CN110794557A

CN110794557A - Image pickup apparatus

Info

Publication number: CN110794557A
Application number: CN201911200263.6A
Authority: CN
Inventors: 戴付建; 张凯元; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-02-14
Also published as: WO2021103862A1

Abstract

The application discloses a camera device, which comprises a first camera module and a second camera module, wherein the second camera module is an off-axis three-mirror camera module; wherein the equivalent focal length f1 of the first camera module and the equivalent focal length f2 of the second camera module satisfy: f2/f1>20, and the equivalent focal length f2 of the second camera module meets the following conditions: 401mm < f2<411 mm.

Description

Image pickup apparatus

Technical Field

The present application relates to the field of optical elements, and in particular, to an image pickup apparatus.

Background

With the continuous development of miniaturized electronic devices such as smart phones, the built-in camera devices have a trend of high resolution, large field of view, light weight, and multiple functionality. The characteristics of the optical imaging lens built in the image pickup device are mainly reflected in large caliber, long focal length, wide field of view, high image quality, low distortion, compact structure and the like. In order to adapt to the development of electronic devices, the market needs an image pickup apparatus integrated with an optical imaging lens having advantages of a large aperture, a long focal length, a wide field of view, and the like.

Disclosure of Invention

An aspect of the present application provides an image pickup apparatus including: a first camera module; the second camera shooting module is an off-axis three-mirror camera shooting module; wherein the equivalent focal length f1 of the first camera module and the equivalent focal length f2 of the second camera module satisfy: f2/f1>20, and the equivalent focal length f2 of the second camera module meets the following conditions: 401mm < f2<411 mm.

In one embodiment, the first image capturing module, in order from an object side to an image side along a first optical axis, comprises: a first lens having an optical power; the second lens with positive focal power has a convex object-side surface and a concave image-side surface; a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the fourth lens with negative focal power has a concave object-side surface and a convex image-side surface; a fifth lens with focal power, wherein the image side surface of the fifth lens is convex; a sixth lens having optical power; and a seventh lens having a negative optical power.

In one embodiment, the clear aperture of the second camera module is a rectangular aperture.

In one embodiment, the entrance pupil diameter EPD of the second camera module is 8.5 mm.

In one embodiment, the module size D of the second camera module satisfies: d is less than or equal to 25mm multiplied by 25 mm.

In one embodiment, the second camera module comprises: a first reflector; the second reflector is arranged on the reflection light path of the first reflector; the third reflector is arranged on a reflection light path of the second reflector; wherein a central normal of the first mirror, a central normal between the second mirrors, and a central normal of the third mirror all intersect.

In one embodiment, the second camera module further comprises: and the image sensor is arranged on a reflection light path of the third reflector and is positioned on an imaging surface of the second camera module.

In one embodiment, further comprising an aperture stop disposed at the first mirror.

In one embodiment, the reflecting surface of each of the first to third reflecting mirrors is a polynomial free-form surface.

In one embodiment, the radius of curvature R1 of the reflective surface of the first mirror, the radius of curvature R2 of the reflective surface of the second mirror, and the radius of curvature R3 of the reflective surface of the third mirror satisfy: 100 x I1/R1 + 1/R2-1/R3I is less than or equal to 0.1.

In one embodiment, a distance d1 from the center of the first mirror to the center of the second mirror, a distance d2 from the center of the second mirror to the center of the third mirror, and a distance d3 from the center of the third mirror to the imaging plane of the second camera module satisfy: 17mm < (d1+ d2+ d3)/3<19 mm.

The application provides a camera device adopts two module settings of making a video recording. The equivalent focal length of the first camera module and the second camera module is reasonably set, and the optical zoom magnification of the camera device is reasonably set, so that the camera device has good imaging quality while having a large caliber, a long focal length and a wide view field.

