CN216411823U

CN216411823U - Optical imaging system

Info

Publication number: CN216411823U
Application number: CN202123004108.2U
Authority: CN
Inventors: 戴付建; 孙叶萍; 徐武超; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-12-01
Filing date: 2021-12-01
Publication date: 2022-04-29
Anticipated expiration: 2031-12-01

Abstract

The utility model provides an optical imaging system. The optical imaging system sequentially comprises from the object side to the imaging side along the optical axis: the first lens comprises a first transmission surface, a first reflection surface, a second reflection surface and a second transmission surface, the first transmission surface is positioned on the outer circumference of the object side surface of the first lens, the first reflection surface is positioned on the outer circumference of the imaging side surface of the first lens, the second reflection surface is positioned in the paraxial region of the object side surface of the first lens, and the second transmission surface is positioned in the paraxial region of the imaging side surface of the first lens; a second lens having a negative focal power; a third lens having optical power; a fourth lens having a positive refractive power; a fifth lens having optical power; a sixth lens having a negative focal power; wherein the full field angle FOV of the optical imaging system satisfies: 10 ° < FOV <20 °. The utility model solves the problem that the optical imaging system in the prior art is difficult to simultaneously give consideration to both long focus and ultrathin.

Description

Optical imaging system

Technical Field

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

Background

With the rapid development of scientific technology and the popularization of portable electronic products such as mobile phones and tablet computers, optical imaging systems suitable for the portable electronic products are changing day by day, and the requirements of people on the imaging quality and the performance of each aspect are higher and higher. Meanwhile, users are more and more interested in the double-shot and triple-shot technologies, which generally require a telephoto lens to obtain a higher spatial angular resolution. In order to meet the market demand, the optical imaging system needs as many lenses as possible to increase the degree of freedom of design and improve the imaging quality, but the total length of the telephoto lens system is easily too long, which is not beneficial to the ultra-thinning of the optical imaging system applied to the mobile phone and easily affects the appearance of the mobile phone lens.

That is, the optical imaging system in the prior art has the problem that both the long focus and the ultra-thin are difficult to be compatible.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide an optical imaging system to solve the problem that the optical imaging system in the prior art is difficult to simultaneously take long focus and ultrathin into account.

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 an object side to an imaging side along an optical axis: the first lens comprises a first transmission surface, a first reflection surface, a second reflection surface and a second transmission surface, the first transmission surface is positioned on the outer circumference of the object side surface of the first lens, the first reflection surface is positioned on the outer circumference of the imaging side surface of the first lens, the second reflection surface is positioned in the paraxial region of the object side surface of the first lens, and the second transmission surface is positioned in the paraxial region of the imaging side surface of the first lens; a second lens having a negative focal power; a third lens having optical power; a fourth lens having a positive refractive power; a fifth lens having optical power; a sixth lens having a negative focal power; wherein the full field angle FOV of the optical imaging system satisfies: 10 ° < FOV <20 °.

Further, the total system length TTL of the optical imaging system and the effective focal length f of the optical imaging system satisfy the following conditions: TTL/f < 0.6.

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 < 2.65.

Further, the total system length TTL of the optical imaging system and the on-axis distance BFL from the imaging side surface of the sixth lens element to the imaging surface satisfy: 6.8< TTL/BFL < 7.6.

Further, the effective focal length f6 of the sixth lens and the effective focal length f2 of the second lens satisfy: 0.3< f6/f2< 1.6.

Further, the radius of curvature R4 of the imaging side of the second lens and the radius of curvature R3 of the object side of the second lens satisfy: 1.0< (R4+ R3)/(R4-R3) < 2.1.

Further, a radius of curvature R5 of the object side surface of the third lens and a radius of curvature R6 of the imaging side surface of the third lens satisfy: 0.2< R6/R5< 1.2.

Further, the effective focal length f4 of the fourth lens and the curvature radius R8 of the imaging side surface of the fourth lens satisfy: -3.3< f4/R8< -1.6.

Further, a radius of curvature R10 of the image-side surface of the fifth lens, a radius of curvature R11 of the object-side surface of the sixth lens, and a radius of curvature R9 of the object-side surface of the fifth lens satisfy: 0.8< (R10+ R11)/R9< 1.6.

Further, a composite focal length f23 of the second lens and the third lens, a center thickness CT2 of the second lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy: -10.3< f23/(CT2+ CT3) < -4.3.

Further, the central thickness CT4 of the fourth lens, the central thickness CT5 of the fifth lens, the edge thickness ET4 of the fourth lens and the edge thickness ET5 of the fifth lens satisfy: 1.0< (CT4+ CT5)/(ET4+ ET5) < 1.7.

Further, the first reflecting surface and the second reflecting surface are total reflecting surfaces.

Furthermore, the first reflecting surface and the second reflecting surface are both provided with a total reflection film layer.

According to another aspect of the present invention, there is provided an optical imaging system including, in order from an object side to an imaging side along an optical axis: the first lens comprises a first transmission surface, a first reflection surface, a second reflection surface and a second transmission surface, the first transmission surface is positioned on the outer circumference of the object side surface of the first lens, the first reflection surface is positioned on the outer circumference of the imaging side surface of the first lens, the second reflection surface is positioned in the paraxial region of the object side surface of the first lens, and the second transmission surface is positioned in the paraxial region of the imaging side surface of the first lens; a second lens having a negative focal power; a third lens having optical power; a fourth lens having a positive refractive power; a fifth lens having optical power; a sixth lens having a negative focal power; the optical imaging system has a total system length TTL and an on-axis distance BFL from an imaging side surface of the sixth lens to an imaging surface, and the total system length TTL and the on-axis distance BFL satisfy the following conditions: 6.8< TTL/BFL < 7.6.

