WO2020134026A1 - Optical imaging system - Google Patents

Abstract

An optical imaging system, comprising, in sequence from an object side to an image side along an optical axis, a first lens (E1), a second lens (E2), a third lens (E3), a fourth lens (E4), and a fifth lens (E5). The first lens (E1) has positive focal power and a convex object side surface (S1); the second lens (E2) has negative focal power; the third lens (E3) has negative focal power and a concave object side surface (S6); the fourth lens (E4) has positive focal power or negative focal power; the fifth lens (E5) has negative focal power and a concave object side surface (S9). A distance TTL on an optical axis from the object side surface (S1) of the first lens (E1) to an imaging surface (S13) of the optical imaging system, a total effective focal length f of the optical imaging system, and half of a diagonal length, i.e., ImgH, of an effective pixel region on the imaging surface (S13) of the optical imaging system satisfy TTL/f≤0.95 and f/ImgH<4.5.

Description

Optical imaging system

Cross-reference of related applications

This application requires the priority and rights of the Chinese patent application with the patent application number 201811600411.9 filed on December 26, 2018 at the China National Intellectual Property Administration (CNIPA). This Chinese patent application is incorporated herein by reference in its entirety.

Technical field

The present application relates to an optical imaging system, and more particularly, to an optical imaging system including five lenses.

Background technique

In recent years, with the continuous upgrading of electronic products such as smart phones and tablets, the optical imaging system applied to it faces the challenges of high pixels, low cost, and ultrathinness. However, for most low-end models, for cost control considerations, the five-piece lens system is still an important choice.

The major smart terminal manufacturers are increasingly pursuing high-resolution and thin and light lenses, and the large working image area and the total length of short systems have become the main factors of concern for major smart terminal manufacturers. The large working image surface means that higher image resolution may be provided, and the short overall system length means that the lens can be thinner and lighter. The realization of a large working image surface and a short total length of the system while greatly reducing the cost greatly increases the design difficulty of the optical system.

Summary of the invention

The present application provides an optical imaging system applicable to portable electronic products, which can at least solve or partially solve the above-mentioned at least one disadvantage in the prior art.

On the one hand, the present application provides an optical imaging system that includes, in order from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. Among them, the first lens can have positive power and its object side can be convex; the second lens can have negative power; the third lens can have negative power and its image side can be concave; the fourth lens has positive light Power or negative power; the fifth lens may have negative power, and its object side may be concave.

In one embodiment, the distance TTL on the optical axis from the object side of the first lens to the imaging surface of the optical imaging system and the total effective focal length f of the optical imaging system can satisfy TTL/f<1. Optionally, the distance TTL on the optical axis between the object side of the first lens and the imaging surface of the optical imaging system and the total effective focal length f of the optical imaging system may satisfy TTL/f≤0.95.

In one embodiment, the total effective focal length f of the optical imaging system and half the diagonal length of the effective pixel area on the imaging surface of the optical imaging system, ImgH, can satisfy f/ImgH>4.5.

In one embodiment, the curvature radius R9 of the object side of the fifth lens and the effective focal length f5 of the fifth lens may satisfy 0<R9/f5<1.

In one embodiment, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens may satisfy 0<f2/f3<1.

In one embodiment, the radius of curvature R1 of the object side of the first lens and the radius of curvature R6 of the image side of the third lens may satisfy 0<R1/R6<1.4.

In one embodiment, the center thickness of the first lens on the optical axis CT1, the center thickness of the second lens on the optical axis CT2, and the effective focal length f1 of the first lens can satisfy 0<(CT1+CT2)/f1<0.7 .

In one embodiment, the dispersion coefficient V2 of the second lens, the dispersion coefficient V3 of the third lens, and the dispersion coefficient V4 of the fourth lens may satisfy 30<(V2+V3+V4)/3<40.

In one embodiment, the separation distance T12 between the first lens and the second lens on the optical axis and the separation distance T45 between the fourth lens and the fifth lens on the optical axis may satisfy 0<T12*T45<0.2 mm ² .

In one embodiment, the center thickness of the third lens on the optical axis CT3, the center thickness of the fourth lens on the optical axis CT4 and the center thickness of the fifth lens on the optical axis CT5 can satisfy 0<CT5/(CT3+ CT4)<0.5.

In one embodiment, the sum of the distance TTL on the optical axis from the object side of the first lens to the imaging plane of the optical imaging system and the separation distance on the optical axis of any two adjacent lenses from the first lens to the fifth lens ∑ AT can satisfy 4<TTL/∑AT<5.

In one embodiment, the maximum effective radius DT11 of the object side of the first lens and the maximum effective radius DT51 of the object side of the fifth lens may satisfy 1<DT11/DT51<2.

In one embodiment, the maximum effective radius DT21 of the object side of the second lens, the maximum effective radius DT41 of the object side of the fourth lens, and the half of the diagonal length of the effective pixel area on the imaging plane of the optical imaging system, ImgH can satisfy 1 <(DT21+DT41)/ImgH<1.5.

This application uses five lenses. By reasonably allocating the power, surface type, center thickness of each lens, and the axial distance between each lens, etc., the above optical imaging system has ultra-thin and high resolution , At least one beneficial effect such as low cost.

BRIEF DESCRIPTION

With reference to the drawings, through the following detailed description of the non-limiting embodiments, other features, objects, and advantages of the present application will become more apparent. In the drawings:

1 shows a schematic structural view of an optical imaging system according to Example 1 of the present application; FIGS. 2A to 2D show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberrations of the optical imaging system of Example 1 respectively. curve;

FIG. 3 shows a schematic structural diagram of an optical imaging system according to Example 2 of the present application; FIGS. 4A to 4D respectively show an on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration of the optical imaging system of Example 2. curve;

5 shows a schematic structural diagram of an optical imaging system according to Example 3 of the present application; FIGS. 6A to 6D show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberrations of the optical imaging system of Example 3, respectively. curve;

7 shows a schematic structural diagram of an optical imaging system according to Example 4 of the present application; FIGS. 8A to 8D respectively show an on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration of the optical imaging system of Example 4. curve;

9 shows a schematic structural diagram of an optical imaging system according to Example 5 of the present application; FIGS. 10A to 10D show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberrations of the optical imaging system of Example 5 respectively. curve;

11 shows a schematic structural diagram of an optical imaging system according to Example 6 of the present application; FIGS. 12A to 12D show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberrations of the optical imaging system of Example 6 respectively. curve;

13 shows a schematic structural diagram of an optical imaging system according to Example 7 of the present application; FIGS. 14A to 14D show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberrations of the optical imaging system of Example 7 respectively. curve.

detailed description

In order to better understand the application, various aspects of the application will be described in more detail with reference to the drawings. It should be understood that these detailed descriptions are merely descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Therefore, without departing from the teaching of this application, the first lens discussed below may also be referred to as a second lens or a third lens.

In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for ease of explanation. Specifically, the shape of the spherical surface or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or aspherical surface is not limited to the shape of the spherical surface or aspherical surface shown in the drawings. The drawings are only examples and are not strictly drawn to scale.

In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is at least in the paraxial region. Concave surface. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging surface is called the image side of the lens.

