL 2.45 FnoS 2.67 HFOVL [degree] 14.2 HFOVS [degree] 13.1 Object distance [millimeters] ∞ Object distance [millimeters] 118.872 D0 [millimeters] ∞ D0 [millimeters] 119.350 D1 [millimeters] 0.685 D1 [millimeters] 1.335

[0198] The definitions described in Table 3B are the same as those in the first embodiment. It should be understood that this embodiment only discloses the above two moving focus states, but this disclosure is not limited to the states disclosed above, and the imaging optical lens of this embodiment may have other moving focus states with different focal lengths between the first state and the second state in addition to the first state and the second state, so as to correspond to other focusing states with different object distances.

[0199] As shown in Table 3B, the imaging optical lens performs a focusing process based on changes in object distance. During the focusing process as the imaging optical lens transitions from the first state to the second state, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side. Specifically, when the object distance changes from infinity to 118.872 mm, the imaging optical lens transitions from the first state to the second state. The distance D1 between the moving lens group G1 and the final lens group G2 along the optical axis increases from 0.685 mm in the first state to 1.335 mm in the second state. However, the final lens group G2 does not move relative to the reflecting element E6 during the focusing process. In other words, as the object distance decreases, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side during the focusing process.

[0200] Table 3C, Aspheric Coefficient surface 2 3 5 6 k = -5.317060000E-02 -9.942030000E+00 2.635000000E-03 5.454210000E-02 A4 = 5.917426869E-04 5.953631148E-03 2.883945559E-04 -1.460876233E-02 A6 = 8.290025526E-04 -8.195140608E-03 -1.090027164E-02 -2.018598484E-03 A8 = -1.134209776E-03 6.240415193E-03 -4.871579079E-04 4.821271649E-03 A10 = 6.534606717E-04 -3.004057287E-03 1.584737555E-02 -5.036564657E-03 A12 = -2.207697453E-04 9.271526125E-04 -2.007370738E-02 8.776211725E-03 A14 = 4.640677018E-05 -1.813040366E-04 1.409538943E-02 -1.228894331E-02 A16 = -5.977347907E-06 2.155888718E-05 -6.592613240E-03 1.090231913E-02 A18 = 4.303621684E-07 -1.415867311E-06 2.161176552E-03 -6.344943191E-03 A20 = -1.319446930E-08 3.930025817E-08 -5.006267590E-04 2.491960072E-03 A22 = - - 8.078187046E-05 -6.635544860E-04 A24 = - - -8.774371811E-06 1.177909999E-04 A26 = - - 6.017869249E-07 -1.332130278E-05 A28 = - - -2.296607890E-08 8.669674085E-07 A30 = - - 3.551825523E-10 -2.468781274E-08 Surface 7 8 9 10 k = -6.445920000E-01 -1.628180000E-02 -4.448040000E-01 9.776460000E+01 A4 = 5.910719057E-02 3.040802907E-02 -3.549985394E-02 -1.352341730E-02 A6 = -6.729221508E-03 9.104500434E-02 8.643058561E-02 -1.263417373E-02 A8 = -3.754058588E-04 -2.078061632E-01 -1.059882357E-01 1.221007304E-01 A10 = -3.522067892E-02 1.271881859E-01 -1.736636502E-01 -3.705393415E-01 A12 = 7.985815919E-02 1.059609808E-01 5.567695860E-01 5.699047758E-01 A14 = -8.545173843E-02 -2.415152553E-01 -6.513063998E-01 -5.351528157E-01 A16 = 5.595094118E-02 2.035687976E-01 4.489338579E-01 3.347965277E-01 A18 = -2.459663606E-02 -1.043432595E-01 -2.052258895E-01 -1.458998223E-01 A20 = 7.550794988E-03 3.611897327E-02 6.513388064E-02 4.519247158E-02 A22 = -1.633737202E-03 -8.690188175E-03 -1.453229184E-02 -9.962211061E-03 A24 = 2.451154835E-04 1.439899166E-03 2.248590471E-03 1.533534091E-03 A26 = -2.430519104E-05 -1.570105560E-04 -2.305093521E-04 -1.571068215E-04 A28 = 1.432232807E-06 1.014058783E-05 1.410052981E-05 9.640488677E-06 A30 = -3.793743882E-08 -2.934927360E-07 -3.896330311E-07 -2.682584151E-07 Surface 12 13 k = 9.900000000E+01 5.031110000E+00 A4 = 1.037773961E-02 1.138460421E-02 A6 = -1.021420713E-02 -1.151295574E-02 A8 = 6.370482968E-02 5.738027913E-02 A10 = -1.832736888E-01 -1.569426588E-01 A12 = 3.004166948E-01 2.590480301E-01 A14 = -3.188965098E-01 -2.844149070E-01 A16 = 2.329825409E-01 2.179636031E-01 A18 = -1.208058779E-01 -1.194083534E-01 A20 = 4.499929479E-02 4.713274459E-02 A22 = -1.199690382E-02 -1.331742855E-02 A24 = 2.239582122E-03 2.630207893E-03 A26 = -2.785818159E-04 -3.450953969E-04 A28 = 2.077097836E-05 2.703741840E-05 A30 = -7.029634203E-07 -9.575376210E-07

[0201] In the third embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in Table 3D below are the same as in the first embodiment and will not be repeated here.

[0202] Table 3D, Polynomial Data fL [millimeters] 12.91 fL / R5 -5.61 FnoL 2.45 |f3 / f2| 0.02 HFOVL [degree] 14.2 |R3 / fL|+|R4 / fL| 0.80 FOVL [degree] 28.4 (R1-R4) / (R1+R4) 0.14 fS [mm] 12.19 (R1-R5) / (R1+R5) 2.02 FnoS 2.67 CT1 / CT2 1.57 HFOVS [degrees] 13.1 CT1 / Dr3r8L 0.37 FOVS [degrees] 26.2 T23L / CT4 1.75 TLS / TLL 1.035 10×T45L / fL 0.40 fL / fG1 1.51 CT5 / T45L 0.50 |TDS-TDL| [mm] 0.65 N1 1.883 10×|TDS-TDL| / TDL 1.66 V5 19.5 DG2 / DG1 0.08 V5 / N5 11.68 TLL / fL 1.43 [[ID=8​​​​​​​​​​​​​0.88 Y1R1L / Y5R2L 1.47 fL / f3 -1.55 Y1R1L / ImgH 0.80 T34L / CT2 0.08 - -

[0203] <Fourth Embodiment>

[0204] Please refer to Figures 10 to 12. Figure 10 shows schematic diagrams of the imaging device according to the fourth embodiment of this disclosure in a first state and a second state, respectively. Figure 11, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the fourth embodiment in the first state, and Figure 12, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the fourth embodiment in the second state. The upper half of Figure 10 is a schematic diagram of the imaging optical lens in the first state, while the lower half of Figure 10 is a schematic diagram of the imaging optical lens in the second state. As shown in Figure 10, the imaging device 4 includes an imaging optical lens (not otherwise labeled) and an electronic photosensitive element IS. The imaging optical lens, along the optical path direction from the object side to the image side, includes, in sequence, an aperture stop S1, a first lens E1, an aperture stop S2, a second lens E2, a third lens E3, a fourth lens E4, an aperture stop S3, a fifth lens E5, an aperture stop S4, a reflective element E6, a filter element E7, and an imaging surface IMG. Furthermore, the imaging optical lens, along the optical path direction from the object side to the image side, has a moving lens group G1 and a final lens group G2 in sequence. The moving lens group G1 includes an aperture stop S1, a first lens E1, an aperture stop S2, a second lens E2, a third lens E3, a fourth lens E4, and an aperture stop S3. The final lens group G2 includes a fifth lens E5 and an aperture stop S4. The electronic photosensitive element IS is disposed on the imaging plane IMG. The imaging optical lens comprises five lenses (E1, E2, E3, E4, E5), and there are no other interposed lenses between each lens. Additionally, there are no other lenses on the optical axis between the final lens group G2 and the reflecting element E6.

[0205] The imaging optical lens adjusts its focal length by changing the distance between two lens groups (G1, G2) during the focusing process. When the subject is at infinity, the imaging optical lens is in the first state shown in the upper half of Figure 10. When the subject is at a finite distance, the imaging optical lens is in the second state, for example, shown in the lower half of Figure 10. Specifically, when the subject moves from infinity to a finite distance, the imaging optical lens performs a focusing process to change from the first state to the second state. Conversely, when the subject moves from a finite distance to infinity, the imaging optical lens also performs a focusing process to change from the second state to the first state. The first state refers to the state of the imaging optical lens when the subject is at infinity; the second state refers to the state of the imaging optical lens when the subject is at a finite distance. As shown in Figure 10, the moving lens group G1 moves relative to the final lens group G2 along the optical axis during the focusing process. In this process, during the focusing motion of the imaging optical lens from its first state to its second state, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side. It should be noted that the elements in the moving lens group G1 (e.g., lenses, aperture stops, and / or diaphragms) do not move relative to each other during the focusing motion, and the elements in the final lens group G2 (e.g., lenses, aperture stops, and / or diaphragms) also do not move relative to each other during the focusing motion. Furthermore, during the focusing motion, the final lens group G2 does not move relative to the reflecting element E6.

[0206] The first lens E1 has positive refractive power and is made of glass. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are spherical.

[0207] The second lens E2 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has one inflection point, and its image-side surface has two inflection points. Its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0208] The third lens E3 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has three inflection points, its image-side surface has three inflection points, and its image-side surface has a critical point off-axis.

[0209] The fourth lens E4 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has two inflection points, and its image-side surface has one inflection point. Its object-side surface has two critical points off-axis, and its image-side surface has one critical point off-axis.

[0210] The fifth lens E5 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both surfaces are aspherical, and its object-side surface has a point of inflection.

[0211] The reflective element E6 is made of glass and is positioned between the fifth lens E5 and the imaging plane IMG along the optical axis, without affecting the focal length of the imaging lens. The reflective element E6 is a prism with a light path reversal function. For ease of explanation, Figure 10 does not show the reversal effect of the reflective element E6 on the light path. However, the reflective element E6 can have various forms depending on actual design requirements, thus creating different reversal effects on the light path. In this embodiment, the reflective element E6 can, for example, have a structure similar to Figures 53 to 58, as described above with reference to the corresponding Figures 53 to 58, and will not be repeated here. Furthermore, the reflective element E6 in this embodiment can also, for example, have a structure similar to Figure 50, and can reversal the light path five times, as described above with reference to the corresponding Figure 50, and will not be repeated here.

[0212] The filter element E7 is made of plastic and is located between the reflective element E6 and the imaging surface IMG. It does not affect the focal length of the imaging optical lens.

[0213] Please refer to Tables 4A to 4D below.

[0214] Table 4A, Fourth Embodiment surface radius of curvature thickness Material Refractive index Abbe number focal length 0 Subject flat D0 1 Aperture flat 0.030 2 First lens 9.5007 (SPH) 0.848 Glass 1.954 32.3 8.64 3 -59.4117 (SPH) 0.445 4 Aperture flat -0.405 5 Second lens 4.4741 (ASP) 0.555 plastic 1.544 56.0 31.94 6 5.7619 (ASP) 0.761 7 Third lens -2.2395 (ASP) 0.516 plastic 1.614 26.0 -7.29 8 -4.8782 (ASP) 0.166 9 Fourth lens 9.6320 (ASP) 0.639 plastic 1.544 56.0 10.65 10 -14.2131 (ASP) -0.259 11 Aperture flat D1 12 Fifth lens 25.3444 (ASP) 0.260 plastic 1.660 20.4 -18.07 13 8.0756 (ASP) 0.368 14 Aperture flat 0.111 15 Reflective element flat 14.032 Glass 1.835 42.7 - 16 flat 0.400 17 Filter element flat 0.210 plastic 1.517 64.2 - 18 flat 0.423 19 Imaging surface flat - The reference wavelength (d-line) is 587.6 nm. The effective radius of surface 1 (aperture S1) is 2.983 mm. The effective radius of surface 4 (aperture S2) is 2.738 mm. The effective radius of surface 11 (aperture S3) is 2.399 mm. The effective radius of surface 14 (aperture S4) is 2.069 mm. The imaging optical lens can further include an aperture, and the position of the aperture can be adjusted depending on the object distance. In this embodiment, when the imaging optical lens is in the first state (object distance at infinity), the aperture is located on surface 1. In this embodiment, when the imaging optical lens is in the second state (limited object distance), the aperture is located on surface 4.

[0215] In this embodiment, the imaging optical lens is in the second state with the subject located at a finite object distance of 119.299 mm as an example, but this disclosure is not limited to this.

[0216] Table 4B. Parameters of the imaging optical lens in the first and second states, respectively. First state (object distance at infinity) Second state (finite object distance) fL [millimeters] 13.47 fS [millimeters] 12.70 FnoL 2.26 FnoS 2.46 HFOVL [degree] 14.8 HFOVS [degree] 13.6 Object distance [millimeters] ∞ Object distance [millimeters] 119.299 D0 [millimeters] ∞ D0 [millimeters] 119.269 D1 [millimeters] 0.609 D1 [millimeters] 1.340

[0217] The definitions described in Table 4B are the same as those in the first embodiment. It should be understood that this embodiment only discloses the above two moving focus states, but this disclosure is not limited to the states disclosed above, and the imaging optical lens of this embodiment may have other moving focus states with different focal lengths between the first state and the second state in addition to the first state and the second state, so as to correspond to other focusing states with different object distances.

[0218] As shown in Table 4B, the imaging optical lens performs a focusing process based on changes in object distance. During the focusing process as the imaging optical lens transitions from the first state to the second state, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side. Specifically, when the object distance changes from infinity to 119.299 mm, the imaging optical lens transitions from the first state to the second state. The distance D1 between the moving lens group G1 and the final lens group G2 along the optical axis increases from 0.609 mm in the first state to 1.340 mm in the second state. However, the final lens group G2 does not move relative to the reflecting element E6 during the focusing process. In other words, as the object distance decreases, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side during the focusing process.

