Optical image acquisition system, image taking device and electronic device

Abstract

An optical image acquisition system, an image capturing device and an electronic device are disclosed. The optical image acquisition system includes six lenses. The six lenses are sequentially arranged along an optical path from an object side to an image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The six 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 has a negative refractive power, and the object side surface thereof is concave at a vicinity of an optical axis. The image side surface of the second lens is concave at the vicinity of the optical axis. The fourth lens has a negative refractive power. The image side surface of the sixth lens is concave at the vicinity of the optical axis, and the image side surface of the sixth lens has at least one critical point at an off-axis position. When certain conditions are met, the optical image acquisition system can simultaneously meet the requirements of wide viewing angle, miniaturization and high imaging quality. The image capturing device has the above-mentioned optical image acquisition system, and the electronic device has the above-mentioned image capturing device.

Description

Technical Field

[0001] The present invention relates to an optical image capturing system, an image capturing apparatus and an electronic device, in particular to an optical image capturing system and an image capturing apparatus suitable for electronic devices. Background Art

[0002] As semiconductor process technologies become more advanced, the performance of electronic photosensitive elements is improved, and pixels can reach a more compact size. Therefore, optical lenses with high imaging quality have become an indispensable part.

[0003] With the rapid advancement of technology, the application scope of electronic devices equipped with optical lenses has become more extensive, and the requirements for optical lenses are also more diversified. Since conventional optical lenses are difficult to strike a balance among the requirements such as imaging quality, sensitivity, aperture size, volume or field of view, the present invention provides an optical lens to meet the requirements. Contents of the Invention

[0004] The present invention provides an optical image capturing system, an image capturing apparatus and an electronic device. The optical image capturing system includes six lenses arranged in sequence from an object side to an image side along an optical axis. When specific conditions are satisfied, the optical image capturing system provided by the present invention can simultaneously meet the requirements of wide field of view, miniaturization and high imaging quality.

[0005] The present invention provides an optical image capturing system, including six lenses. The six lenses are, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. Each of the six lenses has an object side surface facing the object side direction and an image side surface facing the image side direction. The first lens has negative refractive power, and the object side surface thereof is concave at a paraxial region. The image side surface of the second lens is concave at a paraxial region. The fourth lens has negative refractive power. The image side surface of the sixth lens is concave at a paraxial region, and the image side surface of the sixth lens has at least one critical point at an off-axis region. The Abbe number of the sixth lens is V6, the focal length of the optical image capturing system is f, the radius of curvature of the object side surface of the fourth lens is R7, the radius of curvature of the image side surface of the fourth lens is R8, the thickness of the fourth lens on the optical axis is CT4, and the separation distance between the fourth lens and the fifth lens on the optical axis is T45, which satisfy the following conditions:

[0006] 10.0<V6<44.0;

[0007] -1.6<f / R7+f / R8<0.10; and

[0008] 0<CT4 / T45<1.6.

[0009] This invention also provides an optical image acquisition system comprising six lenses. The six lenses, arranged sequentially from the object side to the image side along the optical path, are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Each of the six lenses has an object-side surface facing the object side and an image-side surface facing the image side. The first lens has negative refractive power, and its object-side surface is concave near the optical axis. The second lens has an image-side surface concave near the optical axis. The fourth lens has negative refractive power. The sixth lens has an image-side surface concave near the optical axis, and its image-side surface has at least one critical point off-axis. The Abbe number of the sixth lens is V6, the focal length of the optical image acquisition system is f, the radius of curvature of the object-side surface of the fourth lens is R7, the radius of curvature of the image-side surface of the fourth lens is R8, the thickness of the fourth lens along the optical axis is CT4, and the distance between the fourth and fifth lenses along the optical axis is T45, satisfying the following conditions:

[0010] 10.0 <V6<44.0;

[0011] f / R7 + f / R8 < 0.10; and

[0012] 0.65 <CT4 / T45<1.6。

[0013] The present invention provides an image acquisition device, which includes the aforementioned optical image acquisition system and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on the imaging surface of the optical image acquisition system.

[0014] The present invention provides an electronic device comprising the aforementioned image capturing device.

[0015] When V6 meets the above conditions, the material of the sixth lens can be adjusted to correct aberrations such as chromatic aberration.

[0016] When f / R7+f / R8 meets the above conditions, the surface shape and refractive power of the fourth lens can be adjusted, which helps to achieve a balance between increasing the viewing angle, increasing the imaging surface and compressing the volume.

[0017] When CT4 / T45 meets the above conditions, the fourth lens and the fifth lens can work together to compress the volume.

[0018] In this embodiment of the invention, the first lens has negative refractive power; thereby, the refractive power configuration of the optical image acquisition system can be adjusted, which helps to increase the viewing angle. The object-side surface of the first lens is concave near the optical axis; thereby, it helps to compress the volume of the object-side end of the optical image acquisition system in a wide-viewing-angle configuration. The image-side surface of the second lens is concave near the optical axis; thereby, it helps to correct aberrations such as astigmatism. The fourth lens has negative refractive power; thereby, the refractive power configuration of the optical image acquisition system can be balanced to correct aberrations such as spherical aberration. The image-side surface of the sixth lens is concave near the optical axis; thereby, it helps to adjust the back focal length. The image-side surface of the sixth lens has at least one critical point off-axis; thereby, the incident angle of light on the imaging plane can be adjusted, which helps to correct off-axis aberrations and improve illumination.

[0019] The foregoing description of the invention and the following description of the embodiments are intended to demonstrate and explain the spirit and principles of the invention, and to provide a further explanation of the claims. Attached Figure Description

[0020] Figure 1 A schematic diagram of an image-capturing device according to a first embodiment of the present invention is shown.

[0021] Figure 2 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the first embodiment.

[0022] Figure 3 A schematic diagram of an image-capturing device according to a second embodiment of the present invention is shown.

[0023] Figure 4 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the second embodiment.

[0024] Figure 5 A schematic diagram of an image-capturing device according to a third embodiment of the present invention is shown.

[0025] Figure 6 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the third embodiment.

[0026] Figure 7 A schematic diagram of an image-capturing device according to a fourth embodiment of the present invention is shown.

[0027] Figure 8 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the fourth embodiment.

[0028] Figure 9 A schematic diagram of an image-capturing device according to a fifth embodiment of the present invention is shown.

[0029] Figure 10 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the fifth embodiment.

[0030] Figure 11 A schematic diagram of an image-capturing device according to a sixth embodiment of the present invention is shown.

[0031] Figure 12 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the sixth embodiment.

[0032] Figure 13 A schematic diagram of an image-capturing device according to a seventh embodiment of the present invention is shown.

[0033] Figure 14 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the seventh embodiment.

[0034] Figure 15 A schematic diagram of an imaging device according to the eighth embodiment of the present invention is shown.

[0035] Figure 16 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the eighth embodiment.

[0036] Figure 17 A perspective schematic diagram of an imaging device according to a ninth embodiment of the present invention is shown.

[0037] Figure 18 A perspective view of one side of an electronic device according to a tenth embodiment of the present invention is shown.

[0038] Figure 19 Draw Figure 18 A three-dimensional diagram of the other side of the electronic device.

[0039] Figure 20 Draw Figure 18 System block diagram of an electronic device.

[0040] Figure 21 A perspective view of one side of an electronic device according to the eleventh embodiment of the present invention is shown.

[0041] Figure 22 A perspective view of one side of an electronic device according to the twelfth embodiment of the present invention is shown.

[0042] Figure 23 A schematic diagram illustrating parameters Y11, Yc11, Y61, Yc61, Y62, Yc62, and the inflection point and critical point of a portion of the lens according to the first embodiment of the present invention is shown.

[0043] Figure 24 A schematic diagram illustrating an arrangement of the optical path reversing element according to the present invention in an optical image acquisition system is shown.

[0044] Figure 25A schematic diagram illustrating another configuration of the optical path reversing element according to the present invention in an optical image acquisition system is shown.

[0045] Figure 26 A schematic diagram illustrating an arrangement of two optical path deflection elements in an optical image acquisition system according to the present invention is shown.

