CN111522130B

CN111522130B - Optical photographing lens assembly, image capturing device and electronic device

Info

Publication number: CN111522130B
Application number: CN201910101783.5A
Authority: CN
Inventors: 林振诚; 曾昱泰; 郭子杰
Original assignee: Largan Precision Co Ltd
Current assignee: Largan Precision Co Ltd
Priority date: 2019-02-01
Filing date: 2019-02-01
Publication date: 2021-07-06
Anticipated expiration: 2039-02-01
Also published as: CN111522130A

Abstract

The invention discloses an optical photographing lens group, which comprises seven lenses, wherein the seven lenses are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an image side in sequence. The seven lenses respectively have an object side surface facing the object side direction and an image side surface facing the image side direction. The object-side surface of the first lens element is concave at a paraxial region thereof, and the object-side surface of the first lens element is aspheric and has at least one critical point at an off-axis region thereof. When specific conditions are satisfied, the optical photographing lens assembly can satisfy the requirements of miniaturization and wide viewing angle at the same time. The invention also discloses an image capturing device with the optical photographing lens group and an electronic device with the image capturing device.

Description

Optical photographing lens assembly, image capturing device and electronic device

Technical Field

The present invention relates to an optical photographing lens assembly, an image capturing device and an electronic device, and more particularly, to an optical photographing lens assembly and an image capturing device suitable for an electronic device.

Background

As the performance of the electronic photosensitive device is improved with the advance of semiconductor process technology, the pixel can reach a smaller size, and thus, the optical lens with high imaging quality is an indispensable factor.

With the technology, the application range of the electronic device equipped with the optical lens is wider, and the requirements for the optical lens are more diversified. Since the conventional optical lens is not easy to balance the requirements of imaging quality, sensitivity, aperture size, volume or visual angle, the present invention provides an optical lens to meet the requirements.

Disclosure of Invention

The invention provides an optical photographing lens assembly, an image capturing device and an electronic device. The optical photographing lens group comprises seven lenses. When specific conditions are met, the optical photographing lens group provided by the invention can meet the requirements of miniaturization and wide visual angle at the same time.

The invention provides an optical photographic lens group, comprising seven lenses. The seventh lens element is, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. The seven lenses respectively have an object side surface facing the object side direction and an image side surface facing the image side direction. The object-side surface of the first lens element is concave at a paraxial region thereof, and the object-side surface of the first lens element is aspheric and has at least one critical point at an off-axis region thereof. The third lens element with positive refractive power. The fifth lens element has a concave object-side surface at a paraxial region. The sum of the distances between every two adjacent lenses in the optical photographing lens group is Σ AT, the distance between the second lens and the third lens is T23, the focal length of the optical photographing lens group is f, and the focal length of the sixth lens is f6, which satisfies the following conditions:

2.20< Σ AT/T23< 12.5; and

|f6/f|<0.90。

the invention also provides an optical photographic lens group, which comprises seven lenses. The seventh lens element is, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. The seven lenses respectively have an object side surface facing the object side direction and an image side surface facing the image side direction. The object-side surface of the first lens element is concave at a paraxial region thereof, and the object-side surface of the first lens element is aspheric and has at least one critical point at an off-axis region thereof. The fifth lens element has a concave object-side surface at a paraxial region. The sum of the distances between every two adjacent lenses in the optical photographing lens group is Σ AT, the distance between the second lens and the third lens is T23, the focal length of the optical photographing lens group is f, and the focal length of the sixth lens is f6, which satisfies the following conditions:

2.20< Σ AT/T23< 7.10; and

|f6/f|<0.90。

the invention further provides an optical photographing lens assembly, which comprises seven lenses. The seventh lens element is, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. The seven lenses respectively have an object side surface facing the object side direction and an image side surface facing the image side direction. The first lens element has a concave object-side surface at a paraxial region, a aspheric object-side surface having at least one critical point at an off-axis region, and a convex image-side surface at a paraxial region. The third lens element with positive refractive power. The total of the distances between every two adjacent lenses in the optical photographing lens assembly on the optical axis is Σ AT, the distance between the second lens and the third lens on the optical axis is T23, the distance between the fifth lens and the sixth lens on the optical axis is T56, the focal length of the optical photographing lens assembly is f, the focal length of the fifth lens is f5, and the thickness of the fifth lens on the optical axis is CT5, which satisfies the following conditions:

1.20<ΣAT/T23<90.0；

-24.0< f5/f < 0; and

1.80<CT5/T56。

the invention provides an image capturing device, which comprises the optical photographing lens assembly and an electronic photosensitive element, wherein the electronic photosensitive element is arranged on an imaging surface of the optical photographing lens assembly.

The invention provides an electronic device comprising the image capturing device.

When Σ AT/T23 satisfies the above condition, the lens arrangement in the optical photographing lens group can be adjusted to balance between increasing the angle of view and compressing the volume.

When the | f6/f | satisfies the above condition, the sixth lens element can have a proper refractive power to help compress the volume.

When f5/f satisfies the above condition, the fifth lens element can have a negative refractive power with sufficient strength to balance the aberration generated by the system for compressing the volume.

When CT5/T56 satisfies the above conditions, the fifth lens and the sixth lens can be made to cooperate to correct off-axis aberrations.

The foregoing summary of the invention, as well as the following detailed description of the embodiments, is provided to illustrate and explain the principles and spirit of the invention, and to provide further explanation of the invention as claimed.

Drawings

Fig. 1 is a schematic view of an image capturing apparatus according to a first embodiment of the invention.

Fig. 2 is a graph of spherical aberration, astigmatism and distortion in the first embodiment from left to right.

Fig. 3 is a schematic view of an image capturing apparatus according to a second embodiment of the invention.

Fig. 4 is a graph of spherical aberration, astigmatism and distortion of the second embodiment, from left to right.

Fig. 5 is a schematic view of an image capturing apparatus according to a third embodiment of the invention.

Fig. 6 is a graph of spherical aberration, astigmatism and distortion of the third embodiment from left to right.

Fig. 7 is a schematic view of an image capturing apparatus according to a fourth embodiment of the invention.

Fig. 8 is a graph of spherical aberration, astigmatism and distortion of the fourth embodiment, from left to right.

Fig. 9 is a schematic view of an image capturing apparatus according to a fifth embodiment of the invention.

Fig. 10 is a graph of spherical aberration, astigmatism and distortion in the fifth embodiment from left to right.

Fig. 11 is a schematic view of an image capturing apparatus according to a sixth embodiment of the invention.

Fig. 12 is a graph showing the spherical aberration, astigmatism and distortion of the sixth embodiment in order from left to right.

Fig. 13 is a schematic view of an image capturing apparatus according to a seventh embodiment of the invention.

Fig. 14 is a graph showing the spherical aberration, astigmatism and distortion in order from left to right in the seventh embodiment.

Fig. 15 is a schematic view of an image capturing apparatus according to an eighth embodiment of the invention.

Fig. 16 is a graph showing the spherical aberration, astigmatism and distortion of the eighth embodiment from left to right.

Fig. 17 is a schematic view of an image capturing apparatus according to a ninth embodiment of the invention.

Fig. 18 is a graph showing the spherical aberration, astigmatism and distortion of the ninth embodiment in the order from left to right.

Fig. 19 is a schematic view of an image capturing apparatus according to a tenth embodiment of the invention.

Fig. 20 is a graph showing the spherical aberration, astigmatism and distortion of the tenth embodiment in order from left to right.

Fig. 21 is a perspective view of an image capturing device according to an eleventh embodiment of the invention.

Fig. 22 is a perspective view of one side of an electronic device according to a twelfth embodiment of the invention.

Fig. 23 is a perspective view of the other side of the electronic device of fig. 22.

FIG. 24 is a system block diagram of the electronic device of FIG. 22.

FIG. 25 is a diagram illustrating parameters Y11, Y72, Yc11 and Yc72 and the inflection points and critical points of a partial lens according to the first embodiment of the present invention.

Wherein, the reference numbers:

an image taking device: 10. 10a, 10b

An imaging lens: 11

A driving device: 12

An electron-sensitive element: 13

The image stabilization module: 14

An electronic device: 20

A flash module: 21

A focusing auxiliary module: 22

An image signal processor: 23

A user interface: 24

The image software processor: 25

A subject: 26

Point of inflection: p

Critical point: c

Aperture: 100. 200, 300, 400, 500, 600, 700, 800, 900, 1000

Diaphragm: 301. 401, 501, 502, 601, 602, 701, 702, 801, 802, 901, 1001

A first lens: 110. 210, 310, 410, 510, 610, 710, 810, 910, 1010

An object-side surface: 111. 211, 311, 411, 511, 611, 711, 811, 911, 1011

Image-side surface: 112. 212, 312, 412, 512, 612, 712, 812, 912, 1012

A second lens: 120. 220, 320, 420, 520, 620, 720, 820, 920, 1020

An object-side surface: 121. 221, 321, 421, 521, 621, 721, 821, 921, 1021

Image-side surface: 122. 222, 322, 422, 522, 622, 722, 822, 922, 1022

A third lens: 130. 230, 330, 430, 530, 630, 730, 830, 930, 1030

An object-side surface: 131. 231, 331, 431, 531, 631, 731, 831, 931, 1031

Image-side surface: 132. 232, 332, 432, 532, 632, 732, 832, 932, 1032

A fourth lens: 140. 240, 340, 440, 540, 640, 740, 840, 940, 1040

An object-side surface: 141. 241, 341, 441, 541, 641, 741, 841, 941, 1041

Image-side surface: 142. 242, 342, 442, 542, 642, 742, 842, 942, 1042

A fifth lens: 150. 250, 350, 450, 550, 650, 750, 850, 950, 1050

An object-side surface: 151. 251, 351, 451, 551, 651, 751, 851, 951, 1051

Image-side surface: 152. 252, 352, 452, 552, 652, 752, 852, 952, 1052

A sixth lens: 160. 260, 360, 460, 560, 660, 760, 860, 960, 1060

An object-side surface: 161. 261, 361, 461, 561, 661, 761, 861, 961, 1061

Image-side surface: 162. 262, 362, 462, 562, 662, 762, 862, 962, 1062

A seventh lens: 170. 270, 370, 470, 570, 670, 770, 870, 970, 1070

An object-side surface: 171. 271, 371, 471, 571, 671, 771, 871, 971, 1071

Image-side surface: 172. 272, 372, 472, 572, 672, 772, 872, 972, 1072

A filter element: 180. 280, 380, 480, 580, 680, 780, 880, 980, 1080

Imaging surface: 190. 290, 390, 490, 590, 690, 790, 890, 990, 1090

An electron-sensitive element: 195. 295, 395, 495, 595, 695, 795, 895, 995, 1095

Y11: maximum effective radius of object-side surface of the first lens

Y72: maximum effective radius of image-side surface of seventh lens

Yc 11: the vertical distance between the optical axis and the critical point of the object-side surface of the first lens

Yc 72: the vertical distance between the optical axis and the critical point on the image-side surface of the seventh lens element

Detailed Description

The optical photographing lens assembly comprises seven lenses, wherein the seven lenses are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in sequence from an object side to an image side. The seven lenses respectively have an object side surface facing the object side direction and an image side surface facing the image side direction.

The object side surface of the first lens element is concave at a paraxial region; therefore, the volume is compressed and the visual angle is increased. The image-side surface of the first lens element can be convex at a paraxial region; therefore, the symmetry of the optical photographing lens group is improved to reduce the generation of aberration.