[0219] Table 4C, Aspheric Coefficient surface 5 6 7 8 k = 9.853990000E-03 -1.553550000E-03 -6.402240000E-01 8.397570000E-03 A4 = -5.661552842E-03 -1.837245335E-02 5.049044071E-02 4.121602659E-02 A6 = 2.004547015E-03 1.543190547E-02 -1.424281444E-02 -1.819968322E-02 A8 = -5.417387896E-03 -3.766781815E-02 2.245010004E-02 1.492633587E-02 A10 = 5.939285073E-03 5.508151688E-02 -2.637081092E-02 -1.071064435E-02 A12 = -3.070788816E-03 -4.848067348E-02 1.853225738E-02 5.759795956E-03 A14 = 5.262034530E-04 2.787106801E-02 -8.472966932E-03 -2.257115029E-03 A16 = 2.410580717E-04 -1.103573734E-02 2.638165574E-03 6.794320028E-04 A18 = -1.779465346E-04 3.098227994E-03 -5.657076218E-04 -1.703848092E-04 A20 = 5.453561811E-05 -6.234049110E-04 8.185734329E-05 3.701124252E-05 A22 = -1.002644419E-05 8.940650309E-05 -7.456377712E-06 -6.652772361E-06 A24 = 1.177395263E-06 -8.922364390E-06 3.403762253E-07 9.010006776E-07 A26 = -8.686467212E-08 5.884170444E-07 2.641576710E-09 -8.305180085E-08 A28 = 3.681113170E-09 -2.303168661E-08 -1.018175267E-09 4.571738253E-09 A30 = -6.846616675E-11 4.047762866E-10 3.260494283E-11 -1.128176946E-10 surface 9 10 12 13 k = -1.242180000E-01 -5.390780000E-02 5.901200000E-02 2.673060000E-02 A4 = -1.134849085E-02 8.061783036E-03 2.161234819E-02 1.764727427E-02 A6 = -1.175828700E-02 -3.608792652E-02 -8.795660758E-04 -1.233379499E-03 A8 = -2.836476535E-02 2.745955969E-02 -4.862421536E-02 -1.333178191E-02 A10 = 6.009778365E-02 -1.463208884E-02 1.129219842E-01 1.755357052E-02 A12 = -5.935390163E-02 6.643543550E-03 -1.499804861E-01 -1.070775351E-02 A14 = 3.835423460E-02 -2.516704253E-03 1.340286676E-01 2.368742132E-03 A16 = -1.743572349E-02 7.361426865E-04 -8.420399083E-02 1.263632791E-03 A18 = 5.704842097E-03 -1.578853088E-04 3.774511353E-02 -1.363219312E-03 A20 = -1.348717808E-03 2.471366836E-05 -1.209463693E-02 6.357049570E-04 A22 = 2.281147351E-04 -2.976207835E-06 2.743936756E-03 -1.884516651E-04 A24 = -2.688560380E-05 3.012469825E-07 -4.298751016E-04 3.745077263E-05 A26 = 2.095107404E-06 -2.522793322E-08 4.418992964E-05 -4.844026659E-06 A28 = -9.693157584E-08 1.412254872E-09 -2.680148420E-06 3.685282165E-07 A30 = 2.014318294E-09 -3.555981065E-11 7.264042917E-08 -1.249438152E-08

[0220] In the fourth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in Table 4D below are the same as in the first embodiment and will not be repeated here.

[0221] Table 4D, Polynomial Data fL [millimeters] 13.47 fL / R5 -6.01 FnoL 2.26 |f3 / f2| 0.23 HFOVL [degree] 14.8 |R3 / fL|+|R4 / fL| 0.76 FOVL [degree] 29.6 (R1-R4) / (R1+R4) 0.24 fS [millimeters] 12.70 (R1-R5) / (R1+R5) 1.62 FnoS 2.46 CT1 / CT2 1.53 HFOVS [degree] 13.6 CT1 / Dr3r8L 0.32 FOVS [degree] 27.2 T23L / CT4 1.19 TLS / TLL 1.037 10×T45L / fL 0.26 fL / fG1 1.50 CT5 / T45L 0.74 |TDS - TDL| [mm] 0.73 N1 1.954 10×|TDS - TDL| / TDL 1.77 V5 20.4 DG2 / DG1 0.07 V5 / N5 12.29 TLL / fL 1.46 ET12L / CT2 0.98 BLL / TDL 3.76 Sag2R1L / CT2 0.78 SDL / TDL 1.01 Y1R1L / Y5R2L 1.44 fL / f3 -1.85 Y1R1L / ImgH 0.83 T34L / CT2 0.30 - -

[0222] <Fifth Embodiment>

[0223] Please refer to Figures 13 to 15. Figure 13 shows schematic diagrams of the imaging device according to the fifth embodiment of this disclosure in a first state and a second state, respectively. Figure 14, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the fifth embodiment in the first state, and Figure 15, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the fifth embodiment in the second state. The upper half of Figure 13 is a schematic diagram of the imaging optical lens in the first state, while the lower half of Figure 13 is a schematic diagram of the imaging optical lens in the second state. As shown in Figure 13, the imaging device 5 includes an imaging optical lens (not otherwise labeled) and an electronic photosensitive element IS. The imaging optical lens, along the optical path direction from the object side to the image side, includes, in sequence, an aperture stop S1, a first lens E1, an aperture stop S2, a second lens E2, a third lens E3, a fourth lens E4, an aperture stop S3, a fifth lens E5, an aperture stop S4, a reflective element E6, a filter element E7, and an imaging surface IMG. Furthermore, the imaging optical lens, along the optical path direction from the object side to the image side, has a moving lens group G1 and a final lens group G2 in sequence. The moving lens group G1 includes an aperture stop S1, a first lens E1, an aperture stop S2, a second lens E2, a third lens E3, a fourth lens E4, and an aperture stop S3. The final lens group G2 includes a fifth lens E5 and an aperture stop S4. The electronic photosensitive element IS is disposed on the imaging plane IMG. The imaging optical lens comprises five lenses (E1, E2, E3, E4, E5), and there are no other interposed lenses between each lens. Additionally, there are no other lenses on the optical axis between the final lens group G2 and the reflecting element E6.

[0224] The imaging optical lens adjusts its focal length by changing the distance between two lens groups (G1, G2) during the focusing process. When the subject is at infinity, the imaging optical lens is in the first state shown in the upper part of Figure 13. When the subject is at a finite distance, the imaging optical lens is in the second state, for example, shown in the lower part of Figure 13. Specifically, when the subject moves from infinity to a finite distance, the imaging optical lens performs a focusing process to change from the first state to the second state. Conversely, when the subject moves from a finite distance to infinity, the imaging optical lens also performs a focusing process to change from the second state to the first state. The first state refers to the state of the imaging optical lens when the subject is at infinity; the second state refers to the state of the imaging optical lens when the subject is at a finite distance. As shown in Figure 13, the moving lens group G1 moves relative to the final lens group G2 along the optical axis during the focusing process. In this process, during the focusing motion of the imaging optical lens from its first state to its second state, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side. It should be noted that the elements in the moving lens group G1 (e.g., lenses, aperture stops, and / or diaphragms) do not move relative to each other during the focusing motion, and the elements in the final lens group G2 (e.g., lenses, aperture stops, and / or diaphragms) also do not move relative to each other during the focusing motion. Furthermore, during the focusing motion, the final lens group G2 does not move relative to the reflecting element E6.

[0225] The first lens E1 has positive refractive power and is made of glass. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical, and its image-side surface has a point of inflection.

[0226] The second lens E2 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both surfaces are aspherical. Its object-side surface has two inflection points, and its image-side surface has three inflection points.

[0227] The third lens E3 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both surfaces are aspherical. Its object-side surface has two inflection points, its image-side surface has one inflection point, and its image-side surface has a critical point off-axis.

[0228] The fourth lens E4 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has two inflection points, its image-side surface has one inflection point, and its object-side surface has a critical point off-axis.

[0229] The fifth lens, E5, has positive refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical.

[0230] The reflective element E6 is made of glass and is positioned between the fifth lens E5 and the imaging plane IMG along the optical axis, without affecting the focal length of the imaging lens. The reflective element E6 is a prism with a light path reversal function. For ease of explanation, Figure 13 does not show the reversal effect of the reflective element E6 on the light path. However, the reflective element E6 can have various forms depending on actual design requirements, thus creating different reversal effects on the light path. In this embodiment, the reflective element E6 can, for example, have a structure similar to Figures 53 to 58, as described above with reference to the corresponding Figures 53 to 58, and will not be repeated here. Furthermore, the reflective element E6 in this embodiment can also, for example, have a structure similar to Figure 50, and can reversal the light path five times, as described above with reference to the corresponding Figure 50, and will not be repeated here.

[0231] The filter element E7 is made of plastic and is located between the reflective element E6 and the imaging surface IMG. It does not affect the focal length of the imaging optical lens.

[0232] Please refer to Tables 5A to 5D below.

[0233] Table 5A, Fifth Embodiment surface radius of curvature thickness Material Refractive index Abbe number focal length 0 Subject flat D0 1 Aperture flat -0.099 2 First lens 13.3021 (ASP) 0.762 Glass 1.954 32.3 9.53 3 -27.9169 (ASP) 0.862 4 Aperture flat -0.638 5 Second lens 3.3258 (ASP) 0.763 plastic 1.544 56.0 38.38 6 3.6361 (ASP) 0.938 7 Third lens -2.3876 (ASP) 0.505 plastic 1.660 20.4 -5.56 8 -7.3978 (ASP) 0.389 9 Fourth lens 9.4579 (ASP) 0.577 plastic 1.544 56.0 9.54 10 -11.2590 (ASP) -0.218 11 Aperture flat D1 12 Fifth lens -8.1449 (ASP) 0.350 plastic 1.669 19.5 1239.25 13 -8.2046 (ASP) -0.172 14 Aperture flat 0.450 15 Reflective element flat 12.500 Glass 1.835 42.7 - 16 flat 0.250 17 Filter element flat 0.210 plastic 1.517 64.2 - 18 flat 0.260 19 Imaging surface flat - The reference wavelength (d-line) is 587.6 nm. The effective radius of surface 1 (aperture S1) is 2.698 mm. The effective radius of surface 4 (aperture S2) is 2.249 mm. The effective radius of surface 11 (aperture S3) is 1.968 mm. The effective radius of surface 14 (aperture S4) is 1.864 mm. The imaging optical lens can further include an aperture, and the position of the aperture can be adjusted depending on the object distance. In this embodiment, when the imaging optical lens is in the first state (object distance at infinity), the aperture is located on surface 1. In this embodiment, when the imaging optical lens is in the second state (limited object distance), the aperture is located on surface 11.

[0234] In this embodiment, the imaging optical lens is in the second state with the subject located at a finite object distance of 118.701 mm as an example, but this disclosure is not limited to this.

[0235] Table 5B: Parameters of the imaging optical lens in the first and second states, respectively. First state (object distance at infinity) Second state (finite object distance) fL [millimeters] 12.17 fS [millimeters] 12.19 FnoL 2.26 FnoS 2.56 HFOVL [degree] 15.0 HFOVS [degree] 13.0 Object distance [millimeters] ∞ Object distance [millimeters] 118.701 D0 [millimeters] ∞ D0 [millimeters] 118.800 D1 [millimeters] 0.766 D1 [millimeters] 1.966

[0236] The definitions described in Table 5B are the same as those in the first embodiment. It should be understood that this embodiment only discloses the above two moving focus states, but this disclosure is not limited to the states disclosed above, and the imaging optical lens of this embodiment may have other moving focus states with different focal lengths between the first state and the second state in addition to the first state and the second state, so as to correspond to other focusing states with different object distances.

[0237] As shown in Table 5B, the imaging optical lens performs a focusing process based on changes in object distance. During the focusing process as the imaging optical lens transitions from the first state to the second state, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side. Specifically, when the object distance changes from infinity to 118.701 mm, the imaging optical lens transitions from the first state to the second state. The distance D1 between the moving lens group G1 and the final lens group G2 along the optical axis increases from 0.766 mm in the first state to 1.966 mm in the second state. However, the final lens group G2 does not move relative to the reflecting element E6 during the focusing process. In other words, as the object distance decreases, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side during the focusing process.

[0238] Table 5C, Aspheric Coefficient surface 2 3 5 6 k = 2.960400000E+00 2.681490000E+01 -3.392450000E-01 6.051890000E-01 A4 = 1.121369374E-04 -2.177738177E-03 -5.644791183E-03 -3.920766410E-03 A6 = 3.181855611E-04 3.751710245E-04 -2.911878417E-03 7.441362830E-03 A8 = -9.452319319E-05 4.861110560E-04 4.419150232E-03 -4.070827173E-02 A10 = 1.632358908E-05 -2.757728166E-04 -1.055235193E-02 7.152205725E-02 A12 = -3.147246786E-06 6.490756992E-05 1.542520387E-02 -8.371373083E-02 A14 = 3.711563070E-07 -8.185489245E-06 -1.367517198E-02 7.290950885E-02 A16 = -1.499699128E-08 5.518060371E-07 8.030718419E-03 -4.752608607E-02 A18 = - -1.563824671E-08 -3.278602078E-03 2.292247214E-02 A20 = - - 9.467213807E-04 -8.095877461E-03 A22 = - - -1.926702452E-04 2.062783641E-03 A24 = - - 2.701747590E-05 -3.685099410E-04 A26 = - - -2.483536084E-06 4.371672947E-05 A28 = - - 1.346864661E-07 -3.086704100E-06 A30 = - - -3.266573941E-09 9.795969820E-08 Surface 7 8 9 10 k = -6.729020000E-01 6.285900000E-01 -3.048960000E+01 1.654370000E+01 A4 = 5.508569629E-02 -9.896540910E-03 -1.216775605E-01 -9.770411521E-02 A6 = 6.156310514E-02 1.889760270E-01 3.029526449E-01 2.630186382E-01 A8 = -2.195615162E-01 -4.529926033E-01 -6.000750315E-01 -5.412886192E-01 A10 = 3.620226183E-01 6.804543975E-01 8.216184049E-01 7.808532123E-01 A12 = -3.871398377E-01 -7.091967434E-01 -8.063505296E-01 -8.162824041E-01 A14 = 2.922744637E-01 5.379440598E-01 5.843641188E-01 6.317295097E-01 A16 = -1.615178675E-01 -3.040727515E-01 -3.176624136E-01 -3.655564784E-01 A18 = 6.620784901E-02 1.289331575E-01 1.298625141E-01 1.582668050E-01 A20 = -2.010611412E-02 -4.077503331E-02 -3.959529460E-02 -5.087898817E-02 A22 = 4.462601517E-03 9.457589323E-03 8.837268758E-03 1.193994872E-02 A24 = -7.033079895E-04 -1.559821760E-03 -1.397268647E-03 -1.983080504E-03 A26 = 7.453463997E-05 1.730375597E-04 1.477755460E-04 2.204776059E-04 A28 = -4.762184004E-06 -1.157138660E-05 -9.351233028E-06 -1.470172251E-05 A30 = 1.385816301E-07 3.524628490E-07 2.669939991E-07 4.441251833E-07 Surface 12 13 k = 1.013390000E+01 1.208720000E+01 A4 = -7.017555548E-02 -3.613499425E-02 A6 = 2.937624530E-01 1.600109336E-01 A8 = -7.169325574E-01 -3.626246804E-01 A10 = 1.196781691E+00 5.477588013E-01 A12 = -1.422129962E+00 -5.753876848E-01 A14 = 1.233844912E+00 4.316107069E-01 A16 = -7.926959229E-01 -2.343144293E-01 A18 = 3.789608291E-01 9.225078206E-02 A20 = -1.342600112E-01 -2.607595909E-02 A22 = 3.473969718E-02 5.155924662E-03 A24 = -6.374473435E-03 -6.768238279E-04 A26 = 7.851958631E-04 5.297734337E-05 A28 = -5.819678697E-05 -1.870883129E-06 A30 = 1.960759988E-06 -

[0239] In the fifth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in Table 5D below are the same as in the first embodiment and will not be repeated here.