Further, the total system length TTL of the optical imaging system and the effective focal length f of the optical imaging system satisfy the following conditions: TTL/f is less than 0.6; the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD < 2.65.

Further, the full field angle FOV of the optical imaging system satisfies: 10 ° < FOV <20 °; the effective focal length f6 of the sixth lens and the effective focal length f2 of the second lens satisfy that: 0.3< f6/f2< 1.6.

By applying the technical scheme of the utility model, the optical imaging system sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the object side to the imaging side along the optical axis, wherein the first lens comprises a first transmission surface, a first reflection surface, a second reflection surface and a second transmission surface; the second lens has negative focal power; the third lens has focal power; the fourth lens has positive focal power; the fifth lens has focal power; the sixth lens has negative focal power; wherein the full field angle FOV of the optical imaging system satisfies: 10 ° < FOV <20 °.

Through the special structural design of the first lens, light on the object side enters from the first transmission surface, is reflected to the second reflection surface through the first reflection surface, is reflected to the second transmission surface through the second reflection surface and then enters a rear system, so that the transmission path of the light on the first lens is effectively planned, and the use reliability of the first lens is improved; through the focal power of each lens of rational distribution, be favorable to guaranteeing the long burnt characteristic of optical imaging system, set up two plane of reflection through first lens, increased the transmission of light in first lens, can effectively shorten optical imaging system's system length when guaranteeing long burnt characteristics to guarantee frivolousization. The characteristic of long focus of the system can be better realized by reasonably restricting the full field angle FOV of the optical imaging system.

Drawings

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

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

FIGS. 2 to 4 show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve of the optical imaging system of 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 astigmatism curve, and a distortion curve of the optical imaging system in fig. 5, respectively;

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 astigmatism curve, and a distortion curve of the optical imaging system in fig. 9, respectively;

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 astigmatism curve, and a distortion curve of the optical imaging system in fig. 13, respectively;

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 astigmatism curve, and a distortion curve of the optical imaging system in fig. 17, respectively;

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 astigmatism curve, and a distortion curve of the optical imaging system in fig. 21, respectively.

Wherein the figures include the following reference numerals:

e1, first lens; s11, a first transmission surface; s21, a first reflecting surface; s12, a second reflecting surface; s22, a second transmission surface; e2, second lens; s3, an object side surface of the second lens; s4, the imaging side surface of the second lens; e3, third lens; s5, an object side surface of the third lens; s6, the imaging side surface of the third lens; e4, fourth lens; s7, an object side surface of the fourth lens; s8, the imaging side surface of the fourth lens; e5, fifth lens; s9, an object side surface of the fifth lens; s10, the imaging side surface of the fifth lens; e6, sixth lens; s11, the object side surface of the sixth lens; s12, an imaging side of the sixth lens; e7, optical filters; s13, the object side of the optical filter; s14, imaging side face of the optical filter; and S15, 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 utility model.

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 object side surface of the lens, and the surface of each lens close to the image side is called the image side surface of the lens. 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. When the R value is positive, the object side is judged to be convex, and when the R value is negative, the object side is judged to be concave; for the imaged side, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

The utility model provides an optical imaging system, aiming at solving the problem that the optical imaging system in the prior art is difficult to simultaneously give consideration to long focus and ultrathin.

Example one

As shown in fig. 1 to 24, the optical imaging system includes, in order from an object side to an imaging side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, the first lens includes a first transmission surface, a first reflection surface, a second reflection surface, and a second transmission surface, the first transmission surface is located at an outer circumference of an object side surface of the first lens, the first reflection surface is located at an outer circumference of an imaging side surface of the first lens, the second reflection surface is located in a paraxial region of the object side surface of the first lens, and the second transmission surface is located in a paraxial region of the imaging side surface of the first lens; the second lens has negative focal power; the third lens has focal power; the fourth lens has positive focal power; the fifth lens has focal power; the sixth lens has negative focal power; wherein the full field angle FOV of the optical imaging system satisfies: 10 ° < FOV <20 °.

Preferably, 15 ° < FOV <17 °.

In addition, the optical imaging system is a six-piece refraction and reflection long-focus system, and more design freedom degrees are adopted, so that the total length of the system can be greatly shortened while long focus is realized, and the characteristic of miniaturization is met.

In the embodiment, the total system length TTL of the optical imaging system and the effective focal length f of the optical imaging system satisfy: TTL/f < 0.6. The ratio of the total system length TTL of the optical imaging system to the effective focal length f of the optical imaging system is restrained within a reasonable range, so that the characteristic of short TTL is favorably realized, and the requirement of miniaturization is met.

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 < 2.65. The characteristic of large aperture of the optical imaging system can be realized by restricting the ratio of the effective focal length F of the optical imaging system to the entrance pupil diameter EPD of the optical imaging system within a reasonable range, so that the F number of the system is less than 2.65. Preferably, f/EPD < 2.60.

In this embodiment, the total system length TTL of the optical imaging system and the on-axis distance BFL from the imaging side surface of the sixth lens element to the imaging surface satisfy: 6.8< TTL/BFL < 7.6. The ratio of the total system length TTL of the optical imaging system to the axial distance BFL from the imaging side surface of the sixth lens to the imaging surface is restrained within a reasonable range, so that the characteristic of long focus is favorably ensured. Preferably, 7.0< TTL/BFL < 7.4.