The second lens element with positive refractive power; therefore, the positive refractive power distribution of the optical photographic lens group can be dispersed so as to reduce the aberration generated by the single lens. The object-side surface of the second lens element may be convex at a paraxial region; therefore, the lens can be matched with the first lens to reduce off-axis aberration. The image-side surface of the second lens element can be concave at a paraxial region; this helps correct astigmatism.

The third lens element with positive refractive power; thereby, the positive refractive power required for compressing the volume can be provided. The image-side surface of the third lens element can be convex at a paraxial region; therefore, the light traveling direction can be adjusted to maintain the total length of the optical photographic lens group and help to increase the area of an imaging surface.

The fourth lens element with negative refractive power; therefore, the aberration generated by reducing the volume in the optical photographing lens group can be balanced. The position of the maximum effective radius of the image side surface of the fourth lens is closer to the object side than the center of the image side surface of the fourth lens; therefore, the fourth lens has a proper surface shape, and the area of an imaging surface is increased.

The fifth lens element may have a concave object-side surface at a paraxial region; therefore, the incident angle of the light ray on the fifth lens can be adjusted to reduce the surface reflection. The fifth lens element with negative refractive power; therefore, the optical lens can be matched with the sixth lens to correct the aberration. The image-side surface of the fifth lens element can be convex at a paraxial region; therefore, the light traveling direction can be adjusted, and the visual angle and the area of the imaging surface can be increased.

The sixth lens element with positive refractive power; therefore, the capability of converging light at the image side end of the optical photographic lens group can be provided. The image-side surface of the sixth lens element at a paraxial region thereof can be convex; therefore, the sixth lens element has appropriate refractive power.

The seventh lens element with negative refractive power; therefore, the refractive power configuration of the image side end of the optical photographing lens group is balanced, and the generation of aberration is reduced. The seventh lens element may have a convex object-side surface at a paraxial region; therefore, the surface shape of the seventh lens can be adjusted, and off-axis image bending can be corrected. The image-side surface of the seventh lens element can be concave at a paraxial region; therefore, the optical photographing lens group can have proper back focal length.

In the optical photographing lens assembly disclosed by the invention, at least one surface of each of at least three lenses can be an aspheric surface and respectively provided with at least one inflection point. Therefore, the change degree of the lens surface can be improved, the volume is compressed, and the imaging quality is improved. In one embodiment, at least one surface of each of the at least four lenses in the optical photographing lens assembly is aspheric and has at least one inflection point. In another embodiment, at least one surface of each of at least five lenses in the optical photographing lens group is aspheric and has at least one inflection point. Referring to fig. 25, a schematic diagram of an inflection point P of the first lens element 110, the fourth lens element 140, the fifth lens element 150, the sixth lens element 160 and the seventh lens element 170 according to the first embodiment of the present invention is shown.

In the optical photographing lens assembly disclosed by the invention, at least one surface of each of at least two lenses can be an aspheric surface and has at least one critical point at an off-axis position. Therefore, the variation degree of the lens surface can be further improved, so that the peripheral image quality is improved. In one embodiment, at least one surface of each of at least three lenses in the optical photographing lens assembly is aspheric and has at least one critical point at the off-axis position. Referring to fig. 25, a diagram of a critical point C of the first lens element 110, the sixth lens element 160 and the seventh lens element 170 according to the first embodiment of the present invention is shown.

The object-side surface of the first lens element is aspheric and has at least one critical point at the off-axis position. Therefore, the incident angle of the light with wide view field can be adjusted to reduce the surface reflection and further improve the image illumination.

The image-side surface of the first lens element can be aspheric and can have at least one critical point off-axis. Thereby, off-axis aberrations are corrected.

The object-side surface of the seventh lens element may be aspheric and may have at least one critical point at an off-axis position. Therefore, the incident angle of the light on the seventh lens can be adjusted to improve the peripheral image quality.

The image-side surface of the seventh lens element can be aspheric and can have at least one critical point located off-axis. Therefore, the quality of the peripheral image can be further improved, and the area of an imaging surface is increased.

The sum of the distances between every two adjacent lenses in the optical photographing lens group is Σ AT, and the distance between the second lens and the third lens on the optical axis is T23, which satisfies the following conditions: 1.20< Σ AT/T23< 90.0. Therefore, the lens configuration in the optical photographing lens group can be adjusted to balance between the increased visual angle and the compressed volume. In one embodiment, it may also satisfy the following condition: 1.60< Σ AT/T23< 40.0. In another embodiment, it may also satisfy the following conditions: 2.20< Σ AT/T23< 12.5. In yet another embodiment, it may also satisfy the following condition: 2.20< Σ AT/T23< 7.10. In yet another embodiment, it may also satisfy the following condition: 2.50< Σ AT/T23< 5.50.

The focal length of the optical photographing lens group is f, and the focal length of the sixth lens is f6, which satisfies the following conditions: i f6/f < 0.90. Therefore, the sixth lens element has appropriate refractive power and is favorable for volume compression. In one embodiment, it may also satisfy the following condition: 0.40< | f6/f | < 0.80.

The focal length of the optical photographing lens group is f, the focal length of the fifth lens is f5, and the following conditions can be satisfied: -24.0< f5/f <0. Therefore, the fifth lens element has a negative refractive power with sufficient strength to balance the aberration generated by the system in the compressed volume. In one embodiment, it may also satisfy the following condition: -12.0< f5/f <0. In another embodiment, it may also satisfy the following conditions: -6.0< f5/f <0.

The thickness of the fifth lens element along the optical axis is CT5, and the distance between the fifth lens element and the sixth lens element along the optical axis is T56, which satisfies the following conditions: 1.80< CT 5/T56. Therefore, the fifth lens and the sixth lens can be matched with each other to correct off-axis aberration. In one embodiment, it may also satisfy the following condition: 2.50< CT5/T56< 100.

The abbe number of the fourth lens is V4, and the abbe number of the fifth lens is V5, which can satisfy the following conditions: 20.0< V4+ V5< 70.0. Therefore, the fourth lens and the fifth lens can be matched with each other to reduce chromatic aberration. In one embodiment, it may also satisfy the following condition: 30.0< V4+ V5< 60.0.

The sum of the lens thicknesses of the lenses in the optical photographing lens group on the optical axis is Σ CT, and the sum of the distances between every two adjacent lenses in the optical photographing lens group on the optical axis is Σ AT, which satisfies the following conditions: 2.0< Σ CT/Σ AT < 3.0. Thereby, the lens configuration can be adjusted to compress the total length of the optical photographing lens group.

The second lens element has an optical thickness CT2, and the first lens element and the second lens element are separated by an optical distance T12, which satisfies the following conditions: 10.0< CT2/T12< 100. Therefore, the first lens and the second lens can be matched with each other to improve the peripheral image quality.

The focal length of the second lens is f2, and the focal length of the third lens is f3, which satisfies the following conditions: 0.30< f2/f3< 5.0. Therefore, the refractive power configurations of the second lens element and the third lens element can be adjusted to compress the volume. In one embodiment, it may also satisfy the following condition: 0.60< f2/f3< 4.0.

The distance TL from the object-side surface of the first lens element to the image plane on the optical axis and the focal length f of the photographing optical lens assembly satisfy the following conditions: 1.40< TL/f < 1.70. Therefore, the balance between the volume compression and the visual angle increase can be obtained.

The distance TL from the object-side surface of the first lens element to the image plane on the optical axis is, the entrance pupil aperture of the photographing optical lens assembly is EPD, and the following conditions are satisfied: 2.2< TL/EPD < 4.0. Therefore, balance can be obtained between the compression volume and the enlargement of the aperture.

The optical photographic lens group has a focal length f, a radius of curvature of the object-side surface of the first lens element is R1, and a radius of curvature of the image-side surface of the first lens element is R2, wherein the following conditions are satisfied: 2.0< f/| R1| + f/| R2 |. Therefore, the first lens has a proper surface shape to match with the configuration of a wide visual angle. In one embodiment, it may also satisfy the following condition: 2.10< f/| R1| + f/| R2| < 2.85.

The optical photographing lens group disclosed by the invention further comprises an aperture, wherein the aperture can be arranged between a shot object and the fourth lens; thereby, the volume of the optical photographing lens group is facilitated to be compressed. In one embodiment, the aperture may be disposed between the first lens and the third lens; this helps to maintain the overall length of the optical photographing lens group in a configuration with a large angle of view.

An axial distance from the aperture stop to the image plane is SL, an axial distance from the object-side surface of the first lens element to the image plane is TL, and the following conditions are satisfied: 0.70< SL/TL < 1.1. Therefore, the position of the aperture can be adjusted to balance between the visual angle and the volume. In one embodiment, it may also satisfy the following condition: 0.80< SL/TL < 0.94.

The focal length of the optical photographing lens group is f, the focal length of the second lens is f2, and the following conditions can be satisfied: 0.15< f/f2< 0.80. Therefore, the second lens element has a positive refractive power with a proper strength, so as to avoid generating excessive aberration when the volume is compressed. In one embodiment, it may also satisfy the following condition: 0.20< f/f2< 0.70.

A radius of curvature of the object-side surface of the third lens element is R5, and a radius of curvature of the image-side surface of the third lens element is R6, wherein the following conditions are satisfied: -0.25< (R5+ R6)/(R5-R6) < 3.5. Therefore, the surface shape of the third lens element can be adjusted to make the third lens element have proper refractive power. In one embodiment, it may also satisfy the following condition: 0.35< (R5+ R6)/(R5-R6) < 2.5.

The maximum effective radius of the image-side surface of the seventh lens element is Y72, and the axial distance between the object-side surface of the first lens element and the image-side surface of the seventh lens element is TD, which satisfies the following conditions: 0.65< Y72/TD < 1.2. Therefore, the optical photographing lens group has proper volume distribution to match the configuration of wide visual angle and short total length. In one embodiment, it may also satisfy the following condition: 0.70< Y72/TD < 1.0. Referring to FIG. 25, a parameter Y72 according to a first embodiment of the present invention is shown.

A vertical distance between a critical point of the image-side surface of the seventh lens element and the optical axis is Yc72, and a maximum effective radius of the image-side surface of the seventh lens element is Y72, wherein: 0.35< Yc72/Y72< 0.70. Therefore, the position of the critical point can be adjusted to further improve the quality of the peripheral image. FIG. 25 is a diagram illustrating parameters Y72 and Yc72 and a critical point C of the image-side surface 172 of the seventh lens element according to the first embodiment of the present invention.

The focal length of the optical photographing lens group is f, and the focal length of the fourth lens is f4, which satisfies the following conditions: -1.0< f/f4< 0.60. Therefore, the refractive power configuration of the fourth lens element can be adjusted to balance the refractive power distribution of the optical photographing lens assembly. In one embodiment, it may also satisfy the following condition: -0.80< f/f4< 0.30.

The distance TL from the object-side surface of the first lens element to the image plane on the optical axis satisfies the following condition: 2.5[ mm ] < TL <8.5[ mm ]. Therefore, the optical photographic lens group can have the total length with proper length to be matched with various applications. In one embodiment, it may also satisfy the following condition: 4.0[ mm ] < TL <7.0[ mm ].

