CN116017119A - Camera module and electronic equipment - Google Patents

Abstract

The application discloses a camera module and electronic equipment, wherein the camera module comprises a lens assembly, an image sensor and a zooming module, and the image sensor is arranged opposite to the lens module; the zoom module comprises a lens and a driving assembly, the lens is arranged on one side of the image sensor, which is close to the lens assembly, and the lens comprises at least two light-transmitting areas with different focal lengths; the driving assembly is connected with the lens and is used for driving the lens to move so as to enable the target light-transmitting areas in at least two light-transmitting areas to move to the position opposite to the image sensor.

Description

Camera module and electronic equipment

Technical Field

The application belongs to the technical field of electronic equipment, and particularly relates to a camera module and electronic equipment.

Background

In recent years, the functional requirements of consumers on mobile phones are more and more diversified, the conventional ultra-wide-angle shooting has become the basic capability of the mobile phones, long-focus lenses with longer histories are more and more favored, and in addition, some consumers want to have macro capability, blurring capability and the like.

The zooming of the mobile phone camera is mainly divided into three modes of digital zooming, optical zooming and relay type zooming, wherein relay type zooming is the current mainstream zooming scheme. The relay type zooming mode is that a smoother zooming effect is realized by utilizing the difference of physical focal lengths of two or more fixed-focus lenses through lens switching and algorithm assistance. However, imaging in the process is mainly cut by an algorithm, so that obvious damage to image quality occurs, and continuous high-quality images are difficult to obtain in the zooming ratio conversion process.

Disclosure of Invention

The application aims at providing a camera module and electronic equipment, and at least solves the problem that the image quality is obviously damaged in the zooming process.

In order to solve the technical problems, the application is realized as follows:

in a first aspect, the present application proposes a camera module, including:

a lens assembly;

an image sensor disposed opposite the lens assembly;

the zoom module comprises a lens and a driving assembly, the lens is arranged on one side, close to the lens assembly, of the image sensor, and the lens comprises at least two light-transmitting areas with different focal lengths;

the driving assembly is connected with the lens and is used for driving the lens to move so as to enable the target light-transmitting areas in at least two light-transmitting areas to move to the position opposite to the image sensor.

In a second aspect, the present application proposes an electronic device, including the camera module set described in the first aspect above.

In an embodiment of the application, the camera module comprises a lens assembly, an image sensor and a zooming module, wherein the zooming module comprises a lens and a driving assembly. The lens is provided with at least two light-transmitting areas with different focal lengths, and the position of the lens is adjusted through the driving assembly, so that the target light-transmitting areas in the at least two light-transmitting areas move to the positions opposite to the image sensor. Therefore, the target light transmission areas with different focal lengths on the lens are respectively matched with the lens assembly, the integral focal length of the camera module is changed, the camera module realizes optical zooming, and a high-quality image can be continuously obtained in the focal length conversion process.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, wherein:

FIG. 1 is a schematic diagram of an image capturing module according to an embodiment of the present disclosure;

FIG. 2 is a second schematic diagram of an image capturing module according to the embodiment of the present application;

FIG. 3 (a) is a third schematic diagram of an image capturing module according to the embodiment of the present application;

FIG. 3 (b) is a schematic diagram of an image capturing module according to an embodiment of the present application;

FIG. 3 (c) is a schematic diagram of an image capturing module according to an embodiment of the present application;

FIG. 4 is a schematic diagram of an image capturing module according to an embodiment of the present application;

FIG. 5 is a schematic diagram of a camera module according to an embodiment of the present disclosure;

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

FIG. 7 is a schematic diagram of a pixel cell array of an image sensor according to an embodiment of the present application;

FIG. 8 is a second schematic diagram of a pixel cell array of an image sensor according to an embodiment of the present disclosure;

fig. 9 is a schematic diagram of a signal control circuit of an image sensor according to an embodiment of the present application;

FIG. 10 is a schematic view of a zoom module according to a first embodiment of the present application;

FIG. 11 is a relative illuminance diagram of the camera module of FIG. 10;

FIG. 12 is a distortion diagram of the camera module corresponding to FIG. 10;

FIG. 13 is a vertical axis color difference chart of the camera module corresponding to FIG. 10;

fig. 14 is a schematic view of a zoom module according to a second embodiment of the present application;

FIG. 15 is a relative illuminance diagram of the camera module of FIG. 14;

FIG. 16 is a distortion diagram of the camera module corresponding to FIG. 14;

fig. 17 is a vertical axis color difference diagram of the image capturing module corresponding to fig. 14.

