Photography optical system and image capturing unit

Abstract

A camera optical system assembly sequentially comprises a first lens group, an aperture, and a second lens group. The first lens group has one to three lenses in total, including a first lens closest to the object side. The second lens group has five to eight lenses in total, including a last lens closest to the image side. The camera optical system assembly further includes a second, a third, a fourth, and a fifth lens between the first and last lenses. The first lens group has positive refractive power, and the second lens group has negative refractive power. The object-side surface of the second lens is convex near the optical axis. The object-side surface of the third lens is convex near the optical axis, and the image-side surface of the third lens is concave near the optical axis. Under certain conditions, the camera optical system assembly can simultaneously meet the requirements of telephoto range, miniaturization, and high image quality.

Description

Technical Field

[0001] This disclosure relates to a camera optical system assembly and an image capturing device, and more particularly to a camera optical system assembly suitable for an image capturing device. 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] With the rapid advancement 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 balance requirements such as image quality, sensitivity, aperture size, size, and angle of view, this invention provides an optical lens with an ultra-long focal length, internal focusing capability, and high image quality to meet these needs. Summary of the Invention

[0004] This disclosure provides a camera optical system assembly and an image capturing device. The camera optical system assembly, arranged sequentially from the object side to the image side along the optical path, includes a first lens group, an aperture, and a second lens group. Under certain conditions, the camera optical system assembly provided by this disclosure can simultaneously meet the requirements of telephoto capability, miniaturization, and high image quality.

[0005] This disclosure provides a camera optical system assembly comprising, sequentially from the object side to the image side, a first lens group, an aperture, and a second lens group along the optical path, wherein all lenses in the camera optical system assembly have an object-side surface facing the object side and an image-side surface facing the image side. Preferably, the first lens group has one to three lenses. Preferably, the second lens group has five to eight lenses. Preferably, there are no other interposed lenses between the first and second lens groups. Preferably, the first lens group includes a first lens closest to the object side. Preferably, the second lens group includes a last lens closest to the image side. Preferably, the camera optical system assembly further comprises a second lens, a third lens, a fourth lens, and a fifth lens sequentially between the first and last lenses along the optical path, and there are no other interposed lenses between the first and fifth lenses. Preferably, the first lens group has positive refractive power. Preferably, the second lens group has negative 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 object-side surface of the third lens is convex near the optical axis. Preferably, the image-side surface of the third lens is concave near the optical axis. Preferably, at least one of the fifth lens and the sixth lens from the object side in the imaging optical system assembly is a negative lens. The total focal length of the imaging optical system assembly at an infinity object distance is fL, the focal length of the i-th lens from the object side in the imaging optical system assembly is fi, the minimum value of fL / fi is MIN(fL / fi), the radius of curvature of the object-side surface of the third lens is R5, the radius of curvature of the image-side surface of the third lens is R6, the maximum distance between all adjacent lenses on the optical axis at an infinity object distance in the imaging optical system assembly is ATLmax, and the maximum imaging height of the imaging optical system assembly is ImgH, which preferably satisfies the following conditions:

[0006] -13.80 < MIN(fL / fi) < -3.80, where i is a positive integer and 1 ≤ i ≤ the total number of lenses in the camera optical system group;

[0007] 0 < (R5+R6) / fL < 3.50; and

[0008] 1.00 < ATLmax / ImgH < 6.00.

[0009] This disclosure also provides a camera optical system assembly, which sequentially includes a first lens group, an aperture, and a second lens group along the optical path from the object side to the image side, and all lenses in the camera optical system assembly have an object-side surface facing the object side and an image-side surface facing the image side. Preferably, the first lens group has one to three lenses. Preferably, the second lens group has five to eight lenses. Preferably, there are no other interposed lenses between the first and second lens groups. Preferably, the first lens group includes a first lens closest to the object side. Preferably, the second lens group includes a last lens closest to the image side. Preferably, the camera optical system assembly further includes a second lens, a third lens, a fourth lens, and a fifth lens sequentially between the first and last lenses along the optical path, and there are no other interposed lenses between the first and fifth lenses. Preferably, the first lens group has positive refractive power. Preferably, the second lens group has negative 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 object-side surface of the third lens is convex near the optical axis. Preferably, the image-side surface of the third lens is concave near the optical axis. Preferably, the object-side surface of the fourth lens is convex near the optical axis. The total focal length of the imaging optical system group at the corresponding infinity object distance is fL, the focal length of the i-th lens in the imaging optical system group from the object side is fi, the minimum value of fL / fi is MIN(fL / fi), the focal length of the first lens group is fA1, the maximum single lens thickness on the optical axis among all lenses in the imaging optical system group is CTmax, and the maximum spacing distance on the optical axis between all adjacent lenses in the imaging optical system group at the corresponding infinity object distance is ATLmax, which preferably satisfies the following conditions:

[0010] -15.00 < MIN(fL / fi) < -2.80, where i is a positive integer and 1 ≤ i ≤ the total number of lenses in the camera optical system group;

[0011] 1.20 < fL / fA1 < 3.00; and

[0012] 0.20 < CTmax / ATLmax < 1.50.

[0013] This disclosure also provides a camera optical system assembly comprising multiple lenses. Preferably, the total number of these lenses is eight to nine. Preferably, these lenses, arranged sequentially from the object side to the image side along the optical path, include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, and each lens has an object-side surface facing the object side and an image-side surface facing the image side. Preferably, the first lens is the lens closest to the object side among all the lenses in the camera optical system assembly. Preferably, there are no other interposed lenses between the first lens and the eighth lens. Preferably, the first lens has positive refractive power. Preferably, the object-side surface of the second lens is convex near the optical axis. Preferably, the object-side surface of the third lens is convex near the optical axis. Preferably, the image-side surface of the third lens is concave near the optical axis. Preferably, the object-side surface of the fourth lens is convex near the optical axis. Preferably, the camera optical system further includes an aperture located between the first lens and the fourth lens. The total focal length of the camera optical system at infinity is fL, the focal length of the i-th lens (object-side) is fi, the minimum value of fL / fi is MIN(fL / fi), the focal length of the second lens is f2, the radius of curvature of the object-side surface of the third lens is R5, the radius of curvature of the object-side surface of the first lens (image-side) is Rlast2, and half of the maximum angle of view at infinity is HFOVL. Preferably, it satisfies the following conditions:

[0014] -13.80 < MIN(fL / fi) < -3.80, where i is a positive integer and 1 ≤ i ≤ the total number of lenses in the camera optical system group;

[0015] -1.00 < R5 / Rlast2 < 4.50;

[0016] -1.50 < fL / f2 < 4.50; and

[0017] 1.0 degrees < HFOVL < 7.5 degrees.

[0018] This disclosure provides an image capturing device, which includes the aforementioned camera optical system assembly and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on the imaging surface of the camera optical system assembly.

[0019] The camera optical system assembly and image capturing device disclosed herein can reduce the single-axis length by cutting parts of the lens barrel or lens to meet the thickness limitations of electronic devices, which helps to reduce the lens size and further achieve module miniaturization. In addition, it can also be combined with reflective elements to provide different optical path directions for the overall system, giving the lens more flexible usage space to demonstrate the telephoto effect of long focal length.

[0020] When MIN(fL / fi) meets the above conditions, the refractive power configuration can be adjusted, which helps to reduce sensitivity and form a super telephoto configuration.

[0021] When (R5+R6) / fL meets the above conditions, limiting the curvature of the third lens surface can help guide light, allowing the camera optical system to achieve a balance between aperture size, overall length, and telephoto structure.

[0022] When ATLmax / ImgH meets the above conditions, it can avoid the difficulty of assembly caused by excessive lens spacing and help improve the telescopic function of the camera optical system assembly.

[0023] When fL / fA1 meets the above conditions, the refractive force of the camera optical system assembly at the front end can be adjusted, which helps to compress the volume and reduce aberrations such as spherical aberration, thereby improving the imaging quality.

[0024] When CTmax / ATLmax meets the above conditions, it helps to balance the spatial configuration and control the overall length of the camera optical system group while maintaining a long focal length.

[0025] When R5 / Rlast2 meets the above conditions, it can help balance the optical path direction during the focusing process, improve image curvature, and reduce stray light generation.

[0026] When fL / f2 meets the above conditions, it helps to control whether the light converges or diverges in the second lens, which is beneficial for aberration correction and improves the light-gathering quality of the entire field of view.

[0027] When HFOVL meets the above conditions, it can enable the camera optical system assembly to have telescopic characteristics and help maintain its size. Simple Explanation of the Diagram

[0028] Figure 1 illustrates a schematic diagram of the imaging device according to the first embodiment of this disclosure in a first shooting state and a second shooting 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 shooting 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 shooting state. Figure 4 illustrates a schematic diagram of the imaging device according to the second embodiment of this disclosure in a first shooting state and a second shooting 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 shooting state. 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 shooting state. Figure 7 illustrates a schematic diagram of the imaging device according to the third embodiment of this disclosure in a first shooting state and a second shooting 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 shooting 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 shooting state. Figure 10 illustrates a schematic diagram of the imaging device according to the fourth embodiment of this disclosure in a first shooting state and a second shooting 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 shooting state. 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 shooting state. Figure 13 illustrates a schematic diagram of the imaging device according to the fifth embodiment of this disclosure in a first shooting state and a second shooting state. 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 shooting 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 shooting state. Figure 16 illustrates a schematic diagram of the imaging device according to the sixth embodiment of this disclosure in a first shooting state and a second shooting state. Figure 17 shows, from left to right, the spherical aberration, astigmatism, and distortion curves of the imaging device of the sixth embodiment in the first shooting 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 shooting state. Figure 19 illustrates a schematic diagram of the imaging device according to the seventh embodiment of this disclosure in a first shooting state and a second shooting state. Figure 20, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the seventh embodiment in the first shooting 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 shooting state. Figure 22 illustrates schematic diagrams of the imaging device according to the eighth embodiment of this disclosure in a first shooting state and a second shooting state. 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 shooting 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 shooting state. Figure 25 illustrates a schematic diagram of the imaging device according to the ninth embodiment of this disclosure in a first shooting state and a second shooting state. Figure 26, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the ninth embodiment in the first shooting 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 shooting state. Figure 28 illustrates a schematic diagram of the imaging device according to the tenth embodiment of this disclosure in a first shooting state and a second shooting state. Figure 29, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the tenth embodiment in the first shooting 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 shooting state. Figure 31 illustrates a schematic diagram of the imaging device according to the eleventh embodiment of this disclosure in a first shooting state and a second shooting state. Figure 32, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the eleventh embodiment in the first shooting state. Figure 33, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the eleventh embodiment in the second shooting state. Figure 34 illustrates a perspective view of an imaging device according to the twelfth embodiment of this disclosure. Figure 35 illustrates a perspective view of one side of an electronic device according to the thirteenth embodiment of this disclosure. Figure 36 shows a three-dimensional 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 shows a three-dimensional schematic diagram of the other side of the electronic device in Figure 37. Figure 39 shows a system block diagram of the electronic device in Figure 37. Figure 40 illustrates a perspective view of one side of an electronic device according to the fifteenth embodiment of this disclosure. Figure 41 illustrates a schematic diagram of an electronic device according to the sixteenth embodiment of this disclosure. Figure 42 illustrates a schematic diagram of the parameters YL1R1, YLA1Rlast, YLA2R1, YL8R2, YLmin, ETL12, ETLA12, ETL3 and ETLlast in the first shooting state according to the first embodiment of this disclosure. Figure 43 illustrates a schematic diagram of the parameter CRAL in the first shooting state according to the first embodiment of this disclosure. Figure 44 illustrates a schematic diagram of one configuration of the reflective elements in a camera optical system assembly according to the present disclosure. Figure 45 illustrates another configuration of the reflective element in the camera optical system assembly according to the present disclosure. Figure 46 illustrates another configuration of the reflective element in a camera optical system assembly according to the present disclosure. Figure 47 illustrates a schematic diagram of one configuration of two reflective elements in a camera optical system assembly according to the present disclosure. Figure 48 illustrates another configuration of the two reflective elements in a camera optical system assembly according to the present disclosure. Implementation

[0029] This disclosure presents a configuration in which the camera optical system assembly sequentially includes a first lens group, an aperture, and a second lens group along the optical path from the object side to the image side. This allows for precise aperture positioning to ensure sufficient light intake for the camera optical system assembly, thereby improving image illumination.

[0030] The first lens group can have one to three lenses, and the second lens group can have five to eight lenses. This provides sufficient lens variation to improve image quality and avoids problems of excessive length and weight. Specifically, the first lens group can have two lenses. The second lens group can have at least six lenses. The camera optical system group can have at least seven lenses. The camera optical system group can have eight lenses. The camera optical system group can have nine lenses.

[0031] The first lens group may include the first lens closest to the object side, and the second lens group may include the last lens closest to the image side, with no other interposed lenses between the first and second lens groups. This simplifies the complexity of the mechanism.

[0032] The camera optical system assembly may include a second lens, a third lens, a fourth lens, and a fifth lens in sequence between the first lens and the last lens along the optical path, and there are no other interposed lenses between the first lens and the fifth lens.

[0033] In the camera optical system group, the i-th lens is the i-th lens from the object side, the last lens is the N-th lens from the object side, and the N+1-i-th lens is the i-th lens from the image side, where N is the total number of lenses in the camera optical system group, and i is a positive integer in the range of 1 to N (the total number of lenses in the camera optical system group).

[0034] For example, when the total number of lenses in the camera optical system is eight, the sixth lens from the object side is the sixth lens, the seventh lens from the object side is the seventh lens, and the eighth lens from the object side is the eighth lens or the last lens. Furthermore, from the image side, the first to the eighth lenses correspond to the eighth lens to the first lens, respectively (lens 8+1-1 to 8+1-8, N = 8). When the total number of lenses in the camera optical system is nine, the sixth lens from the object side is the sixth lens, the seventh lens from the object side is the seventh lens, the eighth lens from the object side is the eighth lens, and the ninth lens from the object side is the ninth lens or the last lens. Furthermore, from the image side, the first to the ninth lenses correspond to the ninth lens to the first lens, respectively (lens 9+1-1 to 9+1-9, N = 9).

[0035] In another configuration disclosed herein, the camera optical system assembly may comprise multiple lenses. The total number of these lenses may be eight.

[0036] In the camera optical system assembly, these lenses, arranged sequentially from the object side to the image side along the optical path, include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The first lens is the first lens counted from the object side; the second lens is the second lens counted from the object side; the third lens is the third lens counted from the object side; the fourth lens is the fourth lens counted from the object side; the fifth lens is the fifth lens counted from the object side; the sixth lens is the sixth lens counted from the object side; the seventh lens is the seventh lens counted from the object side; and the eighth lens is the eighth lens counted from the object side, and the eighth lens can also be referred to as the last lens. From the image side, the first to the eighth lenses correspond to the eighth to the first lenses, respectively.

[0037] The camera optical system assembly may include an aperture, which can be located between the first lens and the fourth lens. This allows for precise aperture positioning, ensuring sufficient light intake and improving image illumination.

[0038] In another configuration disclosed herein, the camera optical system assembly may comprise multiple lenses. The total number of these lenses may be nine.

[0039] In the camera optical system assembly, these lenses, arranged sequentially from the object side to the image side along the optical path, include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens. The first lens is the first lens counted from the object side; the second lens is the second lens counted from the object side; the third lens is the third lens counted from the object side; the fourth lens is the fourth lens counted from the object side; the fifth lens is the fifth lens counted from the object side; the sixth lens is the sixth lens counted from the object side; the seventh lens is the seventh lens counted from the object side; the eighth lens is the eighth lens counted from the object side; and the ninth lens is the ninth lens counted from the object side, and the ninth lens can also be referred to as the last lens. From the image side, the first to ninth lenses correspond to the ninth to the first lenses, respectively.

[0040] The camera optical system assembly may include an aperture, which can be located between the first lens and the fourth lens. This allows for precise aperture positioning, ensuring sufficient light intake and improving image illumination.

[0041] In this disclosure, all lenses in the camera optical system assembly have an object-side surface facing the object side and an image-side surface facing the image side. The first lens is also referred to as the lens closest to the object side among all lenses in the camera optical system assembly, and the last lens is also referred to as the lens closest to the image side among all lenses in the camera optical system assembly.

[0042] The first lens group can have positive refractive power. This allows the refractive power configuration of the lens to be adjusted in conjunction with the aperture position, which helps to reduce the overall length of the camera optical system assembly at the front end.

[0043] The second lens group can have negative refractive power. This allows for adjustment of the focal length of the camera optical system at the rear end in conjunction with the aperture configuration, which helps in the formation of the telescope structure.

[0044] The first lens can have positive refractive power. This helps to reduce volume and control the shooting angle. The object-side surface of the first lens can be convex near the optical axis. This helps to adjust the incident light to enter the camera optical system assembly at an appropriate angle to meet application specifications.

[0045] The second lens can have positive refractive power. This, combined with the refractive power of the first lens, helps improve the light-gathering ability of the camera optical system at the front end and reduces aberrations. The object-side surface of the second lens can be convex near the optical axis. This, combined with the first lens, corrects aberrations such as spherical aberration and helps to increase the aperture and improve image quality.

[0046] The object-side surface of the third lens can be convex near the optical axis. This allows the object-side surface of the third lens to converge light rays, thus achieving miniaturization. The image-side surface of the third lens can be concave near the optical axis. This allows adjustment of the light exit direction of the third lens, helping to balance the light path and correct spherical aberration in the camera optical system.

[0047] The fourth lens can have positive refractive power. This helps to balance aberrations such as spherical aberration and chromatic aberration at the front and rear ends of the camera optical system. The object-side surface of the fourth lens can be convex near the optical axis. This allows adjustment of the refractive power of the fourth lens, which helps to converge light rays.

[0048] The fifth lens can have negative refractive power. This helps balance the overall refractive power configuration of the camera optics system, which is beneficial for extending the focal length. The image-side surface of the fifth lens can be concave near the optical axis. This helps to harmonize the optical path and helps the camera optics system achieve a balance between image quality and overall length.

[0049] In the camera optical system assembly, at least one of the fifth lens (fifth lens) and the sixth lens (sixth lens) counted from the object side can be a negative lens.

[0050] When the total number of lenses in a camera optical system is seven or more, the seventh lens (the seventh lens) counting from the object side can have negative refractive power. This helps to maintain an appropriate back focal length while correcting field curvature.

[0051] When the total number of lenses in a camera optical system is eight or more, the eighth lens (the eighth lens) counting from the object side can have positive refractive power. This helps in adjusting the back focal length, improves the light-gathering quality of each field of view at the imaging plane, and reduces aberrations.

[0052] Please note that in this disclosure, the focal length of the lens or the focal length of the lens group are calculated assuming that the medium in front of and behind the lens or lens group is air. Furthermore, in addition to visible light, the camera optical system assembly can also use infrared light, but this disclosure is not limited to this.

[0053] The camera optics system assembly may include at least two glass lenses and at least one plastic lens. This allows for a balance between production capability, temperature effects, size, weight, and cost, expanding the product's application range. Alternatively, the camera optics system assembly may also include at least two glass lenses and at least two plastic lenses.

[0054] The camera optical system assembly may include at least one spherical lens and at least one aspherical lens. By using a spherical lens with glass, image distortion caused by temperature effects can be avoided, while using an aspherical lens with plastic can help correct aberrations, reduce weight, and improve productivity.

[0055] The camera optical system assembly can perform a focusing process by moving at least one of its lenses. This enables the camera optical system assembly to perform both telephoto and close-up shooting functions, effectively enhancing its usability. Specifically, the camera optical system assembly can perform a focusing process by moving at least one lens in the second lens group.

[0056] The camera optical system assembly can have at least two shooting states through the focusing process. These at least two shooting states may include a first shooting state corresponding to an infinity object distance and a second shooting state corresponding to a finite object distance. The first shooting state is the state of the camera optical system assembly when the subject is at infinity (infinity object distance), and the second shooting state is the state of the camera optical system assembly when the subject is at a finite object distance. Referring to Figure 1, which illustrates schematic diagrams of the camera optical system assembly in the imaging device according to the first embodiment of this disclosure in the first shooting state and the second shooting state, the upper half of Figure 1 is a schematic diagram of the camera optical system assembly in the first shooting state, and the lower half of Figure 1 is a schematic diagram of the camera optical system assembly in the second shooting state.

[0057] In this disclosure, the finite object distance can be defined as the subject being significantly close to the camera optical system assembly relative to infinity. Specifically, the infinity object distance can refer to a distance on the optical axis between the object-side surfaces of the subject and the lens (e.g., the first lens) closest to the object side in the camera optical system assembly, which is greater than 1000 meters. Alternatively, the finite object distance can refer to a distance on the optical axis between the object-side surfaces of the subject and the lens (e.g., the first lens) closest to the object side in the camera optical system assembly, which is less than 50 meters. Finally, the finite object distance can also refer to a distance on the optical axis between the object-side surfaces of the subject and the lens (e.g., the first lens) closest to the object side in the camera optical system assembly, which is less than 15 meters (15000 millimeters).

[0058] When the subject moves from an infinity distance to a finite distance, the camera optical system can perform a focusing process to switch from the first shooting state to the second shooting state. Conversely, when the subject moves from a finite distance to an infinity distance, the camera optical system can also perform a focusing process to switch from the second shooting state to the first shooting state.

[0059] Please note that the first lens group and the second lens group disclosed herein are distinguished only by the aperture, and the lenses within each of the first lens group and the second lens group do not necessarily have a linkage relationship during the focusing process.

[0060] The lens with the smallest effective radius among all lenses in the camera optical system assembly at an infinity object distance can be either the second lens or the third lens from the image side of the camera optical system assembly. This helps to reduce the size of the camera optical system assembly and facilitates the formation of a super telescope structure with internal focusing capability. Specifically, the lens with the smallest effective radius among all lenses in the camera optical system assembly at an infinity object distance can be the second lens from the image side of the camera optical system assembly. Please refer to Figure 42, which illustrates a schematic diagram of the minimum effective radius YLmin of the camera optical system assembly in the first shooting state according to the first embodiment of this disclosure.

[0061] The maximum distance between all adjacent lenses in the camera optical system group on the optical axis can be located in the second lens group. This ensures sufficient space for lens movement during shooting at multiple object distances and helps improve manufacturability.

[0062] In the second lens group, at least two adjacent lenses can be bonded together. This helps to reduce the size, avoid problems such as total internal reflection and ghosting, and improve image quality.

[0063] The second lens group, along the optical path from the object side to the image side, sequentially includes a convex-concave lens, an achromatic lens group with negative refractive power, and an aspherical lens. This allows the lenses to work together to reduce astigmatism, chromatic aberration, and image curvature at different fields of view, improving light-gathering quality across the entire field of view. The achromatic lens group, along the optical path from the object side to the image side, can be composed of a pair of convex positive lenses and a pair of concave negative lenses. The achromatic lens group located in the second lens group helps correct chromatic aberration at multiple object distances, effectively improving image quality.

[0064] The imaging optical system assembly disclosed herein may include at least one reflective element with light path deflection function, such as a prism or reflective mirror, between the object and the imaging surface in the optical path. The reflective element may have at least one reflective surface, and the light path passing through the at least one reflective surface of the reflective element may be reflected at least once, which is beneficial for compressing the overall volume and allows the imaging optical system assembly to have different light path directions, providing a more flexible spatial configuration for the imaging optical system assembly. This makes the thinness and lightness of electronic devices not limited by the total optical length of the imaging optical system assembly, helps to reduce structural limitations and lens miniaturization, and thus achieves more stringent specification requirements.

