A camera focusing module, a focusing method, a terminal device and a medium

Abstract

The application relates to the field of camera technology, in particular to a camera focusing module, a focusing method, a terminal device and a medium, the camera focusing module comprising a shell, a lens, an image circuit board, an image chip, a driving assembly, a position detection assembly and a controller; the position detection assembly comprises two first position sensors and a first position magnet, the two first position sensors are sequentially arranged on the movable part along the extending direction of the optical axis, the first position magnet is arranged on the shell, the first position magnet is arranged in correspondence with the first position sensor, and the first position magnet comprises at least three magnetic pole groups, the at least three magnetic pole groups are sequentially stacked along the extending direction of the optical axis, and the magnetic poles of the adjacent magnetic pole groups facing the position sensor are opposite; the application can realize fast and accurate focusing, realize closed-loop control of focusing, and improve the focusing precision and stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of camera, in particular to a camera focusing module, a focusing method, a terminal device and a medium. BACKGROUND

[0002] In recent years, portable camera focusing modules with automatic focusing function are very popular, and basically become the standard function of most shooting devices. When the object is at different distances, the automatic focusing function can effectively improve the resolution of the close object in the image and improve the photo quality when shooting close. On the other hand, the automatic focusing function can blur the image of the object at other distances, and the object can be more prominent in the photo.

[0003] Some existing camera focusing modules have the function of large stroke focusing, but in the focusing process, the focusing time is slow due to the large stroke. At the same time, the position of the image chip in the existing camera focusing module is mostly determined by single-point detection, and the recognition information between positions is not much different. Only small and single information cannot accurately determine the correct position of the image chip, so the focusing precision is low and the image effect is poor when focusing. SUMMARY

[0004] The purpose of the present application is to provide a camera focusing module, a focusing method, a terminal device and a medium which can realize fast and accurate focusing, realize closed-loop control of focusing, and improve the focusing precision and stability.

[0005] In order to achieve the above purpose, the present application provides a camera focusing module, comprising:

[0006] A housing is provided with a movable channel along the extension direction of the optical axis;

[0007] A lens is installed on the housing, and the lens is located at one end of the movable channel;

[0008] An image circuit board has a movable part and a non-movable part, and the non-movable part is connected with the housing;

[0009] An image chip is installed on the movable part, and the image chip is located in the movable channel;

[0010] A driving assembly is connected with the movable part, which is used to drive the image chip to move in the movable channel along the extension direction of the optical axis;

[0011] A position detection assembly includes two first position sensors and a first position magnet, the two first position sensors are sequentially installed on the movable part along the direction of the optical axis, the first position magnet is installed on the shell, the first position magnet is arranged correspondingly with the first position sensor, and the first position magnet includes at least three magnetic pole groups, the at least three magnetic pole groups are sequentially stacked along the direction of the optical axis, and the magnetic poles of adjacent magnetic pole groups face each other in opposite directions.

[0012] A controller is connected with the image circuit board.

[0013] Preferably, the position detection assembly further includes a second position sensor and a second position magnet, the second position sensor is installed on the movable part, and the second position magnet is installed on the shell, the second position sensor is arranged correspondingly with the second position magnet.

[0014] Preferably, one side of the second position magnet facing the second position sensor is a single magnetic pole and is arranged obliquely along the direction of the optical axis.

[0015] Preferably, the second position magnet includes two magnetic pole groups, the two magnetic pole groups are sequentially stacked along the direction of the optical axis, and the magnetic poles of adjacent magnetic pole groups face each other in opposite directions.

[0016] Preferably, the photographing module further includes a lens seat, the lens seat is installed on one port of the movable channel, the lens seat is provided with a mounting hole coaxial with the movable channel, and the lens is installed on the mounting hole.

[0017] Preferably, the camera focusing module further includes a heat dissipation seat, the heat dissipation seat is provided with a support pipe coaxial with the movable channel, the heat dissipation seat covers the shell, the support pipe is inserted into the movable channel, and the lens seat is installed on the support pipe.

[0018] Preferably, the camera focusing module further includes a heat dissipation pipe coaxial with the movable channel, one end of the heat dissipation pipe is connected with the image circuit board, and the other end of the heat dissipation pipe is sleeved outside the image chip.

[0019] Preferably, the other end of the heat dissipation pipe is sleeved on one end of the support pipe.

[0020] Preferably, the camera focusing module further includes a chip seat, the chip seat is located in the movable channel, one end of the chip seat is connected with the movable part, and the other end of the chip seat is sleeved outside the image chip.

[0021] Preferably, the camera focusing module further comprises a sensor circuit board, the sensor circuit board is arranged along the side wall of the chip seat, one end of the sensor circuit board is connected to the movable part, and the other end of the sensor circuit board is connected to the chip seat; the first position sensor is mounted on the sensor circuit board.

