CN114280760A

CN114280760A - Optical imaging system

Info

Publication number: CN114280760A
Application number: CN202111617027.1A
Authority: CN
Inventors: 贺凌波; 赵跇坤; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-12-27
Filing date: 2021-12-27
Publication date: 2022-04-05
Anticipated expiration: 2041-12-27
Also published as: CN114280760B

Abstract

The invention provides an optical imaging system. The light-in side of the optical imaging system comprises the following components in sequence: a first lens element with negative refractive power; the surface of the second lens facing the light incidence side is a convex surface; the surface of the third lens facing to the light emitting side is a concave surface; a fourth lens element with refractive power; a fifth lens element with refractive power; wherein the maximum field angle FOV of the optical imaging system satisfies: FOV > 150 deg. The invention solves the problem of small shooting range of the optical lens in the prior art.

Description

Optical imaging system

Technical Field

The invention relates to the technical field of optical imaging equipment, in particular to an optical imaging system.

Background

With the rapid development of smart phones, the smart phones are not only important communication devices in daily life, but also widely used in various camera shooting fields in daily life, so that the requirements of people on camera shooting functions of the smart phones are higher and higher, especially when shooting objects with wide visual fields such as mountains, rivers and the like. Under such circumstances, wide-angle lenses are gaining favor from more and more mobile phone manufacturers and consumers. Compared with a common mobile phone lens, the wide-angle lens has the advantages that the depth of field is longer, clear imaging can be achieved within a quite large range, the visual angle is larger, and a large viewing range can be obtained within a limited range. In addition, the lens has stronger perspective, and the shot photos more emphasize the contrast between the close shot and the distant shot, thereby generating strong perspective effect in the depth direction. However, in the existing product, the shooting range of the optical lens is small.

That is, the optical lens in the related art has a problem of a small shooting range.

Disclosure of Invention

The invention mainly aims to provide an optical imaging system to solve the problem that an optical lens in the prior art is small in shooting range.

In order to achieve the above object, according to one aspect of the present invention, there is provided an optical imaging system, comprising in order from a light-in side to a light-out side of the optical imaging system: a first lens element with negative refractive power; the surface of the second lens facing the light incidence side is a convex surface; the surface of the third lens facing to the light emitting side is a concave surface; a fourth lens element with refractive power; a fifth lens element with refractive power; wherein the maximum field angle FOV of the optical imaging system satisfies: FOV > 150 deg.

Further, the central thickness CT4 of the fourth lens on the optical axis and the edge thickness ET4 of the fourth lens satisfy: 3.5 < CT4/ET4 < 5.0.

Further, the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD < 2.6.

Further, an on-axis distance TTL from the surface of the first lens facing the light entrance side to the image forming surface, and an air interval T12 on the optical axis between the first lens and the second lens satisfy: 4.0 < TTL/T12 < 5.0.

Further, the edge thickness ET5 of the fifth lens and the central thickness CT5 of the fifth lens on the optical axis satisfy: 1.5 < ET5/CT5 < 2.5.

Further, the edge thickness ET5 of the fifth lens and the on-axis distance SAG51 from the intersection point of the surface of the fifth lens facing the light inlet side and the optical axis to the effective radius vertex of the surface of the fifth lens facing the light inlet side satisfy the following conditions: 6.5 < ET5/SAG51 < -1.5.

Further, the on-axis distance SAG42 between the central thickness CT4 of the fourth lens on the optical axis and the intersection point of the surface of the fourth lens facing the light-emitting side and the optical axis to the effective radius vertex of the surface of the fourth lens facing the light-emitting side satisfies: 2.5 < CT4/SAG42 < -1.5.

Further, the central thickness CT3 of the third lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy: 1.0 < CT3/CT2 < 2.0.

Further, the air interval T12 of the first lens and the second lens on the optical axis, the center thickness CT1 of the first lens on the optical axis satisfy: T12/CT1 is more than 3.0 and less than 6.0.

Further, the curvature radius R7 of the surface of the fourth lens facing the light-in side and the curvature radius R8 of the surface of the fourth lens facing the light-out side satisfy that: 3.5 < (R8-R7)/(R8+ R7) < 14.0.

Further, the radius of curvature R4 of the surface of the second lens facing the light exit side and the effective focal length f of the optical imaging system satisfy: r4/f is more than 3.0 and less than 6.0.

Further, the abbe number V5 of the fifth lens satisfies: v5 < 20.0.

Further, the effective focal length f1 of the first lens, the curvature radius R1 of the surface of the first lens facing the light-in side and the curvature radius R2 of the surface of the first lens facing the light-out side satisfy: -1.5 < f1/(R1+ R2) < -0.6.

According to another aspect of the present invention, there is provided an optical imaging system, comprising, in order from a light-in side to a light-out side of the optical imaging system: a first lens element with negative refractive power; the surface of the second lens facing the light incidence side is a convex surface; the surface of the third lens facing to the light emitting side is a concave surface; a fourth lens element with refractive power; a fifth lens element with refractive power; and the combined focal length f45 of the fourth lens and the fifth lens and the effective focal length f of the optical imaging system satisfy that: f45/f is more than 0.5 and less than 1.5.

Further, the abbe number V5 of the fifth lens satisfies: v5 < 20.0.

Further, the combined focal length f45 of the fourth lens and the fifth lens and the effective focal length f of the optical imaging system satisfy that: f45/f is more than 0.5 and less than 1.5.

By applying the technical scheme of the invention, the light-in side of the optical imaging system sequentially comprises the following components: the first lens element comprises a first lens element with negative refractive power, a second lens element, a third lens element, a fourth lens element and a fifth lens element; the second lens has negative refractive power, and the surface of the second lens facing the light incident side is a convex surface; the third lens has refractive power, and the surface of the third lens, which faces the light emitting side, is a concave surface; the fourth lens element with refractive power; the fifth lens element with refractive power; wherein the maximum field angle FOV of the optical imaging system satisfies: FOV > 150 deg.

