CN211826690U

CN211826690U - Image pickup optical lens

Info

Publication number: CN211826690U
Application number: CN202020308295.XU
Authority: CN
Inventors: 张伊; 张凯元; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2020-03-12
Filing date: 2020-03-12
Publication date: 2020-10-30
Anticipated expiration: 2030-03-12

Abstract

The application discloses an optical lens for image pickup, which comprises in order from an object side to an image side: the optical turning element is provided with focal power and comprises an incident surface, a reflecting surface and an emergent surface, wherein the incident surface and the emergent surface are aspheric mirror surfaces, the reflecting surface is a plane mirror surface, and the optical turning element is configured to enable light which passes through the incident surface and enters the optical turning element along the direction of a Y optical axis to be reflected by the reflecting surface and then to be emitted along the direction of an X optical axis through the emergent surface, and the direction of the Y optical axis and the direction of the X optical axis are crossed with each other; and a second lens having a focal power, wherein the total effective focal length f of the image pickup optical lens can satisfy that f is not less than 20mm and not more than 30 mm.

Description

Image pickup optical lens

Technical Field

The present invention relates to an image pickup optical lens, and more particularly, to an image pickup optical lens including two lenses.

Background

With the rapid development of the smart phone industry, the mobile phone lens is developing towards high resolution, large view field, light weight and multiple functionality. The optical system of the mobile phone lens is required to have multiple characteristics of large caliber, long focal length, wide view field, compact structure, high image quality, low distortion and the like. In response to these high requirements, the systems of the mobile phone lenses are more and more complex, and from 4 and 5 lenses in the first mobile phone system to 7 and 8 lenses in the present, especially the telephoto lens, the number of lenses is usually increased to achieve both the telephoto characteristic and the high imaging quality.

However, the addition of the system lens, whether it be early optimization or late manufacturing, is complicated and difficult. How to use fewer lenses to manufacture a telephoto lens with high imaging quality is one of the mainstream directions of research in the field at present.

SUMMERY OF THE UTILITY MODEL

The present application provides an image pickup optical lens applicable to a portable electronic product, which can solve at least or partially at least one of the above-described drawbacks of the related art, for example, a lens that realizes a telephoto characteristic by using a combination of a piece of prism and a piece of lens.

The present application provides an imaging optical lens, in order from an object side to an image side, comprising: the optical turning element is provided with focal power and comprises an incident surface, a reflecting surface and an emergent surface, wherein the incident surface and the emergent surface are aspheric mirror surfaces, the reflecting surface is a plane mirror surface, and the optical turning element is configured to enable light which passes through the incident surface and enters the optical turning element along the direction of a Y optical axis to be reflected by the reflecting surface and then to be emitted along the direction of an X optical axis through the emergent surface, and the direction of the Y optical axis and the direction of the X optical axis are crossed with each other; and a second lens having optical power.

In one embodiment, the total effective focal length f of the image pickup optical lens may satisfy 20mm ≦ f ≦ 30 mm.

In one embodiment, the Y optical axis is substantially perpendicular to the X optical axis.

In one embodiment, the image pickup optical lens further includes a diaphragm disposed between the object side and the optical turning element, and a distance EPP on the X-axis from an incident surface of the diaphragm to the optical turning element may satisfy 0mm < EPP < 0.1 mm.

In one embodiment, the total effective focal length f of the image-pickup optical lens and a distance BFL on the X-optical axis from the image-side surface of the second lens to the imaging surface of the image-pickup optical lens may satisfy 1 < f/BFL < 1.5.

In one embodiment, the total effective focal length f of the image pickup optical lens and the effective focal length f1 of the optical turning element may satisfy 1.5 < f/f1 < 2.0.

In one embodiment, the total effective focal length f of the image pickup optical lens and the effective focal length f2 of the second lens may satisfy-1.0 < f/f2 < -0.5.

