CN211086742U - Optical imaging system - Google Patents

Abstract

The application discloses an optical imaging system which sequentially comprises a first lens with positive focal power, a second lens with negative focal power, a third lens, a fourth lens, a fifth lens with positive focal power, a sixth lens with negative focal power, a concave object-side surface and a concave image-side surface, wherein the object-side surface of the third lens is a concave surface, the image-side surface of the fourth lens is a convex surface, the object-side surface of the sixth lens is a concave surface, the effective focal length f of the optical imaging system and the maximum half-field angle Semi-FOV of the optical imaging system meet f × tan (Semi-FOV) > 4.4mm, the on-axis distance L from the object-side surface of the first lens to the imaging surface of the optical imaging system, the effective focal length f of the optical imaging system, half gH of the diagonal length of an effective pixel area on the imaging surface TT, and the entrance pupil diameter EPD of the optical imaging system meet TT L× f/(ImgH × EPD) < 2.7 from the object side to the image side.

Description

Optical imaging system

Technical Field

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

Background

In recent years, with the development of scientific technology, the market demand for optical imaging systems suitable for portable electronic products has been increasing. The rapid development of the mobile phone camera module, especially the popularization of large-size and high-pixel CMOS chips, makes mobile phone manufacturers have more stringent requirements for the imaging quality of the optical imaging system. In addition, as the thickness size of portable electronic devices such as mobile phones is reduced, higher demands are also made on miniaturization of the associated imaging systems.

In order to meet the miniaturization requirement and meet the imaging requirement, an optical imaging system which can achieve both miniaturization and large image plane and high resolution is required.

SUMMERY OF THE UTILITY MODEL

The present application provides an optical imaging system applicable to portable electronic products that may address, at least in part, at least one of the above-identified deficiencies in the prior art.

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 positive optical power; a second lens having a negative optical power; the third lens with focal power, the object side surface of the third lens can be a concave surface, and the image side surface of the third lens can be a convex surface; a fourth lens having an optical power; a fifth lens having positive optical power, the object side surface of which may be convex; the object side surface of the sixth lens with negative focal power can be a concave surface, and the image side surface of the sixth lens can be a concave surface.

In one embodiment, the effective focal length f of the optical imaging system and the maximum half field angle Semi-FOV of the optical imaging system may satisfy f × tan (Semi-FOV) > 4.4 mm.

In one embodiment, an on-axis distance TT L from an object-side surface of the first lens to an imaging plane of the optical imaging system, an effective focal length f of the optical system, a half ImgH of a diagonal length of an effective pixel area on the imaging plane, and an entrance pupil diameter EPD of the optical imaging system may satisfy TT L× f/(ImgH × EPD) < 2.7.

In one embodiment, an on-axis distance from SAG21 from an intersection of an object-side surface of the second lens and the optical axis to a vertex of an effective radius of the object-side surface of the second lens to the optical axis, and a separation distance T12 from the first lens and the second lens on the optical axis may satisfy-0.6 < SAG21/T12 < 3.6.

In one embodiment, a separation distance T56 between the fifth lens and the sixth lens on the optical axis and an on-axis distance TT L from the object side surface of the first lens to the imaging surface of the optical imaging system may satisfy 1.5 < T56/TT L× 10 < 1.7.

In one embodiment, a separation distance T56 between the fifth lens and the sixth lens on the optical axis and a center thickness CT6 of the sixth lens on the optical axis may satisfy 1.8 < T56/CT6 < 2.2.

In one embodiment, the effective focal length f5 of the fifth lens and the effective focal length f of the optical imaging system can satisfy 1 < f5/f < 1.3.

In one embodiment, the effective focal length f6 of the sixth lens and the radius of curvature R11 of the object side surface of the sixth lens may satisfy 0.4 < f6/R11 < 0.8.

In one embodiment, the effective focal length f5 of the fifth lens may satisfy 5.6mm < f5 < 6.1 mm.

In one embodiment, the effective focal length f of the optical imaging system, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens may satisfy 0.2 < f/(f1-f2) < 0.5.

In one embodiment, the radius of curvature R12 of the image-side surface of the sixth lens and the effective focal length f of the optical imaging system may satisfy 0.3 < R12/f < 0.8.

In one embodiment, a radius of curvature R9 of the object-side surface of the fifth lens and a radius of curvature R10 of the image-side surface of the fifth lens may satisfy 0.3 < (R9+ R10)/(R9-R10) < 0.9.

In one embodiment, the object-side surface of the first lens element can be convex and the image-side surface can be concave.

In one embodiment, the image side surface of the second lens may be concave.

In one embodiment, the image side surface of the fifth lens element can be convex.

The optical imaging system has the advantages that the six lenses are adopted, and through reasonable collocation of the lenses made of different materials and reasonable distribution of focal power, surface type, center thickness of each lens, on-axis distance between the lenses and the like, the optical imaging system has at least one beneficial effect of large image surface, miniaturization, high resolution and the like.