The optical imaging system has the advantage of large field angle by setting the refractive power of the first lens element to be negative, and the refractive power of the second lens element to be negative, and the surface of the second lens element facing the light-in side is convex, which is beneficial to increasing the field angle and correcting the off-axis aberration of the optical imaging system. The surface facing the light emitting side is a concave surface by matching with the third lens, so that the image quality of the optical imaging system can be effectively improved, and the imaging quality of the optical imaging system is ensured. And the maximum field angle of the optical imaging system is controlled to be more than 150 degrees, which is beneficial to obtaining a larger field range so as to increase the shooting range of the optical imaging system.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic configuration diagram showing an optical imaging system according to a first example of the present invention;

fig. 2 to 4 show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve of the optical imaging system in fig. 1, respectively;

fig. 5 is a schematic structural view showing an optical imaging system of a second example of the present invention;

fig. 6 to 8 show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging system in fig. 5;

fig. 9 is a schematic configuration diagram showing an optical imaging system of example three of the present invention;

fig. 10 to 12 show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging system in fig. 9;

fig. 13 is a schematic configuration diagram showing an optical imaging system of example four of the present invention;

fig. 14 to 16 show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging system in fig. 13;

fig. 17 is a schematic structural view showing an optical imaging system of example five of the present invention;

fig. 18 to 20 show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging system in fig. 17;

fig. 21 is a schematic configuration diagram showing an optical imaging system of example six of the present invention;

fig. 22 to 24 show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging system in fig. 21;

wherein the figures include the following reference numerals:

STO, stop; e1, first lens; s1, the surface of the first lens facing the light incidence side; s2, the surface of the first lens facing the light-emitting side; e2, second lens; s3, the surface of the second lens facing the light incidence side; s4, the surface of the second lens facing the light-emitting side; e3, third lens; s5, the surface of the third lens facing the light incidence side; s6, the surface of the third lens facing the light-emitting side; e4, fourth lens; s7, the surface of the fourth lens facing the light incidence side; s8, the surface of the fourth lens facing the light-emitting side; e5, fifth lens; s9, the surface of the fifth lens facing the light incidence side; s10, the surface of the fifth lens facing the light-emitting side; e6, a filter plate; s11, the surface of the filter plate facing to the light incident side; s12, the surface of the filter plate facing the light-emitting side; and S13, imaging surface.

Detailed Description

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 invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is noted that, unless otherwise indicated, all 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.

In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

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 close to the object side becomes the surface of the lens facing the light inlet side, and the surface of each lens close to the image side is called the surface of the lens facing the light outlet side. The determination of the surface shape in the paraxial region can be performed by determining whether or not the surface shape is concave or convex, based on the R value (R denotes the radius of curvature of the paraxial region, and usually denotes the R value in a lens database (lens data) in optical software) in accordance with the determination method of a person ordinarily skilled in the art. For the object side surface, when the R value is positive, the object side surface is judged to be convex, and when the R value is negative, the object side surface is judged to be concave; in the case of the image side surface, the image side surface is determined to be concave when the R value is positive, and is determined to be convex when the R value is negative.

The invention provides an optical imaging system, aiming at solving the problem that the shooting range of an optical lens in the prior art is small.

As shown in fig. 1 to 24, the light-entering side and the light-exiting side of the optical imaging system sequentially include: the first lens element comprises a first lens element with negative refractive power, a second lens element, a third lens element, a fourth lens element and a fifth lens element; the second lens has negative refractive power, and the surface of the second lens facing the light incident side is a convex surface; the third lens has refractive power, and the surface of the third lens, which faces the light emitting side, is a concave surface; the fourth lens element with refractive power; the fifth lens element with refractive power; wherein the maximum field angle FOV of the optical imaging system satisfies: FOV > 150 deg.

Preferably, the maximum field angle FOV of the optical imaging system satisfies: 155 < FOV < 175.

In the present embodiment, the central thickness CT4 of the fourth lens on the optical axis and the edge thickness ET4 of the fourth lens satisfy: 3.5 < CT4/ET4 < 5.0. By controlling the CT4/ET4 within a reasonable range, the processing difficulty of the lens can be reduced, the angle between the principal ray and the optical axis when the principal ray is incident on the image plane can be reduced, and the relative illumination of the image plane is improved. Preferably 3.6 < CT4/ET4 < 4.8.

In the present embodiment, the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD < 2.6. The ratio of the effective focal length of the optical imaging system to the entrance pupil diameter of the optical imaging system is reasonably controlled within a reasonable range, so that the large field angle is favorably realized, a wider field of view is shot, and a large clear imaging range is obtained. Preferably, 1.5 < f/EPD < 2.5.

In the present embodiment, an on-axis distance TTL from a surface of the first lens facing the light entrance side to the image forming surface, and an air interval T12 on the optical axis between the first lens and the second lens satisfy: 4.0 < TTL/T12 < 5.0. The ratio of the distance from the surface of the first lens facing the light incidence side to the axis of the imaging surface to the air space of the first lens and the second lens on the optical axis is reasonably controlled within a reasonable range, and the size distribution of the lenses is reasonably distributed to obtain high resolution. Preferably, 4.1 < TTL/T12 < 4.8.

In the present embodiment, the edge thickness ET5 of the fifth lens and the central thickness CT5 of the fifth lens on the optical axis satisfy: 1.5 < ET5/CT5 < 2.5. By reasonably controlling the ratio range of ET5 and CT5, the processing difficulty of the lens can be reduced, the angle between the principal ray incident on the image plane and the optical axis can be reduced, and the relative illumination of the image plane can be improved. Preferably, 1.57 < ET5/CT5 < 2.5.

