WO2022110044A1 - Optical imaging system, image capturing module, and electronic device - Google Patents

Abstract

An optical imaging system (10), an image capturing module (100), and an electronic device (1000). The optical imaging system (10) comprises: a first lens (L1) having positive refractive power; a second lens (L2) having refractive power; a third lens (L3) having refractive power; a fourth lens (L4) having positive refractive power; a fifth lens (L5) having refractive power; a sixth lens (L6) having refractive power; a seventh lens (L7) having positive refractive power; and an eighth lens (L8) having negative refractive power. The optical imaging system (10) satisfies the following relationship: 0.6<TTL/(IMGH*2)≤0.7, wherein TTL is a distance, on an optical axis, from an object side surface (S2) of the first lens (L1) to an imaging surface (S20) of the optical imaging system (10), and IMGH is a half of an image height corresponding to the maximum field of view angle of the optical imaging system (10). By using eight lens, rationally configuring the refractive power of each lens, and reducing the surface complexity of each lens, the optical imaging system (10) makes a total optical length small, thus facilitating improving the resolution of the optical imaging system (10) in a center field of view and an edge field of view.

Description

Optical imaging system, imaging module and electronic device technical field

The present application relates to optical imaging technology, and in particular, to an optical imaging system, an imaging module and an electronic device.

Background technique

At present, the main portable imaging lens adopts the high-pixel or RYYB arrangement of photosensitive chips as the development direction to solve the problem that the image quality is difficult to improve due to the small bottom of the photosensitive chip. The extremely high pixel is obtained by combining the photosensitive chip with the high-resolution optical lens to obtain extremely high resolution, which improves the image quality of night scene shooting to a level; the RYYB array photosensitive chip increases the sensitivity from the chip angle, and is supplemented by an enlarged chip. It can also get a good night scene shooting effect.

In the process of realizing this application, the inventor found that there are at least the following problems in the prior art: the existing eight-piece optical lens structure is difficult to meet the high resolution requirements of high-pixel photosensitive chips, so that the resolution at the edge of the effective area decreases rapidly, As a result, the imaging quality is affected, and the existing eight-piece optical lens structure has a large volume, which is difficult to meet the existing miniaturization requirements.

SUMMARY OF THE INVENTION

In view of the above content, it is necessary to propose an optical imaging system, an imaging module and an electronic device to solve the above problems.

The embodiment of the present application proposes an optical imaging system, which includes sequentially from the object side to the image side:

A first lens with positive refractive power, the object side of the first lens is convex at the near optical axis, and the image side is concave at the near optical axis;

A second lens with refractive power, the object side of the second lens is convex at the near optical axis, and the image side is concave at the near optical axis;

a third lens having refractive power;

The fourth lens with positive refractive power, the object side of the fourth lens is convex at the near optical axis, and the image side is convex at the near optical axis;

a fifth lens with refractive power;

a sixth lens with refractive power;

a seventh lens with positive refractive power;

The eighth lens with negative refractive power, the object side of the eighth lens is concave at the near optical axis, the object side and the image side of the eighth lens are aspherical, and the object side and the image side of the eighth lens are aspherical. At least one face is provided with at least one inflection point;

The optical imaging system satisfies the following relationship:

0.6＜TTL/(IMGH*2)≤0.7;

Wherein, TTL is the distance on the optical axis from the object side of the first lens to the imaging plane of the optical imaging system, and IMGH is half of the image height corresponding to the maximum angle 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 is conducive to realizing the miniaturization of the optical imaging system; by rationally configuring TTL/IMGH The value of , helps to improve the resolution of the optical imaging system in the center field of view and the edge field of view, so that it has high pixels, especially for the improvement of the image quality of the edge field of view.

In some embodiments, the object side of the third lens is convex at the near optical axis, and the image side is concave at the near optical axis; the object side of the fifth lens is concave, and the object side and the image side are concave. are aspherical; the object side of the sixth lens is convex at the near optical axis, and both the object side and the image side are aspherical; the object side of the seventh lens is convex at the near optical axis, so The object side and the image side of the seventh lens are both aspherical; at least one inflection point is set on at least one of the object side and the image side of the fifth lens to the seventh lens.