It should also be understood that the terms "including", "including", "having", "including" and/or "including" when used in this specification indicate the presence of the stated features, elements and/or components , But does not exclude the presence or addition of one or more other features, elements, components, and/or combinations thereof. In addition, when an expression such as "at least one of" appears after the list of listed features, the entire listed feature is modified, rather than modifying individual elements in the list. In addition, when describing embodiments of the present application, use "may" to mean "one or more embodiments of the present application." Also, the term "exemplary" is intended to refer to an example or illustration.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having meanings consistent with their meaning in the context of related technologies, and will not be interpreted in an idealized or excessively formal sense unless This article clearly so limited.

It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments. The features, principles and other aspects of the present application are described in detail below.

The optical imaging system according to the exemplary embodiment of the present application may include, for example, five lenses having optical power, that is, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The five lenses are arranged in order along the optical axis from the object side to the image side. In the first lens to the fifth lens, any adjacent two lenses may have an air gap.

In an exemplary embodiment, the first lens may have positive power and its object side may be convex; the second lens may have negative power; the third lens may have negative power and its image side may be concave; The fourth lens has positive power or negative power; the fifth lens may have negative power, and the object side surface may be concave. Reasonable distribution of the effective focal length of the first lens to the fifth lens can reduce the deflection angle of the light, reduce the sensitivity of the tolerance of each lens, and improve the imaging quality of the optical system.

In an exemplary embodiment, the optical imaging system according to the present application may satisfy the conditional expression TTL/f<1, where TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis, and f is The total effective focal length of the optical imaging system. More specifically, TTL and f can further satisfy 0.88≤TTL/f≤0.95. Effectively compress the size of the system, ensure the compact size of the lens, and increase the size of the image surface reasonably, and ensure better imaging quality when taking into account the ultra-thin and large image surface.

In an exemplary embodiment, the optical imaging system according to the present application may satisfy the conditional expression f/ImgH>4.5, where f is the total effective focal length of the optical imaging system, and ImgH is the diagonal of the effective pixel area on the imaging surface of the optical imaging system Half the length of the line. More specifically, f and ImgH can further satisfy 4.90≦f/ImgH≦5.36. Satisfying the conditional formula f/ImgH>4.5 is conducive to achieving the characteristics of telephoto and super-large working image surface.

In an exemplary embodiment, the optical imaging system according to the present application may satisfy the conditional expression 0<R9/f5<1, where f5 is the effective focal length of the fifth lens and R9 is the radius of curvature of the object side of the fifth lens. More specifically, f5 and R9 can further satisfy 0.25≤R9/f5≤0.63. By reasonably controlling the ratio of the effective focal length of the fifth lens to the radius of curvature of its object side within a certain range, the deflection angle of the edge field of view at the fifth lens can be controlled, which can effectively reduce the sensitivity of the system and at the same time make the image of the fifth lens The inclination angle at the side edge is reduced, eliminating the risk of ghosts here.

In an exemplary embodiment, the optical imaging system according to the present application may satisfy the conditional expression 0<f2/f3<1, where f2 is the effective focal length of the second lens and f3 is the effective focal length of the third lens. More specifically, f2 and f3 may further satisfy 0.06≦f2/f3≦0.80. Reasonable distribution of the power of the second lens and the third lens can balance the aberration of the system, so that the optical system has a good balance ability.

In an exemplary embodiment, the optical imaging system according to the present application may satisfy the conditional expression 0<R1/R6<1.4, where R1 is the radius of curvature of the object side of the first lens and R6 is the curvature of the image side of the third lens radius. More specifically, R1 and R6 can further satisfy 0.04≦R1/R6≦1.10. Reasonable setting of the ratio of the radius of curvature of the first lens and the third lens can reduce the deflection angle of the light, make it easier to balance the aberration of the system, and improve the imaging quality of the system.

In an exemplary embodiment, the optical imaging system according to the present application may satisfy the conditional expression 0<(CT1+CT2)/f1<0.7, where f1 is the effective focal length of the first lens and CT1 is the first lens on the optical axis The center thickness of CT2 is the center thickness of the second lens on the optical axis. More specifically, f1, CT1, and CT2 may further satisfy 0.2<(CT1+CT2)/f1<0.6, for example, 0.34≦(CT1+CT2)/f1≦0.48. By reasonably controlling the ratio of the effective focal length of the first lens to the sum of the center thicknesses of the first and second lenses within a certain range, the first and second lenses can be used while ensuring a reasonable structure of the first and second lenses To correct the field curvature and astigmatism of the system.

In an exemplary embodiment, the optical imaging system according to the present application may satisfy the conditional expression 30<(V2+V3+V4)/3<40, where V2 is the dispersion coefficient of the second lens and V3 is the dispersion of the third lens Coefficient, V4 is the dispersion coefficient of the fourth lens. More specifically, V2, V3, and V4 may further satisfy 30<(V2+V3+V4)/3<35, for example, (V2+V3+V4)/3=33.34. Realizing different combinations of different optical materials can effectively reduce the chromatic aberration of the optical system and improve the resolution of the lens.

In an exemplary embodiment, the optical imaging system according to the present application may satisfy the conditional expression 0<T12*T45<0.2 mm ² , where T12 is the separation distance between the first lens and the second lens on the optical axis, and T45 is the first The separation distance between the four lens and the fifth lens on the optical axis. More specifically, T12 and T45 can further satisfy 0.04 mm ² ≦T12*T45≦0.15 mm ² . By controlling this relationship, the optical system has a better ability to balance the dispersion, and the purpose of controlling the effective focal length is achieved by adjusting the optical path of the air interval.

In an exemplary embodiment, the optical imaging system according to the present application may satisfy the conditional expression 0<CT5/(CT3+CT4)<0.5, where CT3 is the center thickness of the third lens on the optical axis and CT4 is the fourth lens The center thickness on the optical axis, CT5 is the center thickness of the fifth lens on the optical axis. More specifically, CT3, CT4, and CT5 may further satisfy 0.2<CT5/(CT3+CT4)<0.5, for example, 0.22≦CT5/(CT3+CT4)≦0.39. Reasonable distribution of the center thickness of the third lens, the fourth lens, and the fifth lens can ensure the good workability and at the same time enable the optical system to have a better ability to balance aberrations.

In an exemplary embodiment, the optical imaging system according to the present application may satisfy the conditional expression 4<TTL/ΣAT<5, where TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis , ∑AT is the sum of the separation distances of any two adjacent lenses on the optical axis from the first lens to the fifth lens. More specifically, TTL and ΣAT can further satisfy 4.18≦TTL/ΣAT≦4.83. Reasonable control of the air distance between the lens on the axis and the axis distance from the side of the first lens object to the imaging surface can ensure that the total length of the optical imaging lens is within an appropriate range, and at the same time it is beneficial to adjust the structure of the optical imaging lens and reduce lens processing and assembly Difficulty.

In an exemplary embodiment, the optical imaging system according to the present application may satisfy the conditional expression 1<DT11/DT51<2, where DT11 is the maximum effective radius of the object side of the first lens and DT51 is the object side of the fifth lens Maximum effective radius. More specifically, DT11 and DT51 can further satisfy 1.1<DT11/DT51<1.6, for example, 1.26≦DT11/DT51≦1.48. Reasonable control of the maximum effective radius of the first lens and the fifth lens can reduce the volume of the lens head, achieve the effect of a small head, and help to increase the screen ratio of the mobile phone.