[0022] Preferably, the driving assembly comprises a driving magnet and a driving coil, the driving magnet is mounted on the shell, the driving coil is mounted on the chip seat, and the driving coil is electrically connected to the image circuit board.

[0023] Preferably, the driving coil is wound around the chip seat along the circumferential direction of the optical axis.

[0024] Preferably, the camera focusing module further comprises a magnet seat, the magnet seat is arranged on the inner wall of the shell, the magnet seat has a first side wall and a second side wall adjacent to the first side wall; the first side wall is provided with a butt joint hole matched with the driving magnet, and the first position magnet is mounted on the second side wall.

[0025] Preferably, the driving coil has a first reference surface, the first reference surface is perpendicular to the optical axis, and the first reference surface is flush with the bottom surface of the driving coil; the positional relationship between the driving coil and the first position sensor satisfies:

[0026] |50%L1-L2|<20%L1;

[0027] Wherein, L1 is the minimum distance between the top end of the driving coil and the first reference surface, and L2 is the minimum distance between the center of the first position sensor and the first reference surface.

[0028] Preferably, the image circuit board is provided with a relay, the relay is electrically connected to the driving coil;

[0029] Wherein, when the driving coil is powered off, the two ends of the driving coil can be conducted through the relay.

[0030] Preferably, the chip seat has a butt joint side wall, the butt joint side wall is provided with a sliding groove extending along the extension direction of the optical axis on both sides, and the sliding groove is provided with a plurality of rolling balls stacked in sequence along the extension direction of the optical axis; the chip seat slides relative to the shell through the rolling balls.

[0031] Preferably, the image circuit board has a second reference surface, the second reference surface is perpendicular to the extension direction of the optical axis, and the second reference surface is flush with the top surface of the image circuit board, part of the rolling balls are located above the second reference surface, and part of the rolling balls are located below the second reference surface.

[0032] Preferably, the chip seat has repulsion side walls facing the driving magnets, and the repulsion side walls are provided with repulsion magnets corresponding to the driving magnets.

[0033] Preferably, the image focusing module further comprises a bottom cover, the bottom cover is buckled to the bottom end of the shell, and the side wall of the bottom cover is provided with a through hole for the image circuit board to extend out.

[0034] Preferably, the image circuit board further comprises a plurality of bending parts, the plurality of bending parts are sequentially stacked and connected along the extension direction of the optical axis, the bending part at the top end is connected with the movable part, and the bending part at the bottom end is connected with the immovable part.

[0035] The application further provides a photographing focusing method, comprising the steps of:

[0036] obtaining the target focal length of the photographed object;

[0037] determining the target position information of the image chip according to the target focal length;

[0038] obtaining the first position information of the image chip; and obtaining the second position information of the image chip;

[0039] determining the real-time position information of the image chip according to the first position information and the second position information;

[0040] confirming whether the real-time position information matches the target position information, if yes, executing photographing using the target focal length in response to the photographing instruction of a user, and if not, performing the next step;

[0041] determining the moving stroke and the moving direction of the image chip according to the first real-time position information and the target position information, and sending a driving electric signal;

[0042] repeating the above steps.

[0043] Preferably, the numerical value A of the first position information and the numerical value B of the second position information periodically change with the movement of the image chip, and the changes of A and B satisfy:

[0044] A=Nsinα;

[0045] B=Nsin(α+π / 2);

[0046] wherein N is a non-zero real number.

[0047] Preferably, the moving track of the image chip is divided into a plurality of subintervals corresponding to A and B, the subinterval of the image chip at a certain moment is determined according to A and B at the certain moment, and the real-time position information of the image chip is determined according to the subinterval.

[0048] Preferably, the determining the real-time position information of the image chip further comprises the following steps:

[0049] acquiring third position information of the image chip;

[0050] determining the real-time position information of the image chip according to the first position information, the second position information and the third position information.

[0051] Preferably, the value C of the third position information monotonically changes with the activity of the image chip.

[0052] The application further provides a terminal device comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the focusing method according to any one of the above-mentioned embodiments when executing the computer program.

[0053] The application further provides a computer readable storage medium comprising a stored computer program, wherein the computer readable storage medium controls the device where the computer readable storage medium is located to execute the focusing method according to any one of the above-mentioned embodiments when the computer program runs.

[0054] The embodiments of the application have the following technical effects:

[0055] In the focusing process of the camera module, since the adjacent first position magnet has a plurality of magnetic pole groups, the magnetic poles of the adjacent magnetic pole groups facing the first position sensor are different, and the reading of the first position sensor changes greatly when passing through each magnetic pole, which facilitates accurate positioning of the image chip and further accurate control. Meanwhile, the first position sensor is provided with two, and further positioning can be performed through two greatly changed readings, further improving the accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0056] The application will be described in more detail below with the aid of the drawings. The technical features shown in the drawings and / or described below are generally technical features of the application and improve the application accordingly, without depending on a particular combination of technical features.