Drawings

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

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

fig. 2A to 2D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration 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 4D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion 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 6D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion 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 8D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion 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 10D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion 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 12D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion 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 14D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion 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 16D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion 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;

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

Detailed Description

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

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

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

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

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

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

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

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

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

In an exemplary embodiment, the first lens may have a positive optical power; the second lens may have a negative optical power; the third lens has positive focal power or negative focal power, the object side surface of the third lens can be a concave surface, and the image side surface of the third lens can be a convex surface; the fourth lens has positive focal power or negative focal power; the fifth lens can have positive focal power, and the object side surface of the fifth lens can be a convex surface; the sixth lens element can have a negative optical power, and can have a concave object-side surface and a concave image-side surface. By reasonably controlling the positive and negative distribution of focal power of each component of the system and the surface curvature of the lens, the spherical aberration and chromatic aberration of the optical imaging system can be effectively corrected, the focal powers of each lens are balanced, and the sensitivity of the lens is reduced; in addition, each lens has good machinability, and the optical imaging system is convenient to assemble.

In an exemplary embodiment, the object-side surface of the first lens may be convex and the image-side surface may be concave; the image side surface of the second lens can be a concave surface; the image-side surface of the fifth lens element can be convex. By controlling the surface shapes of the respective mirror surfaces of the first lens, the second lens, and the fifth lens, the sensitivity of these mirror surfaces can be reduced. In addition, the imaging light can be effectively converged, and deflection of the imaging light can be relieved.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression f × tan (Semi-FOV) > 4.4mm, where f is an effective focal length of the optical imaging system and the Semi-FOV is a maximum half field angle of the optical imaging system, more specifically, f and Semi-FOV may satisfy 4.42mm < f × tan (Semi-FOV) < 4.7 mm.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression TT L× f/(ImgH × EPD) < 2.7, where TT L is an on-axis distance from an object side surface of the first lens to an imaging surface of the optical imaging system, f is an effective focal length of the optical imaging system, ImgH is a half of a diagonal length of an effective pixel region on the imaging surface, and EPD is an entrance pupil diameter of the optical imaging system, more specifically TT L, f, ImgH, and EPD may satisfy 2.35 < TT L× f/(ImgH × EPD) < 2.65.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression-0.6 < SAG21/T12 < 3.6, where SAG21 is an on-axis distance of an intersection of an object-side surface of the second lens and the optical axis to an effective radius apex of the object-side surface of the second lens, and T12 is a separation distance of the first lens and the second lens on the optical axis. More specifically, SAG21 and T12 may satisfy-0.55 < SAG21/T12 < 3.55. By controlling the rise of the object side surface of the second lens and the distance between the first lens and the second lens on the optical axis, the deflection of imaging light rays at the object side surface of the second lens can be effectively reduced, the sensitivity of the second lens is reduced, in addition, the spherical aberration and astigmatism generated by the first lens can be relieved, and the optical imaging system has good imaging performance.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1.5 < T56/TT L× 10 < 1.7, where T56 is a distance between the fifth lens and the sixth lens on the optical axis, and TT L is an on-axis distance between the object-side surface of the first lens and the imaging surface of the optical imaging system, more specifically, T56 and TT L may satisfy 1.51 < T56/TT L× 10 < 1.69.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1.8 < T56/CT6 < 2.2, where T56 is a separation distance of the fifth lens and the sixth lens on the optical axis, and CT6 is a center thickness of the sixth lens on the optical axis. More specifically, T56 and CT6 satisfy 1.87 < T56/CT6 < 2.14. By controlling the ratio of the spacing distance of the fifth lens and the sixth lens on the optical axis to the center thickness of the sixth lens, the chief ray angle at the imaging surface can be reduced, so that the optical imaging system can be better matched with an imaging chip. In addition, the sixth lens can be made to have good manufacturability.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1 < f5/f < 1.3, where f5 is an effective focal length of the fifth lens, and f is an effective focal length of the optical imaging system. More specifically, f5 and f can satisfy 1.03 < f5/f < 1.21. The ratio of the effective focal length of the fifth lens to the effective focal length of the optical imaging system is controlled, so that astigmatism and field curvature generated by the lens in the object-side direction of the fifth lens can be effectively reduced, the deflection angle of imaging light can be reduced, the intensity of total reflection ghost images is reduced or the total reflection ghost images are eliminated, and the optical imaging system has good imaging performance.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.4 < f6/R11 < 0.8, where f6 is an effective focal length of the sixth lens and R11 is a radius of curvature of an object-side surface of the sixth lens. More specifically, f6 and R11 may satisfy 0.63 < f6/R11 < 0.77. By controlling the ratio of the effective focal length of the sixth lens element to the curvature radius of the object-side surface of the sixth lens element, the deflection angle of the imaging light on the object-side surface can be reduced, and astigmatism, distortion and field curvature generated by the lens element in the object-side direction of the sixth lens element can be reduced, so that the optical imaging system has good imaging performance.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 5.6mm < f5 < 6.1mm, where f5 is an effective focal length of the fifth lens. More specifically, f5 may satisfy 5.7mm < f5 < 6.0 mm. The effective focal length of the fifth lens is controlled, so that the focal powers of the lenses are relatively balanced, the incident angle and the emergent angle of imaging light rays at the fifth lens can be reduced, and the sensitivity of the fifth lens is further reduced.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.2 < f/(f1-f2) < 0.5, where f is an effective focal length of the optical imaging system, f1 is an effective focal length of the first lens, and f2 is an effective focal length of the second lens. More specifically, f1 and f2 may satisfy 0.30 < f/(f1-f2) < 0.45. By controlling the effective focal length of the first lens, the effective focal length of the second lens and the effective focal length of the optical imaging system, imaging light can be effectively converged, spherical aberration, astigmatism, field curvature, chromatic aberration and the like generated by the two lenses are balanced respectively, and the imaging quality of the optical imaging system is improved.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.3 < R12/f < 0.8, where R12 is a radius of curvature of an image-side surface of the sixth lens, and f is an effective focal length of the optical imaging system. More specifically, R12 and f can satisfy 0.55 < R12/f < 0.65. The specific value of the curvature radius of the image side surface of the sixth lens and the effective focal length of the optical imaging system is controlled, so that the included angle between the imaging light and the imaging surface can be reduced, the illumination of the imaging surface can be increased, and the optical imaging system and the imaging chip can be well matched.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.3 < (R9+ R10)/(R9-R10) < 0.9, where R9 is a radius of curvature of an object-side surface of the fifth lens and R10 is a radius of curvature of an image-side surface of the fifth lens. More specifically, R9 and R10 may satisfy 0.31 < (R9+ R10)/(R9-R10) < 0.89. By controlling the respective curvature radii of the two mirror surfaces of the fifth lens, the incidence angle and the emergence angle of the imaging light rays at the fifth lens can be reduced, the sensitivity of the two mirror surfaces is further reduced, and in addition, high-level coma aberration generated by the two mirror surfaces can be balanced.

