CN210243944U - Optical imaging system - Google Patents

Abstract

The application discloses an optical imaging system, which comprises in order from an object side to an image side along an optical axis: the first lens with negative focal power, the object side surface of the first lens is a concave surface, and the image side surface of the first lens is a concave surface; a second lens having an optical power; a third lens having a negative optical power; a fourth lens having a focal power, wherein the object-side surface of the fourth lens is a concave surface, and the image-side surface of the fourth lens is a convex surface; a fifth lens having optical power; the effective focal length f1 of the first lens and the effective focal length f2 of the second lens meet the requirement that f1/f2 is less than-1.5 and is more than-2.3.

Description

Optical imaging system

Technical Field

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

Background

In recent years, with the development of scientific technology, the market demand for imaging systems suitable for portable electronic products has been increasing. For example, a mobile phone is developed from a single shot to a multi-shot mobile phone, and a wide-angle imaging system is often carried in the multi-shot mobile phone. Moreover, the rapid development of the imaging system of the mobile phone, especially the popularization of the large-size and high-pixel CMOS chip, makes the mobile phone manufacturer have more stringent requirements for the imaging quality of the imaging system. In addition, with the improvement of the performance and the reduction of the size of the CCD and the CMOS devices, higher requirements are also placed on the high imaging quality and the miniaturization of the associated imaging system.

In order to meet the demand for miniaturization and to meet the imaging requirements, there is a need for an optical imaging system that can achieve both wide angle, large aperture, high imaging quality, and miniaturization.

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

In one embodiment, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens can satisfy-2.3 ≦ f1/f2 < -1.5.

In one embodiment, the radius of curvature of the object side surface of the first lens, R1, and the entrance pupil diameter EPD of the optical imaging system may satisfy-2.0 < R1/EPD/10 < -1.0.

In one embodiment, the radius of curvature R9 of the object-side surface of the fifth lens and the radius of curvature R10 of the image-side surface of the fifth lens satisfy 0 < R10/R9 ≦ 1.8.

In one embodiment, ImgH, which is half the diagonal length of the effective pixel area on the imaging plane of the optical imaging system, and the effective focal length f of the optical imaging system may satisfy 1.0 < ImgH/f < 2.0.

In one embodiment, an on-axis distance TTL from an object-side surface of the first lens to an imaging surface of the optical imaging system and a separation distance T12 between the first lens and the second lens on an optical axis may satisfy 2.0 < TTL/T12 < 3.0.

In one embodiment, the radius of curvature R2 of the image-side surface of the first lens, the radius of curvature R3 of the object-side surface of the second lens, and the effective focal length f of the optical imaging system may satisfy 2.5 < | R2/f | + | R3/f | < 3.5.

In one embodiment, an on-axis distance from an intersection 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, SAG11, and an on-axis distance from an intersection 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, SAG12 may satisfy 1.5 < SAG12/SAG11 < 2.5.

In one embodiment, the combined focal length f23 of the second and third lenses and the combined focal length f12 of the first and second lenses may satisfy 1.0 < f23/f12 ≦ 3.0.

In one embodiment, the edge thickness ET1 of the first lens and the central thickness CT1 of the first lens on the optical axis may satisfy 1.5 < ET1/CT1 < 2.5.

In one embodiment, a Semi-FOV of a maximum field angle of the optical imaging system, an aperture value Fno of the optical imaging system, and an effective focal length f of the optical imaging system may satisfy 2.5mm^-1＜(tan(Semi-FOV)+Fno)/f＜3.7mm^-1。

In one embodiment, a sum Σ AT of the separation distances on the optical axis of any adjacent two lenses of the first to fifth lenses and a center thickness CT2 on the optical axis of the second lens may satisfy 2.5 < Σ AT/CT2 < 3.5.

This application has adopted five lens, through the reasonable collocation of the lens of different materials and the focal power of each lens of rational distribution, face type, the central thickness of each lens and the epaxial interval between each lens etc for above-mentioned optical imaging system has at least one beneficial effect such as wide angle, big light ring and high imaging quality.

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.

