CN111983786A

CN111983786A - Optical imaging system, image capturing module and electronic device

Info

Publication number: CN111983786A
Application number: CN202010956301.7A
Authority: CN
Inventors: 杨健; 李明
Original assignee: OFilm Tech Co Ltd
Current assignee: Nanchang OFilm Precision Optical Products Co Ltd; OFilm Group Co Ltd
Priority date: 2020-09-11
Filing date: 2020-09-11
Publication date: 2020-11-24

Abstract

The invention provides an optical imaging system, an image capturing module and an electronic device, wherein the optical imaging system sequentially comprises from an object side to an image side: the optical lens comprises a first lens element with positive refractive power, a second lens element with negative refractive power, and a third lens element with positive refractive power, wherein the object-side surface of the first lens element is convex at the optical axis; a second lens element with refractive power; a third lens element with refractive power; a fourth lens element with positive refractive power having a convex image-side surface along an optical axis; a fifth lens element with refractive power; a sixth lens element with refractive power having a convex object-side surface and a concave image-side surface; the optical imaging system satisfies: 0.5< f1/f26< 1.6; wherein f26 is a combined focal length of the second, third, fourth, fifth, and sixth lenses, and f1 is an effective focal length of the first lens. The optical imaging system has the advantages of wide visual angle and head miniaturization.

Description

Optical imaging system, image capturing module and electronic device

Technical Field

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

Background

In recent years, full-screen mobile phones are gradually advocated by consumers, and the visible high screen ratio has become a development trend of mobile phones, under the trend, the size of a camera lens of the mobile phone is required to be miniaturized, and high imaging quality is also required to be ensured, so that the specification requirement on the camera lens is higher and higher.

In the process of implementing the present application, the inventor finds that at least the following problems exist in the prior art: although the traditional camera lens carried on the portable electronic product can meet the miniaturization requirement, the head of the camera lens is large, the camera lens is not beneficial to under-screen packaging of the camera lens, and the opening of the screen is large, so that the visual effect of a full screen cannot be achieved.

Disclosure of Invention

In view of the above, it is desirable 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, sequentially from an object side to an image side, comprising: the optical lens comprises a first lens element with positive refractive power, a second lens element with negative refractive power, and a third lens element with positive refractive power, wherein the object-side surface of the first lens element is convex at the optical axis; a second lens element with refractive power; a third lens element with refractive power; a fourth lens element with positive refractive power having a convex image-side surface along an optical axis; a fifth lens element with refractive power; a sixth lens element with refractive power having a convex object-side surface and a concave image-side surface; the optical imaging system satisfies the following relation: 0.5< f1/f26< 1.6; wherein f26 is a combined focal length of the second, third, fourth, fifth, and sixth lenses, and f1 is an effective focal length of the first lens.

The optical imaging system has the advantages of wide visual angle and head miniaturization through reasonable refractive power configuration and surface type arrangement. On one hand, the opening size of the screen of the electronic device can be reduced on the premise of ensuring the high imaging quality of the optical imaging system, so that the under-screen packaging of the optical imaging system is facilitated, and the electronic device can achieve the visual effect of a full screen; on the other hand, in the shooting effect, because the optical imaging system has a larger field angle, a wider field of view can be obtained, foreground objects are highlighted, and the shooting experience of a user is met. Further, the above formula is satisfied, the small-headed characteristic of the optical imaging system can be ensured, if the first lens has a negative focal length, the diaphragm must be arranged in the middle to achieve good performance, so that the aperture of the first lens is increased, and the small-headed characteristic cannot be satisfied; if the ratio is too large, i.e. the focal length of the first lens is too large, the optical focus is distributed to the following lenses, the sensitivity is increased, and the assembly is not favorable for mass production.

In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens have aspheric image-side and object-side surfaces.

Therefore, the aspheric surface is beneficial to correcting aberration and improving the imaging quality.

In some embodiments, the optical imaging system satisfies the following relationship: TTL/Imgh is less than 1.8; wherein, TTL is a distance on an optical axis from an object-side surface of the first lens element to an image plane of the optical imaging system, and Imgh is half of an image height corresponding to a maximum field angle of the optical imaging system. The image surface fixing method meets the above formula, and the ratio of TTL to Imgh is less than 1.8, so that the total length of the system can be ensured under the condition of image surface fixing, and the miniaturization requirement is realized.

In some embodiments, the optical imaging system satisfies the following relationship: 1.4< TTL/f < 2; wherein, TTL is a distance on an optical axis from an object side surface of the first lens element to an image plane of the optical imaging system, and f is an effective focal length of the optical imaging system. The method meets the above formula, which is helpful for determining the optional range of the focal length under the condition that the total length of the system meets the miniaturization requirement, and if the total length of the system is higher than the upper limit, the same total length of the field angle system is larger, which is not beneficial to miniaturization; if the value is lower than the lower limit, the optical system tends to be in a long focus, so that the angle of the field of view is small, and enough object information cannot be acquired.

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

tan (hfov) > 1.05; wherein the HFOV is half of a maximum field angle of the optical imaging system. Reasonably selecting the ratio to keep the wide angle and small head characteristics of the optical imaging system; if the ratio is too small, the FOV is too small to realize the wide-angle characteristic, and at the same time, the focal length is increased, and the aperture of the first lens is increased, and the small-head characteristic cannot be satisfied.

In some embodiments, the optical imaging system satisfies the following relationship: FNO < 2.8; wherein FNO is an f-number of the optical imaging system. Satisfying the above formula, a large amount of light flux of the optical imaging system can be achieved at the same time in the case of satisfying a small head. When the luminous flux of the optical imaging system in unit time is large, the imaging effect can be clear even if the optical imaging system shoots in a dark environment. If the FNO is too large, on one hand, the diffraction limit is reduced, on the other hand, the luminous flux is reduced, and the shooting in a darker environment is not facilitated.