[0046] Figure Labels

[0047] 1, 2, 3, 4, 5, 6, 7, 8, 100, 100a, 100b, 100c, 100d, 100e, 100f, 100g, 100h, 100i, 100j, 100k, 100m, 100n, 100p… Image capturing device

[0048] 101… Imaging Lens

[0049] 102… Drive unit

[0050] 103…Electronic photosensitive element

[0051] 104…Image Stabilization Module

[0052] 200, 300, 400… electronic devices

[0053] 201, 301, 401… Flash modules

[0054] 202…Focus Assist Module

[0055] 203…Image Signal Processor

[0056] 204… Display Module

[0057] 205…Image Software Processor

[0058] 206…Subject

[0059] C…critical point

[0060] P…inverted point

[0061] IM… Imaging Surface

[0062] OA1…First Optical Axis

[0063] OA2…Second optical axis

[0064] OA3…Third optical axis

[0065] LF…Optical path switching element

[0066] LF1…First optical path switching element

[0067] LF2…Second optical path switching element

[0068] LG…lens group

[0069] ST…Aperture

[0070] S1, S2... aperture

[0071] E1…First Lens

[0072] E2…Second Lens

[0073] E3…Third Lens

[0074] E4…Fourth Lens

[0075] E5…Fifth Lens

[0076] E6…Sixth Lens

[0077] E7…Filter element

[0078] IMG…Image plane

[0079] IS… Electronic photosensitive element

[0080] Y11…Maximum effective radius of the object-side surface of the first lens

[0081] Yc11… The perpendicular distance between the critical point of the object-side surface of the first lens and the optical axis

[0082] Y61…Maximum effective radius of the object-side surface of the sixth lens

[0083] Yc61… The vertical distance between the critical point on the object-side surface of the sixth lens and the optical axis

[0084] Y62…Maximum effective radius of the image-side surface of the sixth lens

[0085] Yc62… The perpendicular distance between the critical point of the image-side surface of the sixth lens and the optical axis Detailed Implementation

[0086] The optical image acquisition system includes six lenses, which are arranged sequentially from the object side to the image side along the optical path as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Each of the six lenses has an object-side surface facing the object side and an image-side surface facing the image side.

[0087] The first lens has negative refractive power; thereby, the refractive power configuration of the optical image capturing system can be adjusted, which is beneficial to increasing the field of view. The object-side surface of the first lens is concave at the paraxial region; thereby, it is helpful to compress the volume of the object-side end of the optical image capturing system under a wide field of view configuration. The object-side surface of the first lens may have at least one critical point at the off-axis position; thereby, it is beneficial to compress the volume of the object-side end of the optical image capturing system and improve the imaging quality of the wide field of view. Wherein, the vertical distance between the critical point on the object-side surface of the first lens and the optical axis is Yc11, the maximum effective radius of the object-side surface of the first lens is Y11, and the at least one critical point at the off-axis position of the object-side surface of the first lens satisfies the following condition: 0.10<Yc11 / Y11<0.90. Thereby, the volume can be further compressed and the imaging quality can be improved. Please refer to Figure 23 , which is a schematic diagram illustrating the parameters Yc11 and Y11 and the critical point C at the off-axis position of the first lens E1 in the first embodiment according to the present invention.

[0088] The second lens may have positive refractive power; thereby, it is beneficial to compress the volume of the object-side end of the optical image capturing system. The object-side surface of the second lens may be convex at the paraxial region; thereby, it can cooperate with the first lens to help reduce surface reflection. The image-side surface of the second lens is concave at the paraxial region; thereby, it is beneficial to correct aberrations such as astigmatism.

[0089] The third lens may have positive refractive power; thereby, the positive refractive power required for volume compression can be balanced, which is beneficial to reducing sensitivity. The object-side surface of the third lens may be convex at the paraxial region; thereby, it can cooperate with the second lens to correct aberrations. The image-side surface of the third lens may be convex at the paraxial region; thereby, the traveling direction of light rays can be adjusted, which is beneficial to balancing the volume distribution between the object-side end and the image-side end of the optical image capturing system.

[0090] The fourth lens has negative refractive power; thereby, the refractive power configuration of the optical image capturing system can be balanced to correct aberrations such as spherical aberration. The object-side surface of the fourth lens may be concave at the paraxial region; thereby, the traveling direction of light rays can be adjusted, which is beneficial to enlarging the imaging plane.

[0091] The fifth lens may have positive refractive power; thereby, it is beneficial to compress the volume of the image-side end of the optical image capturing system. The image-side surface of the fifth lens may be convex at the paraxial region; thereby, it can cooperate with the sixth lens to correct aberrations.

[0092] The sixth lens may have negative refractive power; thereby, the refractive power at the image side end of the optical image capturing system can be balanced to correct aberrations. The object-side surface of the sixth lens may be convex at the paraxial region; thereby, it is beneficial to adjust the surface shape and refractive power of the sixth lens to correct aberrations. The object-side surface of the sixth lens may have at least one critical point at the off-axis region; thereby, the surface shape of the sixth lens can be adjusted, which is conducive to improving the imaging quality of a wide field of view. Wherein, the vertical distance between the critical point on the object-side surface of the sixth lens and the optical axis is Yc61, the maximum effective radius of the object-side surface of the sixth lens is Y61, and the at least one critical point of the object-side surface of the sixth lens at the off-axis region can satisfy the following condition: 0.10<Yc61 / Y61<0.90; thereby, the imaging quality can be further improved. The image-side surface of the sixth lens is concave at the paraxial region; thereby, it is beneficial to adjust the back focal length. The image-side surface of the sixth lens has at least one critical point at the off-axis region; thereby, the incident angle of light rays on the imaging plane can be adjusted, which is beneficial to correct off-axis aberrations and enhance illumination. Wherein, the vertical distance between the critical point on the image-side surface of the sixth lens and the optical axis is Yc62, the maximum effective radius of the image-side surface of the sixth lens is Y62, and the at least one critical point of the image-side surface of the sixth lens at the off-axis region can satisfy the following condition: 0.10<Yc62 / Y62<0.90; thereby, aberrations can be further corrected. Please refer to Figure 23 , which is a schematic diagram illustrating the parameters Yc61, Y61, Yc62 and Y62 and the critical point C at the off-axis region of the sixth lens E6 according to the first embodiment of the present invention. Figure 23 is an exemplary illustration showing the critical point C at the off-axis region of the object-side surface of the first lens E1 and the sixth lens E6 in the first embodiment of the present invention. However, in this embodiment and other embodiments of the present invention, each lens may also have one or more critical points at the off-axis region.

[0093] In the optical image capturing system disclosed by the present invention, at least two lenses may each have at least one of their object-side surface and image-side surface provided with at least one inflection point at the off-axis region. Thereby, the variation degree of the lens surface can be increased, which is beneficial to correcting aberrations and compressing the lens volume. Wherein, in the optical image capturing system, at least three lenses may each have at least one of their object-side surface and image-side surface provided with at least one inflection point at the off-axis region. Please refer to Figure 23 , which is a schematic diagram illustrating the inflection points P at the off-axis region of the first lens E1, the second lens E2, the fourth lens E4, the fifth lens E5 and the sixth lens E6 according to the first embodiment of the present invention.

[0094] The Abbe number of the sixth lens is V6, which satisfies the following condition: 10.0<V6<44.0. Thereby, the material of the sixth lens can be adjusted to correct aberrations such as chromatic aberration. Wherein, the following condition can also be satisfied: 14.0<V6<40.0.

[0095] The focal length of the optical image capturing system is f, the radius of curvature of the object-side surface of the fourth lens is R7, and the radius of curvature of the image-side surface of the fourth lens is R8, which satisfies the following condition: f / R7+f / R8<0.10. Accordingly, the surface profile and refractive power of the fourth lens can be adjusted, which helps achieve a balance between increasing the field of view, enlarging the imaging surface and reducing the volume. Herein, the following condition can also be satisfied: -2.0<f / R7+f / R8<0.10. Herein, the following condition can also be satisfied: -1.6<f / R7+f / R8<0.10. Herein, the following condition can also be satisfied: -1.4<f / R7+f / R8<0.

[0096] The thickness of the fourth lens on the optical axis is CT4, and the separation distance between the fourth lens and the fifth lens on the optical axis is T45, which satisfies the following condition: 0<CT4 / T45<1.6. Accordingly, the fourth lens and the fifth lens can cooperate with each other to reduce the volume. Herein, the following condition can also be satisfied: 0.35<CT4 / T45<1.6. Herein, the following condition can also be satisfied: 0.65<CT4 / T45<1.6. Herein, the following condition can also be satisfied: 0.70≤CT4 / T45<1.4.

[0097] The Abbe number of the first lens is V1, the Abbe number of the second lens is V2, the Abbe number of the third lens is V3, the Abbe number of the fourth lens is V4, the Abbe number of the fifth lens is V5, and the Abbe number of the sixth lens is V6, which can satisfy the following condition: 2.0<(V1+V3+V5) / (V2+V4+V6)<3.0. Accordingly, the material distribution of the optical image capturing system can be adjusted to correct chromatic aberration.

[0098] The thickness of the first lens on the optical axis is CT1, and the thickness of the second lens on the optical axis is CT2, which can satisfy the following condition: 0.74≤CT1 / CT2<2.5. Accordingly, the first lens and the second lens can cooperate with each other, which helps reduce the volume of the object-side end of the optical image capturing system.

[0099] The separation distance between the fourth lens and the fifth lens on the optical axis is T45, and the separation distance between the fifth lens and the sixth lens on the optical axis is T56, which can satisfy the following condition: 4.0<T45 / T56<18. Accordingly, the lens distribution at the image-side end of the optical image capturing system can be adjusted to reduce the volume of the image-side end.

