CN213690085U

CN213690085U - Optical imaging system, image capturing module and electronic device

Info

Publication number: CN213690085U
Application number: CN202022802839.0U
Authority: CN
Inventors: 华露; 杨健; 李明
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2021-07-13
Anticipated expiration: 2030-11-27

Abstract

The application provides an optical imaging system, an image capturing module and an electronic device. The optical imaging system includes: a first lens element with positive refractive power; a second lens element with refractive power; a third lens element with negative refractive power; a fourth lens element with positive refractive power; the fifth lens element with negative refractive power has an object-side surface and an image-side surface which are both aspheric; the optical imaging system satisfies the following relation: 1.2< | f3/f | < 4.2; wherein f3 is an effective focal length of the third lens, and f is an effective focal length of the optical imaging system. The optical imaging system can further shorten the total length of the optical imaging system and the head caliber of the lens to realize the miniaturization of the lens by reasonably configuring the bending force and the surface type of each lens on the basis of realizing the characteristics of large aperture and high pixel, thereby improving the screen occupation ratio and realizing the effect of comprehensive screen.

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 ten years, the manufacturing technology of electronic products such as smart phones, flat panels, and video cameras has been rapidly developed, and the application thereof has become more and more popular, and the development trend of diversification and diversification is shown, wherein electronic products such as smart phones and flat panels with lenses mounted thereon are also increasingly tending to be light, thin, portable, and miniaturized.

To a certain extent, the thickness of the lens determines the thickness of the whole electronic product, so reducing the thickness of the lens becomes a main way to achieve the lightness and thinness of the electronic product. In the process of implementing the present application, the inventors found that the following problems exist in the prior art: the aperture of the front camera of most current electronic products is large, and the partial area of the whole screen can be occupied, so that the partial area of the display screen is limited, and although the area of the display screen is increased by using a mode of making the camera into a bang form on the market, the camera cannot be carried by the mobile phone and has a comprehensive screen effect.

SUMMERY OF THE UTILITY MODEL

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:

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

a second lens element with refractive power;

a third lens element with negative refractive power;

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

a fifth lens element with negative refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region, wherein the fifth lens element has an aspheric object-side surface and an aspheric image-side surface;

the optical imaging system satisfies the following relation:

1.2<|f3/f|<4.2；

wherein f3 is an effective focal length of the third lens, and f is an effective focal length of the optical imaging system.

The optical imaging system can further shorten the total length of the optical imaging system and the head caliber of the lens to realize the miniaturization of the lens by reasonably configuring the bending force and the surface type of each lens on the basis of realizing the characteristics of large aperture and high pixel, thereby improving the screen occupation ratio and further promoting and realizing the effect of a full screen. In addition, the aberration generated by the third lens can be compressed as much as possible, thereby improving the image quality and reducing the assembly sensitivity.

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

|sag51m-sag51s|/(sd51m-sd51s)>0.2；

the object side surface of the fifth lens element has a first intersection with the optical axis, a tangent plane of each point in the effective diameter of the object side surface of the fifth lens element intersects with a plane perpendicular to the optical axis to form an acute angle, and sag51m is the distance from the point with the largest acute angle to the first intersection in the optical axis direction; a second intersection point is arranged at a quarter of the maximum effective semi-aperture from the first intersection point to the object side surface of the fifth lens, and sag51s is the distance from the first intersection point to the second intersection point in the optical axis direction; sd51m is the half caliber at the point where the acute included angle is the largest; sd51s is the half caliber at the second intersection.

Through with above-mentioned ratio control at reasonable within range, can guarantee that the face type of the object side of fifth lens extends to the object side by the lens center, is favorable to reducing the lens shaping degree of difficulty of fifth lens, still can effectively avoid interior reflection of light line to lead to the formation of image face to produce the ghost image in addition, reduces the possibility that the veiling glare appears, and then promotes the imaging quality by a wide margin. When the value is less than 0.2, the ghost risk increases, affecting the image quality.

1<et3/(et23+et34)<4.2；

the lens module comprises a third lens, a fourth lens, a fifth lens and a sixth lens, wherein et3 is the thickness of the maximum effective semi-aperture of the third lens in the optical axis direction, et23 is the distance from the maximum effective diameter of the image side surface of the second lens to the maximum effective diameter of the object side surface of the third lens in the optical axis direction, and et34 is the distance from the maximum effective diameter of the image side surface of the third lens to the maximum effective diameter of the object side surface of the fourth lens in the optical axis direction.

Through the reasonable control of the ratio, the thickness and the air gap of the three lenses in the middle are favorably and reasonably compressed, and the relative positions of the three lenses in the middle are controlled, so that the total length of the optical imaging system is effectively shortened, and the miniaturization of the optical imaging system is realized. When et3/(et23+ et34) ≥ 4.2, the edge thickness of the third lens is too large and too close to the front and rear lenses, which causes difficulty in lens assembly and increase of possibility of collision and damage between lenses; when et3/(et23+ et34) ≦ 1, it is disadvantageous to shorten the total length of the optical imaging system.

(sd21+sd22)/(sd11+sd12)≥1.05；

wherein sd21 is the maximum effective half aperture of the object-side surface of the second lens, sd22 is the maximum effective half aperture of the image-side surface of the second lens, sd11 is the maximum effective half aperture of the object-side surface of the first lens, and sd12 is the maximum effective half aperture of the image-side surface of the first lens.

By reasonably configuring the ratio, the characteristics of the small head part can be realized on the basis of ensuring a large field angle, a large image plane and miniaturization of the structure. When (sd21+ sd22)/(sd11+ sd12) <1.05, the aperture of the first lens is close to or larger than that of the second lens, which is disadvantageous for the optical imaging system to obtain small head characteristics.

3.5<f5/sag51<20.5；

wherein f5 is the effective focal length of the fifth lens; sag51 is a distance in the optical axis direction from the intersection point of the object-side surface of the fifth lens on the optical axis to the maximum effective semi-aperture of the object-side surface of the fifth lens.