In some embodiments, the optical imaging system satisfies the following relationship: (L61-L62)/(2 x L63) > 0.25, wherein L61 represents the maximum perpendicular distance from the optical axis of the intersection point of the fringe field of view, which is a light beam incident and condensed to the farthest point from the optical axis of the imaging plane of the optical imaging system, with the image side surface of the sixth lens, and L62 represents the minimum perpendicular distance from the optical axis of the intersection point of the fringe field of view, which is a light beam incident and condensed to the image side surface of the sixth lens; l63 denotes the maximum perpendicular distance from the optical axis of the intersection of the central field of view, which is a light beam incident and converging to the center of the imaging plane of the optical imaging system, and the image side surface of the sixth lens. The above formula is satisfied, the relative brightness of the optical imaging system is favorably ensured, and the edge of the optical imaging system can also achieve a clear imaging effect even if the image is shot in a dark environment. If the formula is not satisfied, a dark corner may be generated, which is not favorable for stable mass production in the later period.

In some embodiments, the optical imaging system satisfies the following relationship: (r11+ r12)/(r11-r12) < 15; wherein r11 is a curvature radius of an object side surface of the sixth lens element at an optical axis, and r12 is a curvature radius of an image side surface of the sixth lens element at the optical axis. Satisfying the above formula, the optical imaging system can be well matched with the Chief Ray Angle (CRA) of the photosensitive element. If the ratio requirement is not met, the CRA of the inner view field cannot be enlarged, the matching with the CRA of the photosensitive element has problems, and the requirement of mass production cannot be met.

In some embodiments, the optical imaging system further comprises a stop located on an object side of the first lens.

Therefore, the position of the diaphragm in the whole optical imaging system is forward, so that the optical imaging system has a telecentric effect, the efficiency of the photosensitive element for receiving images can be increased, and the imaging quality is improved.

In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all made of plastic.

Thus, the plastic lens can reduce the weight of the optical imaging system and reduce the production cost.

An embodiment of the present invention provides an image capturing module, including the optical imaging system according to any of the above embodiments; and the photosensitive element is arranged on the image side of the optical imaging system.

The image capturing module comprises an optical imaging system, and has the advantages of wide visual angle and head miniaturization through reasonable refractive power configuration and surface type arrangement. On one hand, the opening size of the screen of the electronic device can be reduced on the premise of ensuring the high imaging quality of the optical imaging system, so that the under-screen packaging of the optical imaging system is facilitated, and the electronic device can achieve the visual effect of a full screen; on the other hand, in the shooting effect, because the optical imaging system has a larger field angle, a wider field of view can be obtained, foreground objects are highlighted, and the shooting experience of a user is met.

An embodiment of the present invention provides an electronic device, including: the casing with the module of getting for instance of above-mentioned embodiment, get for instance the module and install on the casing.

The electronic device comprises the image capturing module, an optical imaging system in the image capturing module has the advantages of wide visual angle and head miniaturization, and the size of an opening of a screen of the electronic device is reduced on the premise of ensuring high imaging quality of the optical imaging system, so that the under-screen packaging of the optical imaging system is facilitated, and the electronic device can achieve the visual effect of a full screen; in the shooting effect, the optical imaging system has a larger field angle, so that a wider field of view can be obtained, foreground objects are highlighted, and the shooting experience of a user is met. The electronic device not only has better imaging capability, but also can improve the screen occupation ratio.

Drawings

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 schematic view of spherical aberration (mm), astigmatism (mm), and distortion (%) of the optical imaging system in the first embodiment of the present 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 schematic view of spherical aberration (mm), astigmatism (mm), and distortion (%) of an optical imaging system in a second embodiment of the present 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 schematic view of spherical aberration (mm), astigmatism (mm), and distortion (%) of an optical imaging system in a third embodiment of the present 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 schematic view of spherical aberration (mm), astigmatism (mm), and distortion (%) of an optical imaging system in a fourth embodiment of the present 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 schematic view of spherical aberration (mm), astigmatism (mm), and distortion (%) of an optical imaging system in a fifth embodiment of the present 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 schematic view of spherical aberration (mm), astigmatism (mm), and distortion (%) of an optical imaging system in a sixth embodiment of the present invention.

Fig. 13 is a schematic structural diagram of an image capturing module according to an embodiment of the invention.

Fig. 14 is a schematic structural diagram of an electronic device according to an embodiment of the invention.

Description of the main elements

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

Infrared filter L7

Stop STO

Object sides S1, S3, S5, S7, S9, S11, S13

Like sides S2, S4, S6, S8, S10, S12, S14

Image plane S15

Photosensitive element 20

Housing 200

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to 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", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

First, terms related to embodiments of the present application are explained:

field of view (FOV): in an optical device, an angle formed by two edges of a lens, at which an object image of a subject can pass through the maximum range, is called a field of view. The size of the field of view determines the field of view of the optical instrument, the larger the field of view. That is, objects within the field of view may be captured through the lens, while objects outside the field of view are not visible. The whole visual range corresponds to an imaging surface of an optical instrument one by one, N parts are uniformly distributed outwards from an optical axis on the imaging surface, light rays of a central view field are converged at the optical axis and recorded as a 0 view field, light rays of an edge view field are converged at the farthest point of an off-axis and recorded as a 1.0 view field, 0-0.5 is an inner view field, and 0.6-1.0 is an outer view field.

Referring to fig. 1, the optical imaging system 10 according to the embodiment of the present 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 refractive power; a third lens element L3 with refractive power; a fourth lens element L4 with positive refractive power; a fifth lens element L5 with refractive power; and a sixth lens element L6 with refractive power.

The first lens element L1 has an object-side surface S1 and an image-side surface S2, the object-side surface S1 being convex at the optical axis; the second lens L2 has an object-side surface S3 and an image-side surface S4; the third lens L3 has an object-side surface S5 and an image-side surface S6, the fourth lens L4 has an object-side surface S7 and an image-side surface S8, and the image-side surface S8 is convex on the optical axis; the fifth lens L5 has an object-side surface S9 and an image-side surface S10; the sixth lens element L6 has an object-side surface S11 and an image-side surface S12, wherein the object-side surface S11 is convex along the optical axis, and the image-side surface S12 is concave along the optical axis. In addition, the image side of the optical imaging system 10 has an image plane S15, and preferably, the image plane S15 may be a receiving surface of the photosensitive element.