Reference numerals:

100. a lens assembly; 110. a fixed focus lens;

200. a drive assembly; 210. a column; 220. a universal wheel;

300. a lens; 310. a lens monomer; 311. a first arc-shaped portion; 312. a second arc-shaped portion; 313. a third arc-shaped portion; 314. a fourth arc-shaped portion; 315. a first lens unit; 3151. a first concave portion; 3152. a first boss; 316. a second lens unit; 3161. a second concave portion; 3162. a second protruding portion; 320. a first light-transmitting region; 321. a first focal region; 322. a first zoom region; 330. a second light-transmitting region; 331. a second fixed focus area; 332. a second zoom region; 340. a third light-transmitting region; 341. a third fixed focus area; 342. a third zoom region;

400. an image sensor; 410. a pixel unit; 420. a signal control circuit;

500. an optical filter.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functionality throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

The features of the terms "first", "second", and the like in the description and in the claims of this application may be used for descriptive or implicit inclusion of one or more such features. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

The structure of the camera module disclosed according to the embodiment of the present application is described below with reference to fig. 1 to 8.

As shown in fig. 1, some embodiments of the present application provide a camera module, including:

a lens assembly 100;

an image sensor 400, the image sensor 400 being disposed opposite to the lens assembly 100;

the zoom module comprises a lens 300 and a driving assembly 200, the lens 300 is arranged on one side of the image sensor 400 close to the lens assembly 100, and the lens 300 comprises at least two light-transmitting areas with different focal lengths;

the driving assembly 200 is connected to the lens 300, and the driving assembly 200 is used for driving the lens 300 to move so that a target light-transmitting region of at least two light-transmitting regions moves to a position opposite to the image sensor 400.

Lenses can be divided into two main categories, zoom and fixed focus. The focal length of the zoom lens is variable, the visual angle is variable, and the zoom lens is a lens capable of being pushed and pulled; the focal length of the fixed focus lens cannot be changed, i.e. the fixed focus lens has only one focal segment or has only one viewing angle. The camera module provided by the application comprises a lens assembly 100, wherein the lens assembly 100 comprises at least two lenses.

In order to further improve the shooting performance of the camera module, the camera module may further include an optical filter 500. The optical filter 500 is disposed between the image sensor 400 and the lens assembly 100, and is used for filtering infrared light invisible to human eyes during photographing in daytime, so as to improve resolution of an acquired image and color reproducibility, and further improve quality of the image acquired by the camera module.

The camera module provided by the application comprises an image sensor 400. Image sensors (sensors) are the core of cameras and are the most critical technology in cameras. Image sensors are divided into two types, one is a widely used CCD (Charge-coupled Device); the other is a CMOS device (Complementary Metal Oxide Semiconductor ). In comparison with conventional cameras, the conventional camera uses "film" as a carrier on which information is recorded, whereas the "film" of the digital camera is an imaging photosensitive element thereof, which is an unreplaced "film" of the digital camera and is integral with the camera.

Currently, CMOS devices, which are semiconductors that can record light changes in digital cameras, like CCDs, are mainly used. The CMOS manufacturing technology mainly uses the semiconductor made of two elements of silicon and germanium, so that the semiconductor with N (negatively charged) and P (positively charged) stages coexist on the CMOS, and the current generated by the complementary effect of the two electrodes can be recorded and interpreted into an image by a processing chip.

The CMOS camera module (CMOS Camera Module, CCM) is a camera module currently used in mobile phones, and is composed of a Lens, a Voice Coil Motor, an infrared Filter 500, an image sensor, a digital signal processor (Digital Signal Processor, DSP) and a flexible circuit board (Flexible Printed Circuit, FPC).

In the prior art, the working process of CCM is that the voice coil motor drives the lens to reach the accurate focusing position, the external light passes through the lens assembly, and is filtered by the infrared filter, and irradiates onto the photo diode (pixel) of the image sensor, the photo diode converts the sensed light signal into an electric signal, and a digital signal matrix (i.e. image) is formed by an amplifying circuit and an analog-to-digital conversion (ADC) analog-to-digital conversion circuit, and then processed by the digital signal processor, compressed and stored.