[0065] The angle between the normal direction of the reflecting surface and the optical axis is not limited to 45 degrees; other angles can be used depending on spatial configuration and other requirements. The reflecting element can redirect the light path 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 reflecting 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. The reflecting 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. In addition, prisms with optical path deflection function are not counted in the lenses, that is, the lenses of the camera optical system group do not include prisms with optical path deflection function.

[0066] For further explanation, please refer to Figures 44 to 46, which are schematic diagrams illustrating one configuration of a reflective element according to this disclosure in a camera optical system assembly. As shown in Figures 44 to 46, the camera optical system assembly, along the optical path direction from the subject (not shown) to the imaging surface IMG, sequentially includes a reflective element LF, a lens group LG, a filter element FT, and the imaging surface IMG. The lens group LG corresponds to the two lens groups disclosed in this disclosure.

[0067] In Figure 44, 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 44, both the first transmitting surface LP1 and the second transmitting surface LP2 of the reflective element LF can be planar.

[0068] In Figure 45, 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.

[0069] In Figure 46, 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 46, both the first transmitting surface LP1 and the second transmitting surface LP2 of the reflective element LF can be curved surfaces.

[0070] Furthermore, please refer to Figures 47 and 48, which respectively illustrate a configuration relationship of two reflective elements according to the present disclosure in a camera optical system assembly. As shown in Figures 47 and 48, the camera optical system assembly, from the subject (not shown) to the imaging surface IMG along the optical path direction, sequentially includes a first reflective element LF1, a lens group LG, a filter element FT, a second reflective element LF2, and the imaging surface IMG. 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 47, the first reflecting element LF1 and the second reflecting element LF2 can both be prisms. In Figure 48, the first reflecting element LF1 and the second reflecting element LF2 can be a prism and a plane mirror, respectively.

[0071] The total focal length of the camera optical system at an infinity object distance is fL, and the focal length of the i-th lens in the camera optical system, counting from the object side, is fi. The minimum value of fL / fi is MIN(fL / fi), which satisfies the following conditions: -15.00 < MIN(fL / fi) < -2.80, where i is a positive integer and 1 ≤ i ≤ the total number of lenses in the camera optical system. This allows for adjustment of the refractive power configuration, which helps reduce sensitivity and create ultra-telephoto configurations. It also satisfies the following conditions: -13.80 < MIN(fL / fi) < -3.80, where i is a positive integer and 1 ≤ i ≤ the total number of lenses in the camera optical system. Furthermore, it satisfies the following conditions: -12.50 < MIN(fL / fi) < -4.30, where i is a positive integer and 1 ≤ i ≤ the total number of lenses in the camera optical system. The following conditions can also be satisfied: -11.70 < MIN(fL / fi) < -5.00, where i is a positive integer and 1 ≤ i ≤ the total number of lenses in the camera optical system group. Alternatively, the following condition can also be satisfied: -11.51 ≤ MIN(fL / fi) ≤ -5.16, where i is a positive integer and 1 ≤ i ≤ the total number of lenses in the camera optical system group.

[0072] The radius of curvature of the object-side surface of the third lens is R5, and the radius of curvature of the image-side surface of the third lens is R6. The total focal length of the imaging optical system at an infinity object distance is fL, which satisfies the following condition: 0 < (R5+R6) / fL < 3.50. By limiting the curvature of the third lens surface, it is possible to guide light, achieving a balance between aperture size, total length, and telephoto structure in the imaging optical system. The following conditions can also be satisfied: 0.05 < (R5+R6) / fL < 3.00. The following conditions can also be satisfied: 0.10 < (R5+R6) / fL < 2.50. The following conditions can also be satisfied: 0.20 < (R5+R6) / fL < 1.20. The following conditions can also be satisfied: 0.32 ≤ (R5+R6) / fL ≤ 0.95.

[0073] The maximum distance between all adjacent lenses on the optical axis of the camera optical system assembly at an infinity object distance is ATLmax, and the maximum imaging height of the camera optical system assembly (which can be half the total diagonal length of the effective sensing area of ​​the electronic image sensor) is ImgH. This satisfies the following condition: 1.00 < ATLmax / ImgH < 6.00. This avoids assembly difficulties caused by excessively large lens spacing and helps improve the telescopic function of the camera optical system assembly. It also satisfies the following conditions: 1.10 < ATLmax / ImgH < 5.00; 1.15 < ATLmax / ImgH < 4.50; 1.20 < ATLmax / ImgH < 3.50; and 1.30 ≤ ATLmax / ImgH ≤ 3.30.

[0074] The total focal length of the camera optical system assembly at an infinity object distance is fL, and the focal length of the first lens group is fA1, which satisfies the following condition: 1.20 < fL / fA1 < 3.00. This allows adjustment of the refractive power of the camera optical system assembly at the front end, helping to reduce volume and aberrations such as spherical aberration, thus improving image quality. It also satisfies the following conditions: 1.25 < fL / fA1 < 2.80. Furthermore, it satisfies the following conditions: 1.35 < fL / fA1 < 2.65. Finally, it satisfies the following conditions: 1.49 ≤ fL / fA1 ≤ 2.48.

[0075] The maximum thickness of a single lens on the optical axis in the camera optical system assembly is CTmax, and the maximum distance between all adjacent lenses on the optical axis at infinity is ATLmax. These values ​​satisfy the following condition: 0.20 < CTmax / ATLmax < 1.50. This helps to balance the spatial configuration, controlling the overall length of the camera optical system assembly while maintaining a long focal length. The following conditions also apply: 0.20 < CTmax / ATLmax < 1.25. The following conditions also apply: 0.25 < CTmax / ATLmax < 1.00. The following conditions also apply: 0.38 ≤ CTmax / ATLmax ≤ 0.86.

[0076] The radius of curvature of the object-side surface of the third lens is R5, and the radius of curvature of the object-side surface of the first lens in the imaging optical system assembly, counting from the image side, is Rlast2. This satisfies the following condition: -1.50 < R5 / Rlast2 < 5.00. This helps balance the optical path direction during focusing, improves image curvature, and reduces stray light generation. It also satisfies the following conditions: -1.00 < R5 / Rlast2 < 4.50. Furthermore, it satisfies the following conditions: -0.80 < R5 / Rlast2 < 3.50. Additionally, it satisfies the following conditions: -0.60 < R5 / Rlast2 < 2.30. Finally, it satisfies the following condition: -0.29 ≤ R5 / Rlast2 ≤ 1.91.

[0077] The total focal length of the camera optical system assembly at infinity is fL, and the focal length of the second lens is f2, which satisfies the following condition: -1.50 < fL / f2 < 4.50. This helps control the convergence or divergence of light in the second lens, facilitating aberration correction and improving the light-gathering quality across the entire field of view. It also satisfies the following conditions: -1.20 < fL / f2 < 4.00. Furthermore, it satisfies the following conditions: -1.00 < fL / f2 < 3.00. Additionally, it satisfies the following conditions: -0.80 < fL / f2 < 2.20. Finally, it satisfies the following condition: -0.50 ≤ fL / f2 ≤ 1.87.

[0078] The maximum field of view (HFOVL) of the camera optical system at an infinity object distance is half of that of the HFOVL, which satisfies the following conditions: 1.0 degrees < HFOVL < 7.5 degrees. This allows the camera optical system to have telescopic characteristics and helps maintain its size. It also satisfies the following conditions: 1.5 degrees < HFOVL < 6.5 degrees. Furthermore, it satisfies the following conditions: 1.5 degrees < HFOVL < 6.0 degrees. Finally, it satisfies the following conditions: 3.0 degrees ≤ HFOVL ≤ 4.9 degrees.

[0079] The total focal length of the camera optical system assembly at an infinity object distance is fL, and the entrance pupil diameter is EPD, which satisfies the following condition: 1.40 < fL / EPD < 3.50. This helps to achieve a balance between the focal length, light intake, and total weight of the camera optical system assembly. The following condition can also be satisfied: 1.70 < fL / EPD < 3.30.

[0080] The combined focal length of the first and second lenses is f12, and the combined focal length of the second and third lenses is f23, which satisfies the following condition: -0.35 < f12 / f23 < 3.00. This allows for adjustment of the lens configuration at the front of the camera optical system, helping to standardize the angle of view and coordinate with the aperture design to adjust the direction of light travel. It also satisfies the following condition: -0.30 < f12 / f23 < 2.70. Furthermore, it also satisfies the following condition: -0.25 < f12 / f23 < 2.40.

[0081] 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 second lens is R3, which can satisfy the following condition: -0.50 < (R1-R3) / (R1+R3) < 0.70. This allows the surface shapes of the object-side surfaces of the first and second lenses to match, which helps in optical path harmonization and reducing spherical aberration. The following condition can also be satisfied: -0.40 < (R1-R3) / (R1+R3) < 0.60.

[0082] The total focal length of the camera optical system assembly at an infinity object distance is fL, the focal length of the fifth lens is f5, and the focal length of the sixth lens in the camera optical system assembly, counting from the object side, is f6. The minimum value of fL / f5 and fL / f6 is MIN(fL / f5, fL / f6), which satisfies the following condition: -13.50 < MIN(fL / f5, fL / f6) < -1.00. This allows adjustment of the refractive power configuration in the middle section of the camera optical system assembly, contributing to the formation of the telescope structure. It also satisfies the following condition: -12.50 < MIN(fL / f5, fL / f6) < -1.50. Furthermore, it satisfies the following condition: -11.20 < MIN(fL / f5, fL / f6) < -2.00. The following condition can also be satisfied: -11.51 ≤ MIN(fL / f5,fL / f6) ≤ -2.33.

[0083] The thickness of the first lens along the optical axis is CT1, and the thickness of the second lens in the imaging optical system assembly, measured from the image side, along the optical axis is CTlast2. This satisfies the following condition: 0.03 < CTlast2 / CT1 < 0.80. By controlling the center thickness ratio of the first lens and the penultimate lens, it is helpful to reduce the volume of the imaging optical system assembly while also considering lens manufacturing limitations. Furthermore, the following condition can also be satisfied: 0.04 < CTlast2 / CT1 < 0.70.

[0084] The total focal length of the camera optical system assembly at an infinity object distance is fL, and the distance from the object-side surface of the first lens to the imaging plane on the optical axis is TL, which satisfies the following condition: 1.15 < fL / TL < 2.00. This helps to compress the total length within the long focal length specification and achieve a balance between focal length, depth of field, angle of view, and total length. The following condition can also be satisfied: 1.20 < fL / TL < 1.80. The following condition can also be satisfied: 1.25 < fL / TL < 1.60.

[0085] The total focal length of the camera optical system at an infinity object distance is fL, and the focal length of the third lens is f3, which satisfies the following condition: 0 < |fL / f3| < 2.20. This allows adjustment of the refractive power intensity of the third lens, helping to balance the refractive power distribution of the camera optical system and reduce its sensitivity. It also satisfies the following condition: 0.01 < |fL / f3| < 2.10. Furthermore, it satisfies the following condition: 0.03 < |fL / f3| < 2.00.

[0086] The third lens has a focal length of f3, and the second lens in the imaging optical system has a focal length of flast2 (counting from the image side). This satisfies the following condition: -6.50 < flast2 / f3 < 0.70. This helps balance the lighting under different shooting conditions and helps correct astigmatism and distortion. It also satisfies the following condition: -5.00 < flast2 / f3 < 0.50.

[0087] The optical axis spacing between the first and second lenses is T12, and the optical axis spacing between the second and third lenses is T23. This spacing satisfies the following condition: 0 < T12 / T23 < 4.00. This helps reduce the complexity of the structural design and improves the lens assembly yield. It also satisfies the following conditions: 0.01 < T12 / T23 < 3.00. Furthermore, it satisfies the following condition: 0.01 < T12 / T23 < 2.00.

[0088] The total focal length of the camera optical system assembly at infinity is fL, which satisfies the following condition: 50.00 mm < fL < 80.00 mm. This allows the camera optical system assembly to possess telephoto capabilities with a long focal length, meeting the application requirements of the product. It also satisfies the following condition: 52.00 mm < fL < 75.00 mm.

[0089] The maximum imaging height of the camera optical system assembly is 1 mgH, which satisfies the following conditions: 3.00 mm < 1 mgH < 5.50 mm. This allows for adjustment of the camera optical system assembly's size configuration, facilitating adjustments to the viewing angle and imaging plane size. It also satisfies the following conditions: 3.50 mm < 1 mgH < 5.30 mm.

[0090] The combined focal length of the first and second lenses is f12, and the combined focal length of the fifth lens and the sixth lens (counting from the object side) in the imaging optical system is f56. This satisfies the following condition: -4.30 < f12 / f56 < 0.30. This allows adjustment of the refractive power distribution of the imaging optical system, helping to balance the light path and enhance the telephoto performance of long focal lengths. It also satisfies the following condition: -4.00 < f12 / f56 < 0.10. Furthermore, it satisfies the following condition: -3.30 < f12 / f56 < 0.

[0091] The total focal length of the camera optical system assembly at infinity is fL, the incident angle of the principal ray at the maximum imaging height at infinity is CRAL, and half of the maximum angle of view at infinity is HFOVL. These conditions satisfy the following: 3.00 [mm / degree] < fL / (CRAL+HFOVL) < 15.00 [mm / degree]. This helps to standardize appropriate angle of view and focal length specifications and improves the response efficiency of the electronic image sensor. Referring to Figure 43, a schematic diagram of the parameter CRAL according to the first embodiment of this disclosure is shown. In the first shooting state, a principal ray CRL is incident at the maximum imaging height of the imaging plane IMG, and the angle between the normal direction of the imaging plane IMG and the principal ray CRL is the incident angle of the principal ray (CRAL).

[0092] When the object distance is infinity, the maximum effective radius of the lens surface closest to the image side of the first lens group is YLA1Rlast, and the maximum effective radius of the lens surface closest to the object side of the second lens group is YLA2R1. The distance parallel to the optical axis between the positions of the maximum effective radii of the first and second lens groups at the same object distance is ETLA12, which satisfies the following condition: 0.27 < (YLA1Rlast - YLA2R1) / ETLA12 < 0.75. This, in conjunction with the central field-of-view optical path, effectively controls the deflection angle of the edge optical path around the aperture, helping to improve the focusing quality of the imaging light. Please refer to Figure 42, which illustrates a schematic diagram of the parameters YLA1Rlast, YLA2R1, and ETLA12 in the first shooting state according to the first embodiment of this disclosure.

[0093] The second lens has a focal length of f2, and the fourth lens has a focal length of f4, which satisfies the following condition: -0.20 < f4 / f2 < 0.85. This allows the refractive forces of the second and fourth lenses to work together, aiding in the correction of aberrations such as chromatic aberration and spherical aberration. The following condition must also be satisfied: 0 < f4 / f2 < 0.75.

[0094] The entrance pupil diameter of the camera optical system assembly is EPD, which meets the following conditions: 15.00 mm < EPD < 32.00 mm. This allows for a larger aperture, thus expanding the range of applications. It also meets the following condition: 17.00 mm < EPD < 30.00 mm.

[0095] The distance parallel to the optical axis between the maximum effective radius position of the object-side surface of the third lens and the maximum effective radius position of the image-side surface of the third lens at an infinity object distance is ETL3. The thickness of the third lens on the optical axis is CT3, which satisfies the following condition: 0.15 < ETL3 / CT3 < 3.00. This allows adjustment of the ratio of the thickness at the center to the edge of the third lens, which helps harmonize the edge optical path and enhances the mechanical strength of the third lens. Please refer to Figure 42, which is a schematic diagram illustrating the parameter ETL3 in the first shooting state according to the first embodiment of this disclosure.

[0096] The distance parallel to the optical axis between the maximum effective radius of the object-side surface of the last lens and the maximum effective radius of the image-side surface of the last lens when the camera optical system is at an infinity object distance is ETLlast. The thickness of the last lens on the optical axis is CTlast, which can satisfy the following condition: 0.15 < ETLlast / CTlast < 2.00. This allows adjustment of the ratio of the center to the edge thickness of the last lens, which helps in lens shaping and reduces the sensitivity of the camera optical system. Please refer to Figure 42, which is a schematic diagram illustrating the parameter ETLlast in the first shooting state according to the first embodiment of this disclosure.

[0097] The distance between the first lens and the second lens on the optical axis is T12. 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 at infinity object distance is ETL12, which satisfies the following condition: 0.05 < 10 × T12 / ETL12 < 3.50. This effectively controls the spacing between the first and second lenses, reducing stray light generation while minimizing volume. Please refer to Figure 42, which illustrates a schematic diagram of the parameter ETL12 in the first shooting state according to the first embodiment of this disclosure.

[0098] The maximum imaging height of the camera optical system is 1 mgH, and the entrance pupil diameter is EPD, which can satisfy the following condition: 0.10 < 2 × 1 mgH / EPD < 0.70. This helps to adjust the aperture and imaging plane size, thereby increasing the amount of light entering the camera optical system. It can also satisfy the following condition: 0.15 < 2 × 1 mgH / EPD < 0.55.

[0099] The maximum effective radius of the object-side surface of the first lens of the camera optical system assembly at an infinity object distance is YL1R1, and the maximum effective radius of the image-side surface of the eighth lens of the camera optical system assembly at an infinity object distance is YL8R2, which can satisfy the following condition: 2.00 < YL1R1 / YL8R2 < 4.00. This allows adjustment of the outer diameter ratio of the object-side and image-side ends of the camera optical system assembly to achieve a balance between viewing angle and volume. The following condition can also be satisfied: 2.10 < YL1R1 / YL8R2 < 3.85. Please refer to Figure 42, which is a schematic diagram illustrating the parameters YL1R1 and YL8R2 of the first shooting state according to the first embodiment of this disclosure.

[0100] The sixth lens has an Abbe number of V6 and a refractive index of N6, satisfying the following condition: 5.00 < V6 / N6 < 14.80. This effectively corrects chromatic aberration and improves light-gathering quality in various shooting conditions. It also satisfies the following condition: 5.50 < V6 / N6 < 13.80.

[0101] The total focal length of the camera optical system assembly at infinity is fL, and the focal length of the fourth lens is f4, which satisfies the following condition: 2.50 < fL / f4 < 5.20. This helps to enhance the light-gathering ability of the fourth lens, thus facilitating a balance between the super telescope structure and miniaturization. It also satisfies the following condition: 2.60 < fL / f4 < 5.00.

[0102] The distance between the fifth and sixth lenses on the optical axis is T56. The thickness of the fourth lens on the optical axis is CT4, the thickness of the fifth lens on the optical axis is CT5, and the thickness of the sixth lens on the optical axis is CT6. This satisfies the following condition: 0.05 < (T56 + CT6) / (CT4 + CT5) < 0.75. This helps increase space utilization and reduce manufacturing tolerances. It also satisfies the following condition: 0.10 < (T56 + CT6) / (CT4 + CT5) < 0.65.

[0103] The various technical features of the camera optical system group disclosed in this disclosure can be combined and configured to achieve corresponding effects.

[0104] In the camera optical system assembly disclosed in this disclosure, the lens material can be glass or plastic. If the lens is made of glass, the freedom of refractive power configuration of the camera optical system assembly 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 material is 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 camera optical system assembly disclosed in this disclosure. Further, aspherical surfaces can be manufactured using methods such as plastic injection molding or molding glass lenses.

[0105] In the camera optical system group disclosed in this disclosure, if the lens surface is aspherical, it means that all or part of the optically effective area of ​​the lens surface is aspherical.

[0106] In the imaging optical system assembly 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 a plastic material 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.

[0107] In the camera optical system assembly disclosed herein, if the lens surface is convex and the location 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 location 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.

[0108] In the camera optical system assembly disclosed herein, the imaging surface of the camera optical system assembly can 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.

[0109] In the imaging optical system assembly disclosed herein, one or more imaging correction elements (such as planar elements) can be selectively disposed between the lens closest to the imaging surface and the imaging surface in the imaging optical path to achieve the effect of correcting image curvature (such as image distortion). 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 facing the object side near the imaging surface.

[0110] In the camera optical system assembly disclosed herein, at least one aperture stop may be provided, 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.

[0111] This disclosure may appropriately incorporate a variable aperture element, which can be a mechanical component or a light-regulating element, capable of electrically or by electrical signals controlling the size and shape of the aperture. The mechanical component may include movable parts such as a blade assembly or a shielding plate; the light-regulating element may include a filter element, an electrochromic material, a liquid crystal layer, or other shielding material. 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 for adjustment of image quality, such as depth of field or exposure speed, by changing the aperture value.

[0112] This disclosure allows for the appropriate placement of one or more optical elements to restrict the passage of light through a camera optical system assembly. 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 may be placed between the object end, image end, or lenses of the camera optical system assembly to control the passage of specific types of light, thereby meeting application requirements.

[0113] The imaging optical system assembly 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.

[0114] The imaging optical system assembly disclosed herein may further include a light-shielding element. The opening of the light-shielding element may be non-circular, and the non-circular opening may have different effective radii in different directions perpendicular to the optical axis. This allows for the use of a non-circular lens or aperture, effectively saving space and fully utilizing the light passing through the non-circular lens or aperture, thus helping to reduce stray light. The periphery of the inner hole of the light-shielding element may contain a wavy or serrated structure.

[0115] In the camera optical system group 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 deflected by an optical path deflection element, the data on the optical axis are also calculated along the optical axis.

[0116] Based on the above implementation methods, specific embodiments are presented below and described in detail with reference to the accompanying drawings.

[0117] <First Embodiment>

[0118] Please refer to Figures 1 to 3. Figure 1 shows schematic diagrams of the imaging device according to the first embodiment of this disclosure in the first shooting state and the second shooting state, respectively. 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 shooting state, and 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 shooting state. The upper part of Figure 1 is a schematic diagram of the imaging optical system assembly in the first shooting state, and the lower part of Figure 1 is a schematic diagram of the imaging optical system assembly in the second shooting state. As shown in Figure 1, the imaging device 1 includes an imaging optical system assembly (unlabeled) and an electronic photosensitive element IS. The imaging optical system assembly, along the optical path from the object side to the image side, includes, in sequence, a first lens E1, a second lens E2, an aperture ST, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an aperture stop S1, a seventh lens E7, an eighth lens E8, a filter element E10, and an imaging plane IMG. Furthermore, the camera optical system assembly is configured along the optical path from the object side to the image side as a first lens group A1, an aperture ST, and a second lens group A2. The first lens group A1 includes a first lens E1 and a second lens E2, and the second lens group A2 includes a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. The electronic image sensor IS is mounted on the imaging plane IMG. The camera optical system assembly comprises eight lenses (E1, E2, E3, E4, E5, E6, E7, and E8), and there are no other interposed lenses between the lenses.

[0119] In the camera optical system assembly of the first embodiment, the first to eighth lenses, counted from the object side, are respectively the first lens E1 to the eighth lens E8, and the first to eighth lenses, counted from the image side, correspond to the eighth lens E8 to the first lens E1, wherein the eighth lens E8 can also be referred to as the last lens.

