WO2018192579A1

WO2018192579A1 - Camera module

Info

Publication number: WO2018192579A1
Application number: PCT/CN2018/083981
Authority: WO
Inventors: 郑志羿; 袁亮; 罗朝兵
Original assignee: 华为技术有限公司
Priority date: 2017-04-21
Filing date: 2018-04-20
Publication date: 2018-10-25
Also published as: CN106973203B; CN106973203A

Abstract

The present disclosure relates to the technical field of electronics. Provided is a camera module. The camera module comprises: a spherical lens and a spherical image sensor. The spherical lens comprises a first lens surface and a second lens surface. The first lens surface is a convex spherical surface. The surface of a photosensitive component provided in the spherical image sensor is a concave spherical surface. An imaging surface is formed on the surface provided with the photosensitive component, the imaging surface is a concave spherical surface, and the curvature of the imaging surface is equal to the curvature of the surface provided with the photosensitive component. The present disclosure allows aberration correction.

Description

Camera module

This application claims the priority of the Chinese Patent Application, filed on Apr. 21, 2017, the entire disclosure of which is hereby incorporated by reference.

Technical field

The present disclosure relates to the field of electronic technologies, and in particular, to a camera module.

Background technique

With the continuous development of electronic technology, electronic devices such as mobile phones and tablet computers are widely used in people's daily life. Considering that the camera function is deeply loved by users, most of the current electronic devices will be equipped with camera modules through camera modules. The group performs the camera.

As shown in FIG. 1 , the camera module includes a spherical lens 101 , an image sensor 102 , and a casing 103 . During the process of capturing the object by the camera module, the surface of the object facing the camera module is a object surface. The point inside is called an object point, and the spherical lens 101 is used to refract the light signal reflected by each object point in the object surface onto the surface 1021 of the image sensor on which the photosensitive device is disposed, and the surface 1021 on which the photosensitive device is disposed is based on the received light signal. Generate an image of the subject.

For a certain object point, the light signals of different directions reflected by the object point are condensed by the spherical lens 101, and then converge at a point, which is called the focus corresponding to the object point. By adjusting the position of the surface 1021 in which the photosensitive device is disposed, the process of dropping the focus on the surface 1021 on which the photosensitive device is disposed is referred to as focusing, and it is possible to ensure that the image formed by the object point is clear after focusing. As shown in FIG. 2, the object point A corresponds to the focus A1, and when the focus A1 falls on the surface 1021 on which the photosensitive device is disposed by focusing, the image formed by the object point A is clear.

However, there are a plurality of object points in any object surface, and a surface composed of a plurality of focus points corresponding to a plurality of object points is called an image plane. As shown in FIG. 3, for the object point A, the object point B, and the object point C which belong to the same object surface and the distance from the optical axis is different, the image plane composed of the focus A1, the focus B1, and the focus C1 is a curved surface. . Then, when focusing on the object point A such that the focus A1 falls on the surface 1021 on which the photosensitive device is disposed, since the focus B1 and the focus C1 do not fall on the surface 1021 on which the photosensitive device is disposed, the object point B and the object point are caused. The image formed by C is distorted, and the resulting image is sharply centered and surrounded by distortion. Similarly, when focusing on object point B, the resulting image will be sharp and center-distorted. That is, regardless of which object point of the object is focused, there is always an aberration between the generated image and the object image, resulting in poor imaging of the camera module.

Summary of the invention

The embodiment of the present disclosure provides a camera module, which can solve the problem of poor imaging performance of the camera module in the related art, and the camera module includes: a spherical lens and a spherical image sensor;

The spherical lens includes a first mirror surface and a second mirror surface, the first mirror surface is a convex spherical surface, and a convex direction of the first mirror surface is away from the second mirror surface, and the second mirror surface is a plane or a convex surface a spherical surface, in a case where the second mirror surface is a convex spherical surface, a convex direction of the second mirror surface is away from the first mirror surface;

a surface of the spherical image sensor in which the photosensitive device is disposed is a concave spherical surface, and an opening of the concave spherical surface faces the second mirror surface, and an optical axis of the spherical lens and a central axis of the surface on which the photosensitive device is disposed are in the same Straight line

The convex spherical surface refers to a spherical surface whose outer surface is a reflecting surface, and the concave spherical surface refers to a spherical surface whose inner surface is a reflecting surface.

The first mirror surface is for receiving an optical signal reflected by each object point on the object surface of the object to be photographed, and the second mirror surface is for refracting the light signal to the surface on which the photosensitive device is disposed, The object surface refers to a surface of the object facing the first mirror surface, and a point in the object plane is an object point;

The surface of the photosensitive device is configured to generate an image surface corresponding to the object surface according to the light signal, and the image surface is formed on the surface on which the photosensitive device is disposed, and the image surface is also A concave spherical surface, and the curvature of the image surface is equal to the curvature of the surface on which the photosensitive device is disposed.

In this implementation manner, since the curvature of the surface of the image sensor in which the image sensor is disposed is equal to the curvature of the image plane corresponding to the object surface, the focus corresponding to each object point can be dropped regardless of which object point of the object surface is focused. On the surface on which the photosensitive device is disposed, the image generated by each object point is ensured to be clear, the aberration is corrected, and the imaging effect of the camera module is improved.

In a first possible implementation, the spherical image sensor further includes an upper side surface, a lower side surface, and a back spherical surface opposite to the surface on which the photosensitive device is disposed;

The upper side surface and the lower side surface are respectively parallel to a central axis of the surface on which the photosensitive member is disposed, and a curvature of the back spherical surface is equal to a curvature of a surface on which the photosensitive device is disposed.