The optical imaging system 10 satisfies the following relationship:

tan(HFOV)>1.05；

the HFOV is a half of the maximum field angle of the optical imaging system 10, that is, tan (HFOV) may be any value greater than 1.05, for example, 1.21, 1.22, or the like.

The optical imaging system 10 has the advantages of wide viewing angle and small head size through reasonable refractive power configuration and surface type arrangement. On one hand, on the premise of ensuring high imaging quality of the optical imaging system 10, the size of the opening of the screen of the electronic device can be reduced, so that the optical imaging system 10 can be conveniently packaged under the screen, and the visual effect of a full screen is achieved; on the other hand, in terms of shooting effect, because the optical imaging system 10 has a larger field angle, a wider field of view can be obtained, foreground objects are highlighted, and the shooting experience of the user is met.

Satisfying the above formula, the wide angle and small head characteristics of the optical imaging system 10 can be maintained; if this value is too small, the field angle FOV is too small to achieve wide-angle characteristics, and at the same time, the focal length increases, and the aperture of the first lens L1 increases, and small-head characteristics are not satisfied.

When the optical imaging system 10 is used for imaging, light rays emitted or reflected by a subject enter the optical imaging system 10 from the object side direction, sequentially pass through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6, and finally converge on the image surface S15.

In some embodiments, optical imaging system 10 further includes an infrared filter L7, infrared filter L7 having an object side S13 and an image side S14. The infrared filter L7 is disposed on the image side S12 of the sixth lens L6, and the infrared filter L7 is used for filtering the light of the image, specifically isolating the infrared light, and preventing the infrared light from being received by the photosensitive element, so as to prevent the infrared light from affecting the color and the definition of the normal image, and further improve the imaging quality of the optical imaging system 10.

In some embodiments, the optical imaging system 10 further includes a stop STO. The stop STO may be disposed on the object side of the first lens L1, between the sixth lens L6 and the infrared filter L7, between any two lenses, or on the surface of any one lens. The stop STO is used to reduce stray light, which is helpful to improve image quality. Preferably, the stop STO is disposed before the first lens L1. In some embodiments, the stop STO is disposed on the object side of the first lens L1, i.e. the stop STO is disposed between the object and the first lens L1, or on the object side of the first lens L1, and the stop STO is located at a forward position in the whole optical imaging system 10, so that the optical imaging system 10 has a telecentric effect, and the efficiency of the photosensitive elements for receiving images can be increased, thereby improving the imaging quality.

In some embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all made of plastic, and in this case, the plastic lens can reduce the weight of the optical imaging system 10 and reduce the production cost.

In some embodiments, the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5 and the sixth lens element L6 are made of glass, so that the optical imaging system 10 can endure higher temperature and has better optical performance. In other embodiments, only the first lens L1 may be made of glass, and the other lenses may be made of plastic, in which case, the first lens L1 closest to the object side can better adapt to the influence of the ambient temperature at the object side, and the production cost of the optical imaging system 10 is kept low because the other lenses are made of plastic. Alternatively, in some embodiments, the material of the first lens L1 is glass, and the materials of the other lenses can be combined arbitrarily. In this way, the optical imaging system 10 can realize ultra-thinning while correcting aberration and solving the temperature drift and the like through reasonable configuration of the material of the lens, and the cost is low.

In some embodiments, at least one surface of at least one lens in the optical imaging system 10 is aspheric. For example, in some embodiments, the image-side surface and the object-side surface of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 in the optical imaging system 10 are aspheric. The aspheric surface is beneficial to correcting aberration and improving imaging quality.

The aspherical surface has a surface shape determined by the following formula:

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

In this way, the optical imaging system 10 can effectively reduce the size of the optical imaging system 10, effectively correct aberration, and improve imaging quality by adjusting the curvature radius and aspheric coefficients of each lens surface.

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

TTL/Imgh<1.8；

wherein TTL is a distance (total system length) from the object-side surface S1 of the first lens element L1 to the image plane S15 of the optical imaging system 10 on the optical axis, and Imgh is half of an image height corresponding to the maximum field angle of the optical imaging system, that is, TTL/Imgh may be any value less than 1.8, for example, 1.37, 1.40, 1.41, 1.40, 1.42, 1.37, and the like.

The image surface S15 is fixed, the total length of the system can be ensured, and the miniaturization requirement is realized; if the ratio requirement is not met, the total length of the system is too long, and miniaturization cannot be realized.

1.4<TTL/f<2；

wherein, TTL is an axial distance from the object-side surface S1 of the first lens element L1 to the image plane S15 of the optical imaging system 10, and f is an effective focal length of the optical imaging system 10. That is, TTL/f can be any value within the range of (1.4, 2), for example, 1.63, 1.64, 1.67, 1.68, 1.70, etc.

The method meets the formula, is beneficial to determining the optional range of the focal length under the condition that the total length of the system meets the miniaturization requirement, and if the optional range is not met, the small focal length can cause the large field angle, so that the longer total length of the system is required; too large focal length will result in a smaller field angle, and the overall length of the system will be increased accordingly to meet the performance requirement.

0.5<f1/f26<1.6；

wherein f26 is a combined focal length of the second lens L2 to the sixth lens L6, that is, a combined focal length of the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6, and f1 is an effective focal length of the first lens L1. That is, f1/f26 may be any value within the range of (0.5, 1.6), for example, 1.02, 1.21, 0.96, 1.14, 1.46, 1.26, etc.

