CN112327459B - Optical imaging system, imaging module and electronic device - Google Patents

Abstract

The present invention proposes an optical imaging system, an imaging module and an electronic device. The optical imaging system includes: a first lens with positive refractive power; a second lens with refractive power; a third lens with refractive power; a fourth lens with positive refractive power; a fifth lens with refractive power; a sixth lens with refractive power; a seventh lens with positive refractive power; and an eighth lens with negative refractive power; the optical imaging system satisfies the following relationship: 0.6＜TTL/(IMGH*2)≤0.7; wherein TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis, and IMGH is half of the image height corresponding to the maximum field of view of the optical imaging system. The above optical imaging system adopts eight lenses, reasonably configures the refractive power of each lens, and reduces the surface complexity of each lens, so that the total optical length is small, which helps to improve the resolution of the optical imaging system in the central field of view and the edge field of view.

Description

Optical imaging system, image capturing module and electronic device

Technical Field

The present disclosure relates to optical imaging technology, and more particularly, to an optical imaging system, an image capturing module, and an electronic device.

Background

At present, the portable imaging main lens solves the problem that the image quality is difficult to be improved due to the small bottom of the photosensitive chip by taking a high pixel or RYYB array photosensitive chip as a development direction. The high resolution is obtained by matching the photosensitive chip with the optical lens with high resolution, so that the night scene shooting quality is improved by one level, and RYYB is arranged, the photosensitive chip is arranged to improve the sensitivity from the chip angle, and meanwhile, the increased chip size is assisted, so that the good night scene shooting effect can be obtained.

In the process of realizing the application, the inventor finds that at least the following problems exist in the prior art that the prior eight-piece optical lens structure is difficult to meet the high resolution requirement of a high-pixel photosensitive chip, so that the resolution of the edge of an effective area is reduced faster, thereby influencing the imaging quality, and the prior eight-piece optical lens structure has larger volume and is difficult to meet the prior miniaturization requirement.

Disclosure of Invention

In view of the foregoing, it is necessary to provide an optical imaging system, an image capturing module and an electronic device to solve the above problems.

An embodiment of the present application provides an optical imaging system, including, in order from an object side to an image side:

A first lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

a second lens element with refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

a third lens element with refractive power;

A fourth lens element with positive refractive power having an object-side surface being convex at a paraxial region and an image-side surface being convex at a paraxial region;

a fifth lens element with refractive power;

A sixth lens element with refractive power;

A seventh lens element with positive refractive power;

An eighth lens element with negative refractive power having a concave object-side surface at a paraxial region, wherein the object-side surface and the image-side surface of the eighth lens element are aspheric, and at least one of the object-side surface and the image-side surface thereof is provided with at least one inflection point;

the optical imaging system satisfies the following relation:

0.6<TTL/(IMGH*2)≤0.7;

Wherein TTL is the distance between the object side surface of the first lens and the imaging surface of the optical imaging system on the optical axis, and IMGH is half of the image height corresponding to the maximum field angle of the optical imaging system.

The optical imaging system adopts eight lenses to reasonably configure the refractive power of each lens, reduces the surface type complexity of each lens, ensures that the total optical length is smaller, is beneficial to realizing the miniaturization of the optical imaging system, and is beneficial to improving the resolution of the optical imaging system in a central view field and an edge view field by reasonably configuring the TTL/IMGH value, so that the optical imaging system has high pixels, and is particularly beneficial to improving the image quality of the edge view field.

In some embodiments, the object-side surface of the third lens element is convex at a paraxial region and the image-side surface of the third lens element is concave at a paraxial region, the object-side surface of the fifth lens element is concave, the object-side surface and the image-side surface of the fifth lens element are aspheric, the object-side surface of the sixth lens element is convex at a paraxial region and the object-side surface and the image-side surface of the sixth lens element are aspheric, the object-side surface of the seventh lens element is convex at a paraxial region and the object-side surface and the image-side surface of the seventh lens element are aspheric, and at least one inflection point is disposed between the object-side surface and the image-side surface of the fifth lens element.

Therefore, by adjusting the curvature radius and the aspheric coefficients of the surfaces of the lenses, the overall size of the optical imaging system is effectively reduced, the occupied space is small, the aberration can be effectively corrected, and the imaging quality is improved.

In some embodiments, the optical imaging system satisfies the following relationship:

46.0mm<(|f2|+|f3|)/FNO<524.0mm;

Wherein f2 is an effective focal length of the second lens, f3 is an effective focal length of the third lens, and FNO is an f-number of the optical imaging system.

Therefore, the refractive power provided by the second lens and the third lens is changed, and meanwhile, the large-caliber light rays are compressed, so that the light beams of each view field are easy to adjust in the following lens, and the problem of poor optical performance sensitivity caused by large light ray deflection angle can be avoided.

In some embodiments, the optical imaging system satisfies the following relationship:

|SLOM52|/f<7.6°/mm;

Wherein SOLM is the angle between the tangent plane of the effective diameter edge of the image side surface of the fifth lens and the plane perpendicular to the optical axis, and f is the effective focal length of the optical imaging system.

The effective focal length of the optical imaging system meets the following relation formula that 4.6< f <5.7, the field angle of the optical imaging system can reach 91 degrees by matching with eight-piece lenses, good motion shooting effect can be obtained by sacrificing a smaller field angle during motion video shooting, an included angle between a tangent plane of the effective diameter edge of the fifth lens and a plane perpendicular to an optical axis is kept in a reasonable processing range, obvious reverse curvature is not seen, matching surface type change is facilitated, smooth transition of edge light is facilitated, stray light risk is small, and in addition, the edge thickness and the middle thickness of the fifth lens are uniform, so that the forming processing is facilitated.

In some embodiments, the optical imaging system satisfies the following relationship:

3.0mm<(R61/|R62|)*|f6|<148.0mm;

wherein R61 is a radius of curvature of an object side surface of the sixth lens element at the optical axis, R62 is a radius of curvature of an image side surface of the sixth lens element at the optical axis, and f6 is an effective focal length of the sixth lens element.

Therefore, the surface shape of the sixth lens can be changed through the change of the curvature radius of the object side surface and the image side surface of the sixth lens, for example, the surface shape of the sixth lens is W-shaped and C-shaped, wherein the W-shaped surface shape is easy to deflect light rays of each view field at a reasonable angle, the sensitivity of optical performance is reduced, the relative illumination is improved, the C-shaped surface shape can better improve the compactness between lenses, the overall thickness of an optical imaging system is reduced, the optical imaging system also has good optical characteristics, and the refractive power of the sixth lens is changed, and the comprehensive aberration of the optical imaging system can be balanced and the overall resolution is improved by matching with other lenses.