[0120] The camera optical system assembly of the first embodiment performs a focusing process by moving at least one of its lenses. The camera optical system assembly, through the focusing process, has a first shooting state corresponding to an infinity object distance and a second shooting state corresponding to a finite object distance of 10,000.000 mm. The first shooting state is the state of the camera optical system assembly when the subject is at infinity (infinity object distance), and the second shooting state is the state of the camera optical system assembly when the subject is at a finite object distance (finite object distance). When the subject moves from infinity to a finite object distance, the camera optical system assembly performs a focusing process to change from the first shooting state to the second shooting state. Conversely, when the subject moves from a finite object distance to infinity, the camera optical system assembly also performs a focusing process to change from the second shooting state to the first shooting state. During the focusing process, the eighth lens E8 of the camera optical system assembly moves along the optical axis.

[0121] The first lens group A1 has positive refractive power, and the second lens group A2 has negative refractive power.

[0122] 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 concave near the optical axis. Both of its surfaces are spherical.

[0123] 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 convex near the optical axis. Both of its surfaces are spherical.

[0124] The third lens E3 has negative 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 spherical.

[0125] The fourth lens E4 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.

[0126] The fifth lens, E5, has negative refractive power and is made of glass. Its object-side surface is concave near the optical axis, and its image-side surface is also concave near the optical axis. Both surfaces are spherical. The object-side surface of the fifth lens, E5, is bonded to the image-side surface of the fourth lens, E4.

[0127] The sixth lens, E6, 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.

[0128] The seventh lens E7 has negative refractive power and is made of glass. 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 spherical.

[0129] The eighth lens, E8, 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.

[0130] The filter element E10 is made of glass and is located between the eighth lens E8 and the imaging surface IMG. It does not affect the focal length of the camera optical system group.

[0131] In the camera optical system group, the lens with the smallest effective radius among all lenses at the corresponding infinity object distance is the seventh lens, E7.

[0132] The maximum distance between all adjacent lenses in the camera optical system group on the optical axis is located between the sixth lens E6 and the seventh lens E7.

[0133] In the second lens group A2, the third lens E3 is a convex-concave lens. The fourth lens E4, a biconvex positive lens, and the fifth lens E5, a biconcave negative lens, combine to form an achromatic lens group with negative refractive power. The sixth lens E6 is an aspherical lens.

[0134] The equations for the aspherical surfaces of the above lenses are expressed as follows:

[0135] 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;

[0136] Y: The perpendicular distance between a point on the aspherical curve and the optical axis;

[0137] R: Radius of curvature;

[0138] k: cone coefficient; and

[0139] Ai: The i-th order aspherical coefficient.

[0140] The total focal length of the camera optical system group at the corresponding infinity object distance is fL, the aperture value (F-number) of the camera optical system group at the corresponding infinity object distance is FnoL, half of the maximum angle of view of the camera optical system group at the corresponding infinity object distance is HFOVL, and the maximum angle of view of the camera optical system group at the corresponding infinity object distance is FOVL, which satisfies the following conditions: fL = 64.50 mm; FnoL = 3.00; HFOVL = 3.8 degrees; and FOVL = 7.6 degrees.

[0141] The total focal length of the camera optical system group at a corresponding finite object distance (10000.000 mm) is fS, the aperture value of the camera optical system group at a corresponding finite object distance (10000.000 mm) is FnoS, half of the maximum angle of view of the camera optical system group at a corresponding finite object distance (10000.000 mm) is HFOVS, and the maximum angle of view of the camera optical system group at a corresponding finite object distance (10000.000 mm) is FOVS, which satisfies the following conditions: fS = 63.82 mm; FnoS = 2.97; HFOVS = 3.8 degrees; and FOVS = 7.6 degrees.

[0142] In this embodiment, D0 is the distance on the optical axis between the subject and the object-side surface of the first lens E1 (approximately equivalent to the object distance of the imaging optical system assembly), D1 is the distance on the optical axis between the image-side surface of the seventh lens E7 and the object-side surface of the eighth lens E8, and D2 is the distance on the optical axis between the image-side surface of the eighth lens E8 and the filter element E10. When the imaging optical system assembly is in the first shooting state and the second shooting state during the focusing process, the object distance of the imaging optical system assembly will differ from the values ​​of D0 to D2. In the first shooting state, the imaging optical system assembly satisfies the following conditions: object distance = ∞ (infinity); D0 = ∞; D1 = 5.855 mm; and D2 = 4.445 mm. When the camera optical system is in the second shooting state, it satisfies the following conditions: object distance = 10000.000 mm; D0 = 10000.000 mm; D1 = 5.330 mm; and D2 = 4.970 mm.

[0143] The entrance pupil diameter of the camera optical system assembly is EPD, which satisfies the following condition: EPD = 21.50 mm.

[0144] The maximum imaging height of the camera optical system assembly is ImgH, which satisfies the following condition: ImgH = 4.35 mm.

[0145] The focal length of the first lens group A1 is fA1, which satisfies the following condition: fA1 = 29.52 mm.

[0146] The focal length of the second lens group A2 is fA2, which satisfies the following condition: fA2 = -27.65 mm.

[0147] The total focal length of the camera optical system group at the corresponding infinity object distance is fL, and the entrance pupil diameter of the camera optical system group is EPD, which satisfies the following condition: fL / EPD = 3.00.

[0148] The total focal length of the camera optical system group at an infinity object distance is fL. The focal lengths of the first lens E1 are f1, the second lens E2 are f2, the third lens E3 are f3, the fourth lens E4 are f4, the fifth lens E5 are f5, the sixth lens E6 are f6, the seventh lens E7 are f7, and the eighth lens E8 are f8. The focal length of the i-th lens in the camera optical system group, counting from the object side, is fi. The minimum value of fL / fi is MIN(fL / fi), which satisfies the following condition: MIN(fL / fi) = -5.78, where i is a positive integer and 1 ≤ i ≤ 8. In this embodiment, among the first lens E1 to the eighth lens E8, fL / f7 is less than fL / f1, fL / f2, fL / f3, fL / f4, fL / f5, fL / f6, and fL / f8, therefore MIN(fL / f7) is equal to fL / f7.

[0149] The total focal length of the camera optical system group at an infinity object distance is fL, the focal length of the fifth lens E5 is f5, and the focal length of the sixth lens E6 is f6. The minimum value of fL / f5 and fL / f6 is MIN(fL / f5, fL / f6), which satisfies the following condition: MIN(fL / f5, fL / f6) = -4.85. In this embodiment, among the first lens E1 to the eighth lens E8, fL / f5 is less than fL / f6, therefore MIN(fL / f5, fL / f6) is equal to fL / f5.

[0150] The total focal length of the camera optical system group at the corresponding infinity object distance is fL, and the distance from the object-side surface of the first lens E1 to the imaging plane IMG on the optical axis is TL, which satisfies the following condition: fL / TL = 1.37.

[0151] The total focal length of the camera optical system group at the corresponding infinity object distance is fL, and the focal length of the first lens group A1 is fA1, which satisfies the following condition: fL / fA1 = 2.19.

[0152] The total focal length of the camera optical system group at the corresponding infinity object distance is fL, and the focal length of the second lens E2 is f2, which satisfies the following condition: fL / f2 = 1.48.

[0153] The total focal length of the camera optical system group at the corresponding infinity object distance is fL, and the focal length of the third lens E3 is f3, which satisfies the following condition: |fL / f3| = 0.73.

[0154] The total focal length of the camera optical system group at the corresponding infinity object distance is fL, and the focal length of the fourth lens E4 is f4, which satisfies the following condition: fL / f4 = 3.65.

[0155] The focal length of the second lens E2 is f2, and the focal length of the fourth lens E4 is f4. They satisfy the following condition: f4 / f2 = 0.41.

[0156] The focal length of the third lens E3 is f3, and the focal length of the second lens in the imaging optical system group, counting from the image side, is flast2, which satisfies the following condition: flast2 / f3 = 0.13. In this embodiment, the second lens in the imaging optical system group, counting from the image side, is the seventh lens E7.

[0157] The combined focal length of the first lens E1 and the second lens E2 is f12, and the combined focal length of the second lens E2 and the third lens E3 is f23, which satisfies the following condition: f12 / f23 = 0.38.

[0158] The combined focal length of the first lens E1 and the second lens E2 is f12. The combined focal length of the fifth lens E5 and the sixth lens (counting from the object side) in the imaging optical system group is f56, which satisfies the following condition: f12 / f56 = -2.00. In this embodiment, the sixth lens (counting from the object side) in the imaging optical system group is the sixth lens E6.

[0159] The radius of curvature of the object-side surface of the third lens E3 is R5, the radius of curvature of the image-side surface of the third lens E3 is R6, and the total focal length of the camera optical system group at the corresponding infinity object distance is fL, which satisfies the following condition: (R5+R6) / fL = 0.55.

[0160] 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 second lens E2 is R3, which satisfies the following condition: (R1-R3) / (R1+R3) = -0.12.

[0161] The radius of curvature of the object-side surface of the third lens E3 is R5, and the radius of curvature of the object-side surface of the first lens in the imaging optical system assembly, counting from the image side, is Rlast2, which satisfies the following condition: R5 / Rlast2 = 1.43. In this embodiment, the first lens in the imaging optical system assembly, counting from the image side, is the eighth lens E8.

[0162] The maximum thickness of a single lens on the optical axis among all lenses in the camera optical system group is CTmax. The maximum distance between all adjacent lenses on the optical axis at an infinity object distance is ATLmax, which satisfies the following condition: CTmax / ATLmax = 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 two adjacent lenses on the optical axis. In this embodiment, among the first lens E1 to the eighth lens E8, the thickness of the fourth lens E4 on the optical axis is greater than the thickness of the other lenses on the optical axis, therefore CTmax is equal to the thickness of the fourth lens E4 on the optical axis. In this embodiment, among the first lens E1 to the eighth lens E8, the distance between the sixth lens E6 and the seventh lens E7 on the optical axis at an infinity object distance is greater than the distance between the other adjacent lenses on the optical axis, therefore ATLmax is equal to the distance between the sixth lens E6 and the seventh lens E7 on the optical axis.

[0163] The thickness of the first lens E1 on the optical axis is CT1, and the thickness of the second lens in the imaging optical system assembly, measured from the image side, is CTlast2, which satisfies the following condition: CTlast2 / CT1 = 0.20. In this embodiment, the second lens in the imaging optical system assembly, measured from the image side, is the seventh lens E7.

[0164] The distance between the first lens E1 and the second lens E2 on the optical axis is T12, and the distance between the second lens E2 and the third lens E3 on the optical axis is T23, which satisfies the following condition: T12 / T23 = 0.07.

[0165] The distance between the fifth lens E5 and the sixth lens E6 on the optical axis is T56. The thickness of the fourth lens E4 on the optical axis is CT4. The thickness of the fifth lens E5 on the optical axis is CT5. The thickness of the sixth lens E6 on the optical axis is CT6. They satisfy the following condition: (T56+CT6) / (CT4+CT5) = 0.17.

[0166] The maximum distance between all adjacent lenses on the optical axis of the camera optical system group at the corresponding infinity object distance is ATLmax, and the maximum imaging height of the camera optical system group is ImgH, which satisfies the following condition: ATLmax / ImgH = 2.71.

[0167] The Abbe number of the sixth lens E6 is V6, and the refractive index of the sixth lens E6 is N6, which satisfies the following condition: V6 / N6 = 8.21.

[0168] The maximum imaging height of the camera optical system group is ImgH, and the entrance pupil diameter of the camera optical system group is EPD, which satisfies the following condition: 2×ImgH / EPD = 0.40.

[0169] The total focal length of the camera optical system group at the corresponding infinity object distance is fL, the incident angle of the principal ray at the maximum imaging height position at the corresponding infinity object distance is CRAL, and half of the maximum angle of view of the camera optical system group at the corresponding infinity object distance is HFOVL, which satisfies the following condition: fL / (CRAL+HFOVL) = 6.51 [mm / degree].

[0170] When the camera optical system group is at an infinity object distance, the distance parallel to the optical axis between the maximum effective radius position of the object-side surface of the third lens E3 and the maximum effective radius position of the image-side surface of the third lens E3 is ETL3, and the thickness of the third lens E3 on the optical axis is CT3, which satisfies the following condition: ETL3 / CT3 = 1.31.

[0171] The distance parallel to the optical axis between the maximum effective radius position of the object-side surface of the last lens and the maximum effective radius position of the image-side surface of the last lens at infinity is ETLlast, and the thickness of the last lens on the optical axis is CTlast, which satisfies the following condition: ETLlast / CTlast = 0.49. In this embodiment, the last lens is the eighth lens E8.

[0172] The distance between the first lens E1 and the second lens E2 on the optical axis is T12. When the camera optical system group is at the corresponding infinity object distance, the distance parallel to the optical axis between the position of the maximum effective radius of the image side surface of the first lens E1 and the position of the maximum effective radius of the object side surface of the second lens E2 is ETL12, which satisfies the following condition: 10×T12 / ETL12 = 0.58.

[0173] The maximum effective radius of the object-side surface of the first lens E1 in the camera optical system group at the corresponding infinity object distance is YL1R1, and the maximum effective radius of the image-side surface of the eighth lens E8 in the camera optical system group at the corresponding infinity object distance is YL8R2, which satisfies the following condition: YL1R1 / YL8R2 = 2.45.

[0174] At an infinity object distance, the maximum effective radius of the lens surface closest to the image side of the first lens group A1 is YLA1Rlast, and the maximum effective radius of the lens surface closest to the object side of the second lens group A2 is YLA2R1. The distance parallel to the optical axis between the positions of the maximum effective radii of the lens surfaces closest to the image side of the first lens group A1 and the maximum effective radii of the lens surfaces closest to the object side of the second lens group A2 is ETLA12, which satisfies the following condition: (YLA1Rlast - YLA2R1) / ETLA12 = 0.42. In this embodiment, the lens surface closest to the image side of the first lens group A1 is the image-side surface of the second lens E2, and the lens surface closest to the object side of the second lens group A2 is the object-side surface of the third lens E3.

[0175] Please refer to Tables 1A to 1C below.

[0176] Table 1A, First Embodiment surface radius of curvature thickness Material Refractive index Abbe number focal length 0 Subject flat D0 1 First lens 20.3611 (SPH) 2.267 Glass 1.561 58.3 83.77 2 34.5049 (SPH) 0.033 3 Second lens 26.1437 (SPH) 3.505 Glass 1.511 60.5 43.54 4 -142.8571 (SPH) 0.300 5 aperture flat 0.200 6 Third lens 19.7808 (SPH) 1.032 Glass 1.904 31.4 -88.00 7 15.4481 (SPH) 0.625 8 Fourth lens 15.9625 (SPH) 5.642 Glass 1.523 58.7 17.65 9 Fifth lens -19.2491 (SPH) 1.311 Glass 1.850 30.1 -13.30 10 28.2741 (SPH) 0.126 11 Sixth lens 29.7459 (ASP) 1.060 plastic 1.705 14.0 128.71 12 43.6060 (ASP) 11.505 13 aperture flat 0.300 14 Seventh Lens -22.9103 (SPH) 0.455 Glass 1.804 46.6 -11.17 15 14.8981 (SPH) D1 16 Eighth lens 13.8123 (ASP) 1.434 plastic 1.614 26.0 23.09 17 522.4417 (ASP) D2 18 Filter element flat 0.510 Glass 1.517 64.2 - 19 flat 6.505 20 Imaging surface flat - The reference wavelength (d-line) is 587.6 nm. The effective radius of surface 13 (aperture S1) is 3.510 mm.

[0177] Table 1A contains detailed structural data for the first embodiment, where the units for radius of curvature, thickness, and focal length are millimeters (mm), and surfaces 0 to 20 sequentially represent the surfaces along the optical axis from the object side to the image side.

[0178] Table 1B: Parameters in the first and second shooting states First shooting state Second shooting state fL [millimeters] 64.50 fS [millimeters] 63.82 FnoL 3.00 FnoS 2.97 HFOVL [degree] 3.8 HFOVS [degree] 3.8 Object distance [millimeters] unlimited Object distance [millimeters] 10000.000 D0 [millimeters] unlimited D0 [millimeters] 10000.000 D1 [millimeters] 5.855 D1 [millimeters] 5.330 D2 [millimeters] 4.445 D2 [millimeters] 4.970

[0179] Table 1B contains parameters for the first and second shooting states of the camera optical system assembly under different focusing conditions. It should be understood that this embodiment only discloses two focusing states, such as the first and second shooting states, but this disclosure is not limited to the disclosed states, and the camera optical system assembly of this embodiment may have other focusing states with different focal lengths in addition to the first and second shooting states, to correspond to other focusing states with different object distances.

[0180] As can be seen from Tables 1A and 1B, the eighth lens E8 moves along the optical axis during the focusing process.

[0181] Table 1C, Aspheric Coefficient surface 11 12 16 17 k = -2.92320E+00 -4.56667E+01 2.66046E+00 9.90000E+01 A4 = -4.3913E-05 -2.1970E-05 2.0580E-04 4.5554E-04 A6 = -1.5809E-06 -2.8242E-06 5.3709E-06 2.2429E-05 A8 = 1.1903E-07 1.6842E-07 5.2569E-07 -2.2003E-06 A10 = -3.5854E-09 -5.3715E-09 2.2145E-08 3.4340E-07 A12 = 7.6255E-11 1.1925E-10 -3.9107E-09 -2.3977E-08 A14 = -8.4896E-13 -1.4260E-12 2.0826E-10 8.5086E-10 A16 = 5.0141E-15 8.6501E-15 -2.7096E-12 -9.9586E-12

[0182] Table 1C shows the aspherical data in the first embodiment, where k is the conical coefficient in the aspherical curve equation, and A4 to A16 represent the 4th to 16th order aspherical coefficients of each surface.

[0183] In addition, the tables in 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.

[0184] <Second Implementation Example>

[0185] 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 shooting state and the second shooting 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 shooting 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 shooting state. The upper half of Figure 4 is a schematic diagram of the imaging optical system assembly in the first shooting state, while the lower half of Figure 4 is a schematic diagram of the imaging optical system assembly in the second shooting state. As shown in Figure 4, the imaging device 2 includes an imaging optical system assembly (unlabeled) and an electronic photosensitive element IS. The imaging optical system assembly, along the optical path from the object side to the image side, includes, in sequence, a first lens E1, an aperture ST, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an aperture stop S1, an eighth lens E8, a ninth lens E9, a filter element E10, and an imaging plane IMG. Furthermore, the camera optical system assembly is configured along the optical path from the object side to the image side as a first lens group A1, an aperture ST, and a second lens group A2. The first lens group A1 includes a first lens E1, and the second lens group A2 includes a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, and a ninth lens E9. The electronic image sensor IS is mounted on the imaging plane IMG. The camera optical system assembly comprises nine lenses (E1, E2, E3, E4, E5, E6, E7, E8, and E9), and there are no other interposed lenses between the lenses.

[0186] In the camera optical system assembly of the second embodiment, the first to ninth lenses, counted from the object side, are respectively the first lens E1 to the ninth lens E9, and the first to ninth lenses, counted from the image side, correspond to the ninth lens E9 to the first lens E1, wherein the ninth lens E9 can also be referred to as the last lens.

[0187] The camera optical system assembly of the second embodiment performs a focusing process by moving at least one of its lenses. The camera optical system assembly, through the focusing process, has a first shooting state corresponding to an infinity object distance and a second shooting state corresponding to a finite object distance of 10,000.000 mm. The first shooting state is the state of the camera optical system assembly when the subject is at infinity (infinity object distance), and the second shooting state is the state of the camera optical system assembly when the subject is at a finite object distance (finite object distance). When the subject moves from infinity to a finite object distance, the camera optical system assembly performs a focusing process to change from the first shooting state to the second shooting state. Conversely, when the subject moves from a finite object distance to infinity, the camera optical system assembly also performs a focusing process to change from the second shooting state to the first shooting state. During the focusing process, the eighth lens E8 of the camera optical system assembly moves along the optical axis.

[0188] The first lens group A1 has positive refractive power, and the second lens group A2 has negative refractive power.

[0189] 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 concave near the optical axis. Both of its surfaces are spherical.

[0190] 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.

[0191] The third lens E3 has negative 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 spherical.

[0192] The fourth lens E4 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.

[0193] The fifth lens, E5, has negative refractive power and is made of glass. Its object-side surface is concave near the optical axis, and its image-side surface is also concave near the optical axis. Both surfaces are spherical. The object-side surface of the fifth lens, E5, is bonded to the image-side surface of the fourth lens, E4.

[0194] The sixth lens, E6, 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.

[0195] The seventh lens E7 has negative refractive power and is made of glass. 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 spherical.

[0196] The eighth lens, E8, 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.

[0197] The ninth lens, E9, 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.

[0198] The filter element E10 is made of glass and is located between the ninth lens E9 and the imaging surface IMG. It does not affect the focal length of the camera optical system group.

[0199] In the camera optical system group, the lens with the smallest effective radius among all lenses at the corresponding infinity object distance is the seventh lens, E7.

[0200] The maximum distance between all adjacent lenses in the camera optical system group on the optical axis is located between the seventh lens E7 and the eighth lens E8.

[0201] In the second lens group A2, the third lens E3 is a convex-concave lens. The fourth lens E4, a biconvex positive lens, and the fifth lens E5, a biconcave negative lens, combine to form an achromatic lens group with negative refractive power. The sixth lens E6 is an aspherical lens.

[0202] Please refer to Tables 2A to 2D below.

[0203] Table 2A, Second Embodiment surface radius of curvature thickness Material Refractive index Abbe number focal length 0 Subject flat D0 1 First lens 19.9601 (SPH) 3.889 Glass 1.729 54.7 38.76 2 62.3656 (SPH) 1.161 3 aperture flat -1.001 4 Second lens 13.8848 (ASP) 3.831 plastic 1.511 56.8 64.63 5 21.7243 (ASP) 2.463 6 Third lens 14.9512 (SPH) 1.002 Glass 1.923 18.9 -38.49 7 10.1836 (SPH) 0.962 8 Fourth lens 13.7279 (SPH) 5.168 Glass 1.639 55.4 12.32 9 Fifth lens -15.7194 (SPH) 1.867 Glass 1.904 31.4 -5.03 10 6.7538 (SPH) 0.030 11 Sixth lens 6.3549 (ASP) 2.766 plastic 1.669 19.5 8.89 12 -76.1158 (ASP) 0.974 13 Seventh Lens -57.3437 (SPH) 0.502 Glass 1.946 17.9 -10.36 14 11.8677 (SPH) 0.640 15 aperture flat D1 16 Eighth lens 27.2825 (ASP) 0.687 plastic 1.705 14.0 143.01 17 37.0186 (ASP) D2 18 Ninth Lens 17.1843 (ASP) 1.104 plastic 1.705 14.0 36.64 19 50.0073 (ASP) 5.000 20 Filter element flat 0.510 Glass 1.517 64.2 - twenty one flat 1.464 twenty two Imaging surface flat - The reference wavelength (d-line) is 587.6 nm. The effective radius of surface 15 (aperture S1) is 3.756 mm.