In a second possible implementation, the camera module further includes: a telephoto lens group, the telephoto lens group is located between the spherical lens and the spherical image sensor, and the telephoto lens group respectively Separating from the spherical lens and the spherical image sensor, the telephoto lens group includes at least one lens, and an optical axis of each of the at least one lens is in line with an optical axis of the spherical lens;

The adder lens group is used to increase the focal length of the camera module.

In the present implementation, by providing the telephoto lens group, the focal length of the camera module can be increased, and the image distortion caused when the spherical lens captures the object surface can be corrected.

In a third possible implementation, the adder lens group includes a plurality of lenses, and a curvature of a mirror surface of each of the plurality of lenses toward the spherical lens is different from each of the other lenses toward the spherical lens. The curvature of the mirror.

In a fourth possible implementation, the camera module further includes a first lens barrel, the first lens barrel has a first through hole, and the spherical lens and the distance increasing lens group are located at the first a through hole, the spherical image sensor being located outside the first barrel, and an optical axis of the spherical lens, a central axis of the surface on which the photosensitive device is disposed, and each lens in the pair of lens units The optical axis and the central axis of the first through hole are all on the same straight line;

The inner diameter of the first through hole is less than or equal to 5 mm, and an inner diameter of the first through hole is larger than a larger value of a height value of the spherical lens and a height value of the distance increasing lens group, the spherical surface The height direction of the lens and the height direction of the camera module are both perpendicular to the linear direction in which the optical axis of the spherical lens is located.

In a fifth possible implementation manner, the first equivalent focal length of the camera module is greater than or equal to 20% of a radius of curvature of the surface on which the photosensitive device is disposed, and the first equivalent focal length refers to The distance between the focal point of the virtual lens and the center of the virtual lens when the spherical lens and the adder lens group are equivalent to one virtual lens, and the first equivalent focal length is according to the spherical lens a focal length, a focal length of the increasing lens group, and a distance between the spherical lens and the increasing lens group are determined based on a preset simulation algorithm;

In this implementation manner, the first equivalent focal length of the camera module may be greater than 20% of the radius of curvature of the spherical image sensor, thereby satisfying the requirement of the user to shoot a distant object surface.

a ratio between the first equivalent focal length and a first optical path length of the camera module is greater than or equal to 1.5, the first optical path length being between the surface on which the photosensitive device is disposed and the first mirror surface The maximum distance.

In this implementation manner, the first optical path length of the camera module is small, which can meet the requirement of a smaller thickness of the camera module.

In a sixth possible implementation, the mechanical back focus of the camera module is greater than or equal to 0.65 mm, and the mechanical back focus is the lens closest to the spherical image sensor in the increasing lens group toward the The maximum distance between the surface of the spherical image sensor and the surface on which the photosensitive device is disposed.

In the implementation manner, the mechanical back focus of the camera module is greater than 0.65 mm, and the remaining space available for design is large, and the flexibility is high.

In a seventh possible implementation, the camera module further includes a fixing block and a circuit board, the fixing block includes a first fixing surface and a second fixing surface, and the circuit board includes a first circuit board surface;

The spherical image sensor further includes a back spherical surface opposite to the surface on which the photosensitive device is disposed, and the back spherical surface is attached to the first fixed surface;

The second fixing surface is attached to the surface of the first circuit board.

In an eighth possible implementation manner, the circuit board further includes a second circuit board surface opposite to the first circuit board surface, the thickness of the camera module refers to the second circuit board surface and the a distance between end faces of the first end of the first barrel, the first end being an end of the first barrel opposite the spherical image sensor, the thickness being less than or equal to 6.5 mm.

In a ninth possible implementation manner, the camera module further includes a filter;

The filter is disposed between the spherical lens and the spherical image sensor, the spherical lens is isolated from the filter, and the filter is isolated from the spherical image sensor;

The filter is perpendicular to a line of the optical axis of the spherical lens, the projection of the spherical lens in the first plane and the projection of the spherical image sensor in the first plane both fall on the filter a range of projections of the light sheet in the first plane, the first plane being a plane perpendicular to a line of the optical axis of the spherical lens;

The filter is configured to transmit an optical signal having a wavelength within a specified range, the specified range including a first specified range and a second specified range, the first specified range being greater than or equal to 400 nanometers and less than or equal to 700 nanometers The second specified range is a range greater than or equal to 800 nanometers and less than or equal to 900 nanometers.

In this implementation mode, by setting a filter and an infrared light emitting diode IR led, the camera module can ensure iris recognition and expand the function of the camera module.

In a tenth possible implementation, the camera module further includes a spacer between the spherical lens and the spherical image sensor, the spherical lens is isolated from the spacer, and The spacer is isolated from the spherical image sensor, the spacer being perpendicular to a line along which the optical axis of the spherical lens is located;

The spacer includes an inner hole, and the amount of light refracted to the surface on which the photosensitive device is disposed can be adjusted by adjusting the size of the inner hole, and the projection of the spacer in the second plane falls on the spherical lens In the range of the projection on the second plane, the second plane refers to a plane perpendicular to the line in which the optical axis is located.

In an eleventh possible implementation manner, the camera module further includes an IR light emitting diode (IR led);

The IR LED is configured to emit a specified optical signal, and the wavelength of the specified optical signal is in the second specified range. After the specified optical signal is reflected by the iris of the human eye, the obtained optical signal passes through the spherical lens. Refractive to the filter, and filtered by the filter, and transmitted to the surface on which the photosensitive device is disposed, the surface of the photosensitive device being configured to generate the iris based on the received light signal image.

In a twelfth possible implementation, the camera module further includes a wide-angle lens, a planar image sensor, and a second lens barrel, wherein the second lens barrel has a second through hole, and the wide-angle lens is located in the a two-pass hole, the planar image sensor is located outside the second lens barrel, and an optical axis of the wide-angle lens, a central axis of the planar image sensor, and a central axis of the second through hole are all on the same line on.