In some embodiments, the optical imaging system satisfies the following relationship:

(R71/|R72|)*|SLOM41|<9.2°;

Wherein R71 is a radius of curvature of the object side surface of the seventh lens element at the optical axis, R72 is a radius of curvature of the image side surface of the seventh lens element at the optical axis, and SLOM41 is an angle between a tangential plane of an effective diameter edge of the object side surface of the fourth lens element and a plane perpendicular to the optical axis.

In addition, the change of the included angle between the tangent plane of the effective diameter edge of the object side surface of the fourth lens and the plane perpendicular to the optical axis can cause the change of the surface of the object side surface, correspondingly enhance the matching effect of the fourth lens and the third lens, be beneficial to reducing the parasitic ghost image caused by light reflection and promote the compactness of the structure.

In some embodiments, the optical imaging system satisfies the following relationship:

0.52<(ET1+ET2+ET3+ET4)/(CT1+CT2+CT3+CT4)<0.68;

Wherein ET1 is the distance between the effective diameter edge of the object side surface of the first lens element and the effective diameter edge of the image side surface thereof in the optical axis direction, ET2 is the distance between the effective diameter edge of the object side surface of the second lens element and the effective diameter edge of the image side surface thereof in the optical axis direction, ET3 is the distance between the effective diameter edge of the object side surface of the third lens element and the effective diameter edge of the image side surface thereof in the optical axis direction, ET4 is the distance between the effective diameter edge of the object side surface of the fourth lens element and the effective diameter edge of the image side surface thereof in the optical axis direction, CT1 is the distance between the object side surface of the first lens element and the image side surface thereof in the optical axis direction, CT2 is the distance between the object side surface of the second lens element and the image side surface thereof in the optical axis direction, CT3 is the distance between the object side surface of the third lens element and the image side surface thereof in the optical axis direction, and CT4 is the distance between the object side surface of the fourth lens element and the image side surface thereof in the optical axis direction.

In addition, the first lens to the fourth lens are combined together to be similar to a positive lens, and the reduction of the thickness of the edge of the effective diameter and the compression of the caliber are matched, so that light rays with a large angle of view can be reasonably deflected, primary aberration is introduced uniformly, and the improvement of the assembly yield and the overall aberration balance is facilitated.

In some embodiments, the optical imaging system satisfies the following relationship:

0.19<ET78/CT78<0.45;

wherein ET78 is the distance between the effective diameter edge of the image side surface of the seventh lens element and the effective diameter edge of the object side surface of the eighth lens element in the optical axis direction, and CT78 is the distance between the intersection point of the image side surface of the seventh lens element and the optical axis and the intersection point of the object side surface of the eighth lens element and the optical axis in the optical axis direction.

Therefore, the reasonable maintenance of the clearance distance between the seventh lens and the eighth lens can avoid excessive bending of the angles of the seventh lens and the eighth lens, is beneficial to correcting the aberration generated by the optical imaging system under the large aperture, ensures that the refractive power arrangement in the direction perpendicular to the optical axis is uniform, is beneficial to improving the overall image quality, and is easy to mold and manufacture.

In some embodiments, the optical imaging system satisfies the following relationship:

0.45<(ET5+ET6+ET7)/CT57<0.7;

Wherein ET5 is the distance between the effective diameter edge of the object side surface of the fifth lens element and the effective diameter edge of the image side surface thereof in the optical axis direction, ET6 is the distance between the effective diameter edge of the object side surface of the sixth lens element and the effective diameter edge of the image side surface thereof in the optical axis direction, ET7 is the distance between the effective diameter edge of the object side surface of the seventh lens element and the effective diameter edge of the image side surface thereof in the optical axis direction, and CT57 is the distance between the intersection point of the object side surface of the fifth lens element and the optical axis and the intersection point of the image side surface of the seventh lens element and the optical axis in the optical axis direction.

Therefore, the thickness of the middle part and the thickness of the edge of the fifth lens element to the seventh lens element are reasonable, the surface variation is not excessive, the optical imaging system has good molding characteristics, primary aberration quantity is uniform and is easy to balance as a whole of aberration is introduced into the fifth lens element to the seventh lens element, support can be provided for improving the image quality of a large image plane through reasonable surface shape and refractive power variation, in addition, the high-grade aberration quantity is controllable, and the optical performance sensitivity of the optical imaging system can be effectively controlled.

The embodiment of the application also provides an image capturing module, which comprises:

optical imaging system

And the photosensitive element is arranged on the image side of the optical imaging system.

The imaging module comprises an optical imaging system, wherein eight lenses are adopted in the optical imaging system, the refractive power of each lens is reasonably configured, the surface type complexity of each lens is reduced, the total optical length is smaller, the miniaturization of the optical imaging system is facilitated, and the resolution of the optical imaging system in a central view field and an edge view field is facilitated to be improved by reasonably configuring the value of TTL/IMGH, so that the optical imaging system has high pixels, and the miniaturization of the optical imaging system is facilitated.

The embodiment of the invention provides an electronic device, which comprises a shell and the image capturing module of the embodiment, wherein the image capturing module is arranged on the shell.

The electronic device comprises an image capturing module, wherein an optical imaging system in the image capturing module reasonably configures the refractive power of each lens by adopting eight lenses, reduces the surface type complexity of each lens, enables the total optical length to be smaller, is favorable for realizing the miniaturization of the optical imaging system, and is favorable for improving the resolution of the optical imaging system in a central view field and an edge view field by reasonably configuring the value of TTL/IMGH, so that the optical imaging system has high pixels and is favorable for realizing the miniaturization of the optical imaging system.

Drawings

The foregoing and/or additional aspects and advantages of the invention may be apparent and may be readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

fig. 1 is a schematic structural view of an optical imaging system according to a first embodiment of the present invention.

Fig. 2 is a graph of spherical aberration, astigmatism and distortion of an optical imaging system in a first embodiment of the invention.

Fig. 3 is a schematic structural view of an optical imaging system according to a second embodiment of the present invention.

Fig. 4 is a graph of spherical aberration, astigmatism and distortion of an optical imaging system in a second embodiment of the invention.

Fig. 5 is a schematic structural view of an optical imaging system according to a third embodiment of the present invention.

Fig. 6 is a graph of spherical aberration, astigmatism and distortion of an optical imaging system in a third embodiment of the invention.

Fig. 7 is a schematic structural view of an optical imaging system according to a fourth embodiment of the present invention.

Fig. 8 is a graph of spherical aberration, astigmatism and distortion of an optical imaging system in a fourth embodiment of the invention.

Fig. 9 is a schematic structural view of an optical imaging system according to a fifth embodiment of the present invention.

Fig. 10 is a graph of spherical aberration, astigmatism and distortion of an optical imaging system in a fifth embodiment of the invention.