The distance TL from the object-side surface of the first lens element to the image plane on the optical axis is, the maximum image height of the photographing lens assembly is ImgH (half of the total length of the diagonal line of the effective sensing area of the electronic sensor), which satisfies the following conditions: 0.80< TL/ImgH < 1.45. Therefore, the balance between the compression of the total length and the enlargement of the imaging surface can be obtained.

The distance TL from the object-side surface of the first lens element to the image plane on the optical axis, the maximum imaging height of the photographing optical lens assembly is ImgH, and half of the maximum viewing angle in the photographing optical lens assembly is HFOV, which satisfies the following conditions: 1.20< TL/ImgH + cot (HFOV) < 2.40. Therefore, the optical photographic lens group is beneficial to obtaining balance among the volume, the visual angle and the imaging quality.

An abbe number of the first lens is V1, an abbe number of the second lens is V2, an abbe number of the third lens is V3, an abbe number of the fourth lens is V4, an abbe number of the fifth lens is V5, an abbe number of the sixth lens is V6, an abbe number of the seventh lens is V7, an abbe number of the ith lens is Vi, a refractive index of the first lens is N1, a refractive index of the second lens is N2, a refractive index of the third lens is N3, a refractive index of the fourth lens is N4, a refractive index of the fifth lens is N5, a refractive index of the sixth lens is N6, a refractive index of the seventh lens is N7, a refractive index of the ith lens is Ni, and at least one lens of the optical photographing lens group may satisfy the following conditions: Vi/Ni <12.0, where i ═ 1, 2, 3, 4, 5, 6, or 7. Therefore, the lens material can be adjusted, and aberration such as chromatic aberration and the like can be corrected.

The radius of curvature of the object-side surface of the first lens element is R1, and the focal length of the optical photographic lens assembly is f, which satisfies the following conditions: -1.30< R1/f <0. Therefore, the surface shape of the first lens can be adjusted, so that the first lens has proper refractive power strength.

The maximum effective radius of the image side surface of the seventh lens element is Y72, and the focal length of the optical photographing lens group is f, which satisfies the following conditions: 0.80< Y72/f < 1.10. Therefore, the optical photographic lens group is beneficial to obtaining balance between volume compression and angle of view adjustment.

The focal length of the optical photographing lens group is f, the focal length of the first lens is f1, and the following conditions can be satisfied: -0.50< f/f1< 0.40. Therefore, the first lens element can have proper refractive power strength to match the configuration of wide viewing angle. In one embodiment, it may also satisfy the following condition: -0.30< f/f1< 0.35.

The vertical distance between the optical axis and the critical point of the object-side surface of the first lens element is Yc11, and the maximum effective radius of the object-side surface of the first lens element is Y11, which satisfies the following conditions: 0.50< Yc11/Y11< 0.80. Therefore, the surface shape of the first lens can be adjusted to further improve the image illumination. Referring to FIG. 25, parameters Y11 and Yc11 and a critical point C of the object-side surface 111 of the first lens element according to the first embodiment of the present invention are shown.

A radius of curvature of the object-side surface of the fifth lens element is R9, and a radius of curvature of the image-side surface of the fifth lens element is R10, wherein the following conditions are satisfied: -0.30< R9/R10< 0.70. Therefore, the surface shape of the fifth lens can be adjusted, and the quality of peripheral images is improved.

The focal length of the optical photographing lens group is f, and the combined focal length of the first lens and the second lens is f12, which satisfies the following conditions: 0< f12/f < 5.0. Therefore, the first lens and the second lens can be mutually matched to compress the volume. In one embodiment, it may also satisfy the following condition: 1.0< f12/f < 4.0.

The aperture value (F-number) of the optical photographing lens group is Fno, which satisfies the following condition: 1.20< Fno < 2.40. Therefore, the optical photographing lens group can be provided with a diaphragm with a proper size to be matched with various applications.

Half of the maximum viewing angle in the optical photographing lens group is HFOV, which can satisfy the following conditions: 40.0[ degrees ] < HFOV <70.0[ degrees ]. Therefore, the optical photographing lens group has the characteristic of wide visual angle, and can avoid the generation of excessive distortion due to overlarge visual angle. In one embodiment, it may also satisfy the following condition: 45.0[ degree ] < HFOV <55.0[ degree ].

The maximum effective radius of the object-side surface of the first lens element is Y11, and the maximum effective radius of the image-side surface of the seventh lens element is Y72, which satisfy the following conditions: 1.80< Y72/Y11< 2.80. Therefore, the lens outer diameter ratio can be adjusted, and the miniaturization of the optical photographing lens group can be maintained under the configuration of a wide visual angle.

The focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, the focal length of the seventh lens is f7, and the focal length of the ith lens is fi, which satisfies the following conditions: i f6| <ifi |, where i ═ 1, 2, 3, 4, 5, 7. Therefore, the refractive power distribution of the optical photographic lens group can be adjusted, and the wide-angle lens with short total length can be formed.

The focal length of the optical photographing lens group is f, and the focal length of the seventh lens is f7, which satisfies the following conditions: -3.0< f/f7< -0.50. Therefore, the seventh lens element has a suitable refractive power, which is helpful for adjusting the back focal length. In one embodiment, it may also satisfy the following condition: -2.5< f/f7< -0.75.

All technical features of the optical photographing lens assembly of the invention can be combined and configured to achieve corresponding effects.

In the optical photographing lens assembly disclosed by the invention, the lens can be made of glass or plastic. If the lens is made of glass, the degree of freedom of the refractive power configuration of the optical photographing lens assembly can be increased, and the glass lens can be manufactured by grinding or molding. If the lens material is plastic, the production cost can be effectively reduced. In addition, the mirror surface can be provided with an Aspheric Surface (ASP), so that more control variables can be obtained, the aberration can be reduced, the number of lenses can be reduced, and the total length of the optical photographic lens group can be effectively reduced.

In the optical photographing lens assembly disclosed by the invention, if the lens surface is an aspheric surface, all or part of the optical effective area of the lens surface is the aspheric surface.

In the optical photographic lens group disclosed by the invention, additives can be selectively added into any one (more) lens material to change the transmittance of the lens to light rays with a specific waveband, so that stray light and color cast are reduced. For example: the additive can have the function of filtering light rays in a wave band of 600 nanometers to 800 nanometers in the system, so that redundant red light or infrared light can be reduced; or the light with wave band of 350 nm to 450 nm can be filtered out to reduce the redundant blue light or ultraviolet light, therefore, the additive can prevent the light with specific wave band from causing interference to the imaging. In addition, the additives can be uniformly mixed in the plastic and made into the lens by the injection molding technology.

In the optical photographing lens assembly disclosed by the invention, if the lens surface is a convex surface and the position of the convex surface is not defined, the convex surface can be positioned at the position close to the optical axis of the lens surface; if the lens surface is concave and the position of the concave surface is not defined, it means that the concave surface can be located at the position of the lens surface near the optical axis. If the refractive power or focal length of the lens element does not define the position of the lens region, it means that the refractive power or focal length of the lens element can be the refractive power or focal length of the lens element at the paraxial region.

In the optical photographing lens group disclosed by the invention, the Inflection Point (Inflection Point) of the lens surface refers to a boundary Point of positive and negative changes of the curvature of the lens surface. The Critical Point (Critical Point) of the lens surface refers to a tangent Point on a tangent line of a plane perpendicular to the optical axis and tangent to the lens surface, and the Critical Point is not located on the optical axis.

In the optical photographing lens assembly disclosed by the invention, the image plane of the optical photographing lens assembly can be a plane or a curved surface with any curvature according to the difference of the corresponding electronic photosensitive elements, in particular to a curved surface with a concave surface facing to the object side.

In the optical photographing lens assembly disclosed by the invention, more than one imaging correction element (flat field element and the like) can be selectively arranged between the lens closest to the imaging surface and the imaging surface so as to achieve the effect of correcting images (image curvature and the like). The optical properties of the image modifying element, such as curvature, thickness, refractive index, position, profile (convex or concave, spherical or aspherical, diffractive, fresnel, etc.) can be adjusted to suit the requirements of the image capturing device. In general, the preferred imaging correction element is configured such that a thin plano-concave element having a concave surface facing the object side is disposed near the imaging surface.

The optical photographing lens assembly disclosed in the present invention may be provided with at least one Stop, which may be located before the first lens, between the lenses or after the last lens, and the Stop may be of a type such as a flare Stop (Glare Stop) or a Field Stop (Field Stop), which may be used to reduce stray light and help to improve image quality.

In the optical photographing lens assembly disclosed by the invention, the diaphragm can be configured as a front diaphragm or a middle diaphragm. The front diaphragm means that the diaphragm is arranged between the object to be shot and the first lens, and the middle diaphragm means that the diaphragm is arranged between the first lens and the imaging surface. If the diaphragm is a front diaphragm, a longer distance can be generated between the Exit Pupil (Exit Pupil) and the imaging surface, so that the Exit Pupil has a Telecentric (telecentricity) effect, and the image receiving efficiency of a CCD (charge coupled device) or a CMOS (complementary metal oxide semiconductor) of the electronic photosensitive element can be increased; the intermediate diaphragm contributes to an increase in the field angle of the optical photographing lens group.

The present invention can be suitably provided with a variable aperture element, which can be a mechanical member or a light control element, which can control the size and shape of the aperture by an electric or electrical signal. The mechanical component can comprise a blade group, a shielding plate and other movable parts; the light regulating element may comprise a light filtering element, an electrochromic material, a liquid crystal layer and other shielding materials. The variable aperture element can enhance the image adjusting capability by controlling the light input amount or the exposure time of the image. In addition, the variable aperture element can also be an aperture of the present invention, and the image quality, such as the depth of field or the exposure speed, can be adjusted by changing the aperture value.

The following provides a detailed description of the embodiments with reference to the accompanying drawings.

< first embodiment >

Referring to fig. 1 to fig. 2, in which fig. 1 is a schematic view of an image capturing device according to a first embodiment of the invention, and fig. 2 is a graph of spherical aberration, astigmatism and distortion in the first embodiment from left to right. As shown in fig. 1, the image capturing device includes an optical lens assembly (not shown) and an electronic photosensitive element 195. The photographing lens assembly includes, in order from an object side to an image side, a first lens element 110, a second lens element 120, an aperture stop 100, a third lens element 130, a fourth lens element 140, a fifth lens element 150, a sixth lens element 160, a seventh lens element 170, a Filter element (Filter)180, and an image plane 190. Wherein, the electron photosensitive element 195 is disposed on the image forming surface 190. The optical photographing lens group includes seven lenses (110, 120, 130, 140, 150, 160, 170), and there is no other lens interposed between the lenses.

The first lens element 110 with positive refractive power has a concave object-side surface 111 at a paraxial region thereof and a convex image-side surface 112 at a paraxial region thereof, and is aspheric, the object-side surface 111 has an inflection point, the image-side surface 112 has an inflection point, the object-side surface 111 has a critical point at an off-axis region thereof, and the image-side surface 112 has a critical point at an off-axis region thereof.

The second lens element 120 with positive refractive power has a convex object-side surface 121 at a paraxial region and a concave image-side surface 122 at a paraxial region, and is made of plastic material.

The third lens element 130 with positive refractive power has a concave object-side surface 131 at a paraxial region and a convex image-side surface 132 at a paraxial region, and is made of plastic material.

