Imaging optical system lens, image capturing device and electronic device

Abstract

An imaging optical system lens, an image capturing device and an electronic device are disclosed. The imaging optical system lens includes seven lenses, which are sequentially arranged 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. Each of the first lens to the seventh lens includes an object side surface facing the object side direction and an image side surface facing the image side direction. The first lens has a negative refractive power, the object side surface of the first lens is concave at a vicinity of an optical axis, and the image side surface of the first lens is convex at the vicinity of the optical axis. The object side surface of the second lens is convex at the vicinity of the optical axis. When certain conditions are met, the miniaturization of the imaging optical system lens is facilitated, and good imaging quality is provided.

Description

Technical Field

[0001] This invention relates to an imaging optical system lens assembly and an image acquisition device, and more particularly to an imaging optical system lens assembly and an image acquisition device applicable to 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] As technology advances rapidly, electronic devices equipped with optical lenses are being used in a wider range of applications, and the requirements for optical lenses are becoming more diverse. Since traditional optical lenses are not easy to balance between requirements such as image quality, sensitivity, aperture size, size, or viewing angle, this invention provides an optical lens to meet these requirements. Summary of the Invention

[0004] This invention provides an imaging optical system lens assembly comprising seven lenses, which are sequentially arranged from the object side to the image side of 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 first to seventh lenses includes an object-side surface facing the object side and an image-side surface facing the image side. The first lens has negative refractive power, and the object-side surface of the first lens is concave near the optical axis and the image-side surface of the first lens is convex near the optical axis. The object-side surface of the second lens is also convex near the optical axis.

[0005] In this imaging optical system, the focal length of the lens group is f, the focal length of the first lens is f1, the combined focal length of the sixth and seventh lenses is f67, the object-side radius of curvature of the first lens is R1, the image-side radius of curvature of the first lens is R2, the object-side radius of curvature of the third lens is R5, the image-side radius of curvature of the third lens is R6, the image-side radius of curvature of the sixth lens is R12, the object-side radius of curvature of the seventh lens is R13, and the image-side radius of curvature of the seventh lens is R14. These components satisfy the following relationship:

[0006] -2.50 <f / f1<-0.25;

[0007] 0.00 <f / f67<2.50;

[0008] 0.12 <R1 / R2;

[0009] (R5+R6) / (R5-R6)<1.20;

[0010] 0.10 < (R12 + R13) / (R12 - R13) < 5.00; and

[0011] -1.55<(R13-R14) / (R13+R14).

[0012] The present invention provides an image capturing apparatus, comprising the aforementioned imaging optical system lens assembly and an electronic photosensitive element.

[0013] The present invention provides an electronic device, comprising the aforementioned image capturing apparatus.

[0014] The present invention provides an imaging optical system lens assembly, comprising seven lenses, the seven lenses being, in order from an object side to an image side of an optical path, 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 first lens to the seventh lens comprising an object side surface facing the object side direction and an image side surface facing the image side direction; wherein the first lens has negative refractive power, the object side surface of the first lens is a concave surface at a paraxial region, the image side surface of the first lens is a convex surface at the paraxial region, and the image side surface of the seventh lens has at least one inflection point.

[0015] Wherein a focal length of the imaging optical system lens assembly is f, a combined focal length of the first lens and the second lens is f12, a focal length of the fifth lens is f5, a curvature radius of the image side surface of the sixth lens is R12, a curvature radius of the object side surface of the first lens is R1, a curvature radius of the image side surface of the first lens is R2, which satisfies the following relational expressions:

[0016] -2.50<f / f12<-0.10;

[0017] -0.70<f / f5<2.50;

[0018] -2.40<f / R1<-0.65;

[0019] -1.50<f / R12<-0.10; and

[0020] 0.16<R1 / R2<1.00.

[0021] The present invention provides an imaging optical system lens assembly, comprising seven lenses, the seven lenses being, in order from an object side to an image side of an optical path, 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 first lens to the seventh lens comprising an object side surface facing the object side direction and an image side surface facing the image side direction; wherein the first lens has negative refractive power, the object side surface of the first lens is a concave surface at a paraxial region, the image side surface of the first lens is a convex surface at the paraxial region, the image side surface of the sixth lens is a convex surface at the paraxial region, and the image side surface of the seventh lens has at least one inflection point.

[0022] where the focal length of the imaging optical system lens group is f, the focal length of the fifth lens is f5, the focal length of the seventh lens is f7, the curvature radius of the object-side surface of the first lens is R1, the curvature radius of the image-side surface of the first lens is R2, and the curvature radius of the object-side surface of the seventh lens is R13, which satisfy the following relational expressions:

[0023] -0.57<f / f5<2.50;

[0024] -0.25<f / f7<2.50;

[0025] 0.12<R1 / R2<0.80; and

[0026] 0.50<f / R13<3.50.

[0027] When f / f1 satisfies the condition, the refractive power of the first lens can be adjusted, which helps reduce the spot size in the central field of view.

[0028] When f / f67 satisfies the condition, the overall refractive power from the sixth lens to the seventh lens can be adjusted, which can reduce astigmatism aberration in the central field of view and the adjacent field of view.

[0029] When R1 / R2 satisfies the condition, the ratio of the central curvature radii of the object-side surface and the image-side surface of the first lens can be adjusted, which helps reduce the effective diameter of the first lens, so as to reduce the proportion of the aperture of the optical imaging system lens group occupying on the screen of the electronic device.

[0030] When (R5+R6) / (R5-R6) satisfies the condition, the surface shape and refractive power of the third lens can be adjusted, which helps reduce distortion aberration.

[0031] When (R12+R13) / (R12-R13) satisfies the condition, the surface shape of the image-side surface of the sixth lens and the surface shape of the object-side surface of the seventh lens can be adjusted, which helps improve the light condensing quality of the central and adjacent fields of view.

[0032] When (R13-R14) / (R13+R14) satisfies the condition, the surface shape and refractive power of the seventh lens can be adjusted, which helps reduce the back focal length.

[0033] When f / f12 satisfies the condition, the overall refractive power from the first lens to the second lens can be adjusted, which helps receive light with a large viewing angle and reduce the total length of the imaging optical system lens group.

[0034] When f / f5 satisfies the condition, the refractive power of the fifth lens can be adjusted, which can cooperate with the sixth lens to reduce the volume of the fifth lens and the sixth lens.

[0035] When f / R1 satisfies the condition, the ratio of the focal length to the central curvature radius of the object-side surface of the first lens can be adjusted, which helps increase the viewing angle and reduce the effective diameter of the first lens.

[0036] When f / R12 is met, the ratio of the focal length to the radius of curvature of the center of the image side of the sixth lens can be adjusted, which helps to increase the central light-gathering quality and reduce the back focal length.

[0037] When f / f7 meets the condition, the refractive power of the seventh lens can be adjusted, which can reduce the back focal length.

[0038] When f / R13 meets the condition, the ratio of the focal length to the radius of curvature of the center of the object side of the seventh lens can be adjusted, which helps to compress volume and correct field curvature aberration. Attached Figure Description

[0039] Figure 1A This is a schematic diagram of the imaging device according to the first embodiment of the present invention.

[0040] Figure 1B This is an aberration curve diagram of the first embodiment of the present invention.

[0041] Figure 2A This is a schematic diagram of the imaging device according to the second embodiment of the present invention.

[0042] Figure 2B This is an aberration curve diagram of the second embodiment of the present invention.

[0043] Figure 3A This is a schematic diagram of the imaging device according to the third embodiment of the present invention.

[0044] Figure 3B This is an aberration curve diagram of the third embodiment of the present invention.

[0045] Figure 4A This is a schematic diagram of the imaging device according to the fourth embodiment of the present invention.

[0046] Figure 4B This is an aberration curve diagram of the fourth embodiment of the present invention.