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

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

46.0mm＜(|f2|+|f3|)/FNO＜524.0mm;

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

In this way, the refractive power provided by the second lens and the third lens changes, and the large-diameter light is compressed at the same time, so that the light beam of each field of view can be easily adjusted in the subsequent lens, and the optical performance caused by the large deviation angle of the light can be avoided. problem of poor sensitivity.

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

|SLOM52|/f＜7.6°/mm;

Wherein, SOLM52 is the angle between the tangent plane of the effective diameter edge of the image side 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 satisfies the following relationship: 4.6 < f < 5.7. With eight lenses, the field of view of the optical imaging system can reach 91 degrees, which is helpful for shooting sports videos with a smaller field of view. Sacrifice to obtain a good sports shooting effect; the angle between the cut surface of the edge of the effective diameter of the fifth lens and the plane perpendicular to the optical axis is kept within a reasonable processing range, and no obvious inflection is seen. The edge light transitions smoothly, and the risk of stray light is small; in addition, the edge thickness and the middle thickness of the fifth lens are uniform, which is conducive to the molding process.

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

3.0mm＜(R61/|R62|)*|f6|＜148.0mm;

Wherein, R61 is the radius of curvature of the object side of the sixth lens at the optical axis, R62 is the radius of curvature of the image side of the sixth lens at the optical axis, and f6 is the effective focal length of the sixth lens.

In this way, the surface shape of the sixth lens can be changed by changing the radius of curvature of the object side surface and the image side surface of the sixth lens. For example, the surface shapes of the sixth lens are W-shaped and C-shaped. The light of each field of view is deflected at a reasonable angle, which helps to reduce the sensitivity of optical performance and improve the relative illuminance; the C-shaped surface can better improve the compactness between lenses and reduce the overall thickness of the optical imaging system , also has good optical characteristics; and through the change of the refractive power of the sixth lens, with other lenses, it can balance the comprehensive aberration of the optical imaging system and improve the overall resolution.

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

(R71/|R72|)*|SLOM41|＜9.2°;

Wherein, R71 is the radius of curvature of the object side of the seventh lens at the optical axis, R72 is the radius of curvature of the image side of the seventh lens at the optical axis, and SLOM41 is the effective radius of the object side of the fourth lens The angle between the tangent plane of the radial edge and the plane perpendicular to the optical axis.

In this way, the seventh lens has a W-shaped arrangement structure, and the aspheric surface introduces fewer high-order terms, which does not cause drastic changes in its surface shape, and has reasonable inclination and thickness, and has good processing characteristics; and the reasonable deviation of light, The angle of the final incident imaging surface is small, which is conducive to the matching of chips; in addition, the change of the angle between the tangent plane of the effective diameter edge of the object side of the fourth lens and the plane perpendicular to the optical axis can cause the surface shape of the object side The change, correspondingly enhances the cooperation effect of the fourth lens and the third lens, helps to reduce stray light ghost images caused by light reflection, and improves 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 of the first lens and the effective diameter edge of the image side in the optical axis direction, and ET2 is the effective diameter edge of the object side of the second lens and the effective diameter of the image side. The distance of the edge in the direction of the optical axis, ET3 is the distance between the effective diameter edge of the object side of the third lens and the effective diameter edge of the image side in the optical axis direction, ET4 is the effective diameter edge of the object side of the fourth lens The distance from the effective diameter edge of its image side in the direction of the optical axis, CT1 is the distance from the object side of the first lens to its image side on the optical axis, and CT2 is the object side of the second lens to its image side. The distance on the optical axis, CT3 is the distance on the optical axis from the object side of the third lens to its image side, and CT4 is the distance on the optical axis from the object side of the fourth lens to its image side.

In this way, the rationality of the thickness and the gap is related to the difficulty of forming and manufacturing the lens. When the above formula is satisfied, the thickness of the first lens to the fourth lens can be made appropriate, and the distance between the lenses is reasonable, which can effectively improve the lens structure. The compactness is conducive to the molding and assembly of the lens; in addition, the first lens to the fourth lens are combined together like a positive lens, and with the reduction of the thickness of the effective diameter edge and the compression of the aperture, it can give a reasonable polarization to the light with a large field of view. It also introduces uniform primary aberrations, which helps to improve assembly yield and overall aberration balance.

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

0.19＜ET78/CT78＜0.45;

Wherein, ET78 is the distance from the effective diameter edge of the image side of the seventh lens to the effective diameter edge of the object side of the eighth lens in the direction of the optical axis, and CT78 is the distance between the image side and the optical axis of the seventh lens. The distance from the intersection to the intersection of the object side surface of the eighth lens and the optical axis in the direction of the optical axis.