Limited by the volume of the camera module in the electronic device, the number of lenses 110 provided in the lens assembly 100 is limited, and movement of the lenses 110 is limited. Therefore, the camera module usually adopts a relay type zooming mode, namely the camera module comprises at least two lenses with different focal lengths, and a smoother zooming effect is realized by utilizing the difference of physical focal lengths of the two or more lenses and the assistance of a lens switching and algorithm.

However, in the zooming process, the zooming effect achieved through lens switching and algorithm assistance is poor, and obvious damage can occur to the obtained image quality. In order to solve the problem, the camera module provided in the embodiment of the application further includes a zoom module.

Referring to fig. 2, in an embodiment of the present application, a zoom module includes a lens 300 and a driving assembly 200. The lens 300 is disposed on a side of the image sensor 400 close to the lens assembly 100, that is, the external light sequentially passes through the lens assembly 100 and the lens 300 and then enters the image sensor 400.

Referring to fig. 3-4, the lens 300 includes at least two light-transmitting regions having different focal lengths. That is, at least two light-transmitting regions are disposed on the lens 300, and focal lengths of different light-transmitting regions are different. Further, the driving assembly 200 is connected to the lens 300, and the driving assembly 200 is configured to drive the lens 300 to move so that a target light-transmitting region of at least two light-transmitting regions is moved to a position opposite to the image sensor 400.

Wherein the target light-transmitting region is one of the at least two light-transmitting regions. In practical use, the target light-transmitting area is selected according to the required focal length, and then the target light-transmitting area is moved to a position opposite to the image sensor 400 by the driving assembly 200, and the external light is transmitted through the target light-transmitting area and enters the image sensor 400.

Specifically, in one embodiment of the present application, as shown in fig. 2, the area of the image sensor 400 is smaller than the area of the lens 300, and the image sensor 400 is disposed eccentrically at the projection position of the lens 300. The lens 300 moves under the driving action of the driving assembly 200, so that the target light transmission areas with different focal lengths are respectively moved to positions opposite to the image sensor according to the change of the movement positions of the lens 300, that is, the focal lengths of the lens 300 positioned opposite to the image sensor are different. That is, the focal length of the transparent area of the lens 300 through which the external light passes is different.

It should be noted that, the driving assembly 200 may be a single movement, such as horizontal movement, vertical movement, or rotation, or may be a combination of multiple movement methods. The moving manner of the lens 300 is not limited in the present application as long as the focal length of the lens 300 at a position opposite to the image sensor 400 is changed.

In the camera module provided by the application, the lens 300 is provided with a plurality of light transmission areas with different focal lengths, the target light transmission area is selected according to the required focal length, then the target light transmission area is moved to the position opposite to the image sensor 400 through the driving assembly 200, the lens 300 is matched with the lens assembly 100 together, the overall focal length of the camera module is changed, and the light path of an external light source incident into the image sensor is changed. In the zooming process of the camera module, compared with the zooming effect realized through algorithm assistance, the camera module provided by the application can realize the change of the optical focal length of the camera module, namely optical zooming, and can continuously obtain high-quality images in the zooming process.

In this embodiment of the present application, the light-transmitting area includes a fixed focus area and a zoom area, and the zoom area is disposed between two adjacent fixed focus areas.

Specifically, the lens 300 includes a first light-transmitting region 320, a second light-transmitting region 330, and a third light-transmitting region 340;

the first light-transmitting area 320 includes a first focusing area 321 with a focal length F1, and a first zooming area 322 with a focal length F10;

the second light-transmitting area 330 includes a second lens Jiao Ouyu 331 with a focal length F2 and a second zoom area 332 with a focal length F20;

the third light-transmitting area 340 includes a third fixed focus area 341 with a focal length F3, and a third zoom area 342 with a focal length F30;

wherein F1 is less than F2 and less than F3, F1 is less than F10 and less than F2, F2 is less than F20 and less than F3, and F3 is less than F30.

In a specific embodiment of the present application, it is assumed that the focal lengths of the first fixed focal region 321, the second fixed focal region 331 and the third fixed focal region 341 are sequentially increased by 2 times, that is, the focal length of the first fixed focal region 321 is 25mm, the focal length of the second fixed focal region 331 is 50mm, and the focal length of the third fixed focal region 341 is 100mm. The optical magnification corresponding to the first fixed focus region 321 to the third fixed focus region 341 is sequentially 1x,2x, and 4x.

