Imaging optical system, imaging device, and electronic device

Abstract

An image capturing optical system includes seven lenses. The seven lenses are sequentially arranged along an optical path from 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, and a seventh lens. The seven lenses respectively have an object side surface facing an object side direction and an image side surface facing an image side direction. The third lens has a negative refractive power. The fifth lens has a concave object side surface at a vicinity of an optical axis. The sixth lens has a positive refractive power. The seventh lens has a negative refractive power. The seventh lens has a convex object side surface at a vicinity of an optical axis. The seventh lens has a concave image side surface at a vicinity of an optical axis, and the image side surface of the seventh lens has at least one inflection point. When certain conditions are satisfied, the image capturing optical system can simultaneously satisfy the requirements of miniaturization and high imaging quality. The present disclosure also discloses an image capturing device having the image capturing optical system and an electronic device having the image capturing device.

Description

Technical Field

[0001] This disclosure relates to an imaging optical system, an imaging device, and an electronic device, particularly an imaging optical system and imaging device suitable for electronic devices. Background Technology

[0002] With advancements in semiconductor technology, the performance of electronic image sensors has improved, and pixels can be made smaller. 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 finding increasingly wider applications, leading to more diverse requirements for these lenses. Since existing optical lenses often struggle to achieve a balance between image quality, sensitivity, aperture size, size, and viewing angle, this invention provides an optical lens with high image quality to meet these demands. Summary of the Invention

[0004] This disclosure provides an imaging optical system, an imaging device, and an electronic device. The imaging optical system comprises seven lenses arranged sequentially along the optical path from the object side to the image side. Under certain conditions, the imaging optical system provided by this disclosure can simultaneously meet the requirements of miniaturization and high imaging quality.

[0005] This disclosure provides an imaging optical system comprising seven lenses. The seven lenses, arranged sequentially from the object side to the image side along the optical path, are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. Each of the seven lenses has an object-side surface facing the object side and an image-side surface facing the image side. Preferably, the third lens has negative refractive power. Preferably, the object-side surface of the fifth lens is concave near the optical axis. Preferably, the sixth lens has positive refractive power. Preferably, the seventh lens has negative refractive power. Preferably, the object-side surface of the seventh lens is convex near the optical axis. Preferably, the image-side surface of the seventh lens is concave near the optical axis. Preferably, the image-side surface of the seventh lens has at least one inflection point. The distance from the object-side surface of the first lens to the imaging plane along the optical axis is TL; 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 distance between the first and second lenses along the optical axis is T12; the distance between the second and third lenses along the optical axis is T23; the distance between the third and fourth lenses along the optical axis is T34; the distance between the fourth and fifth lenses along the optical axis is T45; the distance between the fifth and sixth lenses along the optical axis is T56; and the distance between the sixth and seventh lenses along the optical axis is T67. Preferably, the following conditions are satisfied:

[0006] -2.50 <TL / R1<1.00;

[0007] -2.50 < TL / R3 < 1.70; and

[0008] 0.00 < (T12 + T23 + T56 + T67) / (T34 + T45) < 0.70.

[0009] The present disclosure further provides an imaging optical system including seven lenses. The seven lenses are, in order from the object side to the image side along the optical path, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The seven lenses respectively have an object-side surface facing the object side and an image-side surface facing the image side. Preferably, the image-side surface of the second lens is convex near the optical axis. Preferably, the third lens has a negative refractive power. Preferably, the fifth lens has a negative refractive power. Preferably, the object-side surface of the fifth lens is concave near the optical axis. Preferably, the image-side surface of the fifth lens is convex near the optical axis. Preferably, the seventh lens has a negative refractive power. Preferably, the image-side surface of the seventh lens has at least one inflection point. The distance from the object-side surface of the first lens to the imaging surface on the optical axis is TL, 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 focal length of the sixth lens is f6, the focal length of the seventh lens is f7, the distance between the fourth lens and the fifth lens on the optical axis is T45, and the distance between the sixth lens and the seventh lens on the optical axis is T67, which preferably satisfies the following conditions:

[0010] -2.20 < TL / R1 < 1.00;

[0011] -2.50 < TL / R3 < 2.00;

[0012] 0.00 < |f6 / f7| < 1.00; and

[0013] 0.00 < T67 / T45 < 0.80.

[0014] This disclosure also provides an imaging optical system comprising seven lenses. The seven lenses, arranged sequentially from the object side to the image side along the optical path, are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. Each of the seven lenses has an object-side surface facing the object side and an image-side surface facing the image side. Preferably, the object-side surface of the first lens is concave near the optical axis. Preferably, the object-side surface of the second lens is concave near the optical axis. Preferably, the third lens has negative refractive power. Preferably, the object-side surface of the fifth lens is concave near the optical axis. Preferably, the image-side surface of the fifth lens is convex near the optical axis. Preferably, the sixth lens has positive refractive power. Preferably, the image-side surface of the seventh lens has at least one inflection point. The distance from the object-side surface of the first lens to the imaging plane along the optical axis is TL, 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, preferably satisfying the following conditions:

[0015] TL / R1 < 0.00; and

[0016] TL / R3 < 0.00.

[0017] This disclosure provides an imaging device comprising the aforementioned imaging optical system and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on the imaging surface of the imaging optical system.

[0018] This disclosure provides an electronic device that includes the aforementioned image capturing device.

[0019] When TL / R1 meets the above conditions, the ratio of the total length of the imaging optical system to the radius of curvature of the object-side surface of the first lens can be adjusted, which helps to adjust the viewing angle.

[0020] When TL / R3 meets the above conditions, the ratio of the total length of the imaging optical system to the radius of curvature of the object-side surface of the second lens can be adjusted, which helps to adjust the surface shape and refractive power of the second lens to improve the central imaging quality.

[0021] When (T12+T23+T56+T67) / (T34+T45) satisfies the above conditions, it helps to balance the lens distribution.

[0022] When |f6 / f7| meets the above conditions, it helps to balance the refractive force configuration at the image side.

[0023] When T67 / T45 meets the above conditions, it helps to compress the volume of the imaging optical system at the image side.

[0024] The foregoing description of the contents of this disclosure and the following description of the embodiments are used to demonstrate and explain the spirit and principles of this disclosure, and to provide a further explanation of the claims of this disclosure. Attached Figure Description

[0025] Figure 1 A schematic diagram of an image-capturing device according to a first embodiment of this disclosure is shown.

[0026] Figure 2 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the first embodiment.

[0027] Figure 3 A schematic diagram of an image-capturing device according to a second embodiment of the present disclosure is shown.

[0028] Figure 4 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the second embodiment.

[0029] Figure 5 A schematic diagram of an imaging device according to a third embodiment of this disclosure is shown.

[0030] Figure 6 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the third embodiment.

[0031] Figure 7 A schematic diagram of an imaging device according to the fourth embodiment of this disclosure is shown.

[0032] Figure 8 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the fourth embodiment.

[0033] Figure 9 A schematic diagram of an imaging device according to the fifth embodiment of this disclosure is shown.

[0034] Figure 10 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the fifth embodiment.

[0035] Figure 11 A schematic diagram of an imaging device according to the sixth embodiment of this disclosure is shown.

[0036] Figure 12 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the sixth embodiment.

[0037] Figure 13 A schematic diagram of an imaging device according to the seventh embodiment of this disclosure is shown.

[0038] Figure 14 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the seventh embodiment.

[0039] Figure 15 A schematic diagram of an imaging device according to the eighth embodiment of this disclosure is shown.

[0040] Figure 16 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the eighth embodiment.

[0041] Figure 17 A schematic diagram of an imaging device according to the ninth embodiment of this disclosure is shown.

[0042] Figure 18 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the ninth embodiment.

[0043] Figure 19 A schematic diagram of an imaging device according to the tenth embodiment of this disclosure is shown.

[0044] Figure 20 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the tenth embodiment.

[0045] Figure 21 A schematic diagram of an imaging device according to the eleventh embodiment of this disclosure is shown.

[0046] Figure 22 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the eleventh embodiment.

[0047] Figure 23 A schematic diagram of an imaging device according to the twelfth embodiment of this disclosure is shown.

[0048] Figure 24 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the twelfth embodiment.

[0049] Figure 25 A perspective view of an imaging device according to the thirteenth embodiment of this disclosure is shown.

[0050] Figure 26 A perspective view of one side of an electronic device according to the fourteenth embodiment of this disclosure is shown.

[0051] Figure 27 Draw Figure 26 A three-dimensional diagram of the other side of the electronic device.

[0052] Figure 28 A perspective view of one side of an electronic device according to the fifteenth embodiment of this disclosure is shown.

[0053] Figure 29 Draw Figure 28 A three-dimensional diagram of the other side of the electronic device.

[0054] Figure 30 Draw Figure 28 System block diagram of an electronic device.

[0055] Figure 31 A perspective view of one side of an electronic device according to the sixteenth embodiment of this disclosure is shown.

[0056] Figure 32 A perspective view of one side of an electronic device according to the seventeenth embodiment of this disclosure is shown.

[0057] Figure 33 A perspective view of one side of an electronic device according to the eighteenth embodiment of this disclosure is shown.

[0058] Figure 34 A schematic diagram illustrating the inflection point and the critical point on the lens surface according to the first embodiment of this disclosure.

[0059] Figure 35 A schematic diagram illustrating parameters Y2R1 and Y7R2 according to the first embodiment of this disclosure is shown.

[0060] Figure 36 A schematic diagram illustrating an arrangement of an optical path reversing element in an imaging optical system according to the present invention is shown.

[0061] Figure 37 A schematic diagram illustrating another configuration of an optical path reversing element in an imaging optical system according to the present disclosure is shown.

[0062] Figure 38 A schematic diagram illustrating one configuration of the two optical path reversing elements in an imaging optical system according to the present invention is shown.