[0100] The thickness of the first lens on the optical axis is CT1, and the separation distance between the first lens and the second lens on the optical axis is T12, which can satisfy the following condition: 0.35<CT1 / T12<1.5. Accordingly, the first lens and the second lens can cooperate with each other, which helps increase the field of view.

[0101] The thickness of the second lens on the optical axis is CT2, the thickness of the third lens on the optical axis is CT3, and the separation distance between the second lens and the third lens on the optical axis is T23, which can satisfy the following condition: 2.0<(CT2+CT3) / T23<5.8. Thereby, the second lens and the third lens can cooperate with each other, which helps to achieve a balance between the aperture size and the volume distribution.

[0102] The thickness of the second lens on the optical axis is CT2, and the separation distance between the fifth lens and the sixth lens on the optical axis is T56, which can satisfy the following condition: 3.3<CT2 / T56<19. Thereby, the lens distribution can be adjusted, which helps to reduce the total length. In addition, the following condition can also be satisfied: 5.1<CT2 / T56<17.

[0103] The radius of curvature of the image-side surface of the second lens is R4, and the radius of curvature of the object-side surface of the third lens is R5, which can satisfy the following condition: 0.42≤R4 / R5<1.7. Thereby, the surface shapes of the second lens and the third lens can cooperate with each other to correct aberrations.

[0104] The separation distance between the third lens and the fourth lens on the optical axis is T34, and the separation distance between the fifth lens and the sixth lens on the optical axis is T56, which can satisfy the following condition: 1.1<T34 / T56<10. Thereby, the lens distribution can be adjusted, which helps to achieve a balance among the field of view, the volume and the imaging quality.

[0105] The focal length of the optical image capturing system is f, and the radius of curvature of the image-side surface of the first lens is R2, which can satisfy the following condition: -0.14<f / R2<0.80. Thereby, the surface shape and refractive power of the first lens can be adjusted, which helps to increase the field of view.

[0106] The radius of curvature of the object-side surface of the first lens is R1, and the radius of curvature of the image-side surface of the first lens is R2, which can satisfy the following condition: -5.3<R1 / R2<0.90. Thereby, the surface shape of the first lens can be adjusted, which helps to increase the field of view and correct aberrations. In addition, the following condition can also be satisfied: -3.0<R1 / R2<0.60. In addition, the following condition can also be satisfied: -2.4<R1 / R2<0.30.

[0107] The radius of curvature of the object-side surface of the second lens is R3, and the radius of curvature of the image-side surface of the second lens is R4, which can satisfy the following condition: -9.0<(R3+R4) / (R3-R4)<0. Thereby, the surface shape of the second lens can be adjusted, which helps to adjust the optical path to improve the image quality.

[0108] The focal length of the optical image capturing system is f, and the radius of curvature of the object-side surface of the first lens is R1, which can satisfy the following condition: -1.5<f / R1<-0.40. Accordingly, the surface shape and refractive power of the first lens can be adjusted, which is beneficial to increasing the field of view and compressing the lens volume. Wherein, the following condition can also be satisfied: -1.2<f / R1≤-0.80.

[0109] The focal length of the optical image capturing system is f, 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, and the focal length of the sixth lens is f6, which can satisfy at least one of the following conditions: 0.25<|f / f1|<1.0; |f / f2|<0.60; 0.45<|f / f3|<1.2; |f / f4|<0.60; 0.35<|f / f5|<1.8; and |f / f6|<1.6. Accordingly, the refractive power distribution of the optical image capturing system can be adjusted, which is beneficial to increasing the field of view, compressing the volume and correcting aberrations.

[0110] The focal length of the optical image capturing system is f, and the combined focal length of the first lens and the second lens is f12, which can satisfy the following condition: f12 / f<0. Accordingly, the first lens and the second lens can cooperate with each other to increase the field of view. Wherein, the following condition can also be satisfied: f12 / f<-2.2.

[0111] Half of the maximum field of view in the optical image capturing system is HFOV, which can satisfy the following condition: 50.0 degrees<HFOV<80.0 degrees. Accordingly, the optical image capturing system can have the characteristic of a wide field of view, and aberrations such as distortion caused by an excessively large field of view can be avoided. Wherein, the following condition can also be satisfied: 55.0 degrees<HFOV<70.0 degrees.

[0112] The F-number of the optical image capturing system is Fno, which can satisfy the following condition: 1.5<Fno<2.4. Accordingly, a balance can be achieved between illumination and depth of field.

[0113] The maximum image height of the optical image capturing system is ImgH (which can be half of the total diagonal length of the effective sensing area of the electronic photosensitive element), and the distance on the optical axis from the object-side surface of the first lens to the image plane is TL, which can satisfy the following condition: 1.2<TL / ImgH<2.1. Accordingly, a balance can be achieved between the total length and the size of the image plane.

[0114] The maximum effective radius of the object-side surface of the first lens is Y11, and the maximum effective radius of the image-side surface of the sixth lens is Y62, which can satisfy the following condition: 0.60<Y62 / Y11<1.6. Accordingly, the ratio of the outer diameters of the lenses can be adjusted, which is beneficial to achieving a balance among the field of view, volume distribution and image plane size. Please refer to Figure 23This is a schematic diagram illustrating parameters Y11 and Y62 according to the first embodiment of the present invention.

[0115] The various technical features in the optical image acquisition system of the present invention can be combined and configured to achieve the corresponding effects.

[0116] In the optical image acquisition system disclosed in this invention, the lens can be made of glass or plastic. If the lens is made of glass, the freedom of refractive power configuration in the optical image acquisition system can be increased, and the influence of external environmental temperature changes on imaging can be reduced. Glass lenses can be manufactured using techniques such as grinding or molding. If the lens is made of plastic, production costs can be effectively reduced. Furthermore, spherical or aspherical (ASP) surfaces can be provided on the lens surface. Spherical lenses reduce manufacturing difficulty, while aspherical surfaces provide more controllable variables to reduce aberrations, decrease the number of lenses, and effectively reduce the overall length of the optical image acquisition system of this invention. Further, aspherical surfaces can be manufactured using methods such as plastic injection molding or molding glass lenses.

[0117] In the optical image acquisition system disclosed in this invention, if the lens surface is aspherical, it means that all or part of the optically effective area of ​​the lens surface is aspherical.

[0118] In the optical image acquisition system disclosed in this invention, additives can be selectively added to any (or more) lens materials to produce light absorption or interference effects, thereby altering the lens's transmittance for specific wavelengths of light and reducing stray light and color shift. For example, the additives can filter out light in the 600 nm to 800 nm wavelength range to help reduce excess red or infrared light; or they can filter out light in the 350 nm to 450 nm wavelength range to reduce excess blue or ultraviolet light. Therefore, the additives can prevent specific wavelengths of light from interfering with imaging. Furthermore, the additives can be uniformly mixed into plastic and manufactured into lenses using injection molding technology. Additionally, the additives can also be deposited on the lens surface to provide the aforementioned effects.

[0119] In the optical image acquisition system disclosed in this invention, if the lens surface is convex and its position is not defined, it means that the convex surface can be located near the optical axis of the lens surface; if the lens surface is concave and its position is not defined, it means that the concave surface can be located near the optical axis of the lens surface. If the refractive power or focal length of the lens is not defined in its region, it means that the refractive power or focal length of the lens can be the refractive power or focal length of the lens near the optical axis.

[0120] In the optical image acquisition system disclosed in this invention, the inflection point of the lens surface refers to the boundary point where the curvature of the lens surface changes from positive to negative. The critical point of the lens surface refers to the point of tangency on the tangent line between a plane perpendicular to the optical axis and the lens surface, and the critical point is not located on the optical axis.

[0121] In the optical image acquisition system disclosed in this invention, the imaging surface of the optical image acquisition system can be a plane or a curved surface with any curvature, depending on the corresponding electronic photosensitive element, especially a curved surface with a concave surface facing the object side.

[0122] In the optical image acquisition system disclosed in this invention, one or more imaging correction elements (such as planar elements) can be selectively disposed between the lens closest to the imaging surface and the imaging surface in the imaging optical path to achieve the effect of correcting image curvature (e.g., image bending). The optical properties of the imaging correction element, such as curvature, thickness, refractive index, position, and surface type (convex or concave, spherical or aspherical, diffractive surface, and Fresnel surface, etc.), can be adjusted according to the requirements of the imaging device. Generally, a preferred configuration of the imaging correction element is to place a thin plano-concave element with a concave surface in the object-side direction close to the imaging surface.