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 apparatus according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a first camera module according to embodiment 1 of the present application;

fig. 3A to 3D respectively show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the first camera module of embodiment 1;

fig. 4 is a schematic structural diagram of a first camera module according to embodiment 2 of the present application;

fig. 5A to 5D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the first camera module of embodiment 2;

fig. 6 is a schematic structural diagram showing a second camera module according to embodiment 3 of the present application.

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.

Fig. 1 shows a schematic configuration diagram of an image pickup apparatus according to an embodiment of the present application. As shown in fig. 1, the image pickup apparatus includes: the camera comprises a first camera module and a second camera module, wherein the second camera module is an off-axis three-mirror camera module. The off-axis three-mirror camera module has the advantages of no chromatic aberration, no obstruction, large view field, high image quality and convenience in folding the light path. In this embodiment, the second camera module adopts an off-axis three-mirror camera module, which is beneficial to realizing the long focal length and wide view field characteristics of the camera device. The first camera module and the second camera module are matched to be arranged, so that the imaging quality of the camera device is improved.

In an exemplary embodiment, the first image capturing module, in order from an object side to an image side along a first optical axis, includes: a first lens having an optical power; the second lens with positive focal power has a convex object-side surface and a concave image-side surface; a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the fourth lens with negative focal power has a concave object-side surface and a convex image-side surface; a fifth lens with focal power, wherein the image side surface of the fifth lens is convex; a sixth lens having optical power; and a seventh lens having a negative optical power.

In an exemplary embodiment, the equivalent focal length f1 of the first camera module and the equivalent focal length f2 of the second camera module satisfy: f2/f1> 20. The optical zoom magnification of the camera device is reasonably increased, which is beneficial to enlarging the focus area of the wide-angle end and the telephoto end and improving the imaging quality of the camera device for shooting at an extra-long distance.

In an exemplary embodiment, the equivalent focal length f2 of the second camera module satisfies: 401mm < f2<411 mm. The equivalent focal length of the second camera module is set within a reasonable focal length range, so that the equivalent focal length meets the above conditions, and the long-focus characteristic of the camera device is favorably realized.

In an exemplary embodiment, the clear aperture of the second camera module is a rectangular aperture.

In an exemplary embodiment, the entrance pupil diameter EPD of the second camera module is 8.5 mm. The entrance pupil diameter of the second camera module is reasonably set, so that the light inlet quantity of the optical system can be controlled, and the characteristics of high pixel and large caliber of the optical system can be realized.

In an exemplary embodiment, the module size D of the second camera module satisfies: d is less than or equal to 25mm multiplied by 25 mm. The reasonable module size that sets up the second module of making a video recording makes it be less than 25mm, is favorable to making camera device have the characteristics of undersize simultaneously when satisfying high image quality, overlength focal length for the device structure is compacter, miniaturized. The module size D specifically refers to a surface size of the second camera module exposed on the camera device carrier after the second camera module is installed in the camera device.

In an exemplary embodiment, the second camera module includes: a first reflector; the second reflector is arranged on the reflection light path of the first reflector; the third reflector is arranged on the reflection light path of the second reflector; and the central normal of the first reflector, the central normal between the second reflectors and the central normal of the third reflector are intersected. The position relation of the three reflectors is reasonably set, and the optical path in the camera device is convenient to fold.

In an exemplary embodiment, the second camera module further comprises: and the image sensor is arranged on the reflection light path of the third reflector and is positioned on the imaging surface of the second camera module.

In an exemplary embodiment, further comprising an aperture stop, the aperture stop being arranged at the first mirror.

In an exemplary embodiment, the reflecting surface of each of the first to third reflecting mirrors is a polynomial free-form surface. The ever-increasing market demands for imaging performance and quality of imaging devices have created significant challenges for conventional aspheric optical systems. The free-form surface optical element has a non-rotationally symmetrical surface type, can optimize the degree of freedom to the maximum extent, is beneficial to improving the capacity of an optical system for balancing high-order and off-axis aberration, widens the effective view field of the optical system, and can make the structural layout of the optical system more flexible. In this embodiment, the second camera module uses three mirrors to fold the light path. The reflecting surfaces of the three reflectors are all polynomial free-form surfaces, so that the optical system meets the requirements of small size and compact structure while meeting the characteristics of ultra-long focal length and high image quality.

