CN114302048B - Camera modules and electronic equipment - Google Patents

Abstract

The present application discloses a camera module and an electronic device, wherein the camera module comprises: an imaging lens; a first reflector is arranged at one side of the imaging lens, and the first reflector and the imaging lens are arranged at intervals along the optical axis direction of the imaging lens; a light transmission lens group comprises a plurality of second reflectors; light passing through the imaging lens is incident on the reflection surface of the first reflector, and light reflected by the first reflector is incident on the light transmission lens group, and light incident on the light transmission lens group is transmitted through the second reflector in the light transmission lens group and emitted from the second reflector in the light transmission lens group away from the imaging lens; an imaging chip is arranged adjacent to the second reflector in the light transmission lens group away from the imaging lens, and light emitted from the second reflector in the light transmission lens group away from the imaging lens is projected onto the imaging chip. The camera module of the present application can reduce the height in the optical axis direction of the imaging lens, and avoid the problem of aperture reduction and astigmatism caused by reducing the height by cutting the edge of the lens.

Description

Camera modules and electronic equipment

Technical Field

The present application belongs to the field of camera technology, and specifically relates to a camera module and electronic equipment.

Background technique

As mobile devices such as mobile phones become more and more popular in people's lives, consumers have higher and higher requirements for mobile phone photography, and the demand for ultra-telephoto application scenarios is increasing. At present, ultra-telephoto lenses are achieved through periscope lenses. As the requirements for the resolution of periscope lenses become higher and higher, the aperture of the lens becomes larger and larger, resulting in the height of the lens module becoming higher and higher, which is not conducive to the thinness of mobile phones.

Summary of the invention

The purpose of the embodiments of the present application is to provide a camera module and an electronic device to solve the problem that the height of the lens module is high, which is not conducive to the thinness and lightness of mobile phones.

In a first aspect, an embodiment of the present application provides a camera module, including:

Imaging lenses;

A first reflector, wherein the first reflector is disposed on one side of the imaging lens, and the first reflector and the imaging lens are spaced apart from each other along an optical axis direction of the imaging lens;

A light transmission lens group, wherein the light transmission lens group includes a plurality of second reflectors;

An imaging chip, wherein the imaging chip is disposed adjacent to a second reflector in the light transmission lens group far from the imaging lens, and light emitted from the second reflector in the light transmission lens group far from the imaging lens is projected onto the imaging chip;

The light passing through the imaging lens is incident on the reflecting surface of the first reflector, the light reflected by the first reflector is incident on the second reflector in the light transmission lens group close to the imaging lens, and the light incident on the light transmission lens group is transmitted through the second reflector in the light transmission lens group and emitted from the second reflector in the light transmission lens group far away from the imaging lens.

In a second aspect, an embodiment of the present application provides an electronic device, including the camera module described in the above embodiment;

The thickness direction of the electronic device is the same as the optical axis direction of the imaging lens.

In the camera module of the embodiment of the present application, the first reflector and the imaging lens are arranged at intervals along the optical axis direction of the imaging lens, the light transmission lens group includes a plurality of the second reflectors, the light reflected by the first reflector is incident on the second reflector in the light transmission lens group close to the imaging lens, the light incident on the light transmission lens group is transmitted through the second reflector in the light transmission lens group, and is emitted from the second reflector in the light transmission lens group away from the imaging lens, and the light emitted from the second reflector in the light transmission lens group away from the imaging lens is projected onto the imaging chip. By setting the first reflector and the light transmission lens group, the light can be transmitted in a direction perpendicular to the optical axis of the imaging lens, and the height of the camera module in the optical axis direction of the imaging lens can be reduced, which is conducive to the thinning of the camera module and the equipment. No cutting of the lens is required, so as to avoid the problem of smaller aperture and astigmatism caused by reducing the height by cutting the lens, and ensure the aperture effect.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of light transmission of a camera module in an embodiment of the present application;

FIG2 is another light transmission schematic diagram of the camera module in an embodiment of the present application;

FIG3 is a top view of a camera module according to an embodiment of the present application;

FIG4 is a schematic diagram showing the overlap of the imaging lens and the second reflector;

FIG5 is a schematic diagram of the cooperation between the imaging lens and the protrusion structure;

Reference numerals

Imaging lens 10; aspherical lens 11; housing 12; driving mechanism 13;

Light transmission lens group 20;

A first reflector 21; a second reflector 22;

Imaging chip 30;

Filter 40;

Frame 50; rear cover 51; protruding structure 52.