[0063] [Symbol Explanation]

[0064] 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 100, 100a, 100b, 100c, 100d, 100e, 100f, 1 00g, 100h, 100i, 100j, 100k, 100m, 100n, 100p, 100q, 100r, 100s, 602: imaging device

[0065] 101: Imaging Lens

[0066] 102: Drive unit

[0067] 103: Electronic photosensitive element

[0068] 104: Image Stabilization Module

[0069] 200, 300, 400, 500, 600: Electronic devices

[0070] 201, 304: Display module

[0071] 301, 401, 501: Flash module

[0072] 601: Screen

[0073] 302: Focusing Assist Module

[0074] 303: Image Signal Processor

[0075] 305: Image Software Processor

[0076] 306: Subject

[0077] C: Critical point

[0078] P: Inversion point

[0079] OA1: First optical axis

[0080] OA2: Second optical axis

[0081] OA3: Third optical axis

[0082] LF: Optical path switching element

[0083] LF1: First optical path switching element

[0084] LF2: Second optical path switching element

[0085] LG: Lens Group

[0086] ST: Aperture

[0087] S1: Aperture

[0088] E1: First lens

[0089] E2: Second lens

[0090] E3: Third Lens

[0091] E4: Fourth Lens

[0092] E5: Fifth Lens

[0093] E6: Sixth Lens

[0094] E7: Seventh Lens

[0095] E8: Filter element

[0096] IMG: Imaging Surface

[0097] IS: Electronic photosensitive element

[0098] Y2R1: Maximum effective radius of the object-side surface of the second lens

[0099] Y7R2: Maximum effective radius of the image-side surface of the seventh lens Detailed Implementation

[0100] The imaging optical system comprises seven lenses, which are arranged sequentially from the object side to the image side along the optical path as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. Each of the seven lenses has an object-side surface facing the object side and an image-side surface facing the image side.

[0101] The object-side surface of the first lens can be concave near the optical axis. This helps to adjust the refractive power and viewing angle of the first lens. The image-side surface of the first lens can be convex near the optical axis. This helps to increase the viewing angle of the imaging optical system and adjust the refractive power of the first lens.

[0102] The object-side surface of the second lens can be concave near the optical axis. This can be matched with the surface shape of the first lens, helping to improve the light-gathering quality. The image-side surface of the second lens can be convex near the optical axis. This allows control over the light path and helps to avoid total internal reflection caused by excessive deflection angles.

[0103] The third lens can have negative refractive power. This helps to balance the aberrations produced by the first and second lenses. The image-side surface of the third lens can be concave near the optical axis. This allows for adjustment of the optical path and helps to increase the imaging area.

[0104] The fourth lens can have positive refractive power. This helps to reduce volume and improve the light-gathering ability of the imaging optics. The image-side surface of the fourth lens can be convex near the optical axis. This helps to control the size of the peripheral field beam and reduce peripheral vignetting distortion of the image.

[0105] The fifth lens can have negative refractive power. This helps reduce spherical aberration in the imaging optics. The object-side surface of the fifth lens can be concave near the optical axis. This helps enhance the negative refractive power of the fifth lens and improve chromatic aberration in the imaging optics. The image-side surface of the fifth lens can be convex near the optical axis. This helps correct aberrations in the imaging optics and maintain good image quality.

[0106] The sixth lens can have positive refractive power. This allows the imaging optics system to have sufficient light-gathering capability at the image side. The image-side surface of the sixth lens can be convex near the optical axis. This helps to shorten the back focal length.

[0107] The seventh lens can have negative refractive power. This balances the refractive power of the imaging optics at the image side, improving the light-gathering quality of rays from each field of view at the imaging plane and reducing aberrations. The object-side surface of the seventh lens can be convex near the optical axis. This allows adjustment of the lens's shape, helping to correct off-axis image curvature. The image-side surface of the seventh lens can be concave near the optical axis. This allows adjustment of the lens's shape, helping to adjust the back focal length.

[0108] According to the imaging optical system disclosed in the present disclosure, the image-side surface of the seventh lens may have at least one inflection point. Thereby, it helps to correct the image curvature and distortion of the imaging optical system, while shortening the total length of the imaging optical system. Please refer to Figure 34 , which is a schematic diagram showing the inflection point P of the image-side surface of the seventh lens E7 in the first embodiment according to the present disclosure. Figure 34 It shows the inflection point P on the image-side surface of the seventh lens E7 in the first embodiment of the present disclosure, together with the object-side surface, image-side surface of the first lens E1, object-side surface of the second lens E2, object-side surface of the third lens E3, image-side surface of the third lens E3, object-side surface of the fifth lens E5, image-side surface of the fifth lens E5, object-side surface of the sixth lens E6, image-side surface of the sixth lens E6, and the inflection point P on the object-side surface of the seventh lens E7 as an exemplary illustration. However, in each embodiment of the present disclosure, each lens surface may have one or more inflection points.

[0109] According to the imaging optical system disclosed in the present disclosure, the image-side surface of the seventh lens may have at least one critical point at an off-axis position. Thereby, it helps to control the peripheral image aberration, while facilitating the reduction of the volume. Please refer to Figure 34 , which is a schematic diagram showing the critical point C at an off-axis position of the image-side surface of the seventh lens E7 in the first embodiment according to the present disclosure. Figure 34 It shows the critical point C at an off-axis position on the image-side surface of the seventh lens E7 in the first embodiment of the present disclosure, together with the object-side surface of the third lens E3, object-side surface of the fifth lens E5, image-side surface of the fifth lens E5, object-side surface of the sixth lens E6, image-side surface of the sixth lens E6, and the critical point C at an off-axis position on the object-side surface of the seventh lens E7 as an exemplary illustration. However, in each embodiment of the present disclosure, each lens surface may have one or more critical points at an off-axis position.

[0110] The distance from the object-side surface of the first lens to the imaging surface on the optical axis is TL, and the radius of curvature of the object-side surface of the first lens is R1, which may satisfy the following conditions: -2.50 < TL / R1 < 1.00. Thereby, the ratio of the total length of the imaging optical system to the radius of curvature of the object-side surface of the first lens can be adjusted, which helps to adjust the viewing angle size. Among them, the following conditions may also be satisfied: -2.20 < TL / R1 < 1.00. Among them, the following conditions may also be satisfied: -2.10 < TL / R1 < 0.80. Among them, the following conditions may also be satisfied: -2.00 < TL / R1 < 0.70. Among them, the following conditions may also be satisfied: -1.95 ≤ TL / R1 ≤ 0.61. Among them, the following conditions may also be satisfied: TL / R1 < 0.00.

[0111] The distance from the object side surface of the first lens to the imaging surface on the optical axis is TL, and the radius of curvature of the object side surface of the second lens is R3, which can satisfy the following condition: -2.50 < TL / R3 < 2.00. Thereby, the ratio of the total length of the imaging optical system to the radius of curvature of the object side surface of the second lens can be adjusted, which helps to adjust the surface shape and refractive power of the second lens to improve the central imaging quality. Among them, the following condition can also be satisfied: -2.50 < TL / R3 < 1.70. Among them, the following condition can also be satisfied: -2.30 < TL / R3 < 1.90. Among them, the following condition can also be satisfied: -2.20 < TL / R3 < 1.70. Among them, the following condition can also be satisfied: -2.14 ≤ TL / R3 ≤ 1.58. Among them, the following condition can also be satisfied: TL / R3 < 0.00.

[0112] The distance between the first lens and the second lens on the optical axis is T12, the distance between the second lens and the third lens on the optical axis is T23, the distance between the third lens and the fourth lens on the optical axis is T34, the distance between the fourth lens and the fifth lens on the optical axis is T45, the distance between the fifth lens and the sixth lens on the optical axis is T56, and the distance between the sixth lens and the seventh lens on the optical axis is T67, which can satisfy the following condition: 0.00 < (T12 + T23 + T56 + T67) / (T34 + T45) < 0.70. Thereby, it helps to balance the lens distribution. Among them, the following condition can also be satisfied: 0.00 < (T12 + T23 + T56 + T67) / (T34 + T45) < 0.60. Among them, the following condition can also be satisfied: 0.10 < (T12 + T23 + T56 + T67) / (T34 + T45) < 0.55. Among them, the following condition can also be satisfied: 0.13 ≤ (T12 + T23 + T56 + T67) / (T34 + T45) ≤ 0.49.

[0113] The focal length of the sixth lens is f6, and the focal length of the seventh lens is f7, which can satisfy the following condition: 0.00 < |f6 / f7| < 1.00. Thereby, it helps to balance the refractive power configuration at the image side end. Among them, the following condition can also be satisfied: 0.20 < |f6 / f7| < 0.90. Among them, the following condition can also be satisfied: 0.36 ≤ |f6 / f7| ≤ 0.83.

[0114] The distance between the fourth lens and the fifth lens on the optical axis is T45, and the distance between the sixth lens and the seventh lens on the optical axis is T67, which can satisfy the following conditions: 0.00 < T67 / T45 < 0.80. Thereby, it helps to compress the volume at the image side end of the imaging optical system. Among them, the following conditions can also be satisfied: 0.00 < T67 / T45 < 0.60. Among them, the following conditions can also be satisfied: 0.00 < T67 / T45 < 0.50. Among them, the following conditions can also be satisfied: 0.06 ≤ T67 / T45 ≤ 0.42.

[0115] The total thickness of all lenses in the imaging optical system on the optical axis is ΣCT, and the total distance between all adjacent lenses in the imaging optical system on the optical axis is ΣAT, which can satisfy the following conditions: 3.00 < ΣCT / ΣAT < 6.50. Thereby, it helps to increase the compactness of the lens arrangement. Among them, the following conditions can also be satisfied: 3.50 < ΣCT / ΣAT < 6.00.

[0116] The focal length of the imaging optical system is f, the radius of curvature of the object side surface of the fifth lens is R9, and the radius of curvature of the image side surface of the fifth lens is R10, which can satisfy the following conditions: 4.00 < |f / R9| + |f / R10| < 8.00. Thereby, it helps to control the refractive power of the fifth lens and balance the off-axis aberration. Among them, the following conditions can also be satisfied: 4.50 < |f / R9| + |f / R10| < 6.50.

[0117] The radius of curvature of the image side surface of the fifth lens is R10, and the radius of curvature of the object side surface of the sixth lens is R11, which can satisfy the following conditions: -0.70 < R10 / R11 < 0.30. Thereby, the traveling direction of light can be adjusted, which helps to increase the imaging height. Among them, the following conditions can also be satisfied: -0.55 < R10 / R11 < 0.25.

[0118] According to the imaging optical system disclosed in this disclosure, it may further include an aperture. The distance between the aperture and the imaging surface on the optical axis is SL, and the focal length of the imaging optical system is f, which can satisfy the following conditions: 1.40 < SL / f < 2.00. Thereby, the ratio of the distance between the aperture and the imaging surface to the focal length of the imaging optical system can be adjusted, which helps to adjust the aperture position. Among them, the following conditions can also be satisfied: 1.50 < SL / f < 1.90.