The fourth lens element 140 with negative refractive power has a concave object-side surface 141 at a paraxial region and a convex image-side surface 142 at a paraxial region, and both surfaces are aspheric, the object-side surface 141 has two inflection points, and the image-side surface 142 has one inflection point, wherein a maximum effective radius of the image-side surface 142 is closer to the object side than a center of the image-side surface 142.

The fifth lens element 150 with negative refractive power has a concave object-side surface 151 at a paraxial region and a convex image-side surface 152 at a paraxial region, and is made of plastic material, wherein both surfaces are aspheric, the object-side surface 151 has an inflection point, and the image-side surface 152 has an inflection point.

The sixth lens element 160 with positive refractive power has an object-side surface 161 being convex at a paraxial region thereof and an image-side surface 162 being convex at a paraxial region thereof, and is aspheric, wherein the object-side surface 161 has two inflection points, the image-side surface 162 has four inflection points, the object-side surface 161 has a critical point at an off-axis region thereof, and the image-side surface 162 has two critical points at the off-axis region thereof.

The seventh lens element 170 with negative refractive power has a convex object-side surface 171 at a paraxial region and a concave image-side surface 172 at a paraxial region, and is aspheric, the object-side surface 171 has three inflection points, the image-side surface 172 has two inflection points, the object-side surface 171 has two critical points at an off-axis region, and the image-side surface 172 has a critical point at an off-axis region.

The filter element 180 is made of glass, and is disposed between the seventh lens element 170 and the image plane 190, and does not affect the focal length of the optical photographing lens assembly.

The curve equation of the aspherical surface of each lens described above is as follows:

x: the distance between a point on the aspheric surface, which is Y away from the optical axis, and the relative distance between the point and a tangent plane tangent to the intersection point on the aspheric surface optical axis;

y: the perpendicular distance between a point on the aspheric curve and the optical axis;

r: a radius of curvature;

k: the cone coefficient; and

ai: the ith order aspheric coefficients.

In the first embodiment of the present disclosure, the focal length of the optical photographing lens assembly is f, the aperture value of the optical photographing lens assembly is Fno, and half of the maximum viewing angle in the optical photographing lens assembly is HFOV, and the values thereof are as follows: f 3.91 mm, Fno 2.05, HFOV 49.8 degrees (deg.).

The abbe number of the first lens 110 is V1, the refractive index of the first lens 110 is N1, and the following conditions are satisfied: V1/N1 ═ 28.55.

The abbe number of the second lens 120 is V2, the refractive index of the second lens 120 is N2, and the following conditions are satisfied: V2/N2 ═ 36.26.

The abbe number of the third lens 130 is V3, the refractive index of the third lens 130 is N3, and the following conditions are satisfied: V3/N3 ═ 36.26.

The abbe number of the fourth lens 140 is V4, and the abbe number of the fifth lens 150 is V5, which satisfy the following conditions: v4+ V5-46.6.

The abbe number of the fourth lens 140 is V4, the refractive index of the fourth lens 140 is N4, and the following conditions are satisfied: V4/N4 is 10.91.

The abbe number of the fifth lens 150 is V5, the refractive index of the fifth lens 150 is N5, and the following conditions are satisfied: V5/N5 ═ 17.80.

The abbe number of the sixth lens 160 is V6, the refractive index of the sixth lens 160 is N6, and the following conditions are satisfied: V6/N6 ═ 36.26.

The abbe number of the seventh lens 170 is V7, the refractive index of the seventh lens 170 is N7, and the following conditions are satisfied: V7/N7 ═ 36.26.

The sum of the distances between two adjacent lenses in the optical photographing lens assembly is Σ AT, and the distance between the second lens 120 and the third lens 130 is T23, which satisfies the following conditions: Σ AT/T23 ═ 3.53. In this embodiment, the distance between two adjacent lenses on the optical axis refers to the air distance between two adjacent lenses on the optical axis. In the present embodiment, Σ AT is the sum of the separation distances on the optical axis between any two adjacent lenses among the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, and the seventh lens 170.

The sum of the lens thicknesses of the lenses in the optical photographing lens group on the optical axis is Σ CT, and the sum of the spacing distances between every two adjacent lenses in the optical photographing lens group on the optical axis is Σ AT, which satisfies the following conditions: Σ CT/Σ AT ═ 2.38. In the present embodiment, Σ CT is the sum of the thicknesses of the first lens element 110, the second lens element 120, the third lens element 130, the fourth lens element 140, the fifth lens element 150, the sixth lens element 160, and the seventh lens element 170 on the optical axis.

The thickness of the second lens element 120 on the optical axis is CT2, the distance between the first lens element 110 and the second lens element 120 on the optical axis is T12, which satisfies the following conditions: CT2/T12 is 26.38.

The thickness of the fifth lens element 150 on the optical axis is CT5, and the distance between the fifth lens element 150 and the sixth lens element 160 on the optical axis is T56, which satisfies the following conditions: CT5/T56 is 8.07.

The distance from the aperture stop 100 to the image plane 190 on the optical axis is SL, and the distance from the object-side surface 111 of the first lens element to the image plane 190 on the optical axis is TL, which satisfy the following conditions: SL/TL is 0.87.

The distance TL from the object-side surface 111 to the image plane 190 on the optical axis satisfies the following condition: TL 6.03 mm.

The distance TL from the object-side surface 111 of the first lens element to the image plane 190 on the optical axis is, the entrance pupil aperture of the photographing optical lens assembly is EPD, and the following conditions are satisfied: TL/EPD 3.16.

The distance TL from the object-side surface 111 of the first lens element to the image plane 190 on the optical axis and the focal length f of the photographing optical lens assembly satisfy the following conditions: TL/f is 1.54.

The distance TL from the object-side surface 111 of the first lens element to the image plane 190 on the optical axis is, the maximum image height of the photographing optical lens assembly is ImgH, and the following conditions are satisfied: TL/ImgH is 1.29.

The distance between the object-side surface 111 of the first lens element and the image plane 190 on the optical axis is TL, the maximum image height of the optical photographing lens assembly is ImgH, and half of the maximum view angle in the optical photographing lens assembly is HFOV, which satisfies the following conditions: TL/ImgH + cot (hfov) ═ 2.13.

The radius of curvature of the first lens object side surface 111 is R1, and the focal length of the photographing optical lens group is f, which satisfies the following conditions: r1/f-0.72.

A radius of curvature of the object-side surface 131 of the third lens element is R5, and a radius of curvature of the image-side surface 132 of the third lens element is R6, which satisfy the following conditions: (R5+ R6)/(R5-R6) ═ 1.21.

A radius of curvature of the fifth lens object-side surface 151 is R9, and a radius of curvature of the fifth lens image-side surface 152 is R10, which satisfy the following conditions: R9/R10 is 0.33.

The focal length of the optical photographing lens group is f, the focal length of the first lens 110 is f1, and the following conditions are satisfied: f/f1 is 0.02.

The focal length of the optical photographing lens group is f, and the focal length of the second lens 120 is f2, which satisfies the following conditions: f/f2 is 0.50.

The focal length of the optical photographing lens group is f, and the focal length of the fourth lens 140 is f4, which satisfies the following conditions: f/f4 is-0.54.

The focal length of the optical photographing lens group is f, and the focal length of the seventh lens 170 is f7, which satisfies the following conditions: f/f7 is-1.21.

The optical photographic lens group has a focal length f, a radius of curvature of the object-side surface 111 of the first lens element is R1, a radius of curvature of the image-side surface 112 of the first lens element is R2, and the following conditions are satisfied: f/| R1| + f/| R2| -2.78.

The focal length of the optical photographing lens assembly is f, and the combined focal length of the first lens 110 and the second lens 120 is f12, which satisfies the following conditions: f12/f is 1.88.

The focal length of the second lens 120 is f2, and the focal length of the third lens 130 is f3, which satisfies the following conditions: f2/f3 equals 1.58.

The focal length of the optical photographing lens group is f, and the focal length of the fifth lens 150 is f5, which satisfies the following conditions: f 5/f-1.79.

The focal length of the optical photographing lens group is f, and the focal length of the sixth lens 160 is f6, which satisfies the following conditions: i f6/f i 0.65.

The maximum effective radius of the image-side surface 172 of the seventh lens element is Y72, and the focal length of the photographing optical lens assembly is f, which satisfies the following condition: y72/f is 0.98.

The maximum effective radius of the seventh lens element image-side surface 172 is Y72, and the axial distance between the first lens element object-side surface 111 and the seventh lens element image-side surface 172 is TD, which satisfies the following condition: Y72/TD is 0.81.

The maximum effective radius of the first lens object-side surface 111 is Y11, and the maximum effective radius of the seventh lens image-side surface 172 is Y72, which satisfy the following conditions: Y72/Y11 equals 2.23.

The vertical distance between the optical axis and the critical point of the first lens object-side surface 111 is Yc11, the maximum effective radius of the first lens object-side surface 111 is Y11, and the following conditions are satisfied: yc11/Y11 equals 0.70.

A vertical distance between a critical point of the image-side surface 172 of the seventh lens element and the optical axis is Yc72, and a maximum effective radius of the image-side surface 172 of the seventh lens element is Y72, which satisfies the following condition: yc72/Y72 equals 0.45.

Please refer to the following table one and table two.

The first embodiment shows detailed structural data of the first embodiment in fig. 1, wherein the unit of the radius of curvature, the thickness and the focal length is millimeters (mm), and the surfaces 0 to 18 sequentially represent the surfaces from the object side to the image side. Table two shows the aspheric data of the first embodiment, where k is the cone coefficient in the aspheric curve equation, and a4 to a20 represent the 4 th to 20 th order aspheric coefficients of each surface. In addition, the following tables of the embodiments correspond to the schematic diagrams and aberration graphs of the embodiments, and the definitions of the data in the tables are the same as those of the first and second tables of the first embodiment, which will not be described herein.

< second embodiment >

Referring to fig. 3 to 4, wherein fig. 3 is a schematic view of an image capturing apparatus according to a second embodiment of the invention, and fig. 4 is a graph of spherical aberration, astigmatism and distortion of the second embodiment in order from left to right. As shown in fig. 3, the image capturing device includes an optical lens assembly (not shown) and an electronic photosensitive element 295. The photographing lens assembly includes, in order from an object side to an image side, a first lens element 210, a second lens element 220, an aperture stop 200, a third lens element 230, a fourth lens element 240, a fifth lens element 250, a sixth lens element 260, a seventh lens element 270, a filter element 280 and an image plane 290. The electron sensor 295 is disposed on the image plane 290. The optical photography lens group includes seven lenses (210, 220, 230, 240, 250, 260, 270) without other intervening lenses between the lenses.

The first lens element 210 with positive refractive power has a concave object-side surface 211 at a paraxial region and a convex image-side surface 212 at a paraxial region, both surfaces are aspheric, the object-side surface 211 has an inflection point, the image-side surface 212 has an inflection point, the object-side surface 211 has a critical point at an off-axis region, and the image-side surface 212 has a critical point at an off-axis region.

The second lens element 220 with positive refractive power has a convex object-side surface 221 at a paraxial region and a concave image-side surface 222 at a paraxial region, and is made of plastic material.

The third lens element 230 with positive refractive power has a convex object-side surface 231 at a paraxial region thereof and a convex image-side surface 232 at a paraxial region thereof, and is aspheric, and has an inflection point on the object-side surface 231 and a critical point on the object-side surface 231 at an off-axis region thereof.