Detailed ways

The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here. In addition, "and/or" in the specification and claims represents at least one of the connected objects, and the character "/" generally represents that the objects associated with each other are in an "or" relationship.

The camera module provided in the embodiment of the present application is described in detail below through specific embodiments and their application scenarios in conjunction with Figures 1 to 5.

As shown in FIGS. 1 to 4 , the camera module of the embodiment of the present application includes: an imaging lens 10, a first reflector 21, an optical transmission lens group 20 and an imaging chip 30, wherein the first reflector 21 is disposed on one side of the imaging lens 10, and the first reflector 21 and the imaging lens 10 are spaced apart along the optical axis direction of the imaging lens 10. The imaging lens 10 may include one or more aspherical lenses, and when the imaging lens 10 includes multiple aspherical lenses, the optical axes of the multiple aspherical lenses may be collinear. The optical transmission lens group 20 may include multiple second reflectors 22, such as three, and the multiple second reflectors 22 may be sequentially arranged in a direction perpendicular to the optical axis of the imaging lens 10, and two adjacent second reflectors 22 may be spaced apart in the optical axis direction of the imaging lens 10. The multiple second reflectors 22 may be sequentially arranged in a direction perpendicular to the optical axis of the imaging lens 10, including two adjacent second reflectors 22 may be spaced apart in a direction perpendicular to the optical axis of the imaging lens 10, and may also include the orthographic projections of two adjacent second reflectors 22 on the first plane partially overlapping, and the first plane is a plane perpendicular to the optical axis of the imaging lens 10. Two adjacent second reflectors 22 may be spaced a certain distance apart in the optical axis direction of the imaging lens 10, and the specific spacing distance may be selected according to actual conditions. The above arrangement of multiple second reflectors 22 allows light to be transmitted in a direction perpendicular to the optical axis of the imaging lens, thereby achieving folding of the light path and reducing the height of the camera module in the optical axis direction of the imaging lens.

The imaging chip 30 can be arranged adjacent to the second reflector 22 in the light transmission lens group far away from the imaging lens 10, and the light emitted from the second reflector 22 in the light transmission lens group far away from the imaging lens 10 is projected onto the imaging chip 30, and an image can be formed on the imaging chip 30. The imaging chip 30 has a photoelectric conversion function, which processes the light passing through the lens and each reflector and finally forms an image. The light passing through the imaging lens 10 is incident on the reflection surface of the first reflector 21, and the light reflected by the first reflector 21 is incident on the second reflector 22 in the light transmission lens group 20 near the imaging lens 10. The light incident on the light transmission lens group 20 is transmitted through the second reflector 22 in the light transmission lens group 20 and is emitted from the second reflector 22 in the light transmission lens group 20 far away from the imaging lens 10. For example, as shown in Figures 1 and 2, the light transmission lens group 20 may include three second reflectors 22, and the three second reflectors 22 may be arranged in sequence along a direction perpendicular to the optical axis of the imaging lens 10, and two adjacent second reflectors 22 may be arranged at intervals in the optical axis direction of the imaging lens 10. The light passing through the imaging lens 10 is incident on the reflecting surface of the first reflector 21, and the light reflected by the first reflector 21 is incident on the second reflector 22 (the second reflector 22 located on the far left) in the light transmission lens group 20 close to the imaging lens 10. The light incident on the light transmission lens group 20 is transmitted through the second reflector 22 (the second reflector 22 located in the middle) in the light transmission lens group 20 and is emitted from the second reflector 22 (the second reflector 22 located on the far right) in the light transmission lens group 20 away from the imaging lens 10. By setting the imaging lens 10, the first reflector 21 and the three second reflectors 22, the light can be transmitted in a direction perpendicular to the optical axis of the imaging lens, so as to realize the folding of the light path and reduce the height of the camera module in the direction of the optical axis of the imaging lens.