[0119] The focal length of the fifth lens is f5, and the focal length of the sixth lens is f6, which can satisfy the following conditions: 0.70 < |f5 / f6| < 1.80. Thereby, the refractive powers of the fifth lens and the sixth lens can be balanced, which helps to balance the convergence or divergence of light and improve the light collection quality of the entire field of view. Among them, the following conditions can also be satisfied: 0.80 < |f5 / f6| < 1.60.

[0120] The distance from the object side surface of the first lens to the imaging surface on the optical axis is TL, and the focal length of the imaging optical system is f, which can satisfy the following conditions: 1.60 < TL / f < 2.10. Thereby, it helps to compress the total length of the imaging optical system and increase the viewing angle size. Among them, the following conditions can also be satisfied: 1.65 < TL / f < 2.05.

[0121] Half of the maximum viewing angle in the imaging optical system is HFOV, which can satisfy the following conditions: 0.70 < tan(HFOV) < 1.40. Thereby, the imaging optical system can have an appropriate viewing angle to meet market demands. Among them, the following conditions can also be satisfied: 0.80 < tan(HFOV) < 1.30.

[0122] The focal length of the fourth lens is f4, and the focal length of the seventh lens is f7, which can satisfy the following conditions: 0.40 < |f4 / f7| < 1.40. Thereby, it can balance the refractive power configuration of the imaging optical system and help reduce aberration. Among them, the following conditions can also be satisfied: 0.45 < |f4 / f7| < 1.20.

[0123] The radius of curvature of the object side surface of the second lens is R3, and the radius of curvature of the image side surface of the second lens is R4, which can satisfy the following conditions: -0.50 < (R3 - R4) / (R3 + R4). Thereby, it helps to adjust the surface shape and refractive power of the second lens. Among them, the following conditions can also be satisfied: -0.40 < (R3 - R4) / (R3 + R4) < 10.00. Among them, the following conditions can also be satisfied: -0.20 < (R3 - R4) / (R3 + R4) < 8.00.

[0124] The thickness of the second lens on the optical axis is CT2, and the thickness of the sixth lens on the optical axis is CT6, which can satisfy the following conditions: 0.30 < CT6 / CT2 < 1.25. Thereby, it can balance the lens thickness configuration at the object side end and the image side end of the imaging optical system to improve space utilization. Among them, the following conditions can also be satisfied: 0.40 < CT6 / CT2 < 1.15.

[0125] The Abbe number of the fourth lens is V4, which can satisfy the following conditions: 35.0 < V4 < 75.0. Thereby, it helps to balance the convergence ability of the imaging optical system for light of different wavelengths to correct chromatic aberration. Among them, the following conditions can also be satisfied: 40.0 < V4 < 60.0.

[0126] The distance from the object side surface of the first lens to the imaging surface on the optical axis is TL, and the maximum imaging height of the imaging optical system (which can be half of the total length of the diagonal of the effective sensing area of the electronic photosensitive element) is ImgH, and the following conditions can be satisfied: 1.50 < TL / ImgH < 2.10. Thereby, it helps to achieve a balance between compressing the total length of the imaging optical system and increasing the imaging surface. Among them, the following conditions can also be satisfied: 1.60 < TL / ImgH < 2.00.

[0127] The focal length of the imaging optical system is f, the focal length of the first lens is f1, and the focal length of the second lens is f2, and the following conditions can be satisfied: 0.50 < f / f1 + f / f2 < 3.00. Thereby, it helps to provide the imaging optical system with sufficient ability to converge light. Among them, the following conditions can also be satisfied: 0.70 < f / f1 + f / f2 < 2.00.

[0128] The radius of curvature of the image side surface of the third lens is R6, and the radius of curvature of the object side surface of the fourth lens is R7, and the following conditions can be satisfied: -0.40 < R6 / R7 < 0.55. Thereby, it helps to control the refraction angle of light in the imaging optical system. Among them, the following conditions can also be satisfied: -0.30 < R6 / R7 < 0.40.

[0129] The spacing distance between the third lens and the fourth lens on the optical axis is T34, and the spacing distance between the fourth lens and the fifth lens on the optical axis is T45, and the following conditions can be satisfied: 0.50 < T34 / T45 < 1.80. Thereby, it helps to reduce the assembly difficulty. Among them, the following conditions can also be satisfied: 0.60 < T34 / T45 < 1.60.

[0130] The maximum effective radius of the object side surface of the second lens is Y2R1, and the maximum effective radius of the image side surface of the seventh lens is Y7R2, and the following conditions can be satisfied: 2.20 < Y7R2 / Y2R1 < 5.00. Thereby, the effective diameter height ratio between the image side surface of the seventh lens and the object side surface of the second lens can be balanced, which helps to expand the viewing angle. Among them, the following conditions can also be satisfied: 2.70 < Y7R2 / Y2R1 < 4.00. Please refer to Figure 35 , which is a schematic diagram showing the parameters Y2R1 and Y7R2 in the first embodiment of the present disclosure.

[0131] All the technical features in the imaging optical system disclosed in the present disclosure can be combined and configured to achieve the corresponding effects.

[0132] In the imaging optical system disclosed in this invention, the lens can be made of glass or plastic. If the lens is made of glass, the freedom of refractive power configuration of the imaging optical system can be increased, and the influence of external environmental temperature changes on imaging can be reduced. Glass lenses can be manufactured using techniques such as grinding or molding. If the lens is made of plastic, production costs can be effectively reduced. Furthermore, spherical or aspherical (ASP) surfaces can be incorporated into the lens surface. Spherical lenses reduce manufacturing difficulty, while aspherical surfaces provide more controllable variables to reduce aberrations, decrease the number of lenses, and effectively reduce the overall length of the imaging optical system disclosed in this invention. Further, aspherical surfaces can be manufactured using methods such as plastic injection molding or molding glass lenses.

[0133] In the imaging optical system disclosed herein, if the lens surface is aspherical, it means that all or part of the optically effective area of ​​the lens surface is aspherical.

[0134] The imaging optical system disclosed herein allows for the selective addition of additives 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 nm to 800 nm wavelength range to help reduce excess red or infrared light; or they may filter out light in the 350 nm to 450 nm wavelength range to reduce excess blue or ultraviolet light. Therefore, the additives 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.

[0135] In the imaging optical system 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.

[0136] In the imaging optical system disclosed herein, the inflection point of the lens surface refers to the boundary point where the curvature of the lens surface changes from positive to negative. The critical point of the lens surface refers to the point of tangency on the tangent line between a plane perpendicular to the optical axis and the lens surface, and the critical point is not located on the optical axis.

[0137] In the imaging optical system disclosed herein, the imaging surface of the imaging optical system 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.

[0138] In the imaging optical system disclosed herein, one or more imaging correction elements (such as planar elements) can be selectively disposed between the lens closest to the imaging plane and the imaging plane in the imaging optical path to achieve the effect of correcting image curvature (such as image 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 in the object-side direction close to the imaging plane.

[0139] In the imaging optical system disclosed herein, at least one element with a deflecting optical path function, such as a prism or a mirror, can be selectively arranged between the object and the imaging surface in the imaging optical path. The prism surface or mirror surface can be a plane, spherical, aspherical, or freeform surface, providing a more flexible spatial configuration for the imaging optical system, allowing the thinner and lighter electronic device to be independent of the overall optical length of the imaging optical system. For further explanation, please refer to... Figure 36 and Figure 37 ,in Figure 36 This is a schematic diagram illustrating an arrangement of an optical path reversing element according to the present disclosure in an imaging optical system, and Figure 37 This is a schematic diagram illustrating another configuration of an optical path reversing element according to this disclosure in an imaging optical system. For example... Figure 36 and Figure 37 As shown, the imaging optical system can travel along the optical path from the subject (not shown) to the imaging plane IMG, and sequentially includes a first optical axis OA1, an optical path deflection element LF, and a second optical axis OA2, wherein the optical path deflection element LF can be as follows: Figure 36 The image shown is positioned between the lens group LG of the subject and the image-capturing optical system, or as... Figure 37 The diagram shows the lens group LG positioned between the imaging optical system and the imaging plane IMG. Please also refer to... Figure 38 This is a schematic diagram illustrating an arrangement of two optical path reversing elements in an imaging optical system according to the present disclosure, such as... Figure 38As shown, the imaging optical system can also follow the light path from the subject (not shown) to the imaging plane IMG, and sequentially includes a first optical axis OA1, a first optical path reversing element LF1, a second optical axis OA2, a second optical path reversing element LF2, and a third optical axis OA3. The first optical path reversing element LF1 is disposed between the subject and the lens group LG of the imaging optical system, and the second optical path reversing element LF2 is disposed between the lens group LG of the imaging optical system and the imaging plane IMG. Furthermore, the direction of light travel along the first optical axis OA1 can be as follows: Figure 38 The direction shown is the same as the direction of light travel along the third optical axis OA3. The imaging optical system may also be optionally configured with more than three optical path deflection elements, and this disclosure is not limited to the type, number and position of the optical path deflection elements disclosed in the figures.

[0140] The imaging optical system disclosed herein may include at least one aperture stop, which may be located before 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, and may be used to reduce stray light and help improve image quality.

[0141] In the imaging optical system disclosed in this invention, the aperture can be configured as a front aperture or a center aperture. A front aperture means the aperture is positioned between the subject and the first lens, while a center aperture means the aperture is positioned between the first lens and the imaging plane. A front aperture allows for a longer distance between the exit pupil and the imaging plane, creating a telecentric effect and increasing the efficiency of image reception by the CCD or CMOS sensor. A center aperture helps to widen the viewing angle of the imaging optical system.

[0142] This disclosure may appropriately incorporate a variable aperture element, which can be a mechanical component or a light-regulating element, capable of electrically or signal-controlled aperture size and shape. The mechanical component may include movable parts such as blade assemblies or shielding plates; the light-regulating element may include shielding materials such as filter elements, electrochromic materials, or liquid crystal layers. The variable aperture element can enhance image adjustment capabilities by controlling the amount of light entering the image or the exposure time. Furthermore, the variable aperture element can also be the aperture of this disclosure, allowing adjustment of image quality, such as depth of field or exposure speed, by changing the aperture value.