[0123] In the optical image acquisition system disclosed in this invention, at least one element with a deflecting optical path function, such as a prism or a mirror, can be selectively arranged between the object and the imaging surface in the imaging optical path. This provides a more flexible spatial configuration for the optical image acquisition system, allowing the thinner and lighter electronic device to be independent of the overall optical length of the optical image acquisition system. For further explanation, please refer to... Figure 24 and Figure 25 ,in Figure 24 This is a schematic diagram illustrating an arrangement of the optical path reversing element according to the present invention in an optical image acquisition system, and Figure 25 This is a schematic diagram illustrating another configuration of the optical path reversing element according to the present invention in an optical image acquisition system. For example... Figure 24 and Figure 25 As shown, the optical image acquisition system can travel along the optical path from the subject (not shown) to the imaging plane IM, and sequentially includes a first optical axis OA1, an optical path deflection element LF, and a second optical axis OA2, wherein the optical path deflection element LF can be as follows: Figure 24 The image shown is positioned between the subject and the lens group LG of the optical image acquisition system, or as... Figure 25 The diagram shows the lens group LG positioned between the lens array LG and the imaging plane IM in an optical image acquisition system. Please also refer to... Figure 26 This is a schematic diagram illustrating an arrangement of two optical path deflection elements according to the present invention in an optical image acquisition system, such as... Figure 26As shown, the optical image acquisition system can also follow the optical path from the subject (not shown) to the imaging plane IM, and sequentially includes a first optical axis OA1, a first optical path reversing element LF1, a second optical axis OA2, a second optical path reversing element LF2, and a third optical axis OA3. The first optical path reversing element LF1 is disposed between the subject and the lens group LG of the optical image acquisition system, and the second optical path reversing element LF2 is disposed between the lens group LG of the optical image acquisition system and the imaging plane IM. The optical image acquisition system can also selectively be configured with more than three optical path reversing elements. This invention is not limited to the type, number, and position of the optical path reversing elements disclosed in the accompanying drawings.

[0124] In the optical image acquisition system disclosed in this invention, at least one aperture stop may be provided, which may be located in front of the first lens, between the lenses, or after the last lens. The aperture stop may be of the type such as a glare stop or a field stop, which can be used to reduce stray light and help improve image quality.

[0125] In the optical image acquisition system disclosed in this invention, the aperture can be configured as a front aperture or a central aperture. A front aperture means the aperture is positioned between the subject and the first lens, while a central aperture means the aperture is positioned between the first lens and the imaging plane. A front aperture allows for a longer distance between the exit pupil and the imaging plane, resulting in a telecentric effect and increasing the efficiency of image reception by the CCD or CMOS sensor. A central aperture helps to expand the field of view of the optical image acquisition system.

[0126] This invention may appropriately incorporate a variable aperture element, which can be a mechanical component or a light-regulating element, and whose aperture size and shape can be controlled electrically or by electrical signals. The mechanical component may include movable parts such as a blade assembly or a shielding plate; the light-regulating element may include a filter element, an electrochromic material, a liquid crystal layer, or other shielding material. This variable aperture element can enhance image adjustment capabilities by controlling the amount of light entering the image or the exposure time. Furthermore, this variable aperture element can also be the aperture of this invention, allowing image quality, such as depth of field or exposure speed, to be adjusted by changing the aperture value.

[0127] Based on the above implementation methods, specific embodiments are presented below and described in detail with reference to the accompanying drawings.

[0128] <First Embodiment>

[0129] Please refer to Figures 1 to 2 ,in Figure 1 A schematic diagram of an image-capturing device according to a first embodiment of the present invention is shown. Figure 2 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the first embodiment. Figure 1 It is known that the image acquisition device 1 includes an optical image acquisition system (unlabeled) and an electronic photosensitive element IS. The optical image acquisition system, along the optical path from the object side to the image side, sequentially includes a first lens E1, a second lens E2, an aperture ST, a third lens E3, an aperture stop S1, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter element E7, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG. The optical image acquisition system includes six lenses (E1, E2, E3, E4, E5, E6), and there are no other interposed lenses between the lenses.

[0130] The first lens E1 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has two inflection points off-axis, its image-side surface has two inflection points off-axis, and its object-side surface has a critical point off-axis.

[0131] The second lens E2 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both surfaces are aspherical, and its object-side surface has an inflection point off-axis.

[0132] The third lens E3 has positive refractive power and is made of glass. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical.

[0133] The fourth lens E4 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is flat near the optical axis. Both surfaces are aspherical, and its image-side surface has an inflection point off-axis.

[0134] The fifth lens E5 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has one inflection point off-axis, and its image-side surface has four inflection points off-axis.

[0135] The sixth lens E6 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both surfaces are aspherical. Its object-side surface has two inflection points off-axis, and its image-side surface has two inflection points off-axis. Its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0136] The filter element E7 is made of glass and is located between the sixth lens E6 and the imaging surface IMG. It does not affect the focal length of the optical image acquisition system.

[0137] The equations for the aspherical surfaces of the above lenses are expressed as follows:

[0138]

[0139] X: The displacement parallel to the optical axis from the intersection of the aspherical surface and the optical axis to a point on the aspherical surface at a distance Y from the optical axis;

[0140] Y: The perpendicular distance between a point on the aspherical curve and the optical axis;

[0141] R: Radius of curvature;

[0142] k: cone coefficient; and

[0143] Ai: The i-th order aspherical coefficient.

[0144] In the optical image acquisition system of the first embodiment, the focal length of the optical image acquisition system is f, the aperture value of the optical image acquisition system is Fno, and half of the maximum field of view of the optical image acquisition system is HFOV, with the following values: f = 1.94 mm, Fno = 2.19, HFOV = 60.0 degrees.

[0145] The Abbe number of the first lens E1 is V1, the Abbe number of the second lens E2 is V2, the Abbe number of the third lens E3 is V3, the Abbe number of the fourth lens E4 is V4, the Abbe number of the fifth lens E5 is V5, and the Abbe number of the sixth lens E6 is V6. They satisfy the following condition: (V1+V3+V5) / (V2+V4+V6)=2.65.

[0146] The Abbe number of the sixth lens E6 is V6, which satisfies the following condition: V6 = 26.0.

[0147] The thickness of the second lens E2 on the optical axis is CT2, the thickness of the third lens E3 on the optical axis is CT3, and the distance between the second lens E2 and the third lens E3 on the optical axis is T23, which satisfies the following condition: (CT2+CT3) / T23=3.46. In this embodiment, the distance between two adjacent lenses on the optical axis refers to the distance between two adjacent mirror surfaces of the two adjacent lenses on the optical axis.

[0148] The thickness of the first lens E1 along the optical axis is CT1, and the thickness of the second lens E2 along the optical axis is CT2, which satisfies the following condition: CT1 / CT2=1.84.

[0149] The thickness of the first lens E1 on the optical axis is CT1, and the distance between the first lens E1 and the second lens E2 on the optical axis is T12, which satisfies the following condition: CT1 / T12=0.71.

[0150] The thickness of the second lens E2 on the optical axis is CT2, and the distance between the fifth lens E5 and the sixth lens E6 on the optical axis is T56, which satisfies the following condition: CT2 / T56=10.74.

[0151] The thickness of the fourth lens E4 on the optical axis is CT4, and the distance between the fourth lens E4 and the fifth lens E5 on the optical axis is T45, which satisfies the following condition: CT4 / T45=0.59.

[0152] The distance between the third lens E3 and the fourth lens E4 on the optical axis is T34, and the distance between the fifth lens E5 and the sixth lens E6 on the optical axis is T56. They satisfy the following condition: T34 / T56=6.34.

[0153] The distance between the fourth lens E4 and the fifth lens E5 on the optical axis is T45, and the distance between the fifth lens E5 and the sixth lens E6 on the optical axis is T56, which satisfies the following condition: T45 / T56=14.51.

[0154] The distance on the optical axis from the object-side surface of the first lens E1 to the imaging plane IMG is TL, and the maximum imaging height of the optical image acquisition system is ImgH, which satisfies the following condition: TL / ImgH=1.93.

[0155] The radius of curvature of the object-side surface of the second lens E2 is R3, and the radius of curvature of the image-side surface of the second lens E2 is R4, which satisfies the following condition: (R3+R4) / (R3-R4)=-4.74.

[0156] The radius of curvature of the object-side surface of the first lens E1 is R1, and the radius of curvature of the image-side surface of the first lens E1 is R2, which satisfies the following condition: R1 / R2=4.22E-03.

[0157] The radius of curvature of the image-side surface of the second lens E2 is R4, and the radius of curvature of the object-side surface of the third lens E3 is R5, which satisfies the following condition: R4 / R5=0.42.

[0158] The focal length of the optical image acquisition system is f. The focal lengths of the first lens E1 are f1, the second lens E2 are f2, the third lens E3 are f3, the fourth lens E4 are f4, the fifth lens E5 are f5, and the sixth lens E6 are f6, satisfying the following conditions: |f / f1|=0.50; |f / f2|=0.33; |f / f3|=0.71; |f / f4|=0.26; |f / f5|=1.16; and |f / f6|=1.07.