The fourth lens element 240 with negative refractive power has a concave object-side surface 241 at a paraxial region and a convex image-side surface 242 at a paraxial region, both surfaces are aspheric, the object-side surface 241 has two inflection points, the image-side surface 242 has an inflection point, and a maximum effective radius of the image-side surface 242 is closer to the object side than a center of the image-side surface 242.

The fifth lens element 250 with negative refractive power has a concave object-side surface 251 and a convex image-side surface 252 at a paraxial region, and both surfaces are aspheric, and the object-side surface 251 and the image-side surface 252 have two inflection points.

The sixth lens element 260 with positive refractive power has a convex object-side surface 261 and a convex image-side surface 262 at a paraxial region, and is aspheric, wherein the object-side surface 261 has two inflection points, the image-side surface 262 has five inflection points, the object-side surface 261 has a critical point at an off-axis, and the image-side surface 262 has two critical points at the off-axis.

The seventh lens element 270 with negative refractive power has a convex object-side surface 271 with a concave image-side surface 272 with a concave surface at a paraxial region, and both surfaces thereof are aspheric, the object-side surface 271 has two inflection points, the image-side surface 272 has two inflection points, the object-side surface 271 has two critical points at an off-axis region, and the image-side surface 272 has a critical point at an off-axis region.

The filter element 280 is made of glass, and is disposed between the seventh lens element 270 and the image plane 290, and does not affect the focal length of the optical photographing lens assembly.

Please refer to the following table three and table four.

In the second embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the definitions described in the following table are the same as those in the first embodiment, and are not repeated herein.

< third embodiment >

Referring to fig. 5 to 6, wherein fig. 5 is a schematic view of an image capturing apparatus according to a third embodiment of the invention, and fig. 6 is a graph of spherical aberration, astigmatism and distortion of the third embodiment in order from left to right. As shown in fig. 5, the image capturing device includes an optical lens assembly (not shown) and an electronic photosensitive element 395. The photographing lens assembly includes, in order from an object side to an image side, a first lens element 310, a second lens element 320, an aperture stop 300, a third lens element 330, a stop 301, a fourth lens element 340, a fifth lens element 350, a sixth lens element 360, a seventh lens element 370, a filter element 380, and an image plane 390. The electron photosensitive element 395 is disposed on the image plane 390. The optical photography lens group comprises seven lenses (310, 320, 330, 340, 350, 360, 370), and no other intervening lenses are between the lenses.

The first lens element 310 with negative refractive power has a concave object-side surface 311 and a convex image-side surface 312, both surfaces being aspheric, the object-side surface 311 has an inflection point, the image-side surface 312 has an inflection point, the object-side surface 311 has a critical point at an off-axis, and the image-side surface 312 has a critical point at an off-axis.

The second lens element 320 with positive refractive power has a convex object-side surface 321 at a paraxial region and a concave image-side surface 322 at a paraxial region, and is aspheric, the object-side surface 321 has an inflection point, and the image-side surface 322 has an inflection point.

The third lens element 330 with positive refractive power has a convex object-side surface 331 at a paraxial region and a convex image-side surface 332 at a paraxial region, and is aspheric, and the object-side surface 331 has an inflection point and the object-side surface 331 has a critical point at an off-axis region.

The fourth lens element 340 with negative refractive power has a concave object-side surface 341 at a paraxial region and a convex image-side surface 342 at a paraxial region, and both surfaces are aspheric, and the image-side surface 342 has an inflection point where a maximum effective radius of the image-side surface 342 is closer to the object side than a center of the image-side surface 342.

The fifth lens element 350 with negative refractive power has a concave object-side surface 351 at a paraxial region and a convex image-side surface 352 at a paraxial region, and is aspheric, and has two inflection points on the object-side surface 351 and two inflection points on the image-side surface 352.

The sixth lens element 360 with positive refractive power has a convex object-side surface 361 at a paraxial region thereof and a convex image-side surface 362 at a paraxial region thereof, and is aspheric, the object-side surface 361 has two inflection points, the image-side surface 362 has four inflection points, the object-side surface 361 has a critical point at an off-axis region thereof, and the image-side surface 362 has two critical points at the off-axis region thereof.

The seventh lens element 370 with negative refractive power has a convex object-side surface 371 at a paraxial region and a concave image-side surface 372 at a paraxial region, both surfaces thereof are aspheric, the object-side surface 371 has two inflection points, the image-side surface 372 has four inflection points, the object-side surface 371 has two critical points at an off-axis region, and the image-side surface 372 has a critical point at an off-axis region.

The filter element 380 is made of glass, and is disposed between the seventh lens element 370 and the image plane 390 without affecting the focal length of the optical photographing lens assembly.

Please refer to table five and table six below.

In the third embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the definitions described in the following table are the same as those in the first embodiment, and are not repeated herein.

< fourth embodiment >

Referring to fig. 7 to 8, wherein fig. 7 is a schematic view of an image capturing apparatus according to a fourth embodiment of the invention, and fig. 8 is a graph of spherical aberration, astigmatism and distortion in the fourth embodiment from left to right. As shown in fig. 7, the image capturing device includes an optical photographing lens assembly (not numbered) and an electro-optic sensor 495. The photographing lens assembly includes, in order from an object side to an image side, a first lens element 410, a second lens element 420, an aperture stop 400, a third lens element 430, a stop 401, a fourth lens element 440, a fifth lens element 450, a sixth lens element 460, a seventh lens element 470, a filter element 480 and an image plane 490. The electro-optic device 495 is disposed on the image plane 490. The group of optical photographing lenses includes seven lenses (410, 420, 430, 440, 450, 460, 470) with no other intervening lenses between the lenses.

The first lens element 410 with negative refractive power has a concave object-side surface 411 at a paraxial region and a convex image-side surface 412 at a paraxial region, and is aspheric, wherein the object-side surface 411 has an inflection point, the image-side surface 412 has an inflection point, the object-side surface 411 has a critical point at an off-axis region, and the image-side surface 412 has a critical point at an off-axis region.

The second lens element 420 with positive refractive power has a convex object-side surface 421 at a paraxial region and a concave image-side surface 422 at a paraxial region, and is aspheric, the object-side surface 421 has an inflection point, the image-side surface 422 has an inflection point, and the image-side surface 422 has a critical point at an off-axis region.

The third lens element 430 with positive refractive power has a planar object-side surface 431 at a paraxial region thereof and a convex image-side surface 432 at a paraxial region thereof, and is made of plastic material.

The fourth lens element 440 with negative refractive power has a concave object-side surface 441 at a paraxial region and a concave image-side surface 442 at a paraxial region, both surfaces are aspheric, the object-side surface 441 has an inflection point, the image-side surface 442 has two inflection points, the image-side surface 442 has a critical point at an off-axis region, and a maximum effective radius position of the image-side surface 442 is closer to the object side than a center of the image-side surface 442.

The fifth lens element 450 with negative refractive power has a concave object-side surface 451 at a paraxial region and a concave image-side surface 452 at a paraxial region, both surfaces are aspheric, and the image-side surface 452 has three inflection points and the image-side surface 452 has a critical point at an off-axis region.

The sixth lens element 460 with positive refractive power has a convex object-side surface 461 at a paraxial region and a convex image-side surface 462 at a paraxial region, and is aspheric, the object-side surface 461 has two inflection points, the image-side surface 462 has three inflection points, the object-side surface 461 has a critical point at an off-axis region, and the image-side surface 462 has two critical points at the off-axis region.

The seventh lens element 470 with negative refractive power has a convex object-side surface 471 at a paraxial region thereof, a concave image-side surface 472 at a paraxial region thereof, both surfaces thereof being aspheric, the object-side surface 471 having two inflection points, the image-side surface 472 having an inflection point, the object-side surface 471 having two critical points at an off-axis region thereof, and the image-side surface 472 having a critical point at an off-axis region thereof.

The filter 480 is made of glass, and is disposed between the seventh lens element 470 and the image plane 490, and does not affect the focal length of the optical photographing lens assembly.

Please refer to table seven and table eight below.

In the fourth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the definitions described in the following table are the same as those in the first embodiment, and are not repeated herein.

< fifth embodiment >

Referring to fig. 9 to 10, fig. 9 is a schematic view of an image capturing apparatus according to a fifth embodiment of the invention, and fig. 10 is a graph of spherical aberration, astigmatism and distortion of the fifth embodiment in order from left to right. As shown in fig. 9, the image capturing device includes an optical lens assembly (not shown) and an electronic sensor 595. The photographing lens assembly includes, in order from an object side to an image side, a first lens 510, a stop 501, a second lens 520, an aperture stop 500, a third lens 530, a stop 502, a fourth lens 540, a fifth lens 550, a sixth lens 560, a seventh lens 570, a filter 580, and an image plane 590. The electronic photosensitive element 595 is disposed on the imaging plane 590. The optical photography lens group includes seven lenses (510, 520, 530, 540, 550, 560, 570) and no other intervening lenses between the lenses.

The first lens element 510 with negative refractive power has a concave object-side surface 511 at a paraxial region thereof and a convex image-side surface 512 at a paraxial region thereof, and is aspheric, the object-side surface 511 has an inflection point, the image-side surface 512 has an inflection point, the object-side surface 511 has a critical point at an off-axis region thereof, and the image-side surface 512 has a critical point at an off-axis region thereof.

The second lens element 520 with positive refractive power has a convex object-side surface 521 at a paraxial region and a concave image-side surface 522 at a paraxial region, and is aspheric, and the object-side surface 521 has an inflection point and the image-side surface 522 has an inflection point.

The third lens element 530 with positive refractive power has a concave object-side surface 531 at a paraxial region and a convex image-side surface 532 at a paraxial region, and is made of glass material.

The fourth lens element 540 with negative refractive power has an object-side surface 541 being convex in a paraxial region thereof and an image-side surface 542 being concave in a paraxial region thereof, both surfaces are aspheric, the object-side surface 541 has an inflection point, the image-side surface 542 has two inflection points, the object-side surface 541 has a critical point in an off-axis region thereof, the image-side surface 542 has a critical point in an off-axis region thereof, and a maximum effective radius of the image-side surface 542 is closer to the object side than a center of the image-side surface 542 thereof.

The fifth lens element 550 with negative refractive power has a concave object-side surface 551 at a paraxial region and a convex image-side surface 552 at a paraxial region, and both surfaces are aspheric, and the object-side surface 551 has an inflection point and the image-side surface 552 has an inflection point.

The sixth lens element 560 with positive refractive power has a concave object-side surface 561 at a paraxial region and a convex image-side surface 562 at a paraxial region, and is made of plastic material, wherein both surfaces are aspheric, the object-side surface 561 has two inflection points, and the image-side surface 562 has two inflection points.

The seventh lens element 570 with negative refractive power has a convex object-side surface 571 at a paraxial region and a concave image-side surface 572 at a paraxial region, which are both aspheric, the object-side surface 571 has two inflection points, the image-side surface 572 has two inflection points, the object-side surface 571 has two critical points at an off-axis region, and the image-side surface 572 has a critical point at an off-axis region.

The filter 580 is made of glass, and is disposed between the seventh lens element 570 and the image plane 590, and does not affect the focal length of the photographing lens assembly.

Please refer to table nine and table ten below.

In the fifth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the definitions described in the following table are the same as those in the first embodiment, and are not repeated herein.