The process that the camera module is in the working state is as follows:

when the user uses the very short distance shooting, the required focal length is not large, the target area is the first focal area 321, and at this time, the driving component 200 drives the lens 300 to move, so that the light transmitted through the lens component 100 passes through the first focal area 321 with the focal length of 25mm and is transmitted to the image sensor 400 to be imaged, as shown in fig. 3 (a).

When a user wants to shoot a short-distance object, the user can control the camera module to increase the focal length through stretching operation on the preview interface of the camera module. At this time, the driving assembly 200 drives the lens 300 to move, so that the light transmitted through the lens assembly 100 moves from the first focal region 321 with a focal length of 25mm to the second focal region Jiao Ouyu 331 with a focal length of 50mm, as shown in fig. 3 (c). The moving path from the first fixed focus area 321 to the second fixed focus area 331 must pass through the first zoom area 322 as shown in fig. 3 (b).

When the user wants to shoot a middle or long-distance scene, the user can continue stretching operation on the preview interface of the camera module to control the camera to increase the focal length. At this time, the driving assembly 200 drives the lens 300 to move, so that the light transmitted through the lens assembly 100 moves from the second focusing area 331 with a focal length of 50mm to the third focusing area 341 with a focal length of 100mm. Wherein the moving route from the second fixed focus area 331 to the third fixed focus area 341 must pass through the second zoom area 332.

Similarly, if the user wants to continuously photograph a scene farther, the lens 300 is continuously moved, and the target light transmission areas with different focal lengths are selected, so that the operation process is the same and will not be repeated.

It should be noted that if the lens 300 is large enough or the process is advanced enough, N (N > 2) fixed focus regions of different focal lengths may be fabricated on the lens 300, and a zoom region may be disposed between adjacent fixed focus regions. When the lens 300 is used, the imaging light path passes through the target light transmission areas with different focal lengths by only moving the lens, so that the electrodeless optical zoom of the camera module can be realized.

In the embodiment of the present application, the lens 300 is disposed between the lens assembly 100 and the image sensor 400.

In this embodiment, the lens assembly 100 includes at least two lenses 110, and the lens 300 may be disposed between the two lenses 110, as shown in fig. 4. Or may be disposed between the lens 110 and the image sensor 400.

Assuming that the number of lenses 110 in the lens assembly 100 is N1, the number of light-transmitting areas on the lens 300 is N2, N2. Gtoreq.N 1. That is, in the image capturing module provided in the present application, the number of light transmitting areas with different focal lengths on the lens 300 is not less than the number of lenses 110 in the lens assembly 100, so as to achieve the cooperation between the multifocal lens and the lens assembly 100.

The setting position of the lens 300 is not particularly limited, and may be set according to actual needs. The lens 300 is matched with the lens 110 positioned on one side of the lens 300 away from the image sensor 400, so that stepless adjustment of the focal length of the camera module is realized.

In this embodiment, the lens 300 includes a lens unit 310, at least two light-transmitting areas on the lens unit 310 are sequentially arranged along a first direction, and focal lengths of the at least two light-transmitting areas are sequentially increased along the first direction.

Referring to fig. 4, the lens 300 is provided with one lens unit 310, and a plurality of light-transmitting areas having different focal lengths are distributed on the one lens unit 310, and the plurality of light-transmitting areas are sequentially arranged along a first direction, wherein the focal lengths of the light-transmitting areas sequentially increase in the first direction.

The first direction is not limited to a specific direction, and may be any direction on the plane of the lens 300.

In a specific embodiment of the present application, the lens 300 is configured as a disc structure, where the first direction may be along a radial direction of the disc structure, and of course, the first direction may also be a circumferential direction of the disc structure, as shown in fig. 4.

In the embodiment of the application, the light-transmitting areas with different focal lengths are arranged according to the focal length size rule, so that the regular movement of the lens 300 in the zooming process is realized, the ineffective movement in the movement process of the lens 300 is reduced, and the movement efficiency of the lens 300 is improved.

In this embodiment, referring to fig. 4-5, one side of the lens unit 310 is a planar portion, the other side is an arc portion, the arc portion includes a first arc portion 311, a second arc portion 312, a third arc portion 313 and a fourth arc portion 314 that are sequentially set, where the first arc portion 311 and the second arc portion 312 are recessed toward one side close to the planar portion, and the third arc portion 313 and the fourth arc portion 314 are raised toward one side far away from the planar portion.

