CN111175945A

CN111175945A - Optical imaging system

Info

Publication number: CN111175945A
Application number: CN202010118790.9A
Authority: CN
Inventors: 孟祥月; 宋立通; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2020-02-25
Filing date: 2020-02-25
Publication date: 2020-05-19
Also published as: CN113467051A; CN113467051B

Abstract

The application discloses an optical imaging system, which comprises in order from an object side to an image side along an optical axis: a first lens having a negative optical power; the second lens with positive focal power has a convex object-side surface and a convex image-side surface; a third lens having a negative optical power; a fourth lens having an optical power; a fifth lens having optical power; and a sixth lens having optical power. The total effective focal length f of the optical imaging system, the Semi-FOV which is half of the maximum field angle of the optical imaging system, and the combined focal length f234 of the second, third, and fourth lenses satisfy the following conditional expression: 3.20mm < f × tan (Semi-FOV) < 5.65 mm; f234/f is more than 0.5 and less than 3.0.

Description

Optical imaging system

Technical Field

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

Background

In recent years, with the rapid popularization of consumer electronics such as mobile phones, pads, VRs and the like, people have higher and higher requirements on lens imaging quality. For an intelligent device developer, in order to improve the competitiveness of the product thereof, in addition to electronic devices such as a CPU, a screen, and a memory, one or more high-quality lenses having characteristics of a large viewing range, a small size, high definition, and the like are configured, which must be considered by the device developer. The excellent imaging effect can bring excellent visual experience to users.

Reasonably coordinating lens parameters means better imaging results. For the field of optical system design, it is a not little challenge how to reasonably coordinate lens parameters.

Disclosure of Invention

An aspect of the present application provides an optical imaging system, in order from an object side to an image side along an optical axis, comprising: a first lens having a negative optical power; the second lens with positive focal power has a convex object-side surface and a convex image-side surface; a third lens having a negative optical power; a fourth lens having an optical power; a fifth lens having optical power; and a sixth lens having optical power.

In one embodiment, at least one mirror surface of the object side surface of the first lens to the image side surface of the sixth lens is an aspherical mirror surface.

In one embodiment, the total effective focal length f of the optical imaging system and half of the Semi-FOV of the maximum field angle of the optical imaging system may satisfy: 3.20mm < f × tan (Semi-FOV) < 5.65 mm.

In one embodiment, the total effective focal length f of the optical imaging system and the combined focal length f234 of the second, third, and fourth lenses may satisfy: f234/f is more than 0.5 and less than 3.0.

In one embodiment, the maximum field angle FOV of the optical imaging system may satisfy: FOV > 120.

In one embodiment, a distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the optical imaging system, a half ImgH of a diagonal length of the effective pixel area on the imaging surface of the optical imaging system, and a total effective focal length f of the optical imaging system may satisfy: TTL/ImgH multiplied by f is more than 4.0mm and less than 7.6 mm.

In one embodiment, the radius of curvature R5 of the object-side surface of the third lens, the radius of curvature R6 of the image-side surface of the third lens, and the total effective focal length f of the optical imaging system may satisfy: 2 < | (R5+ R6) |/f < 11.2.

In one embodiment, the effective focal length f4 of the fourth lens and half of the Semi-FOV of the maximum field angle of the optical imaging system may satisfy: 5.10mm < | f4| × tan (Semi-FOV) < 21.00 mm.

In one embodiment, the central thickness CT3 of the third lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis may satisfy: 1.0 < CT4/CT3 < 5.0.

In one embodiment, a distance SAG11 on the optical axis from the intersection point of the object-side surface of the first lens and the optical axis to the effective radius vertex of the object-side surface of the first lens and a distance SAG12 on the optical axis from the intersection point of the image-side surface of the first lens and the optical axis to the effective radius vertex of the image-side surface of the first lens may satisfy: 1.0 < SAG12/SAG11 < 2.5.

In one embodiment, a maximum value ET of edge thicknesses of the first to sixth lenses_MAXCan satisfy the following conditions: ET_MAX＜1.75mm。

In one embodiment, the central thickness CT5 of the fifth lens on the optical axis and the separation distance T56 of the fifth lens and the sixth lens on the optical axis may satisfy: 0.5 < CT5/T56 < 4.5.