The above formula is satisfied, the small-head of the optical imaging system 10 can be ensured, if the first lens L1 has a negative focal length, the diaphragm must be arranged in the middle to achieve good performance, so that the aperture of the first lens L1 is increased, and the small-head requirement cannot be satisfied; if the ratio is too large, i.e. the focal length of the first lens L1 is too large, the optical focus will be distributed to the next few lenses, the sensitivity will increase, and the assembly is not easy.

FNO<2.8；

wherein FNO is the f-number of the optical imaging system 10. That is, FNO may be any value less than 2.8, for example, 2.45, 2.60, and the like.

Satisfying the above equation, a large amount of light flux of the optical imaging system 10 can be achieved at the same time in the case of satisfying a small head. When the light flux of the optical imaging system 10 per unit time is large, a clear imaging effect can be achieved even when shooting is performed in a dark environment. If the FNO is too large, on one hand, the diffraction limit is reduced, on the other hand, the luminous flux is reduced, and the shooting in a darker environment is not facilitated.

(L61-L62)/(2*L63)＞0.25；

referring to fig. 1 again, L61 represents the maximum vertical distance from the optical axis of the intersection point of the marginal field of view and the image-side surface S12 of the sixth lens L6, and L62 represents the minimum vertical distance from the optical axis of the intersection point of the marginal field of view and the image-side surface S12 of the sixth lens L6, where the marginal field of view is the light beam incident and converging to the farthest point from the optical axis of the imaging surface of the optical imaging system 10; l63 denotes the maximum perpendicular distance from the optical axis of the intersection point where the central field of view, which is a light beam incident and condensed to the center of the imaging plane of the optical imaging system 10, and the image side surface of the sixth lens L6 is 2.

Satisfying the above formula is favorable to guaranteeing the relative luminance of optical imaging system 10, even shoot under darker environment, the edge of optical imaging system 10 also can reach clear formation of image effect. If the formula is not satisfied, a dark corner may be generated, which is not favorable for stable mass production in the later period.

(r11+r12)/(r11-r12)<15；

wherein r11 is a radius of curvature of the object-side surface S11 of the sixth lens L6 at the optical axis, and r12 is a radius of curvature of the image-side surface S12 of the sixth lens L6 at the optical axis. That is, (r11+ r12)/(r11-r12) may be any value less than 15, for example, values of-546.12, 5.09, 7.45, 7.82, 6.90, 10.30, etc.

Satisfying the above equation, the optical imaging system 10 can be well matched to the Chief Ray Angle (CRA) of the photosensitive element. If the ratio requirement is not met, the CRA of the inner view field cannot be enlarged, the matching with the CRA of the photosensitive element has problems, and the requirement of mass production cannot be met.

First embodiment

Referring to fig. 1 and fig. 2, an optical imaging system 10 of the first embodiment sequentially includes, from an object side to an image side: the stop STO, the first lens element L1 with positive refractive power, the second lens element L2 with positive refractive power, the third lens element L3 with negative refractive power, the fourth lens element L4 with positive refractive power, the fifth lens element L5 with negative refractive power, the sixth lens element L6 with negative refractive power, and the ir filter L7.

The object-side surface S1 of the first lens element L1 is convex along the optical axis, and the image-side surface S2 is convex along the optical axis; the object-side surface S3 of the second lens element L2 is convex along the optical axis, and the image-side surface S4 is concave along the optical axis; the object-side surface S5 of the third lens element L3 is convex along the optical axis, and the image-side surface S6 is concave along the optical axis; the object-side surface S7 of the fourth lens element L4 is concave along the optical axis, and the image-side surface S8 is convex along the optical axis; the object-side surface S9 of the fifth lens element L5 is concave along the optical axis, and the image-side surface S10 is concave along the optical axis; the object-side surface S11 of the sixth lens element L6 is convex along the optical axis, and the image-side surface S12 is concave along the optical axis.

The object-side surface S1 of the first lens element L1 is concave at the circumference, and the image-side surface S2 is convex at the circumference; the object-side surface S3 of the second lens element L2 is concave at the circumference, and the image-side surface S4 is convex at the circumference; the object-side surface S5 of the third lens element L3 is concave at the circumference, and the image-side surface S6 is convex at the circumference; the object-side surface S7 of the fourth lens element L4 is concave at the circumference, and the image-side surface S8 is concave at the circumference; the object-side surface S9 of the fifth lens element L5 is convex at the circumference, and the image-side surface S10 is concave at the circumference; the object-side surface S11 of the sixth lens element L6 is convex at the circumference, and the image-side surface S12 is convex at the circumference.

The object-side surface and the image-side surface of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are aspheric.

The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all made of plastic. The infrared filter L7 is made of glass.

The optical imaging system of the first embodiment satisfies the following conditions: tan (hfov) ═ 1.21, TTL/Imgh ═ 1.37, TTL/f ═ 1.63, f1/f26 ═ 1.02, FNO ═ 2.45, (L61-L62)/(2 × L63) ═ 0.32, and r11+ r12)/(r11-r12) ═ 6.90.

The reference wavelength in the first embodiment is 587nm, and the optical imaging system 10 in the first embodiment satisfies the conditions of the following table. The elements from the object plane to the image plane S15 are sequentially arranged in the order of the elements from top to bottom in table 1. The

surface numbers

1 and 2 are the object-side surface S1 and the image-side surface S2 of the first lens L1, respectively, that is, the surface with the smaller surface number is the object-side surface and the surface with the larger surface number is the image-side surface in the same lens. The Y radius in table 1 is the radius of curvature of the object-side surface or the image-side surface of the corresponding surface number at the optical axis. The first value in the "thickness" parameter column of the first lens element is the thickness of the lens element on the optical axis, and the second value is the distance from the image-side surface of the lens element to the object-side surface of the subsequent lens element on the optical axis. Table 2 is a table of relevant parameters of the aspherical surface of each lens in table 1, where K is a conic constant and Ai is a coefficient corresponding to the i-th high-order term in the aspherical surface type formula.