Fig. 11 is a schematic structural view of an optical imaging system according to a sixth embodiment of the present invention.

Fig. 12 is a graph of spherical aberration, astigmatism and distortion of an optical imaging system according to a sixth embodiment of the invention.

Fig. 13 is a schematic structural diagram of an electronic device according to an embodiment of the invention.

Description of the main reference signs

Electronic device 1000

Image capturing module 100

Optical imaging system 10

First lens L1

Second lens L2

Third lens L3

Fourth lens L4

Fifth lens L5

Sixth lens L6

Seventh lens L7

Eighth lens L8

Infrared filter L9

Stop STO

Object side surfaces S2, S4, S6, S8, S10, S12, S14, S16, S18

Image sides S3, S5, S7, S9, S11, S13, S15, S17, S19

Imaging surface S20

Photosensitive element 20

Housing 200

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, or communicable with each other, directly connected, indirectly connected via an intermediary, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is less level than the second feature.

The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.

Referring to fig. 1, an optical imaging system 10 according to an embodiment of the invention includes, in order from an object side to an image side, a first lens element L1 with positive refractive power, a second lens element L2 with positive refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with refractive power, a sixth lens element L6 with refractive power, a seventh lens element L7 with positive refractive power, and an eighth lens element L8 with negative refractive power.

The first lens element L1 has an object-side surface S2 and an image-side surface S3, the object-side surface S2 of the first lens element L1 is convex at a paraxial region, the image-side surface S3 of the first lens element L1 is concave at a paraxial region, the second lens element L2 has an object-side surface S4 and an image-side surface S5, the object-side surface S4 of the second lens element L2 is convex at a paraxial region, the image-side surface S5 of the second lens element L2 is concave at a paraxial region, the third lens element L3 has an object-side surface S6 and an image-side surface S7, the fourth lens element L4 has an object-side surface S8 and an image-side surface S9, the object-side surface S8 of the fourth lens element L4 is convex at a paraxial region, the image-side surface S9 is convex at a paraxial region, the fifth lens element L5 has an object-side surface S10 and an image-side surface S11, the sixth lens element L6 has an object-side surface S12 and an image-side surface S13, the seventh lens element L7 has an object-side surface S14 and an image-side surface S15, the eighth lens element L8 has an object-side surface S16 and an image-side surface S17, the eighth lens element L8 has an object-side surface S16 and an image-side surface S16 at least at a paraxial region, and at least one of the paraxial region of the object-side surface S16 and the image-side surface S16 is at least one of the paraxial region of the object-side surface S16 and at least.

The optical imaging system 10 satisfies the following relationship:

0.6<TTL/(IMGH*2)≤0.7;

Wherein TTL is a distance between the object side surface S2 of the first lens L1 and the imaging surface S20 of the optical imaging system 10 on the optical axis, and IMGH is half of an image height corresponding to a maximum field angle of the optical imaging system 10.

The optical imaging system 10 adopts eight lenses to reasonably configure the refractive power of each lens, reduces the surface type complexity of each lens, ensures that the total optical length is smaller, is beneficial to improving the miniaturization of the optical imaging system 10, and is beneficial to improving the resolving power of the optical imaging system 10 in a central view field and an edge view field by reasonably configuring the TTL/IMGH value, so that the optical imaging system 10 has high pixels, and is particularly beneficial to improving the image quality of the edge view field.

In some embodiments, the object-side surface S6 of the third lens element L3 is convex at a paraxial region and the image-side surface S7 is concave at a paraxial region, the object-side surface S10 of the fifth lens element L5 is concave, the object-side surface S10 and the image-side surface S11 thereof are aspheric, the object-side surface S12 of the sixth lens element L6 is convex at a paraxial region and the object-side surface S12 and the image-side surface S13 thereof are aspheric, the object-side surface S14 of the seventh lens element L7 is convex at a paraxial region, the object-side surface S14 and the image-side surface S15 of the seventh lens element L7 are aspheric, and at least one inflection point is disposed on at least one of the object-side surfaces and the image-side surfaces of the fifth lens element L5-seventh lens element L7.

The aspherical surface shape is determined by the following formula:

Wherein Z is the longitudinal distance between any point on the aspherical surface and the vertex of the surface, r is the distance between any point on the aspherical surface and the optical axis, c is the vertex curvature (the inverse of the curvature radius), k is a conic constant, and Ai is the correction coefficient of the i-th order of the aspherical surface.

Thus, by adjusting the curvature radius and the aspherical coefficient of each lens surface, the overall size of the optical imaging system 10 is effectively reduced, the occupied space is small, the aberration can be effectively corrected, and the imaging quality is improved.

In some embodiments, the optical imaging system 10 further includes a stop STO. The stop STO is used to reduce stray light and improve image quality. Preferably, the stop STO is disposed on the object side surface S2 of the first lens L1.

In some embodiments, the optical imaging system 10 further includes an infrared filter L9, the infrared filter L9 having an object side surface S18 and an image side surface S19. The infrared filter L9 is disposed at the image side of the eighth lens L8, and the infrared filter L9 is used for filtering the imaged light, and is specifically used for isolating infrared light, preventing the infrared light from being received by the photosensitive element, thereby preventing the infrared light from affecting the color and definition of the normal image, and further improving the imaging quality of the imaging lens 10. Preferably, the infrared filter L9 is an infrared cut filter.

In some embodiments, the optical imaging system 10 satisfies the following relationship:

46.0mm<(|f2|+|f3|)/FNO<524.0mm;

Where f2 is the effective focal length of the second lens L2, f3 is the effective focal length of the third lens L3, and FNO is the f-number of the optical imaging system 10.

Therefore, the refractive power provided by the second lens element L2 and the third lens element L3 is changed, and the large-caliber light rays are compressed, so that the light beams of each view field are easy to adjust in the following lens elements, and the problem of poor optical performance sensitivity caused by large light ray deviation angle can be avoided.

The F-number of the application satisfies the following relation that F-number is less than or equal to 1.3 and less than or equal to 1.6, when the F-number is within the range, the night view shooting capability of the miniature camera device can be better improved, the miniature camera device has good production feasibility, and the size of Ai Liban can be compressed by the reduction of the F-number, so that the miniature camera device has higher resolution limit. However, when FNO >1.6, the problem of dark corners around the imaging surface is not solved under the condition of insufficient light, the effect of enhancing the shooting capability is poor, and when FNO <1.3, the optical entrance pupil is larger, dust is easy to be stained, the design difficulty is higher, and the mass production is not facilitated.

