CN210626763U - Optical imaging system - Google Patents

Abstract

The application discloses an optical imaging system, which comprises in order from an object side to an image side along an optical axis: a first lens having a positive refractive power, an object-side surface of which is convex; a second lens having an optical power; a third lens having optical power; the fourth lens with positive focal power has a concave object-side surface and a convex image-side surface; a fifth lens having a negative optical power; an on-axis distance SAG42 from the intersection point of the image-side surface of the fourth lens and the optical axis to the effective radius vertex of the image-side surface of the fourth lens, an on-axis distance SAG51 from the intersection point of the object-side surface of the fifth lens and the optical axis to the effective radius vertex of the object-side surface of the fifth lens, and a distance Tr7r10 from the object-side surface of the fourth lens to the image-side surface of the fifth lens on the optical axis satisfy-1 < (SAG42+ SAG51)/Tr7r10 < -0.3.

Description

Optical imaging system

Technical Field

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

Background

In recent years, with the development of scientific technology, optical imaging systems are becoming more and more important in many fields (such as mobile phone photography, machine vision, security monitoring, medical imaging, automobile driving, etc.). With the development of motion sensing game devices and smart phone camera technologies, the application of Time of Flight (TOF) is becoming more and more popular.

The TOF is a depth information measuring scheme, and the device mainly comprises an infrared light projector and a receiving module, wherein the infrared light projector projects infrared light outwards, and the infrared light is reflected after encountering a measured object and is received by the receiving module. According to the scheme, the time from the emission to the receiving of infrared light is recorded, the depth information of the illuminated object is calculated, and three-dimensional modeling is completed. Compared with the traditional two-dimensional imaging lens, the TOF lens has more advantages in the aspects of face recognition, three-dimensional imaging, somatosensory interaction and the like.

SUMMERY OF THE UTILITY MODEL

The present application provides an optical imaging system, in order from an object side to an image side along an optical axis, comprising: the first lens with positive focal power, its object side can be the convex surface; a second lens having an optical power; a third lens having optical power; the object side surface of the fourth lens with positive focal power can be a concave surface, and the image side surface of the fourth lens can be a convex surface; a fifth lens having a negative optical power.

In one embodiment, the on-axis distance SAG42 from the intersection point of the image-side surface of the fourth lens and the optical axis to the effective radius vertex of the image-side surface of the fourth lens, the on-axis distance SAG51 from the intersection point of the object-side surface of the fifth lens and the optical axis to the effective radius vertex of the object-side surface of the fifth lens, and the distance Tr7r10 from the object-side surface of the fourth lens to the image-side surface of the fifth lens on the optical axis may satisfy-1 < (SAG42+ SAG51)/Tr7r10 < -0.3.

In one embodiment, the total effective focal length f of the optical imaging system, the entrance pupil diameter EPD of the optical imaging system, and the distance TTL on the optical axis from the object-side surface of the first lens to the imaging surface of the optical imaging system may satisfy f × TTL/EPD < 6 mm.

In one embodiment, the effective focal length f4 of the fourth lens and the total effective focal length f of the optical imaging system can satisfy 0.8 < f4/f ≦ 1.5.

In one embodiment, a distance TTL on the optical axis from an object side surface of the first lens to an imaging surface of the optical imaging system may satisfy TTL < 4.5 mm.

In one embodiment, the total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system may satisfy f/EPD < 1.5.

In one embodiment, the effective focal length f1 of the first lens and the total effective focal length f of the optical imaging system can satisfy 1.5 < f1/f < 2.1.

In one embodiment, the radius of curvature R7 of the object side surface of the fourth lens and the total effective focal length f of the optical imaging system can satisfy-0.8 < R7/f < -0.3.

In one embodiment, the maximum distortion DISTmax of the optical imaging system may satisfy DISTmax < 3%.

In one embodiment, a separation distance T12 on the optical axis of the first lens and the second lens, a separation distance T23 on the optical axis of the second lens and the third lens, and a separation distance T34 on the optical axis of the third lens and the fourth lens may satisfy 0.35 < T34/(T12+ T23) < 0.7.

In one embodiment, a distance T45 between the fourth lens and the fifth lens on the optical axis and a distance TD between the object-side surface of the first lens and the image-side surface of the fifth lens on the optical axis may satisfy 10 × T45/TD < 0.5.

In one embodiment, a central thickness CT2 of the second lens on the optical axis and a central thickness CT4 of the fourth lens on the optical axis may satisfy 0.2 < CT2/CT4 < 0.5.

In one embodiment, the central thickness CT2 of the second lens on the optical axis and the edge thickness ET2 of the second lens can satisfy 0.9 < CT2/ET2 < 1.65.

In one embodiment, the effective half aperture DT12 of the image side surface of the first lens and the effective half aperture DT21 of the object side surface of the second lens can satisfy 0.9 < DT12/DT21 < 1.2.

In one embodiment, the effective half aperture DT21 of the object side surface of the second lens and the effective half aperture DT31 of the object side surface of the third lens can satisfy 0.8 < DT21/DT31 < 1.2.

In one embodiment, an on-axis distance from an intersection of an object-side surface of the second lens and the optical axis to an effective radius vertex of the object-side surface of the second lens, SAG21, and a center thickness of the second lens on the optical axis, CT2, may satisfy-0.7 < SAG21/CT2 < 0.

In one embodiment, the on-axis distance from the intersection of the object-side surface of the third lens and the optical axis to the effective radius vertex of the object-side surface of the third lens, SAG31, and the central thickness of the third lens on the optical axis, CT3, may satisfy-0.9 < SAG31/CT3 < -0.2.

In one embodiment, the effective half aperture DT52 of the image side surface of the fifth lens and the half length ImgH of the diagonal line of the effective pixel area on the imaging surface of the optical imaging system can satisfy 0.8 < DT52/ImgH < 1.

This application has adopted five lens, through the focal power of rational distribution each lens, face type, the center thickness of each lens and the epaxial interval between each lens etc for above-mentioned optical imaging system has at least one beneficial effect such as low distortion, hi-lite, miniaturization, large aperture.

Drawings

Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments when taken in conjunction with the accompanying drawings. In the drawings:

fig. 1 shows a schematic configuration diagram of an optical imaging system according to embodiment 1 of the present application; fig. 2A to 2C show an astigmatism curve, a distortion curve, and a relative illuminance curve, respectively, of the optical imaging system of embodiment 1;

fig. 3 shows a schematic configuration diagram of an optical imaging system according to embodiment 2 of the present application; fig. 4A to 4C show an astigmatism curve, a distortion curve, and a relative illuminance curve, respectively, of the optical imaging system of embodiment 2;

fig. 5 shows a schematic configuration diagram of an optical imaging system according to embodiment 3 of the present application; fig. 6A to 6C show an astigmatism curve, a distortion curve, and a relative illuminance curve, respectively, of the optical imaging system of embodiment 3;

fig. 7 shows a schematic configuration diagram of an optical imaging system according to embodiment 4 of the present application; fig. 8A to 8C show an astigmatism curve, a distortion curve, and a relative illuminance curve, respectively, of the optical imaging system of embodiment 4;

fig. 9 shows a schematic configuration diagram of an optical imaging system according to embodiment 5 of the present application; fig. 10A to 10C show an astigmatism curve, a distortion curve, and a relative illuminance curve, respectively, of the optical imaging system of example 5;

fig. 11 shows a schematic configuration diagram of an optical imaging system according to embodiment 6 of the present application; fig. 12A to 12C show an astigmatism curve, a distortion curve, and a relative illuminance curve, respectively, of the optical imaging system of embodiment 6;

fig. 13 is a schematic structural view showing an optical imaging system according to embodiment 7 of the present application; fig. 14A to 14C show an astigmatism curve, a distortion curve, and a relative illuminance curve, respectively, of the optical imaging system of example 7;

fig. 15 shows a schematic configuration diagram of an optical imaging system according to embodiment 8 of the present application; fig. 16A to 16C show an astigmatism curve, a distortion curve, and a relative illuminance curve, respectively, of the optical imaging system of example 8.