Detailed Description

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

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

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

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

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

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

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

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

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

In an exemplary embodiment, the first lens has a negative power, and the object side surface thereof may be concave and the image side surface thereof may be concave; the second lens has positive focal power or negative focal power; the third lens may have a negative optical power; the fourth lens has positive focal power or negative focal power, the object side surface of the fourth lens can be a concave surface, and the image side surface of the fourth lens can be a convex surface; the fifth lens has positive power or negative power. In an exemplary embodiment, the optical imaging system may further include at least one diaphragm. The diaphragm may be disposed at an appropriate position as needed, for example, between the first lens and the second 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 first lens with negative focal power and the concave mirror surfaces on the two sides is beneficial to increasing the field angle of the optical imaging system, reducing the incidence angle of light rays at the position of the diaphragm and reducing pupil aberration, and further improving the imaging quality of the optical imaging system. The focal power of the second lens is matched with that of the third lens, so that the spherical aberration and astigmatism of the optical imaging system are reduced. The focal power of the fourth lens is matched with that of the fifth lens, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface, so that the longer back focus can be realized, and in addition, the optical imaging system has a compact structure and has the characteristic of miniaturization. The positive and negative distribution of the focal power of each component of the system and the lens surface curvature are reasonably controlled, so that the imaging quality of the optical imaging system can be effectively improved, and the optical imaging system is easy to manufacture.

In an exemplary embodiment, the second lens may have a positive optical power.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression-2.3 ≦ f1/f2 < -1.5, where f1 is the effective focal length of the first lens and f2 is the effective focal length of the second lens. More specifically, f1 and f2 can satisfy-2.29 ≦ f1/f2 < -1.54. By controlling the ratio of the effective focal length of the first lens to the effective focal length of the second lens, the first lens and the second lens can provide sufficient optical power while contributing less negative spherical aberration. And the negative spherical aberration can be corrected conveniently by the lens at the image side direction of the second lens, so that the on-axis view field of the optical imaging system has better image quality.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression-2.0 < R1/EPD/10 < -1.0, where R1 is the radius of curvature of the object-side surface of the first lens and EPD is the entrance pupil diameter of the optical imaging system. More specifically, R1 and EPD satisfy-1.63 < R1/EPD/10 < -1.11. Through the mutual relation of the curvature radius of the object side surface of the first lens and the entrance pupil diameter of the optical imaging system, the aperture of the first lens is favorably controlled, and the light flux of the optical imaging system is favorably improved.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0 < R10/R9 ≦ 1.8, 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 0.11 < R10/R9 ≦ 1.79. By controlling the surface shapes of the two mirror surfaces of the fifth lens, the thickness distribution of the fifth lens in the radial direction of the optical axis can be controlled, so that the fifth lens has good processability.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1.0 < ImgH/f < 2.0, where ImgH is a half of a diagonal length of an effective pixel area on an imaging plane of the optical imaging system, and f is an effective focal length of the optical imaging system. More specifically, ImgH and f satisfy 1.08 < ImgH/f < 1.71. Through the ratio of the half of the diagonal length of the effective pixel area on the control imaging surface to the effective focal length of the optical imaging system, the value of the effective focal length can be effectively guaranteed, so that the characteristic of a large aperture of the optical imaging system is guaranteed, and a better photographing effect can be achieved in a dark environment in the anti-shaking process.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 2.0 < TTL/T12 < 3.0, where TTL is an on-axis distance from an object-side surface of the first lens to an imaging surface of the optical imaging system, and T12 is a separation distance between the first lens and the second lens on an optical axis. More specifically, TTL and T12 satisfy 2.43 < TTL/T12 < 2.83. By controlling the ratio of the total optical length of the optical imaging system to the separation distance between the first lens and the second lens, the optical imaging system has a structure which is convenient to manufacture and assemble, and the structure of the optical imaging system is compact.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 2.5 < | R2/f | + | R3/f | < 3.5, where R2 is a radius of curvature of an image-side surface of the first lens, R3 is a radius of curvature of an object-side surface of the second lens, and f is an effective focal length of the optical imaging system. More specifically, R2, R3, and f can satisfy 2.92 < | R2/f | + | R3/f | < 3.31. By controlling the curvature radius of the image side surface of the first lens, the curvature radius of the object side surface of the second lens and the effective focal length of the optical imaging system to satisfy the relationship, the contribution of the first lens and the second lens to the fifth-order spherical aberration and the third-order astigmatism of the optical imaging system is favorably reduced, so that the astigmatism amount and the fifth-order spherical aberration generated by the two lenses are well balanced with the astigmatism amount and the fifth-order spherical aberration generated by the lens in the image side direction of the second lens, and the optical imaging system has good imaging quality.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1.5 < SAG12/SAG11 < 2.5, where SAG11 is an on-axis distance from an intersection 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, and SAG12 is an on-axis distance from an intersection 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. More specifically, SAG11 and SAG12 may satisfy 1.87 < SAG12/SAG11 < 2.46. The thickness of the first lens can be controlled by controlling the rise of each of the two mirror surfaces of the first lens, so that the first lens is easy to process.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1.0 < f23/f12 ≦ 3.0, where f23 is a combined focal length of the second lens and the third lens, and f12 is a combined focal length of the first lens and the second lens. More specifically, f23 and f12 can satisfy 1.02 < f23/f12 ≦ 2.94. By controlling the ratio of the combined focal length of the second lens and the third lens to the combined focal length of the first lens and the second lens, the spherical aberration contributed by the first lens, the second lens and the third lens to the optical imaging system can be reduced, and the on-axis field of view of the optical imaging system has good imaging quality.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1.5 < ET1/CT1 < 2.5, where ET1 is an edge thickness of the first lens and CT1 is a center thickness of the first lens on an optical axis. More specifically, ET1 and CT1 satisfy 1.54 < ET1/CT1 < 2.28. The shape of the first lens can be effectively controlled by controlling the edge thickness and the center thickness of the first lens, and the thickness of the first lens is uniformly distributed, so that the first lens is easy to machine and form.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression of 2.5mm^-1＜(tan(Semi-FOV)+Fno)/f＜3.7mm^-1Wherein, Semi-FOV is half of the maximum field angle of the optical imaging system, Fno is the aperture value of the optical imaging system, and f is the effective focal length of the optical imaging system. More specifically, Semi-FOV, Fno and f may satisfy 2.51mm^-1＜(tan(Semi-FOV)+Fno)/f＜3.69mm^-1. By controlling the maximum half field angle, aperture value and effective focal length of the optical imaging system, the optical imaging system has the characteristics of large aperture and wide angle. The optical imaging lens has a large aperture while ensuring wide-angle characteristics, and can improve the shutter speed. When the optical imaging system provided by the application is used for shooting the image, the background blurring effect of the image is good. In addition, the optical imaging system provided by the application can obtain an image with good effect when used in a dark environment.