In some embodiments, the optical imaging system 10 satisfies the following relationship:

|SLOM52|/f<7.6°/mm;

Wherein SOLM is the angle between the tangent plane of the effective diameter edge of the image side surface S11 of the fifth lens L5 and the plane perpendicular to the optical axis, and f is the effective focal length of the optical imaging system 10.

The effective focal length of the optical imaging system 10 satisfies the following relation that 4.6< f <5.7, the field angle of the optical imaging system 10 can reach 91 degrees by matching with an eight-piece lens, the good motion shooting effect can be obtained by sacrificing a smaller field angle during the motion video shooting, the included angle between the tangent plane of the effective diameter edge of the fifth lens and the plane perpendicular to the optical axis is kept in a reasonable processing range, no obvious reverse curvature is seen, the matching surface type is changed, the smooth transition of the edge light is facilitated, the parasitic light risk is small, and in addition, the edge thickness and the middle thickness of the fifth lens are uniform, so that the molding processing is facilitated.

In some embodiments, the optical imaging system 10 satisfies the following relationship:

3.0mm<(R61/|R62|)*|f6|<148.0mm;

Where R61 is a radius of curvature of the object-side surface S12 of the sixth lens L6 at the optical axis, R62 is a radius of curvature of the image-side surface S13 of the sixth lens L6 at the optical axis, and f6 is an effective focal length of the sixth lens L6.

In this way, the change of the radii of curvature of the object-side surface S12 and the image-side surface S13 of the sixth lens element L6 can change the surface shape of the sixth lens element L6, for example, the surface shape of the sixth lens element L6 is W-shaped and C-shaped, wherein the W-shaped surface shape easily deflects the light rays of each field of view at a reasonable angle, which is conducive to reducing the sensitivity of optical performance and improving the relative illuminance, the C-shaped surface shape can better improve the compactness between lenses, reduce the overall thickness of the optical imaging system 10, and also has good optical characteristics, and the refractive power of the sixth lens element L6 is changed to balance the overall aberration of the optical imaging system 10 and improve the overall resolution in cooperation with other lenses.

In some embodiments, the optical imaging system 10 satisfies the following relationship:

(R71/|R72|)*|SLOM41|<9.2°;

Wherein R71 is a radius of curvature of the object-side surface S14 of the seventh lens element L7 at the optical axis, R72 is a radius of curvature of the image-side surface S15 of the seventh lens element L7 at the optical axis, and SLOM41 is an angle between a tangent plane of an effective-diameter edge of the object-side surface S8 of the fourth lens element L4 and a plane perpendicular to the optical axis.

In addition, the change of the included angle between the tangent plane of the effective diameter edge of the object side S8 of the fourth lens L4 and the plane perpendicular to the optical axis can cause the surface type change of the object side, correspondingly enhance the matching effect of the fourth lens L4 and the third lens L3, and facilitate reducing the stray light ghost image caused by light reflection and improving the compactness of the structure.

In some embodiments, the optical imaging system satisfies the following relationship:

0.52<(ET1+ET2+ET3+ET4)/(CT1+CT2+CT3+CT4)<0.68;

Wherein ET1 is the distance between the effective diameter edge of the object side surface of the first lens element L1 and the effective diameter edge of the image side surface thereof in the optical axis direction, ET2 is the distance between the effective diameter edge of the object side surface S4 of the second lens element L2 and the effective diameter edge of the image side surface thereof in the optical axis direction, ET3 is the distance between the effective diameter edge of the object side surface S6 of the third lens element L3 and the effective diameter edge of the image side surface S7 thereof in the optical axis direction, ET4 is the distance between the effective diameter edge of the object side surface S8 of the fourth lens element L4 and the effective diameter edge of the image side surface S9 thereof in the optical axis direction, CT1 is the distance between the object side surface S2 of the first lens element L1 and the image side surface S3 thereof in the optical axis direction, CT2 is the distance between the object side surface S4 of the second lens element L2 and the image side surface S5 thereof, CT3 is the distance between the object side surface S6 of the third lens element L3 and the image side surface S7 thereof in the optical axis direction, and CT4 is the distance between the object side surface S8 of the object side surface S4 of the fourth lens element L4 and the image side surface S9 thereof in the optical axis direction.

In addition, the first lens L1 to the fourth lens L4 are combined together to be similar to a positive lens, and the reduction of the thickness of the edge of an effective diameter and the compression of the caliber are matched, so that light rays with a large field angle can be reasonably deflected, primary aberration is uniformly introduced, and the improvement of the assembly yield and the overall aberration balance is facilitated.

In some embodiments, the optical imaging system 10 satisfies the following relationship:

0.19<ET78/CT78<0.45;

the distance from the effective diameter edge of the image side surface S14 of the seventh lens element L7 to the effective diameter edge of the object side surface S15 of the eighth lens element L8 in the optical axis direction is ET78, and the distance from the intersection point of the image side surface S14 of the seventh lens element L7 and the optical axis to the intersection point of the object side surface S16 of the eighth lens element L8 and the optical axis in the optical axis direction is CT 78.

In this way, the reasonable maintenance of the gap distance between the seventh lens element L7 and the eighth lens element L8 can avoid excessive bending of the angles of the seventh lens element L7 and the eighth lens element L8, which is beneficial to correcting the aberration generated by the optical imaging system 10 under a large aperture, so that the refractive power arrangement in the direction perpendicular to the optical axis is uniform, which is beneficial to improving the overall image quality and is easy to be molded and manufactured.

In some embodiments, the optical imaging system 10 satisfies the following relationship:

0.45<(ET5+ET6+ET7)/CT57<0.7;

Wherein ET5 is the distance between the effective diameter edge of the object side surface S10 of the fifth lens element L5 and the effective diameter edge of the image side surface in the optical axis direction, ET6 is the distance between the effective diameter edge of the object side surface S12 of the sixth lens element L6 and the effective diameter edge of the image side surface in the optical axis direction, ET7 is the distance between the effective diameter edge of the object side surface S14 of the seventh lens element L7 and the effective diameter edge of the image side surface in the optical axis direction, and CT57 is the distance between the intersection point of the object side surface S10 of the fifth lens element L5 and the optical axis and the intersection point of the image side surface S15 of the seventh lens element L7 and the optical axis in the optical axis direction.

In this way, the thickness of the middle part and the thickness of the edge of the fifth lens L5 to the seventh lens L7 are reasonable, the surface variation is not excessive, so that the optical imaging system has good forming characteristics, the primary aberration quantity is uniform and the whole balance of aberration is easy to be carried out when the fifth lens L5 to the seventh lens L7 are introduced, the support can be provided for the image quality improvement of a large image surface through the reasonable surface type and the change of the refractive power, in addition, the high-grade aberration quantity is controllable, and the optical performance sensitivity of the optical imaging system can be effectively controlled.