Fig. 17 is a schematic structural view showing an optical imaging system according to embodiment 9 of the present application; fig. 18A to 18C show an astigmatism curve, a distortion curve, and a relative illuminance curve, respectively, of the optical imaging system of example 9.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. 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 first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.

Herein, the paraxial region refers to a 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 concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" 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 one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

The features, principles, and other aspects of the present application are described in detail below.

An optical imaging system according to an exemplary embodiment of the present application may include, for example, five lenses having optical powers, i.e., a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The five lenses are arranged in sequence from the object side to the image side along the optical axis. Any adjacent two lenses among the first to fifth lenses may have an air space therebetween.

In an exemplary embodiment, the first lens may have a positive optical power, and the object-side surface thereof may be convex; the second lens has positive focal power or negative focal power; the third lens has positive focal power or negative focal power; the fourth lens can have positive focal power, and the object side surface of the fourth lens can be a concave surface, and the image side surface of the fourth lens can be a convex surface; the fifth lens may have a negative optical power. The low-order aberration of the control system is effectively balanced by reasonably controlling the positive and negative distribution of the focal power of each component of the system and the lens surface curvature.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression-1 < (SAG42+ SAG51)/Tr7r10 < -0.3, where SAG42 is an on-axis distance from an intersection point of an image-side surface of the fourth lens and the optical axis to an effective radius vertex of the image-side surface of the fourth lens, SAG51 is an on-axis distance from an intersection point of an object-side surface of the fifth lens and the optical axis to an effective radius vertex of the object-side surface of the fifth lens, and Tr7r10 is a distance from the object-side surface of the fourth lens to the image-side surface of the fifth lens on the optical axis. More specifically, SAG42, SAG51 and Tr7r10 may satisfy-0.68 < (SAG42+ SAG51)/Tr7r10 < -0.36. Through controlling the rise of the effective radius vertex of the image side surface of the fourth lens, the rise of the effective radius vertex of the object side surface of the fifth lens and the distance from the object side surface of the fourth lens to the image side surface of the fifth lens, the fourth lens and the fifth lens are enabled to have enough space, the surface of the fourth lens and the surface of the fifth lens have high freedom degree change, astigmatism and field curvature of the optical imaging system are favorably corrected better, and the imaging quality of the optical imaging system is improved.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression f × TTL/EPD < 6mm, where f is a total effective focal length of the optical imaging system, EPD is an entrance pupil diameter of the optical imaging system, and TTL is a distance on an optical axis from an object-side surface of the first lens to an imaging plane of the optical imaging system. More specifically, f, EPD and TTL can satisfy 5.0mm < f × TTL/EPD < 5.7 mm. The total effective focal length, the entrance pupil diameter and the total optical length of the optical imaging system are matched, so that the optical imaging system is miniaturized, has a large aperture and further has larger light transmission amount and better relative illumination. The optical imaging system can be used in portable electronic products with small installation space.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.8 < f4/f ≦ 1.5, where f4 is an effective focal length of the fourth lens, and f is a total effective focal length of the optical imaging system. More specifically, f4 and f can satisfy 0.81 < f4/f ≦ 1.5. The ratio of the effective focal length to the total effective focal length of the fourth lens is controlled, so that the light deflection at the fourth lens is avoided being too large, and the field curvature of the optical imaging system is corrected better.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression TTL < 4.5mm, where TTL is a distance on an optical axis from an object side surface of the first lens to an imaging surface of the optical imaging system. More specifically, TTL can satisfy 4mm < TTL < 4.21 mm. By controlling the total optical length of the optical imaging system, miniaturization of the optical imaging system is facilitated.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression f/EPD < 1.5, where f is the total effective focal length of the optical imaging system and EPD is the entrance pupil diameter of the optical imaging system. More specifically, f and EPD may satisfy 1.21 < f/EPD < 1.39. The ratio of the total effective focal length to the entrance pupil diameter of the optical imaging system is controlled, so that the optical imaging system has larger aperture and higher light flux, the imaging effect of the optical imaging system in the working process in a dark environment is further improved, and the aberration of the marginal field of view is favorably reduced.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1.5 < f1/f < 2.1, where f1 is an effective focal length of the first lens, and f is a total effective focal length of the optical imaging system. More specifically, f1 and f can satisfy 1.53 < f1/f < 2.03. The ratio of the effective focal length of the first lens to the total effective focal length is controlled, so that chromatic aberration of the optical imaging system is improved, the focusing position of light is adjusted, and the light converging capability of the optical imaging system is improved.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression-0.8 < R7/f < -0.3, where R7 is a radius of curvature of an object-side surface of the fourth lens, and f is an overall effective focal length of the optical imaging system. More specifically, R7 and f satisfy-0.65 < R7/f < -0.45. By controlling the ratio of the curvature radius of the object measuring surface of the fourth lens to the total effective focal length, the matching of the light angle of the imaging surface of the optical imaging system and the Chief Ray Angle (CRA) of the photosensitive chip is facilitated, and the imaging quality of the optical imaging system is further improved.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression DISTmax < 3%, where DISTmax is the maximum distortion of the optical imaging system. More specifically, DISTmax may satisfy DISTmax < 2.6%. By controlling the distortion of the optical imaging system, the astigmatism of the optical imaging system is favorably reduced, the relative illumination is favorably improved, and the imaging quality of the optical imaging system is favorably improved.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.35 < T34/(T12+ T23) < 0.7, where T12 is a separation distance of the first lens and the second lens on the optical axis, T23 is a separation distance of the second lens and the third lens on the optical axis, and T34 is a separation distance of the third lens and the fourth lens on the optical axis. More specifically, T12, T23, and T34 may satisfy 0.36 < T34/(T12+ T23) < 0.66. By controlling the air space between the adjacent lenses in the first lens to the fourth lens, the total optical length of the optical imaging system can be effectively controlled, and the optical imaging system is favorably miniaturized.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 10 × T45/TD < 0.5, where T45 is an interval distance between the fourth lens and the fifth lens on the optical axis, and TD is an interval distance between an object-side surface of the first lens and an image-side surface of the fifth lens on the optical axis. More specifically, T45 and TD satisfy 0.09 < 10 XT 45/TD < 0.45. The ratio of the on-axis distance of the fourth lens and the fifth lens to the on-axis distance of the object side surface of the first lens to the image side surface of the fifth lens is controlled, so that the total length of the optical imaging system is favorably shortened, the optical imaging system has the light and thin characteristic, the structure of the optical imaging system is also adjusted, and the processing difficulty and the assembling difficulty of each lens are favorably reduced.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.2 < CT2/CT4 < 0.5, where CT2 is a central thickness of the second lens on the optical axis and CT4 is a central thickness of the fourth lens on the optical axis. More specifically, CT2 and CT4 satisfy 0.26 < CT2/CT4 < 0.42. By controlling the ratio of the central thickness of the second lens to the central thickness of the fourth lens, the sufficient space between the lenses of the optical imaging system is favorably provided, so that the surfaces of the lenses have higher freedom degree, and the curvature of field and astigmatism of the optical imaging system are favorably and better corrected.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.9 < CT2/ET2 < 1.65, where CT2 is a central thickness of the second lens on the optical axis and ET2 is an edge thickness of the second lens. More specifically, CT2 and ET2 satisfy 0.93 < CT2/ET2 < 1.64. The ratio of the center thickness and the edge thickness of the second lens is controlled, so that the processing difficulty and the assembling difficulty of the second lens are reduced.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.9 < DT12/DT21 < 1.2, where DT12 is an effective half aperture of an image side surface of the first lens and DT21 is an effective half aperture of an object side surface of the second lens. More specifically, DT12 and DT21 satisfy 0.95 < DT12/DT21 < 1.15. The effective half aperture of the image side surface of the first lens is matched with the effective half aperture of the object side surface of the second lens, so that the off-axis aberration of the optical imaging system can be better corrected, and the optical imaging system has higher image quality.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.8 < DT21/DT31 < 1.2, where DT21 is an effective half aperture of an object side surface of the second lens and DT31 is an effective half aperture of an object side surface of the third lens. More specifically, DT21 and DT31 may satisfy 0.85 < DT21/DT31 < 1.08. The effective half aperture of the object side surface of the second lens is matched with the effective half aperture of the object side surface of the third lens, so that the assembly difficulty of the second lens and the third lens is favorably reduced, and the optical imaging system has smaller aberration.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression-0.7 < SAG21/CT2 < 0, where SAG21 is an on-axis distance from an intersection of an object-side surface of the second lens and the optical axis to an effective radius vertex of the object-side surface of the second lens, and CT2 is a center thickness of the second lens on the optical axis. More specifically, SAG21 and CT2 satisfy-0.7 < SAG21/CT2 < -0.1. By controlling the ratio of the rise of the effective radius vertex of the object side surface of the second lens to the center thickness of the second lens, the relative brightness of the optical imaging system can be effectively improved.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression-0.9 < SAG31/CT3 < -0.2, where SAG31 is an on-axis distance from an intersection of an object-side surface of the third lens and the optical axis to an effective radius vertex of the object-side surface of the third lens, and CT3 is a center thickness of the third lens on the optical axis. More specifically, SAG31 and CT3 satisfy-0.89 < SAG31/CT3 < -0.41. By controlling the ratio of the rise of the effective radius vertex of the object side surface of the third lens to the center thickness of the third lens, the chief ray angle of the optical imaging system can be effectively adjusted, and the imaging quality of the optical imaging system is favorably improved.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.8 < DT52/ImgH < 1, where DT52 is an effective half aperture of an image side surface of the fifth lens, and ImgH is a half of a diagonal length of an effective pixel area on an imaging surface of the optical imaging system. More specifically, DT52 and ImgH may satisfy 0.87 < DT52/ImgH < 0.93. The ratio of the effective half aperture of the object side surface of the fifth lens to the image height is controlled, so that the optical imaging system has good capability of balancing aberration.