The wide-angle lens includes a first wide-angle lens mirror and a second wide-angle lens mirror. The first wide-angle lens mirror surface is a convex spherical surface, and a convex direction of the first wide-angle lens mirror faces away from the second wide-angle lens mirror surface, and the second wide-angle lens mirror surface is a plane or a convex spherical surface, in the second In the case where the wide-angle lens mirror is a convex spherical surface, the convex direction of the second wide-angle lens mirror faces away from the first wide-angle lens mirror.

The first wide-angle lens mirror is for receiving an optical signal reflected by each object point in the object surface, and the second wide-angle lens mirror is for refracting the optical signal to a surface of the planar image sensor configured with the photosensitive device, The planar image sensor is configured with a surface of the photosensitive device for generating an image of the object plane based on the received light signal.

In the present embodiment, by providing a wide-angle lens and a planar image sensor, it is possible to increase the angle of view of the image and adjust the size of the captured image.

DRAWINGS

1 is a schematic structural diagram of a camera module provided by a related art;

2 is a schematic diagram of focusing by using a camera module provided by the related art;

FIG. 3 is a schematic diagram of focusing by using a camera module provided by the related art; FIG.

4 is a schematic structural diagram of a camera module according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of focusing by using a camera module provided by an embodiment of the present disclosure; FIG.

FIG. 6 is a schematic structural diagram of a camera module according to an embodiment of the present disclosure;

7 is a schematic structural diagram of a camera module according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of focusing by using a camera module provided by an embodiment of the present disclosure; FIG.

FIG. 9 is a schematic structural diagram of a camera module according to an embodiment of the present disclosure;

FIG. 10 is a schematic structural diagram of a camera module according to an embodiment of the present disclosure;

11 is a schematic structural diagram of a camera module according to an embodiment of the present disclosure;

FIG. 12 is a schematic structural diagram of a camera module according to an embodiment of the present disclosure;

FIG. 13 is a schematic structural diagram of a camera module according to an embodiment of the present disclosure;

FIG. 14 is a schematic diagram of performing iris recognition by using a camera module provided by an embodiment of the present disclosure;

FIG. 15 is a schematic structural diagram of a camera module according to an embodiment of the present disclosure;

16 is a schematic structural diagram of a camera module according to an embodiment of the present disclosure;

FIG. 17 is a schematic structural diagram of a camera module according to an embodiment of the present disclosure.

detailed description

The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

FIG. 4 is a schematic structural diagram of a camera module according to an embodiment of the present disclosure. Referring to FIG. 4 , the camera module includes a spherical lens 201 and a spherical image sensor 202 .

The spherical lens 201 includes a first mirror surface 2011 and a second mirror surface 2012. The first mirror surface 2011 is a convex spherical surface, and the convex direction of the first mirror surface 2011 is away from the second mirror surface 2012. The second mirror surface 2012 is a plane or The convex spherical surface (FIG. 4 is only a plane), and in the case where the second mirror surface 2012 is a convex spherical surface, the protruding direction of the second mirror surface 2012 is away from the first mirror surface 2011. Wherein, the convex spherical surface refers to a spherical surface whose outer surface is a reflecting surface, and the spherical surface refers to a curved surface having an equal curvature radius.

In addition, the spherical lens 201 may be a positive focal length lens, and the positive focal length lens may form a real image when the object surface is photographed, the real image and the object surface are on both sides of the positive focal length lens, or the spherical lens 201 may be a negative focal length lens. The negative focal length lens can form a virtual image when the object surface is photographed, and the virtual image and the object plane are on the same side of the negative focal length lens.

As shown in FIG. 4, the surface 2021 of the spherical image sensor 202 in which the photosensitive device is disposed is a concave spherical surface, and the opening of the concave spherical surface faces the second mirror surface 2012, the optical axis of the spherical lens 201 and the surface on which the photosensitive device is disposed. The central axes of the 2021 are on the same line.

In the process of capturing a certain object by the camera module, the surface of the object facing the first mirror surface 2011 is the object surface, and the point in the object surface is the object point. The first mirror surface 2011 is configured to receive an optical signal reflected by each object point on the object surface of the object to be photographed, and the second mirror surface 2012 is configured to refract the light signal to the surface 2021 on which the photosensitive device is disposed. The surface 2021 of the photosensitive device is configured to generate an image surface corresponding to the object surface based on the light signal.

The image plane is an image obtained by capturing the object by using the camera module; or the image plane is an image obtained by capturing the object surface of the object by using the camera module, and the image plane is formed in the configuration. On the surface 2021 of the device, the image plane is also a concave spherical surface, and the curvature of the image plane is equal to the curvature of the surface on which the photosensitive member is disposed.

The object to be photographed refers to a target photographed by the camera module, and may be a human, a plant or an animal. The photosensitive device may be a charge coupled device (CCD) or a metal oxide semiconductor device (Complementary Metal-Oxide). Semiconductor, CMOS), etc.

Wherein, since the curvature of the image plane is equal to the curvature of the surface 2021 on which the photosensitive device is disposed, the image plane is formed on the surface on which the photosensitive device is disposed, and the image is generated according to the image plane, and the first mirror surface 2011 can be corrected. The aberration caused by the shooting.

Referring to FIG. 5, for the object point A, the object point B, and the object point C which are different from each other and the distance from the optical axis, the object point A corresponds to the focus point A3, and the object point B corresponds to the focus point B3. The object point C corresponds to the focus C3, and the image plane composed of the focus A3, the focus B3, and the focus C3 is equal to the curvature of the surface 2021 on which the photosensitive member is disposed. Then, when focusing on the object point A, the focus A3 falls on the surface 2021 on which the photosensitive device is disposed, the focus B3 and the focus C3 also fall on the surface 2021 on which the photosensitive device is disposed, and similarly, when aiming at the object point B When the focus B3 falls on the surface 2021 on which the photosensitive device is disposed, the focus A3 and the focus C3 also fall on the surface 2021 on which the photosensitive device is disposed, that is, which object point is focused on the object surface. As long as the focus corresponding to any object point falls on the surface 2021 on which the photosensitive device is disposed, the corresponding focus of all the object points will fall on the surface 2021 on which the photosensitive device is disposed, ensuring that each point of the generated image is clear and corrected. Aberration.