[0204] Table 2B: Parameters in the first and second shooting states First shooting state Second shooting state fL [millimeters] 57.89 fS [millimeters] 57.41 FnoL 2.43 FnoS 2.41 HFOVL [degree] 4.9 HFOVS [degree] 4.9 Object distance [millimeters] unlimited Object distance [millimeters] 10000.000 D0 [millimeters] unlimited D0 [millimeters] 10000.000 D1 [millimeters] 9.678 D1 [millimeters] 6.596 D2 [millimeters] 0.410 D2 [millimeters] 3.492

[0205] The definitions in Table 2B are the same as in the first embodiment, except that D1 is the distance on the optical axis between the aperture stop S1 and the object-side surface of the eighth lens E8, and D2 is the distance on the optical axis between the image-side surface of the eighth lens E8 and the object-side surface of the ninth lens E9. Furthermore, in addition to the first and second shooting states, the camera optical system assembly of this embodiment can also have other focusing states with different focal lengths to correspond to focusing states with different object distances.

[0206] As can be seen from Tables 2A and 2B, the eighth lens E8 moves along the optical axis during the focusing process.

[0207] Table 2C, Aspheric Coefficient surface 4 5 11 12 k = 4.20405E-02 3.43578E-01 -3.26418E-01 -9.90000E+01 A4 = 3.8365E-06 4.3189E-06 2.5073E-05 -5.7152E-05 A6 = -1.6992E-08 -1.1977E-07 5.8357E-06 1.4429E-05 A8 = 5.4309E-10 2.0050E-09 -4.7992E-07 -2.8119E-06 A10 = 2.0575E-13 [[ID=#36]] -1.1689E-11 -4.7173E-09 3.0386E-07 A12 = 1.0802E-14 -1.1776E-14 4.0226E-09 -1.7705E-08 A14 = - - -2.5719E-10 5.1396E-10 A16 = - - 5.3371E-12 -5.3062E-12 Surface 16 17 18 19 k = -3.98983E+00 3.27462E+01 -1.01468E+01 3.18283E+01 A4 = 3.7315E-04 3.5615E-04 3.6269E-04 -3.8430E-06 A6 = -4.9775E-05 -6.7730E-05 -3.2135E-05 -1.7031E-05 A8 = 5.7475E-06 7.4792E-06 2.5720E-06 1.3919E-06 A10 = -4.0134E-07 -5.0556E-07 -1.3768E-07 -8.1538E-08 A12 = 1.5187E-08 1.8607E-08 4.6635E-09 3.4379E-09 A14 = -2.9010E-10 -3.4820E-10 -9.1695E-11 -8.8869E-11 A16 = 2.1801E-12 2.5575E-12 6.5292E-13 8.4928E-13

[0208] The equations for the aspherical surfaces in Table 2C are expressed in the form of the first embodiment.

[0209] Table 2D, Polynomial Data fL [millimeters] 57.89 f4 / f2 0.19 FnoL 2.43 flast2 / f3 -3.72 HFOVL [degree] 4.9 f12 / f23 -0.15 FOVL [degree] 9.8 f12 / f56 -1.84 fS [millimeters] 57.41 (R5+R6) / fL 0.43 FnoS 2.41 (R1-R3) / (R1+R3) 0.18 HFOVS [degree] 4.9 R5 / Rlast2 0.87 FOVS [degree] 9.8 CTmax / ATLmax 0.50 EPD (millimeters) 23.82 CTlast2 / CT1 0.18 ImgH [milliliters] 5.00 T12 / T23 0.06 fA1 [millimeters] 38.76 (T56+CT6) / (CT4+CT5) 0.40 fA2 [millimeters] -63.19 ATLmax / ImgH 2.06 fL / EPD 2.43 V6 / N6 11.68 MIN(fL / fi) -11.51 2×ImgH / EPD 0.42 MIN(fL / f5,fL / f6) -11.51 fL / (CRAL+HFOVL) [millimeters / degree] 5.75 fL / TL 1.34 ETL3 / CT3 1.50 fL / fA1 1.49 ETLlast / CTlast 0.46 fL / f2 0.90 10×T12 / ETL12 0.42 |fL / f3| 1.50 YL1R1 / YL8R2 2.25 fL / f4 4.70 (YLA1Rlast-YLA2R1) / ETLA12 0.34

[0210] The definitions described in Table 2D are the same as those in the first embodiment.

[0211] <Third Embodiment>

[0212] Please refer to Figures 7 to 9. Figure 7 illustrates schematic diagrams of the imaging device according to the third embodiment of this disclosure in the first shooting state and the second shooting state, respectively. 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 shooting state, and 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 shooting state. The upper half of Figure 7 is a schematic diagram of the imaging optical system assembly in the first shooting state, while the lower half of Figure 7 is a schematic diagram of the imaging optical system assembly in the second shooting state. As shown in Figure 7, the imaging device 3 includes an imaging optical system assembly (unlabeled) and an electronic photosensitive element IS. The imaging optical system assembly, along the optical path from the object side to the image side, includes, in sequence, a first lens E1, a second lens E2, an aperture ST, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an aperture stop S1, an eighth lens E8, a filter element E10, and an imaging plane IMG. Furthermore, the camera optical system assembly is configured along the optical path from the object side to the image side as a first lens group A1, an aperture ST, and a second lens group A2. The first lens group A1 includes a first lens E1 and a second lens E2, and the second lens group A2 includes a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. The electronic image sensor IS is mounted on the imaging plane IMG. The camera optical system assembly comprises eight lenses (E1, E2, E3, E4, E5, E6, E7, and E8), and there are no other interposed lenses between the lenses.

[0213] In the camera optical system group of the third embodiment, the first to eighth lenses, counted from the object side, are respectively the first lens E1 to the eighth lens E8, and the first to eighth lenses, counted from the image side, correspond to the eighth lens E8 to the first lens E1, wherein the eighth lens E8 can also be referred to as the last lens.

[0214] The camera optical system assembly of the third embodiment performs a focusing process by moving at least one of its lenses. The camera optical system assembly, through the focusing process, has a first shooting state corresponding to an infinity object distance and a second shooting state corresponding to a finite object distance of 10,000.000 mm. The first shooting state is the state of the camera optical system assembly when the subject is at infinity (infinity object distance), and the second shooting state is the state of the camera optical system assembly when the subject is at a finite object distance (finite object distance). When the subject moves from infinity to a finite object distance, the camera optical system assembly performs a focusing process to change from the first shooting state to the second shooting state. Conversely, when the subject moves from a finite object distance to infinity, the camera optical system assembly also performs a focusing process to change from the second shooting state to the first shooting state. During the focusing process, the eighth lens E8 of the camera optical system assembly moves along the optical axis.

[0215] The first lens group A1 has positive refractive power, and the second lens group A2 has negative refractive power.

[0216] 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 concave near the optical axis. Both of its surfaces are spherical.

[0217] 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 spherical.

[0218] The third lens E3 has negative 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 spherical.

[0219] The fourth lens E4 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.

[0220] The fifth lens, E5, has negative refractive power and is made of glass. Its object-side surface is concave near the optical axis, and its image-side surface is also concave near the optical axis. Both surfaces are spherical. The object-side surface of the fifth lens, E5, is bonded to the image-side surface of the fourth lens, E4.

[0221] The sixth lens, E6, 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.

[0222] The seventh lens, E7, has negative refractive power and is made of glass. 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 spherical.

[0223] The eighth lens, E8, 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.

[0224] The filter element E10 is made of glass and is located between the eighth lens E8 and the imaging surface IMG. It does not affect the focal length of the camera optical system group.

[0225] In the camera optical system group, the lens with the smallest effective radius among all lenses at the corresponding infinity object distance is the seventh lens, E7.

[0226] The maximum distance between all adjacent lenses in the camera optical system group on the optical axis is located between the sixth lens E6 and the seventh lens E7.

[0227] In the second lens group A2, the third lens E3 is a convex-concave lens. The fourth lens E4, a biconvex positive lens, and the fifth lens E5, a biconcave negative lens, combine to form an achromatic lens group with negative refractive power. The sixth lens E6 is an aspherical lens.

[0228] Please refer to Tables 3A to 3D below.

[0229] Table 3A, Third Embodiment surface radius of curvature thickness Material Refractive index Abbe number focal length 0 Subject flat D0 1 First lens 21.2440 (SPH) 3.240 Glass 1.497 81.6 78.01 2 44.6151 (SPH) 0.076 3 Second lens 17.7382 (SPH) 4.414 Glass 1.437 95.1 48.60 4 99.5304 (SPH) 0.636 5 aperture flat 1.001 6 Third lens 11.9876 (SPH) 1.916 Glass 1.911 35.2 -64.88 7 9.2067 (SPH) 1.359 8 Fourth lens 11.9780 (SPH) 4.825 Glass 1.497 81.6 18.79 9 Fifth lens -36.7354 (SPH) 1.165 Glass 1.904 31.3 -8.50 10 9.8649 (SPH) 0.073 11 Sixth lens 8.6824 (ASP) 2.255 plastic 1.661 20.4 24.94 12 16.4359 (ASP) 12.541 13 Seventh Lens -9.0218 (SPH) 0.784 Glass 1.850 32.3 -11.24 14 -167.4416 (SPH) D1 15 aperture flat -0.700 16 Eighth lens 15.3038 (ASP) 1.553 plastic 1.661 20.4 16.32 17 -35.1048 (ASP) D2 18 Filter element flat 0.510 Glass 1.517 64.2 - 19 flat 5.710 20 Imaging surface flat - The reference wavelength (d-line) is 587.6 nm. The effective radius of surface 15 (aperture S1) is 4.210 mm.

[0230] Table 3B: Parameters in the first and second shooting states First shooting state Second shooting state fL [millimeters] 65.64 fS [millimeters] 64.29 FnoL 2.75 FnoS 2.69 HFOVL [degree] 3.4 HFOVS [degree] 3.4 Object distance [millimeters] unlimited Object distance [millimeters] 10000.000 D0 [millimeters] unlimited D0 [millimeters] 10000.000 D1 [millimeters] 4.388 D1 [millimeters] 3.791 D2 [millimeters] 0.296 D2 [millimeters] 0.893

[0231] The definitions in Table 3B are the same as in the first embodiment, except that D1 is the distance on the optical axis between the image-side surface of the seventh lens E7 and the aperture stop S1. Furthermore, in addition to the first and second shooting states, the camera optical system assembly of this embodiment can also have other focusing states with different focal lengths to correspond to other focusing states with different object distances.

[0232] As can be seen from Tables 3A and 3B, the aperture stop S1 and the eighth lens E8 move along the optical axis during the focusing process.

[0233] Table 3C, Aspheric Coefficient surface 11 12 16 17 k = -6.38277E-02 6.90202E-01 8.27428E+00 1.52538E+01 A4 = 3.8853E-06 -9.0953E-06 -7.2809E-05 4.0993E-04 A6 = -5.5466E-07 -1.5266E-06 7.9445E-06 1.2727E-05 A8 = -5.7191E-08 -6.9651E-09 -3.3694E-07 6.3072E-07 A10 = 1.9122E-09 -1.4977E-09 9.3186E-10 -6.6690E-08 A12 = -7.4801E-11 -2.1013E-11 5.1382E-10 3.1567E-09

[0234] The equations for the aspherical surfaces in Table 3C are expressed in the form of the first embodiment.

[0235] Table 3D, Polynomial Data fL [millimeters] 65.64 f4 / f2 0.39 FnoL 2.75 flast2 / f3 0.17 HFOVL [degree] 3.4 f12 / f23 0.27 FOVL [degree] 6.8 f12 / f56 -2.55 fS [millimeters] 64.29 (R5+R6) / fL 0.32 FnoS 2.69 (R1-R3) / (R1+R3) 0.09 HFOVS [degree] 3.4 R5 / Rlast2 0.78 FOVS [degree] 6.8 CTmax / ATLmax 0.38 EPD [mm] 23.88 CTlast2 / CT1 0.24 ImgH [mm] 3.96 T12 / T23 0.05 fA1 [mm] 30.76 (T56+CT6) / (CT4+CT5) 0.39 fA2 [mm] -34.59 ATLmax / ImgH 3.17 fL / EPD 2.75 V6 / N6 12.28 MIN(fL / fi) -7.72 <00016​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​ 2.92 fL / f4 3.49 (YLA1Rlast-YLA2R1) / ETLA12 0.43

[0236] The definitions described in Table 3D are the same as those in the first embodiment.

[0237] <Fourth Embodiment>

[0238] Please refer to Figures 10 to 12. Figure 10 illustrates schematic diagrams of the imaging device according to the fourth embodiment of this disclosure in the first shooting state and the second shooting 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 shooting 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 shooting state. The upper half of Figure 10 is a schematic diagram of the imaging optical system assembly in the first shooting state, while the lower half of Figure 10 is a schematic diagram of the imaging optical system assembly in the second shooting state. As shown in Figure 10, the imaging device 4 includes an imaging optical system assembly (unlabeled) and an electronic photosensitive element IS. The imaging optical system assembly, along the optical path from the object side to the image side, includes, in sequence, a first lens E1, an aperture ST, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an aperture stop S1, an eighth lens E8, a filter element E10, and an imaging plane IMG. Furthermore, the camera optical system assembly is configured along the optical path from the object side to the image side as a first lens group A1, an aperture ST, and a second lens group A2. The first lens group A1 includes a first lens E1, and the second lens group A2 includes a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. The electronic image sensor IS is mounted on the imaging plane IMG. The camera optical system assembly comprises eight lenses (E1, E2, E3, E4, E5, E6, E7, and E8), and there are no other interposed lenses between the lenses.

[0239] In the camera optical system assembly of the fourth embodiment, the first to eighth lenses, counted from the object side, are respectively the first lens E1 to the eighth lens E8, and the first to eighth lenses, counted from the image side, correspond to the eighth lens E8 to the first lens E1, wherein the eighth lens E8 can also be referred to as the last lens.

[0240] In the fourth embodiment, the camera optical system assembly performs a focusing process by moving at least one of its lenses. The camera optical system assembly, through the focusing process, has a first shooting state corresponding to an infinity object distance and a second shooting state corresponding to a finite object distance of 9000.000 mm. The first shooting state is the state of the camera optical system assembly when the subject is at infinity (infinity object distance), and the second shooting state is the state of the camera optical system assembly when the subject is at a finite object distance (finite object distance). When the subject moves from infinity to a finite object distance, the camera optical system assembly performs a focusing process to change from the first shooting state to the second shooting state. Conversely, when the subject moves from a finite object distance to infinity, the camera optical system assembly also performs a focusing process to change from the second shooting state to the first shooting state. During the focusing process, the eighth lens E8 of the camera optical system assembly moves along the optical axis.

[0241] The first lens group A1 has positive refractive power, and the second lens group A2 has negative refractive power.

[0242] 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 concave near the optical axis. Both of its surfaces are spherical.

[0243] 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 spherical.

[0244] The third lens E3 has negative 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 spherical.

[0245] The fourth lens E4 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.

[0246] The fifth lens, E5, has negative refractive power and is made of glass. Its object-side surface is concave near the optical axis, and its image-side surface is also concave near the optical axis. Both surfaces are spherical. The object-side surface of the fifth lens, E5, is bonded to the image-side surface of the fourth lens, E4.

[0247] The sixth lens, E6, 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.

[0248] The seventh lens E7 has negative refractive power and is made of glass. 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 spherical.

[0249] The eighth lens, E8, 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.

[0250] The filter element E10 is made of glass and is located between the eighth lens E8 and the imaging surface IMG. It does not affect the focal length of the camera optical system group.

[0251] In the camera optical system group, the lens with the smallest effective radius among all lenses at the corresponding infinity object distance is the seventh lens, E7.

[0252] The maximum distance between all adjacent lenses in the camera optical system group on the optical axis is located between the seventh lens E7 and the eighth lens E8.

[0253] In the second lens group A2, the third lens E3 is a convex-concave lens. The fourth lens E4, a biconvex positive lens, and the fifth lens E5, a biconcave negative lens, combine to form an achromatic lens group with negative refractive power. The sixth lens E6 is an aspherical lens.

[0254] Please refer to Tables 4A to 4D below.

[0255] Table 4A, Fourth Embodiment surface radius of curvature thickness Material Refractive index Abbe number focal length 0 Subject flat D0 1 First lens 18.1585 (SPH) 3.162 Glass 1.729 54.7 32.59 2 71.3679 (SPH) 0.787 3 aperture flat -0.557 4 Second lens 13.5050 (SPH) 3.494 Glass 1.511 60.5 39.35 5 37.5036 (SPH) 2.268 6 Third lens 22.2147 (SPH) 0.660 Glass 1.946 17.9 -39.40 7 13.7173 (SPH) 2.628 8 Fourth lens 22.1527 (SPH) 3.475 Glass 1.511 60.5 16.28 9 Fifth lens -12.6183 (SPH) 1.254 Glass 1.923 18.9 -10.03 10 36.4309 (SPH) 0.951 11 Sixth lens 20.4555 (ASP) 1.299 plastic 1.705 14.0 13.90 12 -18.3195 (ASP) 0.068 13 Seventh Lens -31.6613 (SPH) 0.767 Glass 1.802 45.5 -7.26 14 7.2114 (SPH) 0.950 15 Aperture flat D1 16 Eighth lens 12.2711 (ASP) 0.909 plastic 1.642 22.5 43.79 17 21.1544 (ASP) D2 18 Filter element flat 0.510 Glass 1.517 64.2 - 19 flat 5.124 20 Imaging surface flat - The reference wavelength (d-line) is 587.6 nm. The effective radius of surface 15 (aperture S1) is 3.505 mm.

[0256] Table 4B: Parameters in the first and second shooting states First shooting state Second shooting state fL [millimeters] 54.07 fS [millimeters] 53.40 FnoL 2.70 FnoS 2.67 HFOVL [degree] 4.3 HFOVS [degree] 4.3 Object distance [millimeters] unlimited Object distance [millimeters] 9000.000 D0 [millimeters] unlimited D0 [millimeters] 9000.000 D1 [millimeters] 5.858 D1 [millimeters] 5.131 D2 [millimeters] 3.992 D2 [millimeters] 4.719

[0257] The definitions in Table 4B are the same as in the first embodiment, except that D1 is the distance on the optical axis between the aperture stop S1 and the object-side surface of the eighth lens E8, and the finite object distances corresponding to fS, FnoS, and HFOVS are 9000.000 mm. Furthermore, in addition to the first and second shooting states, the camera optical system assembly of this embodiment can also have other focusing states with different focal lengths to correspond to other focusing states with different object distances.

[0258] As can be seen from Tables 4A and 4B, the eighth lens E8 moves along the optical axis during the focusing process.

[0259] Table 4C, Aspheric Coefficient surface 11 12 16 17 k = -1.31972E+01 1.34498E+01 -9.74313E-01 1.99020E+01 A4 = -5.6087E-04 -5.1090E-04 -1.5805E-04 -5.1155E-04 A6 = -1.1798E-05 2.5127E-05 8.3552E-05 1.0006E-04 A8 = 3.0565E-06 1.8560E-06 -1.5081E-05 -2.1299E-05 A10 = -4.5278E-07 -4.9968E-07 2.7502E-06 3.6739E-06 A12 = 2.9674E-08 4.7557E-08 -2.8074E-07 -3.6245E-07 A14 = -7.5974E-10 -1.9927E-09 1.6312E-08 2.0158E-08 A16 = 5.4755E-13 2.9638E-11 -4.8914E-10 -5.6362E-10 A18 = - - 5.8739E-12 5.9299E-12

[0260] The equations for the aspherical surfaces in Table 4C are expressed in the form of the first embodiment.

[0261] Table 4D, Polynomial Data fL [million millimeters] 54.07 f4 / f2 0.41 FnoL 2.70 flast2 / f3 0.18 HFOVL [degree] 4.3 f12 / f23 0.08 FOVL [degree] 8.6 f12 / f56 -0.27 fS [millimeters] 53.40 (R5+R6) / fL 0.66 FnoS 2.67 (R1-R3) / (R1+R3) 0.15 HFOVS [degree] 4.3 R5 / Rlast2 1.81 FOVS [degree] 8.6 CTmax / ATLmax 0.51 EPD (millimeters) 20.03 CTlast2 / CT1 0.24 ImgH [milliliters] 4.15 T12 / T23 0.10 fA1 [millimeters] 32.59 (T56+CT6) / (CT4+CT5) 0.48 fA2 [millimeters] -23.46 ATLmax / ImgH 1.64 fL / EPD 2.70 V6 / N6 8.21 MIN(fL / fi) -7.45 2×ImgH / EPD 0.41 MIN(fL / f5,fL / f6) -5.39 fL / (CRAL+HFOVL) [millimeters / degree] 4.13 fL / TL 1.44 ETL3 / CT3 1.70 fL / fA1 1.66 ETLlast / CTlast 0.58 fL / f2 1.37 10×T12 / ETL12 0.80 |fL / f3| 1.37 YL1R1 / YL8R2 2.41 fL / f4 3.32 (YLA1Rlast-YLA2R1) / ETLA12 0.32

[0262] The definitions described in Table 4D are the same as those in the first embodiment.

[0263] <Fifth Embodiment>

[0264] Please refer to Figures 13 to 15. Figure 13 illustrates schematic diagrams of the imaging device according to the fifth embodiment of this disclosure in a first shooting state and a second shooting state. 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 shooting 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 shooting state. The upper half of Figure 13 is a schematic diagram of the camera optical system assembly in the first shooting state, and the lower half of Figure 13 is a schematic diagram of the camera optical system assembly in the second shooting state. As shown in Figure 13, the imaging device 5 includes a camera optical system assembly (unless otherwise labeled) and an electronic photosensitive element IS. The camera optical system assembly, arranged sequentially from the object side to the image side along the optical path, includes a first lens E1, a second lens E2, an aperture ST, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an aperture stop S1, a seventh lens E7, an eighth lens E8, a ninth lens E9, a filter element E10, and an imaging surface IMG. More specifically, the camera optical system assembly, arranged sequentially from the object side to the image side along the optical path, has a first lens group A1, an aperture ST, and a second lens group A2. The first lens group A1 includes the first lens E1 and the second lens E2, and the second lens group A2 includes the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, and the ninth lens E9. The electronic image sensor IS is disposed on the imaging surface IMG. The camera optical system assembly comprises nine lenses (E1, E2, E3, E4, E5, E6, E7, E8, E9), and there are no other interposed lenses between the lenses.

[0265] In the camera optical system assembly of the fifth embodiment, the first to ninth lenses, counted from the object side, are respectively the first lens E1 to the ninth lens E9, and the first to ninth lenses, counted from the image side, correspond to the ninth lens E9 to the first lens E1, wherein the ninth lens E9 can also be referred to as the last lens.

[0266] The camera optical system assembly of the fifth embodiment performs a focusing process by moving at least one of its lenses. The camera optical system assembly, through the focusing process, has a first shooting state corresponding to an infinity object distance and a second shooting state corresponding to a finite object distance of 9000.000 mm. The first shooting state is the state of the camera optical system assembly when the subject is at infinity (infinity object distance), and the second shooting state is the state of the camera optical system assembly when the subject is at a finite object distance (finite object distance). When the subject moves from infinity to a finite object distance, the camera optical system assembly performs a focusing process to change from the first shooting state to the second shooting state. Conversely, when the subject moves from a finite object distance to infinity, the camera optical system assembly also performs a focusing process to change from the second shooting state to the first shooting state. During the focusing process, the ninth lens E9 of the camera optical system assembly moves along the optical axis.