In the embodiment, the edge thickness ET5 of the fifth lens and the on-axis distance SAG51 from the intersection point of the surface of the fifth lens facing the light incidence side and the optical axis to the effective radius vertex of the surface of the fifth lens facing the light incidence side satisfy the following conditions: 6.5 < ET5/SAG51 < -1.5. The ET5/SAG51 is controlled within a reasonable range, so that the angle of the principal ray of the optical imaging system is adjusted, the relative brightness of the optical imaging system can be effectively improved, the image plane definition is improved, and the imaging quality of the optical imaging system is ensured. Preferably, -6.2 < ET5/SAG51 < -1.7.

In the present embodiment, the on-axis distance SAG42 between the central thickness CT4 of the fourth lens on the optical axis and the intersection point of the surface of the fourth lens facing the light-emitting side and the optical axis to the effective radius vertex of the surface of the fourth lens facing the light-emitting side satisfies: 2.5 < CT4/SAG42 < -1.5. By controlling the CT4/SAG42 within a reasonable range, the light angle of the optical imaging system can be adjusted, the relative brightness of the optical imaging system can be effectively improved, the image plane definition is improved, and the imaging quality of the optical imaging system is improved. Preferably, -2.4 < CT4/SAG42 < -1.6.

In the present embodiment, the central thickness CT3 of the third lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy: 1.0 < CT3/CT2 < 2.0. The ratio of the central thickness of the third lens on the optical axis to the central thickness of the second lens on the optical axis is controlled within a certain range, so that the optical lens has good processing characteristics. Preferably, 1.1 < CT3/CT2 < 1.9.

In the present embodiment, the air interval T12 of the first lens and the second lens on the optical axis, and the center thickness CT1 of the first lens on the optical axis satisfy: T12/CT1 is more than 3.0 and less than 6.0. The ratio of the air interval of the first lens and the second lens on the optical axis to the central thickness of the first lens on the optical axis is controlled within a certain range, so that the on-axis aberration generated by the first lens can be effectively balanced. Preferably, 3.2 < T12/CT1 < 5.8.

In the present embodiment, a curvature radius R7 of a surface of the fourth lens facing the light-in side and a curvature radius R8 of a surface of the fourth lens facing the light-out side satisfy: 3.5 < (R8-R7)/(R8+ R7) < 14.0. The curvature radius of the surface of the fourth lens facing the light inlet side and the curvature radius of the surface of the fourth lens facing the light outlet side are controlled reasonably, so that the fourth lens is favorably ensured to have proper refractive power, the included angle between the main light incident on the image plane and the optical axis is reduced, the illumination of the image plane is improved, and the optical imaging system can image clearly under the condition of a large field angle. Preferably 3.52 < (R8-R7)/(R8+ R7) < 13.95.

In the present embodiment, a radius of curvature R4 of the surface of the second lens facing the light exit side and an effective focal length f of the optical imaging system satisfy: r4/f is more than 3.0 and less than 6.0. By controlling the R4/f within a certain range, the deflection angle of the off-axis field light on the surface of the second lens facing to the light-emitting side can be controlled, and the matching degree with the chip is increased. Preferably, 3.2 < R4/f < 6.0.

In the present embodiment, the abbe number V5 of the fifth lens satisfies: v5 < 20.0. The Abbe number of the fifth lens is controlled to be smaller than a certain range, so that the chromatic aberration of the optical imaging system is optimized, and the imaging quality of the optical imaging system is improved. Preferably 18 < V5 < 20.0.

In the present embodiment, the effective focal length f1 of the first lens, the radius of curvature R1 of the surface of the first lens facing the light-in side, and the radius of curvature R2 of the surface of the first lens facing the light-out side satisfy: -1.5 < f1/(R1+ R2) < -0.6. By limiting f1/(R1+ R2) within a reasonable range, the first lens can be manufactured and molded easily while ensuring the focal length of the first lens. Preferably, -1.4 < f1/(R1+ R2) < -0.7.

Example two

As shown in fig. 1 to 24, the light-entering side and the light-exiting side of the optical imaging system sequentially include: the lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens element with negative refractive power; the second lens has negative refractive power, and the surface of the second lens facing the light incident side is a convex surface; the third lens has refractive power, and the surface of the third lens, which faces the light emitting side, is a concave surface; the fourth lens element with refractive power; the fifth lens element with refractive power; and the combined focal length f45 of the fourth lens and the fifth lens and the effective focal length f of the optical imaging system satisfy that: f45/f is more than 0.5 and less than 1.5.

The optical imaging system has the advantage of large field angle by setting the refractive power of the first lens element to be negative, and the refractive power of the second lens element to be negative, and the surface of the second lens element facing the light-in side is convex, which is beneficial to increasing the field angle and correcting the off-axis aberration of the optical imaging system. The surface facing the light emitting side is a concave surface by matching with the third lens, so that the image quality of the optical imaging system can be effectively improved, and the imaging quality of the optical imaging system is ensured. The ratio of the combined focal length of the fourth lens and the fifth lens to the effective focal length of the optical imaging system is controlled within a reasonable range, so that the optical imaging system can better balance aberration, and the resolution of the system can be improved.

Preferably, the combined focal length f45 of the fourth lens and the fifth lens and the effective focal length f of the optical imaging system satisfy that: f45/f is more than 0.7 and less than 1.48.