In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 2.5 < Σ AT/CT2 < 3.5, where Σ AT is a sum of separation distances of any adjacent two lenses of the first to fifth lenses on the optical axis, and CT2 is a center thickness of the second lens on the optical axis. Illustratively, Σ AT — T12+ T23+ T34+ T45, where T12 is the separation distance between the first lens and the second lens on the optical axis, T23 is the separation distance between the second lens and the third lens on the optical axis, T34 is the separation distance between the third lens and the fourth lens on the optical axis, and T45 is the separation distance between the fourth lens and the fifth lens on the optical axis. More specifically, Σ AT and CT2 may satisfy 2.56 < Σ AT/CT2 < 3.31. By controlling the ratio of the sum of the distance between any two adjacent lenses with the focal power in the first lens and the lens closest to the imaging surface on the optical axis to the central thickness of the second lens, the shape of the first lens and the shape of the second lens can be effectively controlled and balanced, and the optical imaging system has good processability. In addition, the distortion generated by the first lens and the second lens can be controlled, so that the optical imaging lens has good distortion performance.

The optical imaging system according to the above-described embodiment of the present application may employ a plurality of lenses, for example, five lenses as described above. By reasonably distributing the focal power, the surface type, the central thickness of each lens, the on-axis distance between each lens and the like, the volume of the imaging system can be effectively reduced, the sensitivity of the imaging system can be reduced, and the processability of the imaging system can be improved, so that the optical imaging system is more favorable for production and processing and can be suitable for portable electronic products. Simultaneously, the optical imaging system of this application still possesses good optical properties such as big wide angle, big light ring, high imaging quality.

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

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

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

Example 1

An optical imaging system according to embodiment 1 of the present application is described below with reference to fig. 1 to 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 first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a filter E6.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S1. 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 concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. Filter E6 has an object side S11 and an image side S12. The optical imaging system has an imaging plane S13, and light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging plane S13.

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

TABLE 1

In embodiment 1, the value of the total effective focal length f of the optical imaging system is 1.04mm, the aperture value Fno of the optical imaging system is 1.64, the value of the on-axis distance TTL from the object side surface of the first lens to the imaging plane is 5.30mm, the value of the half ImgH of the diagonal length of the effective pixel area on the imaging plane is 1.20mm, and the value of the half Semi-FOV of the maximum field angle is 48.3 °.