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

The optical imaging system according to the above-described embodiment of the present application may employ a plurality of lenses, for example, six lenses as described above. By reasonably distributing the focal power, the surface type, the central thickness of each lens, the on-axis distance between each lens and the like, the volume of the imaging system can be effectively reduced, the sensitivity of the imaging system can be reduced, and the processability of the imaging system can be improved, so that the optical imaging system is more favorable for production and processing and can be suitable for portable electronic products. Meanwhile, the optical imaging system further has excellent optical performances such as large image plane, miniaturization and high resolution.

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 2D. Fig. 1 shows a schematic configuration diagram of an optical imaging system according to embodiment 1 of the present application.

As shown in fig. 1, the optical imaging system, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a filter E7.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex 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 concave object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The optical imaging system has an imaging plane 15, and light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging plane 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 embodiment 1, the value of the effective focal length f of the optical imaging system is 5.41mm, the value of the on-axis distance TT L from the object side surface S1 of the first lens E1 to the imaging surface S15 is 6.22mm, and the value of ImgH, which is half the diagonal length of the effective pixel area on the imaging surface S15, is 4.74 mm.

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 being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the high-order term coefficients A that can be used for the aspherical mirror surfaces S1 to S12 in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀。

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 system. 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 distortion curve of the optical imaging system of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 2D shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 1, which represents the deviation of different image heights on the imaging plane after the light passes through the system. As can be seen from fig. 2A to 2D, 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 4D. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 3 shows a schematic structural diagram of an optical imaging system according to embodiment 2 of the present application.

As shown in fig. 3, the optical imaging system, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a filter E7.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex 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 concave object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The optical imaging system has an imaging plane 15, and light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging plane S15.

In embodiment 2, the value of the effective focal length f of the optical imaging system is 5.41mm, the value of the on-axis distance TT L from the object side surface S1 of the first lens E1 to the imaging surface S15 is 6.23mm, and the value of ImgH, which is half the diagonal length of the effective pixel area on the imaging surface S15, is 4.70 mm.