In an exemplary embodiment, the optical imaging system may further include at least one diaphragm. The stop may be disposed at an appropriate position as needed, for example, between the object side and the first lens. Optionally, the optical imaging system may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element on the imaging surface.

The optical imaging system according to the above-described embodiment of the present application may employ a plurality of lenses, for example, five lenses as described above. By reasonably distributing the focal power, the surface type, the central thickness of each lens, the on-axis distance between each lens and the like, the volume of the imaging system can be effectively reduced, the sensitivity of the imaging system can be reduced, and the processability of the imaging system can be improved, so that the optical imaging system is more favorable for production and processing and can be suitable for portable electronic products. Meanwhile, the optical imaging system further has the characteristics of low distortion, high brightness, large aperture and other excellent optical performances, miniaturization, lightness and thinness. The optical imaging system can be applied to infrared band and TOF technology, and can provide better imaging effect in aspects such as face recognition, stereo imaging, somatosensory interaction and the like.

In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the object-side surface of the first lens to the image-side surface of the fifth lens is an aspherical mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of an object-side surface and an image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens is an aspheric mirror surface. Optionally, each of the first, second, third, fourth, and fifth lenses has an object-side surface and an image-side surface that are aspheric mirror surfaces.

However, it will be appreciated by those skilled in the art that the number of lenses constituting the optical imaging system may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although five lenses are exemplified in the embodiment, the optical imaging system is not limited to include five lenses. The optical imaging system may also include other numbers of lenses, if desired.

Specific examples of the optical imaging system that can be applied to the above-described embodiments are further described below with reference to the drawings.

Example 1

An optical imaging system according to embodiment 1 of the present application is described below with reference to fig. 1 to 2C. Fig. 1 shows a schematic configuration diagram of an optical imaging system according to embodiment 1 of the present application.

As shown in fig. 1, the optical imaging system, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter L6.

The first lens element L1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element L2 has negative power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element L3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element L4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element L5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. Filter L6 has an object side S11 and an image side S12. The optical imaging system has an imaging plane S13, and light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging plane S13.

Table 1 shows a basic parameter table of the optical imaging system of example 1, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).

TABLE 1

In embodiment 1, the value of the total effective focal length f of the optical imaging system is 2.54mm, and the value of the on-axis distance TTL from the object side face S1 to the imaging face S13 of the first lens L1 is 4.06 mm.

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens L1 through the fifth lens L5 are aspheric surfaces, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric surface formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the high-order term coefficients A that can be used for the aspherical mirror surfaces S1 to S10 in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