In the camera module of the embodiment of the present application, the first reflector 21 and the imaging lens 10 are arranged at intervals along the optical axis direction of the imaging lens 10, and the multiple second reflectors 22 in the light transmission lens group 20 are arranged in sequence along the direction perpendicular to the optical axis of the imaging lens 10. The light reflected by the first reflector 21 is incident on the second reflector 22 in the light transmission lens group 20 close to the imaging lens 10, and the light incident on the light transmission lens group 20 is transmitted through the second reflector 22 in the light transmission lens group 20 and emitted from the second reflector 22 in the light transmission lens group 20 away from the imaging lens 10. By arranging the first reflector 21 and the light transmission lens group 20, the light can be transmitted along the direction perpendicular to the optical axis of the imaging lens 10, and the light emitted from the light transmission lens group 20 can be imaged on the imaging chip 30, which can reduce the height of the camera module in the optical axis direction of the imaging lens, which is conducive to the thinning of the camera module and the equipment. Moreover, multiple second reflectors 22 can be arranged in sequence along a direction perpendicular to the optical axis of the imaging lens 10. They are not restricted by height and do not require edge cutting. The aperture can be increased, avoiding the problem of smaller aperture and astigmatism caused by lowering the height by edge cutting of the lens, thereby ensuring the aperture effect.

In some embodiments, as shown in Figures 1 to 3, the orthographic projections of two adjacent second reflectors 22 on the first plane may partially overlap. The first plane is a plane perpendicular to the optical axis of the imaging lens 10, which facilitates the transmission of light and can reduce the space occupied by the second reflector 22 in the direction perpendicular to the optical axis of the imaging lens 10, which is conducive to the miniaturization of the module.

In other embodiments, as shown in FIGS. 1 to 4 , a portion of the second reflector 22 close to the imaging lens 10 is located between the first reflector 21 and the imaging lens 10, and a portion of the second reflector 22 located between the first reflector 21 and the imaging lens 10 can transmit and reflect light, so that the light passing through the imaging lens 10 can be transmitted from the portion of the second reflector 22 located between the first reflector 21 and the imaging lens 10, and the light transmitted from the portion of the second reflector 22 located between the first reflector 21 and the imaging lens 10 can be projected onto the first reflector 21, and the first reflector 21 can reflect the light projected onto the reflective surface of the first reflector 21. The light reflected by the first reflector 21 can be projected onto the second reflector 22 (the second reflector 22 located on the far left) in the light transmission lens group 20 that is close to the imaging lens 10. The light incident on the light transmission lens group 20 passes through the second reflector 22 (the second reflector 22 located in the middle) in the light transmission lens group 20 for light transmission and is emitted from the second reflector 22 (the second reflector 22 located on the far right) in the light transmission lens group 20 that is far away from the imaging lens 10. The light reflected by the second reflector 22 in the light transmission lens group 20 that is far away from the imaging lens 10 can be projected onto the imaging chip 30 and can be imaged on the imaging chip 30.

In an embodiment of the present application, the transmittance of the portion of the second reflector 22 located between the first reflector 21 and the imaging lens 10 can be 30%-70%, for example, 50%; the reflectivity of the portion of the second reflector 22 located between the first reflector 21 and the imaging lens 10 can be 30%-70%, for example, 50%, so that the portion of the second reflector 22 located between the first reflector 21 and the imaging lens 10 can be a semi-transparent and semi-reflective film, which can facilitate the transmission of light through the imaging lens 10 and reflect the light reflected to this portion by the first reflector 21, so that the light can be transmitted in the light transmission lens.

Optionally, the reflection surface of the first reflector 21 can be total reflection, the reflection surface of the portion of the second reflector 22 located at the periphery of the imaging lens 10 in the light transmission lens close to the imaging lens 10 can be total reflection, and the reflection surface of the second reflector in the light transmission lens far from the imaging lens 10 can be total reflection. The emission of the second reflector 22 located in the middle and the second reflector 22 located on the far right can be total reflection, which improves the reflectivity of the light and reduces the loss during the light transmission process.

The first reflector 21 may have a smooth reflective mirror surface and may be formed by a glass lens coated with a metal total reflective film, which fully reflects the light corrected by the imaging lens 10 and folds the light path. The second reflector 22 in the optical transmission lens close to the imaging lens 10 may be composed of two parts, as shown in FIG4 and FIG5 , the part blocked by the imaging lens 10 group is coated with a semi-transparent and semi-reflective film (50% transmission and 50% reflection are achieved through a dielectric film), and the unblocked part is coated with a metal reflective film to achieve transmission of the light passing through the imaging lens 10 and reflection of the light reflected by the first reflector 21.