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

TABLE 3

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

3.5453E-02

-1.3000E-04

-6.4900E-03

2.0796E-02

-3.1590E-02

2.8333E-02

-1.5080E-02

4.4080E-03

-5.5000E-04

S2

-2.7190E-02

3.2948E-02

9.0790E-03

-9.6360E-02

1.7533E-01

-1.7182E-01

9.5489E-02

-2.7840E-02

3.2570E-03

S3

-3.2300E-02

5.0263E-02

-2.8930E-02

-1.4130E-02

5.4051E-02

-5.9170E-02

3.3332E-02

-9.1500E-03

9.0700E-04

S4

-5.2700E-03

2.4306E-02

-1.1220E-02

-3.9280E-02

1.3303E-01

-1.9547E-01

1.5980E-01

-6.9530E-02

1.2730E-02

S5

-6.7730E-02

-2.3440E-02

9.8604E-02

-3.0153E-01

5.2428E-01

-5.6696E-01

3.7423E-01

-1.3788E-01

2.1881E-02

S6

-1.0884E-01

7.6607E-02

-1.1317E-01

1.2859E-01

-1.2505E-01

8.5590E-02

-3.6190E-02

8.4270E-03

-8.3000E-04

S7

-1.5001E-01

1.4095E-01

-1.4136E-01

1.4907E-01

-1.5155E-01

1.0763E-01

-4.7230E-02

1.1626E-02

-1.2300E-03

S8

-1.3385E-01

1.0997E-01

-9.3620E-02

8.3689E-02

-6.6970E-02

3.7231E-02

-1.2860E-02

2.5010E-03

-2.1000E-04

S9

-3.8270E-02

-1.0660E-02

1.9023E-02

-1.7190E-02

9.6110E-03

-3.4200E-03

7.2300E-04

-8.0000E-05

3.5300E-06

S10

-1.1500E-02

-1.1490E-02

1.1349E-02

-6.9300E-03

2.8010E-03

-6.7000E-04

8.9600E-05

-6.3000E-06

1.7600E-07

S11

-1.1694E-01

6.9688E-02

-2.7890E-02

7.6980E-03

-1.3700E-03

1.5500E-04

-1.1000E-05

4.2500E-07

-7.2000E-09

S12

-5.5260E-02

2.4946E-02

-7.7700E-03

1.6390E-03

-2.4000E-04

2.2900E-05

-1.4000E-06

5.0900E-08

-8.0000E-10

TABLE 4

Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 2, which represents the convergent focus deviation of light rays of different wavelengths after passing through the system. 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 distortion curve of the optical imaging system of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 4D 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 system. As can be seen from fig. 4A to 4D, 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 6D. Fig. 5 shows a schematic structural diagram of an optical imaging system according to embodiment 3 of the present application.

As shown in fig. 5, the optical imaging system, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a filter E7.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex 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 concave object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The optical imaging system has an imaging plane 15, and light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging plane S15.

In embodiment 3, the value of the effective focal length f of the optical imaging system is 5.41mm, the value of the on-axis distance TT L from the object side surface S1 of the first lens E1 to the imaging surface S15 is 6.22mm, and the value of ImgH, which is half the diagonal length of the effective pixel area on the imaging surface S15, is 4.63 mm.

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

TABLE 5

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

3.7171E-02

-6.5000E-04

-1.5600E-03

4.3970E-03

-5.1300E-03

3.8160E-03

-1.8100E-03

4.9300E-04

-6.1000E-05

S2

-2.4790E-02

2.0538E-02

-6.4000E-03

-1.0440E-02

2.1049E-02

-1.8940E-02

9.4770E-03

-2.5100E-03

2.6900E-04

S3

-3.4300E-02

3.5806E-02

-1.2550E-02

-7.7400E-03

2.2409E-02

-2.2850E-02

1.3028E-02

-3.9500E-03

4.9000E-04

S4

-3.2400E-03

2.9771E-02

-1.9860E-02

9.8120E-03

3.1678E-02

-8.0740E-02

8.6270E-02

-4.4950E-02

9.5290E-03

S5

-4.9060E-02

-5.0730E-02

2.4192E-01

-7.2372E-01

1.2969E+00

-1.4451E+00

9.7720E-01

-3.6722E-01

5.9066E-02

S6

-8.3880E-02

2.6311E-02

-2.1410E-02

2.2662E-02

-3.9310E-02

4.0326E-02

-2.3450E-02

7.5510E-03

-1.0300E-03

S7

-1.1989E-01

4.8388E-02

-2.4580E-02

3.8011E-02

-5.7060E-02

4.5412E-02

-2.1420E-02

6.0190E-03

-7.7000E-04

S8

-9.8390E-02

2.9387E-02

-2.1000E-03

1.8520E-03

-6.3000E-03

4.6320E-03

-1.7200E-03

3.7700E-04

-3.8000E-05

S9

-2.0090E-02

-2.5410E-02

1.9538E-02

-1.4540E-02

8.9340E-03

-3.6100E-03

8.5500E-04

-1.1000E-04

5.3200E-06

S10

4.7210E-03

-2.0330E-02

7.9750E-03

-2.4800E-03

9.6000E-04

-2.6000E-04

3.6600E-05

-2.6000E-06

6.6700E-08

S11

-7.3150E-02

1.9571E-02

-6.5000E-04

-4.5000E-04

9.1300E-05

-8.6000E-06

4.4500E-07

-1.2000E-08

1.4300E-10

S12

-3.9530E-02

9.3580E-03

-1.3900E-03

1.4100E-04

-1.3000E-05

1.1500E-06

-7.9000E-08

3.2000E-09

-5.4000E-11

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 system. 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 distortion curve of the optical imaging system of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 6D shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 3, which represents the deviation of different image heights on the imaging plane after the light passes through the system. As can be seen from fig. 6A to 6D, 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 8D. Fig. 7 shows a schematic structural diagram of an optical imaging system according to embodiment 4 of the present application.

As shown in fig. 7, the optical imaging system, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a filter E7.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a convex 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 concave object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The optical imaging system has an imaging plane 15, and light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging plane S15.

In embodiment 4, the value of the effective focal length f of the optical imaging system is 5.39mm, the value of the on-axis distance TT L from the object side surface S1 of the first lens E1 to the imaging surface S15 is 6.25mm, and the value of ImgH, which is half the diagonal length of the effective pixel area on the imaging surface S15, is 4.58 mm.

Table 7 shows a basic parameter table of the optical imaging system of example 4 in which the units of the radius of curvature, the thickness, and the 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 system. 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 distortion curve of the optical imaging system of embodiment 4, which represents distortion magnitude values corresponding to different image heights. Fig. 8D 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 system. As can be seen from fig. 8A to 8D, 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 10D. Fig. 9 shows a schematic structural diagram of an optical imaging system according to embodiment 5 of the present application.