In an exemplary embodiment, the optical imaging system according to the present application may satisfy the conditional expression 1<(DT21+DT41)/ImgH<1.5, where DT21 is the maximum effective radius of the object side of the second lens and DT41 is the fourth lens The maximum effective radius of the side of the object, ImgH, is half the diagonal length of the effective pixel area on the imaging surface of the optical imaging system. More specifically, DT21, DT41 and ImgH can further satisfy 1.21≤(DT21+DT41)/ImgH≤1.32. Reasonable control of the maximum effective radius of the second lens and the fourth lens can reduce the lens volume while ensuring the characteristics of the large image surface of the optical system.

In an exemplary embodiment, the above-mentioned optical imaging system may further include a diaphragm. The diaphragm may be provided between the object side and the first lens, for example. Those skilled in the art should understand that the diaphragm can be disposed at any position between the object side and the image side as needed.

Optionally, the above optical imaging system may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element located on the imaging surface.

The optical imaging system according to the above embodiments of the present application may employ multiple lenses, such as the five described above. By reasonably allocating the optical power, surface type, center thickness of each lens, and on-axis spacing between each lens, etc., the volume of the imaging system can be effectively reduced, the sensitivity of the imaging system can be reduced, and the imaging system can be improved. The processability makes the optical imaging system more conducive to production and processing and applicable to portable electronic products. The optical imaging system with the above configuration can also have beneficial effects such as ultra-thin, large image surface, high resolution, low cost, and high imaging quality, which can better meet the needs of most mobile phone lenses.

In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspheric mirror surface, that is, the object side surface of each of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens At least one of the sum image side is an aspheric mirror surface. The characteristics of aspheric lenses are: from the lens center to the lens periphery, the curvature is continuously changing. Unlike spherical lenses that have a constant curvature from the center of the lens to the periphery of the lens, aspheric lenses have better curvature radius characteristics, and have the advantages of improving distortion aberrations and improving astigmatic aberrations. With the use of aspheric lenses, the aberrations that occur during imaging can be eliminated as much as possible, thereby improving imaging quality. Optionally, the object side and the image side of each of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are aspherical mirror surfaces.

However, those skilled in the art should understand that the number of lenses constituting the optical imaging system can be changed to obtain the various results and advantages described in this specification without departing from the technical solution claimed in this application. For example, although the embodiment has been described with five lenses as an example, the optical imaging system is not limited to include five lenses. If desired, the optical imaging system may also include other numbers of lenses.

Specific examples of the optical imaging system applicable to the above-described embodiment will be further described below with reference to the drawings.

Example 1

The optical imaging system according to Embodiment 1 of the present application will be described below with reference to FIGS. 1 to 2D. FIG. 1 shows a schematic structural diagram of an optical imaging system according to Embodiment 1 of the present application.

As shown in FIG. 1, the optical imaging system according to the exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a third The four lens E4, the fifth lens E5, the filter E6, and the imaging surface S13.

The first lens E1 has positive refractive power, and its object side S1 is convex, and its image side S2 is convex. The second lens E2 has negative refractive power, and its object side surface S3 is concave and the image side surface S4 is concave. The third lens E3 has negative refractive power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive power, its object side S7 is convex, and the image side S8 is flat at the paraxial axis. The fifth lens E5 has negative power, its object side S9 is concave, and the image side S10 is flat at the paraxial axis. The filter E6 has an object side S11 and an image side S12. The light from the object sequentially passes through the surfaces S1 to S12 and is finally imaged on the imaging plane S13.

Table 1 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system of Example 1, wherein the units of radius of curvature and thickness are both millimeters (mm).

Table 1

In Example 1, the object side surface and the image side surface of any one of the first lens E1 to the fifth lens E5 are aspherical, and the surface type x of each aspherical lens can be defined by, but not limited to, the following aspherical formula :

Where x is the distance from the apex of the aspheric surface to the height of the aspheric surface at the height h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1/R (that is, the paraxial curvature c is the above table 1 is the reciprocal of the radius of curvature R); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below shows the high-order coefficients A ₄ , A ₆ , A ₈ , A ₁₀ , A ₁₂ , A ₁₄ , A ₁₆ , A ₁₈ and A ₂₀ that can be used for each aspherical mirror surface S1-S10 in Example 1. .

Face number	A4	A6	A8	A10	A12	A14	A16	A18	A20
S1	-1.1267E-03	2.3655E-04	-1.0395E-04	-4.4283E-05	6.5201E-05	-3.1763E-05	8.1863E-06	-1.1290E-06	6.5761E-08
S2	-1.5884E-02	3.4614E-02	-3.6444E-02	2.2487E-02	-8.4701E-03	1.9443E-03	-2.6040E-04	1.8067E-05	-4.6414E-07
S3	-1.0049E-02	2.9515E-02	-3.2400E-02	2.0340E-02	-7.7927E-03	1.8290E-03	-2.5318E-04	1.8645E-05	-5.5069E-07
S4	5.0337E-03	2.5450E-03	-2.2562E-03	-1.7734E-04	1.0875E-03	-7.4588E-04	2.6000E-04	-4.6637E-05	3.3130E-06
S5	-1.1579E-02	9.0709E-03	-2.9319E-03	-2.9917E-03	4.0812E-03	-2.4223E-03	8.4156E-04	-1.6080E-04	1.2726E-05
S6	-1.5881E-02	1.0964E-02	-8.1716E-03	4.3912E-03	-2.4041E-03	1.0201E-03	-1.7667E-04	-1.7920E-05	7.0101E-06
S7	-1.1070E-02	1.8860E-03	-1.3639E-03	-4.1375E-03	4.9686E-03	-3.0141E-03	1.0732E-03	-2.0442E-04	1.6632E-05
S8	-9.9748E-03	2.5892E-03	-5.5357E-03	2.5812E-03	-1.1801E-03	4.5465E-04	-5.9080E-05	-1.8987E-05	5.8243E-06
S9	-8.8786E-02	4.5386E-02	-4.6454E-02	4.5347E-02	-4.1493E-02	2.8458E-02	-1.2638E-02	3.1688E-03	-3.3570E-04
S10	-4.0147E-02	1.5395E-02	-2.3209E-02	3.3337E-02	-3.2725E-02	2.0345E-02	-7.6585E-03	1.5929E-03	-1.4033E-04

Table 2

Table 3 shows the ImgH, which is half the diagonal length of the effective pixel area on the imaging surface S13 in Example 1, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13, and the maximum half angle of view HFOV , The aperture value Fno, the total effective focal length f of the optical imaging system, and the effective focal lengths f1 to f5 of the lenses.

ImgH(mm)	2.70	f1(mm)	5.56
TTL(mm)	12.67	f2(mm)	-11.36
HFOV(°)	10.4	f3(mm)	-26.55
Fno	3.47	f4(mm)	34.70
f(mm)	14.47	f5(mm)	-12.26

table 3

2A shows an on-axis chromatic aberration curve of the optical imaging system of Example 1, which indicates that rays of different wavelengths will deviate from the focal point after passing through the lens. 2B shows the astigmatism curve of the optical imaging system of Example 1, which represents meridional image plane curvature and sagittal image plane curvature. FIG. 2C shows the distortion curve of the optical imaging system of Example 1, which represents the distortion magnitude value under different fields of view. FIG. 2D shows the magnification chromatic aberration curve of the optical imaging system of Example 1, which represents the deviation of different image heights on the imaging plane of light rays passing through the lens. It can be seen from FIGS. 2A to 2D that the optical imaging system provided in Embodiment 1 can achieve good imaging quality.