In one embodiment, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens may satisfy: 3 < | f1/f2+ f3/f2| < 5.

In one embodiment, the radius of curvature R12 of the image-side surface of the sixth lens and the central thickness CT6 of the sixth lens on the optical axis satisfy: 0.80 < R12/CT6 < 3.4.

In one embodiment, a center thickness CT4 of the fourth lens on the optical axis and a sum Σ CT of center thicknesses of the first to sixth lenses on the optical axis may satisfy: 3.0 < sigma CT/CT4 < 7.0.

In one embodiment, the refractive index N3 of the third lens and the refractive index N6 of the sixth lens are both greater than 1.60.

In one embodiment, the abbe number V4 of the fourth lens may be greater than 45, and the abbe number V6 of the sixth lens may be less than 25.0.

In one embodiment, the optical imaging system may further include a diaphragm, and the diaphragm may be located between the first lens and the second lens.

The optical imaging system is applicable to portable electronic products and has small size and good imaging quality through reasonable distribution of focal power and optimization of optical parameters.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

fig. 1 shows a schematic configuration diagram of an optical imaging system according to embodiment 1 of the present application;

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

fig. 3 shows a schematic configuration diagram of an optical imaging system according to embodiment 2 of the present application;

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

fig. 5 shows a schematic configuration diagram of an optical imaging system according to embodiment 3 of the present application;

fig. 6A to 6C show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging system of embodiment 3;

fig. 7 shows a schematic configuration diagram of an optical imaging system according to embodiment 4 of the present application;

fig. 8A to 8C show an on-axis chromatic aberration curve, an astigmatism curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging system of embodiment 4;

fig. 9 shows a schematic configuration diagram of an optical imaging system according to embodiment 5 of the present application;

fig. 10A to 10C show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging system of embodiment 5;

fig. 11 shows a schematic configuration diagram of an optical imaging system according to embodiment 6 of the present application;

fig. 12A to 12C show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging system of embodiment 6;

fig. 13 is a schematic structural view showing an optical imaging system according to embodiment 7 of the present application;

fig. 14A to 14C show an on-axis chromatic aberration curve, an astigmatism curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging system of embodiment 7;

fig. 15 shows a schematic configuration diagram of an optical imaging system according to embodiment 8 of the present application;

fig. 16A to 16C show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging system of embodiment 8;

fig. 17 is a schematic structural view showing an optical imaging system according to embodiment 9 of the present application; and

fig. 18A to 18C show an on-axis chromatic aberration curve, an astigmatism curve, and a chromatic aberration of magnification curve, respectively, of an optical imaging system of example 9.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

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

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

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

It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

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

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

An optical imaging system according to an exemplary embodiment of the present application may include six lenses having optical powers, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, respectively. The six lenses are arranged along the optical axis in sequence from the object side to the image side. Any adjacent two lenses of the first lens to the sixth lens can have a spacing distance therebetween.