As shown in fig. 9, the optical imaging system, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a filter E7.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave 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 convex image-side surface S10. The sixth lens element E6 has negative power, and has a concave object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The optical imaging system has an imaging plane 15, and light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging plane S15.

In embodiment 5, the value of the effective focal length f of the optical imaging system is 5.38mm, the value of the on-axis distance TT L from the object side surface S1 of the first lens E1 to the imaging surface S15 is 6.25mm, and the value of ImgH, which is half the diagonal length of the effective pixel area on the imaging surface S15, is 4.55 mm.

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

TABLE 9

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

3.6681E-02

5.9300E-04

-3.6700E-03

7.2500E-03

-7.3500E-03

4.8080E-03

-2.0300E-03

5.0400E-04

-5.9000E-05

S2

-4.7150E-02

6.4183E-02

-5.5070E-02

2.7683E-02

1.4380E-03

-1.3540E-02

9.3020E-03

-2.7900E-03

3.1700E-04

S3

-4.3920E-02

6.0817E-02

-4.4350E-02

1.3858E-02

1.7006E-02

-2.5930E-02

1.5887E-02

-4.7700E-03

5.7200E-04

S4

6.2100E-03

1.6447E-02

-5.5000E-03

-2.8090E-02

1.1017E-01

-1.8106E-01

1.6253E-01

-7.6810E-02

1.5189E-02

S5

-4.2520E-02

-4.2200E-02

1.6000E-01

-4.8055E-01

8.7286E-01

-9.9231E-01

6.8634E-01

-2.6432E-01

4.3711E-02

S6

-8.6210E-02

3.3396E-02

-2.8920E-02

1.2038E-02

3.6500E-03

-2.0910E-02

2.1199E-02

-8.9600E-03

1.4430E-03

S7

-1.3032E-01

7.0386E-02

-4.7670E-02

5.6543E-02

-6.5420E-02

4.0926E-02

-1.3770E-02

2.6600E-03

-2.7000E-04

S8

-1.0209E-01

4.3970E-02

-1.8620E-02

1.7965E-02

-1.9020E-02

1.1227E-02

-3.7100E-03

6.9300E-04

-5.8000E-05

S9

-2.4570E-02

-2.0540E-02

1.7926E-02

-1.3180E-02

7.7600E-03

-3.0900E-03

7.3000E-04

-9.1000E-05

4.5100E-06

S10

-3.1000E-04

-1.8330E-02

8.7840E-03

-3.1000E-03

1.1320E-03

-2.9000E-04

4.1900E-05

-3.1000E-06

9.2400E-08

S11

-8.1510E-02

2.4938E-02

-2.4300E-03

-3.1000E-05

2.2600E-05

-1.1000E-06

-4.9000E-08

6.0200E-09

-1.5000E-10

S12

-4.3880E-02

1.2668E-02

-2.6900E-03

4.5800E-04

-6.2000E-05

6.0700E-06

-3.8000E-07

1.3500E-08

-2.0000E-10

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 system. 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 distortion curve of the optical imaging system of embodiment 5, which represents distortion magnitude values corresponding to different image heights. Fig. 10D shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 5, which represents the deviation of different image heights on the imaging plane after the light passes through the system. As can be seen from fig. 10A to 10D, 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 12D. Fig. 11 shows a schematic configuration diagram of an optical imaging system according to embodiment 6 of the present application.

As shown in fig. 11, the optical imaging system, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a filter E7.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive 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 concave object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The optical imaging system has an imaging plane 15, and light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging plane S15.

In embodiment 6, the value of the effective focal length f of the optical imaging system is 5.37mm, the value of the on-axis distance TT L from the object side surface S1 of the first lens E1 to the imaging surface S15 is 6.26mm, and the value of ImgH, which is half the diagonal length of the effective pixel area on the imaging surface S15, is 4.57 mm.