[0047] Figure 5A This is a schematic diagram of the imaging device according to the fifth embodiment of the present invention.

[0048] Figure 5B This is a graph of the fifth embodiment of the present invention.

[0049] Figure 6A This is a schematic diagram of the imaging device according to the sixth embodiment of the present invention.

[0050] Figure 6B This is an aberration curve diagram of the sixth embodiment of the present invention.

[0051] Figure 7 This is a schematic diagram illustrating the critical point and inflection point on the lens surface of the lens group of the imaging optical system, using the first embodiment of the present invention as an example.

[0052] Figure 8 This is a three-dimensional schematic diagram of the imaging device according to the seventh embodiment of the present invention.

[0053] Figure 9A This is a front view of the electronic device according to the eighth embodiment of the present invention.

[0054] Figure 9B This is a rear view of the electronic device according to the eighth embodiment of the present invention.

[0055] Figure 10 This is a rear view of the electronic device according to the ninth embodiment of the present invention.

[0056] Figure 11 This is a rear view of the electronic device according to the tenth embodiment of the present invention.

[0057] Figure 12A This is a front view of the electronic device according to the eleventh embodiment of the present invention.

[0058] Figure 12B This is a rear view of the electronic device according to the eleventh embodiment of the present invention.

[0059] Figure Labels

[0060] Imaging optical system lens groups 1, 2, 3, 4, 5, 6

[0061] First lens E1

[0062] Second lens E2

[0063] Third lens E3

[0064] Fourth lens E4

[0065] Fifth lens E5

[0066] Sixth lens E6

[0067] Seventh Lens E7

[0068] Filter element E8

[0069] Aperture ST

[0070] Light stops S1, S2

[0071] Imaging plane IMG

[0072] Electronic photosensitive element IS

[0073] Electronic devices 200, 300, 400, 500

[0074] Image capturing devices 100, 202, 203, 234, 236, 332, 334, 336, 404a, 404b, 405a, 405b, 406a, 406b, 409a, 409b

[0075] Photographic Optical Lens System 101

[0076] Drive unit 102

[0077] Electronic photosensitive element 103

[0078] TOF module 201, 407

[0079] Display devices 210, 510

[0080] Flash modules 240, 340, 408

[0081] Telescope lens 530

[0082] 540 wide-angle lens

[0083] 550mm ultra-wide-angle lens

[0084] The radius of curvature of the first lens objective side surface is R1

[0085] The radius of curvature of the image side surface of the first lens is R2

[0086] The third lens has a surface curvature radius of R5.

[0087] The radius of curvature of the side surface of the third lens is R6.

[0088] The radius of curvature of the side surface of the sixth lens is R12.

[0089] The radius of curvature of the object side of the seventh lens is R13.

[0090] The radius of curvature of the side surface of the seventh lens is R14

[0091] The distance TD on the optical axis between the object side of the first lens and the image side of the seventh lens is...

[0092] The focal length f of the imaging optical system lens group

[0093] The focal length of the first lens is f1

[0094] The second lens has a focal length of f2.

[0095] The fifth lens has a focal length of f5.

[0096] The seventh lens has a focal length of f7.

[0097] The combined focal length f12 of the first lens and the second lens

[0098] The combined focal length of the sixth and seventh lenses is f67.

[0099] The combined focal length of the first, second, third, and fourth lenses is f1234.

[0100] The combined focal length of the third, fourth, and fifth lenses is f345.

[0101] The combined focal length of the fifth, sixth, and seventh lenses is f567.

[0102] The distance SL between the aperture and the image plane on the optical axis

[0103] The distance TL between the object side of the first lens and the imaging plane on the optical axis is TL

[0104] The maximum distance on the optical axis between two adjacent lenses in an imaging optical system.

[0105] The sum of the distances along the optical axis between all two adjacent lenses in an imaging optical system lens group, ΣAT

[0106] The thickness of the first lens along the optical path on the optical axis is CT1.

[0107] The optical axis distance T12 between the first lens and the second lens

[0108] The optical axis distance T45 between the fourth and fifth lenses

[0109] The optical axis distance T56 between the fifth and sixth lenses

[0110] The optical axis distance T67 between the sixth and seventh lenses

[0111] The refractive index of the second lens is N2

[0112] The refractive index of the third lens is N3

[0113] Imaging optical system lens group aperture value FNO Detailed Implementation

[0114] The present invention provides an imaging optical system lens assembly comprising seven lenses, which are arranged in sequence from the object side to the image side of 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 first lens to the seventh lens includes an object-side surface facing the object side and an image-side surface facing the image side.

[0115] The first lens has negative refractive power, which helps to reduce the volume of the first and second lenses in the imaging optical system.

[0116] The object-side surface of the first lens is concave at the paraxial region, and the surface profile of the first lens can be adjusted, which helps reduce the effective diameter of the first lens and the total length of the entire lens. The image-side surface of the first lens is convex at the paraxial region, and the surface profile of the first lens can be adjusted, which helps correct aberrations such as astigmatism. The object-side surface of the first lens includes at least one critical point, which helps reduce field curvature aberration in the peripheral field of view.

[0117] The object-side surface of the second lens is convex at the paraxial region, which can adjust the traveling direction of light rays and help increase the image plane.

[0118] The image-side surface of the sixth lens is convex at the paraxial region, and the surface profile of the image-side surface of the sixth lens can be adjusted, which helps reduce the back focal length.

[0119] The image-side surface of the seventh lens has at least one inflection point, which can adjust the incident angle of light rays on the image plane and help reduce the influence of assembly errors on the spot size in the peripheral field of view. The image-side surface of the seventh lens includes at least one critical point, which helps reduce field curvature aberration in the peripheral field of view.

[0120] The focal length of the lens group of the imaging optical system is f, and the focal length of the first lens is f1. When the lens group of the imaging optical system satisfies the following relational expression: -2.50<f / f1<-0.25, the refractive power of the first lens can be adjusted, which helps reduce the spot size in the central field of view. Here, the following can also be satisfied: -1.20<f / f1<-0.38. Here, the following can also be satisfied: -0.82<f / f1<-0.30.

[0121] The focal length of the lens group of the imaging optical system is f, and the combined focal length of the sixth lens and the seventh lens is f67. When the lens group of the imaging optical system satisfies the following relational expression: 0.00<f / f67<2.50, the overall refractive power from the sixth lens to the seventh lens can be adjusted, which can reduce astigmatism aberration in the central field of view and the adjacent field of view. Here, the following can also be satisfied: 0.25<f / f67<1.50. Here, the following can also be satisfied: 0.25<f / f67<0.90. Here, the following can also be satisfied: 0.30<f / f67<0.75.

[0122] The curvature radius of the object-side surface of the first lens is R1, and the curvature radius of the image-side surface of the first lens is R2. When the lens group of the imaging optical system satisfies the following relational expression: 0.12<R1 / R2, the ratio of the central curvature radii of the object-side surface and the image-side surface of the first lens can be adjusted, which helps reduce the effective diameter of the first lens, so as to reduce the proportion of the aperture of the lens group of the optical imaging system on the screen of the electronic device. Here, the following can also be satisfied: 0.16<R1 / R2<1.00. Here, the following can also be satisfied: 0.18<R1 / R2<0.80. Here, the following can also be satisfied: 0.12<R1 / R2<0.80.

[0123] The radius of curvature of the object-side surface of the third lens is R5, and the radius of curvature of the image-side surface of the third lens is R6. When the lens group of the imaging optical system satisfies the following relational expression: (R5+R6) / (R5-R6)<1.20, the surface shape and refractive power of the third lens can be adjusted, which helps reduce distortion aberration. Herein, it may also satisfy: -6.00<(R5+R6) / (R5-R6)<0.50. Herein, it may also satisfy: -7.50<(R5+R6) / (R5-R6)<0.45.