In an exemplary embodiment, the first lens may have a negative power; the second lens can have positive focal power, and the object side surface of the second lens can be a convex surface, and the image side surface of the second lens can be a convex surface; the third lens may have a negative optical power; the fourth lens may have a positive power or a negative power; the fifth lens may have a positive power or a negative power; the sixth lens may have a positive power or a negative power.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 3.20mm < f × tan (Semi-FOV) < 5.65mm, where f is the total effective focal length of the optical imaging system and the Semi-FOV is half the maximum field angle of the optical imaging system. The lens meets the requirements that f multiplied by tan (Semi-FOV) is more than 3.20mm and less than 5.65mm, is beneficial to balancing aberration, meets the requirements of ultra-wide angle and high image quality, can ensure smaller lens size and meets the requirement of miniaturization of the lens.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 0.5 < f234/f < 3.0, where f is the total effective focal length of the optical imaging system and f234 is the combined focal length of the second, third and fourth lenses. More specifically, f234 and f further satisfy: f234/f is more than 0.7 and less than 2.7. F234/f is more than 0.5 and less than 3.0, so that the aberration is balanced, the requirements of ultra-wide angle and high image quality are met, the size of a small lens can be ensured, and the miniaturization requirement of the lens is met.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: FOV >120 °, where FOV is the maximum field angle of the optical imaging system. Satisfying FOV >120 deg. is advantageous for obtaining more visual information.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 4.0mm < TTL/ImgH x f < 7.6mm, wherein TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical imaging system, ImgH is half of the length of the diagonal of the effective pixel area on the imaging surface of the optical imaging system, and f is the total effective focal length of the optical imaging system. The lens meets the requirements that TTL/ImgH multiplied by f is larger than 4.0mm and smaller than 7.6mm, the integral size and the image surface size of the lens are favorably controlled, and the miniaturization requirement is met.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 2 < | (R5+ R6) |/f < 11.2, wherein R5 is the radius of curvature of the object-side surface of the third lens, R6 is the radius of curvature of the image-side surface of the third lens, and f is the total effective focal length of the optical imaging system. More specifically, R5, R6, and f further may satisfy: 2.3 < | (R5+ R6) |/f < 11.2. Satisfy 2 < | (R5+ R6) |/f < 11.2, be favorable to better correction spherical aberration, and considered the processing technology problem, can effectively reduce the sensitivity of super wide angle lens processing and equipment.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 5.10mm < | f4| × tan (Semi-FOV) < 21.00mm, where f4 is the effective focal length of the fourth lens and the Semi-FOV is half the maximum field angle of the optical imaging system. Satisfies 5.10mm < | f4| × tan (Semi-FOV) < 21.00mm, and is beneficial to the correction of the distortion.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 1.0 < CT4/CT3 < 5.0, wherein CT3 is the central thickness of the third lens on the optical axis, and CT4 is the central thickness of the fourth lens on the optical axis. More specifically, CT4 and CT3 further satisfy: 1.2 < CT4/CT3 < 4.6. The requirements of 1.0 < CT4/CT3 < 5.0 are met, the manufacturability of lens processing is favorably ensured, and the aberration is favorably balanced.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 1.0 < SAG12/SAG11 < 2.5, wherein SAG11 is the distance on the optical axis from the intersection point of the object side surface of the first lens and the optical axis to the effective radius vertex of the object side surface of the first lens, and SAG12 is the distance on the optical axis from the intersection point of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens. More specifically, SAG12 and SAG11 further may satisfy: 1.2 < SAG12/SAG11 < 2.4. The requirement that SAG12/SAG11 is more than 1.0 and less than 2.5 is met, the manufacturability of the system is improved, the manufacturability and the whole imaging quality of the system are considered, the manufacturability is poor if the ratio is too large, and the correction of field curvature of an off-axis field is not facilitated if the ratio is too small.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: ET_MAX< 1.75mm, wherein ET_MAXIs the maximum value of the edge thicknesses of the first lens to the sixth lens. Satisfies ET_MAXLess than 1.75mm, is favorable for meeting the manufacturability requirement of processing and the miniaturization requirement of an optical system.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 0.5 < CT5/T56 < 4.5, wherein CT5 is the central thickness of the fifth lens on the optical axis, and T56 is the separation distance between the fifth lens and the sixth lens on the optical axis. The requirement of 0.5 < CT5/T56 < 4.5 is favorable for correcting aberration and reducing the sensitivity of ultra-wide angle lens assembly.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 3 < | f1/f2+ f3/f2| < 5, where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, and f3 is the effective focal length of the third lens. More specifically, f1, f2, and f3 may further satisfy: 3 < | f1/f2+ f3/f2| < 4.7. The requirement that 3 < | f1/f2+ f3/f2| < 5 is met, the method is favorable for reasonably distributing the focal power of each lens in the system, and reasonably shares the correction of spherical aberration, chromatic aberration of magnification and axial chromatic aberration, thereby improving the system performance.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 0.80 < R12/CT6 < 3.4, wherein R12 is a radius of curvature of an image-side surface of the sixth lens, and CT6 is a center thickness of the sixth lens on an optical axis. More specifically, R12 and CT6 further satisfy: 1.30 < R12/CT6 < 3.4. The optical lens meets the requirement that R12/CT6 is more than 0.80 and less than 3.4, reduces the processing sensitivity of the optical lens while ensuring the processing process requirement, and is beneficial to the correction of distortion.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 3.0 < Σ CT/CT4 < 7.0, where CT4 is the central thickness of the fourth lens on the optical axis, and Σ CT is the sum of the central thicknesses of the first to sixth lenses on the optical axis. More specifically, Σ CT and CT4 further satisfy: 3.3 < sigma CT/CT4 < 6.8. The requirement that the sigma CT/CT4 is more than 3.0 and less than 7.0 is met, and the requirement on system miniaturization is favorably met.