[0267] The first lens group A1 has positive refractive power, and the second lens group A2 has negative refractive power.

[0268] 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 concave near the optical axis. Both of its surfaces are spherical.

[0269] 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.

[0270] The third lens E3 has negative 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 spherical.

[0271] The fourth lens E4 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.

[0272] The fifth lens, E5, has negative refractive power and is made of glass. Its object-side surface is concave near the optical axis, and its image-side surface is also concave near the optical axis. Both surfaces are spherical. The object-side surface of the fifth lens, E5, is bonded to the image-side surface of the fourth lens, E4.

[0273] The sixth lens, E6, 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.

[0274] The seventh lens E7 has negative 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 spherical.

[0275] The eighth lens, E8, 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.

[0276] The ninth lens, E9, 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.

[0277] The filter element E10 is made of glass and is located between the ninth lens E9 and the imaging surface IMG. It does not affect the focal length of the camera optical system group.

[0278] In the camera optical system group, the lens with the smallest effective radius among all lenses at the corresponding infinity object distance is the seventh lens, E7.

[0279] The maximum distance between all adjacent lenses in the camera optical system group on the optical axis is located between the sixth lens E6 and the seventh lens E7.

[0280] In the second lens group A2, the third lens E3 is a convex-concave lens. The fourth lens E4, a biconvex positive lens, and the fifth lens E5, a biconcave negative lens, combine to form an achromatic lens group with negative refractive power. The sixth lens E6 is an aspherical lens.

[0281] Please refer to Tables 5A to 5D below.

[0282] Table 5A, Fifth Embodiment surface radius of curvature thickness Material Refractive index Abbe number focal length 0 Subject flat D0 1 First lens 26.0145 (SPH) 3.623 Glass 1.729 54.7 51.13 2 81.0200 (SPH) 0.110 3 Second lens 20.1290 (ASP) 3.947 Glass 1.530 60.5 53.76 4 63.8336 (ASP) 1.458 5 aperture flat 0.470 6 Third lens 15.7597 (SPH) 1.125 Glass 1.904 31.4 -76.79 7 12.4078 (SPH) 0.620 8 Fourth lens 12.7326 (SPH) 5.057 Glass 1.511 60.5 20.83 9 Fifth lens -56.2589 (SPH) 1.278 Glass 1.904 31.4 -7.72 10 8.0441 (SPH) 0.051 11 Sixth lens 8.5350 (ASP) 2.881 plastic 1.511 56.8 25.70 12 21.6003 (ASP) 6.358 13 Aperture flat -0.500 14 Seventh Lens 14.7560 (SPH) 0.514 Glass 1.847 23.8 -20.42 15 7.8346 (SPH) 1.591 16 Eighth lens 14.7839 (ASP) 1.062 plastic 1.705 14.0 24.06 17 111.9371 (ASP) D1 18 Ninth Lens -54.6896 (ASP) 0.770 plastic 1.511 56.8 -117.03 19 -644.5955 (ASP) D2 20 Filter element flat 0.300 Glass 1.517 64.2 - twenty one flat 7.595 twenty two Imaging surface flat - The reference wavelength (d-line) is 587.6 nm. The effective radius of surface 13 (aperture S1) is 4.118 mm.

[0283] Table 5B: Parameters in the first and second shooting states First shooting state Second shooting state fL [millimeters] 66.23 fS [millimeters] 65.16 FnoL 2.50 FnoS 2.46 HFOVL [degree] 3.8 HFOVS [degree] 3.8 Object distance [millimeters] unlimited Object distance [millimeters] 9000.000 D0 [millimeters] unlimited D0 [millimeters] 9000.000 D1 [millimeters] 0.549 D1 [millimeters] 2.239 D2 [millimeters] 8.240 D2 [millimeters] 6.550

[0284] The definitions in Table 5B are the same as in the first embodiment, except that D1 is the distance on the optical axis between the image-side surface of the eighth lens E8 and the object-side surface of the ninth lens E9, D2 is the distance on the optical axis between the image-side surface of the ninth lens E9 and the filter element E10, and the finite object distance corresponding to fS, FnoS, and HFOVS is 9000.000 mm. Furthermore, the camera optical system assembly of this embodiment can also have other focusing states with different focal lengths in addition to the first and second shooting states, to correspond to other focusing states with different object distances.

[0285] As can be seen from Tables 5A and 5B, the ninth lens E9 moves along the optical axis during focusing.

[0286] Table 5C, Aspheric Coefficient surface 3 4 11 12 k = 2.48880E-01 1.61206E+01 3.38102E-02 -4.47643E+00 A4 = 3.8470E-06 1.2479E-05 1.6569E-04 2.0179E-04 A6 = 1.3877E-08 -4.3461E-08 8.2993E-07 -1.9529E-06 A8 = 8.3690E-11 -8.1920E-10 -1.4155E-07 -5.7933E-08 A10 = -1.9402E-12 6.8728E-12 4.4846E-09 3.9432E-09 A12 = 1.1551E-14 -1.7740E-14 -3.6257E-11 -4.5946E-11 Surface 16 17 18 19 k = 4.21003E-02 -9.90000E+01 -5.20561E+01 -9.90000E+01 A4 = 3.6548E-04 2.8508E-04 4.4295E-04 4.0803E-04 A6 = -1.7408E-05 -2.6624E-05 8.2779E-06 3.1870E-05 A8 = 9.4713E-07 1.5429E-06 -2.0372E-06 -4.9738E-06 A10 = 3.9074E-08 2.6243E-08 1.9074E-07 4.0311E-07 A12 = -4.4995E-09 -5.2868E-09 -8.9663E-09 -1.7184E-08 A14 = 1.4338E-10 1.8159E-10 1.6941E-10 3.0124E-10

[0287] The equations for the aspherical surfaces in Table 5C are expressed in the form of the first embodiment.

[0288] Table 5D, Polynomial Data fL [million millimeters] 66.23 f4 / f2 0.39 FnoL 2.50 flast2 / f3 -0.31 HFOVL [degree] 3.8 f12 / f23 0.21 FOVL [degree] 7.6 f12 / f56 -2.56 fS [millimeters] 65.16 (R5+R6) / fL 0.43 FnoS 2.46 (R1-R3) / (R1+R3) 0.13 HFOVS [degree] 3.8 R5 / Rlast2 -0.29 FOVS [degree] 7.6 CTmax / ATLmax 0.86 EPD (millimeters) 26.49 CTlast2 / CT1 0.29 ImgH [milliliters] 4.50 T12 / T23 0.06 fA1 [millimeters] 26.71 (T56+CT6) / (CT4+CT5) 0.46 fA2 [millimeters] -15.71 ATLmax / ImgH 1.30 fL / EPD 2.50 V6 / N6 37.59 MIN(fL / fi) -8.58 2×ImgH / EPD 0.34 MIN(fL / f5,fL / f6) -8.58 fL / (CRAL+HFOVL) [millimeters / degree] 5.31 fL / TL 1.41 ETL3 / CT3 1.22 fL / fA1 2.48 ETLlast / CTlast 1.20 fL / f2 1.23 10×T12 / ETL12 0.33 |fL / f3| 0.86 YL1R1 / YL8R2 3.23 fL / f4 3.18 (YLA1Rlast-YLA2R1) / ETLA12 0.60

[0289] The definitions described in Table 5D are the same as those in the first embodiment.

[0290] <Sixth Embodiment>

[0291] 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 the first shooting state and the second shooting 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 shooting 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 shooting state. The upper part of Figure 16 is a schematic diagram of the imaging optical system assembly in the first shooting state, and the lower part of Figure 16 is a schematic diagram of the imaging optical system assembly in the second shooting state. As shown in Figure 16, the imaging device 6 includes an imaging optical system assembly (unlabeled) and an electronic photosensitive element IS. The imaging optical system assembly, along the optical path from the object side to the image side, includes, in sequence, a first lens E1, a second lens E2, an aperture ST, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an aperture stop S1, an eighth lens E8, a filter element E10, and an imaging plane IMG. Furthermore, the camera optical system assembly is configured along the optical path from the object side to the image side as a first lens group A1, an aperture ST, and a second lens group A2. The first lens group A1 includes a first lens E1 and a second lens E2, and the second lens group A2 includes a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. The electronic image sensor IS is mounted on the imaging plane IMG. The camera optical system assembly comprises eight lenses (E1, E2, E3, E4, E5, E6, E7, and E8), and there are no other interposed lenses between the lenses.

[0292] In the camera optical system assembly of the sixth embodiment, the first to eighth lenses, counted from the object side, are respectively the first lens E1 to the eighth lens E8, and the first to eighth lenses, counted from the image side, correspond to the eighth lens E8 to the first lens E1, wherein the eighth lens E8 can also be referred to as the last lens.

[0293] The camera optical system assembly of the sixth embodiment performs a focusing process by moving at least one of its lenses. The camera optical system assembly, through the focusing process, has a first shooting state corresponding to an infinity object distance and a second shooting state corresponding to a finite object distance of 10000.000 mm. The first shooting state is the state of the camera optical system assembly when the subject is at infinity (infinity object distance), and the second shooting state is the state of the camera optical system assembly when the subject is at a finite object distance (finite object distance). When the subject moves from infinity to a finite object distance, the camera optical system assembly performs a focusing process to change from the first shooting state to the second shooting state. Conversely, when the subject moves from a finite object distance to infinity, the camera optical system assembly also performs a focusing process to change from the second shooting state to the first shooting state. During the focusing process, the eighth lens E8 of the camera optical system assembly moves along the optical axis.

[0294] The first lens group A1 has positive refractive power, and the second lens group A2 has negative refractive power.

[0295] 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 concave near the optical axis. Both of its surfaces are spherical.

[0296] 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 spherical.

[0297] The third lens E3 has negative 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 spherical.

[0298] The fourth lens E4 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.

[0299] The fifth lens, E5, has negative refractive power and is made of glass. Its object-side surface is concave near the optical axis, and its image-side surface is also concave near the optical axis. Both surfaces are spherical. The object-side surface of the fifth lens, E5, is bonded to the image-side surface of the fourth lens, E4.

[0300] The sixth lens, E6, 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.

[0301] The seventh lens E7 has negative refractive power and is made of glass. 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 spherical.

[0302] The eighth lens, E8, 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.

[0303] The filter element E10 is made of glass and is located between the eighth lens E8 and the imaging surface IMG. It does not affect the focal length of the camera optical system group.

[0304] In the camera optical system group, the lens with the smallest effective radius among all lenses at the corresponding infinity object distance is the seventh lens, E7.

[0305] The maximum distance between all adjacent lenses in the camera optical system group on the optical axis is located between the sixth lens E6 and the seventh lens E7.

[0306] In the second lens group A2, the third lens E3 is a convex-concave lens. The fourth lens E4, a biconvex positive lens, and the fifth lens E5, a biconcave negative lens, combine to form an achromatic lens group with negative refractive power. The sixth lens E6 is an aspherical lens.

[0307] Please refer to Tables 6A to 6D below.

[0308] Table 6A, Sixth Embodiment surface radius of curvature thickness Material Refractive index Abbe number focal length 0 Subject flat D0 1 First lens 23.4853 (SPH) 2.603 Glass 1.497 81.6 112.35 2 39.0418 (SPH) 0.075 3 Second lens 16.9160 (SPH) 4.503 Glass 1.550 75.2 39.68 4 68.0123 (SPH) 1.090 5 aperture flat 1.482 6 Third lens 15.1239 (SPH) 2.150 Glass 1.911 35.2 -35.99 7 9.6477 (SPH) 0.343 8 Fourth lens 10.1033 (SPH) 5.688 Glass 1.497 81.6 16.85 9 Fifth lens -39.8129 (SPH) 1.190 Glass 1.904 31.3 -8.08 10 9.0635 (SPH) 0.071 11 Sixth lens 7.7216 (ASP) 2.259 plastic 1.661 20.4 19.18 12 17.4391 (ASP) 11.371 13 Seventh Lens -10.0405 (SPH) 0.792 Glass 1.847 23.8 -9.69 14 46.5259 (SPH) D1 15 Aperture flat -0.700 16 Eighth lens 14.5637 (ASP) 2.274 plastic 1.661 20.4 13.76 17 -22.7550 (ASP) D2 18 Filter element flat 0.510 Glass 1.517 64.2 - 19 flat 5.511 20 Imaging surface flat - The reference wavelength (d-line) is 587.6 nm. The effective radius of surface 15 (aperture S1) is 4.430 mm.

[0309] Table 6B: Parameters in the first and second shooting states First shooting state Second shooting state fL [millimeters] 65.66 fS [millimeters] 64.72 FnoL 2.77 FnoS 2.73 HFOVL [degree] 3.4 HFOVS [degree] 3.4 Object distance [millimeters] unlimited Object distance [millimeters] 10000.000 D0 [millimeters] unlimited D0 [millimeters] 10000.000 D1 [millimeters] 4.381 D1 [millimeters] 3.897 D2 [millimeters] 1.416 D2 [millimeters] 1.900

[0310] The definitions in Table 6B are the same as in the first embodiment, except that D1 is the distance on the optical axis between the image-side surface of the seventh lens E7 and the aperture stop S1. Furthermore, in addition to the first and second shooting states, the camera optical system assembly of this embodiment can also have other focusing states with different focal lengths to correspond to focusing states with other different object distances.

[0311] As can be seen from Tables 6A and 6B, the aperture stop S1 and the eighth lens E8 move along the optical axis during the focusing process.

[0312] Table 6C, Aspheric Coefficient surface 11 12 16 17 k = -3.36083E-01 -1.97890E+00 1.05560E+00 8.98945E-01 A4 = 4.9331E-05 1.2765E-04 7.2966E-05 2.7357E-04 A6 = -6.0791E-07 -1.9031E-06 5.2332E-06 1.0698E-05 A8 = -5.9617E-10 6.3077E-08 3.1041E-07 -1.7168E-07 A10 = 6.1987E-10 -9.1492E-10 -2.8634E-08 2.3100E-09 A12 = -3.6305E-11 -2.3296E-11 6.7528E-10 -2.7112E-10 A14 = 8.5437E-13 -3.2826E-13 3.5631E-11 4.7718E-11 A16 = -2.9386E-14 -4.6518E-15 -1.1027E-12 -1.0335E-12

[0313] The equations for the aspherical surfaces in Table 6C are expressed in the form of the first embodiment.

[0314] Table 6D, Polynomial Data fL [millimeters] 65.66 f4 / f2 0.42 FnoL 2.77 flast2 / f3 0.27 HFOVL [degree] 3.4 f12 / f23 0.14 FOVL [degree] 6.8 f12 / f56 -2.30 fS [millimeters] 64.72 (R5+R6) / fL 0.38 FnoS 2.73 (R1-R3) / (R1+R3) 0.16 HFOVS [degree] 3.4 R5 / Rlast2 1.04 FOVS [degree] 6.8 CTmax / ATLmax 0.50 EPD (millimeters) 23.69 CTlast2 / CT1 0.30 ImgH [milliliters] 3.96 T12 / T23 0.03 fA1 [millimeters] 29.97 (T56+CT6) / (CT4+CT5) 0.34 fA2 [millimeters] -53.76 ATLmax / ImgH 2.87 fL / EPD 2.77 V6 / N6 12.28 MIN(fL / fi) -8.13 2×ImgH / EPD 0.33 MIN(fL / f5,fL / f6) -8.13 fL / (CRAL+HFOVL) [millimeters / degree] 9.47 fL / TL 1.40 ETL3 / CT3 1.24 fL / fA1 2.19 ETLlast / CTlast 0.53 fL / f2 1.65 10×T12 / ETL12 0.29 |fL / f3| 1.82 YL1R1 / YL8R2 2.74 fL / f4 3.90 (YLA1Rlast-YLA2R1) / ETLA12 0.45

[0315] The definitions described in Table 6D are the same as those in the first embodiment.

[0316] <Seventh Embodiment>

[0317] Please refer to Figures 19 to 21. Figure 19 shows schematic diagrams of the imaging device according to the seventh embodiment of this disclosure in the first shooting state and the second shooting state, respectively. Figure 20, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the seventh embodiment in the first shooting state, and Figure 21, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the seventh embodiment in the second shooting state. The upper half of Figure 19 is a schematic diagram of the imaging optical system assembly in the first shooting state, and the lower half of Figure 19 is a schematic diagram of the imaging optical system assembly in the second shooting state. As shown in Figure 19, the imaging device 7 includes an imaging optical system assembly (unlabeled) and an electronic photosensitive element IS. The imaging optical system assembly, along the optical path from the object side to the image side, includes, in sequence, a first lens E1, a second lens E2, an aperture ST, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an aperture stop S1, an eighth lens E8, a filter element E10, and an imaging plane IMG. Furthermore, the camera optical system assembly is configured along the optical path from the object side to the image side as a first lens group A1, an aperture ST, and a second lens group A2. The first lens group A1 includes a first lens E1 and a second lens E2, and the second lens group A2 includes a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. The electronic image sensor IS is mounted on the imaging plane IMG. The camera optical system assembly comprises eight lenses (E1, E2, E3, E4, E5, E6, E7, and E8), and there are no other interposed lenses between the lenses.

[0318] In the camera optical system assembly of the seventh embodiment, the first to eighth lenses, counted from the object side, are respectively the first lens E1 to the eighth lens E8, and the first to eighth lenses, counted from the image side, correspond to the eighth lens E8 to the first lens E1, wherein the eighth lens E8 can also be referred to as the last lens.

[0319] The camera optical system assembly of the seventh embodiment performs a focusing process by moving at least one of its lenses. The camera optical system assembly, through the focusing process, has a first shooting state corresponding to an infinity object distance and a second shooting state corresponding to a finite object distance of 12000.000 mm. The first shooting state is the state of the camera optical system assembly when the subject is at infinity (infinity object distance), and the second shooting state is the state of the camera optical system assembly when the subject is at a finite object distance (finite object distance). When the subject moves from infinity to a finite object distance, the camera optical system assembly performs a focusing process to change from the first shooting state to the second shooting state. Conversely, when the subject moves from a finite object distance to infinity, the camera optical system assembly also performs a focusing process to change from the second shooting state to the first shooting state. During the focusing process, the seventh lens E7 and the eighth lens E8 of the camera optical system assembly move along the optical axis.

[0320] The first lens group A1 has positive refractive power, and the second lens group A2 has negative refractive power.

[0321] 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 concave near the optical axis. Both of its surfaces are spherical.

[0322] 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 spherical.

[0323] The third lens E3 has negative 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 spherical.

[0324] The fourth lens E4 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.

[0325] The fifth lens, E5, has negative refractive power and is made of glass. Its object-side surface is concave near the optical axis, and its image-side surface is also concave near the optical axis. Both surfaces are spherical. The object-side surface of the fifth lens, E5, is bonded to the image-side surface of the fourth lens, E4.

[0326] The sixth lens, E6, 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.

[0327] The seventh lens E7 has negative 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 spherical.

[0328] The eighth lens, E8, 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.

[0329] The filter element E10 is made of glass and is located between the eighth lens E8 and the imaging surface IMG. It does not affect the focal length of the camera optical system group.

[0330] In the camera optical system group, the lens with the smallest effective radius among all lenses at the corresponding infinity object distance is the seventh lens, E7.

[0331] The maximum distance between all adjacent lenses in the camera optical system group on the optical axis is located between the sixth lens E6 and the seventh lens E7.

[0332] In the second lens group A2, the third lens E3 is a convex-concave lens. The fourth lens E4, a biconvex positive lens, and the fifth lens E5, a biconcave negative lens, combine to form an achromatic lens group with negative refractive power. The sixth lens E6 is an aspherical lens.

[0333] Please refer to Tables 7A to 7D below.

[0334] Table 7A, Seventh Embodiment surface radius of curvature thickness Material Refractive index Abbe number focal length 0 Subject flat D0 1 First lens 21.9554 (SPH) 2.435 Glass 1.767 49.2 68.64 2 35.8454 (SPH) 0.063 3 Second lens 19.7362 (SPH) 4.120 Glass 1.511 60.5 48.40 4 90.7286 (SPH) 0.760 5 aperture flat 0.510 6 Third lens 14.3086 (SPH) 0.947 Glass 1.904 31.4 -52.95 7 10.6685 (SPH) 1.174 8 Fourth lens 12.2055 (SPH) 4.846 Glass 1.511 60.5 19.45 9 Fifth lens -46.3513 (SPH) 1.261 Glass 1.847 23.8 -9.07 10 9.3216 (SPH) 0.059 11 Sixth lens 9.0989 (ASP) 2.860 plastic 1.686 18.4 22.92 12 18.8336 (ASP) D1 13 Seventh Lens 43.7560 (SPH) 0.491 Glass 1.804 46.6 -9.32 14 6.3653 (SPH) 1.211 15 Aperture flat -0.830 16 Eighth lens 7.5076 (ASP) 1.451 plastic 1.614 26.0 12.79 17 158.6940 (ASP) D2 18 Filter element flat 0.300 Glass 1.517 64.2 - 19 flat 8.994 20 Imaging surface flat - The reference wavelength (d-line) is 587.6 nm. The effective radius of surface 15 (aperture S1) is 3.625 mm.

[0335] Table 7B: Parameters in the first and second shooting states First shooting state Second shooting state fL [millimeters] 66.00 fS [millimeters] 65.15 FnoL 2.68 FnoS 2.65 HFOVL [degree] 4.0 HFOVS [degree] 4.0 Object distance [millimeters] unlimited Object distance [millimeters] 12000.000 D0 [millimeters] unlimited D0 [millimeters] 12000.000 D1 [millimeters] 10.221 D1 [millimeters] 10.558 D2 [millimeters] 5.646 D2 [millimeters] 5.309

[0336] The definitions in Table 7B are the same as in the first embodiment, except that D1 is the distance on the optical axis between the image-side surface of the sixth lens E6 and the object-side surface of the seventh lens E7, and the finite object distances corresponding to fS, FnoS, and HFOVS are 12000.000 mm. Furthermore, in addition to the first and second shooting states, the camera optical system assembly of this embodiment can also have other focusing states with different focal lengths to correspond to other focusing states with different object distances.

[0337] As can be seen from Tables 7A and 7B, the seventh lens E7, the aperture S1, and the eighth lens E8 move along the optical axis during the focusing process.

[0338] Table 7C, Aspherical Coefficient surface 11 12 16 17 k = -1.97732E-01 -6.52270E+00 -5.26864E-01 8.66773E+01 A4 = 2.6925E-05 1.3555E-04 1.0761E-05 -3.5409E-04 A6 = 9.4388E-08 -1.7930E-06 5.2750E-05 7.1182E-05 A8 = -1.2062E-08 3.0584E-08 -7.7271E-06 -1.1191E-05 A10 = 3.5066E-10 -8.2130E-10 5.4332E-07 7.6666E-07 A12 = -8.1044E-12 3.7131E-12 -1.5571E-08 -2.1773E-08

[0339] The equations for the aspherical surfaces in Table 7C are expressed in the form of the first embodiment.