TABLE 1

It should be noted that EFL is a focal length of the optical imaging system 10, FNO is an f-number of the optical imaging system 10, FOV is a field angle of the optical imaging system 10, and TTL is a distance on an optical axis from the object-side surface S1 of the first lens L1 to the image surface S15 of the optical imaging system 10.

TABLE 2

Number of noodles	K	A4	A6	A8	A10	A12	A14	A16	A18	A20
											1	-1.7870	-0.0600	0.1264	-4.1726	47.2284	-326.0259	1390.0988	-3604.9844	5229.8543	-3266.4588
2	37.6561	-0.1839	-0.3966	3.0482	-21.5481	90.4546	-236.4204	377.7106	-336.7218	128.0101
											3	-67.2116	-0.0962	0.0920	-2.6518	9.6315	-20.8066	22.8802	-9.6364	0.0000	0.0000
4	-10.0684	-0.1382	0.5435	-2.4026	4.1061	-4.0947	2.4810	-0.7247	0.0000	0.0000
											5	82.1620	-0.4090	0.3399	0.3550	-7.0334	23.2957	-35.8331	29.3838	-12.4917	2.1538
6	4.4683	-0.3800	0.7279	-0.9424	-0.6307	3.5705	-4.6154	2.9129	-0.9283	0.1191
											7	-4.9879	-0.3642	1.2450	-0.8331	-2.6255	6.4317	-6.4658	3.4772	-0.9790	0.1131
8	-3.2284	-0.3486	1.2357	-3.3061	5.7262	-6.4636	4.7184	-2.1418	0.5498	-0.0609
											9	-99.0000	0.6052	-0.7182	0.3164	0.1107	-0.2469	0.1554	-0.0503	0.0084	-0.0006
10	1.1450	0.7799	-1.2381	1.0996	-0.6622	0.2696	-0.0715	0.0117	-0.0011	0.0000
											11	-4.5530	0.0804	-0.3427	0.2185	-0.0470	-0.0055	0.0048	-0.0010	0.0001	0.0000
12	-3.4095	-0.0536	-0.1144	0.1139	-0.0470	0.0107	-0.0014	0.0001	0.0000	0.0000

Where S in fig. 2 is an astigmatism curve in the sagittal direction and T is an astigmatism curve in the meridional direction.

Second embodiment

Referring to fig. 3 and fig. 4, the optical imaging system 10 of the second embodiment sequentially includes, from an object side to an image side: the stop STO, the first lens element L1 with positive refractive power, the second lens element L2 with positive refractive power, the third lens element L3 with negative refractive power, the fourth lens element L4 with positive refractive power, the fifth lens element L5 with negative refractive power, the sixth lens element L6 with negative refractive power, and the ir filter L7.

The object-side surface S1 of the first lens element L1 is convex along the optical axis, and the image-side surface S2 is concave along the optical axis; the object-side surface S3 of the second lens element L2 is convex along the optical axis, and the image-side surface S4 is convex along the optical axis; the object-side surface S5 of the third lens element L3 is concave along the optical axis, and the image-side surface S6 is concave along the optical axis; the object-side surface S7 of the fourth lens element L4 is concave along the optical axis, and the image-side surface S8 is convex along the optical axis; the object-side surface S9 of the fifth lens element L5 is concave along the optical axis, and the image-side surface S10 is concave along the optical axis; the object-side surface S11 of the sixth lens element L6 is convex along the optical axis, and the image-side surface S12 is concave along the optical axis.

The object-side surface S1 of the first lens element L1 is concave at the circumference, and the image-side surface S2 is convex at the circumference; the object-side surface S3 of the second lens element L2 is concave at the circumference, and the image-side surface S4 is convex at the circumference; the object-side surface S5 of the third lens element L3 is concave at the circumference, and the image-side surface S6 is convex at the circumference; the object-side surface S7 of the fourth lens element L4 is concave at the circumference, and the image-side surface S8 is concave at the circumference; the object-side surface S9 of the fifth lens element L5 is concave at the circumference, and the image-side surface S10 is concave at the circumference; the object-side surface S11 of the sixth lens element L6 is convex at the circumference, and the image-side surface S12 is convex at the circumference.

The optical imaging system 10 of the second embodiment satisfies the following conditions: tan (hfov) ═ 1.22, TTL/Imgh ═ 1.40, TTL/f ═ 1.67, f1/f26 ═ 1.21, FNO ═ 2.45, (L61-L62)/(2 × L63) ═ 0.36, (r11+ r12)/(r11-r12) ═ 7.45.

The reference wavelength in the second embodiment is 587nm, and the parameters of the optical imaging system 10 are given in tables 3 and 4, and the definitions of the parameters can be derived from the first embodiment, which is not repeated herein.

TABLE 3

TABLE 4

Number of noodles	K	A4	A6	A8	A10	A12	A14	A16	A18	A20
											1	-0.0679	-0.0506	0.2082	-6.4236	82.0765	-625.7980	2915.6074	-8167.2645	12640.0459	-8309.6402
2	18.3090	-0.1476	-0.2639	1.5520	-11.9852	51.3008	-135.3960	216.1839	-190.9766	71.4160
											3	-53.0210	-0.1065	0.0859	-2.1893	7.3737	-15.1756	15.2152	-5.6460	0.0000	0.0000
4	-99.0000	-0.1088	0.3497	-1.6846	2.7473	-2.3343	1.1099	-0.2827	0.0000	0.0000
											5	102.1620	-0.3556	0.6490	-2.5430	4.7712	-4.7187	4.2963	-4.7252	3.3502	-0.9415
6	5.4582	-0.3187	0.7611	-1.6909	2.0301	-1.3134	0.4973	-0.1491	0.0482	-0.0093
											7	1.6296	-0.2815	0.6731	0.4671	-3.9226	6.4685	-5.3301	2.4499	-0.6045	0.0629
8	-2.7974	-0.1772	0.3041	-0.4720	0.3579	0.0603	-0.3882	0.3362	-0.1243	0.0172
											9	-86.3552	0.5101	-0.5300	0.3000	-0.1164	0.0325	-0.0066	0.0009	-0.0001	0.0000
10	1.1450	0.6100	-0.7179	0.4711	-0.2081	0.0632	-0.0128	0.0017	-0.0001	0.0000
											11	-4.0089	0.1027	-0.2273	0.1099	-0.0189	-0.0015	0.0012	-0.0002	0.0000	0.0000
12	-3.1451	-0.0017	-0.1046	0.0692	-0.0217	0.0039	-0.0004	0.0000	0.0000	0.0000

Where S in fig. 4 is an astigmatism curve in the sagittal direction and T is an astigmatism curve in the meridional direction.