In an exemplary embodiment, the refractive index N3 of the third lens and the refractive index N6 of the sixth lens may both be greater than 1.60. The refractive index N3 of the third lens and the refractive index N6 of the sixth lens are both larger than 1.60, so that the reasonable distribution of the system power is facilitated, and the influence of the optical system aberration is eliminated or reduced.

In an exemplary embodiment, the abbe number V4 of the fourth lens may be greater than 45, and the abbe number V6 of the sixth lens may be less than 25.0. More specifically, V4 further may be greater than 55. The abbe number V4 of the fourth lens is larger than 45, and the abbe number V6 of the sixth lens is smaller than 25.0, so that the influence of chromatic aberration can be reasonably eliminated or reduced.

In an exemplary embodiment, the optical imaging system according to the present application further comprises a stop disposed between the first lens and the second lens. The arrangement of the diaphragm between the first lens and the second lens helps to reasonably eliminate spherical aberration and coma aberration of the optical system, thereby achieving a high-performance optical system. Optionally, the optical imaging system may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element on the imaging surface. The application provides an optical imaging system with characteristics of low chromatic aberration, miniaturization, good imaging quality and the like. The optical imaging system according to the above-described embodiment of the present application may employ a plurality of lenses, for example, six lenses as described above. By reasonably distributing the focal power and the surface shape of each lens, the central thickness of each lens, the on-axis distance between each lens and the like, incident light can be effectively converged, the optical total length of the imaging lens is reduced, the machinability of the imaging lens is improved, and the optical imaging system is more favorable for production and processing.

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

However, it will be appreciated by those skilled in the art that the number of lenses constituting the optical imaging system may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although 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, if desired.

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

Example 1

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

As shown in fig. 1, the optical imaging system, in order from an object side to an image side, comprises: 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 element E1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

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

TABLE 1

In the present example, the total effective focal length f of the optical imaging system is 2.57mm, the total length TTL of the optical imaging system (i.e., the distance on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S15 of the optical imaging system) is 5.50mm, the half ImgH of the diagonal length of the effective pixel region on the imaging surface S15 of the optical imaging system is 2.34mm, the half semifov of the maximum field angle of the optical imaging system is 60.51 °, and the aperture value Fno of the optical imaging system is 2.23.

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the sixth lens E6 are aspheric surfaces, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric surface formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c is 1/R (i.e., paraxial curvature c is as in Table 1 above)The inverse of the radius of curvature R); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the high-order coefficient A of each of the aspherical mirror surfaces S1 to S12 used in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄And A₁₆。

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

1.2010E-01

-2.8981E-01

2.3847E-01

-1.4669E-01

8.3207E-02

-3.4468E-02

6.5047E-03

S2

-1.6295E-01

5.7984E-02

-1.4304E+00

4.1826E+00

-7.8253E+00

8.1167E+00

-3.7290E+00

S3

-1.1893E-02

1.6350E-01

-1.5228E+00

6.2673E+00

-1.4689E+01

1.8084E+01

-9.1981E+00

S4

-2.5504E-01

2.2099E-01

1.0721E+00

-5.7696E+00

1.2965E+01

-1.4506E+01

6.4805E+00

S5

-3.5052E-01

1.0450E-03

2.5172E+00

-9.6681E+00

1.8651E+01

-1.9055E+01

8.0779E+00

S6

-1.7281E-01

-4.9251E-01

3.0707E+00

-7.5934E+00

1.0679E+01

-8.1324E+00

2.6080E+00

S7

3.4255E-02

-5.4162E-01

1.9291E+00

-3.7670E+00

4.4084E+00

-2.7669E+00

6.9253E-01

S8

-2.2101E-01

2.3834E-01

-4.4323E-01

6.6002E-01

-6.0181E-01

3.2797E-01

-7.5730E-02

S9

-7.3398E-03

-5.7708E-02

3.1800E-02

-1.0138E-01

1.1454E-01

-4.6785E-02

6.4654E-03

S10

-1.3901E-01

2.0651E-01

-2.5845E-01

1.6349E-01

-6.6458E-02

1.8095E-02

-2.3852E-03

S11

-3.5116E-01

-9.1539E-02

4.0496E-01

-3.7902E-01

1.7992E-01

-4.3142E-02

4.1211E-03

S12

-3.8491E-01

2.9718E-01

-1.6333E-01

5.9728E-02

-1.3534E-02

1.7015E-03

-8.9410E-05

TABLE 2

Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 1, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 2B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 1. Fig. 2C shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 1, which represents a deviation of different image heights on the imaging plane after the light passes through the lens. As can be seen from fig. 2A to 2C, the optical imaging system according to embodiment 1 can achieve good imaging quality.