In this way, the reasonable maintenance of the gap distance between the seventh lens and the eighth lens can avoid excessive bending of the angle between the seventh lens and the eighth lens, which is beneficial to correct the aberration generated by the optical imaging system under the large aperture, so that the angle perpendicular to the optical axis can be corrected. The inflection force in the direction is evenly distributed, which helps to improve the overall image quality and is easy to form 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 of the fifth lens and the effective diameter edge of the image side in the optical axis direction, and ET6 is the effective diameter edge of the object side of the sixth lens and the effective diameter of the image side. The distance of the edge in the direction of the optical axis, ET7 is the distance between the effective diameter edge of the object side of the seventh lens and the effective diameter edge of the image side in the direction of the optical axis, and CT57 is the distance between the object side of the fifth lens and the optical axis. The distance from the intersection to the intersection of the image side surface of the seventh lens and the optical axis in the direction of the optical axis.

In this way, the thickness of the middle and the edge of the fifth lens to the seventh lens are reasonable, and the surface shape change will not be too large, so that the optical imaging system has good molding characteristics; and the fifth lens to the seventh lens introduce a uniform amount of primary aberration, It is easy to balance the overall aberration, and through reasonable changes in surface shape and refractive force, it can provide support for the image quality improvement of the large image plane; in addition, the advanced aberration amount can be controlled, and the optical performance sensitivity of the optical imaging system can be effectively improved. control.

The embodiment of the present application also proposes an imaging module, including:

optical imaging systems; and

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

The imaging module according to the embodiment of the present application includes an optical imaging system. By using eight lenses, the optical imaging system reasonably configures the refractive power of each lens, reduces the surface complexity of each lens, and makes the total optical length smaller, which is beneficial to Realize the miniaturization of the optical imaging system; by reasonably configuring the value of TTL/IMGH, it is helpful to improve the resolution of the optical imaging system in the central field of view and the edge field of view, making it have high pixels, which is conducive to the miniaturization of the optical imaging system .

An embodiment of the present application provides an electronic device, which includes: a casing and the imaging module of the above-mentioned embodiment, where the imaging module is mounted on the casing.

The electronic device of the embodiment of the present application includes an imaging module, and the optical imaging system in the imaging module adopts eight lenses to reasonably configure the refractive power of each lens, and reduce the surface complexity of each lens, so that the total optical length is reduced. It is small, which is conducive to the miniaturization of the optical imaging system; by rationally configuring the value of TTL/IMGH, it helps to improve the resolution of the optical imaging system in the center field of view and the edge field of view, so that it has high pixels, which is conducive to the realization of optical imaging. Miniaturization of imaging systems.

Description of drawings

The above and/or additional aspects and advantages of the present application may become apparent and readily understood from the following description of embodiments in conjunction with the accompanying drawings, wherein:

FIG. 1 is a schematic structural diagram of an optical imaging system according to a first embodiment of the present application.

FIG. 2 is a graph of spherical aberration, astigmatism and distortion of the optical imaging system in the first embodiment of the present application.

FIG. 3 is a schematic structural diagram of an optical imaging system according to a second embodiment of the present application.

FIG. 4 is a graph of spherical aberration, astigmatism and distortion of the optical imaging system in the second embodiment of the present application.

FIG. 5 is a schematic structural diagram of an optical imaging system according to a third embodiment of the present application.

FIG. 6 is a graph of spherical aberration, astigmatism and distortion of the optical imaging system in the third embodiment of the present application.

FIG. 7 is a schematic structural diagram of an optical imaging system according to a fourth embodiment of the present application.

FIG. 8 is a graph showing spherical aberration, astigmatism and distortion of the optical imaging system in the fourth embodiment of the present application.

FIG. 9 is a schematic structural diagram of an optical imaging system according to a fifth embodiment of the present application.

FIG. 10 is a graph of spherical aberration, astigmatism and distortion of the optical imaging system in the fifth embodiment of the present application.

FIG. 11 is a schematic structural diagram of an optical imaging system according to a sixth embodiment of the present application.

FIG. 12 is a graph of spherical aberration, astigmatism and distortion of the optical imaging system in the sixth embodiment of the present application.