< sixth embodiment >

Referring to fig. 11 to 12, wherein fig. 11 is a schematic view of an image capturing apparatus according to a sixth embodiment of the invention, and fig. 12 is a graph illustrating spherical aberration, astigmatism and distortion in the sixth embodiment from left to right. As shown in fig. 11, the image capturing device includes an optical lens assembly (not shown) and an electronic photosensitive element 695. The photographing lens assembly includes, in order from an object side to an image side, a first lens element 610, a stop 601, a second lens element 620, an aperture stop 600, a third lens element 630, a stop 602, a fourth lens element 640, a fifth lens element 650, a sixth lens element 660, a seventh lens element 670, a filter element 680 and an image plane 690. The electron photosensitive element 695 is disposed on the image plane 690. The optical photography lens group includes seven lenses (610, 620, 630, 640, 650, 660, 670), and no other intervening lenses between the lenses.

The first lens element 610 with negative refractive power has a concave object-side surface 611 at a paraxial region and a convex image-side surface 612 at a paraxial region, and is aspheric, the object-side surface 611 has an inflection point, the image-side surface 612 has an inflection point, the object-side surface 611 has a critical point at an off-axis region, and the image-side surface 612 has a critical point at an off-axis region.

The second lens element 620 with positive refractive power has a convex object-side surface 621 at a paraxial region and a concave image-side surface 622 at a paraxial region, and is aspheric, wherein the object-side surface 621 has an inflection point and the image-side surface 622 has an inflection point.

The third lens element 630 with positive refractive power has an object-side surface 631 being convex in a paraxial region thereof and an image-side surface 632 being convex in a paraxial region thereof, and both surfaces are aspheric, the object-side surface 631 has an inflection point, and the object-side surface 631 has a critical point in an off-axis region thereof.

The fourth lens element 640 with negative refractive power has a concave object-side surface 641 at a paraxial region and a concave image-side surface 642 at a paraxial region, both surfaces are aspheric, the image-side surface 642 has two inflection points, and the image-side surface 642 has a critical point at an off-axis region, and a maximum effective radius of the image-side surface 642 is closer to the object side than a center of the image-side surface 642.

The fifth lens element 650 with negative refractive power has a concave object-side surface 651 at a paraxial region thereof and a convex image-side surface 652 at a paraxial region thereof, and is made of plastic material, wherein both surfaces are aspheric, the object-side surface 651 has an inflection point, and the image-side surface 652 has an inflection point.

The sixth lens element 660 with positive refractive power has a concave object-side surface 661 at a paraxial region, a convex image-side surface 662 at a paraxial region, both surfaces being aspheric, the object-side surface 661 has two inflection points, and the image-side surface 662 has two inflection points.

The seventh lens element 670 with negative refractive power has a convex object-side surface 671 at a paraxial region and a concave image-side surface 672 at a paraxial region, and is aspheric, wherein the object-side surface 671 has two inflection points, the image-side surface 672 has two inflection points, the object-side surface 671 has two off-axis critical points, and the image-side surface 672 has an off-axis critical point.

The filter element 680 is made of glass, and is disposed between the seventh lens element 670 and the image plane 690, and does not affect the focal length of the optical photographing lens assembly.

Please refer to the following table eleven and table twelve.

In the sixth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the definitions described in the following table are the same as those in the first embodiment, and are not repeated herein.

< seventh embodiment >

Referring to fig. 13 to 14, wherein fig. 13 is a schematic view of an image capturing apparatus according to a seventh embodiment of the invention, and fig. 14 is a graph of spherical aberration, astigmatism and distortion of the seventh embodiment in order from left to right. As shown in fig. 13, the image capturing device includes an optical lens assembly (not shown) and an electronic photosensitive element 795. The photographing lens assembly includes, in order from an object side to an image side, a first lens element 710, a stop 701, a second lens element 720, an aperture stop 700, a third lens element 730, a stop 702, a fourth lens element 740, a fifth lens element 750, a sixth lens element 760, a seventh lens element 770, a filter 780, and an image plane 790. The electrophotographic photosensitive member 795 is disposed on the image plane 790. The optical photography lens group includes seven lenses (710, 720, 730, 740, 750, 760, 770), and there are no other intervening lenses between the lenses.

The first lens element 710 with negative refractive power has a concave object-side surface 711 at a paraxial region and a convex image-side surface 712 at a paraxial region, both surfaces are aspheric, the object-side surface 711 has two inflection points, the image-side surface 712 has an inflection point, the object-side surface 711 has a critical point at an off-axis region, and the image-side surface 712 has a critical point at an off-axis region.

The second lens element 720 with positive refractive power has a convex object-side surface 721 at a paraxial region and a concave image-side surface 722 at a paraxial region, and is aspheric, wherein the object-side surface 721 has two inflection points and the image-side surface 722 has two inflection points.

The third lens element 730 with positive refractive power has a convex object-side surface 731 in a paraxial region thereof and a convex image-side surface 732 in a paraxial region thereof, and is aspheric, and has an inflection point on the object-side surface 731 and a critical point on the object-side surface 731 in an off-axis region thereof.

The fourth lens element 740 with negative refractive power is made of plastic material, and has a convex object-side surface 741 at a paraxial region and a concave image-side surface 742 at a paraxial region, wherein both surfaces are aspheric, the object-side surface 741 has an inflection point, the image-side surface 742 has two inflection points, the object-side surface 741 has a critical point at an off-axis region, the image-side surface 742 has a critical point at an off-axis region, and a maximum effective radius of the image-side surface 742 is closer to the object side than a center of the image-side surface 742.

The fifth lens element 750 with negative refractive power has a concave object-side surface 751 at a paraxial region and a convex image-side surface 752 at a paraxial region, and is made of plastic material, wherein both surfaces are aspheric, the object-side surface 751 has an inflection point, and the image-side surface 752 has an inflection point.

The sixth lens element 760 with positive refractive power has a concave object-side surface 761 at a paraxial region and a convex image-side surface 762 at a paraxial region, and is made of plastic material, wherein both surfaces are aspheric, the object-side surface 761 has a inflection point, and the image-side surface 762 has two inflection points.

The seventh lens element 770 with negative refractive power has a convex object-side surface 771 at a paraxial region and a concave image-side surface 772 at a paraxial region, and is made of plastic material, wherein both surfaces are aspheric, the object-side surface 771 has two inflection points, the image-side surface 772 has two inflection points, the object-side surface 771 has two critical points at an off-axis region, and the image-side surface 772 has a critical point at the off-axis region.

The filter 780 is made of glass, and is disposed between the seventh lens element 770 and the image plane 790, and does not affect the focal length of the photographing lens assembly.

Please refer to the following thirteen tables and fourteen tables.

In the seventh embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the definitions described in the following table are the same as those in the first embodiment, and are not repeated herein.

< eighth embodiment >

Referring to fig. 15 to 16, wherein fig. 15 is a schematic view of an image capturing apparatus according to an eighth embodiment of the invention, and fig. 16 is a graph illustrating spherical aberration, astigmatism and distortion in the eighth embodiment from left to right. As shown in fig. 15, the image capturing device includes an optical lens assembly (not shown) and an electronic sensing element 895. The photographing lens assembly includes, in order from an object side to an image side, a first lens element 810, an aperture stop 800, a second lens element 820, a third lens element 830, a stop 801, a fourth lens element 840, a fifth lens element 850, a sixth lens element 860, a seventh lens element 870, a stop 802, a filter element 880, and an image plane 890. The electrophotographic photosensitive member 895 is disposed on the image forming surface 890. The optical photographing lens group includes seven lenses (810, 820, 830, 840, 850, 860, 870) without other interposed lenses between the lenses.

The first lens element 810 with positive refractive power has a concave object-side surface 811 at a paraxial region and a convex image-side surface 812 at a paraxial region, and is aspheric, the object-side surface 811 has an inflection point, the image-side surface 812 has an inflection point, the object-side surface 811 has a critical point at an off-axis region, and the image-side surface 812 has a critical point at an off-axis region.

The second lens element 820 with positive refractive power has a convex object-side surface 821 at a paraxial region and a concave image-side surface 822 at a paraxial region, and is made of plastic material.

The third lens element 830 with positive refractive power has a convex object-side surface 831 at a paraxial region thereof and a convex image-side surface 832 at a paraxial region thereof, and is aspheric, and has an object-side surface 831 having an inflection point and an object-side surface 831 having a critical point at an off-axis region thereof.

The fourth lens element 840 with negative refractive power has a convex object-side surface 841 at a paraxial region and a concave image-side surface 842 at a paraxial region, both surfaces of the fourth lens element being aspheric, the object-side surface 841 has an inflection point, the image-side surface 842 has two inflection points, the object-side surface 841 has a critical point at an off-axis region, the image-side surface 842 has a critical point at an off-axis region, and a maximum effective radius of the image-side surface 842 is closer to the object side than a center of the image-side surface 842.

The fifth lens element 850 with negative refractive power has a concave object-side surface 851 at a paraxial region thereof and a convex image-side surface 852 at a paraxial region thereof, wherein both surfaces are aspheric, the object-side surface 851 has an inflection point, the image-side surface 852 has an inflection point, and the image-side surface 852 has a critical point at an off-axis region thereof.

The sixth lens element 860 with positive refractive power has a concave object-side surface 861 at a paraxial region and a convex image-side surface 862 at a paraxial region, and is made of plastic material, wherein both surfaces are aspheric, the object-side surface 861 has an inflection point, and the image-side surface 862 has an inflection point.

The seventh lens element 870 with negative refractive power has a convex object-side surface 871 in a paraxial region and a concave image-side surface 872 in a paraxial region, both surfaces thereof are aspheric, the object-side surface 871 has two inflection points, the image-side surface 872 has two inflection points, the object-side surface 871 has two critical points in an off-axis region, and the image-side surface 872 has a critical point in the off-axis region.

The filter 880 is made of glass, and is disposed between the seventh lens 870 and the image plane 890, and does not affect the focal length of the optical photographing lens assembly.

Please refer to table fifteen and table sixteen below.

In the eighth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the definitions described in the following table are the same as those in the first embodiment, and are not repeated herein.

< ninth embodiment >

Referring to fig. 17 to fig. 18, wherein fig. 17 is a schematic view of an image capturing apparatus according to a ninth embodiment of the invention, and fig. 18 is a graph illustrating spherical aberration, astigmatism and distortion in the ninth embodiment from left to right. As shown in fig. 17, the image capturing device includes an optical lens assembly (not shown) and an electronic sensing element 995. The photographing lens assembly includes, in order from an object side to an image side, a first lens element 910, an aperture stop 900, a second lens element 920, a third lens element 930, a stop 901, a fourth lens element 940, a fifth lens element 950, a sixth lens element 960, a seventh lens element 970, a filter element 980 and an image plane 990. The electronic photosensitive element 995 is disposed on the image plane 990. The optical photography lens group contains seven lenses (910, 920, 930, 940, 950, 960, 970) with no other intervening lenses between the lenses.

The first lens element 910 with positive refractive power has a concave object-side surface 911 at a paraxial region and a convex image-side surface 912 at a paraxial region, and is aspheric, the object-side surface 911 has an inflection point, the image-side surface 912 has an inflection point, the object-side surface 911 has a critical point at an off-axis region, and the image-side surface 912 has a critical point at an off-axis region.