In one embodiment, the entrance pupil diameter EPD of the imaging optical lens and the half of the diagonal length ImgH of the effective pixel region on the imaging surface of the imaging optical lens satisfy 2.0 < EPD/ImgH ≦ 3.0.

In one embodiment, the abbe number V1 of the optical turning element and the abbe number V2 of the second lens may satisfy 50 < (V1+ V2)/2 < 55.

In one embodiment, the refractive index N1 of the optical turning element and the refractive index N2 of the second lens can satisfy 0.15 ≦ N2-N1 < 0.3.

In one embodiment, the total effective focal length f of the image-taking optical lens and the center thickness CT2 of the second lens on the X-ray axis may satisfy 10 ≦ f/CT2 ≦ 17.

This application has adopted two lenses (i.e. a slice of prism and a slice of lens), through 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 lens of making a video recording has at least one beneficial effect such as long focal length, miniaturization, 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 image pickup optical lens according to embodiment 1 of the present application;

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

fig. 3 shows a schematic configuration diagram of an image pickup optical lens 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 imaging optical lens of embodiment 2;

fig. 5 shows a schematic configuration diagram of an image pickup optical lens according to embodiment 3 of the present application;

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

fig. 7 shows a schematic configuration diagram of an image pickup optical lens 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 an imaging optical lens of embodiment 4;

fig. 9 shows a schematic configuration diagram of an image pickup optical lens according to embodiment 5 of the present application; and

fig. 10A to 10D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the imaging optical lens of example 5.

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 second lens discussed below may also be referred to as the third lens or the fourth 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 X-ray 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 side is called the object side surface of the lens, and the surface of each lens closest to the image side 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 imaging optical lens according to an exemplary embodiment of the present application may include, in order from an object side to an image side, an optical turning element having optical power and a second lens having optical power. In the present application, the optical turning element and the second lens may have an air space therebetween. Since only one piece of the conventional lens (i.e., the second lens) is used in the entire image pickup optical lens, the image pickup optical lens can be made to have a simpler structure than a general mobile phone lens.

According to an exemplary embodiment of the present application, the optical turning element may have positive optical power, and the incident surface thereof may be a convex surface and the exit surface thereof may be a convex surface.

According to an exemplary embodiment of the present application, the second lens may have a negative power, and the object-side surface may be concave and the image-side surface may be convex.

According to an exemplary embodiment of the present application, an optical turning element may have an incident surface, a reflective surface, and an exit surface. When the light from the object enters the optical turning element through the incident surface along the direction of the Y optical axis, the light can be totally reflected by the reflective surface to the emergent surface to be emitted along the direction of the X optical axis, and the light passes through the second lens E2 to finally form an image on the image forming surface. Wherein the Y optical axis is substantially perpendicular to the X optical axis. The reflection surface passes through an intersection of the Y-axis and the X-axis. The optical turning element can be configured into a turning prism which can enable the light rays incident to the optical turning element to deflect 90 degrees, compared with a conventional prism, the use of the prism can reduce the loss of light ray energy in an optical system and participate in the imaging of the whole optical system, so that the whole optical system can meet the requirements of small size and compact structure while meeting the characteristics of ultra-long effective focal length and high image quality.

In the embodiment of the present application, at least one of the incident surface and the exit surface of each lens is an aspherical surface, that is, at least one of the incident surface and the exit surface of the optical turning element and the object-side surface and the image-side surface of the second lens is an aspherical 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.

In an exemplary embodiment, the incident surface and the exit surface of the optical turning element may be aspheric mirror surfaces, and the reflective surface thereof is a planar mirror surface. The incident surface and the emergent surface of the optical turning element are both set to be aspheric mirror surfaces, so that the loss of ray energy in the optical system can be reduced, and the telephoto ratio of the system is facilitated.