[0159] The focal length of the optical image acquisition system is f, and the radius of curvature of the object-side surface of the first lens E1 is R1, which satisfies the following condition: f / R1=-0.92.

[0160] The focal length of the optical image acquisition system is f, and the radius of curvature of the image-side surface of the first lens E1 is R2, which satisfies the following condition: f / R2=-3.87E-03.

[0161] The focal length of the optical image acquisition system is f, the radius of curvature of the object-side surface of the fourth lens E4 is R7, and the radius of curvature of the image-side surface of the fourth lens E4 is R8, which satisfies the following condition: f / R7+f / R8=-0.37.

[0162] The focal length of the optical image acquisition system is f, and the combined focal length of the first lens E1 and the second lens E2 is f12, which satisfies the following condition: f12 / f = -12.03.

[0163] The maximum effective radius of the object-side surface of the first lens E1 is Y11, and the maximum effective radius of the image-side surface of the sixth lens E6 is Y62, which satisfies the following condition: Y62 / Y11=0.93.

[0164] The vertical distance between the critical point of the object-side surface of the first lens E1 and the optical axis is Yc11, and the maximum effective radius of the object-side surface of the first lens E1 is Y11, which satisfies the following condition: Yc11 / Y11=0.46.

[0165] The perpendicular distance between the critical point of the object-side surface of the sixth lens E6 and the optical axis is Yc61, and the maximum effective radius of the object-side surface of the sixth lens E6 is Y61, which satisfies the following condition: Yc61 / Y61=0.44.

[0166] The vertical distance between the critical point of the image-side surface of the sixth lens E6 and the optical axis is Yc62, and the maximum effective radius of the image-side surface of the sixth lens E6 is Y62, which satisfies the following condition: Yc62 / Y62=0.61.

[0167] Please refer to Table 1 and Table 2 below.

[0168]

[0169]

[0170]

[0171] Table 1 is... Figure 1The first embodiment provides detailed structural data, where the units for radius of curvature, thickness, and focal length are millimeters (mm), and surfaces 0 to 17 sequentially represent surfaces from the object side to the image side. Table 2 shows the aspherical data in the first embodiment, where k is the cone coefficient in the aspherical curve equation, and A4 to A28 represent the 4th to 28th order aspherical coefficients of each surface. Furthermore, the tables for the following embodiments are corresponding schematic diagrams and aberration curves for each embodiment. The definitions of the data in the tables are the same as those in Tables 1 and 2 of the first embodiment, and will not be repeated here.

[0172] <Second Embodiment>

[0173] Please refer to Figures 3 to 4 ,in Figure 3 A schematic diagram of an image-capturing device according to a second embodiment of the present invention is shown. Figure 4 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the second embodiment. Figure 3 It is known that the image acquisition device 2 includes an optical image acquisition system (unlabeled) and an electronic photosensitive element IS. The optical image acquisition system, along the optical path from the object side to the image side, sequentially includes a first lens E1, a second lens E2, an aperture ST, a third lens E3, an aperture stop S1, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter element E7, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG. The optical image acquisition system includes six lenses (E1, E2, E3, E4, E5, E6), and there are no other interposed lenses between each lens.

[0174] The first lens E1 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has two inflection points off-axis, its image-side surface has one inflection point off-axis, and its object-side surface has a critical point off-axis.

[0175] The second lens E2 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both surfaces are aspherical, and its object-side surface has an inflection point off-axis.

[0176] The third lens E3 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical, and its object-side surface has an inflection point off-axis.

[0177] The fourth lens E4 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical, and its image-side surface has two inflection points off-axis.

[0178] The fifth lens E5 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has one inflection point off-axis, and its image-side surface has two inflection points off-axis.

[0179] The sixth lens E6 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has three inflection points off-axis, its image-side surface has one inflection point off-axis, its object-side surface has one critical point off-axis, and its image-side surface has one critical point off-axis.

[0180] The filter element E7 is made of glass and is located between the sixth lens E6 and the imaging surface IMG. It does not affect the focal length of the optical image acquisition system.

[0181] Please refer to Table 3 and Table 4 below.

[0182]

[0183]

[0184]

[0185]

[0186] In the second embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in the table below are the same as in the first embodiment and will not be repeated here.

[0187]

[0188] <Third Embodiment>

[0189] Please refer to Figures 5 to 6 ,in Figure 5 A schematic diagram of an image-capturing device according to a third embodiment of the present invention is shown. Figure 6 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the third embodiment. Figure 5 It is known that the image acquisition device 3 includes an optical image acquisition system (unlabeled) and an electronic photosensitive element IS. The optical image acquisition system, along the optical path from the object side to the image side, sequentially includes a first lens E1, an aperture stop S1, a second lens E2, an aperture ST, a third lens E3, an aperture stop S2, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter element E7, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG. The optical image acquisition system includes six lenses (E1, E2, E3, E4, E5, E6), and there are no other interposed lenses between each lens.

[0190] The first lens E1 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has two inflection points off-axis, its image-side surface has one inflection point off-axis, and its object-side surface has a critical point off-axis.

[0191] The second lens E2 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection off-axis, and its image-side surface also has a point of inflection off-axis.

[0192] The third lens E3 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical, and its object-side surface has an inflection point off-axis.

[0193] The fourth lens E4 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical, and its image-side surface has two inflection points off-axis.

[0194] The fifth lens E5 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has one inflection point off-axis, and its image-side surface has two inflection points off-axis.

[0195] The sixth lens E6 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has three inflection points off-axis, its image-side surface has one inflection point off-axis, its object-side surface has one critical point off-axis, and its image-side surface has one critical point off-axis.

[0196] The filter element E7 is made of glass and is located between the sixth lens E6 and the imaging surface IMG. It does not affect the focal length of the optical image acquisition system.

[0197] Please refer to Table 5 and Table 6 below.

[0198]

[0199]

[0200]

[0201]

[0202] In the third embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in the table below are the same as in the first embodiment and will not be repeated here.

[0203]

[0204] <Fourth Embodiment>

[0205] Please refer to Figures 7 to 8 ,in Figure 7 A schematic diagram of an image-capturing device according to a fourth embodiment of the present invention is shown. Figure 8 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the fourth embodiment. Figure 7 It is known that the image acquisition device 4 includes an optical image acquisition system (unlabeled) and an electronic photosensitive element IS. The optical image acquisition system, along the optical path from the object side to the image side, sequentially includes a first lens E1, a second lens E2, an aperture ST, a third lens E3, an aperture stop S1, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter element E7, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG. The optical image acquisition system includes six lenses (E1, E2, E3, E4, E5, E6), and there are no other interposed lenses between each lens.

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

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

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

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

[0210] The fifth lens E5 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has three inflection points off-axis, and its image-side surface has two inflection points off-axis.

[0211] The sixth lens E6 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both surfaces are aspherical. Its object-side surface has two inflection points off-axis, and its image-side surface has two inflection points off-axis. Its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0212] The filter element E7 is made of glass and is located between the sixth lens E6 and the imaging surface IMG. It does not affect the focal length of the optical image acquisition system.

[0213] Please refer to Tables 7 and 8 below.

[0214]

[0215]

[0216]

[0217]

[0218] In the fourth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in the table below are the same as in the first embodiment and will not be repeated here.

[0219]

[0220] <Fifth Embodiment>

[0221] Please refer to Figures 9 to 10 ,in Figure 9 A schematic diagram of an image-capturing device according to a fifth embodiment of the present invention is shown. Figure 10 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the fifth embodiment. Figure 9 It is known that the image acquisition device 5 includes an optical image acquisition system (unlabeled) and an electronic photosensitive element IS. The optical image acquisition system, along the optical path from the object side to the image side, sequentially includes a first lens E1, a second lens E2, an aperture ST, a third lens E3, an aperture stop S1, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter element E7, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG. The optical image acquisition system includes six lenses (E1, E2, E3, E4, E5, E6), and there are no other interposed lenses between the lenses.

[0222] The first lens E1 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has two inflection points off-axis, its image-side surface has one inflection point off-axis, and its object-side surface has a critical point off-axis.

[0223] The second lens E2 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection off-axis, and its image-side surface also has a point of inflection off-axis.

[0224] The third lens E3 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical, and its object-side surface has an inflection point off-axis.

[0225] The fourth lens E4 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical, and its image-side surface has two inflection points off-axis.

[0226] The fifth lens E5 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface has one inflection point off-axis, and its image-side surface has two inflection points off-axis.

[0227] The sixth lens E6 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both surfaces are aspherical. Its object-side surface has two inflection points off-axis, and its image-side surface has three inflection points off-axis. Its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0228] The filter element E7 is made of glass and is located between the sixth lens E6 and the imaging surface IMG. It does not affect the focal length of the optical image acquisition system.