In the present embodiment, the effective focal length f6 of the sixth lens and the effective focal length f2 of the second lens satisfy: 0.3< f6/f2< 1.6. The optical power of the system can be reasonably distributed when the conditional expression is satisfied, so that the positive spherical aberration and the negative spherical aberration of the front group lens and the rear group lens can be mutually offset. Preferably 0.4< f6/f2< 1.5.

In the present embodiment, the radius of curvature R4 of the imaging side surface of the second lens and the radius of curvature R3 of the object side surface of the second lens satisfy: 1.0< (R4+ R3)/(R4-R3) < 2.1. The refraction angle of the system light on the second lens can be effectively controlled by satisfying the conditional expression, and the good processing characteristic of the system is realized. Preferably, 1.0< (R4+ R3)/(R4-R3) < 2.0.

In the present embodiment, a radius of curvature R5 of the object side surface of the third lens and a radius of curvature R6 of the imaging side surface of the third lens satisfy: 0.2< R6/R5< 1.2. The condition is satisfied, the sensitivity of the third lens can be effectively reduced, and the processing and forming characteristics of the third lens can be guaranteed. Preferably 0.5< R6/R5< 1.1.

In the present embodiment, the effective focal length f4 of the fourth lens and the radius of curvature R8 of the imaging side surface of the fourth lens satisfy: -3.3< f4/R8< -1.6. The conditional expression is satisfied, so that the field curvature contribution amount of the imaging side surface of the fourth lens is in a reasonable range, and the field curvature amounts generated by other lenses are balanced. Preferably, -3.2< f4/R8< -1.7.

In the present embodiment, a radius of curvature R10 of the imaging-side surface of the fifth lens, a radius of curvature R11 of the object-side surface of the sixth lens, and a radius of curvature R9 of the object-side surface of the fifth lens satisfy: 0.8< (R10+ R11)/R9< 1.6. The system can better realize the deflection of the optical path and balance the high-grade spherical aberration generated by the system by meeting the conditional expression. Preferably, 1.0< (R10+ R11)/R9< 1.5.

In the present embodiment, the combined focal length f23 of the second lens and the third lens, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis satisfy: -10.3< f23/(CT2+ CT3) < -4.3. Satisfying the conditional expression, the performance of the coma aberration of the system can be reasonably controlled, and the system has good optical performance. Preferably, -10.3< f23/(CT2+ CT3) < -4.4.

In the present embodiment, the center thickness CT4 of the fourth lens, the center thickness CT5 of the fifth lens, the edge thickness ET4 of the fourth lens, and the edge thickness ET5 of the fifth lens satisfy: 1.0< (CT4+ CT5)/(ET4+ ET5) < 1.7. The conditional expression is satisfied, so that the field curvature contribution of each field of the system is controlled within a reasonable range, the field curvature generated by other lenses is balanced, and the resolution is effectively improved. Preferably, 1.1< (CT4+ CT5)/(ET4+ ET5) < 1.7.

In this embodiment, the first reflecting surface and the second reflecting surface are total reflecting surfaces. That is to say, first plane of reflection and second plane of reflection have the total reflection effect, through the total reflection scope of reasonable first plane of reflection and second plane of reflection of setting up, can effectively shorten the total length of system when satisfying the long burnt.

In this embodiment, the first reflective surface and the second reflective surface are both provided with a total reflection film layer. Through plating the total reflection film layers on the first reflecting surface and the second reflecting surface, the two reflections of the first lens can be realized, and the purpose of shortening the total length of the long-focus system is achieved.

Example two

As shown in fig. 1 to 24, the optical imaging system includes, in order from an object side to an imaging side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, the first lens includes a first transmission surface, a first reflection surface, a second reflection surface, and a second transmission surface, the first transmission surface is located at an outer circumference of an object side surface of the first lens, the first reflection surface is located at an outer circumference of an imaging side surface of the first lens, the second reflection surface is located in a paraxial region of the object side surface of the first lens, and the second transmission surface is located in a paraxial region of the imaging side surface of the first lens; the second lens has negative focal power; the third lens has focal power; the fourth lens has positive focal power; the fifth lens has focal power; the sixth lens has negative focal power; the optical imaging system has a total system length TTL and an on-axis distance BFL from an imaging side surface of the sixth lens to an imaging surface, and the total system length TTL and the on-axis distance BFL satisfy the following conditions: 6.8< TTL/BFL < 7.6.

Preferably, 7.0< TTL/BFL < 7.4.

Through the special structural design of the first lens, light on the object side enters from the first transmission surface, is reflected to the second reflection surface through the first reflection surface, is reflected to the second transmission surface through the second reflection surface and then enters a rear system, so that the transmission path of the light on the first lens is effectively planned, and the use reliability of the first lens is improved; through the focal power of each lens of rational distribution, be favorable to guaranteeing the long burnt characteristic of optical imaging system, set up two plane of reflection through first lens, increased the transmission of light in first lens, can effectively shorten optical imaging system's system length when guaranteeing long burnt characteristics to guarantee frivolousization. The ratio of the total system length TTL of the optical imaging system to the axial distance BFL from the imaging side surface of the sixth lens to the imaging surface is restrained within a reasonable range, so that the characteristic of long focus is favorably ensured.

In the present embodiment, the full field angle FOV of the optical imaging system satisfies: 10 ° < FOV <20 °. The characteristic of long focus of the system can be better realized by reasonably restricting the full field angle FOV of the optical imaging system. Preferably, 15 ° < FOV <17 °.

The above optical imaging system may optionally further include a filter for correcting color deviation or a protective glass for protecting the photosensitive element on the imaging surface.