[0240] Table 5D, Polynomial Data fL [millimeters] 12.17 fL / R5 -5.10 FnoL 2.26 |f3 / f2| 0.14 HFOVL [degree] 15.0 |R3 / fL|+|R4 / fL| 0.57 FOVL [degree] 30.0 (R1-R4) / (R1+R4) 0.57 fS [millimeters] 12.19 (R1 - R5) / (R1 + R5) 1.44 FnoS 2.56 CT1 / CT2 1.00 HFOVS [degrees] 13.0 CT1 / Dr3r8L 0.24 FOVS [degrees] 26.0 T23L / CT4 1.63 TLS / TLL 1.065 10×T45L / fL 0.45 fL / fG1 1.01 CT5 / T45L 0.64 |TDS - TDL| [mm] 1.20 N1 1.954 10×|TDS - TDL| / TDL 2.37 V5 19.5 DG2 / DG1 0.08 V5 / N5 11.68 TLL / fL 1.52 ET12L / CT2 1.32 BLL / TDL 2.67 Sag2R1L / CT2 0.85 SDL / TDL 0.98 Y1R1L / Y5R2L 1.45 fL / f3 -2.19 Y1R1L / ImgH 0.82 T34L / CT2 0.51 - -

[0241] <Sixth Embodiment>

[0242] Please refer to Figures 16 to 18, where Figure 16 illustrates schematic diagrams of the imaging device according to the sixth embodiment of this disclosure in a first state and a second state, Figure 17 shows, from left to right, spherical aberration, astigmatism, and distortion curves of the imaging device of the sixth embodiment in the first state, and Figure 18 shows, from left to right, spherical aberration, astigmatism, and distortion curves of the imaging device of the sixth embodiment in the second state. The upper half of Figure 16 is a schematic diagram of the imaging optical lens in the first state, and the lower half of Figure 16 is a schematic diagram of the imaging optical lens in the second state. As shown in Figure 16, the imaging device 6 includes an imaging optical lens (not otherwise labeled) and an electronic photosensitive element IS. The imaging optical lens, along the optical path direction from the object side to the image side, includes, in sequence, an aperture stop S1, a first lens E1, an aperture stop S2, a second lens E2, a third lens E3, a fourth lens E4, an aperture stop S3, a fifth lens E5, an aperture stop S4, a reflective element E6, a filter element E7, and an imaging surface IMG. Furthermore, the imaging optical lens, along the optical path direction from the object side to the image side, has a moving lens group G1 and a final lens group G2 in sequence. The moving lens group G1 includes an aperture stop S1, a first lens E1, an aperture stop S2, a second lens E2, a third lens E3, a fourth lens E4, and an aperture stop S3. The final lens group G2 includes a fifth lens E5 and an aperture stop S4. The electronic photosensitive element IS is disposed on the imaging plane IMG. The imaging optical lens comprises five lenses (E1, E2, E3, E4, E5), and there are no other interposed lenses between each lens. Additionally, there are no other lenses on the optical axis between the final lens group G2 and the reflecting element E6.

[0243] The imaging optical lens adjusts its focal length by changing the distance between two lens groups (G1, G2) during the focusing process. When the subject is at infinity, the imaging optical lens is in the first state shown in the upper part of Figure 16. When the subject is at a finite distance, the imaging optical lens is in the second state, for example, shown in the lower part of Figure 16. Specifically, when the subject moves from infinity to a finite distance, the imaging optical lens performs a focusing process to change from the first state to the second state. Conversely, when the subject moves from a finite distance to infinity, the imaging optical lens also performs a focusing process to change from the second state to the first state. The first state refers to the state of the imaging optical lens when the subject is at infinity; the second state refers to the state of the imaging optical lens when the subject is at a finite distance. As shown in Figure 16, the moving lens group G1 moves relative to the final lens group G2 along the optical axis during the focusing process. In this process, during the focusing motion of the imaging optical lens from its first state to its second state, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side. It should be noted that the elements in the moving lens group G1 (e.g., lenses, aperture stops, and / or diaphragms) do not move relative to each other during the focusing motion, and the elements in the final lens group G2 (e.g., lenses, aperture stops, and / or diaphragms) also do not move relative to each other during the focusing motion. Furthermore, during the focusing motion, the final lens group G2 does not move relative to the reflecting element E6.

[0244] The first lens E1 has positive refractive power and is made of glass. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are spherical.

[0245] The second lens E2 has positive refractive power and is made of glass. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection, and its image-side surface also has a point of inflection.

[0246] The third lens E3 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has three inflection points, and its image-side surface has two inflection points.

[0247] The fourth lens E4 has positive refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has three inflection points, its image-side surface has one inflection point, and its object-side surface has a critical point off-axis.

[0248] The fifth lens E5 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both surfaces are aspherical. Its object-side surface has a point of inflection, its image-side surface has a point of inflection, its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0249] The reflective element E6 is made of glass and is positioned between the fifth lens E5 and the imaging plane IMG along the optical axis, without affecting the focal length of the imaging lens. The reflective element E6 is a prism with a light path reversal function. For ease of explanation, Figure 16 does not show the reversal effect of the reflective element E6 on the light path. However, the reflective element E6 can have various forms depending on actual design requirements, thus creating different reversal effects on the light path. In this embodiment, the reflective element E6 can, for example, have a structure similar to Figures 53 to 58, as described above with reference to the corresponding Figures 53 to 58, and will not be repeated here. Furthermore, the reflective element E6 in this embodiment can also, for example, have a structure similar to Figure 50, and can reversal the light path five times, as described above with reference to the corresponding Figure 50, and will not be repeated here.

[0250] The filter element E7 is made of plastic and is located between the reflective element E6 and the imaging surface IMG. It does not affect the focal length of the imaging optical lens.

[0251] Please refer to Tables 6A to 6D below.

[0252] Table 6A, Sixth Embodiment surface radius of curvature thickness Material Refractive index Abbe number focal length 0 Subject flat D0 1 Aperture flat -0.030 2 First lens 9.1593 (SPH) 0.957 Glass 1.954 32.3 7.99 3 -43.1711 (SPH) 0.436 4 Aperture flat -0.396 5 Second lens 7.4591 (ASP) 0.493 Glass 1.851 40.1 14.06 6 19.1983 (ASP) 0.500 7 Third lens -5.0557 (ASP) 0.481 plastic 1.615 25.4 -5.56 8 10.9223 (ASP) 0.609 9 Fourth lens -36.6596 (ASP) 0.680 plastic 1.544 56.0 13.67 10 -6.2243 (ASP) -0.202 11 Aperture flat D1 12 Fifth lens -6.6010 (ASP) 0.250 plastic 1.656 21.3 -21.07 13 -12.8250 (ASP) 0.105 14 Aperture flat 0.308 15 Reflective element flat 14.032 Glass 1.835 42.7 - 16 flat 0.400 17 Filter element flat 0.210 plastic 1.517 64.2 - 18 flat 0.202 19 Imaging surface flat - The reference wavelength (d-line) is 587.6 nm. The effective radius of surface 1 (aperture S1) is 2.981 mm. The effective radius of surface 4 (aperture S2) is 2.696 mm. The effective radius of surface 11 (aperture S3) is 2.234 mm. The effective radius of surface 14 (aperture S4) is 2.058 mm. The imaging optical lens can further include an aperture, and the position of the aperture can be adjusted depending on the object distance. In this embodiment, when the imaging optical lens is in the first state (object distance at infinity), the aperture is located on surface 1. In this embodiment, when the imaging optical lens is in the second state (limited object distance), the aperture is located on surface 4.

[0253] In this embodiment, the imaging optical lens is in the second state with the subject located at a finite object distance of 119.197 mm as an example, but this disclosure is not limited to this.

[0254] Table 6B. Parameters of the imaging optical lens in the first and second states, respectively. First state (object distance at infinity) Second state (finite object distance) fL [millimeters] 13.47 fS [millimeters] 12.77 FnoL 2.26 FnoS 2.48 HFOVL [degree] 14.8 HFOVS [degree] 13.5 Object distance [millimeters] ∞ Object distance [millimeters] 119.197 D0 [millimeters] ∞ D0 [millimeters] 119.227 D1 [millimeters] 0.602 D1 [millimeters] 1.405

[0255] The definitions described in Table 6B are the same as those in the first embodiment. It should be understood that this embodiment only discloses the above two moving focus states, but this disclosure is not limited to the states disclosed above, and the imaging optical lens of this embodiment may have other moving focus states with different focal lengths between the first state and the second state in addition to the first state and the second state, so as to correspond to other focusing states with different object distances.

[0256] As shown in Table 6B, the imaging optical lens performs a focusing process based on changes in object distance. During the focusing process as the imaging optical lens transitions from the first state to the second state, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side. Specifically, when the object distance changes from infinity to 119.197 mm, the imaging optical lens transitions from the first state to the second state. The distance D1 between the moving lens group G1 and the final lens group G2 along the optical axis increases from 0.602 mm in the first state to 1.405 mm in the second state. However, the final lens group G2 does not move relative to the reflecting element E6 during the focusing process. In other words, as the object distance decreases, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side during the focusing process.

[0257] Table 6C, Aspheric Coefficient surface 5 6 7 8 k = 0.000000000E+00 0.000000000E+00 7.869100000E-01 0.000000000E+00 A4 = -1.629514583E-03 5.437045707E-03 8.021921023E-02 8.036268126E-02 A6 = 1.353478272E-03 9.591737004E-04 -5.465178573E-02 -5.696824913E-02 A8 = -8.980727897E-04 -1.993365770E-03 2.946739771E-02 2.070974372E-02 A10 = 2.654629308E-04 9.253466337E-04 -1.331558520E-02 8.021514293E-04 A12 = -2.410189560E-05 -1.897204866E-04 5.323416140E-03 -5.004929039E-03 A14 = -5.583685153E-06 1.260725678E-05 -1.805387754E-03 2.700688206E-03 A16 = 1.682795561E-06 1.583028520E-06 4.782796958E-04 -7.908864942E-04 A18 = -1.665909704E-07 -3.138433038E-07 -9.257843648E-05 1.435813411E-04 A20 = 5.967523498E-09 1.486173317E-08 1.242646800E-05 -1.621167962E-05 A22 = - - -1.087250454E-06 1.049772204E-06 A24 = - - 5.555066907E-08 -2.988287491E-08 A26 = - - -1.254047085E-09 - Surface 9 10 12 13 k = 0.000000000E+00 0.000000000E+00 0.000000000E+00 0.000000000E+00 A4 = 2.676760158E-02 2.096172230E-02 3.970619346E-02 3.000906870E-02 A6 = -3.010868550E-02 -4.117171815E-02 -3.137166106E-02 -8.086125163E-03 A8 = 1.564877631E-02 4.686096639E-02 2.872903440E-02 -4.608435249E-03 A10 = 2.457016232E-03 -3.370169277E-02 -1.872137632E-02 1.121796070E-02 A12 = -9.248990371E-03 1.595925921E-02 8.232624904E-03 -9.134437804E-03 A14 = 6.549628198E-03 -5.092422976E-03 -2.430533674E-03 4.187658643E-03 A16 = -2.599633965E-03 1.098243360E-03 4.739770475E-04 -1.173144862E-03 A18 = 6.585499577E-04 -1.565434397E-04 -5.841911117E-05 1.993614394E-04 A20 = -1.088455555E-04 1.392274860E-05 4.111514781E-06 -1.891139133E-05 A22 = 1.137767342E-05 -6.821890754E-07 -1.254758745E-07 7.692039023E-07 A24 = -6.826667222E-07 1.337663722E-08 - - A26 = 1.789641218E-08 - - -

[0258] In the sixth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in Table 6D below are the same as in the first embodiment and will not be repeated here.

[0259] Table 6D, Polynomial Data fL [millimeters] 13.47 fL / R5 -2.66 FnoL 2.26 |f3 / f2| 0.40 HFOVL [degree] 14.8 |R3 / fL|+|R4 / fL| 1.98 FOVL [degree] 29.6 (R1-R4) / (R1+R4) -0.35 fS [millimeters] 12.77 (R1-R5) / (R1+R5) 3.46 FnoS 2.48 CT1 / CT2 1.94 HFOVS [degree] 13.5 CT1 / Dr3r8L 0.35 FOVS [degrees] 27.0 T23L / CT4 0.74 TLS / TLL 1.041 10×T45L / fL 0.30 fL / fG1 1.43 CT5 / T45L 0.63 |TDS - TDL| [mm] 0.80 N1 1.954 10×|TDS - TDL| / TDL 1.82 V5 21.3 DG2 / DG1 0.07 V5 / N5 12.86 TLL / fL 1.46 ET12L / CT2 1.11 BLL / TDL 3.46 Sag2R1L / CT2 0.83 SDL / TDL 0.99 Y1R1L / Y5R2L 1.45 fL / f3 -2.42 Y1R1L / ImgH 0.83 T34L / CT2 1.24 - -

[0260] <Seventh Embodiment>

[0261] Please refer to Figures 19 to 21, where Figure 19 shows schematic diagrams of the imaging device according to the seventh embodiment of this disclosure in a first state and a second state, Figure 20 shows, from left to right, the spherical aberration, astigmatism, and distortion curves of the imaging device of the seventh embodiment in the first state, and Figure 21 shows, from left to right, the spherical aberration, astigmatism, and distortion curves of the imaging device of the seventh embodiment in the second state. The upper half of Figure 19 is a schematic diagram of the imaging optical lens in the first state, and the lower half of Figure 19 is a schematic diagram of the imaging optical lens in the second state. As shown in Figure 19, the imaging device 7 includes an imaging optical lens (not otherwise labeled) and an electronic photosensitive element IS. The imaging optical lens, along the optical path direction from the object side to the image side, includes, in sequence, an aperture stop S1, a first lens E1, an aperture stop S2, a second lens E2, a third lens E3, a fourth lens E4, an aperture stop S3, a fifth lens E5, an aperture stop S4, a reflective element E6, a filter element E7, and an imaging surface IMG. Furthermore, the imaging optical lens, along the optical path direction from the object side to the image side, has a moving lens group G1 and a final lens group G2 in sequence. The moving lens group G1 includes an aperture stop S1, a first lens E1, an aperture stop S2, a second lens E2, a third lens E3, a fourth lens E4, and an aperture stop S3. The final lens group G2 includes a fifth lens E5 and an aperture stop S4. The electronic photosensitive element IS is disposed on the imaging plane IMG. The imaging optical lens comprises five lenses (E1, E2, E3, E4, E5), and there are no other interposed lenses between each lens. Additionally, there are no other lenses on the optical axis between the final lens group G2 and the reflecting element E6.

[0262] The imaging optical lens adjusts its focal length by changing the distance between two lens groups (G1, G2) during the focusing process. When the subject is at infinity, the imaging optical lens is in the first state shown in the upper half of Figure 19. When the subject is at a finite distance, the imaging optical lens is in the second state, for example, shown in the lower half of Figure 19. Specifically, when the subject moves from infinity to a finite distance, the imaging optical lens performs a focusing process to change from the first state to the second state. Conversely, when the subject moves from a finite distance to infinity, the imaging optical lens also performs a focusing process to change from the second state to the first state. The first state refers to the state of the imaging optical lens when the subject is at infinity; the second state refers to the state of the imaging optical lens when the subject is at a finite distance. As shown in Figure 19, the moving lens group G1 moves relative to the final lens group G2 along the optical axis during the focusing process. In this process, during the focusing motion of the imaging optical lens from its first state to its second state, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side. It should be noted that the elements in the moving lens group G1 (e.g., lenses, aperture stops, and / or diaphragms) do not move relative to each other during the focusing motion, and the elements in the final lens group G2 (e.g., lenses, aperture stops, and / or diaphragms) also do not move relative to each other during the focusing motion. Furthermore, during the focusing motion, the final lens group G2 does not move relative to the reflecting element E6.

[0263] The first lens E1 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has one inflection point, and its image-side surface has two inflection points.