The second lens element 920 with negative refractive power has an object-side surface 921 being convex in a paraxial region thereof and an image-side surface 922 being concave in the paraxial region thereof.

The third lens element 930 with positive refractive power has a convex object-side surface 931 at a paraxial region thereof, and has a convex image-side surface 932 at a paraxial region thereof, wherein both surfaces are aspheric, and the object-side surface 931 has an inflection point and the object-side surface 931 has a critical point at an off-axis region thereof.

The fourth lens element 940 with negative refractive power has a concave object-side surface 941 at a paraxial region and a concave image-side surface 942 at a paraxial region, both surfaces are aspheric, the image-side surface 942 has two inflection points, the image-side surface 942 has a critical point at an off-axis region, and a maximum effective radius of the image-side surface 942 is closer to the object side than a center of the image-side surface 942.

The fifth lens element 950 with negative refractive power has a concave object-side surface 951 at a paraxial region and a convex image-side surface 952 at a paraxial region, and is made of plastic material, wherein both surfaces are aspheric, the object-side surface 951 has an inflection point, and the image-side surface 952 has an inflection point.

The sixth lens element 960 with positive refractive power has a concave object-side surface 961 at a paraxial region and a convex image-side surface 962 at a paraxial region, and both surfaces are aspheric, the object-side surface 961 has an inflection point and the image-side surface 962 has an inflection point.

The seventh lens element 970 with negative refractive power has a convex object-side surface 971 at a paraxial region and a concave image-side surface 972 at a paraxial region, and is aspheric, wherein the object-side surface 971 has two inflection points, the image-side surface 972 has an inflection point, the object-side surface 971 has a critical point at an off-axis region, and the image-side surface 972 has a critical point at an off-axis region.

The filter element 980 is made of glass, and is disposed between the seventh lens element 970 and the image plane 990, and does not affect the focal length of the optical photographing lens assembly.

Please refer to the following seventeen and eighteen tables.

In the ninth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the definitions described in the following table are the same as those in the first embodiment, and are not repeated herein.

< tenth embodiment >

Referring to fig. 19 to 20, wherein fig. 19 is a schematic view of an image capturing apparatus according to a tenth embodiment of the invention, and fig. 20 is a graph showing spherical aberration, astigmatism and distortion in the ninth embodiment from left to right. As shown in fig. 19, the image capturing device includes an optical lens assembly (not shown) and an electronic photosensitive element 1095. The photographing lens assembly includes, in order from an object side to an image side, a first lens element 1010, an aperture stop 1000, a second lens element 1020, a third lens element 1030, a stop 1001, a fourth lens element 1040, a fifth lens element 1050, a sixth lens element 1060, a seventh lens element 1070, a filter element 1080, and an image plane 1090. The electron sensor 1095 is disposed on the image plane 1090. The optical photography lens group includes seven lenses (1010, 1020, 1030, 1040, 1050, 1060, 1070), and no other intervening lenses between the lenses.

The first lens element 1010 with positive refractive power has a concave object-side surface 1011 at a paraxial region thereof and a convex image-side surface 1012 at a paraxial region thereof, and is aspheric, the object-side surface 1011 has an inflection point, the image-side surface 1012 has an inflection point, the object-side surface 1011 has a critical point at an off-axis region thereof, and the image-side surface 1012 has a critical point at an off-axis region thereof.

The second lens element 1020 with positive refractive power has an object-side surface 1021 being convex in a paraxial region thereof and an image-side surface 1022 being concave in the paraxial region thereof, and is made of plastic material.

The third lens element 1030 with positive refractive power has a convex object-side surface 1031 at a paraxial region and a convex image-side surface 1032 at a paraxial region, and is aspheric, the object-side surface 1031 has an inflection point, and the object-side surface 1031 has a critical point at an off-axis region.

The fourth lens element 1040 with positive refractive power has a convex object-side surface 1041 at a paraxial region and a concave image-side surface 1042 at a paraxial region, both surfaces are aspheric, the object-side surface 1041 has an inflection point, the image-side surface 1042 has two inflection points, the object-side surface 1041 has a critical point at an off-axis region, the image-side surface 1042 has a critical point at an off-axis region, and a maximum effective radius of the image-side surface 1042 is closer to the object side than a center of the image-side surface 1042.

The fifth lens element 1050 with negative refractive power has a concave object-side surface 1051 at a paraxial region and a convex image-side surface 1052 at a paraxial region, and both surfaces are aspheric, and the object-side surface 1051 has an inflection point and the image-side surface 1052 has an inflection point.

The sixth lens element 1060 with positive refractive power has a concave object-side surface 1061 at a paraxial region and a convex image-side surface 1062 at a paraxial region, and both surfaces are aspheric, and the object-side surface 1061 and the image-side surface 1062 have inflection points.

The seventh lens element 1070 with negative refractive power has a convex object-side surface 1071 at a paraxial region thereof and a concave image-side surface 1072 at a paraxial region thereof, both surfaces thereof being aspheric, the object-side surface 1071 thereof having two inflection points, the image-side surface 1072 thereof having an inflection point, the object-side surface 1071 thereof having a critical point at an off-axis region thereof, and the image-side surface 1072 thereof having a critical point at an off-axis region thereof.

The filter 1080 is made of glass, and is disposed between the seventh lens 1070 and the image plane 1090, and does not affect the focal length of the optical photographing lens assembly.

Please refer to the nineteen and twenty tables below.

In the tenth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the definitions described in the following table are the same as those in the first embodiment, and are not repeated herein.

< eleventh embodiment >

Referring to fig. 21, fig. 21 is a perspective view of an image capturing apparatus according to an eleventh embodiment of the invention. In the present embodiment, the image capturing device 10 is a camera module. The image capturing device 10 includes an imaging lens 11, a driving device 12, an electronic sensor 13, and an image stabilizing module 14. The imaging lens 11 includes the optical photographing lens group of the first embodiment, a lens barrel (not otherwise numbered) for carrying the optical photographing lens group, and a Holder Member (not otherwise numbered). The image capturing device 10 focuses light by using the imaging lens 11 to generate an image, and performs image focusing by cooperating with the driving device 12, and finally forms an image on the electronic photosensitive element 13 and can output the image as image data.

The driving device 12 may have an Auto-Focus (Auto-Focus) function, and the driving method thereof may use a driving system such as a Voice Coil Motor (VCM), a Micro Electro-Mechanical system (MEMS), a Piezoelectric system (piezo-electric), and a Memory metal (Shape Memory Alloy). The driving device 12 can make the imaging lens 11 obtain a better imaging position, and can provide a clear image for the subject in the state of different object distances. In addition, the image capturing device 10 carries an electronic photosensitive device 13 (such as a CMOS, a CCD) with good sensitivity and low noise to be disposed on the image plane of the photographing lens assembly, so as to truly present the good image quality of the photographing lens assembly.

The image stabilization module 14 is, for example, an accelerometer, a gyroscope or a Hall Effect Sensor. The driving device 12 can be used as an Optical anti-shake device (Optical Image Stabilization, OIS) together with the Image Stabilization module 14, and compensates a blurred Image caused by shaking at the moment of shooting by adjusting the variation of the imaging lens 11 in different axial directions, or provides an Electronic anti-shake function (Electronic Image Stabilization, EIS) by using an Image compensation technology in Image software, so as to further improve the imaging quality of shooting of dynamic and low-illumination scenes.

< twelfth embodiment >

Referring to fig. 22 to 24, wherein fig. 22 is a perspective view of an electronic device according to a twelfth embodiment of the disclosure, fig. 23 is a perspective view of another side of the electronic device of fig. 22, and fig. 24 is a system block diagram of the electronic device of fig. 22.

In this embodiment, the electronic device 20 is a smart phone. The electronic device 20 includes the Image capturing device 10, the Image capturing device 10a, the Image capturing device 10b, the flash module 21, the focusing auxiliary module 22, an Image Signal Processor 23(Image Signal Processor), a user interface 24 and an Image software Processor 25 of the eleventh embodiment. The image capturing device 10, the image capturing device 10a and the image capturing device 10b face the same direction and are all single focus. The

image capturing devices

10a and 10b have similar configurations as the image capturing device 10. In detail, the image capturing device 10a and the image capturing device 10b respectively include an imaging lens, a driving device, an electronic sensor and an image stabilizing module. The imaging lenses of the image capturing device 10a and the image capturing device 10b respectively include a lens group, a lens barrel for carrying the lens group, and a supporting device.

The image capturing device 10, the image capturing device 10a and the image capturing device 10b of the present embodiment have different viewing angles (wherein, the image capturing device 10 is a wide-angle device, the image capturing device 10a is a telescopic device, and the viewing angle of the image capturing device 10b can be between the image capturing device 10a and the image capturing device 10), so that the electronic device can provide different magnifications to achieve the photographing effect of optical zooming. The electronic device 20 includes a plurality of

image capturing devices

10, 10a, 10b as an example, but the number and arrangement of the image capturing devices are not intended to limit the present invention.

When a user shoots a subject 26, the electronic device 20 utilizes the image capturing device 10, the image capturing device 10a, or the image capturing device 10b to collect light for image capturing, starts the flash module 21 to supplement light, performs fast focusing using the object distance information of the subject 26 provided by the focusing auxiliary module 22, and performs image optimization processing by the image signal processor 23 to further improve the quality of an image generated by the optical lens for image capturing. The focus assist module 22 may employ an infrared or laser focus assist system to achieve rapid focus. The user interface 24 may employ a touch screen or a physical shooting button, and perform image shooting and image processing in cooperation with various functions of the image software processor 25. The images processed by the image software processor 25 may be displayed on the user interface 24.

The image capturing device 10 of the present invention is not limited to be applied to a smart phone. The image capturing device 10 can be applied to a mobile focusing system according to the requirement, and has the characteristics of excellent aberration correction and good imaging quality. For example, the image capturing device 10 can be applied to electronic devices such as three-dimensional (3D) image capturing, digital cameras, mobile devices, tablet computers, smart televisions, network monitoring equipment, driving recorders, back-up developing devices, multi-lens devices, identification systems, motion sensing game machines, wearable devices, and the like. The electronic device is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the image capturing device of the present invention.

Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. An optical photographing lens assembly comprising seven lens elements, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element, wherein the seven lens elements respectively have an object side surface facing the object side and an image side surface facing the image side, the lens elements of the optical photographing lens assembly are respectively composed of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element, the object side surface of the first lens element is concave at a paraxial region, the object side surface of the first lens element is aspheric and has at least one critical point at an off-axis region, the third lens element has positive refractive power, and the fifth lens element surface is concave at the paraxial region;

wherein a sum of distances between each two adjacent lenses in the photographing optical lens assembly is Σ AT, a distance between the second lens and the third lens is T23, a focal length of the photographing optical lens assembly is f, a focal length of the sixth lens is f6, and a distance between the object-side surface of the first lens and an imaging surface on the optical axis is TL, which satisfies the following conditions:

2.20<ΣAT/T23<12.5；

l f6/f < 0.90; and

2.5 mm < TL <8.5 mm.