FIG. 13 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Description of main component symbols

Electronic device 1000

Image acquisition module 100

Optical imaging system 10

The first lens L1

Second lens L2

The third lens L3

Fourth lens L4

Fifth lens L5

The sixth lens L6

The seventh lens L7

Eighth lens L8

Infrared filter L9

Aperture STO

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

Like the side S3, S5, S7, S9, S11, S13, S15, S17, S19

Imaging surface S20

Photosensitive element 20

Shell 200

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outer", clockwise, "counterclockwise" The relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore Can not be construed as a limitation to the application. In addition, the terms "first" and "second" are only used for description purposes, and cannot be interpreted as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus , the features defined with "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more , unless otherwise specifically defined.

In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; it can be mechanical connection, electrical connection or can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction of two elements relation. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

In this application, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may include the first and second features in direct contact, or may include the first and second features Not directly but through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "beneath" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level less than the second feature.

The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are only examples and are not intended to limit the application. Furthermore, this application may repeat reference numerals and/or reference letters in different instances for the purpose of simplicity and clarity, and does not in itself indicate a relationship between the various embodiments and/or arrangements discussed. In addition, this application 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 , the optical imaging system 10 of the embodiment of the present application sequentially includes, from the object side to the image side, a first lens L1 with positive refractive power, a second lens L2 with refractive power, a third lens L3 with refractive power, A fourth lens L4 having a positive refractive power, a fifth lens L5 having a refractive power, a sixth lens L6 having a refractive power, a seventh lens L7 having a positive refractive power, and an eighth lens L8 having a negative refractive power.

The first lens L1 has an object side S2 and an image side S3, the object side S2 of the first lens L1 is convex at the near optical axis, and the image side S3 of the first lens L1 is concave at the near optical axis; the second lens L2 has The object side S4 and the image side S5, the object side S4 of the second lens L2 is convex at the near optical axis, and the image side S5 of the second lens L2 is concave at the near optical axis; the third lens L3 has the object side S6 and the image side S7, the fourth lens L4 has the object side S8 and the image side S9, the object side S8 of the fourth lens L4 is convex at the near optical axis, and the image side S9 is convex at the near optical axis; the fifth lens L5 has the object side S10 And the image side S11; the sixth lens L6 has the object side S12 and the image side S13; the seventh lens L7 has the object side S14 and the image side S15; the eighth lens L8 has the object side S16 and the image side S17, the object of the eighth lens L8 The side S16 is concave at the near optical axis, the object side S16 and the image side S17 of the eighth lens L8 are both aspherical, and at least one of the object side S16 and the image side S17 is provided with at least one inflection point.

The optical imaging system 10 satisfies the following relationship:

0.6＜TTL/(IMGH*2)≤0.7;

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

The above-mentioned optical imaging system 10 adopts eight lenses to reasonably configure 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 miniaturization of the optical imaging system 10; The value of TTL/IMGH helps to improve the resolution of the optical imaging system 10 in the center field of view and the edge field of view, so that it has high pixels, and is especially helpful for improving the image quality of the edge field of view.

In some embodiments, the object side S6 of the third lens L3 is convex at the near optical axis, and the image side S7 is concave at the near optical axis; the object side S10 of the fifth lens L5 is concave, and the object side S10 and The image side S11 is aspherical; the object side S12 of the sixth lens L6 is a convex surface at the near optical axis, and its object side S12 and the image side S13 are both aspherical; the object side S14 of the seventh lens L7 is at the near optical axis At least one of the object side surface and the image side surface of the fifth lens L5 to the seventh lens L7 is provided with at least one inflection point.

The shape of the aspheric surface is determined by the following formula:

where Z is the longitudinal distance between any point on the aspheric surface and the vertex of the surface, r is the distance from any point on the aspheric surface to the optical axis, c is the vertex curvature (the inverse of the radius of curvature), k is the conic constant, and Ai is the i-th aspheric surface order correction factor.

In this way, by adjusting the curvature radius and aspheric coefficient of each lens surface, the overall size of the optical imaging system 10 can be effectively reduced, the space occupied is small, and the aberration can be effectively corrected to improve the imaging quality.