[0229] Please refer to Tables 9 and 10 below.

[0230]

[0231]

[0232]

[0233]

[0234] In the fifth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in the table below are the same as in the first embodiment and will not be repeated here.

[0235]

[0236] <Sixth Embodiment>

[0237] Please refer to Figures 11 to 12 ,in Figure 11 A schematic diagram of an image-capturing device according to a sixth embodiment of the present invention is shown. Figure 12 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the sixth embodiment. Figure 11 It is known that the image acquisition device 6 includes an optical image acquisition system (unlabeled) and an electronic photosensitive element IS. The optical image acquisition system, along the optical path from the object side to the image side, sequentially includes a first lens E1, a second lens E2, an aperture ST, a third lens E3, an aperture stop S1, a fourth lens E4, an aperture stop S2, a fifth lens E5, a sixth lens E6, a filter element E7, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG. The optical image acquisition system includes six lenses (E1, E2, E3, E4, E5, E6), and there are no other interposed lenses between the lenses.

[0238] The first lens E1 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection off-axis and a critical point off-axis.

[0239] The second lens E2 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection off-axis, and its image-side surface also has a point of inflection off-axis.

[0240] The third lens E3 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical.

[0241] The fourth lens E4 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both surfaces are aspherical, and its image-side surface has an inflection point off-axis.

[0242] The fifth lens E5 has positive refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both surfaces are aspherical. Its object-side surface has two inflection points off-axis, and its image-side surface also has two inflection points off-axis.

[0243] The sixth lens E6 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both surfaces are aspherical. Its object-side surface has two inflection points off-axis, and its image-side surface has three inflection points off-axis. Its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0244] The filter element E7 is made of glass and is located between the sixth lens E6 and the imaging surface IMG. It does not affect the focal length of the optical image acquisition system.

[0245] Please refer to Table 11 and Table 12 below.

[0246]

[0247]

[0248]

[0249]

[0250] In the sixth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in the table below are the same as in the first embodiment and will not be repeated here.

[0251]

[0252] <Seventh Embodiment>

[0253] Please refer to Figures 13 to 14 ,in Figure 13 A schematic diagram of an image-capturing device according to a seventh embodiment of the present invention is shown. Figure 14 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the seventh embodiment. Figure 13 It is known that the image acquisition device 7 includes an optical image acquisition system (unlabeled) and an electronic photosensitive element IS. The optical image acquisition system, along the optical path from the object side to the image side, sequentially includes a first lens E1, a second lens E2, an aperture ST, a third lens E3, an aperture stop S1, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter element E7, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG. The optical image acquisition system includes six lenses (E1, E2, E3, E4, E5, E6), and there are no other interposed lenses between the lenses.

[0254] The first lens E1 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has one inflection point off-axis, its image-side surface has two inflection points off-axis, and its object-side surface has a critical point off-axis.

[0255] The second lens E2 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both surfaces are aspherical, and its object-side surface has an inflection point off-axis.

[0256] The third lens E3 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical, and its object-side surface has an inflection point off-axis.

[0257] The fourth lens E4 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both surfaces are aspherical, and its image-side surface has an inflection point off-axis.

[0258] The fifth lens E5 has positive refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both surfaces are aspherical. Its object-side surface has two inflection points off-axis, and its image-side surface has four inflection points off-axis.

[0259] The sixth lens E6 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both surfaces are aspherical. Its object-side surface has two inflection points off-axis, its image-side surface has one inflection point off-axis, its object-side surface has one critical point off-axis, and its image-side surface has one critical point off-axis.

[0260] The filter element E7 is made of glass and is located between the sixth lens E6 and the imaging surface IMG. It does not affect the focal length of the optical image acquisition system.

[0261] Please refer to Tables 13 and 14 below.

[0262]

[0263]

[0264]

[0265] In the seventh embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in the table below are the same as in the first embodiment and will not be repeated here.

[0266]

[0267]

[0268] <Eighth Embodiment>

[0269] Please refer to Figures 15 to 16 ,in Figure 15 A schematic diagram of an image-capturing device according to an eighth embodiment of the present invention is shown. Figure 16 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the eighth embodiment. Figure 15 It is known that the image acquisition device 8 includes an optical image acquisition system (unlabeled) and an electronic photosensitive element IS. The optical image acquisition system, along the optical path from the object side to the image side, sequentially includes a first lens E1, an aperture stop S1, a second lens E2, an aperture ST, a third lens E3, an aperture stop S2, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter element E7, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG. The optical image acquisition system includes six lenses (E1, E2, E3, E4, E5, E6), and there are no other interposed lenses between the lenses.

[0270] The first lens E1 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface has a point of inflection off-axis, its image-side surface has a point of inflection off-axis, and its object-side surface has a critical point off-axis.

[0271] The second lens E2 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both surfaces are aspherical, and its object-side surface has an inflection point off-axis.

[0272] The third lens E3 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis. Both of its surfaces are aspherical, and its object-side surface has an inflection point off-axis.

[0273] The fourth lens E4 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is concave near the optical axis. Both of its surfaces are aspherical, and its image-side surface has two inflection points off-axis.

[0274] The fifth lens E5 has positive refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. Both surfaces are aspherical. Its object-side surface has two inflection points off-axis, and its image-side surface also has two inflection points off-axis.

[0275] The sixth lens E6 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both surfaces are aspherical. Its object-side surface has two inflection points off-axis, and its image-side surface has two inflection points off-axis. Its object-side surface has a critical point off-axis, and its image-side surface has a critical point off-axis.

[0276] The filter element E7 is made of glass and is located between the sixth lens E6 and the imaging surface IMG. It does not affect the focal length of the optical image acquisition system.

[0277] Please refer to Tables 15 and 16 below.

[0278]

[0279]

[0280]

[0281] In the eighth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in the table below are the same as in the first embodiment and will not be repeated here.

[0282]

[0283] <Ninth Embodiment>

[0284] Please refer to Figure 17 This is a perspective view illustrating an image-capturing device according to a ninth embodiment of the present invention. In this embodiment, the image-capturing device 100 is a camera module. The image-capturing device 100 includes an imaging lens 101, a driving device 102, an electronic photosensitive element 103, and an image stabilization module 104. The imaging lens 101 includes the optical image acquisition system of the first embodiment described above, a lens barrel (not otherwise labeled) for carrying the optical image acquisition system, and a support device (Holder Member, not otherwise labeled). The imaging lens 101 can also be configured with the optical image acquisition system of other embodiments described above, and the present invention is not limited thereto. The image-capturing device 100 uses the imaging lens 101 to focus light to generate an image, and cooperates with the driving device 102 to focus the image, finally imaging it on the electronic photosensitive element 103 and outputting it as image data.

[0285] The driving device 102 may have an auto-focus function, and its driving method can use a driving system such as a voice coil motor (VCM), microelectromechanical systems (MEMS), piezoelectric systems, and shape memory alloys. The driving device 102 enables the imaging lens 101 to achieve a better imaging position, allowing clear images to be captured of the subject at different object distances. In addition, the image capturing device 100 is equipped with a high-sensitivity and low-noise electronic image sensor 103 (such as CMOS or CCD) located on the imaging surface of the optical image acquisition system, which can truly present the good image quality of the optical image acquisition system.

[0286] The image stabilization module 104 may be, for example, an accelerometer, a gyroscope, or a Hall effect sensor. The drive unit 102 may work in conjunction with the image stabilization module 104 to form an optical image stabilization (OIS) device. By adjusting the changes in different axes of the imaging lens 101, it can compensate for the blurry image caused by shaking during shooting, or use image compensation technology in the imaging software to provide electronic image stabilization (EIS), further improving the image quality of shooting in dynamic and low-light scenes.

[0287] <Tenth Embodiment>

[0288] Please refer to Figures 18 to 20 ,in Figure 18 A perspective view of one side of an electronic device according to a tenth embodiment of the present invention is shown. Figure 19 Draw Figure 18 A three-dimensional diagram of the other side of the electronic device, and Figure 20 Draw Figure 18 System block diagram of an electronic device.

[0289] In this embodiment, the electronic device 200 is a smartphone. The electronic device 200 includes, according to the ninth embodiment, image capturing devices 100, 100a, 100b, 100c, and 100d, a flash module 201, a focus assist module 202, an image signal processor 203, a display module 204, and an image software processor 205. Image capturing devices 100 and 100a are both located on the same side of the electronic device 200 and are both single-focus. The focus assist module 202 may employ a laser rangefinder or a Time-of-Flight (ToF) module, but the present invention is not limited thereto. Image capturing devices 100b, 100c, and 100d, and display module 204 are all disposed on the other side of electronic device 200, and display module 204 can serve as a user interface, allowing image capturing devices 100b, 100c, and 100d to function as front-facing lenses for selfies, but this invention is not limited thereto. Furthermore, image capturing devices 100a, 100b, 100c, and 100d can all include the optical image acquisition system of this invention and can all have a structural configuration similar to that of image capturing device 100. Specifically, each of image capturing devices 100a, 100b, 100c, and 100d can include an imaging lens, a driving device, an electronic photosensitive element, and an image stabilization module. The imaging lenses of imaging devices 100a, 100b, 100c and 100d may each include, for example, an optical lens group of the optical image acquisition system of the present invention, a lens barrel for carrying the optical lens group and a support device.