4.4473E-02

-3.1426E-01

2.5283E+00

-1.1557E+01

3.1356E+01

-5.1886E+01

5.1156E+01

-2.7614E+01

6.2691E+00

S2

2.1374E-02

5.4529E-01

-4.7141E+00

1.8564E+01

-4.4004E+01

6.3926E+01

-5.5909E+01

2.7103E+01

-5.6024E+00

S3

-9.2178E-02

5.2659E-01

-3.8330E+00

1.4834E+01

-3.4267E+01

4.7966E+01

-3.9401E+01

1.7434E+01

-3.2020E+00

S4

-6.1528E-02

-3.3140E-01

1.3818E+00

-3.0617E+00

3.1364E+00

-3.8090E-01

-1.6234E+00

9.1151E-01

-7.0614E-02

S5

-2.3438E-01

8.0369E-01

-5.7540E+00

2.0011E+01

-4.3381E+01

5.7879E+01

-4.6540E+01

2.0959E+01

-4.0656E+00

S6

-1.0462E-01

-1.0184E-01

3.3624E-01

-2.4924E+00

7.6637E+00

-1.2941E+01

1.2746E+01

-6.6665E+00

1.4141E+00

S7

1.6606E-01

-3.9444E-01

5.8771E-01

2.5262E-01

-2.9280E+00

6.0086E+00

-5.7571E+00

2.6961E+00

-5.0242E-01

S8

6.4442E-02

-3.7366E-01

7.8553E-01

-1.1443E+00

1.1185E+00

-6.4441E-01

1.7353E-01

-1.3786E-03

-6.0262E-03

S9

-2.1409E-01

-3.9701E-03

1.8514E-01

-2.8377E-01

2.3472E-01

-1.1870E-01

3.6618E-02

-6.3049E-03

4.6238E-04

S10

-8.3102E-02

5.2644E-02

-2.9775E-02

8.5152E-03

3.6063E-04

-1.0498E-03

2.9357E-04

-3.0251E-05

6.9955E-07

TABLE 2

Fig. 2A shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 1. Fig. 2B shows a distortion curve of the optical imaging system of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 2C shows a relative illuminance curve of the optical imaging system of embodiment 1, which represents the relative illuminance corresponding to different image heights on the imaging surface. As can be seen from fig. 2A to 2C, the optical imaging system according to embodiment 1 can achieve good imaging quality.

Example 2

An optical imaging system according to embodiment 2 of the present application is described below with reference to fig. 3 to 4C. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. 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, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter L6.

The first lens element L1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element L2 has positive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element L3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element L4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element L5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. Filter L6 has an object side S11 and an image side S12. The optical imaging system has an imaging plane S13, and light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging plane S13.

In embodiment 2, the value of the total effective focal length f of the optical imaging system is 2.60mm, and the value of the on-axis distance TTL from the object side face S1 to the imaging face S13 of the first lens L1 is 4.20 mm.

Table 3 shows a basic parameter table of the optical imaging system of example 2, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 4 shows high-order term coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 3

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

3.6690E-02

-1.9950E-01

1.5932E+00

-7.2355E+00

1.9517E+01

-3.2229E+01

3.1771E+01

-1.7181E+01

3.9112E+00

S2

2.0062E-02

5.1289E-01

-4.4304E+00

1.7372E+01

-4.0978E+01

5.9363E+01

-5.1866E+01

2.5123E+01

-5.1818E+00

S3

-1.0532E-01

5.0246E-01

-3.5704E+00

1.3503E+01

-3.0322E+01

4.1126E+01

-3.2543E+01

1.3753E+01

-2.3873E+00

S4

-4.6663E-02

-3.2859E-01

1.2859E+00

-2.7585E+00

2.7354E+00

-2.3251E-01

-1.4786E+00

7.8063E-01

-4.9992E-02

S5

-2.3931E-01

7.7869E-01

-5.6314E+00

1.9731E+01

-4.2992E+01

5.7650E+01

-4.6671E+01

2.1225E+01

-4.1772E+00

S6

-1.5013E-01

3.9380E-01

-2.6207E+00

8.2488E+00

-1.5834E+01

1.8397E+01

-1.2232E+01

4.2604E+00

-6.0171E-01

S7

1.5669E-01

-2.3563E-02

-1.4311E+00

6.7565E+00

-1.5859E+01

2.1575E+01

-1.6782E+01

6.9193E+00

-1.1759E+00

S8

2.5291E-02

-1.2275E-01

-5.3661E-02

6.1437E-01

-1.2135E+00

1.2690E+00

-7.5993E-01

2.4534E-01

-3.3096E-02

S9

-1.9955E-01

1.1378E-02

1.2383E-01

-1.9082E-01

1.5140E-01

-7.1516E-02

2.0090E-02

-3.0699E-03

1.9335E-04

S10

-7.6999E-02

4.8611E-02

-2.8744E-02

8.4978E-03

3.3614E-04

-1.0544E-03

2.9296E-04

-3.0220E-05

7.3266E-07

TABLE 4

Fig. 4A shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 2. Fig. 4B shows a distortion curve of the optical imaging system of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 4C shows a relative illuminance curve of the optical imaging system of embodiment 2, which represents the relative illuminance corresponding to different image heights on the imaging plane. As can be seen from fig. 4A to 4C, the optical imaging system according to embodiment 2 can achieve good imaging quality.

Example 3

An optical imaging system according to embodiment 3 of the present application is described below with reference to fig. 5 to 6C. 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, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter L6.

The first lens element L1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element L2 has positive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element L3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element L4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element L5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. Filter L6 has an object side S11 and an image side S12. The optical imaging system has an imaging plane S13, and light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging plane S13.

In embodiment 3, the value of the total effective focal length f of the optical imaging system is 2.61mm, and the value of the on-axis distance TTL from the object side face S1 to the imaging face S13 of the first lens L1 is 4.16 mm.

Table 5 shows a basic parameter table of the optical imaging system of example 3, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 6 shows high-order term coefficients that can be used for each aspherical mirror surface in example 3, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 5

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

4.6093E-02

-3.5419E-01

2.7798E+00

-1.2273E+01

3.2231E+01

-5.1857E+01

4.9969E+01

-2.6485E+01

5.9290E+00

S2

3.1317E-02

4.1884E-01

-3.9624E+00

1.5848E+01

-3.7915E+01

5.5455E+01

-4.8689E+01

2.3594E+01

-4.8455E+00

S3

-9.4165E-02

4.7996E-01

-3.5372E+00

1.3487E+01

-3.0709E+01

4.2412E+01

-3.4334E+01

1.4964E+01

-2.7176E+00

S4

-3.7674E-02

-2.8190E-01

1.0834E+00

-2.3241E+00

2.1304E+00

3.9024E-01

-1.9988E+00

1.1038E+00

-1.4483E-01

S5

-2.6254E-01

7.8284E-01

-5.8167E+00

2.0991E+01

-4.6874E+01

6.4397E+01

-5.3592E+01

2.5185E+01

-5.1504E+00

S6

-1.5646E-01

4.0423E-01

-1.8217E+00

4.0887E+00

-5.2753E+00

3.3384E+00

-1.5279E-01

-8.4598E-01

2.8896E-01

S7

4.9181E-02

3.7281E-01

-2.6160E+00

8.4178E+00

-1.5766E+01

1.7873E+01

-1.1879E+01

4.2470E+00

-6.3130E-01

S8

3.1757E-02

-1.4795E-01

-1.1409E-01

9.0013E-01

-1.7498E+00

1.8266E+00

-1.0823E+00

3.4403E-01

-4.5953E-02

S9

-1.7593E-01

-1.9445E-02

1.7443E-01

-2.3495E-01

1.7604E-01

-8.0747E-02

2.2412E-02

-3.4516E-03

2.2602E-04

S10

-7.2011E-02

5.0193E-02

-2.8958E-02

8.5451E-03

3.4313E-04

-1.0539E-03

2.9278E-04

-3.0322E-05

7.5774E-07

TABLE 6

Fig. 6A shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 3. Fig. 6B shows a distortion curve of the optical imaging system of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 6C shows a relative illuminance curve of the optical imaging system of embodiment 3, which represents the relative illuminance corresponding to different image heights on the imaging plane. As can be seen from fig. 6A to 6C, the optical imaging system according to embodiment 3 can achieve good imaging quality.