The optical imaging system in the present application may employ a plurality of lenses, such as the six lenses described above. By reasonably distributing the focal 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. The left side is the object side and the right side is the imaging side.

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 six lenses are exemplified in the embodiment, the optical imaging system is not limited to including six 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 an object side to an imaging side: the lens system comprises a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

The first lens E1 has positive refractive power, the second reflective surface S12 of the first lens is concave, and the second transmissive surface S22 of the first lens is convex. The second lens E2 has negative refractive power, and the object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a convex surface. The third lens E3 has positive refractive power, and the object-side surface S5 of the third lens is a convex surface and the image-side surface S6 of the third lens is a concave surface. The fourth lens E4 has positive refractive power, and the object-side surface S7 of the fourth lens is a concave surface and the image-side surface S8 of the fourth lens is a convex surface. The fifth lens E5 has positive refractive power, and the object side surface S9 of the fifth lens is a concave surface and the image side surface S10 of the fifth lens is a convex surface. The sixth lens E6 has negative refractive power, and the object side surface S11 of the sixth lens is a concave surface, and the image side surface S12 of the sixth lens is a concave surface. The filter E7 has a filter object side surface S13 and a filter image side surface S14. The first lens E1 further has a first transmission surface S11 and a first reflection surface S21. The light from the object side sequentially passes through the respective surfaces S11 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical imaging system is 15.00mm, the full field angle FOV of the optical imaging system is 15.3 °, the total system length TTL of the optical imaging system is 6.09mm, and the image height ImgH is 2.04 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, the object-side surface and the image-side surface of any one of the first reflecting surface S21 of the first lens and the image-side surface S12 of the sixth lens are aspheric, and the surface type 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 coefficients a4, a6, A8, a10, a12, a14 that can be used for each aspherical mirror in example one.

Flour mark

A4

A6

A8

A10

A12

A14

S21

6.9785E-04

8.4753E-06

1.9044E-07

1.7332E-09

2.0133E-10

0.0000E+00

S12

1.8580E-02

-1.7690E-03

5.0193E-04

-4.9851E-05

0.0000E+00

S22(STO)

6.9785E-04

8.4753E-06

1.9044E-07

1.7332E-09

2.0133E-10

0.0000E+00

S3

9.1147E-01

-1.7987E+00

3.4820E+00

-4.7796E+00

3.9754E+00

-1.4755E+00

S4

7.0026E-01

-1.4132E+00

1.8098E+00

-1.5082E+00

2.0393E-01

0.0000E+00

S5

-4.5831E-01

-1.3957E-01

7.5082E-02

-3.2560E-02

9.0854E-17

0.0000E+00

S6

-3.9960E-01

-1.3093E-02

1.5809E-01

1.4057E-01

-4.3555E-16

0.0000E+00

S7

5.3046E-02

-3.1245E-01

5.1453E-01

-3.0667E-01

4.3712E-09

0.0000E+00

S8

-1.8614E-01

3.0365E-01

-1.6387E-01

2.8339E-02

-4.5417E-07

0.0000E+00

S9

-3.2134E-01

3.1481E-01

-1.5534E-01

2.8806E-02

-3.1099E-07

0.0000E+00

S10

-9.3351E-02

5.1488E-02

-9.3510E-03

1.8889E-03

-4.4831E-04

0.0000E+00

S11

-2.7684E-02

2.6121E-02

1.4405E-02

-7.2288E-03

9.2936E-04

0.0000E+00

S12

-1.3808E-01

5.5985E-02

-1.8899E-02

2.7980E-03

-1.0907E-04

0.0000E+00

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 distortion curves of the optical imaging system of example one, which represent distortion magnitude values corresponding to different angles of view.

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 an object side to an imaging side: the lens system comprises a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

The first lens E1 has positive refractive power, the second reflective surface S12 of the first lens is concave, and the second transmissive surface S22 of the first lens is convex. The second lens E2 has negative refractive power, and the object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a convex surface. The third lens E3 has positive refractive power, and the object-side surface S5 of the third lens is a convex surface and the image-side surface S6 of the third lens is a concave surface. The fourth lens E4 has positive refractive power, and the object-side surface S7 of the fourth lens is a concave surface and the image-side surface S8 of the fourth lens is a convex surface. The fifth lens E5 has negative power, and the object side surface S9 of the fifth lens is a concave surface and the image side surface S10 of the fifth lens is a convex surface. The sixth lens E6 has negative refractive power, and the object side surface S11 of the sixth lens is a concave surface, and the image side surface S12 of the sixth lens is a concave surface. The filter E7 has a filter object side surface S13 and a filter image side surface S14. The first lens E1 further has a first transmission surface S11 and a first reflection surface S21. The light from the object side sequentially passes through the respective surfaces S11 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical imaging system is 14.73mm, the full field angle FOV of the optical imaging system is 16.0 °, the total system length TTL of the optical imaging system is 6.03mm, and the image height ImgH is 2.15 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

S21

6.6785E-04

8.2797E-06

1.8092E-07

2.6806E-09

1.8371E-10

0.0000E+00

S12

1.5357E-02

-1.5091E-03

3.9133E-04

-3.1478E-05

0.0000E+00

S22(STO)