First embodiment

Referring to fig. 1, the optical imaging system 10 of the first embodiment includes, in order from an object side to an image side, a stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, a sixth lens element L6 with positive refractive power, a seventh lens element L7 with positive refractive power, an eighth lens element L8 with negative refractive power, and an infrared filter L9.

The object-side surface S1 of the first lens element L1 is convex at a paraxial region, the image-side surface S2 is concave at a paraxial region, the object-side surface S3 of the second lens element L2 is convex at a paraxial region, the image-side surface S4 is concave at a paraxial region, the object-side surface S5 of the third lens element L3 is convex at a paraxial region, the image-side surface S6 is concave at a paraxial region, the object-side surface S7 of the fourth lens element L4 is convex at a paraxial region, the image-side surface S8 is convex at a paraxial region, the object-side surface S9 of the fifth lens element L5 is concave at a paraxial region, the image-side surface S10 is concave at a paraxial region, the object-side surface S11 of the sixth lens element L6 is convex at a paraxial region, the image-side surface S12 is concave at a paraxial region, the object-side surface S13 of the seventh lens element L7 is convex at a paraxial region, the image-side surface S14 is concave at a paraxial region, the object-side surface S15 of the eighth lens element L8 is concave at a paraxial region, and the image-side surface S16 is concave at a paraxial region.

The object-side surface S1 of the first lens element L1 is convex at a near circumference, the image-side surface S2 is concave at a near circumference, the object-side surface S3 of the second lens element L2 is convex at a near circumference, the image-side surface S4 is concave at a near circumference, the object-side surface S5 of the third lens element L3 is concave at a near circumference, the image-side surface S6 is concave at a near circumference, the object-side surface S7 of the fourth lens element L4 is concave at a near circumference, the image-side surface S8 is convex at a near circumference, the object-side surface S9 of the fifth lens element L5 is concave at a near circumference, the image-side surface S10 is concave at a near circumference, the object-side surface S11 of the sixth lens element L6 is concave at a near circumference, the object-side surface S13 of the seventh lens element L7 is concave at a near circumference, the image-side surface S14 is convex at a near circumference, the object-side surface S15 of the eighth lens element L8 is convex at a near circumference, and the image-side surface S16 is convex at a near circumference.

The reference wavelengths of the focal length, refractive index, and abbe number in the first embodiment are 587nm, and the optical imaging system 10 in the first embodiment satisfies the conditions of the following table.

TABLE 1

Note that f is a focal length of the optical imaging system 10, FNO is an f-number of the optical imaging system 10, FOV is a maximum field angle of the optical imaging system 10, and TTL is a distance between an object side surface of the first lens and an imaging surface of the optical imaging system on an optical axis.

TABLE 2

Fig. 2 shows a longitudinal spherical aberration curve, an astigmatic curve and a distortion curve of the optical imaging system 10 of the first embodiment, wherein the longitudinal spherical aberration curve represents a convergent focus deviation of light rays of different wavelengths after passing through each lens of the optical imaging system 10, the astigmatic curve represents a meridional image plane curvature and a sagittal image plane curvature, and the distortion curve represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 2, the optical imaging system 10 according to the first embodiment can achieve good imaging quality.

Second embodiment

Referring to fig. 3, the optical imaging system 20 of the second embodiment includes, in order from an object side to an image side, a stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, a sixth lens element L6 with positive refractive power, a seventh lens element L7 with positive refractive power, an eighth lens element L8 with negative refractive power, and an infrared filter L9.

The object-side surface S1 of the first lens element L1 is convex at a paraxial region, the image-side surface S2 is concave at a paraxial region, the object-side surface S3 of the second lens element L2 is convex at a paraxial region, the image-side surface S4 is concave at a paraxial region, the object-side surface S5 of the third lens element L3 is convex at a paraxial region, the image-side surface S6 is concave at a paraxial region, the object-side surface S7 of the fourth lens element L4 is convex at a paraxial region, the image-side surface S8 is convex at a paraxial region, the object-side surface S9 of the fifth lens element L5 is concave at a paraxial region, the image-side surface S10 is concave at a paraxial region, the object-side surface S11 of the sixth lens element L6 is convex at a paraxial region, the image-side surface S12 is convex at a paraxial region, the object-side surface S13 of the seventh lens element L7 is convex at a paraxial region, the image-side surface S14 is concave at a paraxial region, the object-side surface S15 of the eighth lens element L8 is concave at a paraxial region, and the image-side surface S16 is concave at a paraxial region.

The object-side surface S1 of the first lens element L1 is convex at a near circumference, the image-side surface S2 is convex at a near circumference, the object-side surface S3 of the second lens element L2 is convex at a near circumference, the image-side surface S4 is concave at a near circumference, the object-side surface S5 of the third lens element L3 is concave at a near circumference, the image-side surface S6 is concave at a near circumference, the object-side surface S7 of the fourth lens element L4 is concave at a near circumference, the image-side surface S8 is convex at a near circumference, the object-side surface S9 of the fifth lens element L5 is concave at a near circumference, the image-side surface S10 is convex at a near circumference, the object-side surface S11 of the sixth lens element L6 is concave at a near circumference, the object-side surface S13 of the seventh lens element L7 is concave at a near circumference, the image-side surface S14 is convex at a near circumference, the object-side surface S15 of the eighth lens element L8 is concave at a near circumference, and the image-side surface S16 is convex at a near circumference.

The reference wavelengths of the focal length, refractive index, and abbe number in the second embodiment are 587nm, and the optical imaging system 10 in the second embodiment satisfies the conditions of the following table.

TABLE 3 Table 3

Note that f is a focal length of the optical imaging system 10, FNO is an f-number of the optical imaging system 10, FOV is a maximum field angle of the optical imaging system 10, and TTL is a distance between an object side surface of the first lens and an imaging surface of the optical imaging system on an optical axis.

TABLE 4 Table 4

Fig. 4 shows a longitudinal spherical aberration curve, an astigmatic curve and a distortion curve of the optical imaging system 10 according to the second embodiment, wherein the longitudinal spherical aberration curve represents a convergent focus deviation of light rays of different wavelengths after passing through each lens of the optical imaging system 10, the astigmatic curve represents a meridional image plane curvature and a sagittal image plane curvature, and the distortion curve represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 4, the optical imaging system 10 according to the second embodiment can achieve good imaging quality.

Third embodiment

Referring to fig. 5, the optical imaging system 30 of the third embodiment includes, in order from an object side to an image side, a stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with positive refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, a sixth lens element L6 with positive refractive power, a seventh lens element L7 with positive refractive power, an eighth lens element L8 with negative refractive power, and an infrared filter L9.