[0340] Table 7D, Polynomial Data fL [millimeters] 66.00 f4 / f2 0.40 FnoL 2.68 flast2 / f3 0.18 HFOVL [degree] 4.0 f12 / f23 0.13 FOVL [degree] 8.0 f12 / f56 -2.11 fS [millimeters] 65.15 (R5+R6) / fL 0.38 FnoS 2.65 (R1-R3) / (R1+R3) 0.05 HFOVS [degree] 4.0 R5 / Rlast2 1.91 FOVS [degree] 8.0 CTmax / ATLmax 0.47 EPD (millimeters) 24.63 CTlast2 / CT1 0.20 ImgH [milliliters] 4.70 T12 / T23 0.05 fA1 [millimeters] 29.04 (T56+CT6) / (CT4+CT5) 0.48 fA2 [millimeters] -15.87 ATLmax / ImgH 2.17 fL / EPD 2.68 V6 / N6 10.91 MIN(fL / fi) -7.28 2×ImgH / EPD 0.38 MIN(fL / f5,fL / f6) -7.28 fL / (CRAL+HFOVL) [millimeters / degree] 4.83 fL / TL 1.42 ETL3 / CT3 1.59 fL / fA1 2.27 ETLlast / CTlast 0.32 fL / f2 1.36 10×T12 / ETL12 0.35 |fL / f3| 1.25 YL1R1 / YL8R2 3.34 fL / f4 3.39 (YLA1Rlast-YLA2R1) / ETLA12 0.50

[0341] The definitions described in Table 7D are the same as those in the first embodiment.

[0342] <Eighth Embodiment>

[0343] 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 the first shooting state and the second shooting 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 shooting 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 shooting state. The upper half of Figure 22 is a schematic diagram of the imaging optical system assembly in the first shooting state, while the lower half of Figure 22 is a schematic diagram of the imaging optical system assembly in the second shooting state. As shown in Figure 22, the imaging device 8 includes an imaging optical system assembly (unlabeled) and an electronic photosensitive element IS. The imaging optical system assembly, along the optical path from the object side to the image side, includes, in sequence, a first lens E1, a second lens E2, an aperture ST, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an aperture stop S1, an eighth lens E8, a filter element E10, and an imaging plane IMG. Furthermore, the camera optical system assembly is configured along the optical path from the object side to the image side as a first lens group A1, an aperture ST, and a second lens group A2. The first lens group A1 includes a first lens E1 and a second lens E2, and the second lens group A2 includes a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. The electronic image sensor IS is mounted on the imaging plane IMG. The camera optical system assembly comprises eight lenses (E1, E2, E3, E4, E5, E6, E7, and E8), and there are no other interposed lenses between the lenses.

[0344] In the camera optical system assembly of the eighth embodiment, the first to eighth lenses, counted from the object side, are respectively the first lens E1 to the eighth lens E8, and the first to eighth lenses, counted from the image side, correspond to the eighth lens E8 to the first lens E1, wherein the eighth lens E8 can also be referred to as the last lens.

[0345] The camera optical system assembly of the eighth embodiment performs a focusing process by moving at least one of its lenses. Through the focusing process, the camera optical system assembly has a first shooting state corresponding to an infinity object distance and a second shooting state corresponding to a finite object distance of 10,000.000 mm. The first shooting state is the state of the camera optical system assembly when the subject is at infinity (infinity object distance), and the second shooting state is the state of the camera optical system assembly when the subject is at a finite object distance (finite object distance). When the subject moves from infinity to a finite object distance, the camera optical system assembly performs a focusing process to change from the first shooting state to the second shooting state. Conversely, when the subject moves from a finite object distance to infinity, the camera optical system assembly also performs a focusing process to change from the second shooting state to the first shooting state. During the focusing process, the eighth lens E8 of the camera optical system assembly moves along the optical axis.

[0346] The first lens group A1 has positive refractive power, and the second lens group A2 has negative refractive power.

[0347] 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 concave near the optical axis. Both of its surfaces are spherical.

[0348] 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 spherical.

[0349] The third lens E3 has negative 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 spherical.

[0350] The fourth lens E4 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.

[0351] The fifth lens, E5, has negative refractive power and is made of glass. Its object-side surface is concave near the optical axis, and its image-side surface is also concave near the optical axis. Both surfaces are spherical. The object-side surface of the fifth lens, E5, is bonded to the image-side surface of the fourth lens, E4.

[0352] The sixth lens, E6, 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.

[0353] The seventh lens E7 has negative refractive power and is made of glass. 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 spherical.

[0354] The eighth lens, E8, 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.

[0355] The filter element E10 is made of glass and is located between the eighth lens E8 and the imaging surface IMG. It does not affect the focal length of the camera optical system group.

[0356] In the camera optical system group, the lens with the smallest effective radius among all lenses at the corresponding infinity object distance is the seventh lens, E7.

[0357] The maximum distance between all adjacent lenses in the camera optical system group on the optical axis is located between the sixth lens E6 and the seventh lens E7.

[0358] In the second lens group A2, the third lens E3 is a convex-concave lens. The fourth lens E4, a biconvex positive lens, and the fifth lens E5, a biconcave negative lens, combine to form an achromatic lens group with negative refractive power. The sixth lens E6 is an aspherical lens.

[0359] Please refer to Tables 8A to 8D below.

[0360] Table 8A, Eighth Embodiment surface radius of curvature thickness Material Refractive index Abbe number focal length 0 Subject flat D0 1 First lens 22.0835 (SPH) 2.677 Glass 1.569 63.1 94.82 2 35.7555 (SPH) 0.078 3 Second lens 17.8400 (SPH) 4.478 Glass 1.569 71.3 37.97 4 93.0089 (SPH) 0.675 5 aperture flat 0.957 6 Third lens 15.8849 (SPH) 1.878 Glass 1.911 35.2 -36.46 7 10.1398 (SPH) 0.190 8 Fourth lens 10.3685 (SPH) 5.353 Glass 1.497 81.6 17.01 9 Fifth lens -37.8898 (SPH) 1.521 Glass 1.904 31.3 -7.90 10 8.9596 (SPH) 0.078 11 Sixth lens 8.0218 (ASP) 2.514 plastic 1.661 20.4 19.43 12 18.6869 (ASP) 12.126 13 Seventh Lens -10.2940 (SPH) 0.987 Glass 1.847 23.8 -9.85 14 45.8229 (SPH) D1 15 Aperture flat -0.700 16 Eighth lens 15.7909 (ASP) 1.958 plastic 1.661 20.4 13.95 17 -21.1086 (ASP) D2 18 Filter element flat 0.510 Glass 1.517 64.2 - 19 flat 5.623 20 Imaging surface flat - The reference wavelength (d-line) is 587.6 nm. The effective radius of surface 15 (aperture S1) is 4.445 mm.

[0361] Table 8B. Parameters in the first and second shooting states First shooting state Second shooting state fL [millimeters] 65.73 fS [millimeters] 64.85 FnoL 2.78 FnoS 2.74 HFOVL [degree] 3.4 HFOVS [degree] 3.4 Object distance [millimeters] unlimited Object distance [millimeters] 10000.000 D0 [millimeters] unlimited D0 [millimeters] 10000.000 D1 [millimeters] 4.304 D1 [millimeters] 3.826 D2 [millimeters] 1.812 D2 [millimeters] 2.290

[0362] The definitions in Table 8B are the same as in the first embodiment, except that D1 is the distance on the optical axis between the image-side surface of the seventh lens E7 and the aperture stop S1. Furthermore, in addition to the first and second shooting states, the camera optical system assembly of this embodiment can also have other focusing states with different focal lengths to correspond to other focusing states with different object distances.

[0363] As can be seen from Tables 8A and 8B, the aperture stop S1 and the eighth lens E8 move along the optical axis during the focusing process.

[0364] Table 8C, Aspheric Coefficient surface 11 12 16 17 k = -5.53348E-01 -4.12789E+00 1.19255E-01 -9.92134E-02 A4 = 7.7774E-05 1.0000E-04 9.2119E-05 2.3742E-04 A6 = -3.6801E-07 -2.6836E-06 1.3691E-06 3.4884E-06 A8 = -8.5969E-09 6.4231E-08 4.8054E-07 2.6904E-07 A10 = 7.8772E-10 -1.7965E-09 -2.3768E-08 -7.2206E-09 A12 = -2.3492E-11 -7.5245E-12 -8.9867E-11 -9.3299E-10 A14 = -2.9541E-13 6.7061E-14 7.1135E-11 9.9401E-11 A16 = 1.5478E-15 -1.0307E-15 -1.5130E-12 -1.8222E-12

[0365] The equations for the aspherical surfaces in Table 8C are expressed in the form of the first embodiment.

[0366] Table 8D, Polynomial Data fL [million millimeters] 65.73 f4 / f2 0.45 FnoL 2.78 flast2 / f3 0.27 HFOVL [degree] 3.4 f12 / f23 0.14 FOVL [degree] 6.8 f12 / f56 -2.24 fS [millimeters] 64.85 (R5+R6) / fL 0.40 FnoS 2.74 (R1-R3) / (R1+R3) 0.11 HFOVS [degree] 3.4 R5 / Rlast2 1.01 FOVS [degree] 6.8 CTmax / ATLmax 0.44 EPD (millimeters) 23.64 CTlast2 / CT1 0.37 ImgH [milliliters] 3.96 T12 / T23 0.05 fA1 [millimeters] 27.86 (T56+CT6) / (CT4+CT5) 0.38 fA2 [millimeters] -46.19 ATLmax / ImgH 3.06 fL / EPD 2.78 V6 / N6 12.28 MIN(fL / fi) -8.32 2×ImgH / EPD 0.34 MIN(fL / f5,fL / f6) -8.32 fL / (CRAL+HFOVL) [millimeters / degree] 9.45 fL / TL 1.40 ETL3 / CT3 1.32 fL / fA1 2.36 ETLlast / CTlast 0.46 fL / f2 1.73 10×T12 / ETL12 0.37 |fL / f3| 1.80 YL1R1 / YL8R2 2.71 fL / f4 3.86 (YLA1Rlast-YLA2R1) / ETLA12 0.48

[0367] The definitions described in Table 8D are the same as those in the first embodiment.

[0368] <Ninth Embodiment>

[0369] Please refer to Figures 25 to 27. Figure 25 illustrates schematic diagrams of the imaging device according to the ninth embodiment of this disclosure in the first shooting state and the second shooting state, respectively. Figure 26, from left to right, shows the spherical aberration, astigmatism, and distortion curves of the imaging device of the ninth embodiment in the first shooting state, and 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 shooting state. The upper half of Figure 25 is a schematic diagram of the imaging optical system assembly in the first shooting state, while the lower half of Figure 25 is a schematic diagram of the imaging optical system assembly in the second shooting state. As shown in Figure 25, the imaging device 9 includes an imaging optical system assembly (unlabeled) and an electronic photosensitive element IS. The imaging optical system assembly, along the optical path from the object side to the image side, includes, in sequence, a first lens E1, a second lens E2, an aperture ST, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an aperture stop S1, a seventh lens E7, an eighth lens E8, a filter element E10, and an imaging plane IMG. Furthermore, the camera optical system assembly is configured along the optical path from the object side to the image side as a first lens group A1, an aperture ST, and a second lens group A2. The first lens group A1 includes a first lens E1 and a second lens E2, and the second lens group A2 includes a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. The electronic image sensor IS is mounted on the imaging plane IMG. The camera optical system assembly comprises eight lenses (E1, E2, E3, E4, E5, E6, E7, and E8), and there are no other interposed lenses between the lenses.

[0370] In the camera optical system assembly of the ninth embodiment, the first to eighth lenses, counted from the object side, are respectively the first lens E1 to the eighth lens E8, and the first to eighth lenses, counted from the image side, correspond to the eighth lens E8 to the first lens E1, wherein the eighth lens E8 can also be referred to as the last lens.

[0371] The camera optical system assembly of the ninth embodiment performs a focusing process by moving at least one of its lenses. The camera optical system assembly, through the focusing process, has a first shooting state corresponding to an infinity object distance and a second shooting state corresponding to a finite object distance of 10,000.000 mm. The first shooting state is the state of the camera optical system assembly when the subject is at infinity (infinity object distance), and the second shooting state is the state of the camera optical system assembly when the subject is at a finite object distance (finite object distance). When the subject moves from infinity to a finite object distance, the camera optical system assembly performs a focusing process to change from the first shooting state to the second shooting state. Conversely, when the subject moves from a finite object distance to infinity, the camera optical system assembly also performs a focusing process to change from the second shooting state to the first shooting state. During the focusing process, the eighth lens E8 of the camera optical system assembly moves along the optical axis.

[0372] The first lens group A1 has positive refractive power, and the second lens group A2 has negative refractive power.

[0373] 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 concave near the optical axis. Both of its surfaces are spherical.

[0374] 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 spherical.

[0375] The third lens E3 has negative 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 spherical.

[0376] 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.

[0377] The fifth lens, E5, has negative refractive power and is made of glass. 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 spherical.

[0378] The sixth lens, E6, 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.

[0379] The seventh lens E7 has negative refractive power and is made of glass. 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 spherical.

[0380] The eighth lens, E8, 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.

[0381] The filter element E10 is made of glass and is located between the eighth lens E8 and the imaging surface IMG. It does not affect the focal length of the camera optical system group.

[0382] In the camera optical system group, the lens with the smallest effective radius among all lenses at the corresponding infinity object distance is the seventh lens, E7.

[0383] The maximum distance between all adjacent lenses in the camera optical system group on the optical axis is located between the sixth lens E6 and the seventh lens E7.

[0384] In the second lens group A2, the third lens E3 is a convex-concave lens. The fourth lens E4, a biconvex positive lens, and the fifth lens E5, a biconcave negative lens, combine to form an achromatic lens group with negative refractive power. The sixth lens E6 is an aspherical lens.

[0385] Please refer to Tables 9A to 9D below.

[0386] Table 9A, Ninth Embodiment surface radius of curvature thickness Material Refractive index Abbe number focal length 0 Subject flat D0 1 First lens 28.7149 (SPH) 1.500 Glass 1.946 17.9 131.60 2 36.3765 (SPH) 0.037 3 Second lens 18.8745 (SPH) 3.930 Glass 1.511 60.5 40.08 4 222.9112 (SPH) 0.271 5 aperture flat 0.170 6 Third lens 23.7014 (SPH) 0.938 Glass 1.847 23.8 -43.40 7 14.1467 (SPH) 0.110 8 Fourth lens 13.6227 (ASP) 5.260 plastic 1.544 56.0 21.32 9 -67.4051 (ASP) 0.071 10 Fifth lens -67.4544 (SPH) 1.050 Glass 1.904 31.4 -26.96 11 38.4173 (SPH) 0.041 12 Sixth lens 16.6320 (ASP) 2.046 plastic 1.697 16.3 -301.88 13 14.6350 (ASP) 12.383 14 Aperture flat 0.700 15 Seventh Lens -9.9050 (SPH) 0.480 Glass 1.923 18.9 -11.82 16 -110.3588 (SPH) D1 17 Eighth lens 19.0625 (ASP) 1.620 plastic 1.705 14.0 21.56 18 -72.2821 (ASP) D2 19 Filter element flat 0.510 Glass 1.517 64.2 - 20 flat 6.305 twenty one Imaging surface flat - The reference wavelength (d-line) is 587.6 nm. The effective radius of surface 14 (aperture S1) is 3.536 mm.

[0387] Table 9B: Parameters in the first and second shooting states First shooting state Second shooting state fL [millimeters] 62.78 fS [millimeters] 62.20 FnoL 2.88 FnoS 2.85 HFOVL [degree] 3.6 HFOVS [degree] 3.6 Object distance [millimeters] unlimited Object distance [millimeters] 10000.000 D0 [millimeters] unlimited D0 [millimeters] 10000.000 D1 [millimeters] 5.305 D1 [millimeters] 4.834 D2 [millimeters] 4.995 D2 [millimeters] 5.466

[0388] The definitions described in Table 9B are the same as those in the first embodiment. Furthermore, in addition to the first and second shooting states, the camera optical system assembly of this embodiment may also have other focusing states with different focal lengths to correspond to focusing states with other different object distances.

[0389] As can be seen from Tables 9A and 9B, the eighth lens E8 moves along the optical axis during the focusing process.

[0390] Table 9C, Aspheric Coefficient surface 8 9 12 13 k = -4.67450E-02 5.63101E+00 -6.47633E+00 -8.45969E+00 A4 = 8.7925E-06 1.2158E-05 5.1271E-05 1.6167E-04 A6 = -3.5281E-07 1.5538E-07 1.0225E-06 -3.2502E-06 A8 = 1.1191E-08 -1.53​​29E-08 -1.3666E-07 -5.5884E-08 A10 = -1.6122E-10 2.9173E-10 3.3305E-09 2.1010E-09 A12 = 1.0059E-12 -1.7014E-12 -4.4052E-11 -2.7413E-11 A14 = - - 3.3409E-13 1.1367E-13 A16 = - [[ID=Q38]] - -1.4620E-15 - surface 17 18 k = " 7.51662E+00 -9.90000E+01 A4 = 1.9142E-04 3.9477E-04 A6 = 1.7241E-06 4.9517E-06 A8 = 7.3647E-07 6.3828E-07 A10 = -4.5925E-08 -7.4134E-09 A12 = 1.4249E-09 -2.1446E-09 A14 = 1.3937E-11 1.7869E-10 A16 = -8.3423E-13 -3.5111E-12

[0391] The equations for the aspherical curves in Table 9C are expressed in the form of the first embodiment.

[0392] Table 9D, Polynomial Data fL [millimeters] 62.78 f4 / f2 0.53 FnoL 2.88 flast2 / f3 0.27 HFOVL [degree] 3.6 f12 / f23 0.14 FOVL [degree] 7.2 f12 / f56 -1.33 fS [millimeters] 62.20 (R5+R6) / fL 0.60 FnoS 2.85 (R1-R3) / (R1+R3) 0.21 HFOVS [degree] 3.6 R5 / Rlast2 1.24 FOVS [degree] 7.2 CTmax / ATLmax 0.40 EPD (millimeters) 21.80 CTlast2 / CT1 0.32 ImgH [milliliters] 3.96 T12 / T23 0.08 fA1 [millimeters] 31.30 (T56+CT6) / (CT4+CT5) 0.33 fA2 [millimeters] -37.24 ATLmax / ImgH 3.30 fL / EPD 2.88 V6 / N6 9.61 MIN(fL / fi) -5.31 2×ImgH / EPD 0.36 MIN(fL / f5,fL / f6) -2.33 fL / (CRAL+HFOVL) [millimeters / degree] 7.26 fL / TL 1.32 ETL3 / CT3 2.09 fL / fA1 2.01 ETLlast / CTlast 0.59 fL / f2 1.57 10×T12 / ETL12 0.23 |fL / f3| 1.45 YL1R1 / YL8R2 2.49 fL / f4 2.95 (YLA1Rlast-YLA2R1) / ETLA12 0.37

[0393] The definitions described in Table 9D are the same as those in the first embodiment.

[0394] <Tenth Embodiment>

[0395] Please refer to Figures 28 to 30, where Figure 28 illustrates schematic diagrams of the imaging device according to the tenth embodiment of this disclosure in a first shooting state and a second shooting state, Figure 29 shows, from left to right, spherical aberration, astigmatism, and distortion curves of the imaging device of the tenth embodiment in the first shooting state, and Figure 30 shows, from left to right, spherical aberration, astigmatism, and distortion curves of the imaging device of the tenth embodiment in the second shooting state. The upper half of Figure 28 is a schematic diagram of the camera optical system assembly in the first shooting state, and the lower half of Figure 28 is a schematic diagram of the camera optical system assembly in the second shooting state. As shown in Figure 28, the imaging device 10 includes a camera optical system assembly (unspecified) and an electronic photosensitive element IS. The camera optical system assembly, arranged sequentially from the object side to the image side along the optical path, includes a first lens E1, a second lens E2, a third lens E3, an aperture ST, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an aperture stop S1, an eighth lens E8, a ninth lens E9, a filter element E10, and an imaging surface IMG. More specifically, the camera optical system assembly, arranged sequentially from the object side to the image side along the optical path, has a first lens group A1, an aperture ST, and a second lens group A2. The first lens group A1 includes the first lens E1, the second lens E2, and the third lens E3, and the second lens group A2 includes the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, and the ninth lens E9. The electronic image sensor IS is disposed on the imaging surface IMG. The camera optical system assembly comprises nine lenses (E1, E2, E3, E4, E5, E6, E7, E8, E9), and there are no other interposed lenses between the lenses.

[0396] In the camera optical system assembly of the tenth embodiment, the first to ninth lenses, counted from the object side, are respectively the first lens E1 to the ninth lens E9, and the first to ninth lenses, counted from the image side, correspond to the ninth lens E9 to the first lens E1, wherein the ninth lens E9 can also be referred to as the last lens.

[0397] The camera optical system assembly of the tenth embodiment performs a focusing process by moving at least one of its lenses. The camera optical system assembly, through the focusing process, has a first shooting state corresponding to an infinity object distance and a second shooting state corresponding to a finite object distance of 8000.000 mm. The first shooting state is the state of the camera optical system assembly when the subject is at infinity (infinity object distance), and the second shooting state is the state of the camera optical system assembly when the subject is at a finite object distance (finite object distance). When the subject moves from infinity to a finite object distance, the camera optical system assembly performs a focusing process to change from the first shooting state to the second shooting state. Conversely, when the subject moves from a finite object distance to infinity, the camera optical system assembly also performs a focusing process to change from the second shooting state to the first shooting state. During the focusing process, the fourth lens E4, the fifth lens E5, the sixth lens E6, and the seventh lens E7 of the camera optical system assembly move along the optical axis.

[0398] The first lens group A1 has positive refractive power, and the second lens group A2 has negative refractive power.

[0399] 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.

[0400] The second lens E2 has negative 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 spherical.

[0401] The third lens E3 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 spherical.

[0402] The fourth lens E4 has negative 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 spherical.

[0403] The fifth lens, E5, 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.

[0404] The sixth lens, E6, has negative refractive power and is made of glass. Its object-side surface is concave near the optical axis, and its image-side surface is also concave near the optical axis. Both surfaces are spherical. The object-side surface of the sixth lens, E6, is bonded to the image-side surface of the fifth lens, E5.

[0405] The seventh lens E7 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.

[0406] The eighth lens, E8, has negative 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.

[0407] The ninth lens, E9, 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.

[0408] The filter element E10 is made of glass and is located between the ninth lens E9 and the imaging surface IMG. It does not affect the focal length of the camera optical system group.

[0409] The lens with the smallest effective radius among all lenses in the camera optical system group at the corresponding infinity object distance is the eighth lens, E8.

[0410] The maximum distance between all adjacent lenses in the camera optical system group on the optical axis is located between the seventh lens E7 and the eighth lens E8 or between the eighth lens E8 and the ninth lens E9.

[0411] In the second lens group A2, the fourth lens E4 is a convex-concave lens. The fifth lens E5, a biconvex positive lens, and the sixth lens E6, a biconcave negative lens, combine to form an achromatic lens group with negative refractive power. The seventh lens E7 is an aspherical lens.

[0412] Please refer to Tables 10A to 10D below.