[0290] Image capturing device 100 is a wide-angle image capturing device, image capturing device 100a is an ultra-wide-angle image capturing device, image capturing device 100b is a wide-angle image capturing device, image capturing device 100c is an ultra-wide-angle image capturing device, and image capturing device 100d is a time-of-flight ranging image capturing device. In this embodiment, image capturing devices 100 and 100a have different viewing angles, allowing the electronic device 200 to provide different magnifications to achieve optical zoom shooting effects. Additionally, image capturing device 100d can acquire the depth signal of the image. The above-described electronic device 200 is exemplified by including multiple image capturing devices 100, 100a, 100b, 100c, and 100d, but the number and configuration of the image capturing devices are not intended to limit the invention.

[0291] When the user photographs the subject 206, the electronic device 200 uses the image capturing device 100 or image capturing device 100a to focus the light, activates the flash module 201 for supplemental lighting, and uses the subject distance signal of the subject 206 provided by the focus assist module 202 for fast focusing. Furthermore, the image signal processor 203 performs image optimization processing to further improve the image quality produced by the optical image acquisition system. The focus assist module 202 can use an infrared or laser focus assist system to achieve fast focusing. In addition, the electronic device 200 can also use the image capturing devices 100b, 100c, or 100d for shooting. The display module 204 can use a touch screen, combined with the diverse functions of the image software processor 205 for image capturing and image processing (or can use a physical shooting button). The image processed by the image software processor 205 can be displayed on the display module 204.

[0292] <Eleventh Embodiment>

[0293] Please refer to Figure 21 This is a perspective view illustrating one side of an electronic device according to the eleventh embodiment of the present invention.

[0294] In this embodiment, the electronic device 300 is a smartphone. The electronic device 300 includes, according to the ninth embodiment, an image capturing device 100, an image capturing device 100e, an image capturing device 100f, a flash module 301, a focus assist module, an image signal processor, a display module, and an image software processor (not shown). Image capturing devices 100, 100e, and 100f are all disposed on the same side of the electronic device 300, while the display module is disposed on the other side. Furthermore, image capturing devices 100e and 100f can both include the optical image acquisition system of the present invention and can both have a similar structural configuration to image capturing device 100, which will not be described in detail here.

[0295] Image capturing device 100 is a wide-angle image capturing device, image capturing device 100e is a telephoto image capturing device, and image capturing device 100f is an ultra-wide-angle image capturing device. In this embodiment, image capturing devices 100, 100e, and 100f have different viewing angles, allowing the electronic device 300 to provide different magnifications to achieve optical zoom shooting effects. Furthermore, image capturing device 100e is a telephoto image capturing device with an optical path deflection element configuration, so that the total length of image capturing device 100e is not limited by the thickness of the electronic device 300. The optical path deflection element configuration of image capturing device 100e can, for example, have a similar... Figures 24 to 26 The structure can be referred to the aforementioned corresponding structure. Figures 24 to 26The description of the above-described electronic device 300 is given as an example, which includes multiple image capturing devices 100, 100e, and 100f, but the number and configuration of the image capturing devices are not intended to limit the present invention. When a user photographs a subject, the electronic device 300 uses image capturing device 100, image capturing device 100e, or image capturing device 100f to focus the light and capture the image, activates the flash module 301 for supplementary lighting, and performs subsequent processing in a manner similar to the aforementioned embodiments, which will not be described in detail here.

[0296] <Twelfth Embodiment>

[0297] Please refer to Figure 22 This is a perspective view illustrating one side of an electronic device according to the twelfth embodiment of the present invention.

[0298] In this embodiment, the electronic device 400 is a smartphone. The electronic device 400 includes, according to the ninth embodiment, image capturing devices 100g, 100h, 100i, 100j, 100k, 100m, 100n, and 100p, a flash module 401, a focus assist module, an image signal processor, a display module, and an image software processor (not shown). Image capturing devices 100g, 100h, 100i, 100j, 100k, 100m, 100n, and 100p are all located on the same side of the electronic device 400, while the display module is located on the other side of the electronic device 400. Furthermore, the imaging devices 100g, 100h, 100i, 100j, 100k, 100m, 100n, and 100p can all include the optical image acquisition system of the present invention and can all have a structural configuration similar to that of the imaging device 100, which will not be described in detail here.

[0299] Image capturing device 100 is a wide-angle image capturing device, image capturing device 100g is a telephoto image capturing device, image capturing device 100h is a telephoto image capturing device, image capturing device 100i is a wide-angle image capturing device, image capturing device 100j is an ultra-wide-angle image capturing device, image capturing device 100k is an ultra-wide-angle image capturing device, image capturing device 100m is a telephoto image capturing device, image capturing device 100n is a telephoto image capturing device, and image capturing device 100p is a time-of-flight ranging image capturing device. In this embodiment, image capturing devices 100, 100g, 100h, 100i, 100j, 100k, 100m, and 100n have different viewing angles, allowing the electronic device 400 to provide different magnifications to achieve an optical zoom shooting effect. Furthermore, the image capturing device 100g and the image capturing device 100h can be telescopic image capturing devices configured with optical path deflection elements. The optical path deflection element configuration of the image capturing device 100g and the image capturing device 100h can, for example, have a similar... Figures 24 to 26 The structure can be referred to the aforementioned corresponding structure. Figures 24 to 26 The description of the image acquisition device 100p will not be repeated here. Additionally, the image acquisition device 100p is capable of acquiring the depth signal of the image. The electronic device 400 described above is exemplified by including multiple image acquisition devices 100, 100g, 100h, 100i, 100j, 100k, 100m, 100n, and 100p, but the number and configuration of the image acquisition devices are not intended to limit the invention. When a user photographs a subject, the electronic device 400 uses image acquisition devices 100, 100g, 100h, 100i, 100j, 100k, 100m, 100n, or 100p to focus light and acquire an image, activates the flash module 401 for supplemental lighting, and performs subsequent processing in a manner similar to the aforementioned embodiments, which will not be repeated here.

[0300] The image capturing device of the present invention is not limited to application in smartphones. It can also be applied to mobile focusing systems as needed, and features excellent aberration correction and good image quality. For example, the image capturing device can be widely used in electronic devices such as 3D image acquisition, digital cameras, mobile devices, tablet computers, smart TVs, network monitoring equipment, dashcams, reversing cameras, multi-lens devices, recognition systems, motion-sensing game consoles, and wearable devices. The aforementioned electronic devices are merely illustrative examples of practical applications of the present invention and do not limit the scope of application of the image capturing device of the present invention.

[0301] Although the present invention has been disclosed above with reference to the preferred embodiments described above, it is not intended to limit the present invention. Those skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of patent protection of the present invention must be defined with reference to the appended claims.

Claims

1. An optical image acquisition system, characterized in that, It includes: six lenses, which are arranged in sequence from the object side to the image side along the light path as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, and each of the six lenses has an object-side surface facing the object side and an image-side surface facing the image side. Wherein, the first lens has negative refractive power, and the object-side surface of the first lens is concave near the optical axis; the second lens has positive refractive power, and the image-side surface of the second lens is concave near the optical axis; the third lens has positive refractive power; the fourth lens has negative refractive power; the fifth lens has positive refractive power; the sixth lens has negative refractive power, and the image-side surface of the sixth lens is concave near the optical axis, and the image-side surface of the sixth lens has at least one critical point off-axis; Wherein, the Abbe number of the sixth lens is V6, the focal length of the optical image acquisition system is f, the radius of curvature of the object-side surface of the fourth lens is R7, the radius of curvature of the image-side surface of the fourth lens is R8, the thickness of the second lens on the optical axis is CT2, the thickness of the third lens on the optical axis is CT3, the thickness of the fourth lens on the optical axis is CT4, the distance between the second and third lenses on the optical axis is T23, and the distance between the fourth and fifth lenses on the optical axis is T45, which satisfies the following conditions: 10.0 < V6 < 44.0； -1.6 < f / R7 + f / R8 < 0.10; 0 < CT4 / T45 < 1.6; and 2.0 < (CT2+CT3) / T23 < 5.

8.

2. The optical image acquisition system as described in claim 1, characterized in that, The sixth lens has an Abbe number of V6, the fourth lens has a thickness of CT4 on the optical axis, and the distance between the fourth lens and the fifth lens on the optical axis is T45, satisfying the following conditions: 14.0 < V6 < 40.0; and 0.35 < CT4 / T45 < 1.