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

The optical imaging system in the present application may employ a plurality of lenses, such as the five lenses described above. By reasonably distributing the refractive power, the surface shape, the central thickness of each lens, the on-axis distance between each lens and the like, the aperture of the optical imaging system can be effectively increased, the sensitivity of the lens can be reduced, and the machinability of the lens can be improved, so that the optical imaging system is more beneficial to production and processing and can be suitable for portable electronic equipment such as smart phones.

In the present application, at least one of the mirror surfaces of each 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.

However, it will be appreciated by those skilled in the art that the number of lenses making up the optical imaging system can be varied to achieve the various results and advantages described in this 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, as desired.

Examples of specific surface types and parameters applicable to the optical imaging system of the above embodiment are further described below with reference to the drawings.

It should be noted that any one of the following examples one to six is applicable to all embodiments of the present application.

Example one

As shown in fig. 1 to 4, an optical imaging system of the first example of the present application is described. Fig. 1 shows a schematic diagram of the configuration of an optical imaging system of example one.

As shown in fig. 1, the optical imaging system includes, in order from the light incident side to the light exit side, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.

The first lens element E1 with negative refractive power has a convex surface S1 facing the light-incident side and a concave surface S2 facing the light-exit side. The second lens element E2 with negative refractive power has a convex surface S3 facing the light-incident side and a concave surface S4 facing the light-exit side. The third lens element E3 with positive refractive power has a convex surface S5 facing the light-incident side and a concave surface S6 facing the light-exit side. The fourth lens element E4 with positive refractive power has a convex surface facing the light-incident side S7 and a convex surface facing the light-exit side S8. The fifth lens element E5 with negative refractive power has a concave surface facing the light-incident side S9 and a concave surface facing the light-exiting side S10. The filter E6 has a surface S11 facing the light entrance side of the filter and a surface S12 facing the light exit side of the filter. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

In this example, the total effective focal length f of the optical imaging system is 1.09mm, the total length TTL of the optical imaging system is 4.2mm, and the image height ImgH is 1.32 mm.

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

TABLE 1

In the first example, a surface facing the light incident side and a surface facing the light exiting side of any one of the first lens E1 to the fifth lens E5 are aspheric, and the surface shape of each aspheric lens can be defined by, but is not limited to, the following aspheric 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 gives the high-order coefficient A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30, which can be used for each of the aspherical mirrors S1-S10 in example one.

TABLE 2

Fig. 2 shows an on-axis chromatic aberration curve of the optical imaging system of example one, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the optical imaging system. Fig. 3 shows astigmatism curves of the optical imaging system of example one, which represent meridional field curvature and sagittal field curvature. Fig. 4 shows a chromatic aberration of magnification curve of the optical imaging system of the first example, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging system.

As can be seen from fig. 2 to 4, the optical imaging system of example one can achieve good imaging quality.

Example two

As shown in fig. 5 to 8, an optical imaging system of example two of the present application is described. In this example and the following examples, descriptions of parts similar to example one will be omitted for the sake of brevity. Fig. 5 shows a schematic diagram of the structure of an optical imaging system of example two.

As shown in fig. 5, the optical imaging system includes, in order from the light incident side to the light exit side, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.

The first lens element E1 with negative refractive power has a convex surface S1 facing the light-incident side and a concave surface S2 facing the light-exit side. The second lens element E2 with negative refractive power has a convex surface S3 facing the light-incident side and a concave surface S4 facing the light-exit side. The third lens element E3 with positive refractive power has a convex surface S5 facing the light-incident side and a concave surface S6 facing the light-exit side. The fourth lens element E4 with positive refractive power has a convex surface facing the light-incident side S7 and a convex surface facing the light-exit side S8. The fifth lens element E5 with negative refractive power has a concave surface facing the light-incident side S9 and a convex surface facing the light-exit side S10. The filter E6 has a surface S11 facing the light entrance side of the filter and a surface S12 facing the light exit side of the filter. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

In this example, the total effective focal length f of the optical imaging system is 1.03mm, the total length TTL of the optical imaging system is 4.72mm, and the image height ImgH is 1.32 mm.

Table 3 shows a basic structural parameter table of the optical imaging system of example two, in which the units of the radius of curvature, the thickness/distance, the focal length, and the effective radius are all millimeters (mm).

TABLE 3

Table 4 shows the high-order term coefficients that can be used for each aspherical mirror surface in example two, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-3.6559E-01