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 to the fifth lens E5 are aspheric surfaces, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric surface formula:

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

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

4.0421E-01

-5.3487E-01

5.6864E-01

-4.5398E-01

2.5519E-01

-9.6790E-02

2.3484E-02

-3.2866E-03

2.0209E-04

S2

4.9502E-01

-1.6881E-01

-1.7129E+00

6.5104E+00

-1.2490E+01

1.4258E+01

-9.7174E+00

3.6416E+00

-5.7652E-01

S3

-2.0755E-01

6.7456E-01

-1.4420E+01

1.1077E+02

-5.3061E+02

1.5034E+03

-2.4898E+03

2.2188E+03

-9.4728E+02

S4

-5.1784E-01

7.4900E+00

-6.5536E+01

3.6144E+02

-1.3309E+03

3.2042E+03

-4.8501E+03

4.2036E+03

-1.6028E+03

S5

-9.1982E-01

6.0372E+00

-5.7699E+01

3.4569E+02

-1.3941E+03

3.7952E+03

-6.7535E+03

7.1649E+03

-3.4233E+03

S6

-9.3880E-01

7.3097E-01

1.2229E+00

-3.0065E+01

1.6522E+02

-4.8561E+02

8.2255E+02

-7.5259E+02

2.9090E+02

S7

3.9919E-01

-1.7216E+00

9.4765E+00

-4.9432E+01

1.7112E+02

-3.9354E+02

5.8147E+02

-4.7071E+02

1.5158E+02

S8

2.6630E-01

1.8658E+00

-1.8753E+01

1.1449E+02

-4.3177E+02

1.0181E+03

-1.4650E+03

1.1825E+03

-4.0753E+02

S9

-1.4516E+00

3.8522E+00

-3.2348E+01

2.0325E+02

-7.7357E+02

1.8078E+03

-2.5512E+03

2.0007E+03

-6.6996E+02

S10

-1.5627E+00

2.3041E+00

-2.0350E+00

9.7281E-01

-3.0285E+00

1.0331E+01

-1.5000E+01

1.0143E+01

-2.6636E+00

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 first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a filter E6.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S1. 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 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 concave image-side surface S10. Filter E6 has an object side S11 and an image side S12. The optical imaging system has an imaging plane S13, and light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging plane S13.

In embodiment 2, the value of the total effective focal length f of the optical imaging system is 0.90mm, the aperture value Fno of the optical imaging system is 1.55, the value of the on-axis distance TTL from the object side surface of the first lens to the imaging plane is 5.30mm, the value of the half ImgH of the diagonal length of the effective pixel area on the imaging plane is 1.20mm, and the value of the half Semi-FOV of the maximum field angle is 48.3 °.

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 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 first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a filter E6.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S1. 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 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 concave image-side surface S10. Filter E6 has an object side S11 and an image side S12. The optical imaging system has an imaging plane S13, and light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging plane S13.

In embodiment 3, the value of the total effective focal length f of the optical imaging system is 0.71mm, the aperture value Fno of the optical imaging system is 1.50, the value of the on-axis distance TTL from the object side surface of the first lens to the imaging plane is 5.37mm, the value of the half ImgH of the diagonal length of the effective pixel area on the imaging plane is 1.20mm, and the value of the half Semi-FOV of the maximum field angle is 48.3 °.