Optionally, two adjacent second reflectors 22 can be arranged in parallel and spaced apart in the optical axis direction of the imaging lens 10, and the specific spacing distance can be selected according to actual conditions. The spacing distance between two adjacent second reflectors 22 in the optical axis direction of the imaging lens 10 can be adjusted as needed to facilitate the transmission of light and reduce the height of the camera module in the optical axis direction of the imaging lens. The second reflector 22 can be parallel to the housing of the camera module for easy assembly.

Optionally, as shown in Figures 1 and 2, the first reflector 21 and the second reflector 22 can be located on the same side of the imaging lens 10 to facilitate the transmission of light through the first reflector 21 and the second reflector 22, which is beneficial to the coordination of the first reflector 21 and the second reflector 22 and can reduce the space occupied by the first reflector 21 and the second reflector 22.

Optionally, as shown in FIG. 1 , the imaging lens 10 may include at least one aspherical lens 11 . For example, the imaging lens 10 may include two aspherical lenses 11 , and the optical axes of the two aspherical lenses 11 may be collinear.

The imaging lens 10 can be composed of two plastic even-order aspheric lenses 11. The two aspheric lenses 11 have low refractive index and high Abbe number, and high refractive index and low Abbe number, respectively, which can be used to correct light aberration and can clearly image on the imaging chip 30. Its maximum diameter is greater than its thickness, thus breaking through the size limitation on large aperture. The surface shape of the two aspheric lenses 11 satisfies the aspheric formula describing the aspheric surface:

Among them, Z is the sag of the surface parallel to the Z axis (the Z axis is consistent with the optical axis), c is the curvature of the surface (the inverse of the radius of curvature r of the surface), K is the cone coefficient, and A, B, C, D, E, F, G and H are aspheric coefficients. The surface design coefficients of the lens can be shown in Tables 1 to 3.

Table 1 Surface design coefficients of lenses

Table 2 Surface design coefficients of lenses

Face number A B C D S1 -1.97E-03 7.84E-03 -1.18E-02 9.04E-03 S2 4.25E-04 -2.26E-03 4.73E-03 -5.41E-03 S3 6.11E-03 -2.61E-02 4.35E-02 -3.77E-02 S4 4.39E-03 -1.93E-02 3.36E-02 -3.03E-02

Table 3 Surface design coefficients of lenses

Face number E F G H S1 -3.94E-03 1.01E-03 -1.48E-04 1.13E-05 S2 3.54E-03 -1.35E-03 2.97E-04 -3.45E-05 S3 1.88E-02 -5.59E-03 9.68E-04 -8.95E-05 S4 1.58E-02 -4.92E-03 9.06E-04 -9.09E-05

In some embodiments, as shown in FIGS. 1 to 3 , the camera module may further include: an imaging chip 30, which may be disposed adjacent to the second reflector 22 in the light transmission lens group away from the imaging lens 10, and the light emitted from the second reflector 22 in the light transmission lens group away from the imaging lens 10 is projected onto the imaging chip 30, and an image may be formed on the imaging chip 30. The imaging chip 30 has a photoelectric conversion function, and processes the light passing through the lens and each reflector and finally forms an image.

In some embodiments, as shown in Figures 1 to 3, the camera module may also include: a filter 40, which can be arranged between the imaging chip 30 and the second reflector 22 in the light transmission lens group away from the imaging lens 10. The filter 40 can filter out unnecessary light. For example, the filter 40 can be an infrared filter, and the filter 40 can be a glass sheet coated with an infrared reflective film, which can filter out infrared light to reduce the influence of unnecessary light on imaging.

As shown in FIG2 , the camera module may further include a housing 12, and other structures in the camera module may be arranged inside the housing 12, for example, the imaging lens 10, the first reflector 21, the second reflector 22, the imaging chip 30 and the filter 40 may be arranged inside the housing 12. The housing 12 may be composed of a lightweight and high-strength alloy steel to achieve the overall encapsulation of the module and the protection of the internal components, and reduce the size in the thickness direction. The camera module may further include a driving mechanism 13, such as a motor, which may be an OIS (optical image stabilization) motor, which may achieve the automatic focus and optical image stabilization of the lens.