2. The optical photographing lens assembly of claim 1, wherein at least one surface of each of at least three lenses of the optical photographing lens assembly is aspheric and has at least one inflection point, the sixth lens element has positive refractive power, the image-side surface of the sixth lens element is convex at a paraxial region, the focal length of the optical photographing lens assembly is f, and the focal length of the sixth lens element is f6, which satisfy the following conditions:

0.40<|f6/f|<0.80。

3. the optical photographing lens assembly of claim 1, wherein the abbe number of the fourth lens is V4, and the abbe number of the fifth lens is V5, which satisfy the following conditions:

20.0<V4+V5<70.0。

4. the photographing lens assembly of claim 1, wherein a sum of lens thicknesses of the lenses in the photographing lens assembly on an optical axis is Σ CT, and a sum of distances separating each two adjacent lenses in the photographing lens assembly on the optical axis is Σ AT, which satisfies the following condition:

2.0<ΣCT/ΣAT<3.0。

5. the optical photographing lens assembly of claim 1, wherein the second lens element has an optical thickness CT2, the first lens element is separated from the second lens element by an optical distance T12, the second lens element has a focal length f2, and the third lens element has a focal length f3, which satisfies the following conditions:

10.0< CT2/T12< 100; and

0.30<f2/f3<5.0。

6. the photographing lens assembly of claim 1, wherein an axial distance between the object-side surface of the first lens element and the image plane is TL, a focal length of the photographing lens assembly is f, an entrance pupil aperture of the photographing lens assembly is EPD, a radius of curvature of the object-side surface of the first lens element is R1, a radius of curvature of the image-side surface of the first lens element is R2, and wherein:

1.40<TL/f<1.70；

2.2< TL/EPD < 4.0; and

2.0<f/|R1|+f/|R2|。

7. the optical photographing lens assembly of claim 1, further comprising an aperture stop, wherein the aperture stop is disposed between the first lens element and the third lens element, an axial distance from the aperture stop to the image plane is SL, an axial distance from an object-side surface of the first lens element to the image plane is TL, and the following conditions are satisfied:

0.80<SL/TL<0.94。

8. the photographing lens assembly of claim 1, wherein the image-side surface of the first lens element is convex at a paraxial region thereof, the image-side surface of the first lens element is aspheric and has at least one critical point at an off-axis region thereof, the fifth lens element has negative refractive power, and the image-side surface of the fifth lens element is convex at a paraxial region thereof.

9. The optical photographing lens assembly of claim 1, wherein the second lens element with positive refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region, a focal length of the optical photographing lens assembly is f, and a focal length of the second lens element is f2, wherein:

0.15<f/f2<0.80。

10. the photographing lens assembly of claim 1, wherein the image-side surface of the third lens element is convex at a paraxial region, the fourth lens element has negative refractive power, the radius of curvature of the object-side surface of the third lens element is R5, and the radius of curvature of the image-side surface of the third lens element is R6, wherein:

-0.25<(R5+R6)/(R5-R6)<3.5。

11. the optical photographing lens assembly of claim 1, wherein the seventh lens element image-side surface is concave at a paraxial region thereof, the seventh lens element image-side surface is aspheric and has at least one critical point at an off-axis region thereof, the seventh lens element image-side surface has a maximum effective radius Y72, an axial distance between the object-side surface and the seventh lens element image-side surface is TD, and a vertical distance between the critical point and the optical axis of the seventh lens element image-side surface is Yc72, satisfying the following criteria:

0.65< Y72/TD < 1.2; and

0.35<Yc72/Y72<0.70。

12. an image capturing device, comprising:

an optical photography lens group according to claim 1; and

an electronic photosensitive element is arranged on the imaging surface of the optical photographic lens group.

13. An electronic device, comprising:

the image capturing apparatus of claim 12.

14. An optical photographing lens assembly comprising seven lens elements, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element, wherein the seven lens elements respectively have an object side surface facing the object side and an image side surface facing the image side, the lens elements of the optical photographing lens assembly are respectively composed of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element, the object side surface of the first lens element is a concave surface at a paraxial region, the object side surface of the first lens element is an aspheric surface and has at least one critical point at an off-axis region, the object side surface of the fifth lens element is a concave surface at a paraxial region, and the seventh lens element has negative refractive power;

wherein a sum of distances between two adjacent lenses in the photographing optical lens assembly is Σ AT, a distance between the second lens and the third lens is T23, a focal length of the photographing optical lens assembly is f, and a focal length of the sixth lens is f6, and the following conditions are satisfied:

2.20< Σ AT/T23< 7.10; and

|f6/f|<0.90。

15. the photographing lens assembly of claim 14, wherein a sum of distances separating each two adjacent lenses in the photographing lens assembly on an optical axis is Σ AT, a distance separating the second lens and the third lens on the optical axis is T23, a focal length of the photographing lens assembly is f, a focal length of the fourth lens is f4, and a focal length of the sixth lens is f6, and satisfies the following conditions:

2.50<ΣAT/T23<5.50；

0.40< | f6/f | < 0.80; and

-1.0<f/f4<0.60。

16. the photographing optical lens assembly of claim 14, wherein a distance TL from the object-side surface of the first lens to an image plane is on an optical axis, a maximum image height of the photographing optical lens assembly is ImgH, and half of a maximum angle of view in the photographing optical lens assembly is HFOV, which satisfies the following conditions:

4.0 mm < TL <7.0 mm;

0.80< TL/ImgH < 1.45; and

1.20<TL/ImgH+cot(HFOV)<2.40；

wherein an abbe number of the first lens is V1, an abbe number of the second lens is V2, an abbe number of the third lens is V3, an abbe number of the fourth lens is V4, an abbe number of the fifth lens is V5, an abbe number of the sixth lens is V6, an abbe number of the seventh lens is V7, an abbe number of the ith lens is Vi, a refractive index of the first lens is N1, a refractive index of the second lens is N2, a refractive index of the third lens is N3, a refractive index of the fourth lens is N4, a refractive index of the fifth lens is N5, a refractive index of the sixth lens is N6, a refractive index of the seventh lens is N7, a refractive index of the ith lens is Ni, and at least one lens of the optical photographic lens group satisfies the following conditions:

Vi/Ni <12.0, where i ═ 1, 2, 3, 4, 5, 6, or 7.

17. The photographing lens assembly of claim 14, wherein the first lens element has a convex image-side surface at a paraxial region, the seventh lens element has a convex object-side surface at a paraxial region, the seventh lens element has an aspheric object-side surface and at least one critical point at an off-axis region, the first lens element has a radius of curvature of R1, the photographing lens assembly has a focal length of f, and the seventh lens element has a maximum effective radius of Y72, satisfying the following conditions:

-1.30< R1/f < 0; and

0.80<Y72/f<1.10。

18. an optical photographing lens assembly comprising seven lens elements, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element, wherein the seven lens elements respectively have an object side surface facing the object side and an image side surface facing the image side, the lens elements of the optical photographing lens assembly are respectively composed of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element, the object side surface of the first lens element is a concave surface at a paraxial region, the object side surface of the first lens element is an aspheric surface and has at least one critical point at an off-axis region, the image side surface of the first lens element is a convex surface at a paraxial region, and the third lens element has positive refractive power;

wherein a sum of distances between each two adjacent lenses in the photographing optical lens assembly is Σ AT, a distance between the second lens and the third lens on the optical axis is T23, a distance between the fifth lens and the sixth lens on the optical axis is T56, a focal length of the photographing optical lens assembly is f, a focal length of the fourth lens is f4, a focal length of the fifth lens is f5, and a thickness of the fifth lens on the optical axis is CT5, and satisfies the following conditions:

1.20<ΣAT/T23<90.0；

-24.0<f5/f<0；

1.80< CT 5/T56; and

-0.80<f/f4<0.30。

19. the optical photographing lens assembly of claim 18, wherein the sum of the distances separating each two adjacent lenses in the optical photographing lens assembly on the optical axis is Σ AT, and the distance separating the second lens and the third lens on the optical axis is T23, which satisfies the following condition:

2.20<ΣAT/T23<7.10。

20. the photographing lens assembly of claim 18, wherein the focal length of the photographing lens assembly is f, the focal length of the fifth lens element is f5, the thickness of the fifth lens element along the optical axis is CT5, and the distance between the fifth lens element and the sixth lens element along the optical axis is T56, wherein the following conditions are satisfied:

-6.0< f5/f < 0; and

2.50<CT5/T56<100。

21. the optical photographing lens assembly of claim 18, wherein the abbe number of the fourth lens is V4, and the abbe number of the fifth lens is V5, which satisfy the following conditions:

20.0<V4+V5<70.0。

22. the optical photographing lens assembly of claim 18, wherein the second lens element has an optical thickness CT2, and the first lens element and the second lens element are separated by an optical distance T12, which satisfies the following condition:

10.0<CT2/T12<100。

23. the optical photographing lens assembly of claim 18, wherein the radius of curvature of the object-side surface of the third lens element is R5, the radius of curvature of the image-side surface of the third lens element is R6, the focal length of the optical photographing lens assembly is f, the focal length of the first lens element is f1, the vertical distance between the critical point of the object-side surface of the first lens element and the optical axis is Yc11, and the maximum effective radius of the object-side surface of the first lens element is Y11, wherein the following conditions are satisfied:

-0.25<(R5+R6)/(R5-R6)<3.5；

-0.50< f/f1< 0.40; and

0.50<Yc11/Y11<0.80。

24. the optical photographing lens assembly of claim 18, wherein the radius of curvature of the object-side surface of the fifth lens element is R9, and the radius of curvature of the image-side surface of the fifth lens element is R10, satisfying the following condition:

-0.30<R9/R10<0.70。

25. the optical photographing lens assembly of claim 18, wherein the focal length of the optical photographing lens assembly is f, and the combined focal length of the first lens element and the second lens element is f12, satisfying the following condition:

0<f12/f<5.0。

26. the photographing lens assembly of claim 18, wherein at least one surface of each of at least two lenses in the photographing lens assembly is aspheric and has at least one critical point at an off-axis, an aperture value of the photographing lens assembly is Fno, half of a maximum viewing angle in the photographing lens assembly is HFOV, a maximum effective radius of an object-side surface of the first lens is Y11, and a maximum effective radius of an image-side surface of the seventh lens is Y72, wherein the following conditions are satisfied:

1.20<Fno<2.40；

45.0 degrees < HFOV <55.0 degrees; and

1.80<Y72/Y11<2.80。

27. the optical photographing lens assembly of claim 18, wherein the second lens element has positive refractive power, the fourth lens element has negative refractive power, the maximum effective radius position of the image-side surface of the fourth lens element is closer to the object side than the center of the image-side surface of the fourth lens element, the sixth lens element has positive refractive power, the focal length of the first lens element is f1, the focal length of the second lens element is f2, the focal length of the third lens element is f3, the focal length of the fourth lens element is f4, the focal length of the fifth lens element is f5, the focal length of the sixth lens element is f6, the focal length of the seventh lens element is f7, and the focal length of the i lens element is fi, which satisfy the following conditions:

i f6| <ifi |, where i ═ 1, 2, 3, 4, 5, 7.

28. The photographing lens assembly of claim 18, wherein the seventh lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region, the image-side surface of the seventh lens element is aspheric and has at least one critical point at an off-axis region, a focal length of the photographing lens assembly is f, and the focal length of the seventh lens element is f7, satisfying the following conditions:

-3.0<f/f7<-0.50。

29. an image capturing device, comprising:

an optical photography lens group according to claim 18; and

an electronic photosensitive element is arranged on an imaging surface of the optical photographing lens group.

30. An electronic device, comprising:

the image capturing device as claimed in claim 29.