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

5.0202E-01

-6.7500E-01

6.4641E-01

-4.4500E-01

2.1278E-01

-6.8371E-02

1.4104E-02

-1.6957E-03

9.1000E-05

S2

5.5363E-01

1.3838E+00

-1.3351E+01

4.4174E+01

-8.4811E+01

1.0067E+02

-7.2682E+01

2.9283E+01

-5.0544E+00

S3

-2.7064E-01

2.9322E-01

-5.5114E+00

-8.6786E+01

2.1636E+03

-1.9968E+04

9.3955E+04

-2.2503E+05

2.1654E+05

S4

4.2381E-01

-8.0693E+00

1.2904E+02

-1.2007E+03

6.9589E+03

-2.6178E+04

6.1798E+04

-8.2614E+04

4.7430E+04

S5

-1.2703E+00

-3.6476E+00

7.3485E+01

-3.8593E+02

-1.8428E+02

1.1630E+04

-5.9027E+04

1.3190E+05

-1.1384E+05

S6

-8.6476E-01

-6.6819E+00

7.7275E+01

-4.4906E+02

1.6060E+03

-3.5369E+03

4.4886E+03

-2.7926E+03

5.0455E+02

S7

1.5077E+00

-1.0600E+01

5.6287E+01

-2.0835E+02

4.5942E+02

-3.0490E+02

-8.9836E+02

2.0365E+03

-1.2571E+03

S8

1.1994E+00

-1.8294E+01

1.3400E+02

-5.5861E+02

1.4644E+03

-2.4734E+03

2.6192E+03

-1.5355E+03

3.4197E+02

S9

7.4443E-01

-1.6817E+01

5.8998E+01

3.5100E+01

-1.1142E+03

4.5858E+03

-9.5950E+03

1.0657E+04

-5.0110E+03

S10

1.5354E+00

-1.4804E+01

5.8758E+01

-1.4200E+02

2.2053E+02

-2.1809E+02

1.3103E+02

-4.3010E+01

5.8250E+00

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 first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a filter E6.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S1. 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 concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. Filter E6 has an object side S11 and an image side S12. The optical imaging system has an imaging plane S13, and light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging plane S13.

In embodiment 4, the value of the total effective focal length f of the optical imaging system is 0.94mm, the aperture value Fno of the optical imaging system is 1.64, the value of the on-axis distance TTL of the object side surface of the first lens to the imaging plane is 5.30mm, the value of the half ImgH of the diagonal length of the effective pixel area on the imaging plane is 1.20mm, and the value of the half Semi-FOV of the maximum field angle is 48.3 °.

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

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

4.3552E-01

-5.9043E-01

5.9369E-01

-4.3638E-01

2.2569E-01

-7.8938E-02

1.7693E-02

-2.2909E-03

1.3045E-04

S2

5.0811E-01

-5.5977E-02

-2.4948E+00

7.9717E+00

-1.3543E+01

1.3937E+01

-8.6340E+00

2.9568E+00

-4.3006E-01

S3

-2.6156E-01

9.7733E-01

-2.2308E+01

1.9731E+02

-1.0351E+03

2.8867E+03

-3.2149E+03

-1.9958E+03

5.3406E+03

S4

3.2183E-01

-4.7288E+00

5.9231E+01

-4.7714E+02

2.3878E+03

-7.6124E+03

1.5029E+04

-1.6715E+04

7.9858E+03

S5

-8.0150E-01

-2.9694E+00

4.9864E+01

-3.9716E+02

1.9231E+03

-5.8155E+03

1.0550E+04

-1.0211E+04

3.9316E+03

S6

-6.9443E-01

-2.8844E+00

2.8101E+01

-1.4177E+02

4.0700E+02

-5.5302E+02

2.3635E+02

-1.8939E+02

5.0586E+02

S7

9.6374E-01

-4.8783E+00

1.2703E+01

3.1364E+01

-4.8888E+02

2.2223E+03

-4.9607E+03

5.3552E+03

-2.1790E+03

S8

1.1652E+00

-1.4644E+01

1.3150E+02

-7.5721E+02

2.9557E+03

-7.7413E+03

1.2980E+04

-1.2509E+04

5.2258E+03

S9

-3.3553E-01

-1.1970E+01

7.7612E+01

-2.9028E+02

6.6600E+02

-8.1057E+02

8.3503E+01

1.0010E+03

-8.7578E+02

S10

-8.0195E-01

-3.9238E+00

2.7459E+01

-8.8319E+01

1.7578E+02

-2.2470E+02

1.7904E+02

-8.0797E+01

1.5744E+01

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 first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a filter E6.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S1. 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 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. Filter E6 has an object side S11 and an image side S12. The optical imaging system has an imaging plane S13, and light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging plane S13.

In embodiment 5, the value of the total effective focal length f of the optical imaging system is 0.92mm, the aperture value Fno of the optical imaging system is 1.65, the value of the on-axis distance TTL of the object side surface of the first lens to the imaging plane is 5.30mm, the value of the half ImgH of the diagonal length of the effective pixel area on the imaging plane is 1.20mm, and the value of the half Semi-FOV of the maximum field angle is 48.3 °.