-8.8886E-02

1.8282E-03

-1.1313E-02

-9.0115E-04

-1.3102E-03

-5.1178E-04

S2

1.4212E-01

-3.8513E-03

2.4041E-03

-1.4021E-03

-6.3413E-04

2.4047E-04

6.7476E-04

S3

-1.4694E-02

-1.0623E-03

-1.9585E-04

-1.0869E-05

-9.9096E-06

2.5141E-06

-1.2022E-06

S4

-9.4807E-02

2.4716E-04

-8.9410E-04

8.2624E-05

-8.1890E-05

2.0623E-05

-2.9806E-06

S5

-1.1495E-01

4.8211E-03

-3.8952E-04

5.0985E-04

-2.5690E-05

1.5171E-04

5.6510E-05

S6

-1.7376E-01

1.7865E-02

-3.6828E-03

1.0217E-03

-4.7343E-04

1.3107E-04

-3.2396E-05

S7

-2.9333E-01

4.2947E-02

-1.0390E-02

1.6531E-03

-1.4803E-03

3.3595E-04

-1.6332E-04

S8

3.2547E-02

-6.4438E-03

-1.0700E-02

4.7021E-03

-1.4310E-03

3.4026E-03

-1.5618E-03

S9

-5.2289E-02

1.9130E-02

-4.1255E-03

6.8020E-03

-1.1231E-03

2.3754E-03

-8.1025E-04

S10

-2.0378E-01

-3.3046E-03

9.9773E-03

-1.0942E-03

-6.7676E-04

-8.0193E-04

-4.1071E-07

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-3.0059E-04

-1.1766E-04

-6.0550E-05

2.2854E-06

-7.5403E-06

-1.8877E-05

-2.2751E-05

S2

5.8112E-04

4.1970E-04

2.1011E-04

9.1005E-05

6.2971E-06

-8.7793E-06

-7.7871E-06

S3

3.2291E-07

-1.2792E-06

2.2693E-07

-4.8603E-07

6.2265E-07

-3.6202E-09

-8.0086E-08

S4

5.6371E-06

2.8878E-06

3.3583E-06

2.6174E-06

1.2432E-06

1.1147E-06

2.8679E-07

S5

5.2403E-05

2.5887E-05

1.9166E-05

8.3567E-06

3.7367E-06

1.5465E-07

2.1207E-07

S6

1.8812E-05

-5.9582E-06

7.8112E-07

-5.2302E-07

7.9614E-08

5.5726E-07

-2.0433E-07

S7

3.9012E-05

-2.9891E-05

1.2341E-05

-3.2068E-06

1.0730E-06

-1.0520E-06

1.3898E-06

S8

-3.0402E-05

-1.5930E-04

3.7440E-04

-2.4335E-04

-2.7262E-04

-1.9300E-04

1.5985E-05

S9

-1.6802E-04

-5.6494E-04

4.0717E-05

-5.2493E-06

9.3919E-06

-6.8260E-05

-4.9938E-06

S10

5.1820E-04

2.8501E-04

-8.7405E-05

-4.8323E-04

-3.6251E-04

-1.4144E-04

-2.4790E-05

TABLE 4

Fig. 6 shows an on-axis chromatic aberration curve of the optical imaging system of example two, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the optical imaging system. Fig. 7 shows astigmatism curves of the optical imaging system of example two, which represent meridional field curvature and sagittal field curvature. Fig. 8 shows a chromatic aberration of magnification curve of the optical imaging system of example two, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging system.

As can be seen from fig. 6 to 8, the optical imaging system of example two can achieve good imaging quality.

Example III

As shown in fig. 9 to 12, an optical imaging system of example three of the present application is described. Fig. 9 shows a schematic diagram of the structure of an optical imaging system of example three.

As shown in fig. 9, the optical imaging system includes, in order from the light incident side to the light exit side, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.

The first lens element E1 with negative refractive power has a convex surface S1 facing the light-incident side and a concave surface S2 facing the light-exit side. The second lens element E2 with negative refractive power has a convex surface S3 facing the light-incident side and a concave surface S4 facing the light-exit side. The third lens element E3 with positive refractive power has a convex surface S5 facing the light-incident side and a concave surface S6 facing the light-exit side. The fourth lens element E4 with positive refractive power has a convex surface facing the light-incident side S7 and a convex surface facing the light-exit side S8. The fifth lens element E5 with negative refractive power has a convex surface S9 facing the light-incident side and a concave surface S10 facing the light-exit side. The filter E6 has a surface S11 facing the light entrance side of the filter and a surface S12 facing the light exit side of the filter. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

In this example, the total effective focal length f of the optical imaging system is 1.04mm, the total length TTL of the optical imaging system is 4.39mm, and the image height ImgH is 1.32 mm.

Table 5 shows a basic structural parameter table of the optical imaging system of example three, in which the units of the radius of curvature, the thickness/distance, the focal length, and the effective radius are all millimeters (mm).

TABLE 5

Table 6 shows the high-order term coefficients that can be used for each aspherical mirror surface in example three, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-4.7652E-01