[0124] The radius of curvature of the image-side surface of the sixth lens is R12, and the radius of curvature of the object-side surface of the seventh lens is R13. When the lens group of the imaging optical system satisfies the following relational expression: 0.10<(R12+R13) / (R12-R13)<5.00, the surface shape of the image-side surface of the sixth lens and the surface shape of the object-side surface of the seventh lens can be adjusted, which helps improve the light-gathering quality of the central and adjacent fields of view. Herein, it may also satisfy: 0.10<(R12+R13) / (R12-R13)<3.00. Herein, it may also satisfy: 0.10<(R12+R13) / (R12-R13)<1.50.

[0125] The radius of curvature of the object-side surface of the seventh lens is R13, and the radius of curvature of the image-side surface of the seventh lens is R14. When the lens group of the imaging optical system satisfies the following relational expression: -1.55<(R13-R14) / (R13+R14), the surface shape and refractive power of the seventh lens can be adjusted, which helps reduce the back focal length. Herein, it may also satisfy: -0.50<(R13-R14) / (R13+R14)<1.00. Herein, it may also satisfy: -0.30<(R13-R14) / (R13+R14)<0.5.

[0126] The focal length of the lens group of the imaging optical system is f, and the radius of curvature of the object-side surface of the first lens is R1. When the lens group of the imaging optical system satisfies the following relational expression: -2.40<f / R1<-0.65, the ratio of the focal length to the central radius of curvature of the object-side surface of the first lens can be adjusted, which helps increase the field of view and reduce the effective diameter of the first lens. Herein, it may also satisfy: -2.00<f / R1<-0.75. Herein, it may also satisfy: -1.75<f / R1<-1.15. Herein, it may also satisfy: -1.75<f / R1<-1.10.

[0127] The lens group of the imaging optical system further includes an aperture stop, the distance on the optical axis between the aperture stop and the imaging surface is SL, and the distance on the optical axis between the object-side surface of the first lens and the imaging surface is TL. When the lens group of the imaging optical system satisfies the following relational expression: 0.52<SL / TL<0.81, the ratio of the total length of the lens group of the optical imaging system to the distance from the aperture stop to the image plane can be adjusted, which helps reduce the volume of the lens group of the optical imaging system and increase the relative illumination of the peripheral field of view.

[0128] The focal length of the lens group of the imaging optical system is f, and the combined focal length of the first lens, the second lens, the third lens and the fourth lens is f1234. When the lens group of the imaging optical system satisfies the following relational expression: -0.25<f / f1234<0.82, the overall refractive power from the first lens to the fourth lens can be adjusted, which helps reduce the spherical aberration in the central field of view. Here, it can also satisfy: 0.25<f / f1234<0.75. Here, it can also satisfy: 0.25<f / f1234<1.50. Here, it can also satisfy: 0.25<f / f1234<1.20.

[0129] The maximum value of the separation distance on the optical axis between two adjacent lenses in the lens group of the imaging optical system is MaxAT, and the sum of the separation distances on the optical axis between all two adjacent lenses in the lens group of the imaging optical system is ΣAT. When the lens group of the imaging optical system satisfies the following relational expression: 0.17<MaxAT / ΣAT<0.40, the ratio of the maximum lens separation distance of the lens group to the sum of all lens separation distances of the lens group can be adjusted, which helps balance the distribution of the lenses and reduce assembly errors.

[0130] The focal length of the lens group of the imaging optical system is f, and the focal length of the second lens is f2. When the lens group of the imaging optical system satisfies the following relational expression: -0.60<f / f2<0.70, the refractive power of the second lens can be adjusted, which can cooperate with the first lens and help reduce the effective diameter sizes of the first lens and the second lens. Here, it can also satisfy: -0.30<f / f2<0.35.

[0131] The thickness of the first lens along the optical path on the optical axis is CT1, the distance on the optical axis between the first lens and the second lens is T12, and the focal length of the lens group of the imaging optical system is f. When the lens group of the imaging optical system satisfies the following relational expression: 0.25<(CT1+T12) / f<0.50, the ratio of the focal length to the distance from the object side of the first lens to the object side of the second lens can be adjusted, which helps configure the position of the first lens and increase the size of the field of view.

[0132] The focal length of the lens group of the imaging optical system is f, and the combined focal length of the first lens and the second lens is f12. When the lens group of the imaging optical system satisfies the following relational expression: -2.50<f / f12<-0.10, the overall refractive power from the first lens to the second lens can be adjusted, which helps receive light with a large field of view and reduce the total length of the lens group of the imaging optical system. Here, it can also satisfy: -1.00<f / f12<-0.10.

[0133] The focal length of the imaging optical system lens group is f, and the focal length of the fifth lens is f5. When the imaging optical system lens group satisfies the following relational expression: -0.70<f / f5<2.50, the refractive power of the fifth lens can be adjusted to cooperate with the sixth lens, so as to reduce the volume of the fifth lens and the sixth lens. Here, it may also satisfy: -0.50<f / f5<1.00. Here, it may also satisfy -0.60<f / f5<0.60. Here, it may also satisfy: -0.50<f / f5<1.00. Here, it may also satisfy: -0.57<f / f5<2.50. Here, it may also satisfy: -0.57<f / f5<1.00.

[0134] The focal length of the imaging optical system lens group is f, and the radius of curvature of the image side surface of the sixth lens is R12. When the imaging optical system lens group satisfies the following relational expression: -1.50<f / R12<-0.10, the ratio of the focal length to the central radius of curvature of the image side surface of the sixth lens can be adjusted, which helps to improve the central light-converging quality and reduce the back focal length. Here, it may also satisfy: -1.50<f / R12<-0.50. Here, it may also satisfy: -1.40<f / R12<-0.40.

[0135] The focal length of the imaging optical system lens group is f, and the combined focal length of the third lens, the fourth lens and the fifth lens is f345. When the imaging optical system lens group satisfies the following relational expression: -0.20<f / f345<1.00, the overall refractive power from the third lens to the fifth lens can be adjusted, which helps to balance the refractive power of the entire lenses and reduce the eccentric sensitivity of each lens. Here, it may also satisfy: 0.15<f / f345<0.90. Here, it may also satisfy: 0.30<f / f345<1.00.

[0136] The distance on the optical axis between the fourth lens and the fifth lens is T45, the distance on the optical axis between the fifth lens and the sixth lens is T56, the distance on the optical axis between the sixth lens and the seventh lens is T67, and the total sum of the spacing distances on the optical axis between every two adjacent lenses in the imaging optical system lens group is ΣAT. When the imaging optical system lens group satisfies the following relational expression: 0.00<(T45+T56+T67) / ΣAT<0.49, the ratio of the sum of the lens spacing from the fourth lens to the seventh lens to the sum of the lens spacing from the first lens to the seventh lens can be adjusted, which helps to allocate the positions of the fourth lens to the seventh lens and reduce the total length of the imaging optical system lens group. Here, it may also satisfy: 0.20<(T45+T56+T67) / ΣAT<0.40.

[0137] The refractive index of the second lens is N2. When the imaging optical system lens group satisfies the following relational expression: 1.63<N2<1.95, the refractive index of the second lens can be adjusted, which helps to reduce the overall volume of the lens group.

[0138] The distance on the optical axis between the object side of the first lens and the image side of the seventh lens is TD, and the distance on the optical axis between the object side of the first lens and the imaging surface is TL. When the imaging optical system lens group satisfies the following relational expression: 0.50<TD / TL<0.82, the ratio of the distance from the object side of the first lens to the image side of the seventh lens to the distance from the aperture stop to the image plane can be adjusted, which helps achieve a balance between increasing the volume utilization rate of the image capturing apparatus or the electronic apparatus and the assembly yield. Herein, it can also satisfy: 0.65<TD / TL<0.80.