In the process of setting the spherical image sensor 202, a reference object surface may be disposed at a specified position from the spherical lens 201, and the reference object surface may be simulated by the spherical lens 201 to obtain a reference image surface corresponding to the reference object surface. The reference image plane is a surface composed of respective focal points corresponding to respective object points in the reference object plane, and the curvature of the reference image plane is determined, and the curvature of the surface 2021 on which the photosensitive device is disposed is set as the curvature of the reference image plane, thereby determining The arrangement is configured to have the shape of the surface 2021 of the photosensitive device. The designated position may be a position that is opposite to the transmission direction of the optical signal and the distance from the spherical lens 201 is a preset distance, and the preset distance may be determined according to the setting requirement.

Specifically, the curvature of the reference image plane can be determined by a preset simulation algorithm, which can implement the function of the analog photographing, and can acquire the curvature of the image plane corresponding to the object surface for the determined object plane. Then, when performing the simulation, the surface shape of the spherical lens 201, the refractive index of each point on the first mirror surface 2011 and the second mirror surface 2012, and the minimum thickness and the maximum thickness of the spherical lens 201 can be obtained, and the reference object surface is obtained. The distance between the specified position and the spherical lens 201 is input, and the parameter and the distance are input to a preset simulation algorithm capable of outputting the curvature of the reference image plane.

When the camera module captures the object surface, the minimum distance between the object surface and the first mirror surface 2011 is far greater than the maximum between the spherical lens 201 and the surface 2021 where the photosensitive device is disposed, regardless of the position of the object surface. The distance can be considered to be located at the infinity of the spherical lens 201, and the size of the object surface is also much larger than the size of the spherical lens 201 and the size of the surface 2021 on which the photosensitive device is disposed, so that it can be considered that for the camera module The difference between the position and size of the object surface is negligible. It can be considered that when the camera module shoots each object surface, the obtained image surface is similar to the reference image surface, then the surface 2021 of the photosensitive device will be disposed. The curvature is set equal to the curvature of the reference image plane, so that the curvature of the surface 2021 of the photosensitive device is not much different from the curvature of the image surface corresponding to any object surface, and any object surface can be photographed. Correct aberrations to ensure clear images.

In the camera module provided in this embodiment, since the curvature of the surface of the photosensitive device is equal to the curvature of the image surface corresponding to the object surface, the image point corresponding to each object point of the object surface is corresponding to each object point. The focus can be placed on the surface of the photosensor, ensuring that the images generated by each object point are clear, correcting the aberration, and improving the imaging effect of the camera module.

Alternatively, since the optical signal passes through the lens, a certain degree of loss is caused. In this embodiment, the lens for correcting the aberration is not required, and the loss to the optical signal can be reduced, and the transmission to the surface 2021 where the photosensitive device is disposed is increased. The amount of light passing through ensures a clearer image.

In another embodiment, for the surface of the spherical image sensor 202 other than the surface 2021 of the photosensitive device, see FIG. 6, the spherical image sensor 202 further includes an upper surface 2022, a lower surface 2023, and a photosensitive surface. The surface 2021 of the device is opposite the back spherical surface 2024.

The upper side surface 2022 and the lower side surface 2023 are respectively parallel to a central axis of the surface 2021 on which the photosensitive member is disposed, and the curvature of the back spherical surface 2024 is equal to the curvature of the surface 2021 on which the photosensitive member is disposed.

FIG. 7 is a schematic structural diagram of a camera module according to an embodiment of the present disclosure. On the basis of the foregoing embodiment, referring to FIG. 7, the camera module further includes: a telephoto lens group 203, where the telephoto lens group 203 is located. The spherical lens 201 and the spherical image sensor 202 are separated from the spherical lens 201 and the spherical image sensor 202, respectively.

The adder lens group 203 includes at least one lens (only one lens is taken as an example), and an optical axis of each of the at least one lens is in line with an optical axis of the spherical lens 201, and the distance lens is The group 203 is for increasing the focal length of the camera module, and is also capable of correcting image distortion caused when the spherical lens 201 is photographed on the object surface.

Since the focal length of the camera module is determined according to the focal length of the spherical lens 201, the focal length of the increasing lens group 203, and the maximum distance between the spherical lens 201 and the increasing lens group 203, it is determined by a preset simulation algorithm. In practical applications, the ideal focal length of the camera module can be determined according to the requirements of the camera module, and the focal length of the spherical lens 201 can be determined. According to the ideal focal length and the focal length of the spherical lens 201, the distance increasing lens is calculated according to a preset simulation algorithm. The theoretical maximum distance between the group 203 and the spherical lens 201 and the theoretical focal length of the increasing lens group 203, and the increasing distance lens group 203 matching the theoretical maximum distance and the theoretical focal length are set, thereby ensuring that the focal length of the camera module is an ideal focal length.

Further, the adder lens group 203 may include a plurality of lenses, and the curvature of each of the plurality of lenses toward the mirror surface of the spherical lens 201 is different from the curvature of each of the lenses toward the mirror surface of the spherical lens 201.