The embodiment of the present application provides an electronic device, including the camera module described in the above embodiment, and the thickness direction of the electronic device can be the same as the optical axis direction of the imaging lens 10. Through the arrangement of the first reflector 21 and the light transmission lens group, the light can be transmitted along the direction perpendicular to the optical axis of the imaging lens 10, and the light emitted by the light transmission lens group can be imaged on the imaging chip 30, which can reduce the height of the camera module in the optical axis direction of the imaging lens, and does not require the cutting edge of the lens, thereby avoiding the problem of smaller aperture and astigmatism caused by reducing the height by cutting the edge of the lens, ensuring the effect of the aperture, improving the shooting effect, and improving the user experience.

In some embodiments, as shown in FIG5 , the electronic device may include: a frame 50 and a back cover 51, the back cover 51 may be disposed on the frame 50, the side of the back cover 51 away from the frame 50 may have a raised structure 52, and the imaging lens 10 may be disposed on the raised structure 52. The Z direction may be the thickness direction of the electronic device, the X direction may be the length direction of the electronic device, and the Y direction may be the width direction of the electronic device. Part of the structure of the camera module may be disposed on the raised structure 52, which will not increase the overall thickness of the electronic device (such as a mobile phone), can solve the problem of increased thickness caused by a large aperture periscope lens, and is conducive to the thinness of the device.

The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims (11)

1. A camera module, comprising: Imaging lenses; A first reflector, wherein the first reflector is disposed on one side of the imaging lens, and the first reflector and the imaging lens are spaced apart from each other along an optical axis direction of the imaging lens; A light transmission lens group, wherein the light transmission lens group includes a plurality of second reflectors; An imaging chip, wherein the imaging chip is disposed adjacent to a second reflector in the light transmission lens group far from the imaging lens, and light emitted from the second reflector in the light transmission lens group far from the imaging lens is projected onto the imaging chip; The light incident on the light transmission lens group is transmitted through the second reflector in the light transmission lens group and is emitted from the second reflector in the light transmission lens group away from the imaging lens; Wherein, a portion of the second reflector close to the imaging lens is located between the first reflector and the imaging lens, and a portion of the second reflector located between the first reflector and the imaging lens can transmit and reflect light, and the light transmitted from the portion of the second reflector located between the first reflector and the imaging lens is projected onto the first reflector, and the first reflector reflects the light projected onto the reflecting surface of the first reflector, so that the light reflected by the first reflector is projected onto the second reflector close to the imaging lens in the light transmission lens group, and the light reflected by the first reflector is projected onto the portion of the second reflector located between the first reflector and the imaging lens, and the light reflected by the portion of the second reflector located between the first reflector and the imaging lens is projected onto the second reflector close to the imaging lens in the light transmission lens group. 2. The camera module according to claim 1 is characterized in that a plurality of the second reflectors are arranged in sequence along a direction perpendicular to the optical axis of the imaging lens, and two adjacent second reflectors are spaced apart in the direction of the optical axis of the imaging lens. 3. The camera module according to claim 1 or 2 is characterized in that the orthographic projections of two adjacent second reflectors on the first plane partially overlap, and the first plane is a plane perpendicular to the optical axis of the imaging lens. 4. The camera module according to claim 1 is characterized in that the transmittance of the part of the second reflector located between the first reflector and the imaging lens is 30%-70%, and the reflectivity of the part of the second reflector located between the first reflector and the imaging lens is 30%-70%. 5. The camera module according to claim 1 or 2 is characterized in that the reflection surface of the first reflector is total reflection, the reflection surface of the second reflector in the light transmission lens close to the imaging lens and located on the outer periphery of the imaging lens is total reflection, and the reflection surface of the second reflector in the light transmission lens far from the imaging lens is total reflection. 6. The camera module according to claim 1 or 2 is characterized in that two adjacent second reflectors are arranged in parallel and spaced apart in the optical axis direction of the imaging lens. 7. The camera module according to claim 1 or 2, characterized in that the first reflector and the second reflector are located on the same side of the imaging lens. 8. The camera module according to claim 1, characterized in that the imaging lens includes at least one aspherical lens. 9. The camera module according to claim 1, further comprising: A filter is disposed between the imaging chip and a second reflector in the light transmission lens group that is away from the imaging lens. 10. An electronic device, characterized in that it comprises the camera module according to any one of claims 1 to 9; The thickness direction of the electronic device is the same as the optical axis direction of the imaging lens. 11. The electronic device according to claim 10, characterized in that the electronic device comprises: A frame and a back cover, wherein the back cover is arranged on the frame, a side of the back cover away from the frame has a convex structure, and the imaging lens is arranged on the convex structure.