-7.4642E-02

3.0846E-03

-1.0685E-02

-2.9953E-03

-4.5837E-04

-8.1002E-04

S2

6.7945E-02

-2.4282E-02

2.9282E-03

-2.3103E-04

-8.1455E-04

-2.5512E-04

1.3630E-04

S3

-1.6292E-02

-7.2522E-04

-6.5420E-05

5.5895E-05

5.2341E-05

7.3088E-05

5.8749E-05

S4

-8.8391E-02

9.4586E-05

-3.2196E-04

-7.1501E-05

-1.0480E-04

2.0717E-05

-1.1091E-05

S5

-1.0641E-01

5.7003E-03

-1.3249E-05

-1.4672E-04

-3.3023E-04

6.7140E-05

-3.1470E-05

S6

-1.7377E-01

1.9218E-02

-3.1076E-03

8.5167E-04

-9.1340E-04

1.7211E-04

-7.0445E-05

S7

-2.8618E-01

3.5124E-02

-1.2307E-02

3.3431E-03

-1.4981E-03

7.1596E-04

-3.0994E-04

S8

1.1350E-01

-1.8008E-02

-2.8308E-03

4.1521E-03

9.3243E-04

-1.6265E-03

7.8603E-04

S9

-1.4851E-01

1.9811E-02

2.8329E-03

-3.5864E-03

2.2141E-03

-6.8034E-04

5.7428E-05

S10

-2.9833E-01

1.7239E-02

4.6387E-03

-5.4552E-03

4.3298E-03

-6.5535E-04

2.2861E-04

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-2.8090E-04

-1.3308E-04

-6.7928E-05

-6.2288E-05

-2.5101E-05

-1.5604E-05

-1.1059E-05

S2

-5.0227E-05

1.9364E-05

-4.3590E-05

1.3578E-05

-3.3664E-05

-4.1931E-06

-2.5278E-05

S3

5.6546E-05

4.1569E-05

3.4628E-05

2.2293E-05

1.4885E-05

6.2836E-06

2.7754E-06

S4

4.2277E-06

-3.4652E-06

-1.1517E-06

-1.7227E-06

-1.5796E-06

8.5028E-07

5.7535E-07

S5

3.2134E-06

-8.9715E-06

3.7795E-06

5.1825E-07

6.9569E-07

4.4584E-07

-2.5947E-07

S6

1.6660E-05

-1.6225E-05

1.7389E-07

3.3064E-06

-5.7362E-07

2.8252E-06

-1.4724E-06

S7

3.6115E-05

-6.9606E-05

1.6431E-05

-2.3270E-06

-3.4173E-06

1.9164E-06

-4.3198E-06

S8

-1.8562E-04

2.8572E-04

-4.6987E-05

-1.0495E-04

9.7621E-05

-9.8113E-05

-2.3553E-05

S9

-5.0589E-05

-4.1220E-05

1.0572E-04

-3.2375E-05

-7.5056E-06

4.1036E-06

-3.7338E-07

S10

-3.7260E-04

-3.5827E-04

-5.1416E-06

5.6974E-05

8.8123E-05

3.0826E-05

-2.4365E-05

TABLE 6

Fig. 10 shows an on-axis chromatic aberration curve of the optical imaging system of example three, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging system. Fig. 11 shows astigmatism curves of the optical imaging system of example three, which represent meridional field curvature and sagittal field curvature. Fig. 12 shows a chromatic aberration of magnification curve of the optical imaging system of example three, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging system.

As can be seen from fig. 10 to 12, the optical imaging system of example three can achieve good imaging quality.

Example four

As shown in fig. 13 to 16, an optical imaging system of example four of the present application is described. Fig. 13 shows a schematic diagram of the configuration of an optical imaging system of example four.

As shown in fig. 13, the optical imaging system includes, in order from the light incident side to the light exit side, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.

The first lens element E1 with negative refractive power has a convex surface S1 facing the light-incident side and a concave surface S2 facing the light-exit side. The second lens element E2 with negative refractive power has a convex surface S3 facing the light-incident side and a concave surface S4 facing the light-exit side. The third lens element E3 with negative refractive power has a convex surface S5 facing the light-incident side and a concave surface S6 facing the light-exit side. The fourth lens element E4 with positive refractive power has a convex surface facing the light-incident side S7 and a convex surface facing the light-exit side S8. The fifth lens element E5 with negative refractive power has a concave surface facing the light-incident side S9 and a concave surface facing the light-exiting side S10. The filter E6 has a surface S11 facing the light entrance side of the filter and a surface S12 facing the light exit side of the filter. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

In this example, the total effective focal length f of the optical imaging system is 1.10mm, the total length TTL of the optical imaging system is 4.51mm, and the image height ImgH is 1.32 mm.

Table 7 shows a basic structural parameter table of the optical imaging system of example four, in which the units of the radius of curvature, the thickness/distance, the focal length, and the effective radius are all millimeters (mm).

TABLE 7

Table 8 shows the high-order term coefficients that can be used for each aspherical mirror surface in example four, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

TABLE 8

Fig. 14 shows an on-axis chromatic aberration curve of the optical imaging system of example four, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging system. Fig. 15 shows astigmatism curves of the optical imaging system of example four, which represent meridional field curvature and sagittal field curvature. Fig. 16 shows a chromatic aberration of magnification curve of the optical imaging system of example four, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging system.

As can be seen from fig. 14 to 16, the optical imaging system according to example four can achieve good imaging quality.

Example five

As shown in fig. 17 to 20, an optical imaging system of example five of the present application is described. Fig. 17 shows a schematic diagram of the structure of an optical imaging system of example five.

As shown in fig. 17, the optical imaging system includes, in order from the light incident side to the light exit side, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.

The first lens element E1 with negative refractive power has a convex surface S1 facing the light-incident side and a concave surface S2 facing the light-exit side. The second lens element E2 with negative refractive power has a convex surface S3 facing the light-incident side and a concave surface S4 facing the light-exit side. The third lens element E3 with negative refractive power has a concave surface S5 facing the light-incident side and a concave surface S6 facing the light-exit side. The fourth lens element E4 with positive refractive power has a convex surface facing the light-incident side S7 and a convex surface facing the light-exit side S8. The fifth lens element E5 with negative refractive power has a concave surface facing the light-incident side S9 and a concave surface facing the light-exiting side S10. The filter E6 has a surface S11 facing the light entrance side of the filter and a surface S12 facing the light exit side of the filter. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

In this example, the total effective focal length f of the optical imaging system is 1.10mm, the total length TTL of the optical imaging system is 4.50mm, and the image height ImgH is 1.32 mm.

Table 9 shows a basic structural parameter table of the optical imaging system of example five, in which the units of the radius of curvature, the thickness/distance, the focal length, and the effective radius are all millimeters (mm).

TABLE 9

Table 10 shows the high-order term coefficients that can be used for each aspherical mirror surface in example five, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-4.5338E-01