Third embodiment

Referring to fig. 5 and fig. 6, the optical imaging system 10 of the third embodiment sequentially includes, from an object side to an image side: the stop STO, the first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with negative refractive power, the fourth lens element L4 with positive refractive power, the fifth lens element L5 with negative refractive power, the sixth lens element L6 with negative refractive power, and the ir filter L7.

The object-side surface S1 of the first lens element L1 is convex along the optical axis, and the image-side surface S2 is convex along the optical axis; the object-side surface S3 of the second lens element L2 is concave along the optical axis, and the image-side surface S4 is convex along the optical axis; the object-side surface S5 of the third lens element L3 is convex along the optical axis, and the image-side surface S6 is concave along the optical axis; the object-side surface S7 of the fourth lens element L4 is concave along the optical axis, and the image-side surface S8 is convex along the optical axis; the object-side surface S9 of the fifth lens element L5 is concave along the optical axis, and the image-side surface S10 is concave along the optical axis; the object-side surface S11 of the sixth lens element L6 is convex along the optical axis, and the image-side surface S12 is concave along the optical axis.

The optical imaging system 10 of the third embodiment satisfies the following conditions: tan (hfov) ═ 1.21, TTL/Imgh ═ 1.41, TTL/f ═ 1.68, f1/f26 ═ 0.96, FNO ═ 2.45, (L61-L62)/(2 × L63) ═ 0.35, (r11+ r12)/(r11-r12) ═ 7.82.

TABLE 5

TABLE 6

Number of noodles	K	A4	A6	A8	A10	A12	A14	A16	A18	A20
											1	-0.1548	-0.0536	0.2682	-7.0831	84.6175	-612.2649	2737.1290	-7424.7654	11215.7032	-7245.7835
2	18.3090	-0.1339	-0.4101	3.6150	-26.4826	113.3799	-299.7440	478.0511	-421.5499	157.8797
											3	-53.0210	-0.0970	-0.0989	-0.6503	0.9122	-0.4579	-1.8420	2.0301	0.0000	0.0000
4	0.0000	-0.1446	0.1777	-0.0528	-1.7510	3.5047	-2.5702	0.6201	0.0000	0.0000
											5	82.1620	-0.3327	0.1698	-0.0786	-0.0583	-2.0626	8.1024	-11.3814	7.1299	-1.7077
6	5.3955	-0.2237	0.1286	0.3169	-1.6714	3.1036	-3.0028	1.6203	-0.4632	0.0545
											7	1.4299	-0.2005	0.2706	1.0861	-4.1876	6.2822	-5.1258	2.3978	-0.6060	0.0643
8	-2.7441	-0.1885	0.4402	-0.9810	1.4111	-1.3342	0.8039	-0.2889	0.0560	-0.0045
											9	-81.9399	0.4843	-0.4698	0.2121	-0.0439	-0.0038	0.0051	-0.0015	0.0002	0.0000
10	1.1450	0.6150	-0.7348	0.4776	-0.2053	0.0602	-0.0118	0.0015	-0.0001	0.0000
											11	-3.9232	0.1229	-0.2774	0.1616	-0.0482	0.0083	-0.0008	0.0000	0.0000	0.0000
12	-3.1147	0.0031	-0.1231	0.0870	-0.0305	0.0064	-0.0008	0.0001	0.0000	0.0000

Where S is an astigmatism curve in the sagittal direction and T is an astigmatism curve in the meridional direction in fig. 6.

Fourth embodiment

Referring to fig. 7 and fig. 8, an optical imaging system 10 according to the fourth embodiment sequentially includes, from an object side to an image side: the stop STO, the first lens element L1 with positive refractive power, the second lens element L2 with positive refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with positive refractive power, the fifth lens element L5 with negative refractive power, the sixth lens element L6 with positive refractive power, and the ir filter L7.

The object-side surface S1 of the first lens element L1 is convex along the optical axis, and the image-side surface S2 is concave along the optical axis; the object-side surface S3 of the second lens element L2 is concave along the optical axis, and the image-side surface S4 is convex along the optical axis; the object-side surface S5 of the third lens element L3 is concave along the optical axis, and the image-side surface S6 is convex along the optical axis; the object-side surface S7 of the fourth lens element L4 is concave along the optical axis, and the image-side surface S8 is convex along the optical axis; the object-side surface S9 of the fifth lens element L5 is concave along the optical axis, and the image-side surface S10 is concave along the optical axis; the object-side surface S11 of the sixth lens element L6 is convex along the optical axis, and the image-side surface S12 is concave along the optical axis.

The object-side surface S1 of the first lens element L1 is concave at the circumference, and the image-side surface S2 is convex at the circumference; the object-side surface S3 of the second lens element L2 is concave at the circumference, and the image-side surface S4 is convex at the circumference; the object-side surface S5 of the third lens element L3 is concave at the circumference, and the image-side surface S6 is convex at the circumference; the object-side surface S7 of the fourth lens element L4 is convex at the circumference, and the image-side surface S8 is concave at the circumference; the object-side surface S9 of the fifth lens element L5 is convex at the circumference, and the image-side surface S10 is concave at the circumference; the object-side surface S11 of the sixth lens element L6 is convex at the circumference, and the image-side surface S12 is convex at the circumference.