Example 2

The optical imaging system according to Embodiment 2 of the present application will be described below with reference to FIGS. 3 to 4D. In this embodiment and the following embodiments, for the sake of brevity, descriptions similar to those of Embodiment 1 will be omitted. FIG. 3 shows a schematic structural diagram of an optical imaging system according to Embodiment 2 of the present application.

As shown in FIG. 3, the optical imaging system according to the exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a third The four lens E4, the fifth lens E5, the filter E6, and the imaging surface S13.

The first lens E1 has positive refractive power, and its object side S1 is convex, and its image side S2 is convex. The second lens E2 has negative refractive power, and its object side surface S3 is concave and the image side surface S4 is concave. The third lens E3 has negative refractive power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive refractive power, and its object side surface S7 is a concave surface, and its image side surface S8 is a convex surface. The fifth lens E5 has negative power, its object side S9 is concave, and the image side S10 is flat at the paraxial axis. The filter E6 has an object side S11 and an image side S12. The light from the object sequentially passes through the surfaces S1 to S12 and is finally imaged on the imaging plane S13.

Table 4 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system of Example 2, wherein the units of radius of curvature and thickness are both millimeters (mm).

Table 4

In Example 2, the object side and the image side of any one of the first lens E1 to the fifth lens E5 are aspherical. Table 5 shows the higher-order coefficients that can be used for each aspherical mirror surface in Example 2, where each aspherical surface type can be defined by the formula (1) given in Example 1 above.

Face number	A4	A6	A8	A10	A12	A14	A16	A18	A20
S1	-4.4844E-04	-7.0879E-04	3.1100E-04	-6.7831E-05	-2.5646E-05	2.3561E-05	-7.0819E-06	9.8286E-07	-5.2677E-08
S2	-5.4309E-03	1.8276E-02	-2.3834E-02	1.7991E-02	-8.2433E-03	2.2805E-03	-3.6734E-04	3.1177E-05	-1.0467E-06
S3	-6.2315E-03	2.4222E-02	-2.9793E-02	2.1843E-02	-1.0067E-02	2.8751E-03	-4.8988E-04	4.5384E-05	-1.7506E-06
S4	-1.2232E-02	3.8952E-02	-4.5191E-02	3.5593E-02	-2.0404E-02	8.0101E-03	-1.9978E-03	2.8353E-04	-1.7421E-05
S5	-3.0456E-02	5.5812E-02	-6.5064E-02	5.5227E-02	-3.4974E-02	1.5396E-02	-4.3381E-03	6.9787E-04	-4.8619E-05
S6	-1.9842E-02	3.0428E-02	-4.2242E-02	4.5841E-02	-3.7397E-02	2.0701E-02	-7.1114E-03	1.3446E-03	-1.0445E-04
S7	-7.3497E-03	1.6694E-02	-1.1608E-02	-1.3024E-02	3.1750E-02	-3.1671E-02	1.7284E-02	-5.0296E-03	6.1715E-04
S8	-1.1701E-02	1.7898E-02	-1.3374E-02	-6.1852E-03	2.0617E-02	-2.1459E-02	1.1740E-02	-3.3471E-03	3.9594E-04
S9	-7.8183E-02	4.0263E-02	-4.8455E-02	5.6042E-02	-5.0019E-02	2.9294E-02	-1.0544E-02	2.0852E-03	-1.6734E-04
S10	-4.6174E-02	2.3792E-02	-3.6019E-02	4.6072E-02	-3.9515E-02	2.1517E-02	-7.1738E-03	1.3383E-03	-1.0696E-04

table 5

Table 6 shows the ImgH, which is half the diagonal of the effective pixel area on the imaging plane S13 in Example 2, the distance TTL on the optical axis from the object side S1 of the first lens E1 to the imaging plane S13, and the maximum half angle of view HFOV , The aperture value Fno, the total effective focal length f of the optical imaging system, and the effective focal lengths f1 to f5 of the lenses.

ImgH(mm)	2.70	f1(mm)	5.06
TTL(mm)	12.69	f2(mm)	-11.65
HFOV(°)	10.5	f3(mm)	-14.59
Fno	3.47	f4(mm)	34.95
f(mm)	14.46	f5(mm)	-14.10

Table 6

FIG. 4A shows the on-axis chromatic aberration curve of the optical imaging system of Example 2, which indicates that rays of different wavelengths will deviate from the focal point after passing through the lens. 4B shows the astigmatism curve of the optical imaging system of Example 2, which represents meridional image plane curvature and sagittal image plane curvature. FIG. 4C shows the distortion curve of the optical imaging system of Example 2, which represents the distortion magnitude value under different fields of view. 4D shows the magnification chromatic aberration curve of the optical imaging system of Example 2, which represents the deviation of different image heights on the imaging plane of light rays passing through the lens. It can be seen from FIGS. 4A to 4D that the optical imaging system provided in Embodiment 2 can achieve good imaging quality.

Example 3

The optical imaging system according to Embodiment 3 of the present application is described below with reference to FIGS. 5 to 6D. FIG. 5 shows a schematic structural diagram of an optical imaging system according to Embodiment 3 of the present application.

As shown in FIG. 5, the optical imaging system according to the exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a The four lens E4, the fifth lens E5, the filter E6, and the imaging surface S13.

The first lens E1 has positive refractive power, and its object side S1 is convex, and its image side S2 is convex. The second lens E2 has negative refractive power, and its object side surface S3 is concave and the image side surface S4 is concave. The third lens E3 has negative refractive power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive refractive power, and its object side surface S7 is a concave surface, and its image side surface S8 is a convex surface. The fifth lens E5 has negative refractive power, the object side surface S9 is a concave surface, and the image side surface S10 is a convex surface. The filter E6 has an object side S11 and an image side S12. The light from the object sequentially passes through the surfaces S1 to S12 and is finally imaged on the imaging plane S13.

Table 7 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system of Example 3, where the units of radius of curvature and thickness are both millimeters (mm).

Table 7

In Example 3, the object side and the image side of any of the first lens E1 to the fifth lens E5 are aspherical. Table 8 shows the high-order coefficients that can be used for each aspherical mirror surface in Example 3, where each aspherical surface type can be defined by the formula (1) given in Example 1 above.