-7.4863E-02

6.4762E-03

-1.2013E-02

-1.1474E-03

-7.6022E-04

-6.8355E-04

S2

6.0206E-02

-2.8398E-02

3.5399E-03

1.8898E-04

-2.8905E-04

-2.2906E-05

7.2296E-05

S3

-1.9966E-02

-9.4993E-04

1.6757E-05

-5.0994E-05

1.2694E-05

-1.0755E-05

5.6641E-06

S4

-8.8930E-02

-3.6509E-03

1.4627E-03

1.7584E-04

4.4851E-05

1.7771E-04

2.4771E-05

S5

-9.5144E-02

-8.6971E-04

2.7405E-03

-2.4617E-03

-6.8975E-04

9.4020E-05

-2.9442E-04

S6

-2.0676E-01

2.2490E-02

-3.4380E-03

1.4156E-03

-7.5379E-04

-1.2044E-05

-4.3191E-06

S7

-3.0611E-01

4.3812E-02

-1.5398E-02

3.9017E-03

-1.9617E-03

6.6351E-04

-2.5410E-04

S8

1.1350E-01

-3.6048E-02

3.9681E-03

-4.2338E-03

1.4135E-03

-6.1802E-04

1.7741E-04

S9

-1.0871E-01

2.4506E-02

3.0556E-03

-2.8431E-03

2.3129E-03

-5.9525E-04

-3.3364E-05

S10

-2.7490E-01

3.2143E-02

-3.9396E-03

-5.2378E-04

6.3428E-04

-9.3287E-05

1.5008E-05

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-1.5607E-04

-7.6966E-05

-5.8814E-05

-2.9231E-05

-1.2006E-05

-1.4376E-05

-1.4994E-05

S2

-3.9252E-05

5.4453E-06

-1.6393E-05

1.6528E-05

-6.8721E-06

7.3057E-06

-2.7786E-06

S3

-5.1022E-06

1.3777E-06

-3.9563E-06

5.0512E-07

-1.0455E-06

1.8903E-06

-2.7973E-07

S4

-4.4581E-05

-1.2742E-04

-1.0755E-04

-8.9779E-05

-4.3083E-05

-1.7904E-05

-2.9356E-07

S5

-2.5239E-04

2.2529E-05

1.4803E-04

9.5694E-05

2.7102E-05

-3.9481E-06

-7.2161E-06

S6

-1.6297E-05

1.9157E-05

-2.6688E-05

2.8812E-06

-1.0493E-05

1.7756E-06

-3.6125E-06

S7

7.8033E-05

-2.7390E-05

1.0316E-05

5.5414E-06

-3.3639E-06

1.7939E-06

-5.4908E-07

S8

-8.5129E-05

-5.2343E-05

8.3278E-05

-2.7098E-05

3.0094E-07

2.4659E-06

7.5870E-08

S9

-2.8307E-05

-2.6745E-05

8.6876E-05

-3.3186E-05

-7.2997E-06

5.2240E-06

-5.4006E-07

S10

-3.2761E-05

-1.4900E-05

1.3743E-05

8.8398E-07

-2.6840E-06

2.6502E-07

1.1877E-07

Watch 10

Fig. 18 shows an on-axis chromatic aberration curve of the optical imaging system of example five, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging system. Fig. 19 shows astigmatism curves of the optical imaging system of example five, which represent meridional field curvature and sagittal field curvature. Fig. 20 shows a chromatic aberration of magnification curve of the optical imaging system of example five, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging system.

As can be seen from fig. 18 to 20, the optical imaging system according to example five can achieve good imaging quality.

Example six

As shown in fig. 21 to 24, an optical imaging system of example six of the present application is described. Fig. 21 shows a schematic diagram of the configuration of an optical imaging system of example six.

As shown in fig. 21, the optical imaging system includes, in order from the light incident side to the light exit side, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.

The first lens element E1 with negative refractive power has a convex surface S1 facing the light-incident side and a concave surface S2 facing the light-exit side. The second lens element E2 with negative refractive power has a convex surface S3 facing the light-incident side and a concave surface S4 facing the light-exit side. The third lens element E3 with positive refractive power has a convex surface S5 facing the light-incident side and a concave surface S6 facing the light-exit side. The fourth lens element E4 with positive refractive power has a convex surface facing the light-incident side S7 and a convex surface facing the light-exit side S8. The fifth lens element E5 with positive refractive power has a convex surface S9 facing the light-incident side and a concave surface S10 facing the light-exit side. The filter E6 has a surface S11 facing the light entrance side of the filter and a surface S12 facing the light exit side of the filter. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

In this example, the total effective focal length f of the optical imaging system is 0.79mm, the total length TTL of the optical imaging system is 4.08mm and the image height ImgH is 1.32 mm.

Table 11 shows a basic structural parameter table of the optical imaging system of example six, in which the units of the radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

TABLE 11

Table 12 shows the high-order term coefficients that can be used for each of the aspherical mirror surfaces in example six, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-4.6735E-01