Therefore, the fifth lens element has at least one inflection point, which is beneficial to correcting distortion and curvature of field generated by the front lens element, so that the refractive power configuration close to the imaging surface is more uniform; in addition, when the above formula is satisfied, the refractive power and the rise of the lens in the vertical direction can be reasonably controlled, the excessive thinness and the excessive thickness of the lens can be avoided, the incident angle of light on an imaging surface is reduced, the integral optical sensitivity of the optical imaging system is reduced, and the optical imaging system can obtain higher stability.

1.2<sag4|/et4<3.2；

wherein sag42 is a distance in the optical axis direction from an intersection point of the image-side surface of the fourth lens element on the optical axis to the maximum effective radius position of the image-side surface of the fourth lens element, and et4 is a thickness of the maximum effective semi-aperture of the fourth lens element in the optical axis direction.

So, through with above-mentioned ratio control at reasonable within range, be favorable to balancing the spherical aberration that the preceding lens group produced, promote the holistic power of resolving images of optical imaging system, reduce the optical sensitivity of fourth lens, the change of the rise of the image side face of fourth lens in addition for fourth lens is the U-shaped, and the thick difference of thick limit in keeping provides support for light is incided image plane with less angle from the preceding lens group under the reasonable circumstances.

1.7<TTL/etal<2.7；

wherein TTL is a distance on an optical axis from an object-side surface of the first lens element to an imaging surface of the optical imaging system, and etal is a sum of thicknesses of maximum effective half-apertures of the first lens element to the fifth lens element in the optical axis direction.

Therefore, the ratio is controlled within a reasonable range, so that the total length of the optical imaging system is effectively shortened, the overall length of the optical imaging system can be further compressed, and the lens structure is more compact; by reasonably configuring the size and the refractive power of the lens, the miniaturization, the lightness and the thinness of the optical imaging system can be realized under the condition of meeting the requirements of high pixel and high imaging quality.

Imgh/sd51>4.2；

where Imgh is half the image height corresponding to the maximum field angle of the optical imaging system, and sd51 is the maximum effective half aperture of the object-side surface of the fifth lens element.

Therefore, by controlling the ratio in a reasonable range, on one hand, a large imaging surface can be obtained, high-pixel imaging is realized, and on the other hand, the optical imaging system has small head characteristic competitiveness. When Imgh/sd51 is less than or equal to 4.2, the chip with higher pixels cannot be matched, high-definition imaging cannot be realized, and the user experience is reduced.

1.9<sd51/atl<4

wherein sd51 is a maximum effective half aperture of an object side surface of the fifth lens, and atl is a sum of distances on an optical axis of air gaps between adjacent two of the first to fifth lenses.

Therefore, the optical imaging system is favorably miniaturized by controlling the ratio in a reasonable range. When sd51/atl is larger than or equal to 4, the aperture of the fifth lens is too large, so that the material cost is increased and the stability of the lens is reduced on one hand, and on the other hand, the deflection angle of the edge light on the object side surface of the fifth lens is too large, so that the resolving power is reduced; when sd51/atl is less than or equal to 2, the sum of thicknesses in the air gap is too large, which is not beneficial to reducing the optical total length and realizing the miniaturization of the whole optical imaging system.

BF/et52>1；

and BF is the minimum distance between the image side surface of the fifth lens and the imaging surface of the optical imaging system in the optical axis direction, and et52 is the distance between the maximum effective semi-aperture of the image side surface of the fifth lens and the optical filter on the optical axis.

So, through with above-mentioned ratio control at reasonable within range, can make the back burnt and keep about 0.8mm, can ensure to have good matching nature with the sensitization chip, the image side edge of fifth lens also is favorable to the more reasonable convergence to the image plane of light to the reasonable control of the distance of light filter, helps controlling the aberration and promotes the power of resolving an image, improves the imaging quality. When the BFL/et52 is less than or equal to 1, the configuration of the two parameters is unreasonable, the light deflection angle is easy to be overlarge, the light convergence effect is poor, the correction of aberration is damaged, and the imaging quality is influenced.

The embodiment of the application has still provided a get for instance module, includes:

an optical imaging system; and

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

The optical imaging system in the image capturing module of the embodiment of the application can further shorten the total length of the optical imaging system and the head caliber of the lens to realize the miniaturization of the lens on the basis of realizing the characteristics of large aperture and high pixel by reasonably configuring the bending force and the surface shape of each lens, thereby improving the screen occupation ratio and further promoting and realizing the effect of a full screen. In addition, the aberration generated by the third lens can be compressed as much as possible, thereby improving the image quality and reducing the assembly sensitivity.

An embodiment of the present application 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 of this application embodiment is including getting for instance the module, get for instance the optical imaging system in the module through the power of buckling, the face type of each lens of rational configuration, on the basis of realizing big light ring and high pixel characteristics, can further shorten optical imaging system's overall length and the head bore of camera lens in order to realize the miniaturization of camera lens, improved the screen and occupied the ratio, and then impel and realize the effect of full face screen. In addition, the aberration generated by the third lens can be compressed as much as possible, thereby improving the image quality and reducing the assembly sensitivity.

Drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a fifth lens in an optical imaging system according to a first embodiment of the present application.

Fig. 2 is a schematic structural diagram of first to fifth lenses in an optical imaging system according to a second embodiment of the present application.

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

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

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

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

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

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

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

Fig. 10 is a graph showing spherical aberration, astigmatism and distortion of an optical imaging system according to a fourth embodiment of the present application.

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

Fig. 12 is a graph showing spherical aberration, astigmatism and distortion of an optical imaging system according to a fifth embodiment of the present application.

Fig. 13 is a schematic structural diagram of an optical imaging system according to a sixth embodiment of the present application.

Fig. 14 is a graph showing spherical aberration, astigmatism and distortion of an optical imaging system according to a sixth embodiment of the present application.