Face number	A4	A6	A8	A10	A12	A14	A16	A18	A20
S1	-1.3987E-03	8.4417E-04	-2.8331E-05	-2.3059E-04	1.4153E-04	-4.4902E-05	8.3826E-06	-8.7804E-07	3.9921E-08
S2	1.5663E-03	1.7106E-03	-3.8196E-03	2.3450E-03	-4.9076E-04	-4.8054E-05	3.8599E-05	-6.3025E-06	3.5671E-07
S3	1.1616E-02	-1.1636E-02	4.3596E-03	-1.5694E-04	-2.5812E-04	4.3164E-05	4.4731E-06	-1.6973E-06	1.2273E-07
S4	3.1745E-02	-5.0489E-02	4.7490E-02	-2.9899E-02	1.3457E-02	-4.2244E-03	8.6089E-04	-1.0149E-04	5.2621E-06
S5	1.4244E-02	-4.8253E-02	5.3282E-02	-3.8323E-02	1.8974E-02	-6.1993E-03	1.2418E-03	-1.3839E-04	6.8734E-06
S6	2.6885E-04	-1.3116E-02	1.8706E-02	-1.7213E-02	1.0591E-02	-4.0493E-03	9.1045E-04	-1.2300E-04	1.0213E-05
S7	2.9199E-03	-4.2288E-03	4.8854E-03	-7.7173E-03	6.8186E-03	-3.4402E-03	8.9803E-04	-9.6491E-05	1.9783E-06
S8	7.1449E-04	-2.3015E-03	2.4581E-03	-4.6948E-03	4.5010E-03	-2.5295E-03	7.6218E-04	-1.0480E-04	4.4943E-06
S9	-4.6860E-02	1.5979E-02	-1.0949E-02	2.1117E-03	4.3839E-03	-5.0659E-03	2.2990E-03	-4.6930E-04	3.3781E-05
S10	-1.0574E-02	-4.5786E-03	-6.2197E-04	4.2431E-03	-3.4428E-03	1.1347E-03	-1.0152E-04	-2.3368E-05	4.0989E-06

Table 8

Table 9 shows the ImgH, which is half the diagonal length of the effective pixel area on the imaging surface S13 in Example 3, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13, and the maximum half angle of view HFOV , The aperture value Fno, the total effective focal length f of the optical imaging system, and the effective focal lengths f1 to f5 of the lenses.

ImgH(mm)	2.70	f1(mm)	6.08
TTL(mm)	12.78	f2(mm)	-9.99
HFOV(°)	10.4	f3(mm)	-157.04
Fno	3.31	f4(mm)	23.28
f(mm)	14.47	f5(mm)	-11.72

Table 9

FIG. 6A shows an on-axis chromatic aberration curve of the optical imaging system of Example 3, which indicates that rays of different wavelengths will deviate from the focal point after passing through the lens. 6B shows the astigmatism curve of the optical imaging system of Example 3, which represents meridional image plane curvature and sagittal image plane curvature. FIG. 6C shows the distortion curve of the optical imaging system of Example 3, which represents the distortion magnitude value under different fields of view. 6D shows the magnification chromatic aberration curve of the optical imaging system of Example 3, which represents the deviation of different image heights on the imaging plane of light rays passing through the lens. It can be seen from FIGS. 6A to 6D that the optical imaging system provided in Embodiment 3 can achieve good imaging quality.

Example 4

The optical imaging system according to Embodiment 4 of the present application is described below with reference to FIGS. 7 to 8D. 7 shows a schematic structural diagram of an optical imaging system according to Embodiment 4 of the present application.

As shown in FIG. 7, the optical imaging system according to the exemplary embodiment of the present application includes, in order from the object side to the image side, along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a third The four lens E4, the fifth lens E5, the filter E6, and the imaging surface S13.

The first lens E1 has positive refractive power, and its object side S1 is convex, and its image side S2 is convex. The second lens E2 has negative refractive power, and its object side surface S3 is concave and the image side surface S4 is concave. The third lens E3 has negative refractive power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has negative refractive power, and its object side surface S7 is concave and the image side surface S8 is convex. The fifth lens E5 has negative refractive power, the object side surface S9 is a concave surface, and the image side surface S10 is a convex surface. The filter E6 has an object side S11 and an image side S12. The light from the object sequentially passes through the surfaces S1 to S12 and is finally imaged on the imaging plane S13.

Table 10 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system of Example 4, wherein the units of radius of curvature and thickness are both millimeters (mm).

Table 10

In Example 4, the object side and the image side of any one of the first lens E1 to the fifth lens E5 are aspherical. Table 11 shows the coefficients of higher order that can be used for each aspherical mirror surface in Example 4, where each aspherical surface type can be defined by the formula (1) given in Example 1 above.

Face number	A4	A6	A8	A10	A12	A14	A16	A18	A20
S1	-1.1727E-03	1.6649E-06	6.9576E-05	-1.5404E-04	9.5037E-05	-2.8959E-05	4.6028E-06	-3.2753E-07	6.0604E-09
S2	-7.2358E-03	1.5173E-02	-1.5574E-02	8.6735E-03	-2.4602E-03	2.0536E-04	6.3610E-05	-1.6989E-05	1.1948E-06
S3	-2.5785E-03	1.3568E-02	-1.5269E-02	9.2865E-03	-3.0927E-03	4.7867E-04	1.0367E-06	-9.5621E-06	8.3234E-07
S4	5.0187E-03	1.0470E-03	-3.7842E-03	4.7837E-03	-3.3979E-03	1.4372E-03	-3.6728E-04	5.3434E-05	-3.4489E-06
S5	-6.6546E-03	1.3276E-03	-2.0408E-03	4.1043E-03	-3.7643E-03	1.8821E-03	-5.5042E-04	9.0470E-05	-6.5280E-06
S6	-9.2038E-03	6.9962E-04	-9.4711E-04	2.6783E-03	-3.6421E-03	2.4574E-03	-9.5863E-04	2.0839E-04	-1.9470E-05
S7	-9.7468E-03	-6.0960E-04	8.6054E-04	-3.0478E-03	3.6576E-03	-3.0873E-03	1.5830E-03	-4.5088E-04	5.5295E-05
S8	-8.8393E-03	2.3409E-03	-1.6545E-03	2.0013E-03	-2.3078E-03	1.6046E-03	-6.7251E-04	1.5572E-04	-1.5145E-05

S9	-9.6574E-02	7.4850E-02	-8.5955E-02	8.3668E-02	-6.0316E-02	2.9787E-02	-9.4524E-03	1.7247E-03	-1.3688E-04
S10	-2.6900E-02	4.2896E-03	-1.5529E-03	1.1428E-03	-8.3714E-04	3.9121E-04	-1.0952E-04	1.6814E-05	-1.0854E-06

Table 11

Table 12 shows the ImgH, which is half the diagonal of the effective pixel area on the imaging surface S13 in Example 4, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13, and the maximum half angle of view HFOV , The aperture value Fno, the total effective focal length f of the optical imaging system, and the effective focal lengths f1 to f5 of the lenses.

ImgH(mm)	2.70	f1(mm)	6.09
TTL(mm)	12.76	f2(mm)	-15.19
HFOV(°)	11.2	f3(mm)	-101.17
Fno	3.35	f4(mm)	-105.86
f(mm)	13.73	f5(mm)	-16.48

Table 12

FIG. 8A shows the on-axis chromatic aberration curve of the optical imaging system of Example 4, which indicates that rays of different wavelengths will deviate from the focal point after passing through the lens. 8B shows the astigmatism curve of the optical imaging system of Example 4, which represents meridional image plane curvature and sagittal image plane curvature. FIG. 8C shows the distortion curve of the optical imaging system of Example 4, which represents the distortion magnitude value under different fields of view. 8D shows the magnification chromatic aberration curve of the optical imaging system of Example 4, which represents the deviation of different image heights on the imaging plane of light rays passing through the lens. It can be known from FIGS. 8A to 8D that the optical imaging system provided in Embodiment 4 can achieve good imaging quality.