[0139] The focal length of the lens of the imaging optical system is f, and the focal length of the seventh lens is f7. When the imaging optical system lens group satisfies the following relational expression: -0.25<f / f7<2.50, the refractive power of the seventh lens can be adjusted, which can reduce the back focal length. Herein, it can also satisfy: -0.25<f / f7<1.20.

[0140] The focal length of the imaging optical system lens group is f, and the curvature radius of the object side of the seventh lens is R13. When the imaging optical system lens group satisfies the following relational expression: 0.50<f / R13<3.50, the ratio of the focal length to the central curvature radius of the object side of the seventh lens can be adjusted, which helps to compress the volume and correct field curvature aberration.

[0141] The refractive index of the second lens is N2, and the refractive index of the third lens is N3. When the imaging optical system lens group satisfies the following relational expression: 1.59<(N2+N3) / 2<1.85, the average refractive index of the second lens and the third lens can be adjusted, which helps to increase the image height and reduce the size of the effective diameter of the second lens. Herein, it can also satisfy: 1.63<(N2+N3) / 2<1.82.

[0142] The aperture value of the imaging optical system lens group is FNO. When the imaging optical system lens group satisfies the following relational expression: 1.90<FNO<2.25, the aperture size can be adjusted, which helps to improve the quality of shooting in dark environments.

[0143] The focal length of the imaging optical system lens group is f, and the combined focal length of the fifth lens, the sixth lens and the seventh lens is f567. When the imaging optical system lens group satisfies the following relational expression: 0.10<f / f567<1.20, the overall refractive power from the fifth lens to the seventh lens can be adjusted, which can balance the refractive power of all lenses behind the aperture stop and reduce spherical aberration in the central field of view and adjacent fields of view. Herein, it can also satisfy: 0.20<f / f567<0.90.

[0144] The present invention provides an image capturing apparatus, comprising the aforementioned imaging optical system lens group and an electronic photosensitive element, which is disposed on the imaging surface of the imaging optical system lens group.

[0145] The present invention provides an electronic device comprising three or more imaging devices, wherein the three or more imaging devices include the aforementioned imaging devices and the three or more imaging devices face the same direction, which can meet imaging requirements such as telephoto and wide-angle imaging.

[0146] Please refer to Figure 7 As an example, the inflection point c on the lens surface of the imaging optical system of the present invention is the intersection of the positive and negative changes in the curvature of the lens surface, and the critical point d is the tangent point on the lens surface, which, in addition to the intersection with the optical axis, is tangent to a tangent plane perpendicular to the optical axis.

[0147] The various technical features in the lens assembly of the imaging optical system of the present invention can be combined and configured to achieve the corresponding effects.

[0148] In the imaging optical system lens assembly disclosed in this invention, the object side and the image side refer to the direction along the optical axis.

[0149] In the imaging optical system lens assembly disclosed in this invention, the optical elements can be made of glass or plastic. If the optical elements are made of glass, the degree of freedom in configuring the refractive power of the imaging optical system lens assembly can be increased, and the influence of external environmental temperature changes on imaging can be reduced. Glass optical elements can be manufactured using techniques such as grinding or molding. If the optical elements are made of plastic, production costs can be effectively reduced. Furthermore, spherical or aspherical surfaces (ASPs) can be provided on the mirror surface. Spherical optical elements reduce manufacturing difficulty, while aspherical surfaces provide more control variables to reduce aberrations, decrease the number of optical elements, and effectively reduce the overall length of the imaging optical system lens assembly of this invention. Aspherical surfaces can be manufactured by plastic injection molding or molding glass lenses. The optical elements of this invention can be made of cyclic olefin polymers (Cyclo olefin polymers), which can be a copolymer.

[0150] In the imaging optical system lens assembly disclosed in this invention, if the surface of the optical element is aspherical, it means that the entire or a part of the optically effective area of ​​the surface of the optical element is aspherical.

[0151] In the imaging optical system lens assembly disclosed in this invention, additives can be selectively added to any (or more) optical element materials to alter the transmittance of the optical elements for specific wavelengths of light, thereby reducing stray light and color shift. For example, the additives may have the function of filtering 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 can prevent specific wavelengths of light from interfering with imaging. Furthermore, the additives can be uniformly mixed in plastic and fabricated into optical elements using injection molding technology.

[0152] The imaging optical system lens assembly disclosed in this invention can be equipped with at least one stop, such as an aperture stop, glare stop, or field stop, which helps to reduce stray light and improve image quality.

[0153] In the imaging optical system lens assembly disclosed in this invention, the aperture configuration can be front-mounted or center-mounted. A front-mounted aperture means that the aperture is set between the subject and the first optical element, while a center-mounted aperture means that the aperture is set between the first optical element and the imaging plane. A front-mounted aperture can create a longer distance between the exit pupil of the imaging optical system lens assembly and the imaging plane, giving it a telecentric effect, which can increase the efficiency of electronic image sensors such as CCD or CMOS in receiving images. A center-mounted aperture helps to expand the field of view of the lens, giving the imaging optical system lens assembly the advantages of a wide-angle lens.

[0154] This invention may appropriately incorporate a variable aperture element, which can be a mechanical component or a light-regulating element, and whose aperture size and shape can be controlled electrically or by electrical signals. The mechanical component may include movable parts such as a blade assembly or a shielding plate; the light-regulating element may include a filter element, an electrochromic material, a liquid crystal layer, or other masking materials. This variable aperture element can enhance image adjustment capabilities by controlling the amount of light entering the image or the exposure time. Furthermore, this variable aperture element can also be the aperture of this invention, and image quality, such as depth of field or exposure speed, can be adjusted by changing the F-value.

[0155] In the imaging optical system lens assembly disclosed in this invention, if the surface of the optical element is convex and the location of the convex surface is not defined, it means that the surface of the optical element can be convex near the optical axis; if the surface of the optical element is concave and the location of the concave surface is not defined, it means that the surface of the optical element can be concave near the optical axis. If the refractive power or focal length of the optical element is not defined in its region, it means that the refractive power or focal length of the optical element can be the refractive power or focal length of the optical element near the optical axis.

[0156] In the imaging optical system lens assembly disclosed in this invention, the imaging surface of the lens assembly can be a plane or a curved surface with any curvature, depending on the corresponding electronic photosensitive element, particularly a curved surface with a concave surface facing the object side. Furthermore, one or more imaging correction elements (such as planar elements) can be selectively arranged between the optical element closest to the imaging surface and the imaging surface in the imaging optical system lens assembly of this invention to achieve the effect of correcting image curvature (e.g., image bending). The optical properties of this imaging correction element, such as curvature, thickness, refractive index, position, and surface shape (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 imaging correction element configuration is a thin plano-concave element with a concave surface facing the object side positioned close to the imaging surface.

[0157] The imaging optical system lens assembly disclosed in this invention will be described in detail with reference to the following specific embodiments and accompanying drawings.

[0158] First Embodiment

[0159] Please refer to the schematic diagram of the imaging device of the first embodiment of the present invention. Figure 1A Please refer to the aberration curves. Figure 1B The imaging device of the first embodiment includes an imaging optical system lens group 1 and an electronic photosensitive element IS. The imaging optical system lens group 1 includes, from the object side to the image side of the optical path, a first lens E1, an aperture stop S1, a second lens E2, an aperture ST, a third lens E3, an aperture stop S2, 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.

[0160] The first lens E1 has negative refractive power. It is made of plastic. Its object side is concave near the optical axis and has two inflection points and one critical point. Its image side is convex near the optical axis and has two inflection points and one critical point. Both its object side and image side are aspherical.