[0264] The second lens E2 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has one inflection point, its image-side surface has two inflection points, and its image-side surface has a critical point off-axis.

[0265] The third lens E3 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection, and its image-side surface has a point of inflection. Its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0266] The fourth lens E4 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both surfaces are aspherical. Its object-side surface has two inflection points, its image-side surface has two inflection points, its object-side surface has two critical points off-axis, and its image-side surface has one critical point off-axis.

[0267] The fifth lens E5 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both surfaces are aspherical, and its object-side surface has a point of inflection.

[0268] The reflective element E6 is made of glass and is positioned between the fifth lens E5 and the imaging plane IMG along the optical axis, without affecting the focal length of the imaging lens. The reflective element E6 is a prism with a light path reversal function. For ease of explanation, Figure 19 does not show the reversal effect of the reflective element E6 on the light path. However, the reflective element E6 can have various forms depending on actual design requirements, thus creating different reversal effects on the light path. In this embodiment, the reflective element E6 can, for example, have a structure similar to Figures 53 to 58, as described above with reference to the corresponding Figures 53 to 58, and will not be repeated here. Furthermore, the reflective element E6 in this embodiment can also, for example, have a structure similar to Figure 50, and can reversal the light path five times, as described above with reference to the corresponding Figure 50, and will not be repeated here.

[0269] The filter element E7 is made of plastic and is located between the reflective element E6 and the imaging surface IMG. It does not affect the focal length of the imaging optical lens.

[0270] Please refer to Tables 7A to 7D below.

[0271] Table 7A, Seventh Embodiment surface radius of curvature thickness Material Refractive index Abbe number focal length 0 Subject flat D0 1 Aperture flat -0.448 2 First lens 6.8084 (ASP) 0.997 plastic 1.545 56.1 10.07 3 -26.8774 (ASP) 0.657 4 Aperture flat -0.617 5 Second lens 4.0561 (ASP) 0.719 plastic 1.642 22.5 37.95 6 4.5295 (ASP) 0.914 7 Third lens -2.1066 (ASP) 0.559 plastic 1.669 19.5 -6.93 8 -4.2723 (ASP) 0.030 9 Fourth lens 3.1400 (ASP) 0.523 plastic 1.587 28.3 7.74 10 9.5310 (ASP) 0.010 11 Aperture flat D1 12 Fifth lens 24.4450 (ASP) 0.240 plastic 1.639 23.5 -13.30 13 6.2784 (ASP) 0.338 14 Aperture flat 0.162 15 Reflective element flat 12.500 Glass 1.835 42.7 - 16 flat 0.350 17 Filter element flat 0.210 plastic 1.517 64.2 - 18 flat 0.463 19 Imaging surface flat - The reference wavelength (d-line) is 587.6 nm. The effective radius of surface 1 (aperture S1) is 2.935 mm. The effective radius of surface 4 (aperture S2) is 2.710 mm. The effective radius of surface 11 (aperture S3) is 2.105 mm. The effective radius of surface 14 (aperture S4) is 1.877 mm. The imaging optical lens can further include an aperture, and the position of the aperture can be adjusted depending on the object distance. In this embodiment, when the imaging optical lens is in the first state (object distance at infinity), the aperture is located on surface 1. In this embodiment, when the imaging optical lens is in the second state (limited object distance), the aperture is located on surface 11.

[0272] In this embodiment, the imaging optical lens is in the second state with the subject located at a finite object distance of 103.052 mm as an example, but this disclosure is not limited to this.

[0273] Table 7B. Parameters of the imaging optical lens in the first and second states, respectively. First state (object distance at infinity) Second state (finite object distance) fL [millimeters] 13.79 fS [millimeters] 12.64 FnoL 2.35 FnoS 2.63 HFOVL [degree] 13.2 HFOVS [degree] 11.7 Object distance [millimeters] ∞ Object distance [millimeters] 103.052 D0 [millimeters] ∞ D0 [millimeters] 103.500 D1 [millimeters] 0.661 D1 [millimeters] 1.411

[0274] The definitions described in Table 7B are the same as those in the first embodiment. It should be understood that this embodiment only discloses the above two moving focus states, but this disclosure is not limited to the states disclosed above, and the imaging optical lens of this embodiment may have other moving focus states with different focal lengths between the first state and the second state in addition to the first state and the second state, so as to correspond to other focusing states with different object distances.

[0275] As shown in Table 7B, the imaging optical lens performs a focusing process based on changes in object distance. During the focusing process as the imaging optical lens transitions from the first state to the second state, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side. Specifically, when the object distance changes from infinity to 103.052 mm, the imaging optical lens transitions from the first state to the second state. The distance D1 between the moving lens group G1 and the final lens group G2 along the optical axis increases from 0.661 mm in the first state to 1.411 mm in the second state. However, the final lens group G2 does not move relative to the reflecting element E6 during the focusing process. In other words, as the object distance decreases, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side during the focusing process.

[0276] Table 7C, Aspherical Coefficient surface 2 3 5 6 k = -1.611540000E+00 7.147020000E+01 2.112450000E-01 -1.841170000E+00 A4 = 9.519015624E-04 -1.948309813E-02 -2.772140012E-02 -1.785814383E-02 A6 = -1.473623089E-03 2.912775165E-02 3.227006487E-02 4.833660047E-03 A8 = 1.449721798E-03 -2.132344096E-02 -2.713267074E-02 3.451293157E-04 A10 = -8.919109221E-04 9.130504572E-03 1.876042476E-02 4.717881292E-04 A12 = 3.220301984E-04 -2.464318032E-03 -1.211535567E-02 -4.850085924E-03 A14 = -7.108943622E-05 4.339179485E-04 6.444789378E-03 5.416563527E-03 A16 = 9.667522979E-06 -4.989901396E-05 -2.535350900E-03 -3.055006313E-03 A18 = -7.689635487E-07 3.623223691E-06 7.166741542E-04 1.072157930E-03 A20 = 2.940916594E-08 -1.517010078E-07 -1.453135970E-04 -2.518353566E-04 A22 = -5.197807447E-11 2.864026497E-09 2.103915726E-05 4.054307076E-05 A24 = -2.198617571E-11 -4.575404616E-12 -2.131877601E-06 -4.440360152E-06 A26 = - - 1.440839733E-07 3.174775715E-07 A28 = - - <00​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​6.300620551E-02 -3.022235122E-03 -9.432546791E-03 A6 = -4.286473521E-02 -9.505629497E-02 -6.677381261E-02 2.559370788E-02 A8 = 3.572732883E-02 1.428458559E-01 1.089163054E-01 -8.002286293E-02 A10 = -3.082807301E-02 -1.583397467E-01 -1.310479838E-01 1.219317077E-01 A12 = 2.138126832E-02 1.300011253E-01 1.207387120E-01 -1.237273300E-01 A14 = -1.080026411E-02 -7.946368837E-02 -8.505107874E-02 8.913463244E-02 A16 = 3.934968601E-03 3.637274980E-02 4.512828443E-02 -4.685824515E-02 A18 = -1.042861154E-03 -1.246934114E-02 -1.773180608E-02 1.825813134E-02 A20 = 2.018407014E-04 3.177555140E-03 5.078632997E-03 -5.294096184E-03 A22 = -2.830955830E-05 -5.915123032E-04 -1.039937049E-03 1.131315280E-03 A24 = 2.807120124E-06 7.791478492E-05 1.476119067E-04 -1.733318460E-04 A26 = -1.867923587E-07 -6.858747273E-06 -1.374442702E-05 1.801849592E-05 A28 = 7.485090824E-09 3.607491912E-07 7.520864699E-07 -1.137288830E-06 A30 = -1.364465830E-10 -8.537256074E-09 -1.824206526E-08 3.285593300E-08 surface 12 13 k = -9.900000000E+01 -7.178850000E+00 A4 = 7.016251433E-04 4.599275711E-03 A6 = 2.528955201E-02 2.690813612E-02 A8 = -5.655804843E-02 -7.002819995E-02 A10 = 7.843657972E-02 1.172324890E-01 A12 = -7.321378984E-02 -1.378919990E-01 A14 = 4.525895807E-02 1.154946967E-01 A16 = -1.698876599E-02 -6.926760811E-02 A18 = 2.408556691E-03 2.971174815E-02 A20 = 1.056975931E-03 -9.021125335E-03 A22 = -7.197545288E-04 1.891173303E-03 A24 = 2.030486657E-04 -2.602463426E-04 A26 = -3.230467876E-05 2.115054348E-05 A28 = 2.828235857E-06 -7.693559602E-07 A30 = -1.065308331E-07 -

[0277] In the seventh embodiment, the equation of the aspherical curve is expressed in the form of the first embodiment. Furthermore, the definitions described in Table 7D below are the same as those in the first embodiment, and will not be repeated here.

[0278] Table 7D, Polynomial Data fL [million millimeters] 13.79 fL / R5 -6.55 FnoL 2.35 |f3 / f2| 0.18 HFOVL [degree] 13.2 |R3 / fL| + |R4 / fL| 0.62 FOVL [degrees] 26.4 (R1 - R4) / (R1 + R4) 0.20 fS [mm] 12.64 (R1 - R5) / (R1 + R5) 1.90 FnoS 2.63 CT1 / CT2 1.39 HFOVS [degrees] 11.7 CT1 / Dr3r8L 0.36 FOVS [degrees] 23.4 T23L / CT4 1.75 TLS / TLL 1.040 10×T45L / fL 0.49 fL / fG1 1.62 CT5 / T45L 0.36 |TDS - TDL| [mm] 0.75 N1 1.545 10×|TDS - TDL| / TDL 1.60 V5 23.5 DG2 / DG1 0.06 V5 / N5 14.34 TLL / fL 1.36 ET12L / CT2 1.22 BLL / TDL 2.99 Sag2R1L / CT2 0.90 SDL / TDL 0.90 Y1R1L / Y5R2L 1.56 fL / f3 -1.99 Y1R1L / ImgH 0.89 T34L / CT2 0.04 - -

[0279] <Eighth Embodiment>

[0280] Please refer to Figures 22 to 24. Figure 22 shows schematic diagrams of the imaging device according to the eighth embodiment of this disclosure in a first state and a second state, respectively. Figure 23, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the eighth embodiment in the first state, and Figure 24, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the eighth embodiment in the second state. The upper half of Figure 22 is a schematic diagram of the imaging optical lens in the first state, while the lower half of Figure 22 is a schematic diagram of the imaging optical lens in the second state. As shown in Figure 22, the imaging device 8 includes an imaging optical lens (not otherwise labeled) and an electronic photosensitive element IS. The imaging optical lens, along the optical path direction from the object side to the image side, includes, in sequence, an aperture stop S1, a first lens E1, an aperture stop S2, a second lens E2, a third lens E3, a fourth lens E4, an aperture stop S3, a fifth lens E5, an aperture stop S4, a reflective element E6, a filter element E7, and an imaging surface IMG. Furthermore, the imaging optical lens, along the optical path direction from the object side to the image side, has a moving lens group G1 and a final lens group G2 in sequence. The moving lens group G1 includes an aperture stop S1, a first lens E1, an aperture stop S2, a second lens E2, a third lens E3, a fourth lens E4, and an aperture stop S3. The final lens group G2 includes a fifth lens E5 and an aperture stop S4. The electronic photosensitive element IS is disposed on the imaging plane IMG. The imaging optical lens comprises five lenses (E1, E2, E3, E4, E5), and there are no other interposed lenses between each lens. Additionally, there are no other lenses on the optical axis between the final lens group G2 and the reflecting element E6.

[0281] The imaging optical lens adjusts its focal length by changing the distance between two lens groups (G1, G2) during the focusing process. When the subject is at infinity, the imaging optical lens is in the first state shown in the upper part of Figure 22. When the subject is at a finite distance, the imaging optical lens is in the second state, for example, shown in the lower part of Figure 22. Specifically, when the subject moves from infinity to a finite distance, the imaging optical lens performs a focusing process to change from the first state to the second state. Conversely, when the subject moves from a finite distance to infinity, the imaging optical lens also performs a focusing process to change from the second state to the first state. The first state refers to the state of the imaging optical lens when the subject is at infinity; the second state refers to the state of the imaging optical lens when the subject is at a finite distance. As shown in Figure 22, the moving lens group G1 moves relative to the final lens group G2 along the optical axis during the focusing process. In this process, during the focusing motion of the imaging optical lens from its first state to its second state, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side. It should be noted that the elements in the moving lens group G1 (e.g., lenses, aperture stops, and / or diaphragms) do not move relative to each other during the focusing motion, and the elements in the final lens group G2 (e.g., lenses, aperture stops, and / or diaphragms) also do not move relative to each other during the focusing motion. Furthermore, during the focusing motion, the final lens group G2 does not move relative to the reflecting element E6.

[0282] The first lens E1 has positive refractive power and is made of glass. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are spherical.

[0283] The second lens E2 has positive refractive power and is made of glass. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has one inflection point, its image-side surface has two inflection points, and its image-side surface has a critical point off-axis.

[0284] The third lens E3 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has three inflection points, its image-side surface has five inflection points, and its image-side surface has a critical point off-axis.

[0285] The fourth lens E4 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has six inflection points, and its image-side surface has one inflection point. Its object-side surface has two critical points off-axis, and its image-side surface has one critical point off-axis.

[0286] The fifth lens, E5, has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical.

[0287] The reflective element E6 is made of glass and is positioned between the fifth lens E5 and the imaging plane IMG along the optical axis, without affecting the focal length of the imaging lens. The reflective element E6 is a prism with a light path reversal function. For ease of explanation, Figure 22 does not show the reversal effect of the reflective element E6 on the light path. However, the reflective element E6 can have various forms depending on actual design requirements, thus creating different reversal effects on the light path. In this embodiment, the reflective element E6 can, for example, have a structure similar to Figures 53 to 58, as described above with reference to the corresponding Figures 53 to 58, and will not be repeated here. Furthermore, the reflective element E6 in this embodiment can also, for example, have a structure similar to Figure 50, and can reversal the light path five times, as described above with reference to the corresponding Figure 50, and will not be repeated here.

[0288] The filter element E7 is made of plastic and is located between the reflective element E6 and the imaging surface IMG. It does not affect the focal length of the imaging optical lens.

[0289] Please refer to Tables 8A to 8D below.

[0290] Table 8A, Eighth Embodiment surface radius of curvature thickness Material Refractive index Abbe number focal length 0 Subject flat D0 1 aperture flat 0.030 2 First lens 8.4485 (SPH) 0.903 Glass 1.954 32.3 8.06 3 -80.8583 (SPH) 0.410 4 aperture flat -0.370 5 Second lens 5.9705 (ASP) 0.607 Glass 1.497 81.6 29.41 6 9.7514 (ASP) 0.758 7 Third lens -2.2716 (ASP) 0.456 plastic 1.614 26.0 -5.80 8 -6.7570 (ASP) 0.138 9 Fourth lens 12.5536 (ASP) 0.712 plastic 1.544 56.0 9.56 10 -8.7090 (ASP) -0.198 11 aperture flat D1 12 Fifth lens 21.5221 (ASP) 0.260 plastic 1.639 23.5 -22.01 13 8.4624 (ASP) 0.328 14 aperture flat 0.150 15 Reflective element flat 14.032 Glass 1.835 42.7 - 16 flat 0.400 17 Filter element flat 0.210 plastic 1.517 64.2 - 18 flat 0.377 19 Imaging surface flat - The reference wavelength (d-line) is 587.6 nm. The effective radius of surface 1 (aperture S1) is 2.980 mm. The effective radius of surface 4 (aperture S2) is 2.732 mm. The effective radius of surface 11 (aperture S3) is 2.343 mm. The effective radius of surface 14 (aperture S4) is 2.066 mm. The imaging optical lens can further include an aperture, and the position of the aperture can be adjusted depending on the object distance. In this embodiment, when the imaging optical lens is in the first state (object distance at infinity), the aperture is located on surface 1. In this embodiment, when the imaging optical lens is in the second state (limited object distance), the aperture is located on surface 4.