Example 5

The optical imaging system according to Embodiment 5 of the present application is described below with reference to FIGS. 9 to 10D. 9 shows a schematic structural diagram of an optical imaging system according to Embodiment 5 of the present application.

As shown in FIG. 9, the optical imaging system according to the exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a The four lens E4, the fifth lens E5, the filter E6, and the imaging surface S13.

The first lens E1 has positive refractive power, its object side S1 is convex, and its image side S2 is concave. The second lens E2 has negative refractive power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has negative refractive power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive refractive power, and its object side surface S7 is a concave surface, and its image side surface S8 is a convex surface. The fifth lens E5 has negative refractive power, the object side surface S9 is a concave surface, and the image side surface S10 is a convex surface. The filter E6 has an object side S11 and an image side S12. The light from the object sequentially passes through the surfaces S1 to S12 and is finally imaged on the imaging plane S13.

Table 13 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system of Example 5, wherein the units of radius of curvature and thickness are both millimeters (mm).

Table 13

In Example 5, the object side and the image side of any one of the first lens E1 to the fifth lens E5 are aspherical. Table 14 shows the coefficients of higher order that can be used for each aspherical mirror surface in Example 5, where each aspherical surface type can be defined by the formula (1) given in Example 1 above.

Face number	A4	A6	A8	A10	A12	A14	A16	A18	A20
S1	-1.5049E-03	4.9177E-04	-7.6924E-05	-1.6264E-04	1.0720E-04	-2.7454E-05	2.6601E-06	5.9943E-08	-1.7996E-08
S2	-1.9893E-02	4.1835E-02	-4.3733E-02	2.6253E-02	-9.4458E-03	2.0425E-03	-2.5434E-04	1.6181E-05	-3.7408E-07
S3	-1.3956E-02	3.6471E-02	-4.0349E-02	2.5081E-02	-9.2476E-03	2.0268E-03	-2.5127E-04	1.5261E-05	-2.9167E-07
S4	1.3666E-02	-1.7081E-03	-6.7742E-03	8.4598E-03	-4.7603E-03	1.4368E-03	-2.3543E-04	1.9603E-05	-6.8833E-07
S5	-1.9624E-03	-1.5332E-03	-4.2415E-03	7.4132E-03	-4.8385E-03	1.5858E-03	-2.7745E-04	2.6456E-05	-1.3284E-06
S6	-8.2200E-03	6.2080E-04	-3.3270E-03	6.4443E-03	-5.8290E-03	2.7341E-03	-7.5038E-04	1.2414E-04	-1.0043E-05
S7	-1.2183E-02	-5.6606E-04	3.1217E-03	-7.9898E-03	9.9073E-03	-7.9416E-03	3.7736E-03	-9.7284E-04	1.0607E-04
S8	-7.7820E-03	-3.0561E-04	7.0527E-03	-1.1662E-02	1.0626E-02	-6.0241E-03	2.0455E-03	-3.7761E-04	2.9011E-05
S9	-9.1968E-02	7.2555E-02	-8.3297E-02	8.0468E-02	-5.8670E-02	2.9420E-02	-9.4935E-03	1.7591E-03	-1.4182E-04
S10	-2.9048E-02	4.6322E-03	-2.1435E-03	1.3191E-03	-9.9960E-04	4.9667E-04	-1.4810E-04	2.4036E-05	-1.6363E-06

Table 14

Table 15 shows the ImgH, which is half the diagonal of the effective pixel area on the imaging surface S13 in Example 5, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13, and the maximum half angle of view HFOV , The aperture value Fno, the total effective focal length f of the optical imaging system, and the effective focal lengths f1 to f5 of the lenses.

ImgH(mm)	2.70	f1(mm)	6.60
TTL(mm)	12.99	f2(mm)	-13.79
HFOV(°)	11.2	f3(mm)	-105.46
Fno	3.39	f4(mm)	2119.59
f(mm)	13.91	f5(mm)	-24.14

Table 15

FIG. 10A shows an on-axis chromatic aberration curve of the optical imaging system of Example 5, which indicates that rays of different wavelengths will deviate from the focal point after passing through the lens. 10B shows the astigmatism curve of the optical imaging system of Example 5, which represents meridional image plane curvature and sagittal image plane curvature. FIG. 10C shows the distortion curve of the optical imaging system of Example 5, which represents the distortion magnitude value under different fields of view. 10D shows the magnification chromatic aberration curve of the optical imaging system of Example 5, which represents the deviation of different image heights on the imaging plane of light rays passing through the lens. As can be seen from FIGS. 10A to 10D, the optical imaging system provided in Embodiment 5 can achieve good imaging quality.

Example 6

The optical imaging system according to Embodiment 6 of the present application is described below with reference to FIGS. 11 to 12D. 11 shows a schematic structural diagram of an optical imaging system according to Embodiment 6 of the present application.

As shown in FIG. 11, the optical imaging system according to the exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a The four lens E4, the fifth lens E5, the filter E6, and the imaging surface S13.

The first lens E1 has positive refractive power, and its object side S1 is convex, and its image side S2 is convex. The second lens E2 has negative refractive power, and its object side surface S3 is concave and the image side surface S4 is convex. The third lens E3 has negative refractive power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive refractive power, and its object side surface S7 is a concave surface, and its image side surface S8 is a convex surface. The fifth lens E5 has negative refractive power, the object side surface S9 is a concave surface, and the image side surface S10 is a convex surface. The filter E6 has an object side S11 and an image side S12. The light from the object sequentially passes through the surfaces S1 to S12 and is finally imaged on the imaging plane S13.

Table 16 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system of Example 6, wherein the units of radius of curvature and thickness are both millimeters (mm).

Table 16

In Example 6, the object side and the image side of any of the first lens E1 to the fifth lens E5 are aspherical. Table 17 shows the high-order coefficients that can be used for each aspherical mirror surface in Example 6, where each aspherical surface type can be defined by the formula (1) given in Example 1 above.

Face number	A4	A6	A8	A10	A12	A14	A16	A18	A20
S1	-1.1551E-03	-1.6849E-04	3.2962E-04	-3.9592E-04	2.2298E-04	-7.1284E-05	1.3326E-05	-1.3736E-06	6.1844E-08
S2	-5.0704E-03	1.0457E-02	-6.8037E-03	4.3499E-04	1.7122E-03	-9.7490E-04	2.4165E-04	-2.8900E-05	1.3490E-06
S3	-4.7998E-03	1.3744E-02	-1.1575E-02	4.4601E-03	-3.1712E-04	-3.5630E-04	1.2935E-04	-1.7642E-05	8.6082E-07
S4	4.8630E-03	6.3294E-03	-9.2550E-03	7.0177E-03	-3.3296E-03	1.0150E-03	-1.9971E-04	2.4368E-05	-1.4673E-06
S5	-9.6696E-03	8.0194E-03	-1.0065E-02	9.2182E-03	-5.6600E-03	2.3366E-03	-6.3438E-04	1.0425E-04	-7.8707E-06