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

TABLE 11

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

3.6186E-02

1.1340E-03

-5.2100E-03

9.3380E-03

-8.9000E-03

5.3480E-03

-2.0300E-03

4.5000E-04

-4.8000E-05

S2

-4.0120E-02

5.4867E-02

-4.2440E-02

8.4420E-03

2.4822E-02

-3.2540E-02

1.8913E-02

-5.5000E-03

6.4000E-04

S3

-4.0800E-02

5.7078E-02

-4.0080E-02

7.1140E-03

2.5595E-02

-3.3190E-02

1.9736E-02

-5.9100E-03

7.1500E-04

S4

4.6780E-03

2.1839E-02

-1.9900E-02

5.7290E-03

5.1019E-02

-1.1304E-01

1.1403E-01

-5.7390E-02

1.1849E-02

S5

-4.6780E-02

-2.0080E-02

8.9096E-02

-3.0910E-01

5.9567E-01

-7.0354E-01

5.0003E-01

-1.9640E-01

3.3042E-02

S6

-1.0944E-01

6.9001E-02

-5.3920E-02

1.5875E-02

1.4987E-02

-3.4310E-02

2.8760E-02

-1.1100E-02

1.6700E-03

S7

-1.3777E-01

6.8645E-02

-2.0330E-02

9.6780E-03

-2.2620E-02

1.7110E-02

-5.7100E-03

1.1400E-03

-1.5000E-04

S8

-9.0840E-02

2.0487E-02

1.7180E-02

-2.0520E-02

8.5160E-03

-2.0800E-03

4.8800E-04

-8.1000E-05

4.2800E-06

S9

-1.6070E-02

-2.4010E-02

1.9272E-02

-1.4850E-02

9.3390E-03

-3.9000E-03

9.5400E-04

-1.2000E-04

6.2400E-06

S10

1.0480E-03

-1.6300E-02

6.7710E-03

-2.1700E-03

8.5800E-04

-2.4000E-04

3.5100E-05

-2.6000E-06

7.6300E-08

S11

-6.5640E-02

1.4735E-02

6.5100E-04

-6.2000E-04

1.0000E-04

-8.1000E-06

3.5300E-07

-7.6000E-09

5.3300E-11

S12

-3.9810E-02

1.0354E-02

-2.0200E-03

3.1900E-04

-4.1000E-05

3.8600E-06

-2.4000E-07

8.2600E-09

-1.2000E-10

TABLE 12

Fig. 12A shows an on-axis chromatic aberration curve of the optical imaging system of example 6, which represents the convergent focus deviation of light rays of different wavelengths after passing through the system. 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 distortion curve of the optical imaging system of embodiment 6, which represents distortion magnitude values corresponding to different image heights. Fig. 12D shows a chromatic aberration of magnification curve of the optical imaging system of example 6, which represents the deviation of different image heights on the imaging plane after the light passes through the system. As can be seen from fig. 12A to 12D, 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 14D. Fig. 13 shows a schematic configuration diagram of an optical imaging system according to embodiment 7 of the present application.

As shown in fig. 13, the optical imaging system, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a filter E7.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave 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 convex image-side surface S10. The sixth lens element E6 has negative power, and has a concave object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The optical imaging system has an imaging plane 15, and light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging plane S15.

In embodiment 7, the value of the effective focal length f of the optical imaging system is 5.41mm, the value of the on-axis distance TT L from the object side surface S1 of the first lens E1 to the imaging surface S15 is 6.27mm, and the value of ImgH, which is half the diagonal length of the effective pixel area on the imaging surface S15, is 4.65 mm.

Table 13 shows a basic parameter table of the optical imaging system of example 7 in which the units of the radius of curvature, the thickness, and the 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

TABLE 14

Fig. 14A shows an on-axis chromatic aberration curve of the optical imaging system of example 7, which represents the convergent focus deviation of light rays of different wavelengths after passing through the system. 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 distortion curve of the optical imaging system of embodiment 7, which represents distortion magnitude values corresponding to different image heights. Fig. 14D shows a chromatic aberration of magnification curve of the optical imaging system of example 7, which represents the deviation of different image heights on the imaging plane after the light passes through the system. As can be seen from fig. 14A to 14D, 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 16D. Fig. 15 shows a schematic structural view of an optical imaging system according to embodiment 8 of the present application.

As shown in fig. 15, the optical imaging system, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a filter E7.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a convex 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 concave object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The optical imaging system has an imaging plane 15, and light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging plane S15.

In embodiment 8, the value of the effective focal length f of the optical imaging system is 5.39mm, the value of the on-axis distance TT L from the object side surface S1 of the first lens E1 to the imaging surface S15 is 6.28mm, and the value of ImgH, which is half the diagonal length of the effective pixel area on the imaging surface S15, is 4.66 mm.