Example 2

An optical imaging system according to embodiment 2 of the present application is described below with reference to fig. 3 to 4C. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 3 shows a schematic structural diagram of an optical imaging system according to embodiment 2 of the present application.

As shown in fig. 3, the optical imaging system, in order from an object side to an image side, comprises: 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 element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 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 2.08mm, the total length TTL of the optical imaging system is 5.00mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S15 of the optical imaging system is 2.34mm, the half Semi-FOV of the maximum field angle of the optical imaging system is 60.04 °, and the aperture value Fno of the optical imaging system is 2.20.

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

TABLE 3

TABLE 4

Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 2, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 4B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 2. Fig. 4C shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 2, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. As can be seen from fig. 4A to 4C, the optical imaging system according to embodiment 2 can achieve good imaging quality.

Example 3

An optical imaging system according to embodiment 3 of the present application is described below with reference to fig. 5 to 6C. Fig. 5 shows a schematic structural diagram of an optical imaging system according to embodiment 3 of the present application.

As shown in fig. 5, the optical imaging system, in order from an object side to an image side, comprises: 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 element E1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 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 2.35mm, the total length TTL of the optical imaging system is 5.51mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S15 of the optical imaging system is 2.36mm, the half Semi-FOV of the maximum field angle of the optical imaging system is 60.26 °, and the aperture value Fno of the optical imaging system is 2.23.

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

TABLE 5

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

7.6595E-02

-2.0489E-01

2.3298E-01

-1.9373E-01

1.1082E-01

-3.7226E-02

5.4056E-03

S2

-2.1586E-01

-2.0051E-02

-6.2918E-01

2.4377E+00

-5.6041E+00

6.4212E+00

-3.0921E+00

S3

-6.8517E-02

5.5615E-02

-1.0193E+00

4.3422E+00

-1.1426E+01

1.5559E+01

-8.9591E+00

S4

-1.4253E-01

2.5056E-01

-3.4586E-01

5.2730E-01

8.4154E-01

-2.8555E+00

2.4929E+00

S5

-3.4483E-01

4.8601E-01

-1.7201E+00

5.1012E+00

-8.3195E+00

7.4066E+00

-2.7807E+00

S6

-3.3667E-01

6.7612E-01

-1.9343E+00

4.1925E+00

-5.2518E+00

3.6921E+00

-1.1580E+00

S7

-3.0449E-02

1.4258E-01

-5.4556E-01

1.0224E+00

-9.9030E-01

5.4937E-01

-1.4521E-01

S8

-1.9244E-01

9.6340E-02

-3.8540E-02

3.4292E-02

-5.1744E-02

5.2178E-02

-1.4525E-02

S9

8.2992E-02

-3.9115E-01

5.8373E-01

-6.2156E-01

4.0230E-01

-1.3402E-01

1.7685E-02

S10

-2.2918E-02

-1.4702E-01

2.3096E-01

-2.3308E-01

1.3086E-01

-3.6853E-02

4.0695E-03

S11

-3.7033E-01

-6.7300E-02

3.5937E-01

-3.3634E-01

1.5442E-01

-3.4837E-02

3.0702E-03

S12

-3.5522E-01

2.7691E-01

-1.4169E-01

4.7264E-02

-9.8914E-03

1.1653E-03

-5.8184E-05

TABLE 6

Fig. 6A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 3, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 6B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 3. Fig. 6C shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 3, which represents a deviation of different image heights on the imaging plane after the light passes through the lens. As can be seen from fig. 6A to 6C, the optical imaging system according to embodiment 3 can achieve good imaging quality.