In an exemplary embodiment, the image pickup optical lens of the present application may satisfy the conditional expression 20mm ≦ f ≦ 30mm, where f is the total effective focal length of the image pickup optical lens. F is more than or equal to 20mm and less than or equal to 30mm, and the requirement of an ultra-long effective focal length can be met; meanwhile, due to the use of the optical turning element, a small number of conventional lenses can be used, so that the structure is simple, and the requirements of small system size and compact structure can be met.

In an exemplary embodiment, the imaging optical lens of the present application may further include a diaphragm to improve the imaging quality of the lens. Alternatively, a diaphragm may be disposed between the subject and the optical turning element. The imaging optical lens according to the present application can satisfy the conditional expression 0mm < EPP < 0.1mm, where EPP is the distance between the diaphragm and the incident surface of the optical turning element on the X-ray axis. More specifically, the EPP may further satisfy 0mm < EPP < 0.05mm, for example, EPP ═ 0.03 mm. The diaphragm is arranged on the incident surface of the optical turning element, so that the light inlet quantity of the whole shooting optical system can be controlled; meanwhile, through selecting a proper diaphragm position, the aberration (coma, astigmatism, distortion and axial chromatic aberration) related to the diaphragm of the shooting optical lens can be effectively corrected.

In an exemplary embodiment, the image pickup optical lens of the present application may satisfy the conditional expression 1 < f/BFL < 1.5, where f is a total effective focal length of the image pickup optical lens, and BFL is a distance on the X-axis from an image side surface of the second lens to an imaging surface of the image pickup optical lens. More specifically, f and BFL may further satisfy 1.17 ≦ f/BFL ≦ 1.22. The f/BFL is more than 1 and less than 1.5, so that the shooting optical lens has an ultra-long effective focal length and an ultra-long back focal length, and the assembly of a lens later-stage module is facilitated.

In an exemplary embodiment, the image pickup optical lens of the present application may satisfy the conditional expression 1.5 < f/f1 < 2.0, where f is a total effective focal length of the image pickup optical lens, and f1 is an effective focal length of the optical turning element. More specifically, f and f1 further satisfy 1.59. ltoreq. f/f 1. ltoreq.1.90. Satisfying the conditional expression 1.5 < f/f1 < 2.0, the contribution of the effective focal length of the optical turning element to the total effective focal length of the whole lens can be effectively controlled, so that the total effective focal length of the lens reaches a larger ideal value.

In an exemplary embodiment, the image pickup optical lens of the present application may satisfy the conditional expression-1.0 < f/f2 < -0.5, where f is the total effective focal length of the image pickup optical lens, and f2 is the effective focal length of the second lens. More specifically, f and f2 further satisfy-0.93. ltoreq. f/f 2. ltoreq.0.61. Satisfying the conditional expression-1.0 < f/f2 < 0.5, the contribution of the effective focal length of the second lens to the total effective focal length of the whole lens can be effectively controlled, so that the total effective focal length of the lens reaches a larger ideal value.

In an exemplary embodiment, the imaging optical lens of the present application may satisfy the conditional expression 2.0 < EPD/ImgH ≦ 3.0, where EPD is an entrance pupil diameter of the imaging optical lens, and ImgH is a half of a diagonal length of an effective pixel region on an imaging surface of the imaging optical lens. More specifically, EPD and ImgH may further satisfy 2.29. ltoreq. EPD/ImgH. ltoreq.2.98. The condition expression that the EPD/ImgH is more than 2.0 and less than or equal to 3.0 is met, so that the lens has a larger field angle while meeting the performance of large caliber and high image quality.

In an exemplary embodiment, the imaging optical lens of the present application may satisfy the conditional expression 50 < (V1+ V2)/2 < 55, where V1 is an abbe number of the optical turning element and V2 is an abbe number of the second lens. More specifically, V1 and V2 can further satisfy 51.17 ≦ (V1+ V2)/2 ≦ 54.08. The conditional expression 50 < (V1+ V2)/2 < 55 is satisfied, so that the Abbe numbers of the two optical elements are in a required specific range, the vertical axis chromatic aberration, the axial chromatic aberration and the chromatic spherical aberration of the lens can be strongly corrected, and the image quality of the lens can be better ensured.