[0413] Table 10A, Tenth Embodiment surface radius of curvature thickness Material Refractive index Abbe number focal length 0 Subject flat D0 1 First lens 60.7093 (SPH) 2.530 Glass 1.652 58.4 66.55 2 -149.2537 (SPH) 0.050 3 Second lens 23.7119 (SPH) 0.897 Glass 1.923 18.9 -141.27 4 19.6987 (SPH) 0.038 5 Third lens 18.6065 (SPH) 3.742 Glass 1.729 54.7 39.51 6 48.0889 (SPH) 1.261 7 aperture flat D1 8 Fourth lens 31.4511 (SPH) 1.330 Glass 1.855 36.6 -48.72 9 17.5752 (SPH) 0.230 10 Fifth lens 13.1371 (SPH) 6.160 Glass 1.530 60.5 18.57 11 Sixth lens -32.9641 (SPH) 1.458 Glass 1.883 39.2 -10.47 12 13.1153 (SPH) 0.257 13 Seventh Lens 15.7397 (ASP) 2.750 plastic 1.587 28.3 27.78 14 419.0944 (ASP) D2 15 Aperture flat 0.000 16 Eighth lens 1356.9299 (ASP) 0.443 Glass 1.855 36.6 -12.03 17 10.2135 (ASP) 9.302 18 Ninth Lens -175.4386 (ASP) 1.818 plastic 1.656 21.3 21.53 19 -13.1236 (ASP) 4.190 20 Filter element flat 0.510 Glass 1.517 64.2 - twenty one flat 1.474 twenty two Imaging surface flat - The reference wavelength (d-line) is 587.6 nm. The effective radius of surface 15 (aperture S1) is 3.675 mm.

[0414] Table 10B: Parameters in the first and second shooting states First shooting state Second shooting state fL [millimeters] 70.52 fS [millimeters] 70.10 FnoL 2.82 FnoS 2.80 HFOVL [degree] 3.0 HFOVS [degree] 3.0 Object distance [millimeters] unlimited Object distance [millimeters] 8000.000 D0 [millimeters] unlimited D0 [millimeters] 8000.000 D1 [millimeters] 1.666 D1 [millimeters] 1.981 D2 [millimeters] 9.500 D2 [millimeters] 9.185

[0415] The definitions in Table 10B are identical to those in the first embodiment, except that D1 is the distance on the optical axis between the aperture ST and the object-side surface of the fourth lens E4, D2 is the distance on the optical axis between the image-side surface of the seventh lens E7 and the aperture stop S1, and the finite object distances corresponding to fS, FnoS, and HFOVS are 8000.000 mm. Furthermore, the camera optical system assembly of this embodiment can also have other focusing states with different focal lengths in addition to the first and second shooting states, to correspond to focusing states with other different object distances.

[0416] As can be seen from Tables 10A and 10B, the fourth lens E4, the fifth lens E5, the sixth lens E6, and the seventh lens E7 move along the optical axis during the focusing process.

[0417] Table 10C, Aspheric Coefficient surface 13 14 16 17 k = 5.73724E-01 9.90000E+01 9.90000E+01 1.72922E+00 A4 = -1.8379E-05 -5.5606E-05 -1.9139E-05 -1.0035E-05 A6 = -1.1257E-06 -1.3037E-06 6.1354E-06 5.7369E-06 A8 = 1.5472E-07 1.9892E-07 -8.3671E-08 -6.6136E-08 A10 = -8.2030E-09 -1.0841E-08 - - A12 = 2.8178E-10 3.8583E-10 - - A14 = -5.0273E-12 -7.2992E-12 - - A16 = 3.9095E-14 6.0623E-14 - - surface 18 19 k = 9.90000E+01 3.92747E+00 A4 = -4.2742E-04 -1.4920E-04 A6 = -4.1365E-05 -2.3930E-05 A8 = 5.7187E-06 3.3104E-06 A10 = -5.9884E-07 -3.0339E-07 A12 = 3.4785E-08 1.5844E-08 A14 = -1.0977E-09 -4.5205E-10 A16 = 1.4124E-11 5.3449E-12

[0418] The equations for the aspherical surfaces in Table 10C are represented as in the first embodiment.

[0419] Table 10D, Polynomial Data fL [millimeters] 70.52 f4 / f2 0.34 FnoL 2.82 flast2 / f3 -0.30 HFOVL [degree] 3.0 f12 / f23 2.09 FOVL [degree] 6.0 f12 / f56 -2.78 fS [millimeters] 70.10 (R5+R6) / fL 0.95 FnoS 2.80 (R1-R3) / (R1+R3) 0.44 HFOVS [degree] 3.0 R5 / Rlast2 -0.11 FOVS [degree] 6.0 CTmax / ATLmax 0.65 EPD (millimeters) 25.01 CTlast2 / CT1 0.18 ImgH [milliliters] 3.80 T12 / T23 1.32 fA1 [millimeters] 30.38 (T56+CT6) / (CT4+CT5) 0.19 fA2 [millimeters] -195.03 ATLmax / ImgH 2.50 fL / EPD 2.82 V6 / N6 20.82 MIN(fL / fi) -6.74 2×ImgH / EPD 0.30 MIN(fL / f5,fL / f6) -6.74 fL / (CRAL+HFOVL) [millimeters / degree] 13.64 fL / TL 1.42 ETL3 / CT3 0.31 fL / fA1 2.32 ETLlast / CTlast 0.57 fL / f2 -0.50 10×T12 / ETL12 0.13 |fL / f3| 1.78 YL1R1 / YL8R2 3.66 fL / f4 -1.45 (YLA1Rlast-YLA2R1) / ETLA12 0.39

[0420] The definitions described in Table 10D are the same as those in the first embodiment.

[0421] <Eleventh Embodiment>

[0422] Please refer to Figures 31 to 33, where Figure 31 illustrates schematic diagrams of the imaging device according to the eleventh embodiment of this disclosure in a first shooting state and a second shooting state, Figure 32 shows, from left to right, spherical aberration, astigmatism, and distortion curves of the imaging device of the eleventh embodiment in the first shooting state, and Figure 33 shows, from left to right, spherical aberration, astigmatism, and distortion curves of the imaging device of the eleventh embodiment in the second shooting state. The upper half of Figure 31 is a schematic diagram of the camera optical system assembly in the first shooting state, and the lower half of Figure 31 is a schematic diagram of the camera optical system assembly in the second shooting state. As shown in Figure 31, the imaging device 11 includes a camera optical system assembly (unspecified) and an electronic photosensitive element IS. The camera optical system assembly, arranged sequentially from the object side to the image side along the optical path, includes a first lens E1, a second lens E2, an aperture ST, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an aperture stop S1, a seventh lens E7, an eighth lens E8, a filter element E10, and an imaging surface IMG. More specifically, the camera optical system assembly, arranged sequentially from the object side to the image side along the optical path, has a first lens group A1, an aperture ST, and a second lens group A2. The first lens group A1 includes the first lens E1 and the second lens E2, and the second lens group A2 includes the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, and the eighth lens E8. The electronic image sensor IS is disposed on the imaging surface IMG. The camera optical system assembly includes eight lenses (E1, E2, E3, E4, E5, E6, E7, E8), and there are no other interposed lenses between the lenses.

[0423] In the camera optical system assembly of the eleventh embodiment, the first to eighth lenses, counted from the object side, are respectively the first lens E1 to the eighth lens E8, and the first to eighth lenses, counted from the image side, correspond to the eighth lens E8 to the first lens E1, wherein the eighth lens E8 can also be referred to as the last lens.

[0424] The camera optical system assembly of the eleventh embodiment performs a focusing process by moving at least one of its lenses. The camera optical system assembly, through the focusing process, has a first shooting state corresponding to an infinity object distance and a second shooting state corresponding to a finite object distance of 10,000.000 mm. The first shooting state is the state of the camera optical system assembly when the subject is at infinity (infinity object distance), and the second shooting state is the state of the camera optical system assembly when the subject is at a finite object distance (finite object distance). When the subject moves from infinity to a finite object distance, the camera optical system assembly performs a focusing process to change from the first shooting state to the second shooting state. Conversely, when the subject moves from a finite object distance to infinity, the camera optical system assembly also performs a focusing process to change from the second shooting state to the first shooting state. During the focusing process, the eighth lens E8 of the camera optical system assembly moves along the optical axis.

[0425] The first lens group A1 has positive refractive power, and the second lens group A2 has negative refractive power.

[0426] 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 concave near the optical axis. Both of its surfaces are spherical.

[0427] 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 spherical.

[0428] The third lens E3 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.

[0429] 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.

[0430] The fifth lens, E5, has negative refractive power and is made of glass. 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 spherical.

[0431] The sixth lens, E6, 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.

[0432] The seventh lens E7 has negative refractive power and is made of glass. 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 spherical.

[0433] The eighth lens, E8, 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.

[0434] The filter element E10 is made of glass and is located between the eighth lens E8 and the imaging surface IMG. It does not affect the focal length of the camera optical system group.

[0435] In the camera optical system group, the lens with the smallest effective radius among all lenses at the corresponding infinity object distance is the seventh lens, E7.

[0436] The maximum distance between all adjacent lenses in the camera optical system group on the optical axis is located between the sixth lens E6 and the seventh lens E7.

[0437] In the second lens group A2, the third lens E3 is a convex-concave lens. The fourth lens E4, a biconvex positive lens, and the fifth lens E5, a biconcave negative lens, combine to form an achromatic lens group with negative refractive power. The sixth lens E6 is an aspherical lens.

[0438] Please refer to Tables 11A to 11D below.

[0439] Table 11A, Eleventh Embodiment surface radius of curvature thickness Material Refractive index Abbe number focal length 0 Subject flat D0 1 First lens 20.4020 (SPH) 1.223 Glass 1.946 17.9 713.05 2 20.4253 (SPH) 0.038 3 Second lens 19.5184 (SPH) 3.930 Glass 1.593 67.3 33.40 4 1185.7157 (SPH) 0.160 5 aperture flat 0.160 6 Third lens 17.2925 (ASP) 1.700 plastic 1.544 56.0 617.84 7 17.5989 (ASP) 0.110 8 Fourth lens 13.0175 (ASP) 4.852 plastic 1.515 56.4 21.39 9 -62.7845 (ASP) 0.071 10 Fifth lens -71.8152 (SPH) 1.088 Glass 1.904 31.4 -12.10 11 12.9901 (SPH) 0.607 12 Sixth lens 18.7541 (ASP) 0.772 Glass 1.656 21.3 -630.24 13 17.6478 (ASP) 9.479 14 Aperture flat 0.900 15 Seventh Lens -8.5735 (SPH) 0.420 Glass 1.923 18.9 -21.36 16 -15.5318 (SPH) D1 17 Eighth lens 22.4995 (ASP) 1.073 plastic 1.705 14.0 32.55 18 1143.0526 (ASP) D2 19 Filter element flat 0.510 Glass 1.517 64.2 - 20 flat 10.427 twenty one Imaging surface flat - The reference wavelength (d-line) is 587.6 nm. The effective radius of surface 14 (aperture S1) is 3.682 mm.

[0440] Table 11B: Parameters in the first and second shooting states First shooting state Second shooting state fL [millimeters] 62.38 fS [millimeters] 61.84 FnoL 2.90 FnoS 2.87 HFOVL [degree] 3.5 HFOVS [degree] 3.5 Object distance [millimeters] unlimited Object distance [millimeters] 10000.000 D0 [millimeters] unlimited D0 [millimeters] 10000.000 D1 [millimeters] 6.526 D1 [millimeters] 5.995 D2 [millimeters] 3.774 D2 [millimeters] 4.305

[0441] The definitions described in Table 11B are the same as those in the first embodiment. Furthermore, in addition to the first and second shooting states, the camera optical system assembly of this embodiment may also have other focusing states with different focal lengths to correspond to focusing states with other different object distances.

[0442] As can be seen from Tables 11A and 11B, the eighth lens E8 moves along the optical axis during the focusing process.

[0443] Table 11C, Aspheric Coefficient surface 6 7 8 9 k = 1.36260E-01 1.07273E-01 -1.92273E-01 -1.13776E+01 A4 = -1.6472E-05 -2.0914E-05 3.1077E-05 4.5446E-05 A6 = 1.9539E-06 2.5962E-06 -2.0812E-06 -2.7209E-06 A8 = -6.2095E-08 -9.6466E-08 7.4242E-08 1.5166E-07 A10 = 8.0148E-10 1.4062E-09 -1.1768E-09 -4.1096E-09 A12 = -3.7215E-12 -7.0755E-12 6.8436E-12 4.9585E-11 A14 = - - - -2.2280E-13 surface 12 13 17 18 k = -1.90657E+00 -1.03665E+01 8.00970E+00 9.90000E+01 A4 = -3.3299E-04 -2.0184E-04 2.3603E-04 3.8800E-04 A6 = 5.5489E-05 5.1657E-05 -6.6055E-06 -9.2727E-06 A8 = -4.8661E-06 -5.0927E-06 2.4898E-06 3.4099E-06 A10 = 2.3373E-07 2.6117E-07 -2.6480E-07 -3.7197E-07 A12 = -5.9773E-09 -7.0836E-09 1.6295E-08 2.3493E-08 A14 = 7.7407E-11 9.6924E-11 -5.0010E-10 -7.4493E-10 A16 = -4.0757E-13 -5.3568E-13 6.2101E-12 9.6041E-12

[0444] The equations for the aspherical surfaces in Table 11C are represented as in the first embodiment.

[0445] Table 11D, Polynomial Data fL [millimeters] 62.38 f4 / f2 0.64 FnoL 2.90 flast2 / f3 -0.03 HFOVL [degree] 3.5 f12 / f23 1.06 FOVL [degree] 7.0 f12 / f56 -2.81 fS [millimeters] 61.84 (R5+R6) / fL 0.56 FnoS 2.87 (R1-R3) / (R1+R3) 0.02 HFOVS [degree] 3.5 R5 / Rlast2 0.77 FOVS [degree] 7.0 CTmax / ATLmax 0.47 EPD (millimeters) 21.51 CTlast2 / CT1 0.34 ImgH [milliliters] 3.85 T12 / T23 0.12 fA1 [millimeters] 32.82 (T56+CT6) / (CT4+CT5) 0.23 fA2 [millimeters] -42.39 ATLmax / ImgH 2.70 fL / EPD 2.90 V6 / N6 12.86 MIN(fL / fi) -5.16 2×ImgH / EPD 0.36 MIN(fL / f5,fL / f6) -5.16 fL / (CRAL+HFOVL) [millimeters / degree] 7.52 fL / TL 1.30 ETL3 / CT3 0.77 fL / fA1 1.90 ETLlast / CTlast 0.60 fL / f2 1.87 10×T12 / ETL12 2.03 |fL / f3| 0.10 YL1R1 / YL8R2 2.46 fL / f4 2.92 (YLA1Rlast-YLA2R1) / ETLA12 0.37

[0446] The definitions described in Table 11D are the same as those in the first embodiment.

[0447] <Twelfth Embodiment>

[0448] Please refer to Figure 34, which is a perspective view of an image capturing device according to the twelfth 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 camera optical system assembly described in the first embodiment, a lens barrel (not otherwise labeled) for supporting the camera optical system assembly, and a support device (Holder Member, not otherwise labeled). The imaging lens 101 can also be replaced with the camera optical system assembly 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.

[0449] The driving device 102 may have internal focusing or auto-focusing functions. Its driving method can utilize, but is not limited to, driving systems such as stepping motors, piezo motors, screws, voice coil motors (VCMs), spring-type, ball-type, microelectromechanical systems (MEMS), piezoelectric systems, and shape memory alloys. The driving device 102 allows the imaging lens 101 to achieve a better imaging position, enabling clear images of the subject at different object distances. Furthermore, movable elements in the image capturing device 100 (such as movable optical elements or electronic photosensitive elements in the lens group, but not limited to these) can also be driven by the driving device 102, thus allowing the movable elements to move horizontally, tilted, or perpendicular to the optical axis. However, this disclosure is not limited to the driving methods disclosed. In addition, the imaging device 100 is equipped with an electronic image sensor 103 (such as CMOS or CCD) with high sensitivity and low noise, which is placed on the imaging surface of the camera optical system assembly, so as to truly present the good imaging quality of the camera optical system assembly.

[0450] The image stabilization module 104 can be, for example, an accelerometer, a gyroscope, or a Hall effect sensor. The driving device 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 compensates for the blurry image caused by shaking during shooting, or it can use image compensation technology in the imaging software to provide electronic image stabilization (EIS), further improving the image quality of shooting in dynamic and low-light scenes. In addition, some components in the image capturing device 100 can also be driven by the driving device 102 to compensate for image tilt in real time, thus achieving the same optical image stabilization function.

[0451] <Thirteenth Embodiment>

[0452] Please refer to Figures 35 and 36, wherein Figure 35 shows a perspective view of one side of an electronic device according to the thirteenth embodiment of the present disclosure, and Figure 36 shows a perspective view of the other side of the electronic device of Figure 35.

[0453] In this embodiment, the electronic device 200 is a smartphone. The electronic device 200 includes the image capturing device 100, image capturing device 100a, image capturing device 100b, image capturing device 100c, and display module 201 as described in the twelfth embodiment. As shown in FIG35, image capturing devices 100, 100a, and 100b are all disposed on the same side of the electronic device 200. As shown in FIG36, image capturing device 100c and display module 201 are both disposed on the other side of the electronic device 200. Image capturing device 100c can serve as a front-facing camera to provide a selfie function, but this disclosure is not limited thereto. Furthermore, image capturing devices 100a, 100b, and 100c can all include the camera optical system assembly disclosed herein and can all have a structural configuration similar to that of image capturing device 100. In detail, each of the image capturing devices 100a, 100b, and 100c may include an imaging lens, a driving device, an electronic photosensitive element, and an image stabilization module, and may also include a reflective element as a component for deflecting the optical path. The imaging lens of each of the image capturing devices 100a, 100b, and 100c may include, for example, an optical lens group (as disclosed in this camera optical system assembly), a lens barrel for supporting the optical lens group, and a support device.

[0454] Image capturing device 100 is a telephoto image capturing device, image capturing device 100a is a wide-angle image capturing device, image capturing device 100b is an ultra-wide-angle image capturing device, and image capturing device 100c is a wide-angle 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. Furthermore, as shown in Figure 36, the opening of image capturing device 100c can be non-circular, and the lens barrel or lens inside image capturing device 100c can have a chamfered edge at its outer diameter to accommodate the non-circular opening. This allows for a further reduction in the single-axis length of image capturing device 100c, facilitating a reduction in lens volume, increasing the area ratio of display module 201 relative to electronic device 200, and reducing the thickness of electronic device 200, further achieving module miniaturization. The electronic device 200 described above includes multiple image capturing devices 100, 100a, 100b, and 100c, but the number and configuration of the image capturing devices are not intended to limit this disclosure.

[0455] <Fourteenth Embodiment>

[0456] Please refer to Figures 37 to 39, wherein Figure 37 shows a perspective view of one side of an electronic device according to the fourteenth embodiment of the present disclosure, Figure 38 shows a perspective view of the other side of the electronic device of Figure 37, and Figure 39 shows a system block diagram of the electronic device of Figure 37.

[0457] In this embodiment, the electronic device 300 is a smartphone. The electronic device 300 includes, according to the twelfth embodiment, image capturing devices 100, 100d, 100e, 100f, 100g, and 100h, a flash module 301, a focus assist module 302, an image signal processor 303, a display module 304, and an image software processor 305. Image capturing devices 100, 100d, and 100e are all located on the same side of the electronic device 300. The focus assist module 302 may employ a laser ranging or a Time-of-Flight (ToF) module, but this disclosure is not limited to these. Image capturing devices 100f, 100g, 100h, and display module 304 are all located on the other side of electronic device 300, and display module 304 can serve as a user interface, allowing image capturing devices 100f, 100g, and 100h to function as front-facing cameras for selfies, but this disclosure is not limited thereto. Furthermore, image capturing devices 100d, 100e, 100f, 100g, and 100h can all include the camera optical system assembly disclosed herein and can all have a structural configuration similar to that of image capturing device 100. In detail, each of the imaging devices 100d, 100e, 100f, 100g, and 100h may include an imaging lens, a driving device, an electronic photosensitive element, and an image stabilization module, and may also include a reflective element as a component for deflecting the optical path. The imaging lens of each of the imaging devices 100d, 100e, 100f, 100g, and 100h may include, for example, an optical lens group (as in the camera optical system assembly disclosed herein), a lens barrel for supporting the optical lens group, and a support device.

[0458] Image capturing device 100 is a telescopic image capturing device, image capturing device 100d is a wide-angle image capturing device, image capturing device 100e is an ultra-wide-angle 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 time-of-flight ranging image capturing device. In this embodiment, image capturing devices 100, 100d, and 100e have different viewing angles, allowing the electronic device 300 to provide different magnifications to achieve optical zoom shooting effects. Furthermore, image capturing device 100 is a telescopic image capturing device with a light path deflection element configuration, such as a reflective element, so that the total length of image capturing device 100 is not limited by the thickness of the electronic device 300. The light path deflection element configuration of image capturing device 100, such as a reflective element, can have a structure similar to that in Figures 44 to 48, as described above with reference to the corresponding Figures 44 to 48, and will not be repeated here. In addition, the imaging device 100h can acquire depth information of the image. The above-mentioned electronic device 300 is an example that includes multiple imaging devices 100, 100d, 100e, 100f, 100g, and 100h, but the number and configuration of the imaging devices are not intended to limit this disclosure.

[0459] When the user photographs the subject 306, the electronic device 300 uses the image capturing device 100, image capturing device 100d, or image capturing device 100e to focus the light and activates the flash module 301 for supplemental lighting. It also uses the subject distance information provided by the focus assist module 302 for fast focusing, and the image signal processor 303 performs image optimization processing to further improve the image quality produced by the camera optical system. The focus assist module 302 can use an infrared or laser focus assist system to achieve fast focusing. In addition, the electronic device 300 can also use the image capturing device 100f, image capturing device 100g, or image capturing device 100h for shooting. The display module 304 can use a touch screen and, in conjunction with the diverse functions of the image software processor 305, can perform image shooting and image processing (or can use a physical shooting button). The image processed by the image software processor 305 can be displayed on the display module 304.

[0460] <Fifteenth Embodiment>

[0461] Please refer to Figure 40, which is a perspective view of one side of an electronic device according to the fifteenth embodiment of this disclosure.

[0462] In this embodiment, the electronic device 400 is a smartphone. The electronic device 400 includes, according to the twelfth 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 camera optical system group 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.

[0463] Image capturing device 100 is a telephoto image capturing device, image capturing device 100i is a telephoto image capturing device, 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 telephoto image capturing device, image capturing device 100q is a telephoto 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 an optical zoom shooting effect. Furthermore, the image capturing devices 100 and 100i are telescopic image capturing devices configured with optical path deflection elements, such as reflective elements. The optical path deflection element configuration of the image capturing devices 100 and 100i can, for example, have a structure similar to that shown in Figures 44 to 48, as described above with reference to the corresponding Figures 44 to 48, and will not be repeated here. Additionally, the image capturing device 100r can acquire depth information of the image. 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.

[0464] <Sixteenth Embodiment>

[0465] Please refer to Figure 41, which is a schematic diagram of an electronic device according to the sixteenth embodiment of this disclosure.

[0466] In this embodiment, the electronic device 500 is a lightweight unmanned aerial vehicle, such as a drone. The electronic device 500 includes an image-capturing device 501. The image-capturing device 501 includes the camera optical system assembly described in the first embodiment. The image-capturing device 501 can be a telescopic image-capturing device. Similar to the image-capturing device 100, the image-capturing device 501 may further include a lens barrel, a support device, or a combination thereof. The electronic device 500 utilizes the image-capturing device 501 to perform functions such as taking pictures. Preferably, the electronic device may further include a control unit, a display unit, a storage unit, a temporary storage unit (RAM), or a combination thereof.