The object-side surface S1 of the first lens element L1 is convex at a paraxial region, the image-side surface S2 is concave at a paraxial region, the object-side surface S3 of the second lens element L2 is convex at a paraxial region, the image-side surface S4 is concave at a paraxial region, the object-side surface S5 of the third lens element L3 is convex at a paraxial region, the image-side surface S6 is concave at a paraxial region, the object-side surface S7 of the fourth lens element L4 is convex at a paraxial region, the image-side surface S8 is convex at a paraxial region, the object-side surface S9 of the fifth lens element L5 is concave at a paraxial region, the image-side surface S10 is concave at a paraxial region, the object-side surface S11 of the sixth lens element L6 is convex at a paraxial region, the image-side surface S12 is concave at a paraxial region, the object-side surface S13 of the seventh lens element L7 is convex at a paraxial region, the image-side surface S14 is concave at a paraxial region, the object-side surface S15 of the eighth lens element L8 is concave at a paraxial region, and the image-side surface S16 is concave at a paraxial region.

The object-side surface S1 of the first lens element L1 is convex at a near circumference, the image-side surface S2 is concave at a near circumference, the object-side surface S3 of the second lens element L2 is convex at a near circumference, the image-side surface S4 is convex at a near circumference, the object-side surface S5 of the third lens element L3 is concave at a near circumference, the image-side surface S6 is concave at a near circumference, the object-side surface S7 of the fourth lens element L4 is convex at a near circumference, the image-side surface S8 is convex at a near circumference, the object-side surface S9 of the fifth lens element L5 is concave at a near circumference, the image-side surface S10 is convex at a near circumference, the object-side surface S11 of the sixth lens element L6 is convex at a near circumference, the object-side surface S13 of the seventh lens element L7 is concave at a near circumference, the image-side surface S14 is convex at a near circumference, the object-side surface S15 of the eighth lens element L8 is convex at a near circumference, and the image-side surface S16 is convex at a near circumference.

The reference wavelengths of the focal length, refractive index, and abbe number in the third embodiment are 587nm, and the optical imaging system 10 in the third embodiment satisfies the conditions of the following table.

TABLE 5

Note that f is a focal length of the optical imaging system 10, FNO is an f-number of the optical imaging system 10, FOV is a maximum field angle of the optical imaging system 10, and TTL is a distance between an object side surface of the first lens and an imaging surface of the optical imaging system on an optical axis.

TABLE 6

Fig. 6 shows a longitudinal spherical aberration curve, an astigmatic curve, and a distortion curve of the optical imaging system 10 of the third embodiment, where the longitudinal spherical aberration curve indicates a convergent focus deviation of light rays of different wavelengths after passing through each lens of the optical imaging system 10, the astigmatic curve indicates a meridional image plane curvature and a sagittal image plane curvature, and the distortion curve indicates distortion magnitude values corresponding to different angles of view. As can be seen from fig. 6, the optical imaging system 10 according to the third embodiment can achieve good imaging quality.

Fourth embodiment

Referring to fig. 7, the optical imaging system 40 of the fourth embodiment includes, in order from an object side to an image side, a stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with positive refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, a sixth lens element L6 with positive refractive power, a seventh lens element L7 with positive refractive power, an eighth lens element L8 with negative refractive power, and an infrared filter L9.

The object-side surface S1 of the first lens element L1 is convex at a paraxial region, the image-side surface S2 is concave at a paraxial region, the object-side surface S3 of the second lens element L2 is convex at a paraxial region, the image-side surface S4 is concave at a paraxial region, the object-side surface S5 of the third lens element L3 is convex at a paraxial region, the image-side surface S6 is concave at a paraxial region, the object-side surface S7 of the fourth lens element L4 is convex at a paraxial region, the image-side surface S8 is convex at a paraxial region, the object-side surface S9 of the fifth lens element L5 is concave at a paraxial region, the image-side surface S10 is concave at a paraxial region, the object-side surface S11 of the sixth lens element L6 is convex at a paraxial region, the image-side surface S12 is concave at a paraxial region, the object-side surface S13 of the seventh lens element L7 is convex at a paraxial region, the image-side surface S14 is concave at a paraxial region, the object-side surface S15 of the eighth lens element L8 is concave at a paraxial region, and the image-side surface S16 is concave at a paraxial region.

The object-side surface S1 of the first lens element L1 is convex at a near circumference, the image-side surface S2 is concave at a near circumference, the object-side surface S3 of the second lens element L2 is convex at a near circumference, the image-side surface S4 is concave at a near circumference, the object-side surface S5 of the third lens element L3 is concave at a near circumference, the image-side surface S6 is concave at a near circumference, the object-side surface S7 of the fourth lens element L4 is convex at a near circumference, the image-side surface S8 is convex at a near circumference, the object-side surface S9 of the fifth lens element L5 is concave at a near circumference, the image-side surface S10 is convex at a near circumference, the object-side surface S11 of the sixth lens element L6 is concave at a near circumference, the object-side surface S13 of the seventh lens element L7 is concave at a near circumference, the image-side surface S14 is convex at a near circumference, the object-side surface S15 of the eighth lens element L8 is concave at a near circumference, and the image-side surface S16 is convex at a near circumference.

The reference wavelengths of the focal length, refractive index, and abbe number in the fourth embodiment are 587nm, and the optical imaging system 10 in the fourth embodiment satisfies the conditions of the following table.

TABLE 7

Note that f is a focal length of the optical imaging system 10, FNO is an f-number of the optical imaging system 10, FOV is a maximum field angle of the optical imaging system 10, and TTL is a distance between an object side surface of the first lens and an imaging surface of the optical imaging system on an optical axis.

TABLE 8

Fig. 8 shows a longitudinal spherical aberration curve, an astigmatic curve, and a distortion curve of the optical imaging system 10 of the fourth embodiment, wherein the longitudinal spherical aberration curve represents a convergent focus deviation of light rays of different wavelengths after passing through each lens of the optical imaging system 10, the astigmatic curve represents a meridional image plane curvature and a sagittal image plane curvature, and the distortion curve represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 8, the optical imaging system 10 according to the fourth embodiment can achieve good imaging quality.

Fifth embodiment

Referring to fig. 9 and 10, the optical imaging system 50 of the fifth embodiment includes, in order from an object side to an image side, a stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with negative refractive power, a seventh lens element L7 with positive refractive power, an eighth lens element L8 with negative refractive power, and an infrared filter L9.