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

4.7996E-01

-6.6242E-01

6.6465E-01

-4.8293E-01

2.4419E-01

-8.2657E-02

1.7797E-02

-2.2041E-03

1.1991E-04

S2

5.4110E-01

3.6591E-02

-3.2776E+00

1.0079E+01

-1.6665E+01

1.6619E+01

-9.9153E+00

3.2533E+00

-4.5130E-01

S3

-2.8602E-01

1.4920E+00

-3.1692E+01

2.8329E+02

-1.4593E+03

3.7017E+03

-1.7912E+03

-1.0915E+04

1.6352E+04

S4

-1.4415E+00

1.7532E+01

-1.5041E+02

9.1931E+02

-3.9242E+03

1.1120E+04

-1.9698E+04

1.9616E+04

-8.3512E+03

S5

-2.0668E+00

1.4694E+01

-1.3935E+02

9.7654E+02

-4.6083E+03

1.3894E+04

-2.5134E+04

2.4436E+04

-9.5595E+03

S6

-6.1192E-01

-4.5295E+00

5.8241E+01

-4.6611E+02

2.4949E+03

-8.5774E+03

1.7802E+04

-2.0107E+04

9.4383E+03

S7

1.4265E+00

-7.8606E+00

6.5697E+01

-4.5382E+02

2.1455E+03

-6.4310E+03

1.1515E+04

-1.1128E+04

4.4224E+03

S8

-7.5996E+00

8.7445E+01

-7.2017E+02

4.1808E+03

-1.6529E+04

4.3303E+04

-7.1533E+04

6.7209E+04

-2.7332E+04

S9

-7.6663E+00

7.1756E+01

-6.1155E+02

3.6071E+03

-1.4233E+04

3.6908E+04

-6.0381E+04

5.6546E+04

-2.3184E+04

S10

-1.9035E-01

-9.7342E+00

5.7603E+01

-1.8780E+02

3.9003E+02

-5.2287E+02

4.3687E+02

-2.0672E+02

4.2297E+01

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 first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a filter E6.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S1. 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 convex image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. Filter E6 has an object side S11 and an image side S12. The optical imaging system has an imaging plane S13, and light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging plane S13.

In embodiment 6, the value of the total effective focal length f of the optical imaging system is 1.10mm, the aperture value Fno of the optical imaging system is 1.65, the value of the on-axis distance TTL of the object side surface of the first lens to the imaging plane is 5.30mm, the value of the half ImgH of the diagonal length of the effective pixel area on the imaging plane is 1.20mm, and the value of the half Semi-FOV of the maximum field angle is 48.3 °.

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

4.2531E-01

-7.0132E-01

8.8828E-01

-7.9272E-01

4.8500E-01

-1.9827E-01

5.1619E-02

-7.7324E-03

5.0779E-04

S2

4.8065E-01

-1.9591E-01

-2.4213E+00

9.6614E+00

-1.8447E+01

2.0579E+01

-1.3592E+01

4.9094E+00

-7.4662E-01

S3

-2.6681E-01

1.2997E+00

-2.2512E+01

1.7009E+02

-7.7581E+02

2.0155E+03

-2.6957E+03

1.1728E+03

4.0383E+02

S4

-2.7279E-01

-2.2910E+00

3.4594E+01

-2.1328E+02

7.7335E+02

-1.7744E+03

2.5341E+03

-2.0567E+03

7.2264E+02

S5

-3.0889E-01

-6.1653E+00

4.5268E+01

-2.2366E+02

8.2401E+02

-2.1831E+03

3.8600E+03

-3.9619E+03

1.7500E+03

S6

6.7999E-01

-1.1407E+01

7.6381E+01

-4.1852E+02

1.6799E+03

-4.5187E+03

7.6026E+03

-7.1272E+03

2.8107E+03

S7

1.1047E+00

-5.3430E+00

3.8262E+01

-2.4767E+02

1.0784E+03

-2.9751E+03

5.0221E+03

-4.7002E+03

1.8588E+03

S8

-3.5265E+00

3.2390E+01

-2.0451E+02

9.6975E+02

-3.2810E+03

7.6112E+03

-1.1430E+04

9.9175E+03

-3.7304E+03

S9

-4.9088E+00

2.2791E+01

-1.1906E+02

5.9358E+02

-2.3144E+03

6.1514E+03

-1.0296E+04

9.6079E+03

-3.7392E+03

S10

-2.3725E+00

5.1219E+00

2.3651E+00

-5.0621E+01

1.5740E+02

-2.6042E+02

2.5051E+02

-1.3200E+02

2.9516E+01

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 first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a filter E6.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S1. The second lens element E2 has positive 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 convex object-side surface S5 and a concave 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 negative power, and has a convex object-side surface S9 and a concave image-side surface S10. Filter E6 has an object side S11 and an image side S12. The optical imaging system has an imaging plane S13, and light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging plane S13.