In some embodiments, the optical imaging system 10 further includes a stop STO. The stop STO may be disposed before the first lens L1, after the sixth lens L6, between any two lenses, or on the surface of any one lens. Aperture STO is used to reduce stray light and help improve image quality. Preferably, the diaphragm STO is arranged 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, and the infrared filter L9 has an object side S18 and an image side S19. The infrared filter L9 is arranged on the image side of the eighth lens L8, and the infrared filter L9 is used to filter the imaged light, specifically for isolating the infrared light, preventing the infrared light from being received by the photosensitive element, thereby preventing the infrared light from affecting the normal image. Color and sharpness are affected, thereby improving the imaging quality of the imaging lens 10 . Preferably, the infrared filter L9 is an infrared cut-off filter.

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

46.0mm＜(|f2|+|f3|)/FNO＜524.0mm;

Wherein, 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 aperture number of the optical imaging system 10 .

In this way, the refractive power provided by the second lens L2 and the third lens L3 changes, and the large-diameter light is compressed at the same time, so that the light beams of each field of view can be easily adjusted in the subsequent lenses, and the large light deviation angle can be avoided. The problem of poor optical performance sensitivity.

Among them, the aperture number determines the total energy of the light incident on the imaging surface, and the aperture number of the present application satisfies the following relationship: 1.3≤FNO≤1.6, within this range, the night scene shooting capability of the miniature imaging device can be better improved, At the same time, it has good production feasibility; and the reduction of the aperture number will compress the size of the Airy disk, and thus have a higher resolution limit. However, when FNO>1.6, in the case of insufficient light, it is not conducive to solve the problem of vignetting around the imaging surface, and the effect of enhancing the shooting ability is poor; when FNO<1.3, the optical entrance pupil is large, easily contaminated with dust, and The design is difficult, which is not conducive to mass production.

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

|SLOM52|/f＜7.6°/mm;

Wherein, SOLM52 is the angle between the tangent plane of the effective diameter edge of the image side 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 relationship: 4.6<f<5.7. With eight lenses, the field of view of the optical imaging system 10 can reach 91 degrees, which is helpful for shooting sports videos with a smaller visual angle. The field angle is sacrificed to obtain a good sports shooting effect; the angle between the cut surface of the edge of the effective diameter of the fifth lens and the plane perpendicular to the optical axis is kept within a reasonable processing range, and there is no obvious inflection. It helps the smooth transition of edge light, and the risk of stray light is small; in addition, the thickness of the edge and the middle of the fifth lens is uniform, which is conducive to the molding process.

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

3.0mm＜(R61/|R62|)*|f6|＜148.0mm;

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

In this way, by changing the curvature radius of the object side S12 and the image side S13 of the sixth lens L6, the surface shape of the sixth lens L6 can be changed. For example, the surface shapes of the sixth lens L6 are W-shaped and C-shaped, where W The shape of the surface is easy to deflect the light of each field of view at a reasonable angle, which helps to reduce the sensitivity of optical performance and improve the relative illuminance; the C-shaped surface can better improve the compactness between the lenses and reduce the optical performance. The overall thickness of the imaging system 10 also has good optical characteristics; and by changing the refractive power of the sixth lens L6, in conjunction with other lenses, the overall aberration of the optical imaging system 10 can be balanced and the overall resolution can be improved.

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

(R71/|R72|)*|SLOM41|＜9.2°;

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

In this way, the seventh lens L7 has a W-shaped arrangement structure, and the aspheric surface introduces fewer high-order terms, which does not cause drastic changes in its surface shape. The inclination angle and thickness are reasonable, and it has good processing characteristics; , the angle of the final incident imaging surface is small, which is conducive to the matching of chips; in addition, the change of the 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 object side The change of the surface shape correspondingly enhances the cooperation effect of the fourth lens L4 and the third lens L3, helps to reduce stray light ghost images caused by light reflection, and improves 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 of the first lens L1 and the effective diameter edge of the image side in the optical axis direction, and ET2 is the effective diameter edge of the object side S4 of the second lens L2 and the effective diameter edge of the image side. The distance in the optical axis direction, ET3 is the distance between the effective diameter edge of the object side S6 of the third lens L3 and the effective diameter edge of the image side S7 in the optical axis direction, ET4 is the effective diameter edge of the object side S8 of the fourth lens L4 The distance from the effective diameter edge of its image side S9 in the optical axis direction, CT1 is the distance from the object side S2 of the first lens L1 to its image side S3 on the optical axis, and CT2 is the object side S4 of the second lens L2 to its image The distance of the side S5 on the optical axis, CT3 is the distance from the object side S6 of the third lens L3 to its image side S7 on the optical axis, CT4 is the object side S8 of the fourth lens L4 to its image side S9 on the optical axis the distance.