In an exemplary embodiment, the imaging optical lens of the present application may satisfy the conditional expression 0.15 ≦ N2-N1 < 0.3, where N1 is the refractive index of the optical turning element and N2 is the refractive index of the second lens. More specifically, N2 and N1 may further satisfy 0.16. ltoreq. N2 to N1. ltoreq.0.24. The difference between the refractive indexes of the optical turning element and the second lens is controlled within a small range, the materials of all lenses of the lens can be reasonably selected, and the difference between the focal powers of the lenses is controlled, so that the effective focal length can reach a required value, and meanwhile, the advantages of high image quality and small aberration of the lens can be ensured.

In an exemplary embodiment, the imaging optical lens of the present application may satisfy the conditional expression 10 ≦ f/CT2 ≦ 17, where f is the total effective focal length of the imaging optical lens, and CT2 is the center thickness of the second lens on the X-ray axis. More specifically, f and CT2 further satisfy 10.40 ≦ f/CT2 ≦ 16.50. Satisfying the conditional expression 10 ≤ f/CT2 ≤ 17, the lens can ensure effective focal length while satisfying processability.

The image pickup optical lens according to the above-mentioned embodiment of the present application may adopt a way of matching an optical turning element (i.e. a prism) with a conventional lens, for example, a way of matching a piece of prism with a piece of conventional lens 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 of the two optical elements, the volume of the lens can be effectively reduced, the sensitivity of the lens can be reduced, and the processability of the lens can be improved, so that the photographic optical lens is more beneficial to production and processing and can be suitable for portable electronic products. The camera optical lens with the configuration has the advantages of long focal length, miniaturization, high imaging quality and the like.

However, it will be appreciated by those skilled in the art that the number of prisms or lenses making up the image pick-up optical lens can be varied to achieve the various results and advantages described in this specification without departing from the claimed subject matter. For example, although two lenses are exemplified in the embodiment, the imaging optical lens is not limited to including two lenses. The pick-up optical lens may also comprise other numbers of lenses, if desired.

Specific examples of an image pickup optical lens applicable to the above-described embodiments are further described below with reference to the drawings.

Example 1

An imaging optical lens 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 image pickup optical lens according to embodiment 1 of the present application.

As shown in fig. 1, an imaging optical lens according to an exemplary embodiment of the present application includes, in order from an object side to an image side: a stop STO, an optical turning element E1, a second lens E2, and an image plane S6.

The optical turning element E1 is a folding prism having positive refractive power and having an incident surface S1, a reflecting surface S2 and an exit surface S3, wherein the incident surface S1 is a convex surface, the reflecting surface S2 is a flat surface, and the exit surface S3 is a convex surface. Light incident through the incident surface S1 along the Y optical axis is reflected by the reflecting surface S2 and then emitted through the emitting surface S3 along the X optical axis, wherein the Y optical axis is substantially perpendicular to the X optical axis and the reflecting surface S2 passes through the intersection of the Y optical axis and the X optical axis. The second lens element E2 has negative power, and has a concave object-side surface S4 and a convex image-side surface S5. The light from the object sequentially passes through the respective surfaces S1 to S5 and is finally imaged on the imaging surface S6.

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

TABLE 1

Where f is the total effective focal length of the image-taking optical lens, and ImgH is half the diagonal length of the effective pixel area on the imaging surface S6 of the image-taking optical lens.