In embodiment 7, the value of the total effective focal length f of the optical imaging system is 1.03mm, the aperture value Fno of the optical imaging system is 1.65, the value of the on-axis distance TTL of the object side surface of the first lens to the imaging plane is 5.35mm, the value of the half ImgH of the diagonal length of the effective pixel area on the imaging plane is 1.20mm, and the value of the half Semi-FOV of the maximum angle of view is 48.3 °.

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 first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a filter E6.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S1. The second lens element E2 has positive 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 convex object-side surface S5 and a concave 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 concave image-side surface S10. Filter E6 has an object side S11 and an image side S12. The optical imaging system has an imaging plane S13, and light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging plane S13.

In embodiment 8, the value of the total effective focal length f of the optical imaging system is 0.91mm, the aperture value Fno of the optical imaging system is 1.66, the value of the on-axis distance TTL of the object side surface of the first lens to the imaging plane is 5.35mm, the value of the half ImgH of the diagonal length of the effective pixel area on the imaging plane is 1.20mm, and the value of the half Semi-FOV of the maximum field angle is 48.3 °.

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

4.7848E-01

-6.5727E-01

6.6001E-01

-4.8683E-01

2.5081E-01

-8.6569E-02

1.9034E-02

-2.4120E-03

1.3447E-04

S2

5.8088E-01

-8.2638E-02

-3.0914E+00

9.8474E+00

-1.6605E+01

1.6899E+01

-1.0320E+01

3.4809E+00

-4.9853E-01

S3

-2.6137E-01

1.6902E+00

-4.3000E+01

5.0706E+02

-3.8274E+03

1.8195E+04

-5.3421E+04

8.8343E+04

-6.3563E+04

S4

-4.6687E+00

5.5547E+01

-4.9959E+02

3.2194E+03

-1.4067E+04

3.8946E+04

-6.2706E+04

4.8566E+04

-9.1467E+03

S5

-1.8260E+00

2.7258E+00

5.9200E+01

-1.0297E+03

7.9806E+03

-3.5729E+04

9.1395E+04

-1.2281E+05

6.6833E+04

S6

-1.1963E+00

-2.8916E+00

6.3816E+01

-5.7382E+02

3.0905E+03

-1.0366E+04

2.0953E+04

-2.3304E+04

1.0852E+04

S7

8.1247E-01

-2.7421E+00

5.8537E+00

1.1411E+02

-1.4291E+03

7.6383E+03

-2.1570E+04

3.1467E+04

-1.8794E+04

S8

-2.6776E+00

2.3031E+01

-1.7948E+02

1.1640E+03

-5.2910E+03

1.5840E+04

-2.9878E+04

3.2603E+04

-1.5803E+04

S9

-2.8174E+00

1.5532E+01

-1.8257E+02

1.3707E+03

-6.1102E+03

1.6531E+04

-2.6617E+04

2.3407E+04

-8.6391E+03

S10

6.4182E-01

-1.4933E+01

7.6638E+01

-2.3370E+02

4.6307E+02

-5.9881E+02

4.8906E+02

-2.3030E+02

4.7951E+01

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.

In summary, examples 1 to 8 each satisfy the relationship shown in table 17.

TABLE 17

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 (22)

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

the first lens with negative focal power, the object side surface of the first lens is a concave surface, and the image side surface of the first lens is a concave surface;

a second lens having an optical power;

a third lens having a negative optical power;

a fourth lens having a focal power, wherein the object-side surface of the fourth lens is a concave surface, and the image-side surface of the fourth lens is a convex surface;

a fifth lens having optical power;

the effective focal length f1 of the first lens and the effective focal length f2 of the second lens meet the condition that f1/f2 is less than-1.5 and is more than-2.3.

2. The optical imaging system of claim 1, wherein a radius of curvature R1 of the object side surface of the first lens and an entrance pupil diameter EPD of the optical imaging system satisfy-2.0 < R1/EPD/10 < -1.0.

3. 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 < R10/R9 ≦ 1.8.

4. The optical imaging system according to claim 1, wherein ImgH, which is half the diagonal length of an effective pixel area on an imaging plane of the optical imaging system, and an effective focal length f of the optical imaging system satisfy 1.0 < ImgH/f < 2.0.