Example 4

An optical imaging system according to embodiment 4 of the present application is described below with reference to fig. 7 to 8C. Fig. 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, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter L6.

The first lens element L1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element L2 has negative power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element L3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element L4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element L5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. Filter L6 has an object side S11 and an image side S12. The optical imaging system has an imaging plane S13, and light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging plane S13.

In embodiment 4, the value of the total effective focal length f of the optical imaging system is 2.33mm, and the value of the on-axis distance TTL from the object side face S1 to the imaging face S13 of the first lens L1 is 4.18 mm.

Table 7 shows a basic parameter table of the optical imaging system of example 4 in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 8 shows high-order term coefficients that can be used for each aspherical mirror surface in example 4, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 7

TABLE 8

Fig. 8A shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 4. Fig. 8B shows a distortion curve of the optical imaging system of embodiment 4, which represents distortion magnitude values corresponding to different image heights. Fig. 8C shows a relative illuminance curve of the optical imaging system of embodiment 4, which represents the relative illuminance corresponding to different image heights on the imaging plane. As can be seen from fig. 8A to 8C, the optical imaging system according to embodiment 4 can achieve good imaging quality.

Example 5

An optical imaging system according to embodiment 5 of the present application is described below with reference to fig. 9 to 10C. Fig. 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, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter L6.

The first lens element L1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element L2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element L3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element L4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element L5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. Filter L6 has an object side S11 and an image side S12. The optical imaging system has an imaging plane S13, and light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging plane S13.

In embodiment 5, the value of the total effective focal length f of the optical imaging system is 2.35mm, and the value of the on-axis distance TTL from the object side face S1 to the imaging face S13 of the first lens L1 is 3.99 mm.

Table 9 shows a basic parameter table of the optical imaging system of example 5 in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 10 shows high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 9

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

6.9851E-02

-7.0479E-01

5.7686E+00

-2.7470E+01

7.9015E+01

-1.4017E+02

1.4942E+02

-8.7733E+01

2.1779E+01

S2

3.7716E-02

5.0394E-01

-5.0649E+00

2.1123E+01

-5.1587E+01

7.5244E+01

-6.4472E+01

2.9909E+01

-5.7657E+00

S3

-1.2362E-01

7.9240E-01

-5.9320E+00

2.5578E+01

-6.6270E+01

1.0354E+02

-9.5116E+01

4.7314E+01

-9.8188E+00

S4

-5.5454E-02

-8.3256E-01

5.9608E+00

-2.3680E+01

5.7470E+01

-8.7820E+01

8.3109E+01

-4.4712E+01

1.0459E+01

S5

-2.2886E-01

9.3304E-01

-8.0095E+00

3.2577E+01

-8.1555E+01

1.2632E+02

-1.1843E+02

6.1718E+01

-1.3653E+01

S6

-1.2989E-01

4.0960E-01

-3.4247E+00

1.1639E+01

-2.4001E+01

3.0829E+01

-2.3558E+01

9.8144E+00

-1.7237E+00

S7

1.9227E-01

-3.0555E-01

-1.4794E-01

2.1951E+00

-6.1837E+00

9.9330E+00

-8.9361E+00

4.1665E+00

-7.8627E-01

S8

7.3110E-02

-3.9518E-01

8.7593E-01

-1.3922E+00

1.4837E+00

-9.9229E-01

3.9087E-01

-8.1132E-02

6.7247E-03

S9

-2.0159E-01

-2.7562E-02

2.0459E-01

-2.9431E-01

2.3511E-01

-1.1527E-01

3.4234E-02

-5.6078E-03

3.8490E-04

S10

-7.9671E-02

4.9427E-02

-2.9175E-02

8.5525E-03

3.4531E-04

-1.0553E-03

2.9250E-04

-3.0323E-05

7.5544E-07

Watch 10

Fig. 10A shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of example 5. Fig. 10B shows a distortion curve of the optical imaging system of embodiment 5, which represents distortion magnitude values corresponding to different image heights. Fig. 10C shows a relative illuminance curve of the optical imaging system of example 5, which represents the relative illuminance corresponding to different image heights on the imaging plane. As can be seen from fig. 10A to 10C, the optical imaging system according to embodiment 5 can achieve good imaging quality.

Example 6

An optical imaging system according to embodiment 6 of the present application is described below with reference to fig. 11 to 12C. Fig. 11 shows a schematic configuration diagram of an optical imaging system according to embodiment 6 of the present application.

As shown in fig. 11, the optical imaging system, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter L6.

The first lens element L1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens L2 has negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens element L3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element L4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element L5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. Filter L6 has an object side S11 and an image side S12. The optical imaging system has an imaging plane S13, and light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging plane S13.

In embodiment 6, the value of the total effective focal length f of the optical imaging system is 2.50mm, and the value of the on-axis distance TTL from the object side face S1 to the imaging face S13 of the first lens L1 is 4.04 mm.

Table 11 shows a basic parameter table of the optical imaging system of example 6 in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 12 shows high-order term coefficients that can be used for each aspherical mirror surface in example 6, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 11

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

4.1061E-02

-2.5621E-01

2.0239E+00

-9.2190E+00

2.4631E+01

-3.9996E+01

3.8618E+01

-2.0412E+01

4.5424E+00

S2

3.4697E-02

3.7156E-01

-3.6748E+00

1.4138E+01

-3.2089E+01

4.4005E+01

-3.5894E+01

1.6097E+01

-3.0656E+00

S3

-9.1559E-02

5.7087E-01

-3.9621E+00

1.5382E+01

-3.6080E+01

5.1473E+01

-4.3229E+01

1.9637E+01

-3.7242E+00

S4

-9.1800E-02

-2.5479E-01

1.1683E+00

-2.5535E+00

2.3456E+00

3.3636E-01

-2.0111E+00

1.0673E+00

-1.1254E-01

S5

-2.1010E-01

7.2648E-01

-5.1208E+00

1.7308E+01

-3.6495E+01

4.7308E+01

-3.6874E+01

1.6054E+01

-3.0034E+00

S6

-9.6868E-02

4.3989E-02

-2.8715E-01

-8.7429E-01

4.6909E+00

-9.1605E+00

9.5739E+00

-5.1298E+00

1.0976E+00

S7

1.8734E-01

-6.0262E-01

1.7435E+00

-3.6337E+00

4.9597E+00

-3.9132E+00

1.7862E+00

-4.7044E-01

6.1436E-02

S8

9.5921E-02

-5.9518E-01

1.6396E+00

-3.1203E+00

3.9182E+00

-3.1119E+00

1.4979E+00

-3.9840E-01

4.4999E-02

S9

-2.3376E-01

-3.6319E-03

2.0139E-01

-3.1532E-01

2.6587E-01

-1.3716E-01

4.3294E-02

-7.6447E-03

5.7547E-04

S10

-9.1279E-02

5.5566E-02

-3.0332E-02

8.4819E-03

3.7151E-04

-1.0438E-03

2.9525E-04

-3.0123E-05

5.4678E-07

TABLE 12

Fig. 12A shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of example 6. Fig. 12B shows a distortion curve of the optical imaging system of embodiment 6, which represents distortion magnitude values corresponding to different image heights. Fig. 12C shows a relative illuminance curve of the optical imaging system of example 6, which represents the relative illuminance corresponding to different image heights on the imaging plane. As can be seen from fig. 12A to 12C, the optical imaging system according to embodiment 6 can achieve good imaging quality.