In this way, the rationality of the thickness and the gap is related to the difficulty of forming and manufacturing the lens. When the above formula is satisfied, the thickness of the first lens L1 to the fourth lens L4 can be made appropriate, and the distance between the lenses is reasonable, which can effectively improve the lens. The compactness of the structure is conducive to the molding and assembly of the lens; in addition, the first lens L1 to the fourth lens L4 are combined together to resemble a positive lens. With the reduction of the effective diameter edge thickness and the compression of the aperture, it can provide light with a large field of view. With reasonable deflection and uniform primary aberrations, it helps to improve assembly yield and overall aberration balance.

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

0.19＜ET78/CT78＜0.45;

Wherein, ET78 is the distance from the effective diameter edge of the image side S14 of the seventh lens L7 to the effective diameter edge of the object side S15 of the eighth lens L8 in the direction of the optical axis, and CT78 is the distance between the image side S14 of the seventh lens L7 and the optical axis The distance from the intersection to the intersection of the object side surface S16 of the eighth lens L8 and the optical axis in the optical axis direction.

In this way, the reasonable maintenance of the gap distance between the seventh lens L7 and the eighth lens L8 can avoid excessive bending of the angle between the seventh lens L7 and the eighth lens L8, which is beneficial to correct the aberration generated by the optical imaging system 10 under a large aperture, so that the The refractive power in the direction perpendicular to the optical axis is evenly distributed, which helps to improve the overall image quality and is easy to shape and manufacture.

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

In this way, the thickness of the middle and the edge of the fifth lens L5 to the seventh lens L7 are reasonable, and the surface shape change will not be too large, so that the optical imaging system has good molding characteristics; and the fifth lens L5 to the seventh lens L7 introduce the primary image The aberration is uniform and the overall balance of the aberration is easy. Through reasonable changes in the surface shape and refractive power, it can provide support for the improvement of the image quality of the large image plane; in addition, the advanced aberration amount is controllable, and the optical performance of the optical imaging system is sensitive. Sex can be effectively controlled.

first embodiment

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

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

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

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

Table 1

It should be noted that f is the focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the imaging from the object side of the first lens to the optical imaging system The distance of the face on the optical axis.

Table 2

FIG. 2 shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the first embodiment, wherein the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical imaging system 10 ; The astigmatism curve represents the meridional image plane curvature and the sagittal image plane curvature; the distortion curve represents the corresponding distortion value for different field angles. It can be seen from FIG. 2 that the optical imaging system 10 provided in the first embodiment can achieve good imaging quality.

Second Embodiment

Referring to FIG. 3 , the optical imaging system 20 of the second embodiment sequentially includes a diaphragm STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, and a positive refractive power The third lens L3, the fourth lens L4 with positive refractive power, the fifth lens L5 with negative refractive power, the sixth lens L6 with positive refractive power, the seventh lens L7 with positive refractive power, the negative refractive power The eighth lens L8 and the infrared filter L9.

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

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

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

table 3

It should be noted that f is the focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the imaging from the object side of the first lens to the optical imaging system The distance of the face on the optical axis.

Table 4

FIG. 4 shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the second embodiment, wherein the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical imaging system 10 ; The astigmatism curve represents the meridional image plane curvature and the sagittal image plane curvature; the distortion curve represents the corresponding distortion value for different field angles. It can be seen from FIG. 4 that the optical imaging system 10 provided in the second embodiment can achieve good imaging quality.

Third Embodiment

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

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

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

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

table 5

It should be noted that f is the focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the imaging from the object side of the first lens to the optical imaging system The distance of the face on the optical axis.

Table 6

FIG. 6 shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the third embodiment, wherein the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical imaging system 10 ; The astigmatism curve represents the meridional image plane curvature and the sagittal image plane curvature; the distortion curve represents the corresponding distortion value for different field angles. It can be seen from FIG. 6 that the optical imaging system 10 provided in the third embodiment can achieve good imaging quality.

Fourth Embodiment

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

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

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

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

Table 7

It should be noted that f is the focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the imaging from the object side of the first lens to the optical imaging system The distance of the face on the optical axis.