In embodiment 1, the incident surface S1 and the exit surface S3 of the optical turning element E1 and the object-side surface and the image-side surface of the second lens E2 are aspheric, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the coefficients A of the high-order terms which can be used for the aspherical mirror surfaces S1, S3-S5 in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₄、A₂₆、A₂₈And A₃₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-1.3687E+05

1.1955E+05

-8.0967E+04

-4.3507E+04

-1.8553E+04

-6.1877E+03

-1.5655E+03

S3

1.0891E+06

9.1551E+05

5.8693E+05

2.9232E+05

1.1231E+05

3.2387E+04

6.6333E+03

S4

-1.0482E-01

-1.1401E-02

-2.6001E-03

-7.5613E-04

-2.5253E-04

-8.4576E-05

-3.0008E-05

S5

-8.2980E-02

-9.1698E-03

-2.1200E-03

-5.3659E-04

-9.3191E-05

3.1790E-05

4.7044E-05

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-2.8452E+02

-3.3463E+01

-1.9481E+00

6.4608E-03

-3.3828E-03

-4.4041E-03

-7.3579E-04

S3

8.6389E+02

5.3961E+01

4.7623E-04

1.1168E-03

-3.6774E-04

-1.1013E-03

-4.0667E-04

S4

-1.0895E-05

-3.5946E-06

-1.4297E-06

-4.8459E-07

0.0000E+00

S5

3.3772E-05

1.7689E-05

6.5769E-06

1.4078E-06

0.0000E+00

TABLE 2

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

Example 2

An imaging optical lens 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 configuration diagram of an image pickup optical lens according to embodiment 2 of the present application.

As shown in fig. 3, an imaging optical lens according to an exemplary embodiment of the present application, in order from an object side to an image side, includes: a stop STO, an optical turning element E1, a second lens E2, and an image plane S6.

Table 3 shows a basic parameter table of the image pickup optical lens of embodiment 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

S1

-1.4372E+05

-1.2552E+05

-8.5015E+04

-4.5682E+04

-1.9481E+04

-6.4970E+03

-1.6438E+03

S3

1.1435E+06

9.6128E+05

6.1628E+05

3.0694E+05

1.1793E+05

3.4006E+04

6.9650E+03

S4

-1.1006E-01

-1.1971E-02

-2.7301E-03

-7.9394E-04

-2.6516E-04

-8.8805E-05

-3.1509E-05

S5

-8.7130E-02

-9.6283E-03

-2.2260E-03

-5.6342E-04

-9.7850E-05

3.3379E-05

4.9396E-05

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-2.9875E+02

-3.5136E+01

-2.0455E+00

6.7839E-03

-3.5519E-03

-4.6243E-03

-7.7258E-04

S3

9.0708E+02

5.6659E+01

5.0004E-04

1.1726E-03

-3.8613E-04

-1.1563E-03

-4.2700E-04

S4

-1.1440E-05

-3.7743E-06

-1.5012E-06

-5.0881E-07

0.0000E+00

S5

3.5461E-05

1.8573E-05

6.9058E-06

1.4782E-06

0.0000E+00

TABLE 4

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

Example 3

An image pickup optical lens according to embodiment 3 of the present application is described below with reference to fig. 5 to 6D. Fig. 5 shows a schematic configuration diagram of an image pickup optical lens according to embodiment 3 of the present application.

As shown in fig. 5, the imaging optical lens according to the exemplary embodiment of the present application, in order from an object side to an image side, includes: a stop STO, an optical turning element E1, a second lens E2, and an image plane S6.

Table 5 shows a basic parameter table of the image-taking optical lens of embodiment 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