Fig. 15 is a schematic structural view of an optical imaging system according to a seventh embodiment of the present application.

Fig. 16 is a graph showing spherical aberration, astigmatism and distortion of an optical imaging system according to a seventh embodiment of the present application.

Fig. 17 is a schematic structural view of an optical imaging system according to an eighth embodiment of the present application.

Fig. 18 is a graph showing spherical aberration, astigmatism and distortion of an optical imaging system according to an eighth embodiment of the present application.

Fig. 19 is a schematic structural view of an optical imaging system according to a ninth embodiment of the present application.

Fig. 20 is a graph showing spherical aberration, astigmatism and distortion of an optical imaging system according to a ninth embodiment of the present application.

Fig. 21 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

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

Infrared filter L6

Stop STO

Object sides S1, S4, S6, S8, S10, S12

Like side faces S2, S5, S7, S9, S11, S13

Image forming surface S14

Photosensitive element 20

Housing 200

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application 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 present application and are not intended to limit the present application. 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 application.

In the description of the present application, 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 are used in the orientations and positional relationships indicated in the drawings for convenience in describing the application and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and thus should not be considered limiting. 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 application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to 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 meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. 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 application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application 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, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Referring to fig. 1 to 3, the optical imaging system 10 of the present embodiment 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 negative refractive power, a fourth lens element L4 with positive refractive power, and a fifth lens element L5 with negative refractive power.

The first lens L1 has an object-side surface S1 and an image-side surface S2; the second lens L2 has an object-side surface S4 and an image-side surface S5; the third lens element L3 has an object-side surface S6 and an image-side surface S7, the fourth lens element L4 has an object-side surface S8 and an image-side surface S9, the object-side surface S8 of the fourth lens element L4 is convex at the paraxial region, and the image-side surface S9 of the fourth lens element L4 is convex at the paraxial region; the fifth lens L5 has an object-side surface S10 and an image-side surface S11.

The optical imaging system 10 satisfies the following relationship:

1.2<|f3/f|<4.2；

where f3 is the effective focal length of the third lens L3, and f is the effective focal length of the optical imaging system 10.

The optical imaging system 10 can further shorten the total length of the optical imaging system 10 and the head caliber of the lens to realize the miniaturization of the lens by reasonably configuring the bending force and the surface shape of each lens on the basis of realizing the characteristics of large aperture and high pixel, thereby improving the screen occupation ratio and further promoting and realizing the effect of a full screen. In addition, the aberration generated by the third lens element L3 can be compressed as much as possible, thereby improving the image quality and reducing the assembly sensitivity.

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 fifth lens L5, 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 on the object-side surface S2 of the first lens L1.

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

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

|sag51m-sag51s|/(sd51m-sd51s)>0.2；

in fig. 1, the object-side surface S10 of the fifth lens L5 has a first intersection point a with the optical axis, the object-side surface S10 of the fifth lens L5 is a curved surface, theoretically, the object-side surface S10 of the fifth lens L5 has innumerable mutually non-parallel tangent surfaces, the tangent surfaces L of the points in the effective diameter of the object-side surface S10 of the fifth lens L5 intersect with the plane perpendicular to the optical axis to form an acute angle, the point with the largest acute angle is B, and the sag51m is the distance from the point B with the largest acute angle to the first intersection point a in the optical axis direction; a second intersection point C is located at a quarter of the maximum effective radius from the object-side surface S10 of the first intersection point a to the fifth lens L5, and sag51S is a distance from the first intersection point a to the second intersection point C in the optical axis direction; sd51m is the half aperture at the point B where the acute included angle is the largest; sd51s is the half bore at the second intersection point C.

Through with above-mentioned ratio control at reasonable within range, can guarantee that the face type of the object side S10 of fifth lens L5 extends to the object side by the lens center, be favorable to reducing the lens shaping degree of difficulty of fifth lens L5, still can effectively avoid in addition interior reflection of light line to lead to image surface S14 to produce the ghost image, reduce the possibility that the parasitic light appears, and then promote imaging quality by a wide margin. When the value is less than 0.2, the ghost risk increases, affecting the image quality.

1<et3/(et23+et34)<4.2；

as shown in fig. 2, et1 is a thickness of the maximum effective half aperture of the first lens L1 in the optical axis direction, et2 is a thickness of the maximum effective half aperture of the second lens L2 in the optical axis direction, et3 is a thickness of the maximum effective half aperture of the third lens L3 in the optical axis direction, et4 is a thickness of the maximum effective half aperture of the fourth lens L4 in the optical axis direction, et5 is a thickness of the maximum effective half aperture of the fifth lens L5 in the optical axis direction, et23 is a distance from the maximum effective aperture of the image-side surface S5 of the second lens L2 to the maximum effective aperture of the object-side surface S6 of the third lens L3 in the optical axis direction, et34 is a distance from the maximum effective aperture of the image-side surface S7 of the third lens L3 to the maximum effective aperture of the object-side surface S8 of the fourth lens L4 in the optical axis direction, et2 is a distance between the maximum effective aperture of the image-side surface S7 of the fifth lens L5956 and the optical axis filter 6, et is the sum of the thicknesses of the maximum effective half apertures of the first lens L1 to the fifth lens L5 in the optical axis direction, i.e., the sum of et1, et2, et3, et4, and et 5. The lens comprises an effective diameter and a non-effective diameter, and light rays incident from the outside can pass through the effective diameter of the lens and finally reach the photosensitive element; the non-effective diameter is mainly used for bearing in the lens cone.

Through the reasonable control of the ratio, the thickness and the air gap of the three lenses in the middle are favorably and reasonably compressed, and the relative positions of the three lenses in the middle are controlled, so that the total length of the optical imaging system 10 is effectively shortened, and the miniaturization of the optical imaging system 10 is realized. When et3/(et23+ et34) ≥ 4.2, the edge thickness of the third lens L3 is too large and too close to the front and rear lenses, which causes difficulty in lens assembly and increase of possibility of collision and damage between lenses; when et3/(et23+ et34) ≦ 1, it is not favorable to shorten the total length of the optical imaging system 10.