6.6785E-04

8.2797E-06

1.8092E-07

2.6806E-09

1.8371E-10

0.0000E+00

S3

8.2253E-01

-1.4675E+00

2.7563E+00

-3.6959E+00

2.9957E+00

-1.0327E+00

S4

6.2494E-01

-1.2723E+00

1.8417E+00

-2.0017E+00

7.3142E-01

0.0000E+00

S5

-5.0156E-01

-9.9594E-02

1.8334E-01

-4.1531E-02

-8.2791E-16

0.0000E+00

S6

-4.1726E-01

6.7185E-02

2.0460E-01

1.2886E-01

-1.3308E-15

0.0000E+00

S7

6.4028E-02

-2.9762E-01

4.6981E-01

-3.0522E-01

4.3712E-09

0.0000E+00

S8

-1.0972E-01

2.8243E-01

-1.7095E-01

3.0576E-02

-4.5417E-07

0.0000E+00

S9

-3.1621E-01

2.8206E-01

-1.5646E-01

3.3785E-02

-3.1099E-07

0.0000E+00

S10

-1.2871E-01

5.4249E-02

-9.0440E-03

1.8294E-03

-4.4831E-04

0.0000E+00

S11

-8.2142E-03

4.6704E-02

6.0603E-03

-8.0516E-03

1.4599E-03

0.0000E+00

S12

-1.5076E-01

7.6458E-02

-2.8628E-02

5.2126E-03

-3.6921E-04

0.0000E+00

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 distortion curves of the optical imaging system of example two, which indicate distortion magnitude values corresponding to different angles of view.

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 an object side to an imaging side: the lens system comprises a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

The first lens E1 has positive refractive power, the second reflective surface S12 of the first lens is concave, and the second transmissive surface S22 of the first lens is convex. The second lens E2 has negative refractive power, and the object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a convex surface. The third lens E3 has negative power, and the object-side surface S5 of the third lens is a convex surface and the image-side surface S6 of the third lens is a concave surface. The fourth lens E4 has positive refractive power, and the object-side surface S7 of the fourth lens is a concave surface and the image-side surface S8 of the fourth lens is a convex surface. The fifth lens E5 has positive refractive power, and the object side surface S9 of the fifth lens is a concave surface and the image side surface S10 of the fifth lens is a convex surface. The sixth lens E6 has negative refractive power, and the object side surface S11 of the sixth lens is a concave surface, and the image side surface S12 of the sixth lens is a concave surface. The filter E7 has a filter object side surface S13 and a filter image side surface S14. The first lens E1 further has a first transmission surface S11 and a first reflection surface S21. The light from the object side sequentially passes through the respective surfaces S11 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical imaging system is 15.07mm, the full field angle FOV of the optical imaging system is 15.9 °, the total system length TTL of the optical imaging system is 6.16mm, and the image height ImgH is 2.15 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.

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 distortion curves of the optical imaging system of example three, which represent distortion magnitude values corresponding to different angles of view.

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 an object side to an imaging side: the lens system comprises a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

The first lens E1 has positive refractive power, the second reflective surface S12 of the first lens is concave, and the second transmissive surface S22 of the first lens is convex. The second lens E2 has negative refractive power, and the object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a convex surface. The third lens E3 has negative power, and the object-side surface S5 of the third lens is a convex surface and the image-side surface S6 of the third lens is a concave surface. The fourth lens E4 has positive refractive power, and the object-side surface S7 of the fourth lens is a concave surface and the image-side surface S8 of the fourth lens is a convex surface. The fifth lens E5 has positive refractive power, and the object side surface S9 of the fifth lens is a concave surface and the image side surface S10 of the fifth lens is a convex surface. The sixth lens E6 has negative refractive power, and the object side surface S11 of the sixth lens is a concave surface and the image side surface S12 of the sixth lens is a convex surface. The filter E7 has a filter object side surface S13 and a filter image side surface S14. The first lens E1 further has a first transmission surface S11 and a first reflection surface S21. The light from the object side sequentially passes through the respective surfaces S11 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical imaging system is 15.01mm, the full field angle FOV of the optical imaging system is 16.2 °, the total system length TTL of the optical imaging system is 6.70mm, and the image height ImgH is 2.15 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.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S21

5.6986E-04

6.3811E-06

1.4872E-07

1.8032E-09

6.0104E-11

0.0000E+00

S12

1.4465E-02

-9.2418E-04

4.0224E-04

-4.3777E-05

-2.4039E-06

-3.3965E-12

-2.4080E-13

S22(STO)

5.6986E-04

6.3811E-06

1.4872E-07

1.8032E-09

6.0104E-11

0.0000E+00

S3

7.6031E-01

-1.3828E+00

1.6091E+00

1.9305E+00

-1.3747E+01

3.0042E+01

-3.4889E+01

S4

6.2908E-01

-1.4857E+00

3.4801E+00

-9.0220E+00

1.8377E+01

-2.6110E+01

2.3163E+01

S5

-4.3112E-01

5.3591E-01

-4.6253E+00

2.5929E+01

-9.2564E+01

2.0569E+02

-2.7626E+02

S6

-4.1772E-01

5.0220E-01

-1.8943E+00

7.2351E+00

-1.9521E+01

3.4628E+01

-3.7950E+01

S7

-8.6288E-03

-2.6803E-02

1.9456E-01

-3.8136E-01

4.1864E-01

-2.8536E-01

1.1865E-01

S8

-2.1655E-01

5.2795E-01

-7.7502E-01

9.3802E-01

-8.1930E-01

4.7288E-01

-1.6693E-01

S9

-2.0376E-01

2.1554E-01

-2.7556E-01

3.9678E-01

-4.6405E-01

3.3438E-01

-1.3640E-01

S10

4.1592E-02

-4.4702E-01

8.8785E-01

-9.3736E-01

5.9128E-01

-2.2888E-01

5.3339E-02

S11

4.4961E-02

-7.1144E-01

2.0133E+00

-3.0698E+00

3.2615E+00

-2.6643E+00

1.7328E+00

S12

-9.7071E-02

-1.1594E-01

3.0360E-01

-3.2013E-01

2.1587E-01

-1.3649E-01

1.0717E-01

Flour mark

A18

A20

A22

A24

A26

A28

A30

S21

0.0000E+00

S12

-1.7054E-14

-1.2076E-15

0.0000E+00

S22(STO)