S6	-1.1051E-02	3.3610E-03	-5.0547E-03	5.5473E-03	-4.5309E-03	2.4963E-03	-8.8659E-04	1.8629E-04	-1.7513E-05
S7	-7.3188E-03	-2.1189E-03	-2.0636E-03	2.2756E-03	-3.1079E-03	2.7076E-03	-1.4479E-03	4.3450E-04	-5.4548E-05
S8	-3.6250E-03	-1.7364E-03	4.3237E-05	-1.3014E-03	1.4179E-03	-8.6694E-04	3.1785E-04	-6.0950E-05	4.6148E-06
S9	-1.0015E-01	9.0244E-02	-1.1241E-01	1.1519E-01	-8.7845E-02	4.6211E-02	-1.5682E-02	3.0787E-03	-2.6453E-04
S10	-2.7387E-02	6.0197E-03	-3.2601E-03	2.4226E-03	-1.7333E-03	8.8826E-04	-2.8672E-04	5.2747E-05	-4.2036E-06

Table 17

Table 18 shows the half-diagonal length of the effective pixel area on the imaging plane S13 in Example 6, ImgH, the distance from the object side S1 of the first lens E1 to the imaging plane S13 on the optical axis, and the maximum half angle of view HFOV , The aperture value Fno, the total effective focal length f of the optical imaging system, and the effective focal lengths f1 to f5 of the lenses.

ImgH(mm)	2.70	f1(mm)	5.90
TTL(mm)	12.59	f2(mm)	-13.71
HFOV(°)	11.0	f3(mm)	-100.36
Fno	3.31	f4(mm)	64.80
f(mm)	13.77	f5(mm)	-10.96

Table 18

FIG. 12A shows an on-axis chromatic aberration curve of the optical imaging system of Example 6, which indicates that rays of different wavelengths will deviate from the focal point after passing through the lens. 12B shows the astigmatism curve of the optical imaging system of Example 6, which represents meridional image plane curvature and sagittal image plane curvature. FIG. 12C shows the distortion curve of the optical imaging system of Example 6, which represents the distortion magnitude value under different fields of view. 12D shows the magnification chromatic aberration curve of the optical imaging system of Example 6, which represents the deviation of different image heights on the imaging plane of light rays passing through the lens. It can be seen from FIGS. 12A to 12D that the optical imaging system provided in Embodiment 6 can achieve good imaging quality.

Example 7

The optical imaging system according to Embodiment 7 of the present application is described below with reference to FIGS. 13 to 14D. 13 shows a schematic structural diagram of an optical imaging system according to Embodiment 7 of the present application.

As shown in FIG. 13, the optical imaging system according to the exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a The four lens E4, the fifth lens E5, the filter E6, and the imaging surface S13.

The first lens E1 has positive refractive power, and its object side S1 is convex, and its image side S2 is convex. The second lens E2 has negative refractive power, and its object side surface S3 is concave and the image side surface S4 is convex. The third lens E3 has negative refractive power, and its object side surface S5 is concave and the image side surface S6 is concave. The fourth lens E4 has negative refractive power, and its object side surface S7 is concave and the image side surface S8 is convex. The fifth lens E5 has negative refractive power, and its object side surface S9 is concave and the image side surface S10 is concave. The filter E6 has an object side S11 and an image side S12. The light from the object sequentially passes through the surfaces S1 to S12 and is finally imaged on the imaging plane S13.

Table 19 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system of Example 7, wherein the units of radius of curvature and thickness are both millimeters (mm).

Table 19

In Example 7, the object side and the image side of any one of the first lens E1 to the fifth lens E5 are aspherical. Table 20 shows the coefficients of higher order that can be used for each aspherical mirror surface in Example 7, where each aspherical surface type can be defined by the formula (1) given in Example 1 above.

Face number	A4	A6	A8	A10	A12	A14	A16	A18	A20
S1	-1.1830E-03	-8.6345E-07	4.8061E-05	-1.2626E-04	7.7479E-05	-2.4747E-05	4.6165E-06	-4.9118E-07	2.4407E-08
S2	-4.1134E-03	1.0288E-02	-8.6813E-03	3.3753E-03	-4.2721E-04	-1.1747E-04	4.7685E-05	-5.6321E-06	1.9604E-07
S3	-3.8938E-03	1.2288E-02	-1.1420E-02	5.7827E-03	-1.7033E-03	2.9512E-04	-3.3322E-05	3.3910E-06	-2.5002E-07
S4	7.0964E-03	2.7590E-03	-5.6080E-03	4.4151E-03	-2.1082E-03	6.4264E-04	-1.2779E-04	1.6366E-05	-1.0644E-06
S5	-5.0845E-03	3.3622E-03	-5.8415E-03	5.4696E-03	-3.1897E-03	1.2061E-03	-2.9641E-04	4.5243E-05	-3.3005E-06
S6	-1.0576E-02	9.5479E-04	-2.0272E-03	1.6873E-03	-8.2101E-04	1.3121E-04	5.7444E-05	-2.7885E-05	3.4807E-06
S7	-5.6928E-03	-2.4629E-03	-5.6404E-04	-6.1055E-04	8.5037E-04	-6.3174E-04	2.5316E-04	-4.6334E-05	2.9479E-06
S8	-4.8815E-03	-4.1028E-04	-2.8444E-04	-7.0042E-04	8.6816E-04	-5.8258E-04	2.3501E-04	-5.1064E-05	4.6406E-06
S9	-7.6550E-02	4.5210E-02	-4.2155E-02	3.5655E-02	-2.3366E-02	1.0744E-02	-3.2130E-03	5.5923E-04	-4.2756E-05
S10	-3.2469E-02	8.0898E-03	-2.6065E-03	8.9880E-04	-2.7426E-04	5.7264E-05	-4.6136E-06	-5.0336E-07	9.4500E-08

Table 20

Table 21 shows the ImgH, which is half the diagonal of the effective pixel area on the imaging surface S13 in Example 7, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13, and the maximum half angle of view HFOV , The aperture value Fno, the total effective focal length f of the optical imaging system, and the effective focal lengths f1 to f5 of the lenses.

ImgH(mm)	2.70	f1(mm)	5.65
TTL(mm)	12.51	f2(mm)	-17.18
HFOV(°)	11.4	f3(mm)	-94.78
Fno	3.18	f4(mm)	-527.57
f(mm)	13.22	f5(mm)	-10.25

Table 21

14A shows an on-axis chromatic aberration curve of the optical imaging system of Example 7, which indicates that rays of different wavelengths will deviate from the focal point after passing through the lens. 14B shows the astigmatism curve of the optical imaging system of Example 7, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 14C shows the distortion curve of the optical imaging system of Example 7, which represents the distortion magnitude value under different fields of view. 14D shows the magnification chromatic aberration curve of the optical imaging system of Example 7, which represents the deviation of different image heights on the imaging plane of light rays passing through the lens. It can be seen from FIGS. 14A to 14D that the optical imaging system provided in Example 7 can achieve good imaging quality.

In summary, Examples 1 to 7 satisfy the relationships shown in Table 22, respectively.