(sd21+sd22)/(sd11+sd12)≥1.05；

wherein sd21 is the maximum effective half-aperture of the object-side surface S4 of the second lens L2, sd22 is the maximum effective half-aperture of the image-side surface S5 of the second lens L2, sd11 is the maximum effective half-aperture of the object-side surface S1 of the first lens L1, and sd12 is the maximum effective half-aperture of the image-side surface S2 of the first lens L1.

By reasonably configuring the ratio, the characteristics of the small head part can be realized on the basis of ensuring a large field angle, a large image plane and miniaturization of the structure. When (sd21+ sd22)/(sd11+ sd12) <1.05, the aperture of the first lens L1 is close to or larger than that of the second lens L2, which is not favorable for the optical imaging system 10 to obtain small head characteristics.

3.5<f5/sag51<20.5；

wherein f5 is the effective focal length of the fifth lens L5; sag51 is the distance in the optical axis direction from the intersection point of the object-side surface S10 of the fifth lens L5 on the optical axis to the maximum effective half aperture of the object-side surface S10 of the fifth lens L5.

Thus, the fifth lens element L5 has at least one inflection point, which is favorable for correcting the distortion and curvature of field generated by the front lens element, so that the refractive power distribution near the image plane S14 is more uniform; in addition, when the above formula is satisfied, the refractive power and the rise of the lens in the vertical direction can be reasonably controlled, the excessive thinness and the excessive thickness of the lens can be avoided, the incident angle of the light on the imaging surface S14 is reduced, the overall optical sensitivity of the optical imaging system 10 is reduced, and the optical imaging system can obtain higher stability.

1.2<sag4/et4<3.2；

here, sag42 is the distance in the optical axis direction from the intersection point of the optical axis of the image-side surface S9 of the fourth lens L4 to the maximum effective radius position of the image-side surface S9 of the fourth lens L4, and et4 is the thickness of the maximum effective half aperture of the fourth lens L4 in the optical axis direction.

Therefore, the ratio is controlled within a reasonable range, the spherical aberration generated by the front lens group is balanced, the overall resolving power of the optical imaging system 10 is improved, the optical sensitivity of the fourth lens L4 is reduced, and in addition, the rise of the image side surface S9 of the fourth lens L4 is changed, so that the fourth lens L4 is U-shaped, and support is provided for the light to enter the image plane from the front lens group at a smaller angle under the condition of keeping the medium thick edge thickness difference reasonable.

1.7<TTL/etal<2.7；

wherein, TTL is the distance on the optical axis from the object-side surface S1 of the first lens element L1 to the image plane S14 of the optical imaging system 10, and etal is the total thickness of the maximum effective half-apertures of the first lens element L1 to the fifth lens element L5 in the optical axis direction.

Therefore, the ratio is controlled within a reasonable range, which is beneficial to effectively shortening the total length of the optical imaging system 10, so that the overall length of the optical imaging system 10 can be compressed, and the lens structure is more compact; by reasonably configuring the lens size and the refractive power, the optical imaging system 10 can be miniaturized and thinned while satisfying high pixel and high imaging quality.

Imgh/sd51>4.2；

where Imgh is half the image height corresponding to the maximum field angle of the optical imaging system 10, and sd51 is the maximum effective half-diameter of the object-side surface S10 of the fifth lens L5.

Thus, by controlling the ratio in a reasonable range, on one hand, a large imaging surface S14 can be obtained, high pixel imaging can be achieved, and on the other hand, the optical imaging system 10 can have small head characteristic competitiveness. When Imgh/sd51 is less than or equal to 4.2, the chip with higher pixels cannot be matched, high-definition imaging cannot be realized, and the user experience is reduced.

1.9<sd51/atl<4；

where sd51 is the maximum effective half aperture of the object-side surface S10 of the fifth lens L5, and atl is the sum of the distances on the optical axis of the air gaps between adjacent two of the first lens L1 to the fifth lens L5.

Thus, by controlling the above ratio within a reasonable range, miniaturization of the optical imaging system 10 is facilitated. When sd51/atl is larger than or equal to 4, the aperture of the fifth lens L5 is too large, so that on one hand, the material cost is increased, the stability of the lens is reduced, and on the other hand, the deflection angle of the edge light on the object side surface S10 of the fifth lens L5 is too large, so that the resolving power is reduced; when sd51/atl is less than or equal to 2, the sum of thicknesses in the air gap is too large, which is not favorable for reducing the total optical length and realizing the miniaturization of the whole optical imaging system 10.

BF/et52>1；

where BF is the minimum distance in the optical axis direction from the image side surface S11 of the fifth lens L5 to the imaging surface S14 of the optical imaging system 10, and et52 is the distance in the optical axis direction of the air gap between the maximum effective half aperture of the image side surface S11 of the fifth lens L5 and the filter L6.

So, through with above-mentioned ratio control at reasonable within range, can make the back burnt keep about 0.8mm, can ensure to have good matching nature with the sensitization chip, the reasonable control of the distance of image side S11 edge to light filter L6 of fifth lens L5 also is favorable to the more reasonable convergence to image plane S14 of light, helps controlling the aberration and promotes the resolving power, improves the formation of image quality. When the BFL/et52 is less than or equal to 1, the configuration of the two parameters is unreasonable, the light deflection angle is easy to be overlarge, the light convergence effect is poor, the correction of aberration is damaged, and the imaging quality is influenced.

First embodiment

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

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

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

The reference wavelength of the focal length in the first embodiment is 555nm, and the reference wavelengths of the refractive index and the abbe number are 587.56nm, and the optical imaging system 10 in the first embodiment satisfies the conditions of the following table.