[0467] The image capturing device disclosed herein is not limited to applications in smartphones, mobile vehicles, or unmanned aerial vehicles. 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 handheld telescopes, 3D image capture, digital cameras, mobile devices, digital tablets, smart TVs, network monitoring equipment, dashcams, reversing camera cameras, multi-lens systems, recognition systems, motion-sensing game consoles, and wearable devices. 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.

[0468] 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.

[0469] 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 100, 100a, 100b, 100c, 100d, 100e, 100f, 100g, 100h, 100i, 100j, 100k, 100m, 100n, 100p, 100q, 100r, 501: imaging device 101: Imaging Lens 102: Drive unit 103: Electronic photosensitive element 104: Image Stabilization Module 200, 300, 400, 500: Electronic devices 201, 304: Display module 301, 401: Flash module 302: Focusing Assist Module 303: Image Signal Processor 305: Image Software Processor 306: Subject LG: Lens Group FT: Filter element LF, LF1, LF2: Reflective elements LP1, LP2: Penetration surface RF1, RF2: Reflecting surfaces OA: Optical Axis OA1: First optical axis OA2: Second optical axis OA3: Third optical axis ST: Aperture S1: Aperture E1: First lens E2: Second lens E3: Third Lens E4: Fourth Lens E5: Fifth Lens E6: Sixth Lens E7: Seventh Lens E8: Eighth Lens E9: Ninth Lens E10: Filter element IMG: Imaging Surface IS: Electronic photosensitive element A1: First lens group A2: Second lens group D0, D1, D2: Distance ATLmax: The maximum distance between all adjacent lenses on the optical axis in a camera optical system at an infinity object distance. CRAL: The angle of incidence of the principal ray at the maximum imaging height position for the camera optical system at infinity object distance. CRL: Chief Ray CT1: Thickness of the first lens on the optical axis CT3: Thickness of the third 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 CT6: Thickness of the sixth lens on the optical axis CTlast: The thickness of the final lens along the optical axis CTlast2: The thickness of the second lens on the optical axis, measured from the image side, within the camera optical system assembly. CTmax: The maximum thickness of a single lens along the optical axis among all lenses in the camera optics system group. EPD: Entrance pupil diameter of the camera optical system assembly ETL12: 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 in the camera optical system assembly at an infinity object distance. ETL3: The distance parallel to the optical axis between the maximum effective radius of the object-side surface of the third lens and the maximum effective radius of the image-side surface of the third lens at infinity object distance in the camera optical system assembly. ETLA12: The distance parallel to the optical axis between the maximum effective radius of the lens surface closest to the image side of the first lens group and the maximum effective radius of the lens surface closest to the object side of the second lens group when the camera optical system is at infinity. ETLlast: The distance parallel to the optical axis between the maximum effective radius of the object-side surface of the last lens and the maximum effective radius of the image-side surface of the last lens when the camera optical system is at an infinity object distance. fL: The total focal length of the camera optical system at an infinity object distance. fS: The total focal length of the camera optical system at a given object distance. f1: Focal length of the first lens f2: Focal length of the second lens f3: Focal length of the third lens f3: Focal length of the third lens f4: Focal length of the fourth lens f5: Focal length of the fifth lens f6: The focal length of the sixth lens (sixth lens) in the camera optical system assembly, counting from the object side. f7: Focal length of the seventh lens f8: Focal length of the eighth lens fi: The focal length of the i-th lens in the camera optical system assembly, measured from the object side. flast2: The focal length of the second lens in the camera optical system assembly, measured from the image side. f12: Combined focal length of the first and second lenses f23: Combined focal length of the second and third lenses f56: The combined focal length of the fifth lens and the sixth lens (sixth lens) in the camera optical system assembly. fA1: Focal length of the first lens group fA2: Focal length of the second lens group FnoL: Aperture value of the camera optical system at infinity object distance. FnoS: Aperture value of the camera optical system at a finite object distance. FOVL: The maximum angle of view of the camera optical system at an infinity object distance. FOVS: Maximum angle of view of the camera optical system at a finite object distance. HFOVL: Half of the maximum angle of view of the camera optics system at infinity. HFOVS: Half of the maximum angle of view of the camera optics system at a finite object distance. ImgH: Maximum imaging height of the camera optics system assembly MIN(fL / f5, fL / f6): The minimum value of fL / f5 and fL / f6 MIN(fL / fi): The minimum value of fL / fi N6: Refractive index of the sixth 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 R5: Radius of curvature of the object-side surface of the third lens R6: Radius of curvature of the image-side surface of the third lens Rlast2: The radius of curvature of the object-side surface of the first lens in the imaging optical system assembly, counting from the image side. T12: The distance between the first lens and the second lens on the optical axis T23: The distance between the second and third lenses on the optical axis T56: The distance between the fifth and sixth lenses on the optical axis TL: Distance along the optical axis from the object-side surface of the first lens to the imaging plane. V6: Abbe number of the sixth lens YL1R1: Maximum effective radius of the object-side surface of the first lens in the camera optical system assembly at an infinity object distance. YL8R2: Maximum effective radius of the image-side surface of the eighth lens in the camera optical system assembly at infinity object distance. YLA1Rlast: The maximum effective radius of the lens surface closest to the image side of the first lens group in the camera optical system assembly at an infinity object distance. YLA2R1: The maximum effective radius of the lens surface closest to the object side in the second lens group of the camera optical system at infinity object distance. YLmin: The minimum effective radius of the camera optical system assembly when it is in the first shooting state.

Claims

1. A camera optical system assembly comprising a plurality of lenses, the total number of which is eight to nine, wherein the lenses are sequentially arranged along an object side to an image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, and each lens has an object-side surface facing the object side and an image-side surface facing the image side; wherein, The first lens is the lens closest to the object side among all the lenses in the camera optical system assembly, and there are no other interposed lenses between the first lens and the eighth lens; wherein, the first lens has positive refractive power, the object-side surface of the second lens is convex near the optical axis, the object-side surface of the third lens is convex near the optical axis, the image-side surface of the third lens is concave near the optical axis, and the object-side surface of the fourth lens is convex near the optical axis; wherein, the camera optical system assembly further includes an aperture, and the aperture is located between the first lens and the fourth lens; The total focal length of the camera optical system at infinity is fL, the focal length of the i-th lens (counting from the object side) is fi, the minimum value of fL / fi is MIN(fL / fi), the focal length of the second lens is f2, the radius of curvature of the object-side surface of the third lens is R5, the radius of curvature of the object-side surface of the first lens (counting from the image side) is Rlast2, and half of the maximum field of view (HFOVL) at infinity satisfies the following conditions: -13.80 < MIN(fL / fi) < -3.80, where i is a positive integer and 1 ≤ i ≤ the total number of lenses in the camera optical system; -1.00 < R5 / Rlast2 < 4.50; -1.50 < fL / f2 < 4.50; and 1.0 degree < HFOVL < 7.5 degrees.

2. The imaging optical system assembly as described in claim 1, comprising, sequentially from the object side to the image side along the optical path, a first lens group, the aperture, and a second lens group; wherein, There are no other interposed lenses between the first lens group and the second lens group; wherein the first lens group includes the first lens, and the second lens group includes the last lens closest to the image side; wherein the first lens group has positive refractive power, and the second lens group has negative refractive power; wherein at least one of the fifth lens and the sixth lens in the imaging optical system group is a negative lens; wherein the total focal length of the imaging optical system group at an infinity object distance is fL, the radius of curvature of the object-side surface of the third lens is R5, the radius of curvature of the image-side surface of the third lens is R6, the maximum distance between all adjacent lenses on the optical axis at an infinity object distance is ATLmax, and the maximum imaging height of the imaging optical system group is ImgH, which satisfies the following conditions: 0 < (R5+R6) / fL < 3.50; and 1.00 < ATLmax / ImgH < 6.

00.

3. The camera optical system group as described in claim 2, wherein all lenses of the camera optical system group comprise at least two glass lenses and at least one plastic lens, and the maximum distance between all adjacent lenses of the camera optical system group on the optical axis is located in the second lens group.

4. The imaging optical system assembly as described in claim 2, wherein at least two adjacent lenses in the second lens assembly are bonded together; wherein, The total focal length of the camera optical system group at the corresponding infinity object distance is fL, the entrance pupil diameter of the camera optical system group is EPD, the combined focal length of the first lens and the second lens is f12, and the combined focal length of the second lens and the third lens is f23, which satisfies the following conditions: 1.40 < fL / EPD < 3.50; and -0.25 < f12 / f23 < 2.

40.

5. The camera optical system assembly as described 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 object-side surface of the second lens is R3, the total focal length of the camera optical system assembly at an object distance of infinity is fL, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, and the minimum value of fL / f5 and fL / f6 is MIN(fL / f5, fL / f6), which satisfies the following conditions: -0.50 < (R1-R3) / (R1+R3) < 0.70; and -11.20 < MIN(fL / f5, fL / f6) < -2.

00.

6. The camera optical system assembly as claimed in claim 1, wherein the thickness of the first lens on the optical axis is CT1, the thickness of the second lens on the optical axis, counting from the image side, is CTlast2, the radius of curvature of the object-side surface of the third lens is R5, the radius of curvature of the image-side surface of the third lens is R6, and the total focal length of the camera optical system assembly at an infinity object distance is fL, which satisfies the following conditions: 0.03 < CTlast2 / CT1 < 0.80; and 0.20 < (R5+R6) / fL < 1.

20.

7. The camera optical system assembly as described in claim 1, wherein the total focal length of the camera optical system assembly at an infinity object distance is fL, and the distance from the object-side surface of the first lens to an imaging plane on the optical axis is TL, which satisfies the following condition: 1.15 < fL / TL < 2.

00.

8. The camera optical system assembly as claimed in claim 1, wherein all lenses of the camera optical system assembly comprise at least one spherical lens and at least one aspherical lens, and the camera optical system assembly focuses by moving at least one of its lenses; wherein, The total focal length of the camera optical system group at the corresponding infinity object distance is fL, and the focal length of the i-th lens in the camera optical system group from the object side is fi. The minimum value of fL / fi is MIN(fL / fi), which satisfies the following condition: -11.70 < MIN(fL / fi) < -5.00, where i is a positive integer, and 1 ≤ i ≤ the total number of lenses in the camera optical system group.

9. The camera optical system assembly as described in claim 1, wherein the total focal length of the camera optical system assembly at an infinity object distance is fL, the focal length of the third lens is f3, the maximum distance between all adjacent lenses on the optical axis at an infinity object distance is ATLmax, and the maximum imaging height of the camera optical system assembly is ImgH, which satisfies the following conditions: 0 < |fL / f3| < 2.20; and 1.15 < ATLmax / ImgH < 4.

50.

10. The imaging optical system assembly as claimed in claim 1, wherein the seventh lens has negative refractive power; wherein, The third lens has a focal length of f3, the second lens in the imaging optical system assembly has a focal length of flast2 from the image side, the distance between the first lens and the second lens on the optical axis is T12, and the distance between the second lens and the third lens on the optical axis is T23, which satisfy the following conditions: -6.50 < flast2 / f3 < 0.70; and 0.01 < T12 / T23 < 2.

00.

11. The camera optical system assembly as claimed in claim 1, wherein the total focal length of the camera optical system assembly at an infinity object distance is fL, and the maximum imaging height of the camera optical system assembly is ImgH, which satisfies the following conditions: 50.00 mm < fL < 80.00 mm; and 3.00 mm < ImgH < 5.50 mm.

12. The camera optical system assembly as claimed in claim 1, wherein the combined focal length of the first lens and the second lens is f12, the combined focal length of the fifth lens and the sixth lens in the camera optical system assembly is f56, the total focal length of the camera optical system assembly at an infinity object distance is fL, the principal ray incident angle at the maximum imaging height position at an infinity object distance is CRAL, and half of the maximum viewing angle at an infinity object distance is HFOVL, which satisfies the following conditions: -4.30 < f12 / f56 < 0.30; and 3.00 [mm / degree] < fL / (CRAL+HFOVL) < 15.00 [mm / degree].

13. The camera optical system assembly as described in claim 2, wherein the second lens assembly has a total of six lenses; wherein, When the object distance is infinity, the maximum effective radius of the lens surface of the first lens group closest to the image side is YLA1Rlast. When the object distance is infinity, the maximum effective radius of the lens surface of the second lens group closest to the object side is YLA2R1. The distance parallel to the optical axis between the positions of the maximum effective radius of the lens surface of the first lens group closest to the image side and the positions of the maximum effective radius of the lens surface of the second lens group closest to the object side when the object distance is infinity is ETLA12, which satisfies the following condition: 0.27 < (YLA1Rlast - YLA2R1) / ETLA12 < 0.

75.

14. The imaging optical system assembly as described in claim 1, wherein the lens with the smallest effective radius among all lenses in the imaging optical system assembly at an infinity object distance is either the second lens or the third lens in the imaging optical system assembly counting from the image side; wherein, The maximum thickness of a single lens on the optical axis of the camera optical system group is CTmax, and the maximum distance between all adjacent lenses on the optical axis of the camera optical system group at the corresponding infinity object distance is ATLmax, which satisfies the following condition: 0.25 < CTmax / ATLmax < 1.

00.

15. An image capturing device comprising: a camera optical system assembly as described in claim 1; and an electronic photosensitive element disposed on an imaging surface of the camera optical system assembly.

16. The imaging optical system assembly as described in claim 1, comprising, sequentially from the object side to the image side along the optical path, a first lens group, the aperture, and a second lens group; wherein, There are no other interposed lenses between the first lens group and the second lens group; wherein the first lens group includes the first lens, and the second lens group includes the last lens closest to the image side; wherein the first lens group has positive refractive power, and the second lens group has negative refractive power; wherein the total focal length of the imaging optical system group at an infinity object distance is fL, the focal length of the first lens group is fA1, the maximum single lens thickness on the optical axis of all lenses in the imaging optical system group is CTmax, and the maximum spacing distance on the optical axis of all adjacent lenses in the imaging optical system group at an infinity object distance is ATLmax, which satisfy the following conditions: 1.20 < fL / fA1 < 3.00; and 0.20 < CTmax / ATLmax < 1.

50.

17. The camera optical system assembly as described in claim 1, wherein, The total focal length of the camera optical system group at the corresponding infinity object distance is fL, and the focal length of the i-th lens in the camera optical system group from the object side is fi. The minimum value of fL / fi is MIN(fL / fi), which satisfies the following condition: -12.50 < MIN(fL / fi) < -4.30, where i is a positive integer and 1 ≤ i ≤ the total number of lenses in the camera optical system group.

18. The camera optical system assembly as claimed in claim 1, wherein the total focal length of the camera optical system assembly at an object distance of infinity is fL, and the distance on the optical axis from the object-side surface of the first lens to an imaging plane is TL, which satisfies the following condition: 1.20 < fL / TL < 1.

80.

19. The camera optical system assembly as claimed in claim 16, wherein the total focal length of the camera optical system assembly at an infinity object distance is fL, the focal length of the first lens assembly is fA1, the focal length of the second lens is f2, and the focal length of the fourth lens is f4, which satisfy the following conditions: 1.35 < fL / fA1 < 2.65; and -0.20 < f4 / f2 < 0.

85.

20. The camera optical system assembly as claimed in claim 1, wherein the combined focal length of the first lens and the second lens is f12, and the combined focal length of the second lens and the third lens is f23, which satisfies the following condition: -0.35 < f12 / f23 < 3.

00.

21. The camera optical system assembly as claimed in claim 1, wherein all lenses of the camera optical system assembly comprise at least two glass lenses and at least two plastic lenses; wherein, The total focal length of the camera optical system group at the corresponding infinity object distance is fL, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, and the minimum value of fL / f5 and fL / f6 is MIN(fL / f5,fL / f6), which satisfies the following condition: -13.50 < MIN(fL / f5,fL / f6) < -1.

00.

22. The camera optical system assembly as claimed in claim 1, wherein the radius of curvature of the object-side surface of the third lens is R5, the radius of curvature of the image-side surface of the third lens is R6, the total focal length of the camera optical system assembly at an object distance of infinity is fL, the combined focal length of the first lens and the second lens is f12, and the combined focal length of the sixth lens in the camera optical system assembly is f56, which satisfies the following conditions: 0.05 < (R5+R6) / fL < 3.00; and -3.30 < f12 / f56 < 0.

23. The camera optical system assembly as claimed in claim 1, wherein the radius of curvature of the object-side surface of the third lens is R5, and the radius of curvature of the object-side surface of the first lens in the camera optical system assembly, counting from the image side, is Rlast2, which satisfies the following condition: -1.50 < R5 / Rlast2 < 5.

00.

24. The camera optical system assembly as claimed in claim 1, wherein half of the maximum field of view of the camera optical system assembly at an infinity object distance is HFOVL, the total focal length of the camera optical system assembly at an infinity object distance is fL, and the focal length of the third lens is f3, which satisfies the following conditions: 1.5 degrees < HFOVL < 6.0 degrees; and 0.01 < |fL / f3| < 2.

10.

25. The camera optical system assembly as claimed in claim 16, wherein the second lens assembly comprises, in sequence along the optical path from the object side to the image side, a convex-concave lens, an achromatic lens assembly, and an aspherical lens, the achromatic lens assembly having negative refractive power, and the achromatic lens assembly being composed of, in sequence along the optical path from the object side to the image side, a biconvex positive lens and a biconcave negative lens.

26. The camera optical system assembly as described in claim 16, wherein the first lens group has a total of two lenses, the camera optical system assembly performs a focusing process to focus by moving at least one lens in the second lens group, the camera optical system assembly has at least two shooting states through the focusing process, and the object distance corresponding to one of the at least two shooting states is 15000 mm or less; wherein, The entrance pupil diameter of the camera optical system is EPD, which meets the following conditions: 15.00 mm < EPD < 32.00 mm.

27. The camera optical system assembly as claimed in claim 1, wherein the distance parallel to the optical axis between the position of the maximum effective radius of the object-side surface of the third lens and the position of the maximum effective radius of the image-side surface of the third lens at an infinity object distance is ETL3, the distance parallel to the optical axis between the position of the maximum effective radius of the object-side surface of the last lens and the position of the maximum effective radius of the image-side surface of the last lens at an infinity object distance is ETLlast, the thickness of the third lens on the optical axis is CT3, and the thickness of the last lens on the optical axis is CTlast, which satisfy the following conditions: 0.15 < ETL3 / CT3 < 3.00; and 0.15 < ETLlast / CTlast < 2.

00.

28. The camera optical system assembly as claimed in claim 1, wherein the distance between the first lens and the second lens on the optical axis is T12, and the distance parallel to the optical axis between the position of the maximum effective radius of the image-side surface of the first lens and the position of the maximum effective radius of the object-side surface of the second lens at an infinity object distance is ETL12, which satisfies the following condition: 0.05 < 10×T12 / ETL12 < 3.

50.

29. A camera optical system assembly as described in claim 16, wherein the total focal length of the camera optical system assembly at an infinity object distance is fL, the focal length of the i-th lens in the camera optical system assembly from the object side is fi, the minimum value of fL / fi is MIN(fL / fi), the focal length of the second lens is f2, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, the minimum value of fL / f5 and fL / f6 is MIN(fL / f5, fL / f6), the radius of curvature of the object-side surface of the third lens is R5, and the curvature of the image-side surface of the third lens is... The radius of curvature of the object-side surface of the first lens in this imaging optical system group, counting from the image side, is Rlast2. The maximum distance between all adjacent lenses on the optical axis at infinity is ATLmax. The maximum imaging height of this imaging optical system group is ImgH. The focal length of the first lens group is fA1. The maximum thickness of a single lens on the optical axis among all lenses in this imaging optical system group is CTmax. Half of the maximum angle of view of this imaging optical system group at infinity is HFOVL, which satisfies the following conditions: -11.51 ≤ MIN(fL / fi) ≤ -5.16, where i is a positive integer and 1 ≤ i ≤ the total number of lenses in the camera optical system group; -11.51 ≤ MIN(fL / f5,fL / f6) ≤ -2.33; 0.32 ≤ (R5+R6) / fL ≤ 0.95; 1.30 ≤ ATLmax / ImgH ≤ 3.30; 1.49 ≤ fL / fA1 ≤ 2.48; 0.38 ≤ CTmax / ATLmax ≤ 0.86; -0.29 ≤ R5 / Rlast2 ≤ 1.91; -0.50 ≤ fL / f2 ≤ 1.87; and 3.0 degrees ≤ HFOVL ≤ 4.9 degrees.

30. The camera optical system assembly as described in claim 1, wherein the total number of lenses is eight; wherein, The maximum imaging height of the camera optical system is ImgH, the entrance pupil diameter is EPD, the maximum effective radius of the object-side surface of the first lens at infinity is YL1R1, and the maximum effective radius of the image-side surface of the eighth lens at infinity is YL8R2, which satisfy the following conditions: 0.10 < 2×ImgH / EPD < 0.70; and 2.00 < YL1R1 / YL8R2 < 4.

00.

31. The camera optical system assembly as described in claim 30, wherein the image-side surface of the fifth lens is concave near the optical axis; wherein, The radius of curvature of the object-side surface of the third lens is R5, and the radius of curvature of the object-side surface of the first lens in the imaging optical system group, counting from the image side, is Rlast2, which satisfies the following condition: -0.60 < R5 / Rlast2 < 2.

30.

32. The camera optical system assembly as claimed in claim 30, wherein the Abbe number of the sixth lens is V6, the refractive index of the sixth lens is N6, the total focal length of the camera optical system assembly at an object distance of infinity is fL, and the focal length of the fourth lens is f4, which satisfies the following conditions: 5.00 < V6 / N6 < 14.80; and 2.50 < fL / f4 < 5.

20.

33. The camera optical system assembly as claimed in claim 30, wherein the second lens has positive refractive power, the fourth lens has positive refractive power, the fifth lens has negative refractive power, the seventh lens has negative refractive power, and the eighth lens has positive refractive power.

34. The camera optical system assembly as described in claim 1, wherein the total number of lenses is nine; wherein, The distance between the first lens and the second lens on the optical axis is T12, and the distance between the second lens and the third lens on the optical axis is T23, which satisfies the following condition: 0 < T12 / T23 < 4.

00.

35. The camera optical system assembly as described in claim 34, wherein the maximum distance between all adjacent lenses on the optical axis at an infinity object distance is ATLmax, the maximum imaging height of the camera optical system assembly is ImgH, the total focal length of the camera optical system assembly at an infinity object distance is fL, and the focal length of the second lens is f2, which satisfies the following conditions: 1.20 < ATLmax / ImgH < 3.50; and -0.80 < fL / f2 < 2.

20.

36. The camera optical system assembly as described in claim 34, wherein the distance between the fifth lens and the sixth lens on the optical axis is T56, the thickness of the fourth lens on the optical axis is CT4, the thickness of the fifth lens on the optical axis is CT5, and the thickness of the sixth lens on the optical axis is CT6, which satisfies the following condition: 0.05 < (T56+CT6) / (CT4+CT5) < 0.75.

Images