In an exemplary embodiment, the radius of curvature R1 of the reflective surface of the first mirror, the radius of curvature R2 of the reflective surface of the second mirror, and the radius of curvature R3 of the reflective surface of the third mirror satisfy: 100 x I1/R1 + 1/R2-1/R3I is less than or equal to 0.1. The mutual relation of the curvature radius of the reflecting surface of the first reflecting mirror, the curvature radius of the reflecting surface of the second reflecting mirror and the curvature radius of the reflecting surface of the third reflecting mirror is reasonably set, so that the mutual relation meets the conditions, the shape of the three reflecting mirrors is favorably restrained, the aberration contribution rates of the three reflecting mirrors are further controlled, the optical system and the aperture zone related aberration are effectively balanced, and the imaging quality of the optical system is improved.

In an exemplary embodiment, a distance d1 from the center of the first mirror to the center of the second mirror, a distance d2 from the center of the second mirror to the center of the third mirror, and a distance d3 from the center of the third mirror to the imaging plane of the second camera module satisfy: 17mm < (d1+ d2+ d3)/3<19 mm. The distance of the center of rationally setting up first speculum to the center of second speculum, the center of second speculum to the distance at the center of third speculum and the center of third speculum to the mutual relation between the distance of the imaging surface of second camera module, make it satisfy above-mentioned condition in order to control the distance between the above-mentioned three speculum at certain extent, both do benefit to camera device and have the optical characteristic and the compact system structure of overlength focus, the super little structural feature of size, be favorable to camera device's processing equipment again.

According to the camera device of this application adopt the three trans modules of making a video recording of off-axis, compact structure, size are little, equivalent focal length reaches 406mm and have characteristics such as bore heavy, image quality height concurrently. The optical zoom multiple can reach more than 20 times.

Exemplary embodiments of the present application also provide an electronic apparatus including the image pickup device described above.

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

Example 1

A first image pickup module according to embodiment 1 of the present application is described below with reference to fig. 2 to 3D. Fig. 2 is a schematic diagram showing a configuration of a first camera module according to embodiment 1 of the present application.

As shown in fig. 2, the first image capturing module sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.

The first lens element E1 has positive power, and has a concave object-side surface S1 and a convex image-side surface S2. 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 positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

Table 1 shows a basic parameter table of the first camera module of embodiment 1, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).

TABLE 1

In the present embodiment, the total effective focal length f of the first camera module is 4.40mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 is 6.87mm, and the half ImgH of the diagonal length of the effective pixel area on the imaging surface S17 is 4.70 mm.

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the seventh lens E7 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 coefficient A of each of the aspherical mirror surfaces S1 to S14 used in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