The object-side surface S1 of the first lens element L1 is convex at a paraxial region, the image-side surface S2 is concave at a paraxial region, the object-side surface S3 of the second lens element L2 is convex at a paraxial region, the image-side surface S4 is concave at a paraxial region, the object-side surface S5 of the third lens element L3 is convex at a paraxial region, the image-side surface S6 is concave at a paraxial region, the object-side surface S7 of the fourth lens element L4 is convex at a paraxial region, the image-side surface S8 is convex at a paraxial region, the object-side surface S9 of the fifth lens element L5 is concave at a paraxial region, the image-side surface S10 is convex at a paraxial region, the object-side surface S11 of the sixth lens element L6 is convex at a paraxial region, the image-side surface S12 is concave at a paraxial region, the object-side surface S13 of the seventh lens element L7 is convex at a paraxial region, the image-side surface S14 is convex at a paraxial region, the object-side surface S15 of the eighth lens element L8 is concave at a paraxial region, and the image-side surface S16 is concave at a paraxial region.

The object-side surface S1 of the first lens element L1 is convex at a near circumference, the image-side surface S2 is concave at a near circumference, the object-side surface S3 of the second lens element L2 is convex at a near circumference, the image-side surface S4 is concave at a near circumference, the object-side surface S5 of the third lens element L3 is concave at a near circumference, the image-side surface S6 is concave at a near circumference, the object-side surface S7 of the fourth lens element L4 is convex at a near circumference, the image-side surface S8 is convex at a near circumference, the object-side surface S9 of the fifth lens element L5 is concave at a near circumference, the image-side surface S10 is convex at a near circumference, the object-side surface S11 of the sixth lens element L6 is concave at a near circumference, the object-side surface S13 of the seventh lens element L7 is concave at a near circumference, the image-side surface S14 is convex at a near circumference, the object-side surface S15 of the eighth lens element L8 is concave at a near circumference, and the image-side surface S16 is convex at a near circumference.

The reference wavelengths of the focal length, refractive index, and abbe number in the fifth embodiment are 587nm, and the optical imaging system 10 in the fifth embodiment satisfies the conditions of the following table.

TABLE 9

Note that f is a focal length of the optical imaging system 10, FNO is an f-number of the optical imaging system 10, FOV is a maximum field angle of the optical imaging system 10, and TTL is a distance between an object side surface of the first lens and an imaging surface of the optical imaging system on an optical axis.

Table 10

Fig. 10 shows a longitudinal spherical aberration curve, an astigmatic curve, and a distortion curve of the optical imaging system 10 of the fifth embodiment, wherein the longitudinal spherical aberration curve represents a convergent focus deviation of light rays of different wavelengths after passing through each lens of the optical imaging system 10, the astigmatic curve represents a meridional image plane curvature and a sagittal image plane curvature, and the distortion curve represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 10, the optical imaging system 10 according to the fifth embodiment can achieve good imaging quality.

Sixth embodiment

Referring to fig. 11, the optical imaging system 60 of the sixth embodiment includes, in order from an object side to an image side, a stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with negative refractive power, a seventh lens element L7 with positive refractive power, an eighth lens element L8 with negative refractive power, and an infrared filter L9.

The object-side surface S1 of the first lens element L1 is convex at a paraxial region, the image-side surface S2 is concave at a paraxial region, the object-side surface S3 of the second lens element L2 is convex at a paraxial region, the image-side surface S4 is concave at a paraxial region, the object-side surface S5 of the third lens element L3 is convex at a paraxial region, the image-side surface S6 is concave at a paraxial region, the object-side surface S7 of the fourth lens element L4 is convex at a paraxial region, the image-side surface S8 is convex at a paraxial region, the object-side surface S9 of the fifth lens element L5 is concave at a paraxial region, the image-side surface S10 is convex at a paraxial region, the object-side surface S11 of the sixth lens element L6 is convex at a paraxial region, the image-side surface S12 is concave at a paraxial region, the object-side surface S13 of the seventh lens element L7 is convex at a paraxial region, the image-side surface S14 is convex at a paraxial region, the object-side surface S15 of the eighth lens element L8 is concave at a paraxial region, and the image-side surface S16 is concave at a paraxial region.

The object-side surface S1 of the first lens element L1 is convex at a near circumference, the image-side surface S2 is convex at a near circumference, the object-side surface S3 of the second lens element L2 is convex at a near circumference, the image-side surface S4 is concave at a near circumference, the object-side surface S5 of the third lens element L3 is concave at a near circumference, the image-side surface S6 is convex at a near circumference, the object-side surface S7 of the fourth lens element L4 is concave at a near circumference, the image-side surface S8 is convex at a near circumference, the object-side surface S9 of the fifth lens element L5 is concave at a near circumference, the image-side surface S10 is convex at a near circumference, the object-side surface S11 of the sixth lens element L6 is concave at a near circumference, the object-side surface S13 of the seventh lens element L7 is concave at a near circumference, the image-side surface S14 is convex at a near circumference, the object-side surface S15 of the eighth lens element L8 is concave at a near circumference, and the image-side surface S16 is convex at a near circumference.

The reference wavelengths of the focal length, refractive index, and abbe number in the sixth embodiment are 587nm, and the optical imaging system 10 in the sixth embodiment satisfies the conditions of the following table.

TABLE 11

Note that f is a focal length of the optical imaging system 10, FNO is an f-number of the optical imaging system 10, FOV is a maximum field angle of the optical imaging system 10, and TTL is a distance between an object side surface of the first lens and an imaging surface of the optical imaging system on an optical axis.

Table 12

Fig. 12 shows a longitudinal spherical aberration curve, an astigmatic curve, and a distortion curve of the optical imaging system 10 of the sixth embodiment, wherein the longitudinal spherical aberration curve represents a convergent focus deviation of light rays of different wavelengths after passing through each lens of the optical imaging system 10, the astigmatic curve represents a meridional image plane curvature and a sagittal image plane curvature, and the distortion curve represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 12, the optical imaging system 10 according to the sixth embodiment can achieve good imaging quality.

Table 13 shows values of TTL/(IMGH*2),(|f2|+|f3|)/FNO,|SLOM52|/f,(R61/|R62|)*|f6|,(R71/|R72|)*|SLOM41|,(ET1+ET2+ET3+ET4)/(CT1+CT2+CT3+CT4),ET78/CT78 and (et5+et6+et7)/CT 57 in the optical imaging systems 10 of the first to sixth embodiments.

Table 15

Referring to fig. 13, an image capturing module 100 according to an embodiment of the present invention includes an optical imaging system 10 and a photosensitive element 80, wherein the photosensitive element 20 is disposed on an image side of the optical imaging system 10.

Specifically, the photosensitive element 20 may be a complementary metal oxide semiconductor (CMOS, complementary Metal Oxide Semiconductor) image sensor or a Charge-coupled Device (CCD).