TABLE 1

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

TABLE 2

Number of noodles	K	A4	A6	A8	A10	A12	A14	A16	A18	A20
											1	-13.2044	0.5111	-1.0215	1.1705	4.0952	-22.9912	41.7697	-27.8568	0.0000	0.0000
2	-42.7009	0.0330	-0.2542	0.7585	-5.4087	16.6344	-25.3588	12.8844	0.0000	0.0000
											4	-99.0000	-0.0890	-0.2623	0.2145	-2.1569	4.4323	-5.1165	0.0000	0.0000	0.0000
5	99.0000	-0.2502	0.4970	-4.1071	14.7893	-39.4709	59.3161	-35.1619	0.0000	0.0000
											6	3.7053	-0.6914	2.0256	-15.6795	79.6490	-258.3099	487.3575	-475.1910	183.9394	0.0000
7	-58.1689	-0.5475	1.4358	-5.4528	15.4462	-29.1399	33.8126	-21.0037	5.0520	0.1962
											8	21.4897	-0.1770	0.6883	-3.0042	8.8036	-16.6310	19.7904	-14.3338	5.8591	-1.0606
9	-4.2987	-0.5507	1.2400	-2.2223	2.4938	-1.4521	0.2961	0.0582	-0.0145	-0.0049
											10	-45.1416	-0.2257	0.2165	-0.3243	0.3797	-0.2708	0.1149	-0.0284	0.0038	-0.0002
11	-4.8847	-0.1325	0.0799	-0.0421	0.0172	-0.0050	0.0009	-0.0001	0.0000	0.0000

It should be noted that the surfaces of the lenses of the optical imaging system 10 may be aspheric, and for these aspheric surfaces, the aspheric equation of the aspheric surface is:

where Z denotes a height in parallel with the Z axis in the lens surface, r denotes a radial distance from the vertex, c denotes a curvature of the surface at the vertex, k denotes a conic constant, and a4, a6, A8, a10, and a12 respectively denote aspheric coefficients of 4 th order, 6 th order, 8 th order, 10 th order, and 12 th order. In the embodiment of the present application, the object-side surface and the image-side surface of each of the first lens element to the fifth lens element are aspheric, and the conic constant k and the aspheric coefficient corresponding to the aspheric surface are shown in table 2.

Fig. 4 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical imaging system 10 according to the embodiment of the present application, where the longitudinal spherical aberration curves indicate that after light with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm pass through each lens of the optical imaging system 10, the values of the convergent focus deviation are all less than 0.05mm, which indicates that the imaging quality of the embodiment of the present application is better; the reference wavelength of astigmatism and distortion is 555nm, and the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature, wherein the maximum values of the arc loss field curvature and the meridional field curvature are both less than 0.05mm, so that better compensation is obtained; the distortion curve represents the distortion magnitude values corresponding to different field angles, wherein the maximum distortion is less than 50%, and the distortion is well corrected.

Second embodiment

Referring to fig. 5, the optical imaging system 20 of the second embodiment includes, in order from an object side to an image side, a first lens element L1 with positive refractive power, a stop STO, a second lens element L2 with positive refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, and an infrared filter L6.

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

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

The reference wavelength of the focal length in the second embodiment is 555nm, and the reference wavelengths of the refractive index and the abbe number are 587.56nm, and the optical imaging system 10 in the second embodiment satisfies the conditions of the following table.

TABLE 3

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

TABLE 4

K	A4	A6	A8	A10	A12	A14	A16	A18	A20
										-15.0020	0.5011	-1.0641	1.0664	4.0364	-22.7357	42.2896	-29.6127	0.0000	0.0000
-29.2809	0.0348	-0.2835	0.7196	-5.5552	15.9679	-26.4050	21.2575	0.0000	0.0000
										52.4502	-0.0293	-0.2972	0.2391	-1.9285	4.5116	-4.7556	0.0000	0.0000	0.0000
-99.0000	-0.2128	0.5314	-4.0278	14.9991	-39.2236	59.3085	-35.6657	0.0000	0.0000
										-58.0801	-0.6765	2.0733	-15.6392	79.6393	-258.3356	487.4080	-475.0222	183.6179	0.0000
-2.4830	-0.5370	1.4170	-5.4490	15.4594	-29.1343	33.8017	-21.0278	5.0315	0.2118
										19.4085	-0.1747	0.7409	-2.9862	8.7864	-16.6571	19.7715	-14.3398	5.8661	-1.0424
-4.3495	-0.5455	1.2321	-2.2282	2.4923	-1.4518	0.2966	0.0585	-0.0144	-0.0048
										-39.8430	-0.2260	0.2163	-0.3243	0.3797	-0.2708	0.1149	-0.0284	0.0038	-0.0002
-4.5913	-0.1340	0.0801	-0.0422	0.0172	-0.0050	0.0009	-0.0001	0.0000	0.0000

Fig. 6 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical imaging system 10 according to the embodiment of the present application, where the longitudinal spherical aberration curves indicate that after light with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm pass through each lens of the optical imaging system 10, the values of the convergent focus deviation are all less than 0.05mm, which indicates that the imaging quality of the embodiment of the present application is better; the reference wavelength of astigmatism and distortion is 555nm, and the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature, wherein the maximum values of the arc loss field curvature and the meridional field curvature are both less than 0.05mm, so that better compensation is obtained; the distortion curve represents the distortion magnitude values corresponding to different field angles, wherein the maximum distortion is less than 50%, and the distortion is well corrected.

Third embodiment

Referring to fig. 7, the optical imaging system 30 of the third embodiment includes, in order from an object side to an image side, a first lens element L1 with positive refractive power, a stop STO, a second lens element L2 with positive refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, and an infrared filter L6.

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

The reference wavelength of the focal length in the third embodiment is 555nm, the reference wavelengths of the refractive index and the abbe number are 587.56nm, and the optical imaging system 10 in the third embodiment satisfies the conditions of the following table.