[0291] In this embodiment, the imaging optical lens is in the second state with the subject located at a finite object distance of 119.230 mm as an example, but this disclosure is not limited to this.

[0292] Table 8B. Parameters of the imaging optical lens in the first and second states, respectively. First state (object distance at infinity) Second state (finite object distance) fL [millimeters] 13.45 fS [millimeters] 12.80 FnoL 2.26 FnoS 2.48 HFOVL [degree] 14.8 HFOVS [degree] 13.5 Object distance [millimeters] ∞ Object distance [millimeters] 119.230 D0 [millimeters] ∞ D0 [millimeters] 119.200 D1 [millimeters] 0.498 D1 [millimeters] 1.298

[0293] The definitions described in Table 8B are the same as those in the first embodiment. It should be understood that this embodiment only discloses the above two moving focus states, but this disclosure is not limited to the states disclosed above, and the imaging optical lens of this embodiment may have other moving focus states with different focal lengths between the first state and the second state in addition to the first state and the second state, so as to correspond to other focusing states with different object distances.

[0294] As shown in Table 8B, the imaging optical lens performs a focusing process based on changes in object distance. During the focusing process as the imaging optical lens transitions from the first state to the second state, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side. Specifically, when the object distance changes from infinity to 119.230 mm, the imaging optical lens transitions from the first state to the second state. The distance D1 between the moving lens group G1 and the final lens group G2 along the optical axis increases from 0.498 mm in the first state to 1.298 mm in the second state. However, the final lens group G2 does not move relative to the reflecting element E6 during the focusing process. In other words, as the object distance decreases, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side during the focusing process.

[0295] Table 8C, Aspheric Coefficient surface 5 6 7 8 k = 1.470450000E+00 7.512100000E+00 -6.060350000E-01 -9.903660000E-01 A4 = -6.511187892E-03 -2.018773073E-02 6.521566542E-03 -1.367445581E-01 A6 = -4.568732022E-03 -5.172713979E-03 1.563839065E-01 6.645200233E-01 A8 = 4.809137744E-03 1.939356777E-02 -2.683570684E-01 -1.289625443E+00 A10 = -8.049055746E-04 -1.725790307E-02 2.769180356E-01 1.507500873E+00 A12 = -1.545584158E-03 8.129138576E-03 -1.925283269E-01 -1.168408951E+00 A14 = 1.299589796E-03 -1.958191764E-03 9.436837368E-02 6.330743105E-01 A16 = -4.972590599E-04 6.772552728E-05 -3.344661157E-02 -2.469874641E-01 A18 = 1.078273939E-04 1.035863335E-04 8.666686428E-03 7.035414141E-02 A20 = -1.268118179E-05 -3.441290427E-05 -1.640722392E-03 -1.465627490E-02 A22 = 4.006617662E-07 5.827725652E-06 2.241533185E-04 2.209401718E-03 A24 = 9.894314799E-08 -6.122879509E-07 -2.149882066E-05 -2.346947506E-04 A26 = -1.498992259E-08 4.105071587E-08 1.372761015E-06 1.666385312E-05 A28 = 8.825408307E-10 -1.652601769E-09 -5.239765654E-08 -7.098567141E-07 A30 = -2.007383079E-11 3.106838827E-11 9.047004081E-10 1.371817899E-08 Surface 9 10 12 13 k = 3.850530000E+00 -3.829680000E+01 -7.920820000E+01 5.846360000E+00 A4 = -2.050500202E-01 -5.718488607E-02 -1.703113894E-02 -2.741979692E-03 A6 = 7.417977234E-01 1.968110808E-01 1.366256587E-01 6.237699660E-02 A8 = -1.515141644E+00 -4.367984013E-01 -3.616562686E-01 -1.908819713E-01 A10 = 1.846227862E+00 5.633714475E-01 5.789172999E-01 3.563932259E-01 A12 = -1.476924723E+00 -4.716669356E-01 -6.213579379E-01 -4.483476022E-01 A14 = 8.210148094E-01 2.729193003E-01 4.684887375E-01 3.935864486E-01 A16 = -3.270491050E-01 -1.127364309E-01 -2.543594364E-01 -2.463043345E-01 A18 = 9.471388974E-02 3.373715358E-02 1.005615885E-01 1.111231619E-01 A20 = -1.998223713E-02 -7.326023619E-03 -2.895062023E-02 -3.619107832E-02 A22 = 3.039622957E-03 1.141639726E-03 5.998682113E-03 8.422768469E-03 A24 = -3.246935320E-04 -1.242386154E-04 -8.705609229E-04 -1.365070645E-03 A26 = 2.310532656E-05 8.949838145E-06 8.391158426E-05 1.462734057E-04 A28 = -9.831915932E-07 -3.828434010E-07 -4.821750837E-06 -9.311150697E-06 A30 = 1.891800791E-08 7.349745619E-09 1.249269092E-07 2.665229599E-07

[0296] In the eighth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in Table 8D below are the same as in the first embodiment and will not be repeated here.

[0297] Table 8D, Polynomial Data fL [millimeters] 13.45 fL / R5 -5.92 FnoL 2.26 |f3 / f2| 0.20 HFOVL [degree] 14.8 |R3 / fL|+|R4 / fL| 1.17 FOVL [degree] 29.6 (R1-R4) / (R1+R4) -0.07 fS [millimeters] 12.80 (R1-R5) / (R1+R5) 1.74 FnoS 2.48 CT1 / CT2 1.49 HFOVS [degree] 13.5 CT1 / Dr3r8L 0.34 FOVS [degree] 27.0 T23L / CT4 1.06 TLS / TLL 1.041 10×T45L / fL 0.22 fL / fG1 1.40 CT5 / T45L 0.87 |TDS - TDL| [mm] 0.80 N1 1.954 10×|TDS - TDL| / TDL 1.92 V5 23.5 DG2 / DG1 0.07 V5 / N5 14.34 TLL / fL 1.46 ET12L / CT2 0.81 BLL / TDL 3.71 Sag2R1L / CT2 0.66 SDL / TDL 1.01 Y1R1L / Y5R2L 1.44 fL / f3 -2.32 Y1R1L / ImgH 0.83 T34L / CT2 0.23 - -

[0298] <Example 9>

[0299] Please refer to Figures 25 to 27, where Figure 25 shows schematic diagrams of the imaging device according to the ninth embodiment of this disclosure in a first state and a second state, Figure 26 shows, from left to right, the spherical aberration, astigmatism, and distortion curves of the imaging device of the ninth embodiment in the first state, and Figure 27 shows, from left to right, the spherical aberration, astigmatism, and distortion curves of the imaging device of the ninth embodiment in the second state. The upper half of Figure 25 is a schematic diagram of the imaging optical lens in the first state, and the lower half of Figure 25 is a schematic diagram of the imaging optical lens in the second state. As shown in Figure 25, the imaging device 9 includes an imaging optical lens (not otherwise labeled) and an electronic photosensitive element IS. The imaging optical lens, along the optical path direction from the object side to the image side, includes, in sequence, an aperture stop S1, a first lens E1, an aperture stop S2, a second lens E2, a third lens E3, a fourth lens E4, an aperture stop S3, a fifth lens E5, an aperture stop S4, a reflective element E6, a filter element E7, and an imaging surface IMG. Furthermore, the imaging optical lens, along the optical path direction from the object side to the image side, has a moving lens group G1 and a final lens group G2 in sequence. The moving lens group G1 includes an aperture stop S1, a first lens E1, an aperture stop S2, a second lens E2, a third lens E3, a fourth lens E4, and an aperture stop S3. The final lens group G2 includes a fifth lens E5 and an aperture stop S4. The electronic photosensitive element IS is disposed on the imaging plane IMG. The imaging optical lens comprises five lenses (E1, E2, E3, E4, E5), and there are no other interposed lenses between each lens. Additionally, there are no other lenses on the optical axis between the final lens group G2 and the reflecting element E6.

[0300] The imaging optical lens adjusts its focal length by changing the distance between two lens groups (G1, G2) during the focusing process. When the subject is at infinity, the imaging optical lens is in the first state shown in the upper half of Figure 25. When the subject is at a finite distance, the imaging optical lens is in the second state, for example, shown in the lower half of Figure 25. Specifically, when the subject moves from infinity to a finite distance, the imaging optical lens performs a focusing process to change from the first state to the second state. Conversely, when the subject moves from a finite distance to infinity, the imaging optical lens also performs a focusing process to change from the second state to the first state. The first state refers to the state of the imaging optical lens when the subject is at infinity; the second state refers to the state of the imaging optical lens when the subject is at a finite distance. As shown in Figure 25, the moving lens group G1 moves relative to the final lens group G2 along the optical axis during the focusing process. In this process, during the focusing motion of the imaging optical lens from its first state to its second state, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side. It should be noted that the elements in the moving lens group G1 (e.g., lenses, aperture stops, and / or diaphragms) do not move relative to each other during the focusing motion, and the elements in the final lens group G2 (e.g., lenses, aperture stops, and / or diaphragms) also do not move relative to each other during the focusing motion. Furthermore, during the focusing motion, the final lens group G2 does not move relative to the reflecting element E6.

[0301] The first lens E1 has positive refractive power and is made of glass. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its image-side surface has a point of inflection and a critical point off-axis.

[0302] The second lens E2 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has two inflection points, and its image-side surface has two inflection points. Its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0303] The third lens E3 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has one inflection point, and its image-side surface has two inflection points. Its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0304] The fourth lens E4 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has three inflection points, and its image-side surface has one inflection point. Its object-side surface has two critical points off-axis, and its image-side surface has one critical point off-axis.

[0305] The fifth lens E5 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection and a critical point off-axis.

[0306] The reflective element E6 is made of glass and is positioned between the fifth lens E5 and the imaging plane IMG along the optical axis, without affecting the focal length of the imaging lens. The reflective element E6 is a prism with a light path reversal function. For ease of explanation, Figure 25 does not show the reversal effect of the reflective element E6 on the light path. However, the reflective element E6 can have various forms depending on actual design requirements, thus creating different reversal effects on the light path. In this embodiment, the reflective element E6 can, for example, have a structure similar to Figures 53 to 58, as described above with reference to the corresponding Figures 53 to 58, and will not be repeated here. Furthermore, the reflective element E6 in this embodiment can also, for example, have a structure similar to Figure 50, and can reversal the light path five times, as described above with reference to the corresponding Figure 50, and will not be repeated here.

[0307] The filter element E7 is made of plastic and is located between the reflective element E6 and the imaging surface IMG. It does not affect the focal length of the imaging optical lens.

[0308] Please refer to Tables 9A to 9D below.

[0309] Table 9A, Ninth Embodiment surface radius of curvature thickness Material Refractive index Abbe number focal length 0 Subject flat D0 1 aperture flat -0.535 2 First lens 8.7650 (ASP) 1.096 Glass 1.883 39.2 8.79 3 -64.1356 (ASP) 0.603 4 aperture flat -0.421 5 Second lens 4.3840 (ASP) 0.629 plastic 1.544 56.0 43.67 6 5.1042 (ASP) 0.872 7 Third lens -2.2999 (ASP) 0.502 plastic 1.639 23.5 -8.20 8 -4.4518 (ASP) 0.125 9 Fourth lens 8.8083 (ASP) 0.478 plastic 1.566 37.4 12.24 10 -31.8195 (ASP) -0.128 11 aperture flat D1 12 Fifth lens -14.9276 (ASP) 0.422 plastic 1.669 19.5 -19.88 13 123.4659 (ASP) 0.164 14 aperture flat 0.179 15 Reflective element flat 13.050 Glass 1.835 42.7 - 16 flat 0.300 17 Filter element flat 0.210 plastic 1.517 64.2 - 18 flat 0.258 19 Imaging surface flat - The reference wavelength (d-line) is 587.6 nm. The effective radius of surface 1 (aperture S1) is 3.272 mm. The effective radius of surface 4 (aperture S2) is 2.921 mm. The effective radius of surface 11 (aperture S3) is 2.385 mm. The effective radius of surface 14 (aperture S4) is 2.027 mm. The imaging optical lens can further include an aperture, and the position of the aperture can be adjusted depending on the object distance. In this embodiment, when the imaging optical lens is in the first state (object distance at infinity), the aperture is located on surface 1. In this embodiment, when the imaging optical lens is in the second state (limited object distance), the aperture is located on surface 11.

[0310] In this embodiment, the imaging optical lens is in the second state with the subject located at a finite object distance of 118.665 mm as an example, but this disclosure is not limited to this.

[0311] Table 9B: Parameters of the imaging optical lens in the first and second states, respectively. First state (object distance at infinity) Second state (finite object distance) fL [millimeters] 13.43 fS [millimeters] 12.71 FnoL 2.05 FnoS 2.29 HFOVL [degree] 14.7 HFOVS [degree] 13.1 Object distance [millimeters] ∞ Object distance [millimeters] 118.665 D0 [millimeters] ∞ D0 [millimeters] 119.200 D1 [millimeters] 0.720 D1 [millimeters] 1.520

[0312] The definitions described in Table 9B are the same as those in the first embodiment. It should be understood that this embodiment only discloses the above two moving focus states, but this disclosure is not limited to the states disclosed above, and the imaging optical lens of this embodiment may have other moving focus states with different focal lengths between the first state and the second state in addition to the first state and the second state, so as to correspond to other focusing states with different object distances.

[0313] As shown in Table 9B, the imaging optical lens performs a focusing process based on changes in object distance. During the focusing process as the imaging optical lens transitions from the first state to the second state, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side. Specifically, when the object distance changes from infinity to 118.665 mm, the imaging optical lens transitions from the first state to the second state. The distance D1 between the moving lens group G1 and the final lens group G2 along the optical axis increases from 0.720 mm in the first state to 1.520 mm in the second state. However, the final lens group G2 does not move relative to the reflecting element E6 during the focusing process. In other words, as the object distance decreases, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side during the focusing process.