Example 4

An optical imaging system according to embodiment 4 of the present application is described below with reference to fig. 7 to 8C. Fig. 7 shows a schematic structural diagram of an optical imaging system according to embodiment 4 of the present application.

As shown in fig. 7, the optical imaging system, in order from an object side to an image side, comprises: 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 element E1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 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 2.20mm, the total length TTL of the optical imaging system is 5.80mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S15 of the optical imaging system is 2.36mm, the half Semi-FOV of the maximum field angle of the optical imaging system is 60.10 °, and the aperture value Fno of the optical imaging system is 2.24.

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

TABLE 7

TABLE 8

Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 4, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 8B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 4. Fig. 8C shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 4, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. As can be seen from fig. 8A to 8C, the optical imaging system according to embodiment 4 can achieve good imaging quality.

Example 5

An optical imaging system according to embodiment 5 of the present application is described below with reference to fig. 9 to 10C. Fig. 9 shows a schematic structural diagram of an optical imaging system according to embodiment 5 of the present application.

As shown in fig. 9, the optical imaging system, in order from an object side to an image side, comprises: 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 2.36mm, the total length TTL of the optical imaging system is 5.80mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S15 of the optical imaging system is 2.36mm, the half Semi-FOV of the maximum field angle of the optical imaging system is 60.19 °, and the aperture value Fno of the optical imaging system is 2.23.

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

TABLE 9

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

7.0778E-03

-6.6865E-02

7.0306E-02

-3.7599E-02

1.2160E-02

-2.2468E-03

1.8244E-04

S2

-2.0150E-01

6.8223E-02

-3.7789E-01

9.3528E-01

-1.3852E+00

1.0866E+00

-3.7145E-01

S3

1.5997E-02

1.1525E-01

-5.1181E-01

2.1003E+00

-4.0602E+00

4.0683E+00

-1.2750E+00

S4

-1.9586E-01

1.4427E-01

9.3572E-02

-6.5423E-01

3.7935E+00

-8.2760E+00

7.1857E+00

S5

-1.6273E-01

-2.3687E-01

2.8942E-01

2.6652E+00

-7.9137E+00

8.3653E+00

-2.4225E+00

S6

-8.5827E-02

-4.7798E-01

1.2751E+00

-9.5959E-01

-3.4697E-01

8.2488E-01

-2.9804E-01

S7

-5.5445E-02

-1.4063E-01

1.6602E-01

3.1014E-01

-5.2721E-01

3.0305E-01

-6.8550E-02

S8

-1.9352E-01

2.8879E-01

-6.5260E-01

1.0760E+00

-1.0294E+00

6.2127E-01

-1.6372E-01

S9

-5.5655E-02

1.1040E-01

-2.2154E-01

1.9091E-01

-7.4694E-02

1.2388E-02

-5.7751E-04

S10

-1.4920E-01

2.2789E-01

-2.7725E-01

1.5602E-01

-2.7959E-02

-7.6671E-03

2.7293E-03

S11

-7.1063E-01

2.8586E-01

2.2705E-01

-5.5090E-01

4.5841E-01

-1.8383E-01

2.9399E-02

S12

-3.5474E-01

3.2229E-01

-2.1543E-01

9.3926E-02

-2.5099E-02

3.7498E-03

-2.3878E-04

Watch 10

Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 5, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 10B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of example 5. Fig. 10C shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 5, which represents a deviation of different image heights on the imaging plane after the light passes through the lens. As can be seen from fig. 10A to 10C, the optical imaging system according to embodiment 5 can achieve good imaging quality.

Example 6

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

As shown in fig. 11, the optical imaging system, in order from an object side to an image side, comprises: 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 element E1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 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 2.26mm, the total length TTL of the optical imaging system is 5.33mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S15 of the optical imaging system is 2.36mm, the half Semi-FOV of the maximum field angle of the optical imaging system is 62.94 °, and the aperture value Fno of the optical imaging system is 2.23.

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

TABLE 11

TABLE 12

Fig. 12A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 6, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of example 6. Fig. 12C shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 6, which represents a deviation of different image heights on the imaging plane after the light passes through the lens. As can be seen from fig. 12A to 12C, the optical imaging system according to embodiment 6 can achieve good imaging quality.