Wherein, for any lens in the adder lens group 203, the lens may include a first increasing lens surface and a second increasing lens surface, and the first increasing lens surface 2031 is closer to the second mirror 2012, and the second increasing The surface 2021 on which the photosensitive device is disposed is closer to the lens mirror 2032. The first increasing lens surface of any lens may be a plane or a curved surface; in the case where the first increasing lens surface is a curved surface, the first increasing lens surface may be convex or concave; further, in the first increasing lens In the case where the mirror surface is convex, the first increasing lens surface may be a spherical surface. Similarly, the second increasing lens surface of any lens may also be a plane or a curved surface. In the case where the second increasing lens surface is curved, the second increasing lens surface may be convex or concave; further, in the In the case where the mirror of the second increasing lens is convex, the mirror of the second increasing lens may be a spherical surface. And any of the lenses may be either a positive focal length lens or a negative focal length lens. The plurality of lenses in the adder lens group can be of different types.

It should be noted that, for the camera module including the adder lens group 203 and the camera module not including the adder lens group 203, the curvature of the reference image plane formed by the two is different for the camera mode including the adder lens group 203. In the group, the reference object plane is simulated by both the spherical lens 201 and the adder lens group 203 to obtain a reference image plane, and the curvature of the surface 2021 on which the photosensitive device is disposed is set as the curvature of the reference image plane. Then, referring to Fig. 8, when focusing is performed, it is also ensured that the image plane is formed on the surface 2021 on which the photosensitive member is disposed.

Wherein, a surface shape of the spherical lens 201, a refractive index of each point on the first mirror surface 2011 and the second mirror surface 2012, and a minimum thickness and a maximum thickness of the spherical lens 201 may be acquired; and each lens in the lens group 203 is increased. a surface shape, a refractive index of each point of the first increasing lens surface and the second increasing lens surface, and a minimum thickness and a maximum thickness of each lens; a distance between the spherical lens 201 and the increasing lens group 203; Increasing the distance between each adjacent lens in the lens group 203; and acquiring the minimum distance between the specified position where the reference object is located and the spherical lens 201, and inputting these parameters and the distances into a preset simulation algorithm, The preset simulation algorithm is capable of outputting the curvature of the reference image plane.

In a possible implementation manner, referring to FIG. 9, the camera module may further include a first lens barrel 204 having a first through hole therein, the spherical lens 201 and the distance increasing lens group 203 being located. The first through hole, the spherical image sensor is located outside the first lens barrel 204, and an optical axis of the spherical lens 201, a central axis of the surface 2021 where the photosensitive device is disposed, and each of the distance increasing lens groups 203 The optical axis of the lens and the central axis of the first through hole are all on the same straight line.

The inner diameter of the first through hole is less than or equal to 5 mm, and the inner diameter of the first through hole is larger than a larger value of the height value of the spherical lens 201 and the height value of the distance increasing lens group 203, and the height of the spherical lens 201 The direction and the height direction of the camera module are both perpendicular to the linear direction of the optical axis of the spherical lens 201.

The first lens barrel 204 is configured to protect the spherical lens 201 and the distance increasing lens group 203, and prevent the spherical lens 201 and the distance increasing lens group 203 from being subjected to dust. The light signal reflected by the object surface is along the first lens barrel. The first through hole of the 204 can be transmitted to the spherical lens 201, and the optical signal refracted by the adder lens group 203 can be transmitted to the spherical image sensor 202.

The first point to be explained is that the larger the focal length of the camera module, the farther the distance of the object surface that can be photographed. For the camera module provided by the present disclosure, the spherical lens 201 and the widening lens group 203 can be equivalent to one virtual lens, and the distance between the focus of the virtual lens and the center of the virtual lens is defined as the first equivalent. a focal length, the first equivalent focal length may be determined according to a focal length of the spherical lens 201, a focal length of the increasing lens group 203, a distance between the spherical lens 201 and the increasing lens group 203, based on a preset simulation algorithm, the first The equivalent focal length may be greater than or equal to 20% of the radius of curvature of the surface 2021 on which the photosensitive device is disposed, thereby satisfying the user's need to photograph a distant object surface.

The second point to be explained is that the smaller the optical path length of the camera module, the smaller the thickness. For the camera module provided by the present disclosure, the maximum distance between the surface 2021 configured with the photosensitive device and the first mirror surface 2011 may be defined as a first optical path length, and the ratio between the first equivalent focal length and the first optical path length Greater than or equal to 1.5, because the first optical path length is small, it can meet the requirement of smaller thickness of the camera module.

The third point that needs to be explained is that the larger the mechanical back focus of the camera module, the larger the remaining space available for design, and the higher the flexibility. For the camera module provided in this embodiment, the mechanical back focus is the increased distance. The lens closest to the spherical image sensor 202 in the lens group 203 faces the maximum distance between the surface of the spherical image sensor 202 and the surface 2021 on which the photosensitive member is disposed. The mechanical back focus is greater than 0.65 mm and the flexibility is high.

On the basis of the above three points, the first equivalent focal length of the camera module provided in this embodiment may be 7.76 mm, and the first optical path length may be 4.15 mm.

In this embodiment, it is not necessary to provide any lens for correcting aberrations, and the aberration can be corrected only by the spherical image sensor, which can save a great space. A telephoto lens group is added to the space saved, and the effect of increasing the focal length can be achieved.

FIG. 10 is a schematic structural diagram of a camera module according to an embodiment of the present disclosure. The camera module further includes a fixed block 205 and a circuit board 206.

The fixing block 205 is used to fix the spherical image sensor 202, and the spherical image sensor 202 includes a back spherical surface 2024 opposite to the surface 2021 on which the photosensitive device is disposed. The fixed block includes a first fixing surface 2051 and a second fixing surface 2052. The curvature of a fixed surface 2051 is equal to the curvature of the back spherical surface 2024, and the back spherical surface 2024 is attached to the first fixing surface 2051. The bonding manner may be glue bonding or bonding of other materials.