Example 7

An optical imaging system according to embodiment 7 of the present application is described below with reference to fig. 13 to 14C. Fig. 13 shows a schematic configuration diagram of an optical imaging system according to embodiment 7 of the present application.

As shown in fig. 13, the optical imaging system, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter L6.

The first lens element L1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element L2 has negative power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element L3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element L4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element L5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. Filter L6 has an object side S11 and an image side S12. The optical imaging system has an imaging plane S13, and light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging plane S13.

In embodiment 7, the value of the total effective focal length f of the optical imaging system is 2.34mm, and the value of the on-axis distance TTL from the object side face S1 to the imaging face S13 of the first lens L1 is 4.01 mm.

Table 13 shows a basic parameter table of the optical imaging system of example 7 in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 14 shows high-order term coefficients that can be used for each aspherical mirror surface in example 7, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

Watch 13

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

6.3810E-02

-5.0186E-01

3.5583E+00

-1.4580E+01

3.6168E+01

-5.5496E+01

5.1257E+01

-2.6133E+01

5.6023E+00

S2

-1.4946E-02

7.4954E-01

-6.0460E+00

2.4772E+01

-6.2402E+01

9.7506E+01

-9.2512E+01

4.8816E+01

-1.0977E+01

S3

-1.1762E-01

4.7711E-01

-3.1673E+00

1.1841E+01

-2.7009E+01

3.7582E+01

-3.0880E+01

1.3819E+01

-2.6132E+00

S4

-5.0663E-02

-3.2597E-01

1.3805E+00

-3.1322E+00

3.2243E+00

-2.7714E-01

-1.9131E+00

1.0957E+00

-1.0438E-01

S5

-2.2851E-01

7.6642E-01

-5.4522E+00

1.8755E+01

-4.0152E+01

5.2860E+01

-4.1921E+01

1.8621E+01

-3.5669E+00

S6

-1.5510E-01

4.4468E-01

-2.4518E+00

6.5114E+00

-1.0924E+01

1.1610E+01

-7.2558E+00

2.4170E+00

-3.3342E-01

S7

1.0469E-01

2.6204E-01

-2.2898E+00

7.4549E+00

-1.4360E+01

1.7630E+01

-1.3058E+01

5.2637E+00

-8.8508E-01

S8

5.0380E-02

-3.1717E-01

7.2094E-01

-1.2259E+00

1.4376E+00

-1.0797E+00

4.9284E-01

-1.2428E-01

1.3290E-02

S9

-1.7869E-01

-1.3746E-02

7.2001E-02

-4.1776E-02

-2.0072E-02

3.9738E-02

-2.2380E-02

5.8335E-03

-6.0026E-04

S10

-8.7415E-02

4.9909E-02

-2.8851E-02

8.5420E-03

3.2987E-04

-1.0571E-03

2.9255E-04

-3.0379E-05

7.4919E-07

TABLE 14

Fig. 14A shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of example 7. Fig. 14B shows a distortion curve of the optical imaging system of embodiment 7, which represents distortion magnitude values corresponding to different image heights. Fig. 14C shows a relative illuminance curve of the optical imaging system of example 7, which represents the relative illuminance corresponding to different image heights on the imaging plane. As can be seen from fig. 14A to 14C, the optical imaging system according to embodiment 7 can achieve good imaging quality.

Example 8

An optical imaging system according to embodiment 8 of the present application is described below with reference to fig. 15 to 16C. Fig. 15 shows a schematic structural view of an optical imaging system according to embodiment 8 of the present application.

As shown in fig. 15, the optical imaging system, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter L6.

The first lens element L1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element L2 has negative power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element L3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element L4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element L5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. Filter L6 has an object side S11 and an image side S12. The optical imaging system has an imaging plane S13, and light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging plane S13.

In embodiment 8, the value of the total effective focal length f of the optical imaging system is 2.44mm, and the value of the on-axis distance TTL from the object side face S1 to the imaging face S13 of the first lens L1 is 3.90 mm.

Table 15 shows a basic parameter table of the optical imaging system of example 8 in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 16 shows high-order term coefficients that can be used for each aspherical mirror surface in example 8, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

Watch 15

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

4.1807E-02

-1.7420E-01

1.4739E+00

-7.9201E+00

2.4550E+01

-4.6021E+01

5.0992E+01

-3.0801E+01

7.8096E+00

S2

8.3557E-02

-1.0861E-01

-8.8599E-01

3.9136E+00

-9.0083E+00

1.1649E+01

-8.4240E+00

3.1614E+00

-4.7336E-01

S3

-8.8237E-02

2.8567E-01

-1.8629E+00

6.6710E+00

-1.4156E+01

1.7163E+01

-1.0355E+01

1.9415E+00

3.6647E-01

S4

-1.0270E-01

-3.1769E-01

2.2082E+00

-8.1708E+00

1.8599E+01

-2.7081E+01

2.5023E+01

-1.3444E+01

3.1745E+00

S5

-1.9392E-01

2.6257E-01

-1.7946E+00

3.2506E+00

-2.2397E-01

-1.0697E+01

1.8981E+01

-1.3501E+01

3.6013E+00

S6

-8.9316E-02

-1.0940E-01

2.3223E-02

-8.2737E-01

3.3257E+00

-6.4237E+00

7.0423E+00

-3.9764E+00

8.8828E-01

S7

1.8882E-01

-4.2578E-01

6.5587E-01

-2.9415E-01

-1.1617E+00

3.1387E+00

-3.1921E+00

1.4851E+00

-2.6454E-01

S8

3.6555E-02

-1.6761E-01

-1.2263E-01

1.0845E+00

-2.2584E+00

2.5792E+00

-1.7006E+00

6.0135E-01

-8.7623E-02

S9

-2.4852E-01

2.5324E-02

1.3625E-01

-2.2415E-01

1.9181E-01

-1.0287E-01

3.4777E-02

-6.6921E-03

5.5184E-04

S10

-9.1897E-02

5.6253E-02

-3.0310E-02

8.4717E-03

3.6420E-04

-1.0467E-03

2.9426E-04

-3.0191E-05

6.7302E-07

TABLE 16

Fig. 16A shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of example 8. Fig. 16B shows a distortion curve of the optical imaging system of embodiment 8, which represents distortion magnitude values corresponding to different image heights. Fig. 16C shows a relative illuminance curve of the optical imaging system of example 8, which represents the relative illuminance corresponding to different image heights on the imaging plane. As can be seen from fig. 16A to 16C, the optical imaging system according to embodiment 8 can achieve good imaging quality.

Example 9

An optical imaging system according to embodiment 9 of the present application is described below with reference to fig. 17 to 18C. Fig. 17 shows a schematic configuration diagram of an optical imaging system according to embodiment 9 of the present application.