[0143] This disclosure allows for the appropriate placement of one or more optical elements to restrict the form of light passing through the imaging optical system. These optical elements may be filters, polarizers, etc., but this disclosure is not limited thereto. Furthermore, the optical elements may be monolithic elements, composite components, or thin films, but this disclosure is not limited thereto. The optical elements can be placed between the object end, image end, or lens of the imaging optical system to control the passage of specific forms of light, thereby meeting application requirements.

[0144] The imaging optical system 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.

[0145] The imaging optical system 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.

[0146] In the imaging optical system disclosed herein, the object side and the 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.

[0147] Based on the above implementation methods, specific embodiments are presented below and described in detail with reference to the accompanying drawings.

[0148] <First Embodiment>

[0149] Please refer to Figures 1 to 2 ,in Figure 1 A schematic diagram of an image-capturing device according to a first embodiment of this disclosure is shown. Figure 2 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the first embodiment. Figure 1It is known that the image capturing device 1 includes an image capturing optical system (unlabeled) and an electronic photosensitive element IS. The image capturing optical system, along the optical path from the object side to the image side, sequentially includes a first lens E1, an aperture ST, a second lens E2, a third lens E3, an aperture stop S1, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter element E8, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG. The image capturing optical system includes seven lenses (E1, E2, E3, E4, E5, E6, and E7), and there are no other interposed lenses between each lens.

[0150] The first lens E1 has positive 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 aspherical. Its object-side surface has a point of inflection, and its image-side surface also has a point of inflection.

[0151] The second lens E2 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 surfaces are aspherical, and its object-side surface has two inflection points.

[0152] The third lens E3 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection, its image-side surface has a point of inflection, and its object-side surface has a critical point off-axis.

[0153] The fourth lens E4 has positive refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical.

[0154] The fifth lens E5 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection, its image-side surface has a point of inflection, its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0155] 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. Its object-side surface has two inflection points, and its image-side surface has three inflection points. Its object-side surface has one critical point off-axis, and its image-side surface has two critical points off-axis.

[0156] The seventh lens E7 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has four inflection points, and its image-side surface has one inflection point. Its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0157] The filter element E8 is made of glass and is located between the seventh lens E7 and the imaging surface IMG. It does not affect the focal length of the imaging optical system.

[0158] The equations for the aspherical surfaces of the above lenses are expressed as follows:

[0159]

[0160] 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;

[0161] Y: The perpendicular distance between a point on the aspherical curve and the optical axis;

[0162] R: Radius of curvature;

[0163] k: cone coefficient; and

[0164] Ai: The i-th order aspherical coefficient.

[0165] In the imaging optical system of the first embodiment, the focal length of the imaging optical system is f, the aperture value (F-number) of the imaging optical system is Fno, half of the maximum angle of view of the imaging optical system is HFOV, and the maximum angle of view of the imaging optical system is FOV, with the following values: f = 6.98 mm, Fno = 1.80, HFOV = 45.0 degrees, and FOV = 90.0 degrees.

[0166] The distance on the optical axis from the object-side surface of the first lens E1 to the imaging plane IMG is TL, and the maximum imaging height of the imaging optical system is ImgH, which satisfies the following condition: TL / ImgH=1.82.

[0167] The distance on the optical axis from the object-side surface of the first lens E1 to the imaging plane IMG is TL, and the focal length of the imaging optical system is f, which satisfies the following condition: TL / f = 1.84.

[0168] The distance from the aperture ST to the imaging plane IMG on the optical axis is SL, and the focal length of the imaging optical system is f, which satisfies the following condition: SL / f = 1.65.

[0169] The distance from the object-side surface of the first lens E1 to the imaging plane IMG on the optical axis is TL, and the radius of curvature of the object-side surface of the first lens E1 is R1, which satisfies the following condition: TL / R1=-0.69.

[0170] The distance from the object-side surface of the first lens E1 to the imaging plane IMG on the optical axis is TL, and the radius of curvature of the object-side surface of the second lens E2 is R3, which satisfies the following condition: TL / R3=-0.58.

[0171] Half of the maximum field of view in the imaging optical system is called HFOV, which satisfies the following condition: tan(HFOV) = 1.00.

[0172] The focal length of the imaging optical system is f, the focal length of the first lens E1 is f1, and the focal length of the second lens E2 is f2. They satisfy the following condition: f / f1 + f / f2 = 1.27.

[0173] The focal length of the fourth lens E4 is f4, and the focal length of the seventh lens E7 is f7. They satisfy the following condition: |f4 / f7|=0.87.

[0174] The focal length of the fifth lens E5 is f5, and the focal length of the sixth lens E6 is f6. They satisfy the following condition: |f5 / f6|=1.21.

[0175] The focal length of the sixth lens E6 is f6, and the focal length of the seventh lens E7 is f7. They satisfy the following condition: |f6 / f7|=0.64.

[0176] The focal length of the imaging optical system is f, the radius of curvature of the object-side surface of the fifth lens E5 is R9, and the radius of curvature of the image-side surface of the fifth lens E5 is R10. They satisfy the following condition: |f / R9|+|f / R10|=5.76.

[0177] The radius of curvature of the image-side surface of the third lens E3 is R6, and the radius of curvature of the object-side surface of the fourth lens E4 is R7, which satisfies the following condition: R6 / R7=-0.25.

[0178] The radius of curvature of the image-side surface of the fifth lens E5 is R10, and the radius of curvature of the object-side surface of the sixth lens E6 is R11, which satisfies the following condition: R10 / R11=-0.39.

[0179] The radius of curvature of the object-side surface of the second lens E2 is R3, and the radius of curvature of the image-side surface of the second lens E2 is R4, which satisfies the following condition: (R3-R4) / (R3+R4)=0.63.

[0180] The total thickness of all lenses in the imaging optical system along the optical axis is ΣCT, and the total distance between all adjacent lenses along the optical axis is ΣAT, satisfying the following condition: ΣCT / ΣAT = 4.50. In this embodiment, the distance between two adjacent lenses along the optical axis refers to the distance between two adjacent mirror surfaces of two adjacent lenses along the optical axis. In this embodiment, ΣCT is the total thickness of the first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, and seventh lens E7 along the optical axis. In this embodiment, ΣAT is the total distance between any two adjacent lenses among the first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, and seventh lens E7 along the optical axis.

[0181] The thickness of the second lens E2 on the optical axis is CT2, and the thickness of the sixth lens E6 on the optical axis is CT6, which satisfies the following condition: CT6 / CT2=0.65.

[0182] The optical axis spacing between the first lens E1 and the second lens E2 is T12, the optical axis spacing between the second lens E2 and the third lens E3 is T23, the optical axis spacing between the third lens E3 and the fourth lens E4 is T34, the optical axis spacing between the fourth lens E4 and the fifth lens E5 is T45, the optical axis spacing between the fifth lens E5 and the sixth lens E6 is T56, and the optical axis spacing between the sixth lens E6 and the seventh lens E7 is T67. These conditions satisfy the following: (T12+T23+T56+T67) / (T34+T45)=0.20.

[0183] The distance between the third lens E3 and the fourth lens E4 on the optical axis is T34, and the distance between the fourth lens E4 and the fifth lens E5 on the optical axis is T45. They satisfy the following condition: T34 / T45=1.13.

[0184] The distance between the fourth lens E4 and the fifth lens E5 on the optical axis is T45, and the distance between the sixth lens E6 and the seventh lens E7 on the optical axis is T67, which satisfies the following condition: T67 / T45=0.07.

[0185] The Abbe number of the fourth lens E4 is V4, which satisfies the following condition: V4 = 56.0.

[0186] The maximum effective radius of the object-side surface of the second lens E2 is Y2R1, and the maximum effective radius of the image-side surface of the seventh lens E7 is Y7R2, which satisfies the following condition: Y7R2 / Y2R1=3.01.

[0187] Please refer to Table 1A and Table 1B below.

[0188]

[0189]

[0190]

[0191]

[0192] Table 1A is... Figure 1 The first embodiment provides detailed structural data, where the units for radius of curvature, thickness, and focal length are millimeters (mm), and surfaces 0 to 19 sequentially represent surfaces from the object side to the image side. Table 1B shows the aspherical data in the first embodiment, where k is the cone coefficient in the aspherical curve equation, and A4 to A16 represent the 4th to 16th order aspherical coefficients of each surface. Furthermore, the tables for the following embodiments are corresponding schematic diagrams and aberration curves for each embodiment. The definitions of the data in the tables are the same as those in Tables 1A and 1B of the first embodiment, and will not be repeated here.

[0193] <Second Embodiment>

[0194] Please refer to Figures 3 to 4 ,in Figure 3 A schematic diagram of an image-capturing device according to a second embodiment of this disclosure is shown. Figure 4 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the second embodiment. Figure 3 It is known that the image capturing device 2 includes an image capturing optical system (unlabeled) and an electronic photosensitive element IS. The image capturing optical system, along the optical path from the object side to the image side, sequentially includes a first lens E1, an aperture ST, a second lens E2, a third lens E3, an aperture stop S1, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter element E8, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG. The image capturing optical system includes seven lenses (E1, E2, E3, E4, E5, E6, and E7), and there are no other interposed lenses between each lens.

[0195] The first lens E1 has positive 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 aspherical. Its object-side surface has a point of inflection, its image-side surface has a point of inflection, and its object-side surface has a critical point off-axis.

[0196] The second lens E2 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 surfaces are aspherical, and its object-side surface has two inflection points.

[0197] The third lens E3 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical, and its image-side surface has a point of inflection.

[0198] The fourth lens E4 has positive refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both surfaces are aspherical, and its object-side surface has a point of inflection.

[0199] The fifth lens E5 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both surfaces are aspherical. Its object-side surface has a point of inflection, its image-side surface has a point of inflection, and its image-side surface has a critical point off-axis.

[0200] 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. Its object-side surface has one inflection point, and its image-side surface has two inflection points. Its object-side surface has one critical point off-axis, and its image-side surface has two critical points off-axis.

[0201] The seventh lens E7 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has three inflection points, and its image-side surface has one inflection point. Its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0202] The filter element E8 is made of glass and is located between the seventh lens E7 and the imaging surface IMG. It does not affect the focal length of the imaging optical system.

[0203] Please refer to Table 2A and Table 2B below.