The circuit board 206 includes a first circuit board surface 2061 and a second circuit board surface 2062. The second fixing surface 2052 is attached to the first circuit board surface 2061. The bonding manner can also be glue bonding or other materials. Bonding.

For the camera module provided in this embodiment, the distance between the end surface of the first end 2041 of the first lens barrel 204 and the surface 2062 of the second circuit board may be defined as the thickness of the camera module, and the first end refers to the first end. One end of the lens barrel 204 is away from the end of the spherical image sensor 202, and the thickness is less than or equal to 6.5 mm.

FIG. 11 is a schematic structural diagram of a camera module according to an embodiment of the present disclosure. The camera module further includes a filter 207 on the basis of the foregoing embodiment.

The filter 207 is disposed between the spherical lens 201 and the spherical image sensor 202, and the spherical lens 201 is isolated from the filter 207, and the filter 207 is isolated from the spherical image sensor 202.

The filter 207 is perpendicular to a line of the optical axis of the spherical lens 201. The projection of the spherical lens 201 in the first plane and the projection of the spherical image sensor 202 in the first plane both fall on the filter. 207 is within a range of projections in the first plane, the first plane being a plane perpendicular to a line of the optical axis of the spherical lens 201;

The filter 207 is capable of transmitting a wavelength within a specified range. That is, when an optical signal having a wavelength within the specified range is transmitted to the filter 207, it can be transmitted from the filter 207, and when an optical signal whose wavelength is not within the specified range is transmitted to the filter 207, It cannot be transmitted from the filter 207.

The specified range includes a first specified range and a second specified range, the first specified range being greater than or equal to 400 nanometers and less than or equal to 700 nanometers, being a wavelength range of visible light signals, the second specified range being greater than or equal to The range of 800 nm and less than or equal to 900 nm is the wavelength range of the infrared light signal.

Then, when the visible light signal is reflected by the object surface, the visible light signal can be transmitted from the filter 207 and transmitted to the surface 2021 on which the photosensitive device is disposed, and the surface 2021 on which the photosensitive device is disposed can generate the object surface under the irradiation of the visible light signal. image. Similarly, when the object surface reflects the infrared light signal, the infrared light signal can be transmitted from the filter 207 and transmitted to the surface 2021 on which the photosensitive device is disposed, and the surface 2021 on which the photosensitive device is disposed can generate the object surface in the infrared light. The image under the signal. In addition, when the object surface reflects other optical signals than the visible light signal and the infrared light signal, the other light signals cannot be transmitted from the filter 207, and cannot be transmitted to the surface 2021 on which the photosensitive device is disposed, thereby avoiding other light. The signal interferes with the surface 2021 of the photosensor.

FIG. 12 is a schematic structural diagram of a camera module according to an embodiment of the present disclosure. On the basis of the embodiment shown in FIG. 4, referring to FIG. 12, the camera module further includes a spacer 208 between the spherical lens 201 and the spherical image sensor 202, the spherical lens 201 and the pad. The sheet 208 is isolated and the spacer 208 is isolated from the spherical image sensor 202, which is perpendicular to the line of the optical axis of the spherical lens 201.

The spacer 208 includes an inner hole, and the amount of light refracted to the surface 2021 of the photosensitive device can be adjusted by adjusting the size of the inner hole, and the projection of the spacer 208 in the second plane falls on the spherical lens 201. In the range of the projection on the second plane, the second plane refers to a plane perpendicular to the line in which the optical axis is located.

Specifically, the radius of the inner hole can be adjusted according to the requirement of the degree of brightness of the generated image, and the aperture of the camera module can be controlled, that is, the amount of light transmitted to the surface 2021 on which the photosensitive device is disposed can be controlled. For example, when a brighter image is to be generated, the radius of the inner hole can be increased, the aperture of the camera module can be increased, and the amount of light transmitted to the surface 2021 on which the photosensitive device is disposed can be increased. Similarly, when a darker image is to be generated, the radius of the inner hole can be reduced, the aperture of the camera module can be reduced, and the amount of light refracted onto the surface 2021 on which the photosensitive device is disposed can be reduced.

In another embodiment, referring to FIG. 13, the camera module further includes an IR led 209, and the camera module can perform iris recognition by setting an IR led 209.

Specifically, referring to FIG. 14, the IR led 209 is configured to transmit a designated optical signal, and the wavelength of the designated optical signal is in the second specified range, which is an infrared optical signal. When the specified light signal is irradiated to the iris of the human eye and reflected by the iris of the human eye, the obtained optical signal passes through the spherical lens 201, is refracted to the filter 207, filtered by the filter 207, and transmitted to the iris 207. On the surface 2021 of the photosensitive device, the surface 2021 of the photosensitive device is configured to generate an image of the iris based on the received light signal.

The spherical image sensor 202 can be 1/3 inch in size, the number of pixels can be 12 million, the first equivalent focal length can be 15 mm, and the first optical path length can be 5 mm. The iris recognition of the camera module The distance is 80 cm, and the iris recognition distance is used to specify the maximum distance between the iris and the spherical lens 201 when the image of the iris is generated. Then, as long as the distance between the iris and the spherical lens 201 is less than 80 cm, the surface 2021 of the photosensitive device is disposed to generate an image of the iris. The size of the spherical image sensor 202 means that the spherical image sensor 202 is flattened along the curved direction of the surface 2021 on which the photosensitive device is disposed, so that the surface 2021 on which the photosensitive device is disposed becomes a plane, the plane is diagonal length.

In another embodiment, referring to FIG. 15, the present disclosure further provides a camera system including the camera module shown in FIG. 4 and an IR led 209 disposed outside the camera module, the IR led 209 and the camera module. Isolated.