0.0000E+00

S3

2.1319E+01

-5.3611E+00

0.0000E+00

S4

-1.2057E+01

3.1896E+00

0.0000E+00

S5

2.0413E+02

-6.3140E+01

0.0000E+00

S6

2.3350E+01

-6.1262E+00

0.0000E+00

S7

-2.7729E-02

2.8186E-03

0.0000E+00

S8

3.2009E-02

-2.5176E-03

0.0000E+00

S9

2.9014E-02

-2.5024E-03

0.0000E+00

S10

-6.8752E-03

3.7672E-04

0.0000E+00

S11

-8.9136E-01

3.5284E-01

-1.0375E-01

2.1702E-02

-3.0341E-03

2.5321E-04

-9.5161E-06

S12

-7.9506E-02

4.2900E-02

-1.5684E-02

3.7901E-03

-5.8051E-04

5.1085E-05

-1.9679E-06

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 distortion curves of the optical imaging system of example four, which represent distortion magnitude values corresponding to different angles of view.

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 an object side to an imaging 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 sixth lens E6, a filter E7, and an image forming surface S15.

The first lens E1 has positive refractive power, the second reflective surface S12 of the first lens is concave, and the second transmissive surface S22 of the first lens is convex. The second lens E2 has negative refractive power, and the object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a convex surface. The third lens E3 has negative power, and the object-side surface S5 of the third lens is a convex surface and the image-side surface S6 of the third lens is a concave surface. The fourth lens E4 has positive refractive power, and the object-side surface S7 of the fourth lens is a convex surface, and the image-side surface S8 of the fourth lens is a convex surface. The fifth lens E5 has positive refractive power, and the object side surface S9 of the fifth lens is a concave surface and the image side surface S10 of the fifth lens is a convex surface. The sixth lens E6 has negative refractive power, and the object side surface S11 of the sixth lens is a concave surface, and the image side surface S12 of the sixth lens is a concave surface. The filter E7 has a filter object side surface S13 and a filter image side surface S14. The first lens E1 further has a first transmission surface S11 and a first reflection surface S21. The light from the object side sequentially passes through the respective surfaces S11 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical imaging system is 15.00mm, the full field angle FOV of the optical imaging system is 16.2 °, the total system length TTL of the optical imaging system is 6.70mm, and the image height ImgH is 2.15 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

S21

5.6678E-04

5.8080E-06

1.5705E-07

6.5357E-10

8.8466E-11

0.0000E+00

S12

1.4092E-02

-1.0245E-03

3.8766E-04

-4.4006E-05

-6.3914E-08

-2.2416E-07

-7.8740E-08

S22

5.6678E-04

5.8080E-06

1.5705E-07

6.5357E-10

8.8466E-11

0.0000E+00

S3

8.3751E-01

-1.1389E+00

-3.4117E+00

2.8460E+01

-9.0776E+01

1.6546E+02

-1.7784E+02

S4

8.6613E-01

-2.5882E+00

5.2294E+00

-8.2687E+00

9.1587E+00

-7.8820E+00

5.8175E+00

S5

-2.8568E-01

-2.2565E-02

-3.7566E+00

2.2794E+01

-7.5544E+01

1.5215E+02

-1.8663E+02

S6

-4.3390E-01

3.8415E-01

-1.6419E+00

5.2535E+00

-1.1777E+01

1.8282E+01

-1.7883E+01

S7

-3.2843E-02

-1.2996E-01

6.6680E-01

-1.9177E+00

3.1340E+00

-2.8913E+00

1.4883E+00

S8

-3.6053E-01

1.2530E+00

-2.4862E+00

2.4124E+00

1.5353E+00

-8.5704E+00

1.3191E+01

S9

-3.9429E-01

1.0324E+00

-2.0999E+00

2.8156E+00

-2.4875E+00

1.4285E+00

-5.1048E-01

S10

-2.2651E-02

-3.2856E-02

-9.5940E-02

2.4079E-01

-2.1897E-01

1.0651E-01

-2.9288E-02

S11

-4.1069E-03

-1.7795E-01

4.4836E-01

-1.0084E+00

2.0863E+00

-3.0173E+00

2.9695E+00

S12

-1.5416E-01

1.2144E-01

-2.5051E-01

4.2416E-01

-4.4988E-01

2.9530E-01

-1.0807E-01

Flour mark

A18

A20

A22

A24

A26

A28

A30

S21

0.0000E+00

S12

2.4521E-08

1.4480E-08

0.0000E+00

S22

0.0000E+00

S3

1.0412E+02

-2.5345E+01

0.0000E+00

S4

-3.3984E+00

1.1639E+00

0.0000E+00

S5

1.2855E+02

-3.7799E+01

0.0000E+00

S6

9.8837E+00

-2.3397E+00

0.0000E+00

S7

-3.9938E-01

4.3698E-02

0.0000E+00

S8

-1.1499E+01

6.1987E+00

-2.0464E+00

3.7996E-01

-3.0436E-02

0.0000E+00

S9

1.0267E-01

-8.8430E-03

0.0000E+00

S10

4.2864E-03

-2.5960E-04

0.0000E+00

S11

-2.0283E+00

9.7189E-01

-3.2539E-01

7.4495E-02

-1.1108E-02

9.7198E-04

-3.7859E-05

S12

7.0444E-03

1.4003E-02

-7.7851E-03

2.1295E-03

-3.3700E-04

2.9464E-05

-1.1058E-06

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 distortion curves of the optical imaging system of example five, which represent distortion magnitude values corresponding to different angles of view.