[0314] Table 9C, Aspheric Coefficient surface 2 3 5 6 k = -1.352640000E-02 -6.949330000E+01 1.701890000E-02 1.124840000E-02 A4 = 1.151633365E-03 3.849587079E-03 -3.307488865E-03 -1.53​​9937690E-02 A6 = -3.881562281E-04 -3.579998299E-03 -1.788225343E-03 5.118655055E-03 A8 = 4.550075071E-05 1.630895200E-03 -2.686545860E-03 -6.215266474E-03 A10 = 1.037645427E-05 -4.385625921E-04 4.121548750E-03 5.960146193E-03 A12 = -4.876070995E-06 7.235187289E-05 -2.818077764E-03 -3.897068063E-03 A14 = 7.548463499E-07 -7.465569339E-06 1.234670852E-03 1.823111163E-03 A16 = -5.732364084E-08 4.754586371E-07 -3.760249267E-04 -6.207341660E-04 A18 = 2.158856353E-09 -1.725062544E-08 8.033422361E-05 1.520270679E-04 A20 = -3.184553696E-11 2.747956099E-10 -1.186117918E-05 -2.628240075E-05 A22 = - - 1.172517145E-06 3.135223417E-06 A24 = - - -7.277057055E-08 -2.492552838E-07 A26 = - - 2.426175263E-09 1.240296661E-08 A28 = - - -2.167846969E-11 -3.400663608E-10 A30 = - - -6.077950262E-13 3.708006754E-12 Surface 7 8 9 10 k = -6.440900000E-01 2.725900000E-02 -1.929050000E+00 9.900000000E+01 A4 = 6.121597598E-02 5.201867947E-02 -1.210079426E-02 -1.171669913E-02 A6 = -1.759384282E-02 -3.663176913E-02 -3.185624169E-02 8.968394131E-04 A8 = 7.937780647E-03 3.084577474E-02 2.971021889E-02 -1.209134256E-02 A10 = -4.820034313E-03 -1.828385374E-02 -1.972616110E-02 1.617558355E-02 A12 = 2.984193340E-03 5.131876026E-03 1.004315556E-02 -1.154916747E-02 A14 = -1.464980635E-03 1.745858784E-03 -3.440526880E-03 5.369335864E-03 A16 = 5.377297516E-04 -2.573797755E-03 6.085935467E-04 -1.659527818E-03 A18 = -1.476285587E-04 1.346599897E-03 5.911971613E-05 3.222730355E-04 A20 = 3.026640492E-05 -4.291262697E-04 -7.153827581E-05 -2.984599265E-05 A22 = -4.558607988E-06 9.080473824E-05 2.211193701E-05 -2.091870516E-06 A24 = 4.873720631E-07 -1.285773860E-05 -3.875540885E-06 1.036920041E-06 A26 = -3.482765457E-08 1.173987745E-06 4.100874565E-07 -1.408648893E-07 A28 = 1.485185922E-09 -6.256350943E-08 -2.442397207E-08 9.343689989E-09 A30 = -2.848997344E-11 1.478642738E-09 6.295206363E-10 -2.565601849E-10 Surface 12 13 k = -4.184770000E+01 9.900000000E+01 A4 = 6.773424278E-03 9.949760211E-03 A6 = 7.065606659E-03 1.552603903E-03 A8 = -1.253934535E-02 5.691938584E-04 A10 = 1.119534828E-02 -8.221767211E-03 A12 = -4.953685729E-03 1.500024178E-02 A14 = -4.474275357E-04 -1.535507371E-02 A16 = 2.092541393E-03 1.033124511E-02 A18 = -1.435908202E-03 -4.813437848E-03 A20 = 5.618288687E-04 1.581608485E-03 A22 = -1.429759005E-04 -3.658180186E-04 A24 = 2.415308904E-05 5.829406843E-05 A26 = -2.625109025E-06 -6.090327695E-06 A28 = 1.667266566E-07 3.752647151E-07 A30 = -4.713591401E-09 -1.032726463E-08

[0315] In the ninth embodiment, the equation of the aspherical curve is expressed in the form of the first embodiment. Furthermore, the definitions described in Table 9D below are the same as those in the first embodiment, and will not be repeated here.

[0316] Table 9D, Polynomial Data fL [million millimeters] 13.43 fL / R5 -5.84 FnoL 2.05 |f3 / f2| 0.19 HFOVL [degree] 14.7 |R3 / fL| + |R4 / fL| 0.71 FOVL [degrees] 29.4 (R1 - R4) / (R1 + R4) 0.26 fS [mm] 12.71 (R1 - R5) / (R1 + R5) 1.71 FnoS 2.29 CT1 / CT2 1.74 HFOVS [degrees] 13.1 CT1 / Dr3r8L 0.42 FOVS [degrees] 26.2 T23L / CT4 ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​ 2.89 Sag2R1L / CT2 0.71 SDL / TDL 0.89 Y1R1L / Y5R2L 1.61 fL / f3 -1.64 Y1R1L / ImgH 0.91 T34L / CT2 0.20 -

[0317] <Tenth Embodiment>

[0318] Please refer to Figures 28 to 30, where Figure 28 shows schematic diagrams of the imaging device according to the tenth embodiment of this disclosure in a first state and a second state, Figure 29 shows, from left to right, the spherical aberration, astigmatism, and distortion curves of the imaging device of the tenth embodiment in the first state, and Figure 30 shows, from left to right, the spherical aberration, astigmatism, and distortion curves of the imaging device of the tenth embodiment in the second state. The upper half of Figure 28 is a schematic diagram of the imaging optical lens in the first state, and the lower half of Figure 28 is a schematic diagram of the imaging optical lens in the second state. As shown in Figure 28, the imaging device 10 includes an imaging optical lens (not otherwise labeled) and an electronic photosensitive element IS. The imaging optical lens, along the optical path direction from the object side to the image side, includes, in sequence, an aperture stop S1, a first lens E1, an aperture stop S2, a second lens E2, a third lens E3, a fourth lens E4, an aperture stop S3, a fifth lens E5, an aperture stop S4, a reflective element E6, a filter element E7, and an imaging surface IMG. Furthermore, the imaging optical lens, along the optical path direction from the object side to the image side, has a moving lens group G1 and a final lens group G2 in sequence. The moving lens group G1 includes an aperture stop S1, a first lens E1, an aperture stop S2, a second lens E2, a third lens E3, a fourth lens E4, and an aperture stop S3. The final lens group G2 includes a fifth lens E5 and an aperture stop S4. The electronic photosensitive element IS is disposed on the imaging plane IMG. The imaging optical lens comprises five lenses (E1, E2, E3, E4, E5), and there are no other interposed lenses between each lens. Additionally, there are no other lenses on the optical axis between the final lens group G2 and the reflecting element E6.

[0319] The imaging optical lens adjusts its focal length by changing the distance between two lens groups (G1, G2) during the focusing process. When the subject is at infinity, the imaging optical lens is in the first state shown in the upper half of Figure 28. When the subject is at a finite distance, the imaging optical lens is in the second state, for example, shown in the lower half of Figure 28. Specifically, when the subject moves from infinity to a finite distance, the imaging optical lens performs a focusing process to change from the first state to the second state. Conversely, when the subject moves from a finite distance to infinity, the imaging optical lens also performs a focusing process to change from the second state to the first state. The first state refers to the state of the imaging optical lens when the subject is at infinity; the second state refers to the state of the imaging optical lens when the subject is at a finite distance. As shown in Figure 28, the moving lens group G1 moves relative to the final lens group G2 along the optical axis during the focusing process. In this process, during the focusing motion of the imaging optical lens from its first state to its second state, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side. It should be noted that the elements in the moving lens group G1 (e.g., lenses, aperture stops, and / or diaphragms) do not move relative to each other during the focusing motion, and the elements in the final lens group G2 (e.g., lenses, aperture stops, and / or diaphragms) also do not move relative to each other during the focusing motion. Furthermore, during the focusing motion, the final lens group G2 does not move relative to the reflecting element E6.

[0320] The first lens E1 has positive refractive power and is made of glass. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are spherical.

[0321] The second lens E2 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has one inflection point, and its image-side surface has five inflection points. Its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0322] The third lens E3 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical, and its object-side surface has three inflection points.

[0323] The fourth lens E4 has positive refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has four inflection points, and its object-side surface has a critical point off-axis.

[0324] The fifth lens E5 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both surfaces are aspherical. Its object-side surface has a point of inflection, its image-side surface has a point of inflection, its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0325] The reflective element E6 is made of glass and is positioned between the fifth lens E5 and the imaging plane IMG along the optical axis, without affecting the focal length of the imaging lens. The reflective element E6 is a prism with a light path reversal function. For ease of explanation, Figure 28 does not show the reversal effect of the reflective element E6 on the light path. However, the reflective element E6 can have various forms depending on actual design requirements, thus creating different reversal effects on the light path. In this embodiment, the reflective element E6 can, for example, have a structure similar to Figures 53 to 58, as described above with reference to the corresponding figures 53 to 58, and will not be repeated here. Furthermore, the reflective element E6 in this embodiment can also, for example, have a structure similar to Figure 50, and can reversal the light path five times, as described above with reference to the corresponding figure 50, and will not be repeated here.

[0326] The filter element E7 is made of plastic and is located between the reflective element E6 and the imaging surface IMG. It does not affect the focal length of the imaging optical lens.

[0327] Please refer to Tables 10A to 10D below.

[0328] Table 10A, Tenth Embodiment surface radius of curvature thickness Material Refractive index Abbe number focal length 0 Subject flat D0 1 Aperture flat 0.030 2 First lens 6.9856 (SPH) 1.186 Glass 1.954 32.3 6.43 3 -45.8663 (SPH) 0.197 4 Aperture flat -0.157 5 Second lens 13.9263 (ASP) 0.381 plastic 1.551 44.8 15.80 6 -22.9539 (ASP) 0.446 7 Third lens -3.1529 (ASP) 0.590 plastic 1.614 25.6 -4.88 8 64.1808 (ASP) 0.450 9 Fourth lens -1523.7966 (ASP) 0.664 plastic 1.544 56.0 14.33 10 -7.7556 (ASP) -0.133 11 Aperture flat D1 12 Fifth lens -6.9592 (ASP) 0.343 plastic 1.656 21.3 -22.62 13 -13.3615 (ASP) 0.032 14 Aperture flat 0.446 15 Reflective element flat 14.032 Glass 1.835 42.7 - 16 flat 0.400 17 Filter element flat 0.210 plastic 1.517 64.2 - 18 flat 0.067 19 Imaging surface flat - The reference wavelength (d-line) is 587.6 nm. The effective radius of surface 1 (aperture S1) is 2.989 mm. The effective radius of surface 4 (aperture S2) is 2.738 mm. The effective radius of surface 11 (aperture S3) is 2.204 mm. The effective radius of surface 14 (aperture S4) is 1.987 mm. The imaging optical lens can further include an aperture, and the position of the aperture can be adjusted depending on the object distance. In this embodiment, when the imaging optical lens is in the first state (object distance at infinity), the aperture is located on surface 1. In this embodiment, when the imaging optical lens is in the second state (limited object distance), the aperture is located on surface 11.

[0329] In this embodiment, the imaging optical lens is in the second state with the subject located at a finite object distance of 119.233 mm as an example, but this disclosure is not limited to this.

[0330] Table 10B: Parameters of the imaging optical lens in the first and second states, respectively. First state (object distance at infinity) Second state (finite object distance) fL [millimeters] 13.49 fS [millimeters] 12.85 FnoL 2.26 FnoS 2.50 HFOVL [degree] 14.8 HFOVS [degree] 13.2 Object distance [millimeters] ∞ Object distance [millimeters] 119.233 D0 [millimeters] ∞ D0 [millimeters] 119.203 D1 [millimeters] 0.540 D1 [millimeters] 1.337

[0331] The definitions described in Table 10B are the same as those in the first embodiment. It should be understood that this embodiment only discloses the above two moving focus states, but this disclosure is not limited to the states disclosed above, and the imaging optical lens of this embodiment may have other moving focus states with different focal lengths between the first state and the second state in addition to the first state and the second state, so as to correspond to other focusing states with different object distances.

[0332] As shown in Table 10B, the imaging optical lens performs a focusing process based on changes in object distance. During the focusing process as the imaging optical lens transitions from the first state to the second state, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side. Specifically, when the object distance changes from infinity to 119.233 mm, the imaging optical lens transitions from the first state to the second state. The distance D1 between the moving lens group G1 and the final lens group G2 along the optical axis increases from 0.540 mm in the first state to 1.337 mm in the second state. However, the final lens group G2 does not move relative to the reflecting element E6 during the focusing process. In other words, as the object distance decreases, the moving lens group G1 moves relative to the final lens group G2 along the optical axis toward the object side during the focusing process.

[0333] Table 10C, Aspheric Coefficient surface 5 6 7 8 k = 0.000000000E+00 0.000000000E+00 -3.763160000E-01 0.000000000E+00 A4 = -9.469863639E-05 2.328110720E-02 1.244531986E-01 1.182313386E-01 A6 = 7.769224649E-03 1.668382326E-03 -1.016850475E-01 -9.721582141E-02 A8 = -1.384610344E-02 -2.017222496E-02 6.640937067E-02 5.498550647E-02 A10 = 1.264032258E-02 2.269253845E-02 -3.507276662E-02 -2.419374832E-02 A12 = -7.372618320E-03 -1.485980169E-02 1.481426489E-02 7.722914460E-03 A14 = 2.889798089E-03 6.445289511E-03 -4.754264528E-03 -7.246259637E-04 A16 = -7.727678781E-04 -1.899454814E-03 1.107509108E-03 -7.660384598E-04 A18 = 1.407409649E-04 3.798327314E-04 -1.813258674E-04 4.345984688E-04 A20 = -1.713337036E-05 -5.056035337E-05 2.021048420E-05 -1.115358209E-04 A22 = 1.331969689E-06 4.280347180E-06 -1.458655059E-06 1.582264197E-05 A24 = -5.973947970E-08 <000508%> -2.082951551E-07 6.157257003E-08 -1.197078795E-06 A26 = 1.175564463E-09 4.434250110E-09 -1.157999974E-09 3.774975132E-08 Surface 9 10 12 13 k = <00%5094> 0.000000000E+00 0.000000000E+00 0.000000000E+00 0.000000000E+00 A4 = 3.515033830E-02 5.908401865E-04 5.569932432E-03 9.565%65425E-03 A6 = -2.829950731E-02 7.079814293E-03 1.803837657E-02 It seems there are some incorrect tags in the original text like `<00%5094>` and `9.565%65425E-03` which should be corrected for accurate interpretation. The above translation is based on the given text with the best effort to maintain the integrity of the content including the tags.8.358844328E-03 A8 = 1.781065552E-02 -7.991290885E-03 -2.322032207E-02 -1.075557413E-02 A10 = -1.372816183E-02 9.720316795E-04 1.841979401E-02 8.912007153E-03 A12 = 7.919705678E-03 3.372927204E-03 -9.626817167E-03 -5.184392887E-03 A14 = -1.990654229E-03 -2.661234917E-03 3.268808729E-03 2.044477550E-03 A16 = -3.373702456E-04 9.459065098E-04 -6.889404632E-04 -5.283180454E-04 A18 = 3.827529589E-04 -1.750171737E-04 7.900321598E-05 8.524196159E-05 A20 = -1.156534184E-04 1.322281793E-05 -2.395597388E-06 -7.770724163E-06 A22 = 1.784081261E-05 7.263173936E-07 -4.093602631E-07 3.051880166E-07 A24 = -1.428449022E-06 -1.969977466E-07 3.296119319E-08 - A26 = 4.713882565E-08 9.928574266E-09 - -

[0334] In the tenth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in Table 10D below are the same as in the first embodiment and will not be repeated here.