Example 7

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

As shown in fig. 13, the optical imaging system, in order from an object side to an image side, comprises: 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 element E1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 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 2.05mm, the total length TTL of the optical imaging system is 5.22mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S15 of the optical imaging system is 2.36mm, the half Semi-FOV of the maximum field angle of the optical imaging system is 60.18 °, and the aperture value Fno of the optical imaging system is 2.24.

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

Watch 13

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

9.0364E-02

-2.5913E-01

3.0434E-01

-1.9878E-01

7.4060E-02

-1.4184E-02

9.2966E-04

S2

-1.5640E-01

-4.1951E-01

7.8526E-01

-9.7519E-01

1.0283E+00

-1.0619E+00

4.7048E-01

S3

-6.9156E-02

6.8853E-01

-7.1195E+00

3.8996E+01

-1.1425E+02

1.7244E+02

-1.0463E+02

S4

-3.2434E-01

1.1274E+00

-6.9050E+00

3.1383E+01

-7.9419E+01

1.0581E+02

-5.6813E+01

S5

-4.6262E-01

1.3320E+00

-7.2864E+00

2.4948E+01

-4.6208E+01

4.4052E+01

-1.7136E+01

S6

-2.5760E-01

1.9030E+00

-8.7028E+00

2.0957E+01

-2.7472E+01

1.8781E+01

-5.2755E+00

S7

-2.2076E-01

1.6678E+00

-6.2558E+00

1.1990E+01

-1.2632E+01

7.2339E+00

-1.8062E+00

S8

-3.9427E-01

1.1485E+00

-3.4702E+00

7.1791E+00

-8.9750E+00

6.0521E+00

-1.6508E+00

S9

-1.3534E-01

5.0789E-01

-1.0939E+00

1.3062E+00

-9.2632E-01

3.5323E-01

-5.5479E-02

S10

-2.4835E-01

4.6975E-01

-5.6954E-01

3.6405E-01

-1.1640E-01

1.5547E-02

-6.6307E-04

S11

-2.0664E-01

-9.4960E-01

1.7958E+00

-1.5950E+00

8.3655E-01

-2.4329E-01

2.9381E-02

S12

-4.1351E-01

3.0538E-01

-1.6173E-01

6.4469E-02

-1.6624E-02

2.3355E-03

-1.3463E-04

TABLE 14

Fig. 14A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 7, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 14B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 7. Fig. 14C shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 7, which represents a deviation of different image heights on the imaging plane after the light passes through the lens. As can be seen from fig. 14A to 14C, the optical imaging system according to embodiment 7 can achieve good imaging quality.

Example 8

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

As shown in fig. 15, the optical imaging system, in order from an object side to an image side, comprises: 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 element E1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 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 1.84mm, the total length TTL of the optical imaging system is 5.29mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S15 of the optical imaging system is 2.36mm, the half Semi-FOV of the maximum field angle of the optical imaging system is 60.14 °, and the aperture value Fno of the optical imaging system is 2.24.

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

Watch 15

TABLE 16

Fig. 16A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 8, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 16B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of example 8. Fig. 16C shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 8, which represents a deviation of different image heights on the imaging plane after the light passes through the lens. As can be seen from fig. 16A to 16C, the optical imaging system according to embodiment 8 can achieve good imaging quality.

Example 9

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

As shown in fig. 17, the optical imaging system, in order from an object side to an image side, comprises: 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 3.22mm, the total length TTL of the optical imaging system is 5.80mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S15 of the optical imaging system is 2.47mm, the half Semi-FOV of the maximum field angle of the optical imaging system is 60.13 °, and the aperture value Fno of the optical imaging system is 2.79.