[0204]

[0205]

[0206]

[0207] In the second embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in Table 2C are the same as in the first embodiment and will not be repeated here.

[0208]

[0209] <Third Embodiment>

[0210] Please refer to Figures 5 to 6 ,in Figure 5 A schematic diagram of an image-capturing device according to a third embodiment of this disclosure is shown. Figure 6 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the third embodiment. Figure 5 It is known that the image capturing device 3 includes an image capturing optical system (unlabeled) and an electronic photosensitive element IS. The image capturing optical system, along the optical path from the object side to the image side, sequentially includes a first lens E1, an aperture ST, a second lens E2, a third lens E3, an aperture stop S1, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter element E8, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG. The image capturing optical system includes seven lenses (E1, E2, E3, E4, E5, E6, E7), and there are no other interposed lenses between each lens.

[0211] The first lens E1 has positive 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 aspherical. Its object-side surface has a point of inflection, and its image-side surface also has a point of inflection.

[0212] The second lens E2 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both surfaces are aspherical, and its object-side surface has a point of inflection.

[0213] The third lens E3 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection, its image-side surface has a point of inflection, and its object-side surface has a critical point off-axis.

[0214] The fourth lens E4 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has two inflection points, and its image-side surface has one inflection point.

[0215] The fifth lens E5 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both surfaces are aspherical. Its object-side surface has two inflection points, its image-side surface has one inflection point, and its image-side surface has a critical point off-axis.

[0216] 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. Its object-side surface has two inflection points, and its image-side surface has three inflection points. Its object-side surface has one critical point off-axis, and its image-side surface has two critical points off-axis.

[0217] The seventh lens E7 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both surfaces are aspherical. Its object-side surface has four inflection points, its image-side surface has one inflection point, its object-side surface has three critical points off-axis, and its image-side surface has one critical point off-axis.

[0218] The filter element E8 is made of glass and is located between the seventh lens E7 and the imaging surface IMG. It does not affect the focal length of the imaging optical system.

[0219] Please refer to Table 3A and Table 3B below.

[0220]

[0221]

[0222]

[0223] In the third embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in Table 3C are the same as in the first embodiment and will not be repeated here.

[0224]

[0225] <Fourth Embodiment>

[0226] Please refer to Figures 7 to 8 ,in Figure 7 A schematic diagram of an image-capturing device according to the fourth embodiment of this disclosure is shown. Figure 8 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the fourth embodiment. Figure 7 It is known that the image capturing device 4 includes an image capturing optical system (unlabeled) and an electronic photosensitive element IS. The image capturing optical system, along the optical path from the object side to the image side, sequentially includes a first lens E1, an aperture ST, a second lens E2, a third lens E3, an aperture stop S1, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter element E8, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG. The image capturing optical system includes seven lenses (E1, E2, E3, E4, E5, E6, and E7), and there are no other interposed lenses between each lens.

[0227] The first lens E1 has positive 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 aspherical. Its object-side surface has a point of inflection, and its image-side surface also has a point of inflection.

[0228] The second lens E2 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 surfaces are aspherical, and its object-side surface has two inflection points.

[0229] The third lens E3 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection, its image-side surface has a point of inflection, its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0230] The fourth lens E4 has positive refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection, and its image-side surface also has a point of inflection.

[0231] The fifth lens E5 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both surfaces are aspherical. Its object-side surface has two inflection points, its image-side surface has one inflection point, and its image-side surface has a critical point off-axis.

[0232] 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. Its object-side surface has two inflection points, and its image-side surface has three inflection points. Its object-side surface has one critical point off-axis, and its image-side surface has two critical points off-axis.

[0233] The seventh lens E7 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has four inflection points, and its image-side surface has one inflection point. Its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0234] The filter element E8 is made of glass and is located between the seventh lens E7 and the imaging surface IMG. It does not affect the focal length of the imaging optical system.

[0235] Please refer to Table 4A and Table 4B below.

[0236]

[0237]

[0238]

[0239] In the fourth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in Table 4C are the same as in the first embodiment and will not be repeated here.

[0240]

[0241] <Fifth Embodiment>

[0242] Please refer to Figures 9 to 10 ,in Figure 9 A schematic diagram of an image-capturing device according to the fifth embodiment of this disclosure is shown. Figure 10 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the fifth embodiment. Figure 9 It is known that the image capturing device 5 includes an image capturing optical system (unlabeled) and an electronic photosensitive element IS. The image capturing optical system, along the optical path from the object side to the image side, sequentially includes a first lens E1, an aperture ST, a second lens E2, a third lens E3, an aperture stop S1, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter element E8, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG. The image capturing optical system includes seven lenses (E1, E2, E3, E4, E5, E6, E7), and there are no other interposed lenses between each lens.

[0243] The first lens E1 has positive refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection, and its image-side surface also has a point of inflection.

[0244] The second lens E2 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.

[0245] The third lens E3 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection, its image-side surface has a point of inflection, its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0246] The fourth lens E4 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection and a critical point off-axis.

[0247] The fifth lens E5 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both surfaces are aspherical. Its object-side surface has two inflection points, its image-side surface has one inflection point, and its image-side surface has a critical point off-axis.

[0248] 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. Its object-side surface has one inflection point, and its image-side surface has three inflection points. Its object-side surface has one critical point off-axis, and its image-side surface has two critical points off-axis.

[0249] The seventh lens E7 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has four inflection points, and its image-side surface has one inflection point. Its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0250] The filter element E8 is made of glass and is located between the seventh lens E7 and the imaging surface IMG. It does not affect the focal length of the imaging optical system.

[0251] Please refer to Table 5A and Table 5B below.

[0252]

[0253]

[0254]

[0255]

[0256] In the fifth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions described in Table 5C are the same as in the first embodiment and will not be repeated here.

[0257]

[0258] <Sixth Embodiment>

[0259] Please refer to Figures 11 to 12 ,in Figure 11A schematic diagram of an image-capturing device according to the sixth embodiment of this disclosure is shown. Figure 12 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the sixth embodiment. Figure 11 It is known that the image capturing device 6 includes an image capturing optical system (unlabeled) and an electronic photosensitive element IS. The image capturing optical system, along the optical path from the object side to the image side, sequentially includes a first lens E1, an aperture ST, a second lens E2, a third lens E3, an aperture stop S1, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter element E8, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG. The image capturing optical system includes seven lenses (E1, E2, E3, E4, E5, E6, and E7), and there are no other interposed lenses between each lens.

[0260] The first lens E1 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has two inflection points, and its image-side surface has one inflection point.

[0261] The second lens E2 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.

[0262] The third lens E3 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection, its image-side surface has a point of inflection, and its object-side surface has a critical point off-axis.

[0263] The fourth lens E4 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection, its image-side surface has a point of inflection, and its object-side surface has a critical point off-axis.

[0264] The fifth lens E5 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both surfaces are aspherical. Its object-side surface has two inflection points, its image-side surface has one inflection point, and its image-side surface has a critical point off-axis.

[0265] 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. Its object-side surface has two inflection points, and its image-side surface has three inflection points. Its object-side surface has one critical point off-axis, and its image-side surface has two critical points off-axis.

[0266] The seventh lens E7 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both surfaces are aspherical. Its object-side surface has four inflection points, its image-side surface has two inflection points, its object-side surface has three critical points off-axis, and its image-side surface has one critical point off-axis.

[0267] The filter element E8 is made of glass and is located between the seventh lens E7 and the imaging surface IMG. It does not affect the focal length of the imaging optical system.

[0268] Please refer to Table 6A and Table 6B below.

[0269]

[0270]

[0271]

[0272] In the sixth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in Table 6C are the same as in the first embodiment and will not be repeated here.

[0273]

[0274] <Seventh Embodiment>

[0275] Please refer to Figures 13 to 14 ,in Figure 13 A schematic diagram of an image-capturing device according to the seventh embodiment of this disclosure is shown. Figure 14 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the seventh embodiment. Figure 13 It is known that the image capturing device 7 includes an image capturing optical system (unlabeled) and an electronic photosensitive element IS. The image capturing optical system, along the optical path from the object side to the image side, sequentially includes a first lens E1, an aperture ST, a second lens E2, a third lens E3, an aperture stop S1, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter element E8, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG. The image capturing optical system includes seven lenses (E1, E2, E3, E4, E5, E6, E7), and there are no other interposed lenses between each lens.

[0276] The first lens E1 has positive 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 aspherical. Its object-side surface has a point of inflection, and its image-side surface also has a point of inflection.

[0277] The second lens E2 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 surfaces are aspherical, and its object-side surface has two inflection points.

[0278] The third lens E3 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection, its image-side surface has a point of inflection, and its object-side surface has a critical point off-axis.

[0279] The fourth lens E4 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection, its image-side surface has a point of inflection, and its object-side surface has a critical point off-axis.

[0280] The fifth lens E5 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both surfaces are aspherical. Its object-side surface has two inflection points, and its image-side surface has one inflection point. Its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0281] The sixth lens E6 has positive refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has three inflection points, and its image-side surface has three inflection points. Its object-side surface has two critical points off-axis, and its image-side surface has two critical points off-axis.

[0282] The seventh lens E7 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both surfaces are aspherical. Its object-side surface has two inflection points, and its image-side surface has one inflection point. Its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0283] The filter element E8 is made of glass and is located between the seventh lens E7 and the imaging surface IMG. It does not affect the focal length of the imaging optical system.

[0284] Please refer to Table 7A and Table 7B below.

[0285]

[0286]

[0287]

[0288]

[0289] In the seventh embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in Table 7C are the same as in the first embodiment and will not be repeated here.

[0290]

[0291] <Eighth Embodiment>

[0292] Please refer to Figures 15 to 16 ,in Figure 15 A schematic diagram of an image-capturing device according to the eighth embodiment of this disclosure is shown. Figure 16 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the eighth embodiment. Figure 15 It is known that the image capturing device 8 includes an image capturing optical system (unlabeled) and an electronic photosensitive element IS. The image capturing optical system, along the optical path from the object side to the image side, sequentially includes a first lens E1, an aperture ST, a second lens E2, a third lens E3, an aperture stop S1, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter element E8, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG. The image capturing optical system includes seven lenses (E1, E2, E3, E4, E5, E6, and E7), and there are no other interposed lenses between each lens.