Table 8

FIG. 8 shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the fourth embodiment, wherein the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical imaging system 10 ; The astigmatism curve represents the meridional image plane curvature and the sagittal image plane curvature; the distortion curve represents the corresponding distortion value for different field angles. It can be seen from FIG. 8 that the optical imaging system 10 provided in the fourth embodiment can achieve good imaging quality.

Fifth Embodiment

Referring to FIGS. 9 and 10 , the optical imaging system 50 of the fifth embodiment sequentially includes a diaphragm STO, a first lens L1 with a positive refractive power, a second lens L2 with a negative refractive power, and a The third lens L3 with negative refractive power, the fourth lens L4 with positive refractive power, the fifth lens L5 with positive refractive power, the sixth lens L6 with negative refractive power, the seventh lens L7 with positive refractive power, the The eighth lens L8 with negative refractive power and the infrared filter L9.

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

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

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

Table 9

It should be noted that f is the focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the imaging from the object side of the first lens to the optical imaging system The distance of the face on the optical axis.

Table 10

FIG. 10 shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the fifth embodiment, wherein the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical imaging system 10 ; The astigmatism curve represents the meridional image plane curvature and the sagittal image plane curvature; the distortion curve represents the corresponding distortion value for different field angles. It can be seen from FIG. 10 that the optical imaging system 10 provided in the fifth embodiment can achieve good imaging quality.

Sixth Embodiment

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

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

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

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

Table 11

It should be noted that f is the focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the imaging from the object side of the first lens to the optical imaging system The distance of the face on the optical axis.

Table 12

FIG. 12 shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the sixth embodiment, wherein the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical imaging system 10 ; The astigmatism curve represents the meridional image plane curvature and the sagittal image plane curvature; the distortion curve represents the corresponding distortion value for different field angles. It can be seen from FIG. 12 that the optical imaging system 10 provided in the sixth embodiment can achieve good imaging quality.

Table 13 shows TTL/(IMGH*2), (|f2|+|f3|)/FNO, |SLOM52|/f, (R61/| in the optical imaging systems 10 of the first to sixth embodiments R62|)*|f6|, (R71/|R72|)*|SLOM41|, (ET1+ET2+ET3+ET4)/(CT1+CT2+CT3+CT4), ET78/CT78 and (ET5+ET6+ET7 )/CT57 value.

Form 15

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

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

By using eight lenses, the optical imaging system 10 in the imaging module 100 of the embodiment of the present application 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 is conducive to the realization of optical The miniaturization of the imaging system 10; by properly configuring the value of TTL/IMGH, it is helpful to improve the resolution of the optical imaging system 10 in the center field of view and the edge field of view, so that it has high pixels, especially for the edge field of view image quality improvement.

Please continue to refer to FIG. 13 , the electronic device 1000 of the embodiment of the present application includes a housing 200 and an imaging module 100, and the imaging module 100 is installed on the housing 200 for acquiring images.

The electronic device 1000 in the embodiment of the present application includes, but is not limited to, a smartphone, a car camera 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, Imaging-enabled electronic devices such as digital still cameras, mobile medical devices, wearable devices, etc.

The optical optical imaging system 10 in the electronic device 1000 of the above-mentioned embodiment adopts eight lenses to reasonably configure the refractive power of each lens, and reduce the surface complexity of each lens, so that the total optical length is small, which is conducive to the realization of the optical imaging system. The miniaturization of 10; by reasonably configuring the value of TTL/IMGH, it helps to improve the resolution of the optical imaging system 10 in the center field of view and the edge field of view, so that it has high pixels, especially for the improvement of the image quality of the edge field of view .

It will be apparent to those skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Accordingly, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the application is to be defined by the appended claims rather than the foregoing description, which is therefore intended to fall within the scope of the claims. All changes within the meaning and scope of the equivalents of , are included in this application.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application rather than limitations. Although the present application has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present application can be Modifications or equivalent substitutions can be made without departing from the spirit and scope of the technical solutions of the present application.