The optical imaging system 10 of the fourth embodiment satisfies the following conditions: tan (hfov) ═ 1.22, TTL/Imgh ═ 1.40, TTL/f ═ 1.70, f1/f26 ═ 1.14, FNO ═ 2.45, (L61-L62)/(2 × L63) ═ 0.37, (r11+ r12)/(r11-r12) ═ 546.12.

TABLE 7

TABLE 8

Number of noodles	K	A4	A6	A8	A10	A12	A14	A16	A18	A20
												1	0.2814	-0.0656	0.9673	-21.4019	252.706	-1805.146	7948.144	-21128.612	31112.477	-19498.847
2	23.9458	-0.1067	-0.6178	5.7570	-41.788	180.5160	-485.500	791.8068	-717.0294	277.0186
											3	-72.4485	-0.2156	0.8143	-5.1042	13.6959	-21.2027	14.0813	-1.7154	0.0000	0.0000
4	-84.8419	-0.2271	-0.6357	4.0767	-11.268	15.0536	-9.6033	2.3209	0.0000	0.0000
											5	98.2930	-0.1058	-1.1912	1.8132	5.9390	-33.8633	69.7828	-73.0219	38.6863	-8.2891
6	0.0000	0.2489	-1.5707	4.6091	-8.6466	10.0082	-7.0281	2.9181	-0.6596	0.0625
											7	-2.1692	-0.1644	-0.2831	3.5991	-9.0353	11.0663	-7.5944	2.9659	-0.6112	0.0509
8	-2.7599	-0.1491	-0.0578	0.6183	-1.2790	1.4617	-1.0608	0.4917	-0.1311	0.0151
											9	-33.8660	0.5104	-0.4649	0.1776	-0.0037	-0.0276	0.0127	-0.0028	0.0003	0.0000
10	1.1499	0.4149	-0.5284	0.3462	-0.1489	0.0432	-0.0083	0.0010	-0.0001	0.0000
											11	-3.6934	0.1465	-0.2715	0.1361	-0.0305	0.0022	0.0004	-0.0001	0.0000	0.0000
12	-3.4484	0.0604	-0.1698	0.0990	-0.0293	0.0052	-0.0006	0.0000	0.0000	0.0000

Where S is an astigmatism curve in the sagittal direction and T is an astigmatism curve in the meridional direction in fig. 8.

Fifth embodiment

Referring to fig. 9 and 10, an optical imaging system 10 of the fifth embodiment sequentially includes, from an object side to an image side: the stop STO, the first lens element L1 with positive refractive power, the second lens element L2 with positive refractive power, the third lens element L3 with negative refractive power, the fourth lens element L4 with positive refractive power, the fifth lens element L5 with positive refractive power, the sixth lens element L6 with negative refractive power, and the ir filter L7.

The object-side surface S1 of the first lens element L1 is convex along the optical axis, and the image-side surface S2 is convex along the optical axis; the object-side surface S3 of the second lens element L2 is convex along the optical axis, and the image-side surface S4 is concave along the optical axis; the object-side surface S5 of the third lens element L3 is convex along the optical axis, and the image-side surface S6 is concave along the optical axis; the object-side surface S7 of the fourth lens element L4 is concave along the optical axis, and the image-side surface S8 is convex along the optical axis; the object-side surface S9 of the fifth lens element L5 is convex along the optical axis, and the image-side surface S10 is concave along the optical axis; the object-side surface S11 of the sixth lens element L6 is convex along the optical axis, and the image-side surface S12 is concave along the optical axis.

The optical imaging system 10 of the fifth embodiment satisfies the following conditions: tan (hfov) ═ 1.21, TTL/Imgh ═ 1.42, TTL/f ═ 1.68, f1/f26 ═ 1.46, FNO ═ 2.45, (L61-L62)/(2 × L63) ═ 0.33, (r11+ r12)/(r11-r12) ═ 5.09.

TABLE 9

Watch 10

Number of noodles	K	A4	A6	A8	A10	A12	A14	A16	A18	A20
											1	-1.6629	-0.0664	0.2067	-5.2516	59.5857	-419.1291	1839.0705	-4920.9021	7357.4534	-4719.0323
2	33.7221	-0.1954	-0.4000	2.9819	-19.2743	76.5153	-189.9749	287.7766	-242.6256	86.8394
											3	-54.1010	-0.0587	-0.1987	-1.0023	4.1266	-9.6665	11.2839	-5.0713	0.0000	0.0000
4	-5.4404	-0.0256	-0.0235	-0.6321	1.1566	-1.2008	0.8675	-0.3159	0.0000	0.0000
											5	82.2121	-0.3343	0.2736	-0.5696	-0.6791	5.5090	-9.5442	7.7607	-3.1062	0.4837
6	4.7055	-0.2601	0.1734	0.1954	-1.4856	3.0051	-3.0220	1.6540	-0.4718	0.0547
											7	-6.5730	-0.0069	-0.3853	2.2805	-5.3730	6.7967	-5.0409	2.2047	-0.5270	0.0530
8	-2.3212	-0.2993	0.5507	-0.7872	0.7917	-0.5464	0.2513	-0.0764	0.0160	-0.0019
											9	-99.0000	0.1479	0.0832	-0.3588	0.3689	-0.2094	0.0727	-0.0154	0.0018	-0.0001
10	13.3429	0.5352	-0.6764	0.4632	-0.2085	0.0631	-0.0126	0.0016	-0.0001	0.0000
											11	-3.2313	0.0972	-0.2384	0.1393	-0.0410	0.0068	-0.0006	0.0000	0.0000	0.0000
12	-2.9546	-0.0190	-0.0877	0.0639	-0.0222	0.0046	-0.0006	0.0001	0.0000	0.0000

In fig. 10, S is an astigmatism curve in the sagittal direction, and T is an astigmatism curve in the meridional direction.