As shown in fig. 17, the optical imaging system, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter L6.

The first lens element L1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element L2 has negative power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element L3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element L4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens L5 has negative power, and has a concave object-side surface S9 and a concave image-side surface S10. Filter L6 has an object side S11 and an image side S12. The optical imaging system has an imaging plane S13, and light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging plane S13.

In embodiment 9, the value of the total effective focal length f of the optical imaging system is 2.72mm, and the value of the on-axis distance TTL from the object side face S1 to the imaging face S13 of the first lens L1 is 4.10 mm.

Table 17 shows a basic parameter table of the optical imaging system of example 9 in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 18 shows high-order term coefficients that can be used for each aspherical mirror surface in example 9, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 17

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

3.3515E-02

-1.3496E-01

1.0344E+00

-4.6665E+00

1.2295E+01

-1.9793E+01

1.9021E+01

-1.0053E+01

2.2464E+00

S2

6.8748E-02

1.0533E-02

-1.2830E+00

5.0304E+00

-1.1148E+01

1.4362E+01

-1.0541E+01

4.0465E+00

-6.1154E-01

S3

-6.5808E-02

1.4124E-01

-1.1196E+00

4.2754E+00

-9.6897E+00

1.2754E+01

-8.8351E+00

2.6353E+00

-1.2329E-01

S4

-8.7968E-02

-1.8733E-01

8.4501E-01

-2.0418E+00

2.5427E+00

-1.4413E+00

4.8103E-01

-4.7206E-01

2.5968E-01

S5

-1.8425E-01

1.1686E-01

-1.1895E+00

2.7016E+00

-3.3127E+00

5.5505E-02

4.1848E+00

-3.6948E+00

1.0036E+00

S6

-1.1945E-01

2.4789E-02

-1.4415E-01

-9.3056E-01

3.9794E+00

-7.2512E+00

7.3398E+00

-3.8651E+00

8.1989E-01

S7

4.5695E-02

5.0535E-02

-5.1097E-02

-1.0897E-01

2.1916E-01

3.5354E-01

-7.3176E-01

4.2109E-01

-8.0765E-02

S8

2.6163E-01

-1.3026E+00

3.2006E+00

-5.3286E+00

6.0371E+00

-4.4150E+00

1.9473E+00

-4.6057E-01

4.3406E-02

S9

3.7527E-01

-1.3561E+00

2.5635E+00

-3.2508E+00

2.7666E+00

-1.5504E+00

5.4698E-01

-1.0963E-01

9.4761E-03

S10

-9.1244E-02

5.7211E-02

-3.0159E-02

8.4017E-03

3.5135E-04

-1.0458E-03

2.9475E-04

-3.0063E-05

6.2041E-07

Watch 18

Fig. 18A shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of example 9. Fig. 18B shows a distortion curve of the optical imaging system of embodiment 9, which represents distortion magnitude values corresponding to different image heights. Fig. 18C shows a relative illuminance curve of the optical imaging system of example 9, which represents the relative illuminance corresponding to different image heights on the imaging plane. As can be seen from fig. 18A to 18C, the optical imaging system according to embodiment 9 can achieve good imaging quality.

In summary, examples 1 to 9 each satisfy the relationship shown in table 19.

Conditional expression (A) example	1	2	3	4	5	6	7	8	9
										(SAG42+SAG51)/Tr7r10	-0.46	-0.45	-0.39	-0.49	-0.48	-0.50	-0.47	-0.49	-0.66
f×TTL/EPD(mm)	5.25	5.54	5.53	5.37	5.08	5.09	5.23	5.11	5.66
										f4/f	1.22	1.24	1.00	1.34	1.33	1.30	1.50	1.25	0.83
TTL(mm)	4.06	4.20	4.16	4.18	3.99	4.04	4.01	3.90	4.10
										f/EPD	1.29	1.32	1.33	1.28	1.27	1.26	1.30	1.31	1.38
f1/f	1.68	1.65	1.63	1.92	2.01	1.73	1.88	1.77	1.55
										R7/f	-0.51	-0.51	-0.63	-0.56	-0.55	-0.51	-0.54	-0.55	-0.48
DISTmax(％)	2.37	2.46	2.54	2.56	2.49	2.50	2.50	2.45	2.49
										T34/(T12+T23)	0.47	0.37	0.46	0.45	0.56	0.65	0.46	0.53	0.58
10×T45/TD	0.10	0.10	0.10	0.10	0.10	0.10	0.10	0.10	0.42
										CT2/CT4	0.30	0.28	0.32	0.28	0.28	0.31	0.28	0.33	0.41
CT2/ET2	0.94	1.41	1.63	1.32	1.37	1.05	1.48	1.17	1.19
										DT12/DT21	1.13	1.00	0.99	1.00	0.98	1.00	0.99	1.00	1.00
DT21/DT31	0.87	1.00	1.02	1.05	1.01	0.99	0.97	1.02	1.06
										SAG21/CT2	-0.42	-0.56	-0.56	-0.44	-0.14	-0.45	-0.69	-0.46	-0.45
SAG31/CT3	-0.75	-0.87	-0.89	-0.27	-0.72	-0.54	-0.88	-0.51	-0.42
										DT52/ImgH	0.90	0.91	0.92	0.90	0.90	0.88	0.91	0.88	0.88

Watch 19

The present application also provides an imaging device provided with an electron photosensitive element to image, which may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be 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 a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of protection covered by the present application is not limited to the embodiments with a specific combination of the features described above, but also covers other embodiments with any combination of the features described above or their equivalents without departing from the scope of the present application. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (33)

1. The optical imaging system, in order from an object side to an image side along an optical axis, comprises:

a first lens having a positive refractive power, an object-side surface of which is convex;

a second lens having an optical power;

a third lens having optical power;

the fourth lens with positive focal power has a concave object-side surface and a convex image-side surface;

a fifth lens having a negative optical power;

an on-axis distance SAG42 from an intersection point of an image-side surface of the fourth lens and the optical axis to an effective radius vertex of an image-side surface of the fourth lens, an on-axis distance SAG51 from an intersection point of an object-side surface of the fifth lens and the optical axis to an effective radius vertex of an object-side surface of the fifth lens, and a distance Tr7r10 from an object-side surface of the fourth lens to an image-side surface of the fifth lens on the optical axis satisfy-1 < (SAG42+ SAG51)/Tr7r10 < -0.3.

2. The optical imaging system of claim 1, wherein a total effective focal length f of the optical imaging system, an entrance pupil diameter EPD of the optical imaging system, and a distance TTL on the optical axis from an object side surface of the first lens to an imaging surface of the optical imaging system satisfy f x TTL/EPD < 6 mm.

3. The optical imaging system of claim 1, wherein the effective focal length f4 of the fourth lens and the total effective focal length f of the optical imaging system satisfy 0.8 < f4/f ≦ 1.5.

4. The optical imaging system of claim 1, wherein TTL satisfies TTL < 4.5mm on the optical axis from an object side surface of the first lens element to an imaging surface of the optical imaging system.

5. The optical imaging system of claim 1, wherein the total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy f/EPD < 1.5.