5. The optical imaging system of claim 1, wherein an on-axis distance TTL from an object-side surface of the first lens to an imaging surface of the optical imaging system and a separation distance T12 between the first lens and the second lens on the optical axis satisfy 2.0 < TTL/T12 < 3.0.

6. The optical imaging system of claim 1, wherein the radius of curvature of the image-side surface of the first lens, R2, the radius of curvature of the object-side surface of the second lens, R3, and the effective focal length f of the optical imaging system satisfy 2.5 < | R2/f | + | R3/f | < 3.5.

7. The optical imaging system according to claim 1, wherein an on-axis distance from an intersection 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, SAG11, and an on-axis distance from an intersection 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, SAG12 satisfy 1.5 < SAG12/SAG11 < 2.5.

8. The optical imaging system of claim 1, wherein a combined focal length f23 of the second and third lenses and a combined focal length f12 of the first and second lenses satisfy 1.0 < f23/f12 ≦ 3.0.

9. The optical imaging system of claim 1, wherein the edge thickness ET1 of the first lens and the central thickness CT1 of the first lens on the optical axis satisfy 1.5 < ET1/CT1 < 2.5.

10. The optical imaging system of claim 1, wherein the Semi-FOV of the maximum field angle of the optical imaging system, the aperture value Fno of the optical imaging system, and the effective focal length f of the optical imaging system satisfy 2.5mm^-1＜(tan(Semi-FOV)+Fno)/f＜3.7mm^-1。

11. The optical imaging system of any one of claims 1 to 10, wherein a sum Σ AT of separation distances on the optical axis of any two adjacent lenses of the first to fifth lenses and a center thickness CT2 on the optical axis of the second lens satisfy 2.5 < Σ AT/CT2 < 3.5.

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

the first lens with negative focal power, the object side surface of the first lens is a concave surface, and the image side surface of the first lens is a concave surface;

a second lens having an optical power;

a third lens having a negative optical power;

a fourth lens having a focal power, wherein the object-side surface of the fourth lens is a concave surface, and the image-side surface of the fourth lens is a convex surface;

a fifth lens having optical power;

half of the Semi-FOV of the maximum field angle of the optical imaging system, the aperture value Fno of the optical imaging system and the effective focal length f of the optical imaging system satisfy 2.5mm^-1＜(tan(Semi-FOV)+Fno)/f＜3.7mm^-1。

13. The optical imaging system of claim 12, wherein a radius of curvature R1 of the object side surface of the first lens and an entrance pupil diameter EPD of the optical imaging system satisfy-2.0 < R1/EPD/10 < -1.0.

14. The optical imaging system of claim 13, wherein the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy-2.3 ≦ f1/f2 < -1.5.

15. The optical imaging system of claim 12, wherein 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 satisfy 0 < R10/R9 ≦ 1.8.

16. The optical imaging system according to claim 12, wherein ImgH, which is half the diagonal length of an effective pixel area on an imaging plane of the optical imaging system, and an effective focal length f of the optical imaging system satisfy 1.0 < ImgH/f < 2.0.

17. The optical imaging system of claim 12, wherein an on-axis distance TTL from an object-side surface of the first lens to an imaging surface of the optical imaging system and a separation distance T12 between the first lens and the second lens on the optical axis satisfy 2.0 < TTL/T12 < 3.0.

18. The optical imaging system of claim 12, wherein the radius of curvature of the image-side surface of the first lens, R2, the radius of curvature of the object-side surface of the second lens, R3, and the effective focal length f of the optical imaging system satisfy 2.5 < | R2/f | + | R3/f | < 3.5.

19. The optical imaging system of claim 12, wherein an on-axis distance from an intersection of the 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, SAG11, and an on-axis distance from an intersection of the 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, SAG12 satisfies 1.5 < SAG12/SAG11 < 2.5.

20. The optical imaging system of claim 12, wherein a combined focal length f23 of the second and third lenses and a combined focal length f12 of the first and second lenses satisfy 1.0 < f23/f12 ≦ 3.0.

21. The optical imaging system of claim 12, wherein the edge thickness ET1 of the first lens and the central thickness CT1 of the first lens on the optical axis satisfy 1.5 < ET1/CT1 < 2.5.

22. The optical imaging system of any one of claims 12 to 21, wherein a sum Σ AT of separation distances on the optical axis of any two adjacent lenses of the first to fifth lenses and a center thickness CT2 of the second lens on the optical axis satisfy 2.5 < Σ AT/CT2 < 3.5.

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