[0293] The first lens E1 has positive refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection, and its image-side surface also has a point of inflection.

[0294] The second lens E2 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.

[0295] The third lens E3 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection, its image-side surface has a point of inflection, and its object-side surface has a critical point off-axis.

[0296] The fourth lens E4 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection and a critical point off-axis.

[0297] The fifth lens E5 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both surfaces are aspherical. Its object-side surface has two inflection points, and its image-side surface has one inflection point. Its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0298] 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. Its object-side surface has one inflection point, and its image-side surface has two inflection points. Its object-side surface has one critical point off-axis, and its image-side surface has two critical points off-axis.

[0299] The seventh lens E7 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both surfaces are aspherical. Its object-side surface has two inflection points, and its image-side surface has one inflection point. Its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0300] The filter element E8 is made of glass and is located between the seventh lens E7 and the imaging surface IMG. It does not affect the focal length of the imaging optical system.

[0301] Please refer to Table 8A and Table 8B below.

[0302]

[0303]

[0304]

[0305]

[0306] In the eighth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in Table 8C are the same as in the first embodiment and will not be repeated here.

[0307] <Ninth Embodiment>

[0308] Please refer to Figures 17 to 18 ,in Figure 17 A schematic diagram of an image-capturing device according to the ninth embodiment of this disclosure is shown. Figure 18 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the ninth embodiment. Figure 17It is known that the image capturing device 9 includes an image capturing optical system (unlabeled) and an electronic photosensitive element IS. The image capturing optical system, along the optical path from the object side to the image side, sequentially includes a first lens E1, an aperture ST, a second lens E2, a third lens E3, an aperture stop S1, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter element E8, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG. The image capturing optical system includes seven lenses (E1, E2, E3, E4, E5, E6, and E7), and there are no other interposed lenses between each lens.

[0309] The first lens E1 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection, and its image-side surface also has a point of inflection.

[0310] The second lens E2 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both surfaces are aspherical, and its object-side surface has a point of inflection.

[0311] The third lens, E3, has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both surfaces are aspherical, and its object-side surface has a point of inflection.

[0312] Its image-side surface has an inflection point, and its object-side surface has a critical point off-axis.

[0313] The fourth lens E4 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection and a critical point off-axis.

[0314] The fifth lens E5 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both surfaces are aspherical. Its object-side surface has two inflection points, its image-side surface has one inflection point, and its image-side surface has a critical point off-axis.

[0315] 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. Its object-side surface has two inflection points, and its image-side surface has three inflection points. Its object-side surface has one critical point off-axis, and its image-side surface has two critical points off-axis.

[0316] The seventh lens E7 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has four inflection points, and its image-side surface has one inflection point. Its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0317] The filter element E8 is made of glass and is located between the seventh lens E7 and the imaging surface IMG. It does not affect the focal length of the imaging optical system.

[0318] Please refer to Table 9A and Table 9B below.

[0319]

[0320]

[0321]

[0322]

[0323] In the ninth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in Table 9C are the same as in the first embodiment and will not be repeated here.

[0324] <Tenth Embodiment>

[0325] Please refer to Figures 19 to 20 ,in Figure 19 A schematic diagram of an image-capturing device according to the tenth embodiment of this disclosure is shown. Figure 20 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the tenth embodiment. Figure 19 It is known that the image capturing device 10 includes an image capturing optical system (unlabeled) and an electronic photosensitive element IS. The image capturing optical system, along the optical path from the object side to the image side, sequentially includes a first lens E1, an aperture ST, a second lens E2, a third lens E3, an aperture stop S1, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter element E8, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG. The image capturing optical system includes seven lenses (E1, E2, E3, E4, E5, E6, and E7), and there are no other interposed lenses between each lens.

[0326] The first lens E1 has positive 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 aspherical. Its object-side surface has a point of inflection, and its image-side surface also has a point of inflection.

[0327] The second lens E2 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 surfaces are aspherical, and its object-side surface has two inflection points.

[0328] The third lens, E3, has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both surfaces are aspherical, and its object-side surface has a point of inflection.

[0329] Its image-side surface has an inflection point, and its object-side surface has a critical point off-axis.

[0330] The fourth lens E4 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection, its image-side surface has a point of inflection, and its object-side surface has a critical point off-axis.

[0331] The fifth lens E5 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both surfaces are aspherical. Its object-side surface has two inflection points, and its image-side surface has one inflection point. Its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0332] 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. Its object-side surface has two inflection points, and its image-side surface has three inflection points. Its object-side surface has one critical point off-axis, and its image-side surface has two critical points off-axis.

[0333] The seventh lens E7 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has four inflection points, and its image-side surface has one inflection point. Its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0334] The filter element E8 is made of glass and is located between the seventh lens E7 and the imaging surface IMG. It does not affect the focal length of the imaging optical system.

[0335] Please refer to Table 10A and Table 10B below.

[0336]

[0337]

[0338]

[0339]

[0340] In the tenth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in Table 10C are the same as in the first embodiment and will not be repeated here.

[0341]

[0342] <Eleventh Embodiment>

[0343] Please refer to Figures 21 to 22 ,in Figure 21 A schematic diagram of an image-capturing device according to the eleventh embodiment of this disclosure is shown. Figure 22 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the eleventh embodiment. Figure 21 As can be seen, the image capturing device 11 includes an image capturing optical system (unlabeled) and an electronic photosensitive element IS. The image capturing optical system, along the optical path from the object side to the image side, sequentially includes a first lens E1, an aperture ST, a second lens E2, a third lens E3, an aperture stop S1, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter element E8, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG. The image capturing optical system includes seven lenses (E1, E2, E3, E4, E5, E6, and E7), and there are no other interposed lenses between each lens.

[0344] The first lens E1 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has two inflection points, its image-side surface has one inflection point, and its object-side surface has a critical point off-axis.

[0345] The second lens E2 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both surfaces are aspherical, and its object-side surface has two inflection points.

[0346] The third lens E3 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection, its image-side surface has a point of inflection, and its object-side surface has a critical point off-axis.

[0347] The fourth lens E4 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection and a critical point off-axis.

[0348] The fifth lens E5 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both surfaces are aspherical. Its object-side surface has two inflection points, its image-side surface has one inflection point, and its image-side surface has a critical point off-axis.

[0349] 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. Its object-side surface has one inflection point, and its image-side surface has three inflection points. Its object-side surface has one critical point off-axis, and its image-side surface has two critical points off-axis.

[0350] The seventh lens E7 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both surfaces are aspherical. Its object-side surface has four inflection points, its image-side surface has one inflection point, its object-side surface has three critical points off-axis, and its image-side surface has one critical point off-axis.

[0351] The filter element E8 is made of glass and is located between the seventh lens E7 and the imaging surface IMG. It does not affect the focal length of the imaging optical system.

[0352] Please refer to Table 11A and Table 11B below.

[0353]

[0354]

[0355]

[0356]

[0357] In the eleventh embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in Table 11C are the same as in the first embodiment and will not be repeated here.

[0358]

[0359] <Twelfth Embodiment>

[0360] Please refer to Figures 23 to 24 ,in Figure 23 A schematic diagram of an image-capturing device according to the twelfth embodiment of this disclosure is shown. Figure 24 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the twelfth embodiment. Figure 23It is known that the image capturing device 12 includes an image capturing optical system (unlabeled) and an electronic photosensitive element IS. The image capturing optical system, along the optical path from the object side to the image side, sequentially includes a first lens E1, an aperture ST, a second lens E2, a third lens E3, an aperture stop S1, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter element E8, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG. The image capturing optical system includes seven lenses (E1, E2, E3, E4, E5, E6, and E7), and there are no other interposed lenses between each lens.

[0361] The first lens E1 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical.

[0362] The second lens E2 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical, and its object-side surface has a point of inflection.

[0363] The third lens E3 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection, its image-side surface has a point of inflection, and its object-side surface has a critical point off-axis.

[0364] The fourth lens E4 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection and a critical point off-axis.

[0365] The fifth lens E5 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both surfaces are aspherical. Its object-side surface has two inflection points, its image-side surface has one inflection point, and its image-side surface has a critical point off-axis.

[0366] 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. Its object-side surface has two inflection points, and its image-side surface has three inflection points. Its object-side surface has one critical point off-axis, and its image-side surface has two critical points off-axis.

[0367] The seventh lens E7 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both surfaces are aspherical. Its object-side surface has four inflection points, its image-side surface has two inflection points, its object-side surface has three critical points off-axis, and its image-side surface has one critical point off-axis.

[0368] The filter element E8 is made of glass and is located between the seventh lens E7 and the imaging surface IMG. It does not affect the focal length of the imaging optical system.

[0369] Please refer to Table 12A and Table 12B below.

[0370]

[0371]

[0372]

[0373]

[0374] In the twelfth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in Table 12C are the same as in the first embodiment and will not be repeated here.

[0375]

[0376] <Thirteenth Embodiment>

[0377] Please refer to Figure 25 This is a perspective view illustrating an image-capturing device according to a thirteenth embodiment of the present 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 image-capturing optical system of the first embodiment described above, a lens barrel (not otherwise labeled) for carrying the image-capturing optical system, and a support device (Holder Member, not otherwise labeled). The imaging lens 101 may also be configured with the image-capturing optical system of other embodiments described above, and the present 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.

[0378] The driving device 102 may have an auto-focus function, and its driving method can use a driving system such as a voice coil motor (VCM), microelectromechanical systems (MEMS), piezoelectric systems, and shape memory alloys. The driving device 102 enables the imaging lens 101 to achieve a better imaging position, allowing clear images to be captured of the subject at different object distances. In addition, the imaging device 100 is equipped with a high-sensitivity and low-noise electronic image sensor 103 (such as CMOS or CCD) located on the imaging surface of the imaging optical system, which can truly present the good image quality of the imaging optical system.

[0379] The image stabilization module 104 may be, for example, an accelerometer, a gyroscope, or a Hall effect sensor. The drive unit 102 may work in conjunction with the image stabilization module 104 to form an optical image stabilization (OIS) device. By adjusting the changes in different axes of the imaging lens 101, it can compensate for the blurry image caused by shaking during shooting, or use image compensation technology in the imaging software to provide electronic image stabilization (EIS), further improving the image quality of shooting in dynamic and low-light scenes.