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 an object side to an imaging 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 sixth lens E6, a filter E7, and an image forming surface S15.

In this example, the total effective focal length f of the optical imaging system is 14.38mm, the full field angle FOV of the optical imaging system is 16.8 °, the total system length TTL of the optical imaging system is 6.70mm, and the image height ImgH is 2.15 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 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

S21

5.6714E-04

6.4762E-06

1.2606E-07

3.4537E-10

1.1896E-10

-4.9266E-14

-1.4550E-15

S12

1.5261E-02

-9.1361E-04

2.3413E-04

-2.3911E-05

2.0908E-06

-3.0033E-13

-2.3918E-13

S22

5.6714E-04

6.4762E-06

1.2606E-07

3.4537E-10

1.1896E-10

-4.9266E-14

-1.4550E-15

S3

7.5075E-01

8.8727E-01

-4.0579E+01

4.5440E+02

-3.2757E+03

1.6736E+04

-6.2555E+04

S4

7.3115E-01

-2.0428E+00

1.2230E+01

-1.5417E+02

1.5807E+03

-1.1062E+04

5.2959E+04

S5

-5.4065E-01

2.5371E+00

-2.5268E+01

1.6071E+02

-7.3686E+02

2.8873E+03

-1.0941E+04

S6

-4.8532E-01

6.0142E-01

-2.1599E+00

1.8479E+01

-1.8064E+02

1.1777E+03

-4.9445E+03

S7

-6.1671E-02

2.1878E-02

-4.6802E-01

2.3647E+00

-4.1534E+00

-3.6210E+00

3.4517E+01

S8

-3.4078E-01

1.3263E+00

-4.1865E+00

1.1534E+01

-2.5618E+01

4.3452E+01

-5.5044E+01

S9

-2.1531E-01

-1.5431E-01

1.6125E+00

-3.7848E+00

3.8843E+00

1.5011E-01

-6.0492E+00

S10

2.0280E-01

-2.1507E+00

6.9730E+00

-1.2815E+01

1.5434E+01

-1.3171E+01

8.4029E+00

S11

1.3727E-01

-1.9661E+00

6.6691E+00

-1.1538E+01

1.2140E+01

-8.1394E+00

3.3835E+00

S12

-1.5638E-01

-1.9726E-02

2.4194E-01

-2.5485E-01

-8.3972E-03

2.6283E-01

-2.9617E-01

Flour mark

A18

A20

A22

A24

A26

A28

A30

S21

5.3715E-17

1.2483E-17

0.0000E+00

S12

-1.6962E-14

-1.2018E-15

0.0000E+00

S22

5.3715E-17

1.2483E-17

0.0000E+00

S3

1.7302E+05

-3.5347E+05

5.2567E+05

-5.5209E+05

3.8718E+05

-1.6234E+05

3.0717E+04

S4

-1.7650E+05

4.1325E+05

-6.7710E+05

7.5994E+05

-5.5639E+05

2.3925E+05

-4.5798E+04

S5

3.7388E+04

-1.0012E+05

1.9280E+05

-2.5408E+05

2.1675E+05

-1.0777E+05

2.3711E+04

S6

1.3896E+04

-2.6807E+04

3.5695E+04

-3.2288E+04

1.8958E+04

-6.5193E+03

9.9670E+02

S7

-8.3951E+01

1.1781E+02

-1.0643E+02

6.2818E+01

-2.3429E+01

5.0100E+00

-4.6760E-01

S8

5.1692E+01

-3.5717E+01

1.7863E+01

-6.2658E+00

1.4559E+00

-2.0045E-01

1.2337E-02

S9

9.2364E+00

-7.9673E+00

4.4984E+00

-1.6926E+00

4.0928E-01

-5.7501E-02

3.5634E-03

S10

-4.1493E+00

1.6027E+00

-4.7591E-01

1.0394E-01

-1.5532E-02

1.4036E-03

-5.7430E-05

S11

-7.0678E-01

-5.5193E-02

8.4905E-02

-2.6645E-02

4.4023E-03

-3.9206E-04

1.4897E-05

S12

1.8222E-01

-7.2387E-02

1.9358E-02

-3.4731E-03

4.0142E-04

-2.7029E-05

8.0577E-07

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 distortion curves of the optical imaging system of example six, which represent distortion magnitude values corresponding to different angles of view.

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.

Table 13 table 14 gives effective focal lengths f of the optical imaging systems of example one to example six, effective focal lengths f1 to f6 of the respective lenses, and the like.

Example parameters	1	2	3	4	5	6
							f1(mm)	8.10	8.03	8.17	6.71	8.23	7.15
f2(mm)	-4.08	-5.26	-4.83	-2.66	-3.36	-3.01
							f3(mm)	53.03	206.35	-105.73	-32.75	-30.99	-9.75
f4(mm)	6.30	5.95	5.95	4.13	3.05	2.61
							f5(mm)	24.26	-173.47	87.72	31.89	823.12	131.56
f6(mm)	-2.45	-2.36	-2.41	-3.77	-2.74	-2.83
							f(mm)	15.00	14.73	15.07	15.01	15.00	14.38
TTL(mm)	6.09	6.03	6.16	6.70	6.70	6.70
							ImgH(mm)	2.04	2.15	2.15	2.15	2.15	2.15

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 object side to an imaging side along an optical axis:

a first lens including a first transmission surface, a first reflection surface, a second reflection surface, and a second transmission surface, the first transmission surface being located at an outer circumference of an object side surface of the first lens, the first reflection surface being located at an outer circumference of an image side surface of the first lens, the second reflection surface being located at a paraxial region of the object side surface of the first lens, the second transmission surface being located at a paraxial region of the image side surface of the first lens;

a second lens having a negative optical power;

a third lens having an optical power;

a fourth lens having a positive optical power;

a fifth lens having an optical power;

a sixth lens having a negative optical power;

wherein a full field angle FOV of the optical imaging system satisfies: 10 ° < FOV <20 °.