[0161] The second lens E2 has positive refractive power. It is made of plastic. Its object side is convex near the optical axis and has a point of inversion. Its image side is concave near the optical axis. Both its object side and image side are aspherical.

[0162] The third lens E3 has positive refractive power. It is made of plastic. Its object side is convex near the optical axis and has a point of inversion. Its image side is convex near the optical axis. Both its object side and image side are aspherical.

[0163] The fourth lens E4 has negative refractive power. It is made of plastic. Its object side is concave near the optical axis, and its image side is convex near the optical axis. Its image side has three inflection points. Both its object side and image side are aspherical.

[0164] The fifth lens, E5, has negative refractive power. It is made of plastic. Its object side is concave near the optical axis and has two inflection points. Its image side is convex near the optical axis. Both its object side and image side are aspherical.

[0165] The sixth lens, E6, has positive refractive power. It is made of plastic. Its object side is concave near the optical axis and has two inflection points. Its image side is convex near the optical axis and has two inflection points. Both its object side and image side are aspherical.

[0166] The seventh lens E7 has negative refractive power. It is made of plastic. Its object side is convex near the optical axis and has three inflection points and one critical point. Its image side is concave near the optical axis and has one inflection point and one critical point. Both its object side and image side are aspherical.

[0167] The filter element E8 is located between the seventh lens E7 and the imaging surface IMG. It is made of glass and does not affect the focal length. The electronic image sensor IS is located on the imaging surface IMG.

[0168] Detailed optical data for the first embodiment are shown in Table 1. The units for radius of curvature, thickness, and focal length are millimeters. f represents the focal length, Fno represents the aperture value, HFOV represents half of the maximum angle of view, and surfaces 0-20 sequentially represent surfaces from the object side to the image side. The aspherical data are shown in Table 2. k represents the cone coefficient in the aspherical curve equation, and A4-A28 represent the 4th-28th 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 1 and 2 of the first embodiment, and will not be repeated here.

[0169]

[0170]

[0171]

[0172]

[0173] The equation for the aforementioned aspherical curve is expressed as follows:

[0174]

[0175] in,

[0176] X: The distance between a point on the aspherical surface at a distance Y from the optical axis and the tangent plane at the vertex on the optical axis of the aspherical surface;

[0177] Y: The perpendicular distance between a point on the aspherical curve and the optical axis;

[0178] R: Radius of curvature;

[0179] k: Conical coefficient;

[0180] Ai: The i-th order aspherical coefficient.

[0181] In the first embodiment, the thickness of the first lens E1 along the optical path on the optical axis is CT1, the optical axis distance between the first lens E1 and the second lens E2 is T12, and the focal length of the imaging optical system lens group 1 is f. The relationship is: (CT1+T12) / f=0.37.

[0182] In the first embodiment, the refractive index of the second lens E2 is N2, and the refractive index of the third lens E3 is N3, with the relationship being: (N2+N3) / 2=1.602.

[0183] In the first embodiment, the radius of curvature of the image side of the sixth lens E6 is R12, and the radius of curvature of the object side of the seventh lens E7 is R13. The relationship is: (R12+R13) / (R12-R13)=0.27.

[0184] In the first embodiment, the radius of curvature of the object side of the seventh lens E7 is R13, and the radius of curvature of the image side of the seventh lens E7 is R14. The relationship is: (R13-R14) / (R13+R14)=0.14.

[0185] In the first embodiment, the object-side curvature radius of the third lens E3 is R5, and the image-side curvature radius of the third lens E3 is R6. The relationship is: (R5+R6) / (R5-R6)=0.16.

[0186] In the first embodiment, the optical axis distance between the fourth lens E4 and the fifth lens E5 is T45, the optical axis distance between the fifth lens E5 and the sixth lens E6 is T56, the optical axis distance between the sixth lens E6 and the seventh lens E7 is T67, and the total distance between any two adjacent lenses in the imaging optical system lens group 1 on the optical axis is ΣAT, and the relationship is: (T45+T56+T67) / ΣAT=0.21.

[0187] In the first embodiment, the focal length of the imaging optical system lens group 1 is f, and the focal length of the first lens E1 is f1, with the relationship being: f / f1 = -0.56.

[0188] In the first embodiment, the focal length of the lens group 1 of the imaging optical system is f, and the combined focal length of the first lens E1 and the second lens E2 is f12, with the relationship being: f / f12=-0.33.

[0189] In the first embodiment, the focal length of the imaging optical system lens group 1 is f, and the combined focal length of the first lens E1, the second lens E2, the third lens E3 and the fourth lens E4 is f1234, with the relationship being: f / f1234=0.60.

[0190] In the first embodiment, the focal length of the imaging optical system lens group 1 is f, and the focal length of the second lens E2 is f2, with the relationship being: f / f2 = 0.23.

[0191] In the first embodiment, the focal length of the imaging optical system lens group 1 is f, and the combined focal length of the third lens E3, the fourth lens E4 and the fifth lens E5 is f345, with the relationship being: f / f345=0.53.

[0192] In the first embodiment, the focal length of the imaging optical system lens group 1 is f, and the focal length of the fifth lens E5 is f5, with the relationship being: f / f5 = -0.27.

[0193] In the first embodiment, the focal length of the imaging optical system lens group 1 is f, and the combined focal length of the fifth lens E5, the sixth lens E6 and the seventh lens E7 is f567, with the relationship being: f / f567=0.38.

[0194] In the first embodiment, the focal length of the imaging optical system lens group 1 is f, and the combined focal length of the sixth lens E6 and the seventh lens E7 is f67, with the relationship being: f / f67 = 0.65.

[0195] In the first embodiment, the focal length of the imaging optical system lens group 1 is f, and the focal length of the seventh lens E7 is f7, with the relationship being: f / f7 = -0.15.

[0196] In the first embodiment, the focal length of the imaging optical system lens group 1 is f, and the radius of curvature of the object side surface of the first lens E1 is R1, with the relationship being: f / R1=-1.60.

[0197] In the first embodiment, the focal length of the imaging optical system lens group 1 is f, and the radius of curvature of the image side of the sixth lens E6 is R12, with the relationship being: f / R12=-1.29.

[0198] In the first embodiment, the focal length of the imaging optical system lens group 1 is f, and the radius of curvature of the object side of the seventh lens E7 is R13, with the relationship being: f / R13=2.25.

[0199] In the first embodiment, the maximum distance between two adjacent lenses on the optical axis in the imaging optical system lens group 1 is MaxAT, and the sum of the distances between all two adjacent lenses on the optical axis in the imaging optical system lens group 1 is ΣAT, with the following relationship: MaxAT / ΣAT=0.33.

[0200] In the first embodiment, the refractive index of the second lens E2 is N2, and the relationship is: N2 = 1.660.

[0201] In the first embodiment, the radius of curvature of the object side of the first lens E1 is R1, and the radius of curvature of the image side of the first lens E1 is R2, with the relationship being: R1 / R2 = 0.32.

[0202] In the first embodiment, the imaging optical system lens group 1 further includes an aperture, the distance between the aperture and the imaging surface on the optical axis is SL, and the distance between the object side of the first lens E1 and the imaging surface on the optical axis is TL, the relationship is: SL / TL = 0.72.

[0203] In the first embodiment, the distance on the optical axis between the object side of the first lens E1 and the image side of the seventh lens E7 is TD, and the distance on the optical axis between the object side of the first lens E1 and the imaging plane is TL. The relationship is: TD / TL = 0.76.

[0204] Second Embodiment

[0205] Please refer to the schematic diagram of the imaging device of the second embodiment of the present invention. Figure 2A Please refer to the aberration curves. Figure 2B The imaging device of the second embodiment includes an imaging optical system lens group 2 and an electronic photosensitive element IS. The imaging optical system lens group 2 includes, from the object side to the image side of the optical path, a first lens E1, an aperture stop S1, a second lens E2, a third lens E3, an aperture ST, a fourth lens E4, an aperture stop S2, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter element E8, and an imaging surface IMG.