[0380] <Fourteenth Embodiment>

[0381] Please refer to Figures 26 to 27 ,in Figure 26 A perspective view of one side of an electronic device according to the fourteenth embodiment of this disclosure is shown, and Figure 27 Draw Figure 26 A three-dimensional diagram of the other side of the electronic device.

[0382] In this embodiment, the electronic device 200 is a smartphone. The electronic device 200 includes, according to the thirteenth embodiment, image-capturing devices 100, 100a, 100b, and 100c, and a display module 201. (As...) Figure 26 As shown, image capturing devices 100, 100a, and 100b are all located on the same side of the electronic device 200 and are all single-focus. Figure 27As shown, the image capturing device 100c and the display module 201 are both located on the other side of the electronic device 200. The image capturing device 100c can serve as a front-facing camera to provide a selfie function, but this disclosure is not limited thereto. Furthermore, the image capturing devices 100a, 100b, and 100c can all include the image capturing optical system disclosed herein and can all have a structural configuration similar to that of the image capturing device 100. In detail, each of the image capturing devices 100a, 100b, and 100c can include an imaging lens, a driving device, an electronic photosensitive element, and an image stabilization module. The imaging lenses of each of the image capturing devices 100a, 100b, and 100c can each include, for example, an optical lens group (as disclosed herein), a lens barrel for supporting the optical lens group, and a support device.

[0383] Image capturing device 100 is a wide-angle image capturing device, image capturing device 100a is a telephoto 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 an optical zoom shooting effect. Furthermore, as... Figure 27 As shown, the opening of the image capturing device 100c can be non-circular, and the lens barrel or lens inside the image capturing device 100c can be cut at the outer diameter to have a chamfered edge to fit the non-circular opening. This allows for a further reduction in the single-axis length of the image capturing device 100c, which helps to reduce the lens volume, increase the area ratio of the display module 201 relative to the electronic device 200, and reduce the thickness of the electronic device 200, further achieving module miniaturization. The aforementioned electronic device 200 is exemplified by including 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.

[0384] <Fifteenth Embodiment>

[0385] Please refer to Figures 28 to 30 ,in Figure 28 A perspective view of one side of an electronic device according to the fifteenth embodiment of this disclosure is shown. Figure 29 Draw Figure 28 A three-dimensional diagram of the other side of the electronic device, and Figure 30 Draw Figure 28 System block diagram of an electronic device.

[0386] In this embodiment, the electronic device 300 is a smartphone. The electronic device 300 includes, according to the thirteenth embodiment, image capturing devices 100, 100d, 100e, 100f, and 100g, 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 and 100d are both located on the same side of the electronic device 300. The focus assist module 302 may employ a laser rangefinder or a Time-of-Flight (ToF) module, but this disclosure is not limited thereto. Image capturing devices 100e, 100f, and 100g, along with display module 304, are all located on the other side of electronic device 300. Display module 304 can serve as a user interface, allowing image capturing devices 100e, 100f, and 100g to function as front-facing cameras for selfies; however, this disclosure is not limited to this. Furthermore, image capturing devices 100d, 100e, 100f, and 100g can all include the image capturing optical system disclosed herein and can all have a structural configuration similar to that of image capturing device 100. Specifically, each of image capturing devices 100d, 100e, 100f, and 100g can include an imaging lens, a driving device, an electronic photosensitive element, and an image stabilization module. The imaging lenses of imaging devices 100d, 100e, 100f and 100g may each include, for example, an optical lens group of the imaging optical system disclosed herein, a lens barrel for carrying the optical lens group and a support device.

[0387] Image capturing device 100 is a wide-angle image capturing device, image capturing device 100d is an ultra-wide-angle image capturing device, image capturing device 100e is a wide-angle image capturing device, image capturing device 100f is an ultra-wide-angle image capturing device, and image capturing device 100g is a time-of-flight ranging image capturing device. In this embodiment, image capturing devices 100 and 100d have different viewing angles, allowing the electronic device 300 to provide different magnifications to achieve optical zoom shooting effects. Additionally, image capturing device 100g can acquire depth information of the image. The above-described electronic device 300 is exemplified by including multiple image capturing devices 100, 100d, 100e, 100f, and 100g, but the number and configuration of the image capturing devices are not intended to limit this disclosure.

[0388] When the user photographs the subject 306, the electronic device 300 uses the image capturing device 100 or image capturing device 100d to capture the image, activates the flash module 301 for supplemental lighting, and uses the subject distance information of the subject 306 provided by the focus assist module 302 for fast focusing. Furthermore, the image signal processor 303 performs image optimization processing to further improve the image quality produced by the imaging 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 devices 100e, 100f, or 100g for shooting. The display module 304 can use a touch screen, combined with the diverse functions of the image software processor 305 for image capturing 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.

[0389] <Sixteenth Embodiment>

[0390] Please refer to Figure 31 This is a perspective view illustrating one side of an electronic device according to the sixteenth embodiment of this disclosure.

[0391] In this embodiment, the electronic device 400 is a smartphone. The electronic device 400 includes, according to the thirteenth embodiment, an image capturing device 100, an image capturing device 100h, an image capturing device 100i, a flash module 401, a focus assist module, an image signal processor, a display module, and an image software processor (not shown). The image capturing devices 100, 100h, and 100i are all disposed on the same side of the electronic device 400, while the display module is disposed on the other side. Furthermore, both the image capturing devices 100h and 100i may include the image capturing optical system disclosed herein and may have a structural configuration similar to that of the image capturing device 100, which will not be described in detail here.

[0392] Image capturing device 100 is a wide-angle image capturing device, image capturing device 100h is a telephoto image capturing device, and image capturing device 100i is an ultra-wide-angle image capturing device. In this embodiment, image capturing devices 100, 100h, and 100i have different viewing angles, allowing the electronic device 400 to provide different magnifications to achieve optical zoom shooting effects. Furthermore, image capturing device 100h is a telephoto image capturing device with an optical path deflection element configuration, so that the total length of image capturing device 100h is not limited by the thickness of the electronic device 400. The optical path deflection element configuration of image capturing device 100h can, for example, have a similar... Figures 36 to 38 The structure can be referred to the aforementioned corresponding structure. Figures 36 to 38The description of the above-described electronic device 400 is given as an example, which includes multiple image capturing devices 100, 100h, and 100i, but the number and configuration of the image capturing devices are not intended to limit this disclosure. When a user photographs a subject, the electronic device 400 uses the image capturing device 100, image capturing device 100h, or image capturing device 100i to focus the light and capture the image, activates the flash module 401 to provide supplementary lighting, and performs subsequent processing in a manner similar to the aforementioned embodiments, which will not be described in detail here.

[0393] <Seventeenth Embodiment>

[0394] Please refer to Figure 32 This is a perspective view illustrating one side of an electronic device according to the seventeenth embodiment of this disclosure.

[0395] In this embodiment, the electronic device 500 is a smartphone. The electronic device 500 includes, according to the thirteenth embodiment, image capturing devices 100, 100j, 100k, 100m, 100n, 100p, 100q, 100r, and 100s, a flash module 501, a focus assist module, an image signal processor, a display module, and an image software processor (not shown). Image capturing devices 100, 100j, 100k, 100m, 100n, 100p, 100q, 100r, and 100s are all located on the same side of the electronic device 500, while the display module is located on the other side of the electronic device 500. Furthermore, the imaging devices 100j, 100k, 100m, 100n, 100p, 100q, 100r, and 100s can all include the imaging optical system disclosed herein and can all have a structural configuration similar to that of the imaging device 100, which will not be described in detail here.

[0396] Image capturing device 100 is a wide-angle image capturing device, image capturing device 100j is a telephoto image capturing device, image capturing device 100k is a telephoto image capturing device, image capturing device 100m is a wide-angle image capturing device, image capturing device 100n is an ultra-wide-angle image capturing device, image capturing device 100p is an ultra-wide-angle image capturing device, image capturing device 100q is a telephoto image capturing device, image capturing device 100r is a telephoto image capturing device, and image capturing device 100s is a time-of-flight ranging image capturing device. In this embodiment, image capturing devices 100, 100j, 100k, 100m, 100n, 100p, 100q, and 100r have different viewing angles, allowing the electronic device 500 to provide different magnifications to achieve an optical zoom shooting effect. Furthermore, the image capturing devices 100j and 100k can be telescopic image capturing devices configured with optical path deflection elements. The optical path deflection element configuration of the image capturing devices 100j and 100k can, for example, have similar... Figures 36 to 38 The structure can be referred to the aforementioned corresponding structure. Figures 36 to 38 The description of the image acquisition device 100s will not be repeated here. Additionally, the image acquisition device 100s can acquire depth information of the image. The electronic device 500 described above is exemplified by including multiple image acquisition devices 100, 100j, 100k, 100m, 100n, 100p, 100q, 100r, and 100s, but the number and configuration of the image acquisition devices are not intended to limit this disclosure. When a user photographs a subject, the electronic device 500 uses image acquisition devices 100, 100j, 100k, 100m, 100n, 100p, 100q, 100r, or 100s to focus light and acquire an image, activates the flash module 501 for supplemental lighting, and performs subsequent processing in a manner similar to the aforementioned embodiments, which will not be repeated here.

[0397] <Eighteenth Embodiment>

[0398] Please refer to Figure 33 This is a perspective view illustrating one side of an electronic device according to the eighteenth embodiment of this disclosure.

[0399] In this embodiment, the electronic device 600 is a small-sized camera, such as an action camera. The electronic device 600 includes a screen 601 and an image-capturing device 602. The image-capturing device 602 is electrically connected to the screen 601. The image-capturing device 602 includes the image-capturing optical system described in the first embodiment. The image-capturing device 602 may be a wide-angle image-capturing device. Similar to the image-capturing device 100, the image-capturing device 602 may further include a lens barrel, a support device, or a combination thereof. The electronic device 600 utilizes the image-capturing device 602 to perform functions such as taking pictures. Preferably, the electronic device may further include a control unit, a display unit, a storage unit, random access memory (RAM), or a combination thereof.

[0400] The image capturing device disclosed herein is not limited to smartphones. It can also be applied to mobile focusing systems as needed, offering excellent aberration correction and good image quality. For example, the image capturing device can be used in a wide range of electronic devices, including 3D image capture, digital cameras, mobile devices, tablets, smart TVs, network monitoring equipment, dashcams, reversing 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.