2. The optical imaging system of claim 1, wherein the total system length TTL of the optical imaging system and the effective focal length f of the optical imaging system satisfy: TTL/f < 0.6.

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 < 2.65.

4. The optical imaging system according to claim 1, wherein a total system length TTL of the optical imaging system and an on-axis distance BFL from an imaging side surface to an imaging surface of the sixth lens satisfy: 6.8< TTL/BFL < 7.6.

5. The optical imaging system of claim 1, wherein an effective focal length f6 of the sixth lens and an effective focal length f2 of the second lens satisfy: 0.3< f6/f2< 1.6.

6. The optical imaging system of claim 1, wherein a radius of curvature R4 of the imaging side of the second lens and a radius of curvature R3 of the object side of the second lens satisfy: 1.0< (R4+ R3)/(R4-R3) < 2.1.

7. The optical imaging system according to claim 1, wherein a radius of curvature R5 of an object-side surface of the third lens and a radius of curvature R6 of an imaging-side surface of the third lens satisfy: 0.2< R6/R5< 1.2.

8. The optical imaging system of claim 1, wherein an effective focal length f4 of the fourth lens and a radius of curvature R8 of an imaging side of the fourth lens satisfy: -3.3< f4/R8< -1.6.

9. The optical imaging system according to claim 1, wherein a radius of curvature R10 of an imaging-side surface of the fifth lens, a radius of curvature R11 of an object-side surface of the sixth lens, and a radius of curvature R9 of an object-side surface of the fifth lens satisfy: 0.8< (R10+ R11)/R9< 1.6.

10. The optical imaging system of claim 1, wherein a combined focal length f23 of the second and third lenses, a center thickness CT2 of the second lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy: -10.3< f23/(CT2+ CT3) < -4.3.

11. The optical imaging system of claim 1, wherein a center thickness CT4 of the fourth lens, a center thickness CT5 of the fifth lens, an edge thickness ET4 of the fourth lens, and an edge thickness ET5 of the fifth lens satisfy: 1.0< (CT4+ CT5)/(ET4+ ET5) < 1.7.

12. The optical imaging system of claim 1, wherein the first and second reflective surfaces are fully reflective surfaces.

13. The optical imaging system of claim 1, wherein a total reflection film layer is disposed on each of the first and second reflective surfaces.

14. An optical imaging system, comprising, in order from an object side to an imaging side along an optical axis:

a second lens having a negative optical power;

a third lens having an optical power;

a fourth lens having a positive optical power;

a fifth lens having an optical power;

a sixth lens having a negative optical power;

the total system length TTL of the optical imaging system and the axial distance BFL from the imaging side surface of the sixth lens to the imaging surface satisfy the following conditions: 6.8< TTL/BFL < 7.6.

15. The optical imaging system of claim 14, wherein the total system length TTL of the optical imaging system and the effective focal length f of the optical imaging system satisfy: TTL/f is less than 0.6; the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD < 2.65.

16. The optical imaging system of claim 14, wherein the full field angle FOV of the optical imaging system satisfies: 10 ° < FOV <20 °; an effective focal length f6 of the sixth lens and an effective focal length f2 of the second lens satisfy: 0.3< f6/f2< 1.6.

17. The optical imaging system of claim 14, wherein a radius of curvature R4 of the imaging side of the second lens and a radius of curvature R3 of the object side of the second lens satisfy: 1.0< (R4+ R3)/(R4-R3) < 2.1.

18. The optical imaging system of claim 14, wherein a radius of curvature R5 of the object-side surface of the third lens and a radius of curvature R6 of the imaging-side surface of the third lens satisfy: 0.2< R6/R5< 1.2.

19. The optical imaging system of claim 14, wherein an effective focal length f4 of the fourth lens and a radius of curvature R8 of an imaging side of the fourth lens satisfy: -3.3< f4/R8< -1.6.

20. The optical imaging system of claim 14, wherein a radius of curvature R10 of an imaging-side surface of the fifth lens, a radius of curvature R11 of an object-side surface of the sixth lens, and a radius of curvature R9 of an object-side surface of the fifth lens satisfy: 0.8< (R10+ R11)/R9< 1.6.

21. The optical imaging system of claim 14, wherein a combined focal length f23 of the second and third lenses, a center thickness CT2 of the second lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy: -10.3< f23/(CT2+ CT3) < -4.3.

22. The optical imaging system of claim 14, wherein a center thickness CT4 of the fourth lens, a center thickness CT5 of the fifth lens, an edge thickness ET4 of the fourth lens, and an edge thickness ET5 of the fifth lens satisfy: 1.0< (CT4+ CT5)/(ET4+ ET5) < 1.7.

23. The optical imaging system of claim 14, wherein the first and second reflective surfaces are fully reflective surfaces.

24. The optical imaging system of claim 14, wherein a total reflection film layer is disposed on each of the first and second reflective surfaces.