[0206] The first lens E1 has negative refractive power. It is made of plastic. Its object side is concave near the optical axis and has two inflection points and one critical point. Its image side is convex near the optical axis and has two inflection points and one critical point. Both its object side and image side are aspherical.

[0207] The second lens E2 has negative refractive power. It is made of plastic. Its object side is convex near the optical axis and has a point of inversion. Its image side is concave near the optical axis. Both its object side and image side are aspherical.

[0208] The third lens E3 has positive refractive power. It is made of plastic. Its object side is convex near the optical axis, and its image side is concave near the optical axis. Both its object side and image side are aspherical.

[0209] The fourth lens E4 has positive refractive power. It is made of plastic. Its object side is convex near the optical axis and has a point of inversion. Its image side is convex near the optical axis. Both its object side and image side are aspherical.

[0210] The fifth lens, E5, has negative refractive power. It is made of plastic. Its object side is concave near the optical axis and has one inflection point. Its image side is convex near the optical axis and has three inflection points and two critical points. Both its object side and image side are aspherical.

[0211] The sixth lens E6 has positive refractive power. It is made of plastic. Its object side is concave near the optical axis and has four inflection points. Its image side is convex near the optical axis and has two inflection points. Both its object side and image side are aspherical.

[0212] The seventh lens E7 has negative refractive power. It is made of plastic. Its object side is convex near the optical axis and has two inflection points and one critical point. Its image side is concave near the optical axis and has one inflection point and one critical point. Both its object side and image side are aspherical.

[0213] The filter element E8 is located between the seventh lens E7 and the imaging surface IMG. It is made of glass and does not affect the focal length. The electronic image sensor IS is located on the imaging surface IMG.

[0214] The optical data of the second embodiment is shown in Table 3, and its aspherical data is shown in Table 4.

[0215]

[0216]

[0217]

[0218]

[0219] The equations for the aspherical curves in the second embodiment are expressed in the same form as in the first embodiment. Furthermore, the parameters of each relation are as explained in the first embodiment, except that the numerical values ​​of each relation are listed in the table below.

[0220]

[0221] Third Embodiment

[0222] Please refer to the schematic diagram of the imaging device of the third embodiment of the present invention. Figure 3A Please refer to the aberration curves. Figure 3BThe imaging device of the third embodiment includes an imaging optical system lens group 3 and an electronic photosensitive element IS. The imaging optical system lens group 3 includes, from the object side to the image side of the optical path, a first lens E1, an aperture stop S1, a second lens E2, a third lens E3, an aperture ST, a fourth lens E4, an aperture stop S2, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter element E8, and an imaging surface IMG.

[0223] The first lens E1 has negative refractive power. It is made of plastic. Its object side is concave near the optical axis and has two inflection points and one critical point. Its image side is convex near the optical axis and has two inflection points and one critical point. Both its object side and image side are aspherical.

[0224] The second lens E2 has positive refractive power. It is made of plastic. Its object side is convex near the optical axis and has a point of inflection. Its image side is concave near the optical axis and has a point of inflection. Both its object side and image side are aspherical.

[0225] The third lens E3 has negative refractive power. It is made of plastic. Its object side is concave near the optical axis, and its image side is convex near the optical axis. Its image side has a recurve point and a critical point. Both its object side and image side are aspherical.

[0226] The fourth lens E4 has positive refractive power. It is made of plastic. Its object side is convex near the optical axis and has a point of inversion. Its image side is convex near the optical axis. Both its object side and image side are aspherical.

[0227] The fifth lens, E5, has negative refractive power. It is made of plastic, and its object side is concave near the optical axis, while its image side is convex near the optical axis. Furthermore, its image side has three inflection points and two critical points. Both its object side and image side are aspherical.

[0228] The sixth lens, E6, has positive refractive power. It is made of plastic. Its object side is concave near the optical axis and has two inflection points. Its image side is convex near the optical axis and has two inflection points. Both its object side and image side are aspherical.

[0229] The seventh lens E7 has negative refractive power. It is made of plastic. Its object side is convex near the optical axis and has two inflection points and one critical point. Its image side is concave near the optical axis and has one inflection point and one critical point. Both its object side and image side are aspherical.

[0230] The filter element E8 is located between the seventh lens E7 and the imaging surface IMG. It is made of glass and does not affect the focal length. The electronic image sensor IS is located on the imaging surface IMG.

[0231] The optical data of the third embodiment is shown in Table 5, and its aspherical data is shown in Table 6.

[0232]

[0233]

[0234]

[0235]

[0236]

[0237] The equations for the aspherical curves in the third embodiment are expressed in the same form as in the first embodiment. Furthermore, the parameters of each relation are as explained in the first embodiment, except that the numerical values ​​of each relation are listed in the table below.

[0238]

[0239] Fourth Embodiment

[0240] Please refer to the schematic diagram of the imaging device of the fourth embodiment of the present invention. Figure 4A Please refer to the aberration curves. Figure 4B The imaging device of the fourth embodiment includes an imaging optical system lens group 4 and an electronic photosensitive element IS. The imaging optical system lens group 4 includes, from the object side to the image side of the optical path, a first lens E1, an aperture stop S1, a second lens E2, a third lens E3, an aperture ST, a fourth lens E4, a fifth lens E5, a sixth lens E6, an aperture stop S2, a seventh lens E7, a filter element E8, and an imaging surface IMG.

[0241] The first lens E1 has negative refractive power. It is made of plastic. Its object side is concave near the optical axis and has two inflection points and one critical point. Its image side is convex near the optical axis and has two inflection points and one critical point. Both its object side and image side are aspherical.

[0242] The second lens E2 has negative refractive power. It is made of glass. Its object side is convex near the optical axis and has a point of inversion. Its image side is concave near the optical axis. Both its object side and image side are aspherical.

[0243] The third lens E3 has positive refractive power. It is made of plastic. Its object side is convex near the optical axis and has a point of inversion. Its image side is concave near the optical axis. Both its object side and image side are aspherical.

[0244] The fourth lens E4 has positive refractive power. It is made of plastic. Its object side is convex near the optical axis and has a point of inversion. Its image side is convex near the optical axis. Both its object side and image side are aspherical.

[0245] The fifth lens, E5, has positive refractive power. It is made of plastic. Its object side is concave near the optical axis and has one inflection point. Its image side is convex near the optical axis and has three inflection points. Both its object side and image side are aspherical.

[0246] The sixth lens, E6, has positive refractive power. It is made of plastic. Its object side is concave near the optical axis and has four inflection points and two critical points. Its image side is convex near the optical axis and has two inflection points. Both its object side and image side are aspherical.

[0247] The seventh lens E7 has negative refractive power. It is made of plastic. Its object side is convex near the optical axis and has two inflection points and one critical point. Its image side is concave near the optical axis and has one inflection point and one critical point. Both its object side and image side are aspherical.

[0248] The filter element E8 is located between the seventh lens E7 and the imaging surface IMG. It is made of glass and does not affect the focal length. The electronic image sensor IS is located on the imaging surface IMG.

[0249] The optical data of the fourth embodiment are shown in Table 7, and its aspherical data are shown in Table 8.

[0250]

[0251]

[0252]

[0253]

[0254] The equations for the aspherical curves in the fourth embodiment are expressed in the same form as in the first embodiment. Furthermore, the parameters of each relation are as explained in the first embodiment, except that the numerical values ​​of each relation are listed in the table below.