16 is a schematic structural diagram of a camera module according to an embodiment of the present disclosure. On the basis of the embodiment shown in FIG. 4, referring to FIG. 16, the camera module further includes a wide-angle lens 211, a planar image sensor 212, and a second lens barrel 213 having a second through hole therein, the wide-angle lens 211 is located at the second through hole, the planar image sensor 212 is located outside the second lens barrel 213, and the wide-angle lens 211 The optical axis, the central axis of the planar image sensor 212, and the central axis of the second through hole are all on the same straight line.

The wide-angle lens 211 includes a first wide-angle lens mirror 2111 and a second wide-angle lens mirror 2112. The first wide-angle lens surface 2111 is a convex spherical surface, and the convex direction of the first wide-angle lens surface 2111 is away from the second wide-angle lens surface 2112. The second wide-angle lens surface 2112 is a plane or a convex spherical surface. In the case where the wide-angle lens mirror 2112 is a convex spherical surface, the convex direction of the second wide-angle lens mirror 2112 is away from the first wide-angle lens mirror 2111.

The first wide-angle lens mirror 2111 is configured to receive an optical signal reflected by each object point in the object plane, and the second wide-angle lens mirror 2112 is configured to refract the optical signal to the surface 2121 of the planar image sensor 212 configured with the photosensitive device, the configuration A surface 2121 having a photosensitive device is used to generate an image of the object plane based on the received light signal.

The planar image sensor 212 and the spherical image sensor 202 can be fixed on the circuit board 206, and the electrical connection is realized through the circuit board 206. The number of pixels of the spherical image sensor 202 and the planar image sensor 212 may each be 12 million. The size of the spherical image sensor 202 and the size of the planar image sensor 212 may both be 1/2.86 inches, although other sizes may be used, and the size of the spherical image sensor 202 may be slightly smaller than the size of the planar image sensor 212. The size of 212 refers to the length of the diagonal of the surface 2121 on which the photosensitive device is disposed.

In the embodiment, the wide-angle lens 211 and the planar image sensor 212 are also provided. The change of the structure causes the camera module provided in this embodiment to be different from the camera module of the embodiment shown in FIG. Optionally, the first optical path length of the camera module is 5 mm, the first equivalent focal length is 15 mm, the second optical path length is 4.15 mm, and the second equivalent focal length is 3.86 mm. The second optical path length is long. For the maximum distance between the surface 2121 of the photosensitive device and the first wide-angle lens mirror 2111, the second equivalent focal length is the focal length of the wide-angle lens 211, and the second equivalent focal length is smaller than the first equivalent focal length.

In the camera module provided in this embodiment, the wide-angle lens 211 and the spherical lens 201 are combined to jointly capture a target object, and the angle of view of the image can be increased with respect to the single object captured by the spherical lens 201.

Specifically, the smaller the focal length of the lens, the larger the angle of view of the photographing and the smaller the farthest distance that can be photographed. Similarly, the larger the focal length of the lens, the smaller the angle of view of the shot and the greater the distance that can be captured. Referring to FIG. 17, the first equivalent focal length of the camera module is large, and the farthest distance a that can be captured is large and the angle of view x is small. The second equivalent focal length of the wide-angle lens 211 is small, and the farthest distance b that can be photographed is small and the angle of view y is large. In the process of capturing the target object, the target object having a large distance and a small viewing angle can be imaged by the spherical lens 201 to generate a first image, and the target object having a small distance and a large angle of view can be imaged by the wide-angle lens 211 to generate a second image, which will be first. The image and the second image are combined into a third image, and the third image includes both a target having a large viewing angle and a target having a large distance.

Also, the size of the captured image can be adjusted. In a first possible implementation, the camera module can adjust the size of the captured image by optical zoom, which refers to the manner in which the size of the image is adjusted by changing the focal length. The camera module can adjust the first equivalent focal length of the spherical lens 201 by adjusting the distance between the spherical lens 201 and the spherical image sensor 202, and can adjust the wide-angle lens by adjusting the distance between the wide-angle lens 211 and the planar image sensor 212. The second equivalent focal length of 211. By adjusting the first equivalent focal length and the second equivalent focal length, optical zoom can be achieved to adjust the size of the image. During optical zooming, the resolution of the image is always the same.

The multiple of the optical zoom is a magnification when the size of the image is adjusted by changing the focal length, and the multiple of the optical zoom is equal to the ratio between the first equivalent focal length and the second equivalent focal length of the camera module. The multiples of the optical zoom of the camera module provided in this embodiment may be greater than 1 time and less than or equal to 3.88 times. Then, the image may be enlarged by 3.88 times under the premise of ensuring that the resolution of the image remains unchanged.

In a second possible implementation manner, the camera module can adjust the size of the captured image by using a digital zoom, where the image size is adjusted by an image processing algorithm, and the camera module can store the image. The processing algorithm processes the generated image through an image processing algorithm to realize digital zoom, thereby adjusting the size of the image. In the process of digital zoom, the resolution of the image changes. The larger the multiple of the digital zoom, the lower the resolution of the image.

The multiple of the digital zoom is a magnification when the size of the image is adjusted by an image processing algorithm. The multiple of the digital zoom of the camera module provided in this embodiment may be greater than 1 time and less than or equal to 14.9 times, that is, the image may be enlarged by up to 14.9 times without requiring resolution.

All of the above optional technical solutions may be combined to form an optional embodiment of the present disclosure, and will not be further described herein.

A person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by hardware, or may be instructed by a program to execute related hardware, and the program may be stored in a computer readable storage medium. The storage medium mentioned may be a read only memory, a magnetic disk or an optical disk or the like.

The above description is only an alternative embodiment of the present disclosure, and is not intended to limit the disclosure, and any modifications, equivalents, improvements, etc., made within the spirit and principles of the present disclosure should be included in the protection of the present disclosure. Within the scope.