1.9050E-02

2.7201E-04

-9.8131E-04

4.3070E-04

-7.4331E-05

0.0000E+00

S2

2.8303E-02

-1.1794E-03

-5.0756E-04

7.5537E-04

-1.7796E-04

0.0000E+00

S3

2.7064E-03

-1.7680E-02

3.8132E-02

-5.4951E-02

4.3550E-02

-1.8077E-02

3.1657E-03

0.0000E+00

S4

3.6584E-02

-9.1771E-02

1.1953E-01

-1.2835E-01

9.7366E-02

-4.3384E-02

8.9052E-03

0.0000E+00

S5

-2.4924E-02

3.4395E-03

-4.7643E-02

9.9075E-02

-1.2016E-01

8.4775E-02

-3.1738E-02

4.9355E-03

0.0000E+00

S6

-3.8125E-02

5.8806E-03

-5.1176E-02

9.9500E-02

-1.1000E-01

7.1963E-02

-2.5573E-02

3.7982E-03

0.0000E+00

S7

-8.9961E-02

5.8110E-02

-1.5929E-01

2.5728E-01

-2.7062E-01

1.9684E-01

-9.2037E-02

2.4328E-02

-2.7134E-03

S8

-7.5962E-02

7.3692E-02

-9.0669E-02

7.0023E-02

-3.3597E-02

1.0110E-02

-1.7669E-03

1.3526E-04

2.0521E-06

S9

-8.8807E-02

1.7029E-01

-1.4507E-01

7.3092E-02

-2.2318E-02

3.6937E-03

-1.7331E-04

-3.6689E-05

4.5046E-06

S10

-2.7462E-02

4.8371E-02

-4.3015E-02

2.2157E-02

-6.4095E-03

9.1906E-04

-2.6559E-05

-7.9555E-06

6.7279E-07

S11

1.2183E-01

-8.0709E-02

2.5750E-02

-4.9618E-03

5.7384E-04

-4.2180E-05

2.5507E-06

-1.4435E-07

4.3934E-09

S12

9.5135E-02

-6.9531E-02

2.4069E-02

-5.3251E-03

7.8592E-04

-7.7085E-05

4.8209E-06

-1.7337E-07

2.7167E-09

S13

-2.7673E-02

-1.8679E-02

8.3315E-03

-1.5247E-03

1.5926E-04

-1.0180E-05

3.9441E-07

-8.5158E-09

7.8626E-11

S14

-4.0948E-02

4.6734E-03

2.2449E-05

-6.4986E-05

7.2317E-06

-3.4139E-07

4.9822E-09

1.2912E-10

-3.8108E-12

TABLE 2

Fig. 3A shows an on-axis chromatic aberration curve of the first imaging module of embodiment 1, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 3B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the first image pickup module of embodiment 1. Fig. 3C shows a distortion curve of the first image pickup module of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 3D shows a chromatic aberration of magnification curve of the first image capture module of embodiment 1, which represents a deviation of different image heights on the image plane after the light passes through the lens. As can be seen from fig. 3A to 3D, the first camera module according to embodiment 1 can achieve good imaging quality.

Example 2

A first image pickup module according to embodiment 2 of the present application is described below with reference to fig. 4 to 5D. Fig. 4 is a schematic structural diagram showing a first camera module according to embodiment 2 of the present application.

As shown in fig. 4, the first image capturing module, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface S17.

The first lens element E1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a concave object-side surface S13 and a convex image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

In the present embodiment, the total effective focal length f of the first camera module is 3.49mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 is 8.40mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 is 4.00 mm.

Table 3 shows a basic parameter table of the first camera module of embodiment 2, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).

TABLE 3

In embodiment 2, both the object-side surface and the image-side surface of any one of the first lens E1 through the seventh lens E7 are aspheric. The high-order term coefficients A that can be used for the aspherical mirror surfaces S1 through S14 in example 2 are shown in the following tables 4-1 and 4-2₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₄、A₂₆、A₂₈And A₃₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-2.6814E-01