Sixth embodiment

Referring to fig. 11 and 12, an optical imaging system 10 of the sixth embodiment sequentially includes, from an object side to an image side: the stop STO, the first lens element L1 with positive refractive power, the second lens element L2 with positive refractive power, the third lens element L3 with negative refractive power, the fourth lens element L4 with positive refractive power, the fifth lens element L5 with negative refractive power, the sixth lens element L6 with positive refractive power, and the ir filter L7.

The object-side surface S1 of the first lens element L1 is convex along the optical axis, and the image-side surface S2 is convex along the optical axis; the object-side surface S3 of the second lens element L2 is convex along the optical axis, and the image-side surface S4 is concave along the optical axis; the object-side surface S5 of the third lens element L3 is convex along the optical axis, and the image-side surface S6 is concave along the optical axis; the object-side surface S7 of the fourth lens element L4 is convex along the optical axis, and the image-side surface S8 is convex along the optical axis; the object-side surface S9 of the fifth lens element L5 is concave along the optical axis, and the image-side surface S10 is concave along the optical axis; the object-side surface S11 of the sixth lens element L6 is convex along the optical axis, and the image-side surface S12 is concave along the optical axis.

The optical imaging system 10 of the sixth embodiment satisfies the following conditions: tan (hfov) ═ 1.21, TTL/Imgh ═ 1.37, TTL/f ═ 1.64, f1/f26 ═ 1.26, FNO ═ 2.60, (L61-L62)/(2 × L63) ═ 0.35, (r11+ r12)/(r11-r12) ═ 10.30.

TABLE 11

TABLE 12

In fig. 12, S is an astigmatism curve in the sagittal direction, and T is an astigmatism curve in the meridional direction.

Referring to fig. 13, an image capturing module 100 according to an embodiment of the invention includes an optical imaging system 10 and a photosensitive element 20, 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) image sensor or a Charge-coupled Device (CCD).

The image capturing module 100 of the embodiment of the invention includes the optical imaging system 10, and has the advantages of wide viewing angle and small head size through reasonable refractive power configuration and surface type arrangement. On one hand, on the premise of ensuring high imaging quality of the optical imaging system 10, the size of the opening of the screen of the electronic device can be reduced, and further the under-screen packaging of the optical imaging system 10 is facilitated, so that the electronic device can achieve the visual effect of a full screen; on the other hand, in terms of shooting effect, because the optical imaging system 10 has a larger field angle, a wider field of view can be obtained, foreground objects are highlighted, and the shooting experience of the user is met.

Referring to fig. 14, an electronic device 1000 according to an embodiment of the invention includes a housing 200 and an image capturing module 100, wherein 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 imaging-enabled electronic device such as a smart phone (see fig. 14), a car 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, a mobile medical device, and a wearable device.

The optical imaging system 10 in the electronic device 1000 of the above embodiment has the advantages of wide viewing angle and head miniaturization through reasonable refractive power configuration and face-type arrangement. On one hand, on the premise of ensuring high imaging quality of the optical imaging system 10, the size of the opening of the screen of the electronic device can be reduced, so that the under-screen packaging of the optical imaging system 10 is facilitated, and the electronic device 1000 can achieve the visual effect of a full screen; on the other hand, in terms of shooting effect, because the optical imaging system 10 has a larger field angle, a wider field of view can be obtained, foreground objects are highlighted, and the shooting experience of the user is met. The electronic device 1000 not only has better imaging capability, but also can improve the screen occupation ratio.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention 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 embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

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

the optical lens comprises a first lens element with positive refractive power, a second lens element with negative refractive power, and a third lens element with positive refractive power, wherein the object-side surface of the first lens element is convex at the optical axis;

a second lens element with refractive power;

a third lens element with refractive power;

a fourth lens element with positive refractive power having a convex image-side surface along an optical axis;

a fifth lens element with refractive power;

a sixth lens element with refractive power having a convex object-side surface and a concave image-side surface;

the optical imaging system satisfies the following relation:

0.5<f1/f26<1.6；

wherein f26 is a combined focal length of the second, third, fourth, fifth, and sixth lenses, and f1 is an effective focal length of the first lens.

2. The optical imaging system of claim 1, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are aspheric on both an image-side surface and an object-side surface.

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

TTL/Imgh<1.8；

wherein, TTL is a distance on an optical axis from an object-side surface of the first lens element to an image plane of the optical imaging system, and Imgh is half of an image height corresponding to a maximum field angle of the optical imaging system.

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

1.4<TTL/f<2；

wherein, TTL is a distance on an optical axis from an object side surface of the first lens element to an image plane of the optical imaging system, and f is an effective focal length of the optical imaging system.

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

tan(HFOV)>1.05；

wherein the HFOV is half of a maximum field angle of the optical imaging system.

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

FNO<2.8；

wherein FNO is an f-number of the optical imaging system.

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

(L61-L62)/(2*L63)＞0.25

wherein L61 represents the maximum vertical distance from the optical axis of the intersection point of the marginal field of view, which is a light beam incident and converging to the farthest point from the optical axis of the imaging surface of the optical imaging system, and the image side surface of the sixth lens, and L62 represents the minimum vertical distance from the optical axis of the intersection point of the marginal field of view, which is a light beam incident and converging to the image side surface of the optical imaging system; l63 denotes the maximum perpendicular distance from the optical axis of the intersection of the central field of view, which is a light beam incident and converging to the center of the imaging plane of the optical imaging system, and the image side surface of the sixth lens.

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

(r11+r12)/(r11-r12)<15；

wherein r11 is a curvature radius of an object side surface of the sixth lens element at an optical axis, and r12 is a curvature radius of an image side surface of the sixth lens element at the optical axis.

9. The optical imaging system of claim 1, further comprising an optical stop positioned on an object side of the first lens.

10. The optical imaging system of claim 1, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are all made of plastic.

11. An image capturing module, comprising:

the optical imaging system of any one of claims 1 to 10; and

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

12. An electronic device, comprising:

a housing; and

the image capturing module as claimed in claim 11, wherein the image capturing module is mounted on the housing.