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

Watch 15

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

3.6633E-02

1.2040E-03

-6.4700E-03

1.2300E-02

-1.3030E-02

8.7680E-03

-3.7000E-03

9.0000E-04

-9.9000E-05

S2

-2.0980E-02

1.5635E-02

-8.6000E-04

-1.7910E-02

3.0732E-02

-2.7890E-02

1.4578E-02

-4.1100E-03

4.7900E-04

S3

-3.1540E-02

3.0769E-02

-5.4900E-03

-1.7950E-02

3.5867E-02

-3.5500E-02

2.0531E-02

-6.4400E-03

8.4600E-04

S4

-2.6400E-03

2.2353E-02

4.9630E-03

-5.1620E-02

1.2952E-01

-1.7817E-01

1.4443E-01

-6.3820E-02

1.2042E-02

S5

-4.8400E-02

-3.2950E-02

1.3640E-01

-4.1889E-01

7.6698E-01

-8.7180E-01

6.0037E-01

-2.2945E-01

3.7545E-02

S6

-9.4190E-02

3.0979E-02

-2.3020E-02

2.1199E-02

-2.1950E-02

8.2560E-03

2.2410E-03

-2.2200E-03

4.2200E-04

S7

-1.2802E-01

5.1495E-02

-2.5440E-02

4.6269E-02

-6.5770E-02

4.4992E-02

-1.6790E-02

3.6560E-03

-3.9000E-04

S8

-9.4420E-02

2.6362E-02

-1.3200E-03

6.4340E-03

-1.3200E-02

9.1310E-03

-3.2600E-03

6.4100E-04

-5.5000E-05

S9

-2.0630E-02

-2.2990E-02

1.6498E-02

-1.1550E-02

7.0690E-03

-2.9100E-03

7.0500E-04

-8.9000E-05

4.5100E-06

S10

4.2250E-03

-1.8290E-02

6.4550E-03

-1.6900E-03

6.7800E-04

-2.0000E-04

3.0000E-05

-2.2000E-06

6.4000E-08

S11

-6.4550E-02

1.3646E-02

1.1830E-03

-8.1000E-04

1.3800E-04

-1.2000E-05

6.5100E-07

-1.8000E-08

2.2000E-10

S12

-3.8410E-02

8.9590E-03

-1.3700E-03

1.4600E-04

-1.3000E-05

9.4100E-07

-5.5000E-08

2.0700E-09

-3.5000E-11

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 system. 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 distortion curve of the optical imaging system of embodiment 8, which represents distortion magnitude values corresponding to different image heights. Fig. 16D shows a chromatic aberration of magnification curve of the optical imaging system of example 8, which represents the deviation of different image heights on the imaging plane after the light passes through the system. As can be seen from fig. 16A to 16D, 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 18D. Fig. 17 shows a schematic configuration diagram of an optical imaging system according to embodiment 9 of the present application.

As shown in fig. 17, the optical imaging system, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a filter E7.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a concave 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 convex image-side surface S10. The sixth lens element E6 has negative power, and has a concave object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The optical imaging system has an imaging plane 15, and light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging plane S15.

In embodiment 9, the value of the effective focal length f of the optical imaging system is 5.37mm, the value of the on-axis distance TT L from the object side surface S1 of the first lens E1 to the imaging surface S |. 5 is 6.28mm, and the value of ImgH, which is half the diagonal length of the effective pixel area on the imaging surface S15, is 4.58 mm.

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

TABLE 17

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

3.6125E-02

3.2580E-03

-1.2390E-02

2.2547E-02

-2.4100E-02

1.6305E-02

-6.8300E-03

1.6180E-03

-1.7000E-04

S2

-3.1420E-02

2.8927E-02

-9.6400E-03

-1.3740E-02

2.9426E-02

-2.7990E-02

1.5044E-02

-4.3500E-03

5.1800E-04

S3

-3.7480E-02

3.9332E-02

-1.1040E-02

-1.9330E-02

4.3941E-02

-4.5660E-02

2.7334E-02

-8.8500E-03

1.1960E-03

S4

1.3710E-03

1.3346E-02

3.6353E-02

-1.3809E-01

2.7746E-01

-3.3742E-01

2.4986E-01

-1.0327E-01

1.8456E-02

S5

-4.4050E-02

-4.6390E-02

1.9454E-01

-6.0508E-01

1.1347E+00

-1.3213E+00

9.2930E-01

-3.6156E-01

5.9969E-02

S6

-8.9020E-02

9.1710E-03

5.6244E-02

-1.4567E-01

2.0132E-01

-1.8655E-01

1.0791E-01

-3.4230E-02

4.5440E-03

S7

-1.2677E-01

4.2090E-02

1.4141E-02

-3.0950E-02

3.1016E-02

-3.6930E-02

2.6724E-02

-9.0900E-03

1.1580E-03

S8

-9.1700E-02

2.6423E-02

-1.6800E-03

8.8670E-03

-1.7050E-02

1.1435E-02

-3.8400E-03

6.9000E-04

-5.4000E-05

S9

-2.3330E-02

-1.8080E-02

1.2256E-02

-8.4500E-03

5.5330E-03

-2.4600E-03

6.3200E-04

-8.3000E-05

4.3200E-06

S10

9.9300E-04

-1.6510E-02

6.5310E-03

-1.9300E-03

7.7000E-04

-2.2000E-04

3.4600E-05

-2.7000E-06

8.5200E-08

S11

-6.3940E-02

1.1903E-02

2.2660E-03

-1.0900E-03

1.7900E-04

-1.6000E-05

8.7000E-07

-2.6000E-08

3.2400E-10

S12

-4.0740E-02

1.0061E-02

-1.7300E-03

2.2700E-04

-2.5000E-05

2.2400E-06

-1.4000E-07

4.7400E-09

-7.1000E-11

Watch 18

Fig. 18A shows an on-axis chromatic aberration curve of the optical imaging system of example 9, which represents the convergent focus deviation of light rays of different wavelengths after passing through the system. 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 distortion curve of the optical imaging system of embodiment 9, which represents distortion magnitude values corresponding to different image heights. Fig. 18D shows a chromatic aberration of magnification curve of the optical imaging system of example 9, which represents the deviation of different image heights on the imaging plane after the light passes through the system. As can be seen from fig. 18A to 18D, 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 provided with an electron photosensitive element to image, which may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging system described above.

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

Claims (24)

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

a first lens having a positive optical power;

a second lens having a negative optical power;

a third lens with focal power, wherein the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface;

a fourth lens having an optical power;

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

a sixth lens element with negative refractive power having a concave object-side surface and a concave image-side surface;

the effective focal length f of the optical imaging system and the maximum half field angle Semi-FOV of the optical imaging system meet f × tan (Semi-FOV) > 4.4 mm;

an on-axis distance TT L from an object side surface of the first lens to an imaging surface of the optical imaging system, an effective focal length f of the optical imaging system, a half of a diagonal length ImgH of an effective pixel area on the imaging surface, and an entrance pupil diameter EPD of the optical imaging system satisfy TT L× f/(ImgH × EPD) < 2.7.