-7.7723E-02

-2.8952E-03

-3.0771E-03

-7.0848E-03

2.5901E-04

-1.1169E-04

S2

6.0320E-02

-3.4647E-02

-1.2139E-03

4.0930E-03

-8.2327E-04

-1.4349E-03

4.5587E-05

S3

-1.9011E-02

-3.7872E-04

2.2078E-04

1.7176E-04

3.9023E-05

1.0448E-05

1.7512E-05

S4

-8.9902E-02

-6.4874E-04

-6.1676E-04

-8.6467E-05

-1.2862E-04

3.1321E-05

6.9620E-05

S5

-1.0532E-01

6.7708E-03

-7.4499E-04

2.2469E-04

-4.6307E-04

1.4334E-04

1.0518E-04

S6

-1.8588E-01

1.9859E-02

-2.7043E-03

7.0641E-04

-6.9018E-04

1.0681E-05

-1.8000E-04

S7

-2.8931E-01

2.6353E-02

-5.8764E-03

-6.1196E-04

9.4087E-04

-5.3141E-04

7.9969E-05

S8

-1.8495E-02

9.1749E-02

-3.9558E-02

2.2702E-02

-6.0783E-03

-1.5585E-03

2.3221E-03

S9

-1.7879E-01

1.8578E-02

1.9642E-03

-4.1719E-03

2.6769E-03

-8.8400E-04

1.7193E-04

S10

-2.4166E-01

-4.2105E-02

2.0929E-02

-1.8206E-02

9.4981E-03

-2.7188E-03

4.1773E-04

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-2.6349E-04

1.9335E-05

3.2379E-05

4.9431E-05

-3.4405E-05

-3.9057E-05

-1.5748E-05

S2

-4.4713E-05

3.5244E-05

-3.2190E-05

4.2552E-05

8.2713E-06

6.4006E-06

-3.2332E-05

S3

5.4324E-05

6.5493E-05

4.7409E-05

1.8092E-05

-6.1882E-07

-6.8863E-06

-3.3503E-06

S4

1.4207E-05

2.4590E-05

2.4114E-05

3.9300E-05

2.0587E-05

1.1011E-05

-4.0224E-07

S5

1.7460E-05

-7.1694E-05

-3.7169E-05

-1.2230E-05

4.7186E-06

-1.9088E-06

-2.5173E-06

S6

3.2433E-04

-3.7755E-05

8.1464E-05

-6.9392E-05

1.4196E-05

-2.4996E-05

1.2418E-05

S7

4.2314E-05

-3.0381E-04

-6.3507E-05

8.2038E-05

2.4457E-04

1.5460E-04

1.1072E-04

S8

-2.1809E-04

-2.4145E-04

-3.7527E-04

4.5727E-04

2.9353E-04

-1.8232E-04

-1.4774E-04

S9

2.2948E-04

-1.6105E-04

-1.2058E-05

4.4705E-05

9.9684E-06

-3.2166E-05

1.0174E-05

S10

-2.3190E-04

-2.1058E-04

-2.5186E-04

1.1340E-04

2.9110E-04

-1.8640E-04

-4.8238E-05

TABLE 12

Fig. 22 shows an on-axis chromatic aberration curve of the optical imaging system of example six, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging system. Fig. 23 shows astigmatism curves of the optical imaging system of example six, which represent meridional field curvature and sagittal field curvature. Fig. 24 shows a chromatic aberration of magnification curve of the optical imaging system of example six, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging system.

As can be seen from fig. 22 to 24, the optical imaging system according to example six can achieve good imaging quality.

To sum up, examples one to six satisfy the relationships shown in table 13, respectively.

Watch 13

Table 14 gives the effective focal lengths f of the optical imaging systems of example one to example six, and the effective focal lengths f1 to f5 of the respective lenses.

Example parameters	1	2	3	4	5	6
							f(mm)	1.09	1.03	1.04	1.10	1.10	0.79
f1(mm)	-2.20	-1.57	-1.78	-2.05	-2.12	-1.34
							f2(mm)	-8.54	-59.01	-6.52	-8.53	-8.52	-6.52
f3(mm)	3.64	3.68	3.87	-100.00	-17.45	8.66
							f4(mm)	0.93	0.98	0.96	0.84	0.85	1.03
f5(mm)	-1.24	-1.57	-2.08	-1.28	-1.30	100.00
							TTL(mm)	4.20	4.72	4.39	4.51	4.50	4.08
ImgH(mm)	1.32	1.32	1.32	1.32	1.32	1.32
							Semi-FOV(°)	83.2	84.6	83.5	82.9	82.9	85.1
SAG51(mm)	-0.39	-0.51	-0.14	-0.34	-0.32	-0.10

TABLE 14

The present application also provides an imaging device whose electron photosensitive element 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.

It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An optical imaging system, comprising, in order from an incident side to an outgoing side of the optical imaging system:

a first lens element with negative refractive power;

the surface of the second lens facing the light incidence side is a convex surface;

the surface of the third lens facing the light emitting side is a concave surface;

a fourth lens element with refractive power;

a fifth lens element with refractive power;

wherein a maximum field angle FOV of the optical imaging system satisfies: FOV > 150 deg.

2. The optical imaging system of claim 1, wherein the fourth lens has a center thickness CT4 on an optical axis and an edge thickness ET4 of the fourth lens that satisfies: 3.5 < CT4/ET4 < 5.0.

3. The optical imaging system of claim 1, wherein an effective focal length f of the optical imaging system and an entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD < 2.6.

4. The optical imaging system of claim 1, wherein an on-axis distance TTL from a surface of the first lens facing the light incident side to the imaging plane and an air interval T12 on the optical axis between the first lens and the second lens satisfy: 4.0 < TTL/T12 < 5.0.

5. The optical imaging system of claim 1, wherein an edge thickness ET5 of the fifth lens and a center thickness CT5 of the fifth lens on an optical axis satisfy: 1.5 < ET5/CT5 < 2.5.

6. The optical imaging system of claim 1, wherein the edge thickness ET5 of the fifth lens and the on-axis distance SAG51 between the intersection point of the light-entrance-side surface of the fifth lens and the optical axis and the effective radius vertex of the light-entrance-side surface of the fifth lens satisfy: 6.5 < ET5/SAG51 < -1.5.

7. The optical imaging system of claim 1, wherein the central thickness CT4 of the fourth lens on the optical axis and the on-axis distance SAG42 between the intersection point of the optical axis and the surface of the fourth lens facing the light-emitting side and the optical axis satisfy: 2.5 < CT4/SAG42 < -1.5.

8. The optical imaging system of claim 1, wherein a center thickness CT3 of the third lens on an optical axis and a center thickness CT2 of the second lens on the optical axis satisfy: 1.0 < CT3/CT2 < 2.0.

9. The optical imaging system of claim 1, wherein the air space T12 of the first lens and the second lens on the optical axis, the central thickness CT1 of the first lens on the optical axis satisfies: T12/CT1 is more than 3.0 and less than 6.0.

10. An optical imaging system, comprising, in order from an incident side to an outgoing side of the optical imaging system:

a first lens element with negative refractive power;

a fourth lens element with refractive power;

a fifth lens element with refractive power;

wherein the combined focal length f45 of the fourth lens and the fifth lens and the effective focal length f of the optical imaging system satisfy the following condition: f45/f is more than 0.5 and less than 1.5.