Claims (11)

1. An optical imaging system, characterized in that, from the object side to the image side, it comprises:

   A first lens with positive refractive power, the object side of the first lens is convex at the near optical axis, and the image side is concave at the near optical axis;

   A second lens with refractive power, the object side of the second lens is convex at the near optical axis, and the image side is concave at the near optical axis;

   a third lens having refractive power;

   The fourth lens with positive refractive power, the object side of the fourth lens is convex at the near optical axis, and the image side is convex at the near optical axis;

   a fifth lens with refractive power;

   a sixth lens with refractive power;

   a seventh lens with positive refractive power;

   The eighth lens with negative refractive power, the object side of the eighth lens is concave at the near optical axis, the object side and the image side of the eighth lens are aspherical, and the object side and the image side of the eighth lens are aspherical. At least one face is provided with at least one inflection point;

   The optical imaging system satisfies the following relationship:

   0.6＜TTL/(IMGH*2)≤0.7;

   Wherein, TTL is the distance on the optical axis from the object side of the first lens to the imaging plane of the optical imaging system, and IMGH is half of the image height corresponding to the maximum angle of view of the optical imaging system.
2. The optical imaging system according to claim 1, wherein the object side of the third lens is convex at the near optical axis, and the image side is concave at the near optical axis; the object side of the fifth lens is Concave surface, and its object side and image side are both aspherical; the object side of the sixth lens is convex at the near optical axis, and its object side and image side are both aspherical; the object side of the seventh lens It is a convex surface at the near optical axis, and the object side and the image side of the seventh lens are both aspherical surfaces; at least one of the object side and the image side of the fifth lens to the seventh lens is provided with at least one Inflection point.
3. 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 the effective focal length of the second lens, f3 is the effective focal length of the third lens, and FNO is the aperture number of the optical imaging system.
4. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following relationship:

   |SLOM52|/f＜7.6°/mm;

   Wherein, SOLM52 is the angle between the tangent plane of the effective diameter edge of the image side of the fifth lens and the plane perpendicular to the optical axis, and f is the effective focal length of the optical imaging system.
5. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following relation:

   3.0mm＜(R61/|R62|)*|f6|＜148.0mm;

   Wherein, R61 is the radius of curvature of the object side of the sixth lens at the optical axis, R62 is the radius of curvature of the image side of the sixth lens at the optical axis, and f6 is the effective focal length of the sixth lens.
6. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following relationship:

   (R71/|R72|)*|SLOM41|＜9.2°;

   Wherein, R71 is the radius of curvature of the object side of the seventh lens at the optical axis, R72 is the radius of curvature of the image side of the seventh lens at the optical axis, and SLOM41 is the effective radius of the object side of the fourth lens The angle between the tangent plane of the radial edge and the plane perpendicular to the optical axis.
7. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following relation:

   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 of the first lens and the effective diameter edge of the image side in the optical axis direction, and ET2 is the effective diameter edge of the object side of the second lens and the effective diameter of the image side. The distance of the edge in the direction of the optical axis, ET3 is the distance between the effective diameter edge of the object side of the third lens and the effective diameter edge of the image side in the optical axis direction, ET4 is the effective diameter edge of the object side of the fourth lens The distance from the effective diameter edge of its image side in the direction of the optical axis, CT1 is the distance from the object side of the first lens to its image side on the optical axis, and CT2 is the object side of the second lens to its image side. The distance on the optical axis, CT3 is the distance on the optical axis from the object side of the third lens to its image side, and CT4 is the distance on the optical axis from the object side of the fourth lens to its image side.
8. 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 from the effective diameter edge of the image side of the seventh lens to the effective diameter edge of the object side of the eighth lens in the direction of the optical axis, and CT78 is the distance between the image side and the optical axis of the seventh lens. The distance from the intersection to the intersection of the object side surface of the eighth lens and the optical axis in the direction of the optical axis.
9. 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 of the fifth lens and the effective diameter edge of the image side in the optical axis direction, and ET6 is the effective diameter edge of the object side of the sixth lens and the effective diameter of the image side. The distance of the edge in the direction of the optical axis, ET7 is the distance between the effective diameter edge of the object side of the seventh lens and the effective diameter edge of the image side in the direction of the optical axis, and CT57 is the distance between the object side of the fifth lens and the optical axis. The distance from the intersection to the intersection of the image side surface of the seventh lens and the optical axis in the direction of the optical axis.
10. An imaging module, comprising:

    The optical imaging system of any one of claims 1 to 9; and

    A photosensitive element, the photosensitive element is arranged on the image side of the optical imaging system.
11. An electronic device, comprising:

    the shell; and

    The imaging module of claim 10, wherein the imaging module is mounted on the casing.

Images