2. The optical imaging system according to claim 1, wherein an on-axis distance SAG21 from an intersection point of an object-side surface of the second lens and the optical axis to an effective radius apex of the object-side surface of the second lens and a distance T12 on the optical axis between the first lens and the second lens satisfy-0.6 < SAG21/T12 < 3.6.

3. The optical imaging system of claim 1, wherein a separation distance T56 between the fifth lens and the sixth lens on the optical axis and an on-axis distance TT L between an object side surface of the first lens and an imaging surface of the optical imaging system satisfy 1.5 < T56/TT L× 10 < 1.7.

4. The optical imaging system according to claim 1, wherein a separation distance T56 between the fifth lens and the sixth lens on the optical axis and a center thickness CT6 of the sixth lens on the optical axis satisfy 1.8 < T56/CT6 < 2.2.

5. The optical imaging system of claim 1, wherein an effective focal length f5 of the fifth lens and an effective focal length f of the optical imaging system satisfy 1 < f5/f < 1.3.

6. The optical imaging system of claim 1, wherein an effective focal length f6 of the sixth lens and a radius of curvature R11 of an object side of the sixth lens satisfy 0.4 < f6/R11 < 0.8.

7. The optical imaging system of claim 1, wherein the effective focal length f5 of the fifth lens satisfies 5.6mm < f5 < 6.1 mm.

8. The optical imaging system of claim 1, wherein an effective focal length f of the optical imaging system, an effective focal length f1 of the first lens, and an effective focal length f2 of the second lens satisfy 0.2 < f/(f1-f2) < 0.5.

9. The optical imaging system of claim 1, wherein a radius of curvature R12 of an image-side surface of the sixth lens and an effective focal length f of the optical imaging system satisfy 0.3 < R12/f < 0.8.

10. The optical imaging system of claim 1, wherein a radius of curvature R9 of an object-side surface of the fifth lens and a radius of curvature R10 of an image-side surface of the fifth lens satisfy 0.3 < (R9+ R10)/(R9-R10) < 0.9.

11. The optical imaging system of any of claims 1 to 10, wherein the first lens has a convex object-side surface and a concave image-side surface; the image side surface of the second lens is a concave surface; the image side surface of the fifth lens is a convex surface.

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

a first lens having a positive optical power;

a second lens having a negative optical power;

a third lens with focal power, wherein the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface;

a fourth lens having an optical power;

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

a sixth lens element with negative refractive power having a concave object-side surface and a concave image-side surface;

the effective focal length f of the optical imaging system and the maximum half field angle Semi-FOV of the optical imaging system meet f × tan (Semi-FOV) > 4.4 mm;

the distance T56 between the fifth lens and the sixth lens on the optical axis and the distance TT L between the object side surface of the first lens and the imaging surface of the optical imaging system satisfy 1.5 < T56/TT L× 10 < 1.7.

13. The optical imaging system of claim 12, wherein an on-axis distance SAG21 from an intersection point of the object-side surface of the second lens and the optical axis to an effective radius vertex of the object-side surface of the second lens and a distance T12 on the optical axis between the first lens and the second lens satisfy-0.6 < SAG21/T12 < 3.6.

14. The optical imaging system of claim 13, wherein an on-axis distance TT L from an object-side surface of the first lens to an imaging plane of the optical imaging system, an effective focal length f of the optical imaging system, a half ImgH of a diagonal length of an effective pixel area on the imaging plane, and an entrance pupil diameter EPD of the optical imaging system satisfy TT L× f/(ImgH × EPD) < 2.7.

15. The optical imaging system of claim 12, wherein a separation distance T56 between the fifth lens and the sixth lens on the optical axis and a center thickness CT6 of the sixth lens on the optical axis satisfy 1.8 < T56/CT6 < 2.2.

16. The optical imaging system of claim 12, wherein the effective focal length f5 of the fifth lens and the effective focal length f of the optical imaging system satisfy 1 < f5/f < 1.3.

17. The optical imaging system of claim 12, wherein an effective focal length f6 of the sixth lens and a radius of curvature R11 of an object side of the sixth lens satisfy 0.4 < f6/R11 < 0.8.

18. The optical imaging system of claim 12, wherein the effective focal length f5 of the fifth lens satisfies 5.6mm < f5 < 6.1 mm.

19. The optical imaging system of claim 12, wherein the effective focal length f of the optical imaging system, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens satisfy 0.2 < f/(f1-f2) < 0.5.

20. The optical imaging system of claim 12, wherein a radius of curvature R12 of an image-side surface of the sixth lens and an effective focal length f of the optical imaging system satisfy 0.3 < R12/f < 0.8.

21. The optical imaging system of claim 12, wherein a radius of curvature R9 of an object-side surface of the fifth lens and a radius of curvature R10 of an image-side surface of the fifth lens satisfy 0.3 < (R9+ R10)/(R9-R10) < 0.9.

22. The optical imaging system of any of claims 12 to 21, wherein the first lens has a convex object-side surface and a concave image-side surface.

23. The optical imaging system of claim 22, wherein the image side surface of the second lens is concave.

24. The optical imaging system of claim 23, wherein the image side surface of the fifth lens is convex.

Images