[0255]

[0256]

[0257] Fifth Embodiment

[0258] Please refer to the schematic diagram of the imaging device of the fifth embodiment of the present invention. Figure 5A Please refer to the aberration curves. Figure 5BThe imaging device of the fifth embodiment includes an imaging optical system lens group 5 and an electronic photosensitive element IS. The imaging optical system lens group 5 includes, from the object side to the image side of the optical path, a first lens E1, an aperture stop S1, a second lens E2, an aperture ST, a third lens E3, an aperture stop S2, 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.

[0259] The first lens E1 has negative refractive power. It is made of plastic. Its object side is concave near the optical axis and has two inflection points and one critical point. Its image side is convex near the optical axis and has two inflection points and one critical point. Both its object side and image side are aspherical.

[0260] The second lens E2 has positive refractive power. It is made of glass. Its object side is convex near the optical axis and has a point of inversion. Its image side is concave near the optical axis. Both its object side and image side are aspherical.

[0261] The third lens E3 has positive refractive power. It is made of plastic. Its object side is convex near the optical axis and has a point of inversion. Its image side is convex near the optical axis. Both its object side and image side are aspherical.

[0262] The fourth lens E4 has negative refractive power. It is made of plastic. Its object side is concave near the optical axis, and its image side is concave near the optical axis. Its image side has two inflection points and one critical point. Both its object side and image side are aspherical.

[0263] The fifth lens E5 has positive refractive power. It is made of plastic. Its object side is convex near the optical axis and has one inflection point. Its image side is concave near the optical axis and has three inflection points and one critical point. Both its object side and image side are aspherical.

[0264] The sixth lens E6 has positive refractive power. It is made of plastic. Its object side is convex near the optical axis and has three inflection points and one critical point. Its image side is convex near the optical axis and has two inflection points and one critical point. Both its object side and image side are aspherical.

[0265] The seventh lens E7 has negative refractive power. It is made of plastic. Its object side is convex near the optical axis and has two inflection points and one critical point. Its image side is concave near the optical axis and has one inflection point and one critical point. Both its object side and image side are aspherical.

[0266] The filter element E8 is located between the seventh lens E7 and the imaging surface IMG. It is made of glass and does not affect the focal length. The electronic image sensor IS is located on the imaging surface IMG.

[0267] The optical data of the fifth embodiment is shown in Table 9, and its aspherical data is shown in Table 10.

[0268]

[0269]

[0270]

[0271]

[0272] The equations for the aspherical curves in the fifth embodiment are expressed in the same form as in the first embodiment. Furthermore, the parameters of each relation are as explained in the first embodiment, except that the numerical values ​​of each relation are listed in the table below.

[0273]

[0274] The Sixth Embodiment

[0275] Please refer to the schematic diagram of the imaging device of the sixth embodiment of the present invention. Figure 6A Please refer to the aberration curves. Figure 6B The imaging device of the sixth embodiment includes an imaging optical system lens group 6 and an electronic photosensitive element IS. The imaging optical system lens group 6 includes, from the object side to the image side of the optical path, a first lens E1, an aperture stop S1, a second lens E2, an aperture ST, a third lens E3, an aperture stop S2, 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.

[0276] The first lens E1 has negative refractive power. It is made of plastic. Its object side is concave near the optical axis and has two inflection points and one critical point. Its image side is convex near the optical axis and has two inflection points and one critical point. Both its object side and image side are aspherical.

[0277] The second lens E2 has positive refractive power. It is made of plastic. Its object side is convex near the optical axis and has a point of inversion. Its image side is concave near the optical axis. Both its object side and image side are aspherical.

[0278] The third lens E3 has positive refractive power. It is made of plastic. Its object side is convex near the optical axis and has a point of inversion. Its image side is convex near the optical axis. Both its object side and image side are aspherical.

[0279] The fourth lens E4 has negative refractive power. It is made of plastic. Its object side is concave near the optical axis, and its image side is convex near the optical axis. Its image side has three inflection points and two critical points. Both its object side and image side are aspherical.

[0280] The fifth lens, E5, has negative refractive power. It is made of glass, and its object side is concave near the optical axis. It also has two inflection points and two critical points. Its image side is convex near the optical axis. Both the object side and the image side are aspherical.

[0281] The sixth lens, E6, has positive refractive power. It is made of plastic. Its object side is convex near the optical axis and has one inflection point and one critical point. Its image side is convex near the optical axis and has two inflection points. Both its object side and image side are aspherical.

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

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

[0284] The optical data of the sixth embodiment are shown in Table 11, and its aspherical data are shown in Table 12.

[0285]

[0286]

[0287]

[0288]

[0289]

[0290] The equations for the aspherical curves in the sixth embodiment are expressed in the same form as in the first embodiment. Furthermore, the parameters of each relation are as explained in the first embodiment, except that the numerical values ​​of each relation are listed in the table below.

[0291]

[0292] Seventh Embodiment

[0293] Please refer to Figure 8 This is a perspective schematic diagram illustrating an image-capturing device 100 according to a seventh embodiment of the present invention. Figure 8 As can be seen, in this embodiment, the image capturing device 100 is a camera module. The image capturing device 100 includes a photographic optical lens system 101, a driving device 102, and an electronic photosensitive element 103. The photographic optical lens system 101 includes an imaging optical system lens group 1 of the first embodiment of the present invention and a lens barrel (not otherwise labeled) that carries the imaging optical system lens group 1. The image capturing device 100 uses the photographic optical lens system 101 to focus light to generate an image, and works with the driving device 102 to focus the image. Finally, the image is imaged on the electronic photosensitive element 103 (i.e., the electronic photosensitive element IS of the first embodiment), and the image data is output.

[0294] The drive unit 102 can be an auto-focus module, and its driving method can use drive systems such as voice coil motors (VCM), microelectromechanical systems (MEMS), piezoelectric systems, and shape memory alloys. The drive unit 102 enables the photographic optical lens system 101 to achieve a better imaging position, allowing for clear images of the subject at different object distances.

[0295] The imaging device 100 can be equipped with an electronic photosensitive element 103 (such as CMOS or CCD) with high sensitivity and low noise, which is set on the imaging surface of the photographic optical lens system 101, so as to truly present the good imaging quality of the photographic optical lens system 101.

[0296] Furthermore, the image capturing device 100 may include an image stabilization module 104, which may be a kinetic energy sensing element such as an accelerometer, gyroscope, or Hall effect sensor. In the seventh embodiment, the image stabilization module 104 is a gyroscope, but it is not limited thereto. By adjusting the changes in different axes of the photographic optical lens system 101 to compensate for the blurred image caused by shaking during shooting, the imaging quality of shooting in dynamic and low-light scenes is further improved, and advanced image compensation functions such as optical image stabilization (OIS) and electronic image stabilization (EIS) are provided.

[0297] The image capturing device 100 of the present invention is not limited to application in smartphones. The image capturing device 100 can also be applied to mobile focusing systems as needed, and features excellent aberration correction and good image quality. For example, the image capturing device 100 can be widely used in automotive electronics, drones, smart electronic products, tablet computers, wearable devices, medical devices, precision instruments, surveillance cameras, personal video recorders, recognition systems, multi-lens devices, motion sensing, virtual reality, sports devices, and home intelligent assistance systems, among other electronic devices.

[0298] Eighth Embodiment

[0299] Please refer to Figures 9A to 9B ,in Figure 9A This is a front view of the electronic device 200 according to the eighth embodiment of the present invention. Figure 9B for Figure 9A Rear view of electronic device 200. In this embodiment, electronic device 200 is a smartphone. Figure 9A As shown, the front of the electronic device 200 includes a display device 210, a TOF (Time of Flight) module 201, an image capturing device 202, and an image capturing device 203. Image capturing devices 202 and 203 are located above the display device 210, facing the same direction and horizontally arranged at the upper edge of the electronic device 200. Image capturing device 202 is an ultra-wide-angle image capturing device, and image capturing device 203 is a wide-angle image capturing device. The viewing angle of image capturing device 202 is at least 30 degrees greater than the viewing angle of image capturing device 203.