S1

1.3468E+03

1.1033E+03

6.8274E+02

3.2479E+02

1.1782E+02

3.1668E+01

5.9573E+00

S3

-1.5779E-03

-1.6321E-04

2.7048E-06

3.4719E-06

5.1364E-07

5.9902E-07

-9.1631E-07

S4

-1.4199E-01

-1.6231E-02

2.6513E-04

4.0609E-03

2.9483E-03

8.1776E-04

-2.5673E-04

S5

-1.8849E-01

-8.2261E-03

1.6199E-02

7.4657E-03

-2.7400E-03

-4.5025E-03

-1.4763E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

6.9995E-01

3.8758E-02

5.3948E-04

2.8035E-04

3.7128E-05

0.0000E+00

S3

-3.9265E-07

4.1946E-08

0.0000E+00

S4

-2.7002E-04

-3.5666E-05

4.1372E-05

1.5166E-05

0.0000E+00

S5

8.6137E-04

1.0797E-03

4.6701E-04

8.1484E-05

0.0000E+00

TABLE 6

Fig. 6A shows an on-axis chromatic aberration curve of the imaging optical lens of embodiment 3, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 6B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging optical lens of embodiment 3. Fig. 6C shows a distortion curve of the image-pickup optical lens of embodiment 3, which shows distortion magnitude values corresponding to different angles of view. Fig. 6D shows a chromatic aberration of magnification curve of the imaging optical lens of embodiment 3, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 6A to 6D, the imaging optical lens according to embodiment 3 can achieve good imaging quality.

Example 4

An image pickup optical lens according to embodiment 4 of the present application is described below with reference to fig. 7 to 8D. Fig. 7 shows a schematic configuration diagram of an image pickup optical lens according to embodiment 4 of the present application.

As shown in fig. 7, an imaging optical lens according to an exemplary embodiment of the present application, in order from an object side to an image side, includes: a stop STO, an optical turning element E1, a second lens E2, and an image plane S6.

Table 7 shows a basic parameter table of the image pickup optical lens of embodiment 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

S1

1.2243E+03

1.0030E+03

6.2068E+02

2.9527E+02

1.0711E+02

2.8788E+01

5.4157E+00

S3

-5.5908E-04

-2.2594E-04

6.8953E-05

-3.1945E-05

3.2269E-06

-2.8566E-05

-4.9552E-06

S4

-1.3274E-01

-1.4892E-02

4.5064E-04

4.1508E-03

2.6309E-03

4.2424E-04

-1.9909E-04

S5

-1.9225E-01

-3.3131E-03

1.6884E-02

5.5113E-03

-3.4949E-03

-3.5109E-03

-6.0871E-04

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

6.3654E-01

3.5160E-02

2.0824E-04

8.4103E-05

0.0000E+00

S3

3.2115E-06

-1.6384E-06

0.0000E+00

S4

-6.0144E-05

6.2912E-06

-7.4521E- 05

-4.7944E-05

0.0000E+00

S5

6.4829E-04

4.1537E-04

5.7855E-05

-1.4287E-05

0.0000E+00

TABLE 8

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

Example 5

An imaging optical lens according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D. Fig. 9 shows a schematic configuration diagram of an image pickup optical lens according to embodiment 5 of the present application.

As shown in fig. 9, an imaging optical lens according to an exemplary embodiment of the present application, in order from an object side to an image side, includes: a stop STO, an optical turning element E1, a second lens E2, and an image plane S6.

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

TABLE 9

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

1.8365E+03

1.5045E+03

9.3101E+02

4.4290E+02

1.6067E+02

4.3183E+01

8.1236E+00

S3

-1.6393E-03

-1.7226E-04

1.5864E-05

9.7281E-06

4.6610E-06

-3.5075E-06

-2.5867E-06

S4

-2.0007E-01

-2.2257E-02

8.8921E-04

6.1072E-03

3.8401E-03

7.6928E-04

-2.8309E-04

S5

-2.8307E-01

-6.7107E-03

2.5762E-02

8.5231E-03

-5.3640E-03

-5.3607E-03

-8.8538E-04

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

9.5473E-01

5.2769E-02

3.7512E-04

1.4773E-04

0.0000E+00

S3

6.4553E-07

-2.4676E-07

0.0000E+00

S4

-1.5291E-04

-4.2934E-05

-6.5103E-05

-3.4630E-05

0.0000E+00

S5

1.0342E-03

6.4615E-04

9.6649E-05

-1.7399E-05

0.0000E+00

Watch 10

Fig. 10A shows an on-axis chromatic aberration curve of the imaging optical lens of embodiment 5, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 10B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging optical lens of embodiment 5. Fig. 10C shows a distortion curve of the image-pickup optical lens of example 5, which shows distortion magnitude values corresponding to different angles of view. Fig. 10D shows a chromatic aberration of magnification curve of the imaging optical lens of embodiment 5, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 10A to 10D, the imaging optical lens according to embodiment 5 can achieve good imaging quality.