Specifically, referring to fig. 5, the first arc portion 311, the second arc portion 312, the third arc portion 313 and the fourth arc portion 314 are enclosed to form an annular structure, and by controlling the lens 300 to rotate, the target areas in the plurality of light-transmitting areas can be sequentially moved to the positions corresponding to the image sensor 400, so as to adjust the focal length of the whole camera module.

In this embodiment, the zoom area includes a first lens unit 315 and a second lens unit 316, and the first lens unit 315 and the second lens unit 316 are stacked. Of course, the zoom area may also include a plurality of lens units, and the number of lens units is not limited in this application, and may be adjusted according to actual use.

Referring to fig. 6, the zoom area includes a first lens unit 315 and a second lens unit 316, and the first lens unit 315 and the second lens unit 316 are disposed to be stacked one on top of the other, and the first lens unit 315 and the second lens unit 316 are relatively moved to achieve a zoom effect. Specifically, when the camera module is in an operating state, external light first passes through the lens assembly 100, then sequentially passes through the first lens unit 315 and the second lens unit 316, and is focused on the image sensor 400.

The lens 300 in this application includes a first lens unit 315 and a second lens unit 316 that are stacked, and a plurality of light-transmitting areas with different focal lengths are disposed on each of the first lens unit 315 and the second lens unit 316. In this way, as the driving assembly 200 drives the first lens unit 315 and the second lens unit 316 to relatively move, the light-transmitting areas with different focal lengths are combined with each other, so that more focal lengths are obtained, thereby greatly increasing the focal length range adjustable by the lens 300 and improving the precision range of the focal length adjustable by the camera module.

The first lens unit 315 and the second lens unit 316 are disposed opposite to each other, and include not only the arrangement facing each other in the vertical direction as shown in fig. 6, but also the arrangement facing each other in the horizontal direction. The relative arrangement of the first lens unit 315 and the second lens unit 316 may be set according to actual needs.

In this embodiment, the first lens unit 315 includes a first concave portion 3151 and a first convex portion 3152, the second lens unit 316 includes a second concave portion 3161 and a second convex portion 3162, and the driving component is configured to drive the first lens unit 315 to move relative to the second lens unit 316 so as to change the focal length of the zoom region;

in a case where the positional relationship between the first lens unit 315 and the second lens unit 316 satisfies a first positional relationship, the first protrusion 3152 corresponds to the second protrusion 3162, and the first recess 3151 corresponds to the second recess 3161;

in the case where the positional relationship between the first lens unit 315 and the second lens unit 316 satisfies the second positional relationship, the first protrusion 3152 corresponds to the second recess 3161.

Specifically, the first lens unit 315 includes a first concave portion 3151 and a first convex portion 3152, and the second lens unit 316 includes a second concave portion 3161 and a second convex portion 3162. Of course, the first lens unit 315 and the second lens unit 316 may further include more arc-shaped portions, where the number of arc-shaped portions is not limited in the present application, and the greater the number of arc-shaped portions, the greater the focal length adjustment range of the corresponding lens 300.

When the positional relationship between the first lens unit 315 and the second lens unit 316 satisfies the first positional relationship, the first protrusion 3152 is disposed opposite to the second protrusion 3162, and the first recess 3151 is disposed opposite to the second recess 3161.

When the positional relationship between the first lens unit 315 and the second lens unit 316 satisfies the second positional relationship, the first protrusion 3152 and the second recess 3161 are disposed opposite to each other, as shown in fig. 6.

In addition, the arc-shaped portions of the first lens unit 315 and the second lens unit 316 may be disposed opposite to each other, or, of course, the plane portions of the first lens unit 315 and the second lens unit 316 may be disposed opposite to each other, which is not particularly limited in the embodiment of the present application.

In this embodiment, the driving assembly 200 includes a stand 210, a microelectromechanical device, and a gimbal 220, where the gimbal 220 is disposed between the stand 210 and the lens 300, the gimbal 220 is connected with the lens 300, and the microelectromechanical device is disposed in the stand 210, and the microelectromechanical device drives the gimbal 220 to rotate.