[0401] Although this disclosure is presented above with reference to the preferred embodiments described above, it is not intended to limit this disclosure. Any person 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 appended to this specification.

Claims

1. An image-capturing optical system, characterized in that, It includes seven lenses. Along the optical path from the object side to the image side, the seven lenses are, in sequence, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens. And each of the seven lenses has an object-side surface facing the object side direction and an image-side surface facing the image side direction; Among them, the third lens has a negative refractive power, the object-side surface of the fifth lens is concave near the optical axis, the sixth lens has a positive refractive power, the seventh lens has a negative refractive power, the object-side surface of the seventh lens is convex near the optical axis, the image-side surface of the seventh lens is concave near the optical axis, and the image-side surface of the seventh lens has at least one inflection point; Among them, the distance from the object-side surface of the first lens to an imaging plane on the optical axis is TL, 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 spacing distance between the first lens and the second lens on the optical axis is T12, the spacing distance between the second lens and the third lens on the optical axis is T23, the spacing distance between the third lens and the fourth lens on the optical axis is T34, the spacing distance between the fourth lens and the fifth lens on the optical axis is T45, the spacing distance between the fifth lens and the sixth lens on the optical axis is T56, the spacing distance between the sixth lens and the seventh lens on the optical axis is T67, and they satisfy the following conditions: -2.50 < TL / R1 < 1.00; -2.50 < TL / R3 < 1.70; and 0.00 < (T12 + T23 + T56 + T67) / (T34 + T45) < 0.

70.

2. The imaging optical system according to claim 1, characterized in that, The fourth lens has a positive refractive power, and the fifth lens has a negative refractive power.

3. The imaging optical system according to claim 1, characterized in that, The total thickness of all the lenses in the imaging optical system on the optical axis is ΣCT, and the total sum of the spacing distances between all adjacent lenses in the imaging optical system on the optical axis is ΣAT, and they satisfy the following conditions: 3.00 < ΣCT / ΣAT < 6.

50.

4. The imaging optical system according to claim 1, characterized in that, The focal length of the imaging optical system is f, the radius of curvature of the object-side surface of the fifth lens is R9, and the radius of curvature of the image-side surface of the fifth lens is R10, and they satisfy the following conditions: 4.00 < |f / R9| + |f / R10| < 8.

00.

5. The imaging optical system according to claim 1, characterized in that, The radius of curvature of the image-side surface of the fifth lens is R10, and the radius of curvature of the object-side surface of the sixth lens is R11, and they satisfy the following conditions: -0.70 < R10 / R11 < 0.

30.

6. The imaging optical system according to claim 1, characterized in that, It further includes an aperture. Among them, the distance from the aperture to the imaging plane on the optical axis is SL, and the focal length of the imaging optical system is f, and they satisfy the following conditions: 1.40 < SL / f < 2.

00.

7. The imaging optical system according to claim 1, characterized in that, The spacing distance between the fourth lens and the fifth lens on the optical axis is T45, the spacing distance between the sixth lens and the seventh lens on the optical axis is T67, the focal length of the sixth lens is f6, and the focal length of the seventh lens is f7, and they satisfy the following conditions: 0.00 < T67 / T45 < 0.60; and 0.20 < |f6 / f7| < 0.

90.

8. The imaging optical system according to claim 1, characterized in that, The focal length of the fifth lens is f5, and the focal length of the sixth lens is f6, which satisfy the following conditions: 0.70 < |f5 / f6| < 1.

80.

9. An image capturing device, characterized in that, Comprising: The imaging optical system according to claim 1; and An electronic photosensitive element disposed on the imaging surface of the imaging optical system.

10. An electronic device, characterized in that, Comprising: The imaging device according to claim 9.

11. An image-capturing optical system, characterized in that, Comprising seven lenses, which are, in order from the object side to the image side along the optical path, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, and each of the seven lenses has an object-side surface facing the object side and an image-side surface facing the image side; Wherein, the image-side surface of the second lens is convex near the optical axis, the third lens has a negative refractive power, the fifth lens has a negative refractive power, the object-side surface of the fifth lens is concave near the optical axis, the image-side surface of the fifth lens is convex near the optical axis, the seventh lens has a negative refractive power, and the image-side surface of the seventh lens has at least one inflection point; Wherein, the distance from the object-side surface of the first lens to an imaging surface on the optical axis is TL, 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 focal length of the sixth lens is f6, the focal length of the seventh lens is f7, the distance between the fourth lens and the fifth lens on the optical axis is T45, and the distance between the sixth lens and the seventh lens on the optical axis is T67, which satisfy the following conditions: -2.20 < TL / R1 < 1.00; -2.50 < TL / R3 < 2.00; 0.00 < |f6 / f7| < 1.00; and 0.00 < T67 / T45 < 0.

80.

12. The imaging optical system according to claim 11, characterized in that, The fourth lens has a positive refractive power, the sixth lens has a positive refractive power, the image-side surface of the seventh lens is concave near the optical axis, and the image-side surface of the seventh lens has at least one critical point at the off-axis position; Wherein, the distance from the object-side surface of the first lens to the imaging surface on the optical axis is TL, the focal length of the imaging optical system is f, and half of the maximum viewing angle in the imaging optical system is HFOV, which satisfy the following conditions: 1.60 < TL / f < 2.10; and 0.70 < tan(HFOV) < 1.

40.

13. The imaging optical system according to claim 11, characterized in that, The focal length of the fourth lens is f4, and the focal length of the seventh lens is f7, which satisfy the following conditions: 0.40 < |f4 / f7| < 1.

40.

14. The imaging optical system according to claim 11, characterized in that, The radius of curvature of the object-side surface of the second lens is R3, and the radius of curvature of the image-side surface of the second lens is R4, which satisfy the following conditions: -0.50 < (R3 - R4) / (R3 + R4).

15. The imaging optical system according to claim 11, characterized in that, The distance from the object-side surface of the first lens to the imaging surface on the optical axis is TL, 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 satisfy the following conditions: -2.10 < TL / R1 < 0.80; and -2.30 < TL / R3 < 1.

90.

16. The imaging optical system according to claim 11, characterized in that, The thickness of the second lens along the optical axis is CT2, and the thickness of the sixth lens along the optical axis is CT6, satisfying the following conditions: 0.30 <CT6 / CT2<1.25。 17. The imaging optical system according to claim 11, characterized in that, The optical axis spacing between the first lens and the second lens is T12, the optical axis spacing between the second lens and the third lens is T23, the optical axis spacing between the third lens and the fourth lens is T34, the optical axis spacing between the fourth lens and the fifth lens is T45, the optical axis spacing between the fifth lens and the sixth lens is T56, and the optical axis spacing between the sixth lens and the seventh lens is T67, satisfying the following conditions: 0.00<(T12+T23+T56+T67) / (T34+T45)<0.

60.

18. The imaging optical system according to claim 11, characterized in that, The Abbe number of the fourth lens is V4, which satisfies the following condition: 35.0<V4<75.0。 19. An image-capturing optical system, characterized in that, It comprises seven lenses, which are arranged sequentially from the object side to the image side along the light path as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, and each of the seven lenses has an object-side surface facing the object side and an image-side surface facing the image side. Wherein, the object-side surface of the first lens is concave near the optical axis, the object-side surface of the second lens is concave near the optical axis, the third lens has negative refractive power, the object-side surface of the fifth lens is concave near the optical axis, the image-side surface of the fifth lens is convex near the optical axis, the sixth lens has positive refractive power, and the image-side surface of the seventh lens has at least one inflection point; Wherein, the distance from the object-side surface of the first lens to an imaging plane on the optical axis is TL, 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 satisfies the following conditions: TL / R1 < 0.00; and TL / R3 < 0.

00.

20. The imaging optical system according to claim 19, characterized in that, The fourth lens has positive refractive power, the fifth lens has negative refractive power, the sixth lens has positive refractive power, the seventh lens has negative refractive power, and the image-side surface of the seventh lens is concave near the optical axis.

21. The imaging optical system according to claim 19, characterized in that, The image-side surface of the first lens is convex near the optical axis, the image-side surface of the second lens is convex near the optical axis, the image-side surface of the third lens is concave near the optical axis, the image-side surface of the fourth lens is convex near the optical axis, and the image-side surface of the sixth lens is convex near the optical axis.

22. The imaging optical system according to claim 19, characterized in that, The distance from the object-side surface of the first lens to the imaging surface along the optical axis is TL, and the maximum imaging height of the imaging optical system is ImgH, which satisfies the following conditions: 1.50 <TL / ImgH<2.10。 23. The imaging optical system according to claim 19, characterized in that, The focal length of the imaging optical system is f, the focal length of the first lens is f1, and the focal length of the second lens is f2, which satisfy the following conditions: 0.50 <f / f1+f / f2<3.00。 24. The imaging optical system according to claim 19, characterized in that, The radius of curvature of the image-side surface of the third lens is R6, and the radius of curvature of the object-side surface of the fourth lens is R7, satisfying the following conditions: -0.40 <R6 / R7<0.55。 25. The imaging optical system according to claim 19, characterized in that, The distance between the third lens and the fourth lens on the optical axis is T34, and the distance between the fourth lens and the fifth lens on the optical axis is T45, which satisfies the following condition: 0.50 <T34 / T45<1.80。 26. The imaging optical system according to claim 19, characterized in that, The maximum effective radius of the object-side surface of the second lens is Y2R1, and the maximum effective radius of the image-side surface of the seventh lens is Y7R2, which satisfy the following conditions: 2.20 <Y7R2 / Y2R1<5.00。 27. The imaging optical system according to claim 19, characterized in that, The distance from the object-side surface of the first lens to the imaging plane on the optical axis is TL; 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 focal length of the sixth lens is f6; the focal length of the seventh lens is f7; the optical axis spacing between the first and second lenses is T12; the optical axis spacing between the second and third lenses is T23; the optical axis spacing between the third and fourth lenses is T34; the optical axis spacing between the fourth and fifth lenses is T45; the optical axis spacing between the fifth and sixth lenses is T56; and the optical axis spacing between the sixth and seventh lenses is T67. These conditions must be met. -1.95≤TL / R1≤0.61; -2.14≤TL / R3≤1.58; 0.36≤|f6 / f7|≤0.83; 0.13≤(T12+T23+T56+T67) / (T34+T45)≤0.49; and 0.06≤T67 / T45≤0.42.

Images