TABLE 5

TABLE 6

Number of noodles	K	A4	A6	A8	A10	A12	A14	A16	A18	A20
											1	-9.1855	0.5959	-1.0298	0.9925	4.0619	-22.2910	43.0686	-31.8955	0.0000	0.0000
2	-17.3798	0.0467	-0.2733	0.9739	-5.0787	15.8063	-30.2790	25.3633	0.0000	0.0000
											4	-40.0244	-0.1419	-0.0030	0.1158	-1.7332	8.8867	-9.1018	0.0000	0.0000	0.0000
5	99.0000	-0.2442	0.5816	-3.7570	15.7566	-38.9208	57.3574	-35.5530	0.0000	0.0000
											6	-99.0000	-0.6009	2.0040	-15.4598	79.7787	-258.7303	486.2993	-476.2981	184.2815	0.0000
7	7.0336	-0.5416	1.4526	-5.4858	15.4283	-29.1366	33.8222	-21.0031	5.0369	0.1685
											8	4.8486	-0.1394	0.7002	-2.9779	8.8260	-16.6416	19.7641	-14.3522	5.8596	-1.0405
9	-5.2699	-0.5470	1.2546	-2.2248	2.4883	-1.4548	0.2955	0.0583	-0.0142	-0.0047
											10	-33.3619	-0.2249	0.2171	-0.3243	0.3797	-0.2708	0.1149	-0.0284	0.0038	-0.0002
11	-4.6491	-0.1394	0.0812	-0.0424	0.0171	-0.0050	0.0009	-0.0001	0.0000	0.0000

Fig. 8 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical imaging system 10 according to the embodiment of the present application, where the longitudinal spherical aberration curves indicate that after light with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm pass through each lens of the optical imaging system 10, the values of the convergent focus deviation are all less than 0.05mm, which indicates that the imaging quality of the embodiment of the present application is better; the reference wavelength of astigmatism and distortion is 555nm, and the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature, wherein the maximum values of the arc loss field curvature and the meridional field curvature are both less than 0.05mm, so that better compensation is obtained; the distortion curve represents the distortion magnitude values corresponding to different field angles, wherein the maximum distortion is less than 50%, and the distortion is well corrected.

Fourth embodiment

Referring to fig. 9, the optical imaging system 40 of the fourth embodiment includes, in order from an object side to an image side, a first lens element L1 with positive refractive power, a stop STO, a second lens element L2 with positive refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, and an infrared filter L6.

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

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

The reference wavelength of the focal length in the fourth embodiment is 555nm, the reference wavelengths of the refractive index and the abbe number are 587.56nm, and the optical imaging system 10 in the fourth embodiment satisfies the conditions of the following table.

TABLE 7

TABLE 8

Number of noodles	K	A4	A6	A8	A10	A12	A14	A16	A18	A20
											1	-11.5320	0.5570	-0.9956	1.1429	4.0988	-22.7728	42.1383	-28.8823	0.0000	0.0000
2	-19.5007	0.0509	-0.2370	0.7683	-5.3733	16.7998	-25.5481	8.4590	0.0000	0.0000
											4	73.8717	-0.1203	-0.3132	0.1586	-2.0557	4.7081	-7.9522	0.0000	0.0000	0.0000
5	41.4003	-0.2647	0.4728	-4.0858	14.8218	-39.4467	59.3749	-34.7311	0.0000	0.0000
											6	10.9773	-0.6913	2.0712	-15.7000	79.6084	-258.2984	487.4863	-475.0561	183.5828	0.0000
7	-99.0000	-0.5712	1.4304	-5.4676	15.4329	-29.1458	33.8124	-21.0016	5.0550	0.2001
											8	11.4397	-0.1597	0.6283	-3.0246	8.8273	-16.6122	19.7944	-14.3372	5.8565	-1.0571
9	-5.2968	-0.6046	1.2540	-2.2064	2.5015	-1.4489	0.2973	0.0582	-0.0152	-0.0060
											10	-19.5937	-0.2320	0.2173	-0.3240	0.3798	-0.2708	0.1149	-0.0284	0.0038	-0.0002
11	-4.0155	-0.1361	0.0808	-0.0421	0.0172	-0.0050	0.0009	-0.0001	0.0000	0.0000

Fig. 10 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical imaging system 10 according to the embodiment of the present application, where the longitudinal spherical aberration curves indicate that after light with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm pass through each lens of the optical imaging system 10, the values of the convergent focus deviation are all less than 0.05mm, which indicates that the imaging quality of the embodiment of the present application is better; the reference wavelength of astigmatism and distortion is 555nm, and the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature, wherein the maximum values of the arc loss field curvature and the meridional field curvature are both less than 0.05mm, so that better compensation is obtained; the distortion curve represents the distortion magnitude values corresponding to different field angles, wherein the maximum distortion is less than 50%, and the distortion is well corrected.

Fifth embodiment

Referring to fig. 11, the optical imaging system 50 of the fifth embodiment includes, in order from an object side to an image side, a first lens element L1 with positive refractive power, a stop STO, a second lens element L2 with positive refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, and an infrared filter L6.

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

The reference wavelength of the focal length is 555nm, the reference wavelengths of the refractive index and the abbe number are 587.56nm in the fifth embodiment, and the optical imaging system 10 in the fifth embodiment satisfies the conditions of the following table.