Referring to fig. 2, the driving assembly 200 includes a stand 210, a microelectromechanical device is disposed in the stand 210, a gimbal 220 is disposed on a side of the stand 210 facing the lens 300, the lens 300 is disposed above the gimbal 220, and the gimbal 220 abuts against the lens 300. The micro-electromechanical device is connected to the gimbal 220, and drives the gimbal 220 to rotate to drive the lens 300 to rotate.

It should be noted that, in the present application, the stand 210 is connected with the microelectromechanical device, and the stand 210 may also be configured as a telescopic rod structure, and the microelectromechanical device drives the stand 210 to stretch and retract, so as to change the distance between the lens 300 and the lens assembly 100, thereby improving the adaptability of the camera module disclosed in the present application.

In one embodiment, the physical arrangement of a color filter array (Color Filter Array, CFA) of an image sensor, such as a bayer array (bayer array), is shown in fig. 7, and the image sensor includes a pixel array including a plurality of pixel groups each including one red pixel cell, two green pixel cells, and one blue pixel cell. Of course, the color filter array (Color Filter Array, CFA) of the image sensor may be, for example, a four-in-one array or a multi-in-one (e.g., 9-in-one, 16-in-one, etc.) array, wherein, as shown in fig. 8, the four-in-one, i.e., pixel array includes a plurality of pixel groups, each pixel group includes four red pixel units, four green pixel units, and four blue pixel units. The present application is not limited in this regard.

Referring to fig. 9, the image sensor 400 further includes a signal control circuit 420 in one-to-one correspondence with each pixel unit 410.

In this embodiment, the signal control circuit 420 includes a floating switch TX1, and the photodiode PD1 of each pixel unit 410 is correspondingly connected in series to one of the floating switches TX1.

In this embodiment, the signal control circuit 420 further includes: the first capacitor FD1, the first capacitor FD1 is connected between the signal terminal Vs and the ground terminal GND. And a reset switch RST connected between the power supply terminal VDD and the signal terminal Vs. The source follower SF has a gate connected to the signal terminal Vs and a drain connected to the power supply terminal VDD. A selection switch SET connected between the source of the source follower SF and the output of the image sensor 400.

The following describes the exposure process of the pixel unit 410, including the steps of:

in step 101, the reset switch RST and the floating switch TX1 are turned on, the photodiode PD1 is reset, and the electrons inside the photodiode PD1 and the capacitor FD1 are cleared to zero.

In step 102, the reset switch RST and the floating switch TX1 are turned off, and the photo diode PD1 starts to store light (corresponding to the exposure start time), and the voltage difference is generated across the two ends.

Step 103, the reset switch RST is turned on to empty the electrons in the first capacitor FD1 again, so as to avoid interference or coupling caused by current electrons generated in the electronic circuit.

In step 104, the reset switch RST is turned off, the floating switch TX1 is turned on, the selection switch SET is turned on (corresponding to the exposure end time), electrons generated by the photosensitive of the photo diode PD1 are stored in the first capacitor FD1, and the Vout end outputs a voltage signal to the column amplifier corresponding to the sensor pixel unit.

In the embodiment of the application, the reset switch RST, the floating switch TX1 and the selection switch SET can be controlled by an external timing circuit or a timing control circuit in the processor to work together in order.

In this embodiment, each pixel unit is correspondingly provided with a signal control circuit, so that independent exposure control of the pixel unit can be realized, and the dynamic range of the image sensor can be enlarged.

Taking the lens comprising two lens monomers as an example, the focal length is changed by adjusting the radius of curvature and the distance at the relative positions of the two lens monomers.

Example 1

Referring to fig. 10, specific data of the first lens unit and the second lens unit refer to the following table 1:

TABLE 1

	Radius of curvature/mm	Distance/mm	Clear aperture
				Object	Infinity (infinity)	Infinity (infinity)	0.000
Lens1 F	60.000	4.000	12.500
				Lens1 B	-60.000	10.000	12.500
Lens2 F	28.000	4.000	10.000
				Lens2 B	-28.000	23.000	10.000
Image processing apparatus	Infinity (infinity)	-	11.389

Wherein Lens1 is the first Lens unit 315 located on the left side in fig. 10, and Lens2 is the second Lens unit 316 located on the right side in fig. 10. F is the light entrance surface of the lens, i.e., the left side surface in fig. 10. B is the light exit surface of the lens, i.e. the right side surface in fig. 10. The distances in table 1 refer to the minimum distance between one side surface of the lens unit and the next adjacent surface.