-1.0752E-01

3.2206E-02

-2.3568E-02

5.0175E-04

1.6683E-03

-1.8986E-03

S2

-8.5673E-01

1.7221E-03

-8.0437E-02

-2.8426E-03

-1.6371E-02

-3.7299E-04

-3.1485E-03

S3

-4.4235E-02

-3.6236E-02

5.8673E-03

1.5246E-03

5.9492E-04

-3.8658E-04

-8.2181E-05

S4

-6.7395E-03

3.0630E-02

-2.2317E-02

8.7022E-03

-2.3995E-03

3.6389E-04

-1.7406E-04

S5

2.5612E-02

-1.7995E-02

7.1939E-03

-2.8332E-03

9.9992E-04

-2.9205E-04

4.9631E-05

S6

1.1946E-01

-2.8693E-02

2.3852E-02

-9.7993E-03

4.5305E-03

-1.3900E-03

3.2803E-04

S7

1.0267E-01

9.2995E-02

-7.6032E-03

3.2625E-03

3.0226E-04

7.0557E-04

-8.3791E-04

S8

-4.6882E-02

1.3585E-01

-2.3221E-02

1.0411E-02

8.7203E-04

-3.1439E-04

-4.6633E-05

S9

3.0221E-01

-3.4485E-01

1.7846E-01

-7.4016E-02

2.8757E-02

-1.1063E-02

5.6324E-03

S10

2.8087E-03

-2.0533E-01

3.4350E-01

1.3620E-01

-4.9014E-02

3.3952E-04

1.2303E-02

S11

1.1689E+00

6.8997E-01

-3.8496E-01

7.5093E-02

7.8220E-02

-5.3261E-02

2.4763E-02

S12

5.7175E-01

-1.5912E-02

-2.3083E-01

6.4630E-02

-1.6080E-01

-6.0984E-02

-1.1698E-02

S13

-5.6738E-01

1.0288E-01

2.9204E-01

4.0081E-01

3.5220E-01

5.3871E-02

-5.5655E-02

S14

1.5684E+00

8.2811E-01

1.7512E-01

3.0571E-01

3.2908E-01

-1.1019E-02

8.3132E-02

TABLE 4-1

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

5.4650E-04

-6.5455E-05

-4.6624E-06

2.5341E-07

0.0000E+00

S2

-7.8640E-05

-6.1467E-04

6.8682E-06

-3.1071E-07

0.0000E+00

S3

6.9910E-06

3.4483E-05

0.0000E+00

S4

8.5224E-05

-5.2070E-05

1.1723E-07

0.0000E+00

S5

5.1687E-06

-1.4925E-05

0.0000E+00

S6

-7.8163E-05

1.1328E-05

8.2744E-07

-1.1189E-07

0.0000E+00

S7

3.7219E-04

-3.6688E-05

2.3183E-07

0.0000E+00

S8

7.8973E-05

5.2803E-06

0.0000E+00

S9

-1.5235E-03

8.6312E-04

1.8142E-06

0.0000E+00

S10

4.1278E-03

-4.4582E-03

1.1027E-04

-9.6542E-06

0.0000E+00

S11

2.2256E-03

-8.2457E-03

6.9737E-03

-3.4953E-03

7.5514E-04

6.7114E-08

0.0000E+00

S12

-1.8692E-02

-6.2488E-04

-4.1981E-03

1.1455E-03

5.8921E-04

-3.9008E-07

1.0125E-07

S13

-3.9157E-02

-1.8901E-02

-1.3886E-02

-6.5433E-03

-1.4971E-03

-2.9297E-06

0.0000E+00

S14

1.6924E-02

-9.9340E-04

1.5116E-02

-3.4394E-03

2.8377E-03

-8.4166E-06

7.0375E-08

TABLE 4-2

Fig. 5A shows an on-axis chromatic aberration curve of the first imaging module of embodiment 2, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 5B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the first image pickup module of embodiment 2. Fig. 5C shows a distortion curve of the first image pickup module of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 5D shows a chromatic aberration of magnification curve of the first image pickup module of embodiment 2, which represents a deviation of different image heights on the image plane after the light passes through the lens. As can be seen from fig. 5A to 5D, the first camera module according to embodiment 2 can achieve good imaging quality.

Example 3

Fig. 6 shows a schematic structural diagram of a second camera module according to an embodiment of the present application. As shown in fig. 6, the second camera module includes a first reflector, a second reflector and a third reflector.

Table 5 shows a basic parameter table of the second camera module of the embodiment, in which the unit of the curvature radius and the pitch is millimeters (mm).