TABLE 9

Watch 10

Number of noodles	K	A4	A6	A8	A10	A12	A14	A16	A18	A20
											1	-10.7094	0.6162	-0.9541	1.1364	4.1799	-22.3164	42.8003	-31.5773	0.0000	0.0000
2	-4.5150	0.0723	-0.1632	1.1020	-5.4604	14.5951	-29.7071	25.4581	0.0000	0.0000
											4	99.0000	-0.0881	-0.2412	-0.0324	-1.7242	7.6033	-18.9658	0.0000	0.0000	0.0000
5	27.3901	-0.2885	0.5256	-3.9994	14.8319	-39.6051	59.1477	-34.4510	0.0000	0.0000
											6	38.7588	-0.7139	2.0447	-15.7086	79.6299	-258.2351	487.6041	-474.8592	183.8424	0.0000
7	39.2826	-0.5549	1.4223	-5.4718	15.4311	-29.1482	33.8089	-21.0049	5.0537	0.2019
											8	12.1272	-0.1530	0.6807	-3.0043	8.8057	-16.6391	19.7778	-14.3422	5.8600	-1.0490
9	-4.1121	-0.5676	1.2415	-2.2178	2.4968	-1.4505	0.2968	0.0583	-0.0147	-0.0052
											10	-61.9769	-0.2347	0.2180	-0.3238	0.3798	-0.2708	0.1149	-0.0284	0.0038	-0.0002
11	-4.6816	-0.1333	0.0802	-0.0421	0.0172	-0.0050	0.0009	-0.0001	0.0000	0.0000

Fig. 12 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical imaging system 10 according to the embodiment of the present application, where the longitudinal spherical aberration curves indicate that after light with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm pass through each lens of the optical imaging system 10, the values of the convergent focus deviation are all less than 0.05mm, which indicates that the imaging quality of the embodiment of the present application is better; the reference wavelength of astigmatism and distortion is 555nm, and the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature, wherein the maximum values of the arc loss field curvature and the meridional field curvature are both less than 0.05mm, so that better compensation is obtained; the distortion curve represents the distortion magnitude values corresponding to different field angles, wherein the maximum distortion is less than 50%, and the distortion is well corrected.

Sixth embodiment

Referring to fig. 13, the optical imaging system 60 of the sixth embodiment includes, in order from an object side to an image side, a first lens element L1 with positive refractive power, a stop STO, a second lens element L2 with positive refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, and an infrared filter L6.

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

The reference wavelength of the focal length in the sixth embodiment is 555nm, the reference wavelengths of the refractive index and the abbe number are 587.56nm, and the optical imaging system 10 in the sixth embodiment satisfies the conditions of the following table.

TABLE 11

TABLE 12

Number of noodles	K	A4	A6	A8	A10	A12	A14	A16	A18	A20
											1	-8.7714	0.6236	-0.9652	1.1315	4.1815	-22.5115	42.3113	-30.1412	0.0000	0.0000
2	-7.5301	0.0760	-0.1449	0.9884	-5.4671	15.7338	-27.0735	17.9805	0.0000	0.0000
											4	-99.0000	-0.1063	-0.1210	-0.0125	-2.5416	5.2909	-5.3712	0.0000	0.0000	0.0000
5	23.0208	-0.2457	0.5513	-4.1000	14.8176	-39.0744	59.9131	-35.9071	0.0000	0.0000
											6	-1.8233	-0.6767	2.0508	-16.0820	79.5852	-257.2200	489.4774	-475.0340	172.6777	0.0000
7	0.0000	-0.5097	1.4119	-5.4267	15.4556	-29.1482	33.8034	-21.0034	5.0588	0.1867
											8	8.0525	-0.2348	0.7058	-2.9876	8.8528	-16.6039	19.7854	-14.3549	5.8413	-1.0586
9	-4.6897	-0.5756	1.2440	-2.2157	2.4957	-1.4520	0.2960	0.0581	-0.0147	-0.0052
											10	-98.5546	-0.2313	0.2188	-0.3239	0.3798	-0.2708	0.1149	-0.0284	0.0038	-0.0002
11	-5.0526	-0.1358	0.0807	-0.0421	0.0172	-0.0050	0.0009	-0.0001	0.0000	0.0000

Fig. 14 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical imaging system 10 according to the embodiment of the present application, where the longitudinal spherical aberration curves indicate that after light with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm pass through each lens of the optical imaging system 10, the values of the convergent focus deviation are all less than 0.05mm, which indicates that the imaging quality of the embodiment of the present application is better; the reference wavelength of astigmatism and distortion is 555nm, and the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature, wherein the maximum values of the arc loss field curvature and the meridional field curvature are both less than 0.05mm, so that better compensation is obtained; the distortion curve represents the distortion magnitude values corresponding to different field angles, wherein the maximum distortion is less than 50%, and the distortion is well corrected.

Seventh embodiment

Referring to fig. 15, the optical imaging system 60 of the seventh embodiment includes, in order from an object side to an image side, a first lens element L1 with positive refractive power, a stop STO, a second lens element L2 with positive refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, and an infrared filter L6.

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

The reference wavelength of the focal length in the seventh embodiment is 555nm, the reference wavelengths of the refractive index and the abbe number are 587.56nm, and the optical imaging system 10 in the sixth embodiment satisfies the conditions of the following table.

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TABLE 14

Number of noodles	K	A4	A6	A8	A10	A12	A14	A16	A18	A20
											1	-11.9735	0.5916	-0.9965	1.0811	4.1622	-22.3229	42.6235	-31.8943	0.0000	0.0000
2	-12.7374	0.0662	-0.1645	0.9834	-5.4774	15.5150	-27.3195	18.9121	0.0000	0.0000
											4	99.0000	-0.1282	-0.2686	-0.0121	-2.4031	4.8134	-7.1537	0.0000	0.0000	0.0000
5	26.6220	-0.2434	0.4104	-4.1079	14.8635	-39.4714	59.1475	-34.2270	0.0000	0.0000
											6	-9.2775	-0.6630	2.0763	-15.6407	79.6838	-258.2601	487.4688	-475.0229	183.8407	0.0000
7	99.0000	-0.5529	1.4482	-5.4564	15.4478	-29.1284	33.8270	-20.9971	5.0426	0.1656
											8	10.3654	-0.1785	0.6382	-2.9878	8.8594	-16.6013	19.7875	-14.3512	5.8450	-1.0592
9	-5.6065	-0.5953	1.2562	-2.2075	2.4995	-1.4502	0.2968	0.0584	-0.0148	-0.0056
											10	-19.6016	-0.2364	0.2173	-0.3240	0.3798	-0.2708	0.1149	-0.0284	0.0038	-0.0002
11	-4.1814	-0.1363	0.0810	-0.0421	0.0172	-0.0050	0.0009	-0.0001	0.0000	0.0000