6. The optical imaging system of claim 1, wherein the effective focal length f1 of the first lens and the total effective focal length f of the optical imaging system satisfy 1.5 < f1/f < 2.1.

7. The optical imaging system of claim 1, wherein a radius of curvature R7 of an object-side surface of the fourth lens and a total effective focal length f of the optical imaging system satisfy-0.8 < R7/f < -0.3.

8. The optical imaging system of claim 1, wherein a maximum distortion of the optical imaging system, DISTmax, satisfies DISTmax < 3%.

9. The optical imaging system according to claim 1, wherein a separation distance T12 on the optical axis of the first lens and the second lens, a separation distance T23 on the optical axis of the second lens and the third lens, and a separation distance T34 on the optical axis of the third lens and the fourth lens satisfy 0.35 < T34/(T12+ T23) < 0.7.

10. The optical imaging system of claim 1, wherein a separation distance T45 between the fourth lens and the fifth lens on the optical axis and a separation distance TD between an object side surface of the first lens and an image side surface of the fifth lens on the optical axis satisfy 10 × T45/TD < 0.5.

11. The optical imaging system of claim 1, wherein a central thickness CT2 of the second lens on the optical axis and a central thickness CT4 of the fourth lens on the optical axis satisfy 0.2 < CT2/CT4 < 0.5.

12. The optical imaging system of claim 1, wherein a center thickness CT2 of the second lens on the optical axis and an edge thickness ET2 of the second lens satisfy 0.9 < CT2/ET2 < 1.65.

13. The optical imaging system of claim 1, wherein an effective half aperture ratio DT12 of the image side surface of the first lens and an effective half aperture ratio DT21 of the object side surface of the second lens satisfy 0.9 < DT12/DT21 < 1.2.

14. The optical imaging system of claim 1, wherein an effective half aperture ratio DT21 of the object side surface of the second lens and an effective half aperture ratio DT31 of the object side surface of the third lens satisfy 0.8 < DT21/DT31 < 1.2.

15. The optical imaging system of claim 1, wherein an on-axis distance SAG21 from an intersection of an object-side surface of the second lens and the optical axis to an effective radius vertex of the object-side surface of the second lens and a center thickness CT2 of the second lens on the optical axis satisfy-0.7 < SAG21/CT2 < 0.

16. The optical imaging system of claim 1, wherein an on-axis distance from an intersection of an object-side surface of the third lens and the optical axis to an effective radius vertex of the object-side surface of the third lens, SAG31, and a center thickness of the third lens on the optical axis, CT3 satisfy-0.9 < SAG31/CT3 < -0.2.

17. The optical imaging system according to any one of claims 1 to 16, wherein an effective half aperture DT52 of an image side surface of the fifth lens and a half ImgH of a diagonal length of an effective pixel area on an imaging surface of the optical imaging system satisfy 0.8 < DT52/ImgH < 1.

18. The optical imaging system, in order from an object side to an image side along an optical axis, comprises:

a first lens having a positive refractive power, an object-side surface of which is convex;

a second lens having an optical power;

a third lens having optical power;

the fourth lens with positive focal power has a concave object-side surface and a convex image-side surface;

a fifth lens having a negative optical power;

the total effective focal length f of the optical imaging system, the entrance pupil diameter EPD of the optical imaging system and the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging system on the optical axis satisfy f multiplied by TTL/EPD < 6 mm;

the total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy f/EPD < 1.5.

19. The optical imaging system of claim 18, wherein an on-axis distance SAG42 from an intersection point of an image-side surface of the fourth lens and the optical axis to a vertex of an effective radius of the image-side surface of the fourth lens, an on-axis distance SAG51 between an intersection point of an object-side surface of the fifth lens and the optical axis to a vertex of an effective radius of the object-side surface of the fifth lens, and a distance Tr7r10 from the object-side surface of the fourth lens to the image-side surface of the fifth lens on the optical axis satisfy-1 < (SAG42+ SAG51)/Tr7r10 < -0.3.

20. The optical imaging system of claim 18, wherein the effective focal length f4 of the fourth lens and the total effective focal length f of the optical imaging system satisfy 0.8 < f4/f ≦ 1.5.

21. The optical imaging system of claim 18, wherein TTL satisfies TTL < 4.5mm on the optical axis from an object side surface of the first lens element to an imaging surface of the optical imaging system.

22. The optical imaging system of claim 18, wherein the effective focal length f1 of the first lens and the total effective focal length f of the optical imaging system satisfy 1.5 < f1/f < 2.1.

23. The optical imaging system of claim 18, wherein a radius of curvature R7 of an object-side surface of the fourth lens and a total effective focal length f of the optical imaging system satisfy-0.8 < R7/f < -0.3.

24. The optical imaging system of claim 18, wherein the maximum distortion of the optical imaging system, DISTmax, satisfies DISTmax < 3%.

25. The optical imaging system according to claim 18, wherein a separation distance T12 on the optical axis of the first lens and the second lens, a separation distance T23 on the optical axis of the second lens and the third lens, and a separation distance T34 on the optical axis of the third lens and the fourth lens satisfy 0.35 < T34/(T12+ T23) < 0.7.

26. The optical imaging system of claim 18, wherein a separation distance T45 between the fourth lens and the fifth lens on the optical axis and a separation distance TD between an object-side surface of the first lens and an image-side surface of the fifth lens on the optical axis satisfy 10 × T45/TD < 0.5.

27. The optical imaging system of claim 18, wherein a central thickness CT2 of the second lens on the optical axis and a central thickness CT4 of the fourth lens on the optical axis satisfy 0.2 < CT2/CT4 < 0.5.

28. The optical imaging system of claim 18, wherein a center thickness CT2 of the second lens on the optical axis and an edge thickness ET2 of the second lens satisfy 0.9 < CT2/ET2 < 1.65.

29. The optical imaging system of claim 18, wherein an effective half aperture ratio DT12 of the image side surface of the first lens and an effective half aperture ratio DT21 of the object side surface of the second lens satisfy 0.9 < DT12/DT21 < 1.2.

30. The optical imaging system of claim 18, wherein the effective half aperture ratio DT21 of the object side surface of the second lens and the effective half aperture ratio DT31 of the object side surface of the third lens satisfy 0.8 < DT21/DT31 < 1.2.

31. The optical imaging system of claim 18, wherein an on-axis distance SAG21 from an intersection of the object-side surface of the second lens and the optical axis to an effective radius vertex of the object-side surface of the second lens and a center thickness CT2 of the second lens on the optical axis satisfy-0.7 < SAG21/CT2 < 0.

32. The optical imaging system of claim 18, wherein an on-axis distance from an intersection of an object-side surface of the third lens and the optical axis to an effective radius vertex of the object-side surface of the third lens, SAG31, and a center thickness of the third lens on the optical axis, CT3, satisfy-0.9 < SAG31/CT3 < -0.2.

33. The optical imaging system according to any one of claims 18 to 32, wherein an effective half aperture DT52 of an image side surface of the fifth lens and a half ImgH of a diagonal length of an effective pixel area on an imaging surface of the optical imaging system satisfy 0.8 < DT52/ImgH < 1.

Images