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

TABLE 17

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

3.5219E-02

-1.5595E-01

-3.9708E-02

1.8855E-01

-1.4070E-01

4.8375E-02

-6.7980E-03

S2

-1.7525E-01

-9.6626E-02

-5.4803E-01

1.3723E+00

-1.3709E+00

7.0458E-01

-1.2697E-01

S3

-4.7833E-02

2.9044E-01

-4.3239E+00

2.2944E+01

-7.0786E+01

1.1580E+02

-7.9449E+01

S4

-4.4915E-01

4.9682E-01

3.6237E+00

-4.3174E+01

1.6305E+02

-2.7459E+02

1.7509E+02

S5

-4.4673E-01

9.5788E-01

2.8414E-01

-2.1698E+01

8.9484E+01

-1.4925E+02

9.1702E+01

S6

-3.1007E-01

5.0977E-01

1.5966E-01

-5.8958E+00

1.8001E+01

-2.2439E+01

1.0354E+01

S7

-6.2449E-02

-2.1049E-01

1.6720E+00

-6.3875E+00

1.2193E+01

-1.0765E+01

3.6016E+00

S8

1.7330E-02

-6.4444E-01

1.1991E+00

-1.6841E+00

1.7332E+00

-1.1209E+00

3.5305E-01

S9

1.4149E-01

-5.9858E-01

8.4114E-01

-8.5802E-01

4.8974E-01

-1.2758E-01

8.7541E-03

S10

-2.3126E-01

6.1699E-01

-1.0458E+00

9.9901E-01

-6.2900E-01

2.2800E-01

-3.4648E-02

S11

-4.8396E-01

5.2695E-01

-5.9953E-01

5.1838E-01

-3.4885E-01

1.4041E-01

-2.2379E-02

S12

-9.2801E-02

5.3827E-02

-2.5345E-02

7.5648E-03

-1.3006E-03

1.0868E-04

-2.6074E-06

Watch 18

Fig. 18A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 9, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 18B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of example 9. Fig. 18C shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 9, which represents a deviation of different image heights on the imaging plane after the light passes through the lens. As can be seen from fig. 18A to 18C, the optical imaging system according to embodiment 9 can achieve good imaging quality.

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

Watch 19

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.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

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

a first lens having a negative optical power;

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

a third lens having a negative optical power;

a fourth lens having an optical power;

a fifth lens having optical power; and

a sixth lens having optical power;

the total effective focal length f of the optical imaging system, the Semi-FOV which is half of the maximum field angle of the optical imaging system, and the combined focal length f234 of the second lens, the third lens, and the fourth lens satisfy the following conditional expression:

3.20mm＜f×tan(Semi-FOV)＜5.65mm；

0.5＜f234/f＜3.0。

2. the optical imaging system of claim 1, wherein a maximum field angle FOV of the optical imaging system satisfies: FOV > 120.

3. The optical imaging system of claim 1, wherein a distance TTL on the optical axis from an object side surface of the first lens to an imaging surface of the optical imaging system, a half ImgH of a diagonal length of an effective pixel area on the imaging surface of the optical imaging system, and a total effective focal length f of the optical imaging system satisfy: TTL/ImgH multiplied by f is more than 4.0mm and less than 7.6 mm.

4. The optical imaging system of claim 1, wherein the radius of curvature of the object-side surface of the third lens, R5, the radius of curvature of the image-side surface of the third lens, R6, and the total effective focal length f of the optical imaging system satisfy: 2 < | (R5+ R6) |/f < 11.2.

5. The optical imaging system of claim 1, wherein the effective focal length f4 of the fourth lens satisfies, with half the Semi-FOV of the maximum field angle of the optical imaging system: 5.10mm < | f4| × tan (Semi-FOV) < 21.00 mm.

6. The optical imaging system of claim 1, wherein a center thickness CT3 of the third lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy: 1.0 < CT4/CT3 < 5.0.

7. The optical imaging system according to claim 1, wherein a distance SAG11 on the optical axis from an intersection point of an object-side surface of the first lens and the optical axis to an effective radius vertex of the object-side surface of the first lens to a distance SAG12 on the optical axis from an intersection point of an image-side surface of the first lens and the optical axis to an effective radius vertex of the image-side surface of the first lens satisfies: 1.0 < SAG12/SAG11 < 2.5.

8. The optical imaging system of claim 1, wherein a maximum value ET of edge thicknesses of the first to sixth lenses_MAXSatisfies the following conditions: ET_MAX＜1.75mm。

9. The optical imaging system of claim 1, wherein a center thickness CT5 of the fifth lens on the optical axis is separated from a distance T56 of the fifth lens and the sixth lens on the optical axis by: 0.5 < CT5/T56 < 4.5.

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

a first lens having a negative optical power;

a third lens having a negative optical power;

a fourth lens having an optical power;

a fifth lens having optical power; and

a sixth lens having optical power;

a maximum value ET of edge thicknesses of the first lens to the sixth lens_MAXSatisfies the following conditions: ET_MAX＜1.75mm。