Fig. 16 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical imaging system 10 according to the embodiment of the present application, where the longitudinal spherical aberration curves indicate that after light with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm pass through each lens of the optical imaging system 10, the values of the convergent focus deviation are all less than 0.05mm, which indicates that the imaging quality of the embodiment of the present application is better; the reference wavelength of astigmatism and distortion is 555nm, and the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature, wherein the maximum values of the arc loss field curvature and the meridional field curvature are both less than 0.05mm, so that better compensation is obtained; the distortion curve represents the distortion magnitude values corresponding to different field angles, wherein the maximum distortion is less than 50%, and the distortion is well corrected.

Eighth embodiment

Referring to fig. 17, the optical imaging system 60 of the eighth embodiment includes, in order from an object side to an image side, a first lens element L1 with positive refractive power, a stop STO, a second lens element L2 with positive refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, and an infrared filter L6.

The reference wavelength of the focal length is 555nm in the eighth embodiment, the reference wavelengths of the refractive index and the abbe number are 587.56nm, and the optical imaging system 10 in the eighth embodiment satisfies the conditions of the following table.

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TABLE 16

Fig. 18 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical imaging system 10 according to the embodiment of the present application, where the longitudinal spherical aberration curves indicate that after light with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm pass through each lens of the optical imaging system 10, the values of the convergent focus deviation are all less than 0.05mm, which indicates that the imaging quality of the embodiment of the present application is better; the reference wavelength of astigmatism and distortion is 555nm, and the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature, wherein the maximum values of the arc loss field curvature and the meridional field curvature are both less than 0.05mm, so that better compensation is obtained; the distortion curve represents the distortion magnitude values corresponding to different field angles, wherein the maximum distortion is less than 50%, and the distortion is well corrected.

Ninth embodiment

Referring to fig. 19, the optical imaging system 60 of the ninth embodiment includes, in order from an object side to an image side, a first lens element L1 with positive refractive power, a stop STO, a second lens element L2 with positive refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, and an infrared filter L6.

The reference wavelength of the focal length in the ninth embodiment is 555nm, the reference wavelengths of the refractive index and the abbe number are 587.56nm, and the optical imaging system 10 in the ninth embodiment satisfies the conditions of the following table.

TABLE 17

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Number of noodles	K	A4	A6	A8	A10	A12	A14	A16	A18	A20
											1	-13.6204	0.5420	-1.0495	0.9826	3.9506	-22.5513	42.6935	-32.4178	0.0000	0.0000
2	-27.9747	0.0398	-0.2575	0.7441	-5.6461	15.6277	-26.9671	20.2891	0.0000	0.0000
											4	-99.0000	-0.0506	-0.2398	0.1786	-2.3171	4.4275	-1.7863	0.0000	0.0000	0.0000
5	4.3984	-0.2108	0.4716	-4.0521	15.0931	-38.9740	59.5716	-35.9347	0.0000	0.0000
											6	-58.3008	-0.6826	2.0189	-15.6020	79.7991	-258.1325	487.4636	-475.4093	182.7323	0.0000
7	-3.3899	-0.5537	1.4353	-5.4444	15.4539	-29.1380	33.8082	-21.0118	5.0441	0.1948
											8	21.3750	-0.1878	0.7160	-2.9956	8.7963	-16.6419	19.7823	-14.3365	5.8630	-1.0493
9	-4.6499	-0.5424	1.2379	-2.2240	2.4935	-1.4519	0.2962	0.0583	-0.0144	-0.0048
											10	-17.9411	-0.2271	0.2160	-0.3243	0.3797	-0.2708	0.1149	-0.0284	0.0038	-0.0002
11	-4.3318	-0.1345	0.0805	-0.0422	0.0172	-0.0050	0.0009	-0.0001	0.0000	0.0000

Fig. 20 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical imaging system 10 according to the embodiment of the present application, where the longitudinal spherical aberration curves indicate that after light with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm pass through each lens of the optical imaging system 10, the values of the convergent focus deviation are all less than 0.05mm, which indicates that the imaging quality of the embodiment of the present application is better; the reference wavelength of astigmatism and distortion is 555nm, and the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature, wherein the maximum values of the arc loss field curvature and the meridional field curvature are both less than 0.05mm, so that better compensation is obtained; the distortion curve represents the distortion magnitude values corresponding to different field angles, wherein the maximum distortion is less than 50%, and the distortion is well corrected.

Table 19

Referring to fig. 21, the image capturing module 100 of the present embodiment 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).

Referring to fig. 21, the electronic device 1000 according to the embodiment of the present disclosure 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 disclosure includes, but is not limited to, imaging-enabled electronic devices such as smart phones, car lenses, monitoring lenses, tablet computers, notebook computers, electronic book readers, Portable Multimedia Players (PMPs), portable phones, video phones, digital still cameras, mobile medical devices, and wearable devices.

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

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application and not for limiting, and although the present application 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 can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.

Claims

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

a second lens element with refractive power;

a third lens element with negative refractive power;

the optical imaging system satisfies the following relation:

1.2<|f3/f|<4.2；

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

|sag51m-sag51s|/(sd51m-sd51s)>0.2；

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

1<et3/(et23+et34)<4.2；

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

(sd21+sd22)/(sd11+sd12)≥1.05；

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

3.5<f5/sag51<20.5；

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

1.2<sag42/et4<3.2；

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

1.7<TTL/etal<2.7；

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

Imgh/sd51>4.2；

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

1.9<sd51/atl<4；

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

BF/et52>1；

11. An image capturing module, comprising:

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

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.