The focal length calculation formula of the lens is as follows:

1/f＝(n-1)[1/R1-1/R2+(n-1)d/(nR1R2)]；

where R is the radius of curvature, n is the refractive index, and d is the minimum distance between one side surface of the lens unit and the next adjacent surface.

The image pickup module in the embodiment of the application is subjected to point list simulation. After passing through the optical system, many light rays emitted from one point are not concentrated at the same point due to aberration, so that a dispersed graph scattered in a certain range is formed, which is called a point list graph. Simulation results show that the camera module of the embodiment has good effect of collecting parallel light from different view fields, small light dispersion range and good imaging quality.

In addition, the image capturing module of the present embodiment also performs simulation of a modulation transfer function diagram, that is, a MTF (Modulation Transfer Function) graph. The MTF graph refers to the relationship between the modulation degree and the logarithm of lines per millimeter in an image, and is used to evaluate the reduction ability to a scene detail. The MTF value of the central view field of the optical module in the embodiment can reach more than 0.5 at the view field frequency of 200 lp/mm. The image pickup module provided in the embodiment has high resolution and good imaging quality.

Fig. 11 shows a relative illuminance map of the camera module. In fig. 11, the horizontal axis represents the image height (distance from the imaging center, in mm), and the vertical axis represents the relative brightness of the periphery at a center light amount of 1. As can be seen from the figure, the relative brightness remains above 0.6 at a distance of 9mm from the imaging center. The embodiment shows that the camera module provided by the embodiment has high relative illumination and uniform brightness of an imaging picture.

The image pickup module of this embodiment is subjected to distortion simulation, and the simulation result is shown in fig. 12, where distortion refers to aberration of different magnification of different parts of an object when the object is imaged by a projection lens, and the distortion may cause deterioration of similarity of an object image, but does not affect definition of the image. According to the results of FIG. 12, the optical distortion of the camera module provided in this embodiment is less than-10%, and meets the requirement of viewing by human eyes.

Fig. 13 shows a vertical axis color difference diagram of the camera module. The vertical axis chromatic aberration is also called as chromatic aberration of magnification, and mainly refers to a multi-color principal ray, which is changed into multiple rays when exiting from an image side due to chromatic dispersion of a refraction system, and is the difference of focal positions of hydrogen blue light and hydrogen red light on an image plane. According to fig. 15, the vertical chromatic aberration of the image capturing module provided in the first embodiment is less than 6mm, the overlapping degree of the three-color light is high, the imaging smear degree is very low, and the imaging quality is good.

Example two

Referring to fig. 14, specific data of the first lens unit and the second lens unit refer to the following table 2:

TABLE 2

	Radius of curvature/mm	Distance/mm	Clear aperture
				Object	Infinity (infinity)	Infinity (infinity)	0.000
Lens1 F	60.000	4.000	12.500
				Lens1 B	-60.000	20.000	12.500
Lens2 F	30.000	4.000	10.000
				Lens2 B	-30.000	13.000	10.000
Image	Infinity	-	0.985

Wherein Lens1 is the first Lens unit 315 located on the left side in fig. 14, and Lens2 is the second Lens unit 316 located on the right side in fig. 14. F is the light entrance surface of the lens, i.e., the left side surface in fig. 14. B is the light exit surface of the lens, i.e. the right side surface in fig. 14. The distances in table 2 refer to the minimum distance between one side surface of the lens unit and the next adjacent surface.

The image pickup module of this embodiment is subjected to a dot-column diagram simulation. Simulation results show that the camera module of the embodiment has good effect of collecting parallel light from different view fields, small light dispersion range and good imaging quality.

In addition, the modulation transfer function diagram simulation is carried out on the camera module, and the simulation result shows that the MTF value of the central view field of the camera module at the view field frequency of 200lp/mm can reach more than 0.5. The camera module has high resolving power and good imaging quality.

Fig. 15 shows a relative illuminance map of the camera module. As can be seen from the figure, the relative brightness remains above 0.7 at a distance of 9mm from the imaging center. The embodiment shows that the camera module provided by the embodiment has high relative illumination and uniform brightness of an imaging picture.

Fig. 16 shows a distortion diagram of the camera module. According to fig. 16, the optical distortion of the camera module provided in this embodiment is less than-3%, so as to meet the requirement of viewing by human eyes.