Conditional expression/Example	1	2	3	4	5	6	7
TTL/f	0.88	0.88	0.88	0.93	0.93	0.91	0.95
DT11/DT51	1.48	1.47	1.44	1.28	1.26	1.39	1.36
f/ImgH	5.36	5.36	5.36	5.09	5.15	5.10	4.90
(V2+V3+V4)/3	33.34	33.34	33.34	33.34	33.34	33.34	33.34
(CT1+CT2)/f1	0.43	0.48	0.35	0.39	0.34	0.40	0.45
f2/f3	0.43	0.80	0.06	0.15	0.13	0.14	0.18
R1/R6	0.61	0.62	1.10	0.61	0.74	0.60	0.04
R9/f5	0.55	0.55	0.47	0.33	0.25	0.46	0.63
TTL/∑AT	4.54	4.48	4.40	4.62	4.83	4.18	4.19
CT5/(CT3+CT4)	0.27	0.29	0.35	0.39	0.29	0.22	0.26
(DT21+DT41)/ImgH	1.25	1.25	1.32	1.22	1.21	1.25	1.25
T12*T45(mm 2 )	0.04	0.04	0.07	0.06	0.06	0.15	0.13

Table 22

The present application also provides an imaging device whose electronic photosensitive element may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging apparatus may be an independent imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging system described above.

The above description is only the preferred embodiment of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solution formed by the specific combination of the above technical features, but should also cover the above technical features without departing from the inventive concept. Or other technical solutions formed by any combination of their equivalent features. For example, a technical solution formed by replacing the above features with technical features disclosed in this application (but not limited to) but having similar functions.

Claims (23)

1. The optical imaging system includes, in order from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, characterized in that:

   The first lens has positive power and its object side is convex; the second lens has negative power; the third lens has negative power and its image side is concave; the fourth lens has Positive power or negative power; the fifth lens has negative power and the object side is concave;

   The distance TTL on the optical axis from the object side of the first lens to the imaging plane of the optical imaging system, the total effective focal length f of the optical imaging system, and the effective pixel area on the imaging plane of the optical imaging system Half of the diagonal length ImgH satisfies: TTL/f≤0.95; and f/ImgH>4.5.
2. The optical imaging system according to claim 1, wherein the radius of curvature R9 of the object side of the fifth lens and the effective focal length f5 of the fifth lens satisfy 0<R9/f5<1.
3. The optical imaging system according to claim 1, wherein the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy 0<f2/f3<1.
4. The optical imaging system according to claim 1, wherein the radius of curvature R1 of the object side of the first lens and the radius of curvature R6 of the image side of the third lens satisfy 0<R1/R6<1.4.
5. The optical imaging system according to claim 1, wherein the center thickness of the first lens on the optical axis CT1, the center thickness of the second lens on the optical axis CT2 and the first The effective focal length f1 of a lens satisfies 0<(CT1+CT2)/f1<0.7.
6. The optical imaging system according to claim 1, wherein the dispersion coefficient V2 of the second lens, the dispersion coefficient V3 of the third lens, and the dispersion coefficient V4 of the fourth lens satisfy 30<(V2+ V3+V4)/3<40.
7. The optical imaging system according to claim 1, wherein the separation distance T12 of the first lens and the second lens on the optical axis is between the fourth lens and the fifth lens. The separation distance T45 on the optical axis satisfies 0<T12*T45<0.2 mm ² .
8. The optical imaging system according to claim 1, wherein the center thickness of the third lens on the optical axis CT3, the center thickness of the fourth lens on the optical axis CT4 and the first The central thickness CT5 of the five lenses on the optical axis satisfies 0<CT5/(CT3+CT4)<0.5.
9. The optical imaging system according to claim 8, characterized in that the distance TTL on the optical axis between the object side surface of the first lens and the imaging surface of the optical imaging system and the first lens to the The sum of the separation distance ΣAT of any two adjacent lenses on the optical axis in the fifth lens satisfies 4<TTL/ΣAT<5.
10. The optical imaging system according to any one of claims 1 to 9, wherein the maximum effective radius DT11 of the object side of the first lens and the maximum effective radius DT51 of the object side of the fifth lens satisfy 1 ＜DT11/DT51＜2.
11. The optical imaging system according to any one of claims 1 to 9, wherein the maximum effective radius of the object side of the second lens DT21, the maximum effective radius of the object side of the fourth lens DT41 and all The half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging system ImgH satisfies 1<(DT21+DT41)/ImgH<1.5.
12. The optical imaging system includes, in order from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, characterized in that:

    The first lens has positive power and its object side is convex; the second lens has negative power; the third lens has negative power and its image side is concave; the fourth lens has Positive power or negative power; the fifth lens has negative power and its object side is concave; and the object side of the first lens to the imaging plane of the optical imaging system is on the optical axis The sum of the distance TTL and the separation distance ΣAT of any two adjacent lenses from the first lens to the fifth lens on the optical axis satisfies 4<TTL/ΣAT<5.
13. 12. The optical imaging system according to claim 12, wherein the center thickness of the first lens on the optical axis CT1, the center thickness of the second lens on the optical axis CT2 and the first The effective focal length f1 of a lens satisfies 0<(CT1+CT2)/f1<0.7.
14. The optical imaging system according to claim 13, wherein the center thickness of the third lens on the optical axis CT3, the center thickness of the fourth lens on the optical axis CT4 and the first The central thickness CT5 of the five lenses on the optical axis satisfies 0<CT5/(CT3+CT4)<0.5.
15. 12. The optical imaging system according to claim 12, wherein the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy 0<f2/f3<1.
16. 12. The optical imaging system according to claim 12, wherein the radius of curvature R9 of the object side of the fifth lens and the effective focal length f5 of the fifth lens satisfy 0<R9/f5<1.
17. 12. The optical imaging system according to claim 12, wherein the radius of curvature R1 of the object side of the first lens and the radius of curvature R6 of the image side of the third lens satisfy 0<R1/R6<1.4.
18. The optical imaging system according to claim 15, wherein the dispersion coefficient V2 of the second lens, the dispersion coefficient V3 of the third lens, and the dispersion coefficient V4 of the fourth lens satisfy 30<(V2+ V3+V4)/3<40.
19. 12. The optical imaging system according to claim 12, wherein the first lens and the second lens are separated from the fourth lens and the fifth lens by a separation distance T12 on the optical axis. The separation distance T45 on the optical axis satisfies 0<T12*T45<0.2 mm ² .
20. 12. The optical imaging system according to claim 12, wherein the maximum effective radius DT11 of the object side of the first lens and the maximum effective radius DT51 of the object side of the fifth lens satisfy 1<DT11/DT51<2 .
21. The optical imaging system of claim 20, wherein the maximum effective radius DT21 of the object side of the second lens, the maximum effective radius DT41 of the object side of the fourth lens, and the imaging of the optical imaging system Half the diagonal length of the effective pixel area on the surface, ImgH, satisfies 1<(DT21+DT41)/ImgH<1.5.
22. The optical imaging system according to any one of claims 12 to 21, characterized in that the distance TTL on the optical axis between the object side surface of the first lens and the imaging surface of the optical imaging system and the The total effective focal length f of the optical imaging system satisfies TTL/f<1.
23. The optical imaging system according to any one of claims 12 to 21, characterized in that the total effective focal length f of the optical imaging system is half the diagonal length of the effective pixel area on the imaging surface of the optical imaging system ImgH satisfies f/ImgH>4.5.

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