Mirror surface	Radius of curvature (mm)	Spacing (mm)
			First reflector	516.919	18.3054
Second reflecting mirror	462.8957	-17.3559
			Third reflector	274.264	17.2310

TABLE 5

In embodiment 3, the reflecting surface of any one of the first to third reflecting mirrors is a polynomial free-form surface, and the surface type z of each reflecting mirror can be defined by, but is not limited to, the following free-form surface formula:

wherein z is the high sagittal amount of the free form surface at (x, y); c is the high quantity of the curved surface vector, and k is the coefficient of a quadratic surface; ai is the coefficient of the ith term of the free-form surface. Table 6 below shows the coefficients A of the higher-order terms of the respective curved mirror surfaces of the first to third mirrors usable in example 1₂、A₃、A₅、A₇、A₉、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₁、A₂₃、A₂₅、A₂₇、A₂₉、A₃₁、A₃₃And A₃₅。

Flour mark	First reflector	Second reflecting mirror	Third reflector
				Conic
	0	0	0
				A2	0.089600019	0.119386772	-0.869316942
A3	-0.003646736	0.002521435	-0.001516475
				A5	-0.001087685	0.006712899	0.013053386
A7	1.2154E-05	2.57827E-05	0.000142666
				A9	3.70324E-06	-2.97325E-05	-0.000646299
A10	1.06422E-06	2.75124E-06	9.98773E-06
				A12	3.00643E-06	5.44257E-06	5.27422E-05
A14	1.74917E-06	2.82511E-06	7.21893E-05
				A16	1.09838E-08	-2.97813E-08	-1.60345E-07
A18	4.27895E-08	-4.52594E-08	-8.76074E-07
				A20	1.67203E-08	-6.46964E-09	-3.32375E-06
A21	-6.38452E-10	-5.79454E-10	-2.44871E-08
				A23	1.37858E-08	1.1219E-08	1.80159E-07
A25	1.52653E-08	3.12358E-09	2.41813E-07
				A27	6.56265E-09	2.27602E-09	5.76627E-07
A29	1.47575E-09	3.36256E-09	7.24949E-08
				A31	8.56437E-10	1.17149E-09	1.253E-08
A33	9.29792E-12	1.45006E-09	-1.44111E-07
				A35	8.29675E-11	2.69993E-10	-6.84834E-08

TABLE 6

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. An image pickup apparatus, comprising:

a first camera module; and

the second camera shooting module is an off-axis three-mirror camera shooting module;

wherein the equivalent focal length f1 of the first camera module and the equivalent focal length f2 of the second camera module satisfy: f2/f1>20, and the equivalent focal length f2 of the second camera module meets the following conditions: 401mm < f2<411 mm.

2. The imaging device of claim 1, wherein the first imaging module comprises, in order from an object side to an image side along a first optical axis:

a first lens having an optical power;

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

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

the fourth lens with negative focal power has a concave object-side surface and a convex image-side surface;

a fifth lens with focal power, wherein the image side surface of the fifth lens is convex;

a sixth lens having optical power; and

a seventh lens having a negative optical power.

3. The image capturing apparatus according to claim 1, wherein the clear aperture of the second image capturing module is a rectangular aperture.

4. The camera device of claim 1, wherein the second camera module has an entrance pupil diameter EPD of 8.5 mm.

5. The image pickup apparatus according to claim 1, wherein a module size D of the second image pickup module satisfies:

D≤25mm×25mm。

6. the image pickup apparatus as set forth in any one of claims 1 to 5, wherein the second image pickup module includes:

a first reflector;

the second reflector is arranged on the reflection light path of the first reflector; and

the third reflector is arranged on a reflection light path of the second reflector; wherein a central normal of the first mirror, a central normal between the second mirrors, and a central normal of the third mirror all intersect.

7. The image pickup apparatus according to claim 6, wherein said second image pickup module further comprises: and the image sensor is arranged on a reflection light path of the third reflector and is positioned on an imaging surface of the second camera module.

8. The image pickup apparatus according to claim 6, further comprising an aperture stop provided at said first reflecting mirror.

9. The image pickup apparatus according to claim 6, wherein the reflection surface of each of the first to third reflection mirrors is a polynomial free-form surface.

10. The image pickup apparatus according to claim 6, wherein a curvature radius R1 of the reflection surface of the first mirror, a curvature radius R2 of the reflection surface of the second mirror, and a curvature radius R3 of the reflection surface of the third mirror satisfy:

100×|1/R1+1/R2-1/R3|≤0.1。