Fig. 17 shows a vertical axis color difference diagram of the camera module. According to fig. 17, the vertical axis chromatic aberration of the image capturing module provided in the embodiment is less than 5mm, the overlapping degree of the three-color light is higher, the imaging smear degree is extremely low, and the imaging quality is better.

The embodiment of the application also discloses electronic equipment, which comprises the camera module according to any embodiment.

For example, the electronic device includes a housing having a light-transmitting portion. The camera shooting module can be arranged in the electronic equipment shell, and the lens component of the camera shooting module faces the light transmission part so as to collect images through the light transmission part.

The electronic device may be any device having a camera function, for example, a mobile phone, a tablet computer, a notebook computer, a wearable device, etc., which is not limited herein.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A camera module, comprising:

a lens assembly (100);

an image sensor (400), the image sensor (400) being disposed opposite the lens assembly (100);

the zoom module comprises a driving assembly (200) and a lens (300), wherein the lens (300) is arranged on one side, close to the lens assembly (100), of the image sensor (400), and the lens (300) comprises at least two light-transmitting areas with different focal lengths;

the driving assembly (200) is connected with the lens (300), and the driving assembly (200) is used for driving the lens (300) to move so as to enable a target light-transmitting area in at least two light-transmitting areas to move to a position opposite to the image sensor (400).

2. The camera module of claim 1, wherein the light-transmitting region comprises a fixed focus region and a zoom region, the zoom region being disposed between two adjacent fixed focus regions.

3. The camera module of claim 1, wherein the lens (300) comprises a first light transmissive region (320), a second light transmissive region (330), and a third light transmissive region (340);

the first light-transmitting region (320) comprises a first focusing region (321) with a focal length F1 and a first zooming region (322) with a focal length F10;

the second light-transmitting region (330) comprises a second fixed focus region (332) with a focal length F2 and a second zoom region (332) with a focal length F20;

the third light-transmitting region (340) comprises a third fixed focus region (341) with a focal length of F3 and a third zoom region (342) with a focal length of F30;

wherein F1 is less than F2 and less than F3, F1 is less than F10 and less than F2, F2 is less than F20 and less than F3, and F3 is less than F30.

4. The imaging module according to claim 1, wherein the lens (300) is disposed between the lens assembly (100) and the image sensor (400).

5. The camera module according to claim 1, wherein the lens (300) comprises a lens unit (310), at least two light-transmitting areas on the lens unit (310) are sequentially arranged along a first direction, and focal lengths of the at least two light-transmitting areas sequentially increase along the first direction.

6. The camera module of claim 5, wherein one side of the lens unit (310) is a plane portion, the other side is an arc portion, the arc portion comprises a first arc portion (311), a second arc portion (312), a third arc portion (313) and a fourth arc portion (314) which are sequentially arranged, wherein,

the first arc-shaped part (311) and the second arc-shaped part (312) are recessed towards one side close to the plane part, and the third arc-shaped part (313) and the fourth arc-shaped part (314) are raised towards one side far away from the plane part.

7. The imaging module according to claim 2, wherein the zoom region comprises a first lens unit (315) and a second lens unit (316), the first lens unit and the second lens unit being arranged in a stack.

8. The camera module of claim 7, wherein the camera module comprises a camera module,

the first lens unit (315) comprises a first recess (3151) and a first protrusion (3152), the second lens unit (316) comprises a second recess (3161) and a second protrusion (3162), the drive assembly (200) is configured to drive the first lens unit (315) to move relative to the second lens unit (316) to change the focal length of the zoom region;

when the positional relationship between the first lens unit (315) and the second lens unit (316) satisfies a first positional relationship, the first protrusion (3152) corresponds to the second protrusion (3162), and the first recess (3151) corresponds to the second recess (3161);

the first protrusion (3152) corresponds to the second protrusion (3161) when the positional relationship between the first lens unit (315) and the second lens unit (316) satisfies a second positional relationship.

9. The camera module of claim 1, wherein the driving assembly (200) includes a post (210), a microelectromechanical device, and a gimbal (220), the gimbal (220) is disposed between the post (210) and the lens (300), the gimbal (220) is abutted to the lens (300), the microelectromechanical device is disposed in the post (210), and the microelectromechanical device drives the gimbal (220) to rotate.

10. An electronic device comprising the camera module of any one of claims 1-9.

Images