[0335] Table 10D, Polynomial Data fL [millimeters] 13.49 fL / R5 -4.28 FnoL 2.26 |f3 / f2| 0.31 HFOVL [degree] 14.8 |R3 / fL|+|R4 / fL| 2.73 FOVL [degree] 29.6 (R1-R4) / (R1+R4) -1.87 fS [millimeters] 12.85 (R1-R5) / (R1+R5) 2.65 FnoS 2.50 CT1 / CT2 3.11 HFOVS [degrees] 13.2 CT1 / Dr3r8L 0.47 FOVS [degrees] 26.4 T23L / CT4 0.67 TLS / TLL 1.040 10×T45L / fL 0.30 fL / fG1 1.40 CT5 / T45L 0.84 |TDS-TDL| [mm] 0.80 N1 1.954 10×|TDS-TDL| / TDL 1.77 V5 21.3 DG2 / DG1 0.09 <s V5 / N5 12.86 TLL / fL 1.46 ET12L / CT2 0.80 BLL / TDL 3.37 Sag2R1L / CT2 0.45 SDL / TDL 1.01 Y1R1L / Y5R2L 1.50 fL / f3 -2.76 Y1R1L / ImgH 0.83 T34L / CT2 1.18 - -

[0336] <Eleventh Embodiment>

[0337] Please refer to Figure 31, which is a perspective view of an image capturing device according to the eleventh embodiment of this disclosure. In this embodiment, the image capturing device 100 is a camera module. The image capturing device 100 includes an imaging lens 101, a driving device 102, an electronic photosensitive element 103, and an image stabilization module 104. The imaging lens 101 includes the imaging optical lens of the first embodiment described above, a lens barrel (not otherwise labeled) for carrying the imaging optical lens, and a support device (Holder Member, not otherwise labeled). The imaging lens 101 can also be replaced with imaging optical lenses of other embodiments described above, and this disclosure is not limited thereto. The image capturing device 100 uses the imaging lens 101 to focus light to generate an image, and cooperates with the driving device 102 to focus the image, finally imaging it on the electronic photosensitive element 103 and outputting it as image data.

[0338] The driving device 102 may have an auto-focus function, and its driving method may include, but is not limited to, a screw, voice coil motor (VCM), microelectromechanical system (MEMS), piezoelectric system, shape memory alloy, spring type, or ball type driving system. The driving device 102 enables the imaging lens 101 to achieve a better imaging position, allowing clear images to be captured of the subject at different object distances. In addition, the image capturing device 100 is equipped with a high-sensitivity and low-noise electronic image sensor 103 (such as CMOS or CCD) located on the imaging surface of the imaging optical lens, which can truly present the good image quality of the imaging optical lens.

[0339] The image stabilization module 104 can be, for example, an accelerometer, a gyroscope, or a Hall effect sensor. The drive unit 102 can work in conjunction with the image stabilization module 104 to form an optical image stabilization (OIS) device. By adjusting the changes in different axes of the imaging lens 101, it can compensate for the blurry image caused by shaking during shooting, or use image compensation technology in the imaging software to provide electronic image stabilization (EIS) function, further improving the image quality of shooting in dynamic and low-light scenes.

[0340] <Twelfth Embodiment>

[0341] Please refer to Figures 32 to 34, wherein Figure 32 shows a perspective view of one side of an electronic device according to the twelfth embodiment of the present disclosure, Figure 33 shows a perspective view of the other side of the electronic device of Figure 32, and Figure 34 shows a system block diagram of the electronic device of Figure 32.

[0342] In this embodiment, the electronic device 200 is a smartphone. The electronic device 200 includes, according to the eleventh embodiment, image capturing devices 100, 100a, 100b, 100c, 100d, and 100e, a flash module 201, a focus assist module 202, an image signal processor 203, a display module 204, and an image software processor 205. Image capturing devices 100, 100a, and 100b are all located on the same side of the electronic device 200 and are all single-focus. The focus assist module 202 may employ a laser ranging or a Time-of-Flight (ToF) module, but this disclosure is not limited to these. Image capturing devices 100c, 100d, 100e, and display module 204 are all disposed on the other side of electronic device 200, and display module 204 can serve as a user interface, allowing image capturing devices 100c, 100d, and 100e to function as front-facing lenses for selfies, but this disclosure is not limited thereto. Furthermore, image capturing devices 100a, 100b, 100c, 100d, and 100e can all include the imaging optical lens disclosed herein and can all have a structural configuration similar to that of image capturing device 100. Specifically, each of image capturing devices 100a, 100b, 100c, 100d, and 100e can include an imaging lens, a driving device, an electronic photosensitive element, and an image stabilization module, and each can include a reflective element as a component for deflecting the light path. The imaging lenses of imaging devices 100a, 100b, 100c, 100d and 100e may each include, for example, the imaging optical lens disclosed herein, a lens barrel for carrying the imaging optical lens and a support device.

[0343] Image capturing device 100 is a telescopic image capturing device with a reversible optical path. Image capturing device 100a is a wide-angle image capturing device, image capturing device 100b is an ultra-wide-angle image capturing device, image capturing device 100c is a wide-angle image capturing device, image capturing device 100d is an ultra-wide-angle image capturing device, and image capturing device 100e is a time-of-flight ranging image capturing device. In this embodiment, image capturing devices 100, 100a, and 100b have different viewing angles, allowing the electronic device 200 to provide different magnifications to achieve optical zoom shooting effects. In addition, image capturing device 100e can acquire depth information of the image. The optical path reversal configuration of image capturing device 100 can, for example, have a structure similar to that shown in Figures 42 to 52, which can be referred to in the description corresponding to Figures 42 to 52 above, and will not be repeated here. Furthermore, the image capturing devices 100a, 100b, 100c, 100d, and 100e may also have an optical path reversal configuration, and may also have a structure similar to that of Figures 42 to 52, as described above with reference to the descriptions corresponding to Figures 42 to 52. The above-described electronic device 200 is exemplified by including multiple image capturing devices 100, 100a, 100b, 100c, 100d, and 100e, but the number and configuration of the image capturing devices are not intended to limit this disclosure.

[0344] When the user photographs the subject 206, the electronic device 200 uses the image capturing device 100, image capturing device 100a, or image capturing device 100b to focus the light and activate the flash module 201 for supplemental lighting. It also uses the subject distance information provided by the focus assist module 202 for fast focusing, and the image signal processor 203 performs image optimization processing to further improve the image quality produced by the imaging lens. The focus assist module 202 can use an infrared or laser focus assist system to achieve fast focusing. Furthermore, the electronic device 200 can also use the image capturing device 100c, image capturing device 100d, or image capturing device 100e for shooting. The display module 204 can use a touch screen and, in conjunction with the diverse functions of the image software processor 205, can perform image shooting and image processing (or can use a physical shooting button). The image processed by the image software processor 205 can be displayed on the display module 204.

[0345] <Thirteenth Embodiment>

[0346] Please refer to Figures 35 and 36, wherein Figure 35 shows a schematic diagram of one side of an electronic device according to the thirteenth embodiment of the present disclosure, and Figure 36 shows a schematic diagram of the other side of the electronic device of Figure 35.

[0347] In this embodiment, the electronic device 300 is a smartphone. The electronic device 300 includes the image capturing device 100, image capturing device 100f, image capturing device 100g, image capturing device 100h, and display module 304 of the eleventh embodiment. As shown in FIG35, image capturing devices 100, 100f, and 100g are all disposed on the same side of the electronic device 300 and are all single-focus. As shown in FIG36, image capturing device 100h and display module 304 are both disposed on the other side of the electronic device 300. Image capturing device 100h can serve as a front-facing camera to provide a selfie function, but this disclosure is not limited thereto. Furthermore, image capturing devices 100f, 100g, and 100h can all include the imaging optical lens disclosed herein and can all have a structural configuration similar to that of image capturing device 100. In detail, each of the imaging devices 100f, 100g, and 100h may include an imaging lens, a driving device, an electronic photosensitive element, and an image stabilization module. The imaging lens of each of the imaging devices 100f, 100g, and 100h may include, for example, an imaging optical lens as disclosed herein, a lens barrel for supporting the imaging optical lens, and a support device.

[0348] Image capturing device 100 is a telephoto image capturing device, image capturing device 100f is a wide-angle image capturing device, image capturing device 100g is an ultra-wide-angle image capturing device, and image capturing device 100h is a wide-angle image capturing device. In this embodiment, image capturing devices 100, 100f, and 100g have different viewing angles, allowing the electronic device 300 to provide different magnifications to achieve optical zoom shooting effects. Furthermore, as shown in Figure 36, the opening of image capturing device 100h can be non-circular, and the lens barrel or lens inside image capturing device 100h can be cut at its outer diameter to have a chamfered edge to match the non-circular opening. This allows for a further reduction in the single-axis length of image capturing device 100h, facilitating a reduction in lens volume, increasing the area ratio of display module 304 relative to electronic device 300, and reducing the thickness of electronic device 300, further achieving module miniaturization. Among them, at least one lens, after being cut at its outer diameter, can have a non-circular optical effective area. The above-described electronic device 300 is exemplified by including multiple image-capturing devices 100, 100f, 100g, and 100h, but the number and configuration of the image-capturing devices are not intended to limit this disclosure.

[0349] <Fourteenth Embodiment>

[0350] Please refer to Figure 37, which is a perspective view of one side of an electronic device according to the fourteenth embodiment of this disclosure.

[0351] In this embodiment, the electronic device 400 is a smartphone. The electronic device 400 includes, in the eleventh embodiment, image capturing devices 100i, 100j, 100k, 100m, 100n, 100p, 100q, and 100r, a flash module 401, a focus assist module, an image signal processor, a display module, and an image software processor (not shown). Image capturing devices 100i, 100j, 100k, 100m, 100n, 100p, 100q, and 100r are all located on the same side of the electronic device 400, while the display module is located on the other side of the electronic device 400. Furthermore, the imaging devices 100i, 100j, 100k, 100m, 100n, 100p, 100q, and 100r may all include the imaging optical lens disclosed herein and may all have a structural configuration similar to that of the imaging device 100, which will not be described in detail here.

[0352] Image capturing device 100 is a telescopic image capturing device with a reversible optical path; image capturing device 100i is a telescopic image capturing device with a reversible optical path; image capturing device 100j is a wide-angle image capturing device; image capturing device 100k is a wide-angle image capturing device; image capturing device 100m is an ultra-wide-angle image capturing device; image capturing device 100n is an ultra-wide-angle image capturing device; image capturing device 100p is a telescopic image capturing device; image capturing device 100q is a telescopic image capturing device; and image capturing device 100r is a time-of-flight ranging image capturing device. In this embodiment, image capturing devices 100, 100i, 100j, 100k, 100m, 100n, 100p, and 100q have different viewing angles, allowing the electronic device 400 to provide different magnifications to achieve optical zoom shooting effects. Furthermore, the image capturing device 100r can acquire depth information of the image. The optical path reversal configuration of the image capturing devices 100 and 100i can, for example, have a structure similar to that shown in Figures 42 to 52, as described above with reference to the corresponding figures 42 to 52, and will not be repeated here. The electronic device 400 described above is exemplified by including multiple image capturing devices 100, 100i, 100j, 100k, 100m, 100n, 100p, 100q, and 100r, but the number and configuration of the image capturing devices are not intended to limit this disclosure. When a user takes a picture of the subject, the electronic device 400 uses the image capturing device 100, image capturing device 100i, image capturing device 100j, image capturing device 100k, image capturing device 100m, image capturing device 100n, image capturing device 100p, image capturing device 100q or image capturing device 100r to focus the light and activate the flash module 401 to provide supplementary lighting. The subsequent processing is performed in a manner similar to that described in the previous embodiment, which will not be repeated here.

[0353] The image capturing device disclosed herein is not limited to smartphones. It can also be applied to mobile focusing systems as needed, offering excellent aberration correction and good image quality. For example, the image capturing device can be widely used in 3D image capture, digital cameras, mobile products, digital tablets, smart TVs, network surveillance equipment, dashcams, reversing cameras, multi-lens devices, recognition systems, motion-sensing game consoles, drones, wearable products, and personal video recorders. The aforementioned electronic devices are merely illustrative examples of practical applications of this disclosure and do not limit the scope of application of the image capturing device disclosed herein.

[0354] Although this disclosure is based on the preferred embodiments described above, it is not intended to limit this disclosure. Anyone skilled in the art may make some modifications and refinements without departing from the spirit and scope of this disclosure. Therefore, the scope of patent protection of this disclosure shall be determined by the claims attached to this specification.

[0355] 1,2,3,4,5,6,7,8,9,10,100,100a,100b,100c,100d,100e,100f,100g,100h,100i,100j,100k,100m,100n,100p,100q,100r: imaging device 101: Imaging Lens 102: Drive unit 103: Electronic photosensitive element 104: Image Stabilization Module 200, 300, 400: Electronic devices 201,401: Flash module 202: Focusing Assist Module 203: Image Signal Processor 204, 304: Display module 205: Image Software Processor 206: Subject C: Critical point P: Inversion point D0, D1: Distance S1, S2, S3, S4: Aperture E1: First lens E2: Second lens E3: Third Lens E4: Fourth Lens E5: Fifth Lens E6: Reflective element E7: Filter element IMG: Imaging Surface IS: Electronic photosensitive element G1: Moving lens group G2: The final lens group LG: Lens Group LF, LF1, LF2: Reflective elements FT: Filter element LP1, LP2: Penetration surfaces RF1, RF2, RF3, RF4, RF5: Reflecting surfaces OA, OA1, OA2, OA3, OA4, OA5, OA6: Optical axes ST: Aperture LX: Long Wheelbase SY: Short axis Ra,Rb: Effective radius NPR: Non-optical effective path region CP: Cutting edge RP: Groove BLL: The distance on the optical axis from the image-side surface of the lens closest to the image side in the first state of the imaging lens. CT1: Thickness of the first lens on the optical axis CT2: Thickness of the second lens on the optical axis CT4: Thickness of the fourth lens on the optical axis CT5: Thickness of the fifth lens on the optical axis DG1: The distance on the optical axis from the object-side surface of the lens closest to the object side in the moving lens group to the image-side surface of the lens closest to the image side in the moving lens group. DG2: The distance on the optical axis from the object-side surface of the lens closest to the object side in the last lens group to the image-side surface of the lens closest to the image side in the last lens group. Dr3r8L: The distance on the optical axis between the object-side surface of the second lens and the image-side surface of the fourth lens when the imaging optical lens is in its first state. ET12L: The distance between the maximum effective radius of the image-side surface of the first lens and the maximum effective radius of the object-side surface of the second lens, parallel to the optical axis, in the first state of the imaging optical lens. f2: Focal length of the second lens f3: Focal length of the third lens fG1: Focal length of the moving lens group fL: Focal length of the imaging optical lens in the first state. fS: Focal length of the imaging lens in the second state. FnoL: Aperture value of the imaging optical lens in its first state. FnoS: Aperture value of the imaging optical lens in its second state. FOVL: The maximum angle of view of an imaging lens in its first state. FOVS: Maximum angle of view of the imaging lens in its second state. HFOVL: Half of the maximum angle of view of the imaging lens in its first state. HFOVS: Half of the maximum angle of view of the imaging lens in its second state. ImgH: Maximum imaging height of the imaging optical lens N1: Refractive index of the first lens N5: Refractive index of the fifth lens R1: Radius of curvature of the object-side surface of the first lens R3: Radius of curvature of the object-side surface of the second lens R4: Radius of curvature of the image-side surface of the second lens R5: Radius of curvature of the object-side surface of the third lens Sag2R1L: The displacement parallel to the optical axis from the point where the object-side surface of the second lens intersects the optical axis to the position of the maximum effective radius of the object-side surface of the second lens when the imaging optical lens is in its first state. SDL: The distance on the optical axis of the lens whose image-side surface is closest to the image side when the aperture of the imaging optical lens is in its first state. T23L: The distance between the second and third lenses on the optical axis of the imaging optical lens in the first state. T34L: The distance between the third and fourth lenses on the optical axis of the imaging optical lens in its first state. T45L: The distance between the fourth and fifth lenses on the optical axis of the imaging optical lens in the first state. TDL: The distance on the optical axis between the object-side surface of the lens closest to the object side and the image-side surface of the lens closest to the image side in the first state of the imaging optical lens. TDS: The distance on the optical axis between the object-side surface of the lens closest to the object side and the image-side surface of the lens closest to the image side in the second state of an imaging optical lens. TLS: The distance along the optical axis from the object-side surface of the lens closest to the object side to the imaging plane in the second state of the imaging lens. TLL: The distance along the optical axis from the object-side surface of the lens closest to the object side in the first state of the imaging lens. V5: Abbe number of the fifth lens Y1R1L: The maximum effective radius of the object-side surface of the first lens when the imaging optical lens is in the first state. Y5R2L: The maximum effective radius of the image-side surface of the fifth lens of the imaging optical lens in the first state.