Claims

A camera module, wherein the camera module comprises: a spherical lens and a spherical image sensor;

The spherical lens includes a first mirror surface and a second mirror surface, the first mirror surface is a convex spherical surface, and a convex direction of the first mirror surface is away from the second mirror surface, and the second mirror surface is a plane or a convex surface a spherical surface, in a case where the second mirror surface is a convex spherical surface, a convex direction of the second mirror surface is away from the first mirror surface;

a surface of the spherical image sensor in which the photosensitive device is disposed is a concave spherical surface, and an opening of the concave spherical surface faces the second mirror surface, and an optical axis of the spherical lens and a central axis of the surface on which the photosensitive device is disposed are in the same Straight line

The first mirror surface is for receiving an optical signal reflected by each object point on the object surface of the object to be photographed, and the second mirror surface is for refracting the light signal to the surface on which the photosensitive device is disposed, The object surface refers to a surface of the object facing the first mirror surface, and a point in the object plane is an object point;

The surface of the photosensitive device is configured to generate an image surface corresponding to the object surface according to the light signal, and the image surface is formed on the surface on which the photosensitive device is disposed, and the image surface is also A concave spherical surface, and the curvature of the image surface is equal to the curvature of the surface on which the photosensitive device is disposed.
The camera module according to claim 1, wherein the camera module further comprises: a telephoto lens group, the telephoto lens group being located between the spherical lens and the spherical image sensor, and The adder lens group is isolated from the spherical lens and the spherical image sensor, respectively, the distance increasing lens group includes at least one lens, and an optical axis of each of the at least one lens and a light of the spherical lens The axes are in a straight line;

The adder lens group is used to increase the focal length of the camera module.
The camera module according to claim 2, wherein the adder lens group comprises a plurality of lenses, and a curvature of a mirror surface of each of the plurality of lenses toward the spherical lens is different from each other The lens faces the curvature of the mirror surface of the spherical lens.
The camera module according to claim 2 or 3, wherein the camera module further comprises a first lens barrel, the first lens barrel has a first through hole, the spherical lens and the increase The lens group is located at the first through hole, the spherical image sensor is located outside the first lens barrel, and an optical axis of the spherical lens, a central axis of the surface on which the photosensitive device is disposed, and the increase The optical axis of each lens in the lens group and the central axis of the first through hole are all on the same straight line;

The inner diameter of the first through hole is less than or equal to 5 mm, and an inner diameter of the first through hole is larger than a larger value of a height value of the spherical lens and a height value of the distance increasing lens group, the spherical surface The height direction of the lens and the height direction of the camera module are both perpendicular to the linear direction in which the optical axis of the spherical lens is located.
The camera module according to any one of claims 2 to 4, wherein the first equivalent focal length of the camera module is greater than or equal to 20% of a radius of curvature of the surface on which the photosensitive device is disposed, The first equivalent focal length refers to a distance between a focal point of the virtual lens and a center of the virtual lens when the spherical lens and the adder lens group are equivalent to one virtual lens, and the first An equivalent focal length is determined according to a focal length of the spherical lens, a focal length of the increasing lens group, and a distance between the spherical lens and the increasing lens group, based on a preset simulation algorithm;

a ratio between the first equivalent focal length and a first optical path length of the camera module is greater than or equal to 1.5, the first optical path length being between the surface on which the photosensitive device is disposed and the first mirror surface The maximum distance.
The camera module according to claim 5, wherein the mechanical back focus of the camera module is greater than or equal to 0.65 mm, and the mechanical back focus is the closest to the spherical image sensor in the extended lens group One lens faces a maximum distance between the surface of the spherical image sensor and the surface on which the photosensitive device is disposed.
The camera module according to any one of claims 1 to 6, wherein the camera module further comprises a fixing block and a circuit board, the fixing block comprises a first fixing surface and a second fixing surface, The circuit board includes a first circuit board surface;

The spherical image sensor further includes a back spherical surface opposite to the surface on which the photosensitive device is disposed, and the back spherical surface is attached to the first fixed surface;

The second fixing surface is attached to the surface of the first circuit board.
The camera module according to claim 7, wherein the circuit board further comprises a second circuit board surface opposite to the surface of the first circuit board, and the thickness of the camera module refers to the second a distance between a surface of the circuit board and an end surface of the first end of the first barrel, the first end being an end of the two ends of the first barrel away from the spherical image sensor, the thickness being less than Or equal to 6.5 mm.
The camera module according to any one of claims 1 to 8, wherein the camera module further comprises a filter;

The filter is disposed between the spherical lens and the spherical image sensor, the spherical lens is isolated from the filter, and the filter is isolated from the spherical image sensor;

The filter is perpendicular to a line of the optical axis of the spherical lens, the projection of the spherical lens in the first plane and the projection of the spherical image sensor in the first plane both fall on the filter a range of projections of the light sheet in the first plane, the first plane being a plane perpendicular to a line of the optical axis of the spherical lens;

The filter is configured to transmit an optical signal having a wavelength within a specified range, the specified range including a first specified range and a second specified range, the first specified range being greater than or equal to 400 nanometers and less than or equal to 700 nanometers The second specified range is a range greater than or equal to 800 nanometers and less than or equal to 900 nanometers.
The camera module according to any one of claims 1 to 9, wherein the camera module further comprises a spacer, the spacer being located between the spherical lens and the spherical image sensor, The spherical lens is isolated from the spacer, and the spacer is isolated from the spherical image sensor, the spacer being perpendicular to a line along which the optical axis of the spherical lens is located;

The spacer includes an inner hole, and the amount of light refracted to the surface on which the photosensitive device is disposed can be adjusted by adjusting the size of the inner hole, and the projection of the spacer in the second plane falls on the spherical lens In the range of the projection on the second plane, the second plane refers to a plane perpendicular to the line in which the optical axis is located.