The optical imaging system 10 in the image capturing module 100 according to the embodiment of the invention adopts eight lenses to reasonably configure the refractive power of each lens, reduce the surface complexity of each lens, make the total optical length smaller, and facilitate the miniaturization of the optical imaging system 10, and by reasonably configuring the value of TTL/IMGH, the resolving power of the optical imaging system 10 in the central view field and the edge view field is facilitated to be improved, so that the optical imaging system 10 has high pixels, and is particularly beneficial to the improvement of the image quality of the edge view field.

With continued reference to fig. 13, the electronic device 1000 according to the embodiment of the invention includes a housing 200 and an image capturing module 100, where the image capturing module 100 is mounted on the housing 200 for capturing an image.

The electronic device 1000 according to the embodiment of the present invention includes, but is not limited to, an electronic device supporting imaging for a smart phone, an automobile-mounted lens, a monitoring lens, a tablet computer, a notebook computer, an electronic book reader, a Portable Multimedia Player (PMP), a portable phone, a video phone, a digital still camera, an ambulatory medical device, a wearable device, and the like.

The optical imaging system 10 in the electronic device 1000 of the embodiment reasonably configures the refractive power of each lens by adopting eight lenses, reduces the surface complexity of each lens, makes the total optical length smaller, is beneficial to realizing miniaturization of the optical imaging system 10, and is beneficial to improving the resolving power of the optical imaging system 10 in the central view field and the edge view field by reasonably configuring the value of TTL/IMGH, so that the optical imaging system 10 has high pixels, and is particularly beneficial to improving the image quality of the edge view field.

It will be evident to those skilled in the art that the application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Finally, it should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present application without departing from the spirit and scope of the technical solution of the present application.

Claims (10)

1. An optical imaging system, comprising, in order from an object side to an image side:

A first lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

a second lens element with refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

A third lens element with refractive power having an object-side surface being convex at a paraxial region and an image-side surface being concave at a paraxial region;

A fourth lens element with positive refractive power having an object-side surface being convex at a paraxial region and an image-side surface being convex at a paraxial region;

The object side surface of the fifth lens is a concave surface, and both the object side surface and the image side surface of the fifth lens are aspheric;

A sixth lens element with refractive power having a convex object-side surface at a paraxial region, wherein the object-side surface and the image-side surface of the sixth lens element are aspheric;

A seventh lens element with positive refractive power having a convex object-side surface at a paraxial region, wherein the object-side and image-side surfaces of the seventh lens element are aspheric, and at least one inflection point is disposed on at least one of the object-side and image-side surfaces of the fifth lens element;

An eighth lens element with negative refractive power having a concave object-side surface at a paraxial region, wherein the object-side surface and the image-side surface of the eighth lens element are aspheric, and at least one of the object-side surface and the image-side surface thereof is provided with at least one inflection point;

the optical imaging system further comprises a diaphragm, and the diaphragm is arranged on the object side surface of the first lens;

the optical imaging system satisfies the following relation:

0.6<TTL/(IMGH*2)≤0.7;

Wherein TTL is the distance between the object side surface of the first lens and the imaging surface of the optical imaging system on the optical axis, and IMGH is half of the image height corresponding to the maximum field angle of the optical imaging system.

2. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following relationship:

46.0mm<(|f2|+|f3|)/FNO<524.0mm;

Wherein f2 is an effective focal length of the second lens, f3 is an effective focal length of the third lens, and FNO is an f-number of the optical imaging system.

3. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following relationship:

|SLOM52|/f<7.6°/mm;

Wherein SOLM is the angle between the tangent plane of the effective diameter edge of the image side surface of the fifth lens and the plane perpendicular to the optical axis, and f is the effective focal length of the optical imaging system.

4. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following relationship:

3.0mm<(R61/|R62|)*|f6|<148.0mm;

wherein R61 is a radius of curvature of an object side surface of the sixth lens element at the optical axis, R62 is a radius of curvature of an image side surface of the sixth lens element at the optical axis, and f6 is an effective focal length of the sixth lens element.

5. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following relationship:

(R71/|R72|)*|SLOM41|<9.2°;

Wherein R71 is a radius of curvature of the object side surface of the seventh lens element at the optical axis, R72 is a radius of curvature of the image side surface of the seventh lens element at the optical axis, and SLOM41 is an angle between a tangential plane of an effective diameter edge of the object side surface of the fourth lens element and a plane perpendicular to the optical axis.

6. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following relationship:

0.52<(ET1+ET2+ET3+ET4)/(CT1+CT2+CT3+CT4)<0.68;

Wherein ET1 is the distance between the effective diameter edge of the object side surface of the first lens element and the effective diameter edge of the image side surface thereof in the optical axis direction, ET2 is the distance between the effective diameter edge of the object side surface of the second lens element and the effective diameter edge of the image side surface thereof in the optical axis direction, ET3 is the distance between the effective diameter edge of the object side surface of the third lens element and the effective diameter edge of the image side surface thereof in the optical axis direction, ET4 is the distance between the effective diameter edge of the object side surface of the fourth lens element and the effective diameter edge of the image side surface thereof in the optical axis direction, CT1 is the distance between the object side surface of the first lens element and the image side surface thereof in the optical axis direction, CT2 is the distance between the object side surface of the second lens element and the image side surface thereof in the optical axis direction, CT3 is the distance between the object side surface of the third lens element and the image side surface thereof in the optical axis direction, and CT4 is the distance between the object side surface of the fourth lens element and the image side surface thereof in the optical axis direction.

7. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following relationship:

0.19<ET78/CT78<0.45;

wherein ET78 is the distance between the effective diameter edge of the image side surface of the seventh lens element and the effective diameter edge of the object side surface of the eighth lens element in the optical axis direction, and CT78 is the distance between the intersection point of the image side surface of the seventh lens element and the optical axis and the intersection point of the object side surface of the eighth lens element and the optical axis in the optical axis direction.

8. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following relationship:

0.45<(ET5+ET6+ET7)/CT57<0.7;

Wherein ET5 is the distance between the effective diameter edge of the object side surface of the fifth lens element and the effective diameter edge of the image side surface thereof in the optical axis direction, ET6 is the distance between the effective diameter edge of the object side surface of the sixth lens element and the effective diameter edge of the image side surface thereof in the optical axis direction, ET7 is the distance between the effective diameter edge of the object side surface of the seventh lens element and the effective diameter edge of the image side surface thereof in the optical axis direction, and CT57 is the distance between the intersection point of the object side surface of the fifth lens element and the optical axis and the intersection point of the image side surface of the seventh lens element and the optical axis in the optical axis direction.

9. An image capturing module, comprising:

The optical imaging system according to claim 1 to 8, and

And the photosensitive element is arranged on the image side of the optical imaging system.

10. An electronic device, comprising:

Housing body

The imaging module of claim 9, the imaging module mounted on the housing.