In summary, examples 1 to 5 satisfy the relationships shown in table 11, respectively.

Conditions/examples	1	2	3	4	5
						EPP(mm)	0.03	0.03	0.03	0.03	0.03
f/BFL	1.22	1.22	1.22	1.17	1.20
						f/f1	1.90	1.90	1.66	1.59	1.62
f/f2	-0.93	-0.93	-0.69	-0.61	-0.64
						EPD/ImgH	2.84	2.98	2.39	2.29	2.29
(V1+V2)/2	54.08	54.08	53.58	51.17	51.17
						N2-N1	0.16	0.16	0.21	0.24	0.24
f/CT2	10.40	10.40	11.51	16.50	13.25

TABLE 11

The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the above-described image pickup optical lens.

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

Claims

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

an optical turning element having a focal power and having an incident surface, a reflecting surface, and an exit surface, the incident surface and the exit surface being aspheric mirror surfaces, the reflecting surface being a planar mirror surface, and the optical turning element being configured such that light incident on the optical turning element through the incident surface in a direction of a Y optical axis is reflected by the reflecting surface and then exits through the exit surface in a direction of an X optical axis, wherein the direction of the Y optical axis and the direction of the X optical axis cross each other; and

a second lens having an optical power, an

The total effective focal length f of the shooting optical lens meets the condition that f is more than or equal to 20mm and less than or equal to 30 mm.

2. The imaging optical lens according to claim 1, wherein the Y optical axis is substantially perpendicular to the X optical axis.

3. An imaging optical lens according to claim 1, characterized in that the imaging optical lens further comprises a diaphragm disposed between the object side and the optical turning element, and

the distance EPP between the diaphragm and the incident surface of the optical turning element on the X-ray axis meets the requirement that EPP is more than 0mm and less than 0.1 mm.

4. The image-pickup optical lens according to claim 1, wherein a total effective focal length f of the image-pickup optical lens and a distance BFL on the X optical axis from an image-side surface of the second lens to an imaging surface of the image-pickup optical lens satisfy 1 < f/BFL < 1.5.

5. The imaging optical lens according to claim 1, wherein a total effective focal length f of the imaging optical lens and an effective focal length f1 of the optical turning element satisfy 1.5 < f/f1 < 2.0.

6. The image-pickup optical lens according to claim 1, wherein a total effective focal length f of the image-pickup optical lens and an effective focal length f2 of the second lens satisfy-1.0 < f/f2 < -0.5.

7. The imaging optical lens according to claim 1, characterized in that an entrance pupil diameter EPD of the imaging optical lens and a half ImgH of a diagonal length of an effective pixel region on an imaging surface of the imaging optical lens satisfy 2.0 < EPD/ImgH ≦ 3.0.

8. The imaging optical lens according to claim 1, wherein an abbe number V1 of the optical turning element and an abbe number V2 of the second lens satisfy 50 < (V1+ V2)/2 < 55.

9. The imaging optical lens according to claim 1, wherein a refractive index N1 of the optical turning element and a refractive index N2 of the second lens satisfy 0.15 ≦ N2-N1 < 0.3.

10. The imaging optical lens according to claim 1, wherein a total effective focal length f of the imaging optical lens and a center thickness CT2 of the second lens on the X-axis satisfy 10 ≦ f/CT2 ≦ 17.