6.

3. The optical image acquisition system as described in claim 1, characterized in that, The optical image acquisition system has a focal length of f, the object-side surface of the fourth lens has a radius of curvature of R7, and the image-side surface of the fourth lens has a radius of curvature of R8, satisfying the following conditions: -1.4 < f / R7+f / R8 < 0.

4. The optical image acquisition system as described in claim 1, characterized in that, The Abbe number of the first lens is V1, the Abbe number of the second lens is V2, the Abbe number of the third lens is V3, the Abbe number of the fourth lens is V4, the Abbe number of the fifth lens is V5, and the Abbe number of the sixth lens is V6, satisfying the following condition: 2.0 < (V1+V3+V5) / (V2+V4+V6) < 3.0; Wherein, the vertical distance between the critical point of the image-side surface of the sixth lens and the optical axis is Yc62, the maximum effective radius of the image-side surface of the sixth lens is Y62, and the at least one critical point of the image-side surface of the sixth lens at the off-axis satisfies the following condition: 0.10 < Yc62 / Y62 < 0.

90.

5. The optical image acquisition system as described in claim 1, characterized in that, The thickness of the first lens along the optical axis is CT1, the thickness of the second lens along the optical axis is CT2, the distance between the fourth and fifth lenses along the optical axis is T45, and the distance between the fifth and sixth lenses along the optical axis is T56, satisfying the following conditions: 0.74 ≤ CT1 / CT2 < 2.5; and 4.0 < T45 / T56 < 18.

6. The optical image acquisition system as described in claim 1, characterized in that, The thickness of the first lens along the optical axis is CT1, and the distance between the first lens and the second lens along the optical axis is T12, satisfying the following conditions: 0.35 < CT1 / T12 < 1.

5.

7. The optical image acquisition system as described in claim 1, characterized in that, The thickness of the second lens on the optical axis is CT2, the distance between the fifth and sixth lenses on the optical axis is T56, the radius of curvature of the image-side surface of the second lens is R4, and the radius of curvature of the object-side surface of the third lens is R5, satisfying the following conditions: 3.3 < CT2 / T56 < 19; and 0.42 ≤ R4 / R5 < 1.

7.

8. The optical image acquisition system as described in claim 1, characterized in that, The distance between the third lens and the fourth lens on the optical axis is T34, the distance between the fifth lens and the sixth lens on the optical axis is T56, the focal length of the optical image acquisition system is f, and the radius of curvature of the image-side surface of the first lens is R2, which satisfies the following conditions: 1.1 < T34 / T56 < 10; and -0.14 < f / R2 < 0.

80.

9. The optical image acquisition system as described in claim 1, characterized in that, The radius of curvature of the object-side surface of the first lens is R1, and the radius of curvature of the image-side surface of the first lens is R2, which satisfy the following conditions: -5.3 < R1 / R2 < 0.

90.

10. The optical image acquisition system as described in claim 1, characterized in that, The radius of curvature of the object-side surface of the first lens is R1, the radius of curvature of the object-side surface of the second lens is R3, the radius of curvature of the image-side surface of the second lens is R4, and the focal length of the optical image acquisition system is f, which satisfies the following conditions: -9.0 < (R3+R4) / (R3-R4) < 0; and -1.5 < f / R1 < -0.

40.

11. The optical image acquisition system as described in claim 1, characterized in that, The optical image acquisition system has a focal length of f, the first lens has a focal length of f1, the second lens has a focal length of f2, the third lens has a focal length of f3, the fourth lens has a focal length of f4, the fifth lens has a focal length of f5, and the sixth lens has a focal length of f6, satisfying the following conditions: 0.25 < |f / f1| < 1.0; |f / f2| < 0.60; 0.45 < |f / f3| < 1.2; |f / f4| < 0.60; 0.35 < |f / f5| < 1.8; and |f / f6| < 1.

6.

12. The optical image acquisition system as described in claim 1, characterized in that, The focal length of the optical image acquisition system is f, and the combined focal length of the first lens and the second lens is f12, which satisfies the following conditions: f12 / f < 0.

13. The optical image acquisition system as described in claim 1, characterized in that, In the optical image acquisition system, at least one of the object-side and image-side surfaces of at least two lenses has at least one inflection point off-axis. In the optical image acquisition system, half of the maximum field of view is HFOV, and the aperture value of the optical image acquisition system is Fno, which satisfies the following conditions: 50.0 degrees < HFOV < 80.0 degrees; and 1.5 < Fno < 2.

4.

14. The optical image acquisition system as described in claim 1, characterized in that, The object-side surface of the sixth lens is convex near the optical axis; Wherein, the vertical distance between the critical point of the object-side surface of the sixth lens and the optical axis is Yc61, the maximum effective radius of the object-side surface of the sixth lens is Y61, and the object-side surface of the sixth lens has at least one critical point off-axis satisfying the following conditions: 0.10 < Yc61 / Y61 < 0.

90.

15. The optical image acquisition system as described in claim 1, characterized in that, The object-side surface of the second lens is convex near the optical axis, the object-side surface of the fourth lens is concave near the optical axis, and the image-side surface of the fifth lens is convex near the optical axis.

16. The optical image acquisition system as described in claim 1, characterized in that, The object-side surface of the third lens is convex near the optical axis, and the image-side surface of the third lens is also convex near the optical axis.

17. An image capturing device, characterized in that, Include: The optical image acquisition system as described in claim 1; and An electronic photosensitive element is disposed on an imaging surface of the optical image acquisition system.

18. An electronic device, characterized in that, Include: The imaging device as described in claim 17.

19. An optical image acquisition system, characterized in that, It includes: six lenses, which are arranged in sequence from the object side to the image side along the light path as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, and each of the six lenses has an object-side surface facing the object side and an image-side surface facing the image side. Wherein, the first lens has negative refractive power, and the object-side surface of the first lens is concave near the optical axis; the second lens has positive refractive power, and the image-side surface of the second lens is concave near the optical axis; the third lens has positive refractive power; the fourth lens has negative refractive power; the fifth lens has positive refractive power; the sixth lens has negative refractive power, and the image-side surface of the sixth lens is concave near the optical axis, and the image-side surface of the sixth lens has at least one critical point off-axis; Wherein, the Abbe number of the sixth lens is V6, the thickness of the first lens on the optical axis is CT1, the thickness of the second lens on the optical axis is CT2, the thickness of the third lens on the optical axis is CT3, the thickness of the fourth lens on the optical axis is CT4, the optical axis spacing between the first and second lenses is T12, the optical axis spacing between the second and third lenses is T23, and the optical axis spacing between the fourth and fifth lenses is T45, which satisfies the following conditions: 10.0 < V6 < 44.0； 0.65 < CT4 / T45 < 1.6; 0.35 < CT1 / T12 < 1.5; and 2.0 < (CT2+CT3) / T23 < 5.

8.

20. The optical image acquisition system as described in claim 19, characterized in that, The sixth lens has an Abbe number of V6, the optical image acquisition system has a focal length of f, the object-side surface of the fourth lens has a radius of curvature of R7, and the image-side surface of the fourth lens has a radius of curvature of R8, satisfying the following conditions: 14.0 < V6 < 40.0; and -2.0 < f / R7 + f / R8 < 0.

10.

21. The optical image acquisition system as described in claim 19, characterized in that, The thickness of the fourth lens on the optical axis is CT4, and the distance between the fourth lens and the fifth lens on the optical axis is T45, which satisfies the following conditions: 0.70 ≤ CT4 / T45 < 1.

4.

22. The optical image acquisition system as described in claim 19, characterized in that, The distance from the object-side surface of the first lens to an imaging plane on the optical axis is TL, the maximum imaging height of the optical image acquisition system is ImgH, the maximum effective radius of the object-side surface of the first lens is Y11, and the maximum effective radius of the image-side surface of the sixth lens is Y62, which satisfy the following conditions: 1.2 < TL / ImgH < 2.1; and 0.60 < Y62 / Y11 < 1.

6.

23. The optical image acquisition system as described in claim 19, characterized in that, The radius of curvature of the object-side surface of the first lens is R1, and the radius of curvature of the image-side surface of the first lens is R2, which satisfy the following conditions: -5.3 < R1 / R2 < 0.90; Wherein, the vertical distance between the critical point of the object-side surface of the first lens and the optical axis is Yc11, the maximum effective radius of the object-side surface of the first lens is Y11, and the object-side surface of the first lens has at least one critical point off-axis satisfying the following conditions: 0.10 < Yc11 / Y11 < 0.

90.

24. The optical image acquisition system as described in claim 19, characterized in that, The object-side surface of the second lens is convex near the optical axis, and the object-side surface of the fourth lens is concave near the optical axis.

Images