[0300] like Figure 9B As shown, the back of the electronic device 200 includes a flash module 240, an image capturing device 234, and an image capturing device 236. The image capturing devices 234 and 236 face the same direction and are arranged vertically on the back of the electronic device 200. Image capturing device 234 is an ultra-wide-angle image capturing device, and image capturing device 236 is a wide-angle image capturing device, employing the imaging optical system lens group of the present invention. The viewing angle of image capturing device 234 is at least 20 degrees greater than the viewing angle of image capturing device 236.

[0301] Ninth Embodiment

[0302] Please refer to Figure 10 , Figure 10 This is a rear view of the electronic device 300 according to the ninth embodiment of the present invention. Figure 10As shown, the back of the electronic device 300 includes a flash module 340, an image capturing device 332, an image capturing device 334, and an image capturing device 336. The image capturing devices 332, 334, and 336 face the same direction and are arranged vertically on the back of the electronic device 300. The flash module 340 is located at the upper edge of the back of the electronic device 300, near the image capturing device 336. The image capturing device 336 is an ultra-wide-angle image capturing device, the image capturing device 334 is a wide-angle image capturing device employing the imaging optical system lens group of this invention, and the image capturing device 332 is a telephoto image capturing device. The viewing angle of the image capturing device 336 is at least 20 degrees greater than the viewing angle of the image capturing device 334, and the viewing angle of the image capturing device 334 is at least 20 degrees greater than the viewing angle of the image capturing device 332, such that the viewing angle of the image capturing device 336, which has the largest viewing angle among the image capturing devices on the back of the electronic device 300, is at least 40 degrees greater than the viewing angle of the image capturing device 332, which has the smallest viewing angle.

[0303] The Tenth Embodiment

[0304] Please refer to Figure 11 , Figure 11 This is a rear view of an electronic device 400 according to the tenth embodiment of the present invention. Figure 11 As shown, the back of the electronic device 400 includes a TOF (Time of Flight) module 407, a flash module 408, and image capturing devices 404a, 404b, 405a, 405b, 406a, 406b, 409a, and 409b. Image capturing devices 404a, 404b, 405a, 405b, 406a, 406b, 409a, and 409b face the same direction and are arranged vertically in two rows on the back of the electronic device 400. The TOF (Time of Flight) module 407 and the flash module 408 are located at the upper edge of the back of the electronic device 400, near the image capturing device 406a. Image capturing devices 405a and 405b are ultra-wide-angle image capturing devices, image capturing devices 404a and 404b are wide-angle image capturing devices, employing the imaging optical system lens group of the present invention. Image capturing devices 406a and 406b are telescopic image capturing devices, and image capturing devices 409a and 409b are telescopic image capturing devices with a reversing optical path. The viewing angle of image capturing devices 405a and 405b is at least 30 degrees greater than the viewing angle of image capturing devices 404a and 404b, while the viewing angle of image capturing devices 404a and 404b is at least 30 degrees greater than the viewing angle of image capturing devices 406a, 406b, 409a and 409b.

[0305] Eleventh Embodiment

[0306] Please refer to Figures 12A to 12B ,in Figure 12A This is a front view of the electronic device 500 according to the eleventh embodiment of the present invention. Figure 12B for Figure 12A Rear view of electronic device 500. In this embodiment, electronic device 500 is a smartphone.

[0307] like Figure 12A As shown, the front of the electronic device 500 includes a display device 510 and an image-capturing device 520, wherein the image-capturing device 520 employs the lens group of the imaging optical system of the present invention. Figure 12B As shown, the back of the electronic device 400 includes a telephoto lens 530, a wide-angle lens 540, and an ultra-wide-angle lens 550.

[0308] The aforementioned electronic device is merely an illustrative example of practical application of the present invention and is not intended to limit the scope of application of the imaging device of the present invention. Preferably, the electronic device may further include a control unit, a display unit, a storage unit, a temporary storage unit (RAM), or a combination thereof.

[0309] The tables above show different numerical variations of the imaging optical system lens group in the embodiments disclosed in this invention. However, the numerical variations in each embodiment of this invention are all obtained experimentally. Even if different values ​​are used, products with the same structure should still fall within the protection scope disclosed in this invention. Therefore, the descriptions and figures above are only illustrative and are not intended to limit the scope of patent protection disclosed in this invention.

Claims

1. A lens assembly for an imaging optical system, characterized in that, It comprises seven lenses, which are arranged in order from the object side to the image side of 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 first lens to the seventh lens includes an object-side surface facing the object side and an image-side surface facing the image side. The first lens has negative refractive power, the object side of the first lens is concave near the optical axis and the image side of the first lens is convex near the optical axis, and the object side of the second lens is convex near the optical axis; the fourth lens has positive refractive power, the object side of the fourth lens is convex near the optical axis and the image side of the fourth lens is convex near the optical axis. Wherein, the focal length of the lens group in the imaging optical system is f, the focal length of the first lens is f1, the combined focal length of the sixth and seventh lenses is f67, the object-side radius of curvature of the first lens is R1, the image-side radius of curvature of the first lens is R2, the object-side radius of curvature of the third lens is R5, the image-side radius of curvature of the third lens is R6, the image-side radius of curvature of the sixth lens is R12, the object-side radius of curvature of the seventh lens is R13, and the image-side radius of curvature of the seventh lens is R14, which satisfy the following relationship: -2.50 < f / f1 < -0.25; 0.00 < f / f67 < 2.50; 0.12 < R1 / R2; (R5+R6) / (R5-R6) < 1.20; 0.10 < (R12+R13) / (R12-R13) < 5.00; and -1.55 < (R13-R14) / (R13+R14).

2. The imaging optical system lens assembly as described in claim 1, characterized in that, The focal length of the lens group in the imaging optical system is f, and the radius of curvature of the object-side surface of the first lens is R1, which satisfies the following relationship: -1.75 < f / R1 < -1.

15.

3. The imaging optical system lens assembly as described in claim 1, characterized in that, The imaging optical system further includes an aperture, the distance between the aperture and the imaging plane on the optical axis being SL, and the distance between the object side of the first lens and the imaging plane on the optical axis being TL, which satisfy the following relationship: 0.52 < SL / TL < 0.

81.

4. The imaging optical system lens assembly as described in claim 1, characterized in that, The focal length of the lens group in the imaging optical system is f, and the combined focal length of the first lens, the second lens, the third lens, and the fourth lens is f1234, which satisfies the following relationship: -0.25 < f / f1234 < 0.

82.

5. The imaging optical system lens assembly as described in claim 1, characterized in that, The maximum distance between two adjacent lenses on the optical axis in the imaging optical system lens group is MaxAT, and the sum of the distances between all two adjacent lenses on the optical axis in the imaging optical system lens group is ΣAT, which satisfies the following relationship: 0.17 < MaxAT / ΣAT < 0.

40.

6. The imaging optical system lens assembly as described in claim 1, characterized in that, Both the object-side surface of the first lens and the image-side surface of the seventh lens contain at least one critical point. The focal length of the lens group of the imaging optical system is f, and the focal length of the second lens is f2, which satisfy the following relationship: -0.60 < f / f2 < 0.

70.

7. The imaging optical system lens assembly as described in claim 1, characterized in that, The thickness of the first lens along the optical path on the optical axis is CT1, the optical axis distance between the first lens and the second lens is T12, and the focal length of the lens group of the imaging optical system is f, which satisfies the following relationship: 0.25 < (CT1+T12) / f < 0.

50.

8. An image capturing device, characterized in that, It includes an imaging optical system lens assembly as described in claim 1 and an electronic photosensitive element.

9. An electronic device, characterized in that, It includes the imaging device as described in claim 8.

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