Claims

1. An imaging optical lens comprising five lenses, which are sequentially arranged from the object side to the image side along the optical path direction as a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, and each of the five lenses has an object-side surface facing the object side and an image-side surface facing the image side; wherein, The imaging optical lens has a total of five lenses. The first lens has positive refractive power and its object-side surface is convex near the optical axis. The second lens has a convex object-side surface near the optical axis and a concave image-side surface near the optical axis. The third lens has negative refractive power and its object-side surface is concave near the optical axis. The fourth lens has positive refractive power, and at least one surface of at least one lens in the imaging optical lens has at least one inversion point. Wherein, when the subject is located at an infinity object distance, the imaging optical lens is in a first state; and wherein, in the first state, the distance on the optical axis from the image-side surface of the lens closest to the image side to an imaging plane is BLL, the distance on the optical axis from the object-side surface of the lens closest to the object side to the image-side surface of the lens closest to the image side is TDL, the radius of curvature of the object-side surface of the first lens is R1, the radius of curvature of the object-side surface of the third lens is R5, the focal length of the second lens is f2, and the focal length of the third lens is f3, which satisfy the following conditions: 2.00 < BLL / TDL < 5.50; -0.50 < (R1-R5) / (R1+R5) < 5.00; and 0 < |f3 / f2| < 1.

00.

2. An imaging optical lens as described in claim 1, wherein in the first state, the distance on the optical axis from the image-side surface of the lens closest to the image side to the imaging surface is BLL, and the distance on the optical axis from the object-side surface of the lens closest to the object side to the image-side surface of the lens closest to the image side is TDL, which satisfies the following condition: 2.30 < BLL / TDL < 4.

50.

3. An imaging optical lens as described in claim 1, wherein the focal length of the second lens is f2 and the focal length of the third lens is f3, satisfying the following condition: 0 < |f3 / f2| < 0.

80.

4. The imaging optical lens as described in claim 1, wherein the fifth lens has negative refractive power; and wherein, The radius of curvature of the object-side surface of the first lens is R1, and the radius of curvature of the object-side surface of the third lens is R5, which satisfy the following condition: 0.50 < (R1-R5) / (R1+R5) < 4.

50.

5. An imaging optical lens as claimed in claim 1, wherein in the first state, the distance on the optical axis from the object-side surface of the lens closest to the object side to the imaging surface is TLL, the focal length of the imaging optical lens in the first state is fL, and the distance on the optical axis between the fourth lens and the fifth lens in the first state is T45L, which satisfies the following conditions: 1.30 < TLL / fL < 1.70; and 0.12 < 10 × T45L / fL < 1.

00.

6. An imaging optical lens as claimed in claim 1, wherein the focal length of the imaging optical lens in the first state is fL, and the focal length of the third lens is f3, which satisfies the following condition: -3.00 < fL / f3 < -1.

00.

7. An imaging optical lens as claimed in claim 1, wherein the radius of curvature of the object-side surface of the first lens is R1, the radius of curvature of the image-side surface of the second lens is R4, and the Abbe number of the fifth lens is V5, which satisfies the following conditions: -1.00 < (R1-R4) / (R1+R4) < 1.50; and 5.0 < V5 < 30.

0.

8. An imaging optical lens as claimed in claim 1, wherein in the first state, the distance between the second lens and the third lens on the optical axis is T23L, and the thickness of the fourth lens on the optical axis is CT4, which satisfies the following condition: 0.65 < T23L / CT4 < 2.

50.

9. An imaging optical lens as claimed in claim 1, wherein half of the maximum angle of view of the imaging optical lens in the first state is HFOVL, the maximum effective radius of the object-side surface of the first lens in the first state is Y1R1L, the maximum effective radius of the image-side surface of the fifth lens in the first state is Y5R2L, and the maximum imaging height of the imaging optical lens is ImgH, which satisfies the following conditions: 8.0 degrees < HFOVL < 20.0 degrees; 1.30 < Y1R1L / Y5R2L < 1.80; and 0.65 < Y1R1L / ImgH < 1.

20.

10. An imaging device comprising: an imaging optical lens as described in claim 1; and an electronic photosensitive element disposed on the imaging surface of the imaging optical lens.

11. An electronic device comprising: an image capturing device as described in claim 10.

12. An imaging optical lens comprising five lenses, which are sequentially arranged from the object side to the image side along the optical path direction as a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, and each of the five lenses has an object-side surface facing the object side and an image-side surface facing the image side; wherein, The imaging optical lens has a total of five lenses. The first lens has positive refractive power and its object-side surface is convex near the optical axis. The second lens has a convex object-side surface near the optical axis. The third lens has negative refractive power and its object-side surface is concave near the optical axis. The fourth lens has positive refractive power. At least one surface of at least one lens in the imaging optical lens has at least one inversion point. In this configuration, when the subject is at infinity, the imaging optical lens is in a first state. In this first state, the distance on the optical axis from the image-side surface of the lens closest to the image side to an imaging plane is BLL; the distance on the optical axis from the object-side surface of the lens closest to the object side to the image-side surface of the lens closest to the image side is TDL; the refractive index of the first lens is N1; the refractive index of the fifth lens is N5; the Abbe number of the fifth lens is V5; the thickness of the fifth lens on the optical axis is CT5; and the optical axis spacing between the fourth and fifth lenses in this first state is T45L, satisfying the following conditions: 2.00 < BLL / TDL < 5.50; 1.750 < N1 < 2.200; 5.00 < V5 / N5 < 15.20; and 0.10 < CT5 / T45L < 3.

00.

13. An imaging optical lens as claimed in claim 12, wherein the aperture value of the imaging optical lens in the first state is FnoL, the thickness of the fifth lens on the optical axis is CT5, and the distance between the fourth lens and the fifth lens on the optical axis in the first state is T45L, which satisfies the following conditions: 1.80 < FnoL < 2.50; and 0.15 < CT5 / T45L < 2.

00.

14. An imaging optical lens as claimed in claim 12, wherein the thickness of the first lens on the optical axis is CT1, the thickness of the second lens on the optical axis is CT2, the focal length of the imaging optical lens in the first state is fL, and the radius of curvature of the object-side surface of the third lens is R5, which satisfies the following conditions: 0.50 < CT1 / CT2 < 2.20; and -9.00 < fL / R5 < -2.

00.

15. The imaging optical lens as claimed in claim 12, wherein the second lens has positive refractive power; and wherein, The second lens has an object-side surface radius of curvature of R3 and an image-side surface radius of curvature of R4. The imaging optical lens has a focal length of fL in the first state, which satisfies the following condition: 0.20 < |R3 / fL| + |R4 / fL| < 2.

20.

16. The imaging optical lens as described in claim 12, wherein the first lens is made of glass; and wherein, The refractive index of the first lens is N1, which satisfies the following condition: 1.800 < N1 < 2.

100.

17. The imaging optical lens as claimed in claim 12 further includes an aperture, wherein, in the first state, the distance from the aperture to the image-side surface of the lens closest to the image side on the optical axis is SDL, and the distance from the object-side surface of the lens closest to the object side to the image-side surface of the lens closest to the image side on the optical axis is TDL, which satisfies the following condition: 0.87 < SDL / TDL < 1.

20.

18. An imaging optical lens as claimed in claim 12, wherein at least one surface of at least one lens in the imaging optical lens has at least one critical point off-axis; and wherein, In the first state, the optical lens used for imaging has a distance of T34L between the third lens and the fourth lens on the optical axis, and a thickness of CT2 on the optical axis, which satisfies the following condition: 0.80 < T34L / CT2 < 2.

00.

19. An imaging optical lens as claimed in claim 12, wherein, in the first state, the displacement of the point where the object-side surface of the second lens intersects the optical axis with respect to the maximum effective radius position of the object-side surface of the second lens is Sag2R1L, the thickness of the second lens on the optical axis is CT2, and the distance between the maximum effective radius position of the image-side surface of the first lens and the maximum effective radius position of the object-side surface of the second lens parallel to the optical axis in the first state is ET12L, which satisfies the following conditions: 0.40 < Sag2R1L / CT2 < 1.20; and 0.70 < ET12L / CT2 < 1.

50.

20. An imaging optical lens as claimed in claim 12, wherein, in the first state, the distance on the optical axis from the image-side surface of the lens closest to the image side to the imaging plane is BLL; the distance on the optical axis from the object-side surface of the lens closest to the object side to the image-side surface of the lens closest to the image side is TDL; the radius of curvature of the object-side surface of the first lens is R1; the radius of curvature of the object-side surface of the third lens is R5; the focal length of the imaging optical lens in the first state is fL; the focal length of the second lens is f2; the focal length of the third lens is f3; the refractive index of the first lens is N1; the refractive index of the fifth lens is N5; the Abbe number of the fifth lens is V5; the thickness of the fifth lens on the optical axis is CT5; and the distance on the optical axis between the fourth and fifth lenses in the first state is T45L, satisfying the following condition: 2.67 ≤ BLL / TDL ≤ 3.76; 1.36 ≤ (R1-R5) / (R1+R5) ≤ 3.46; 0.02 ≤ |f3 / f2| ≤ 0.40; 1.883 ≤ N1 ≤ 1.954; 10.91 ≤ V5 / N5 ≤ 14.34; 0.30 ≤ CT5 / T45L ≤ 0.87; and -2.76 ≤ fL / f3 ≤ -1.

48.

21. An imaging optical lens, comprising, sequentially from an object side to an image side along an optical path direction, a movable lens group and a final lens group, the movable lens group comprising at least one lens, the final lens group comprising at least one lens, and the lenses in the imaging optical lens respectively having an object-side surface facing the object side and an image-side surface facing the image side; wherein, When the subject is at infinity, the imaging optical lens is in a first state; when the subject is at a finite object distance, the imaging optical lens is in a second state; when the subject moves from infinity to a finite object distance, the imaging optical lens performs a focusing process to change from the first state to the second state; the moving lens group moves relative to the last lens group along the optical axis during the focusing process when the imaging optical lens changes from the first state to the second state. The moving lens group comprises four lenses, and the final lens group comprises one lens. The object-side surface of the imaging optical lens closest to the object side is convex near the optical axis, and at least one surface of at least one lens in the imaging optical lens has at least one inflection point. In the first state, the distance from the image-side surface of the lens closest to the image side to an imaging plane on the optical axis is BLL, the distance from the object-side surface of the lens closest to the object side to the image-side surface of the lens closest to the image side on the optical axis is TDL, and the aperture value of the imaging optical lens in the first state is FnoL, which satisfies the following conditions: 2.00 < BLL / TDL < 5.50; and 1.80 < FnoL < 2.

50.

22. The imaging optical lens as described in claim 21, wherein, The focal length of the imaging optical lens in the first state is fL, the focal length of the movable lens group is fG1, the distance on the optical axis between the object-side surface of the lens closest to the object side and the image-side surface of the lens closest to the image side in the second state is TDS, and the distance on the optical axis between the object-side surface of the lens closest to the object side and the image-side surface of the lens closest to the image side in the first state is TDL, which satisfies the following conditions: 0.80 < fL / fG1 < 1.80; and 0.30 mm < |TDS-TDL| < 1.10 mm.

23. An imaging optical lens as claimed in claim 21, wherein the distance on the optical axis from the object-side surface of the lens closest to the object side in the moving lens group to the image-side surface of the lens closest to the image side in the moving lens group is DG1, and the distance on the optical axis from the object-side surface of the lens closest to the object side in the last lens group to the image-side surface of the lens closest to the image side in the last lens group is DG2, which satisfies the following condition: 0.01 < DG2 / DG1 < 0.

40.

24. An imaging optical lens as claimed in claim 21, wherein in the second state, the distance on the optical axis from the object-side surface of the lens closest to the object side to the image-side surface of the lens closest to the image side is TDS, in the first state, the distance on the optical axis from the object-side surface of the lens closest to the object side to the image-side surface of the lens closest to the image side is TDL, in the second state, the distance on the optical axis from the object-side surface of the lens closest to the object side to the imaging plane is TLS, and in the first state, the distance on the optical axis from the object-side surface of the lens closest to the object side to the imaging plane is TLL, which satisfies the following conditions: 1.00 < 10 × |TDS-TDL| / TDL < 2.50; and 1.025 < TLS / TLL < 1.

100.

25. The imaging optical lens as claimed in claim 21 further comprises a reflecting element, wherein the reflecting element is located between the final lens group and the imaging plane along the optical path direction, and there are no other lenses between the final lens group and the reflecting element on the optical axis; and wherein, During this focusing process, the final lens group does not move relative to the reflecting element.

26. An imaging optical lens as claimed in claim 21, wherein the imaging optical lens comprises five lenses, which are sequentially arranged from the object side to the image side along the optical path direction as a first lens, a second lens, a third lens, a fourth lens, and a fifth lens; a movable lens group comprises the first lens, the second lens, the third lens, and the fourth lens; a final lens group comprises the fifth lens; the lenses in the movable lens group do not move relative to each other during the moving focusing process; the lenses in the final lens group do not move relative to each other during the moving focusing process; and the first lens has positive refractive power.

27. The imaging optical lens as claimed in claim 26, wherein the object-side surface of the second lens is convex near the optical axis, the object-side surface of the third lens is concave near the optical axis, and the third lens has negative refractive power.

28. The imaging optical lens as claimed in claim 26, wherein the fourth lens has positive refractive power; and wherein, The thickness of the first lens on the optical axis is CT1, and the distance on the optical axis between the object-side surface of the second lens and the image-side surface of the fourth lens in the first state is Dr3r8L, which satisfies the following condition: 0.15 < CT1 / Dr3r8L < 0.

65.

29. The imaging optical lens as claimed in claim 21 further includes a prism located between the last lens group and the imaging plane along the optical path direction, and the prism has at least two reflective surfaces.

30. The imaging optical lens as claimed in claim 29, wherein the prism further comprises a first transmitting surface, and the at least two reflecting surfaces of the prism sequentially include a first reflecting surface and a second reflecting surface along the optical path direction from the object side to the image side, and the first transmitting surface, the first reflecting surface, and the second reflecting surface are arranged sequentially along the optical path direction from the object side to the image side; and wherein, The first penetrating surface and the second reflecting surface are located on the same plane.

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