[0057] It should be noted that the same reference numerals in different drawings represent the same or approximately the same components.

[0058] Figure 1 is a camera focusing module structure schematic diagram of a preferred embodiment of the application;

[0059] Figure 2 is an exploded view of the preferred embodiment 1 of the application;

[0060] Figure 3is a top view of the preferred embodiment 1 of the present invention;

[0061] Figure 4 is a sectional view of A-A of Figure 3

[0062] Figure 5 is an enlarged view of I of Figure 4

[0063] Figure 6 is a sectional view of B-B of Figure 3

[0064] Figure 7 is a sectional view of C-C of Figure 3

[0065] Figure 8 is a schematic view of the orientation of the first position sensor;

[0066] Figure 9 is a top view of the image circuit board;

[0067] Figure 10 is an exploded view of the preferred embodiment 2 of the present invention;

[0068] Figure 11 is a vertical sectional view of the preferred embodiment 2 of the present invention;

[0069] Figure 12 is an enlarged view of E of Figure 11

[0070] Figure 13 is a horizontal sectional view of the preferred embodiment 2 of the present invention;

[0071] Figure 14 is an enlarged view of G of Figure 13

[0072] is a schematic view of the orientation of the second position sensor; Figure 15

[0073] is another schematic view of the orientation of the second position sensor; Figure 16

[0074] is a schematic view of the structure of the coil holder of the preferred embodiment 2 of the present invention; Figure 17

[0075] is a flow chart of the focusing method of the preferred embodiment 3 of the present invention; Figure 18

[0076] is a graph of the numerical change of the first position sensor of the preferred embodiment 3 of the present invention; Figure 19

[0077] Figure 20 ​​​​​​is a numerical variation chart of the second position sensor of preferred embodiment 3 of the present application;

[0078] Figure 21 is another numerical variation chart of the second position sensor of preferred embodiment 3 of the present application.

[0079] BRIEF DESCRIPTION OF DRAWINGS

[0080] 100, optical axis; 200, first reference surface; 300, second reference surface;

[0081] 1, housing; 2, lens; 3, image circuit board; 3a, movable part; 3b, immovable part; 3c, bending part; 4, image chip; 5, driving assembly; 5a, driving magnet; 5b, driving coil; 6, position detection assembly; 6a, first position sensor; 6b, first position magnet; 6c, second position sensor; 6d, second position magnet; 7, lens seat; 8, heat dissipation seat; 8a, support tube; 9, heat dissipation tube; 10, chip seat; 11, sensor circuit board; 12, magnet seat; 13, ball; 14, repulsion magnet; 15, bottom cover; 16, coil seat; 16a, boss. DETAILED DESCRIPTION

[0082] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.

[0083] The definitions of front, back, inner, outer, top and bottom are only for the convenience of describing the positional relationship or connection relationship between the components of the camera focusing module of the embodiments of the present application, and do not limit the embodiments of the present application.

[0084] It should also be noted that, for the same parts in the embodiments of the present application, only one part or component may be labeled with a reference numeral in the drawing, and it should be understood that the reference numeral is also applicable to other identical parts or components.

[0085] Meanwhile, the term "comprising" does not exclude other elements or steps, and "one" or "an" does not exclude a plurality.

[0086] In addition, it should be noted that any single technical feature described or implied in the embodiments herein, or any single technical feature shown or implied in the drawings, can still be combined between these technical features (or their equivalents) to obtain other embodiments of the present application which are not directly mentioned herein.

[0087] In addition, it should also be understood that the terms "first", "second" and the like are used herein to describe various information, but the information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, the "first" information can also be referred to as "second" information without departing from the scope of the application, and similarly, the "second" information can also be referred to as "first" information.

[0088] Embodiment 1:

[0089] Referring to Figure 1 As shown in FIG. 9, the preferred embodiment 1 of the application provides a camera focusing module, which comprises a shell 1, a lens 2, an image circuit board 3, an image chip 4, a driving assembly 5, a position detection assembly 6 and a controller. The shell 1 is provided with a movable channel along the extension direction of the optical axis 100. The lens 2 is mounted on the shell 1, and the lens 2 is located at one end of the movable channel. The image circuit board 3 has a movable part 3a and an immovable part 3b, and the immovable part 3b is connected with the shell 1. The image chip 4 is mounted on the movable part 3a, and the image chip 4 is located in the movable channel. The driving assembly 5 is connected with the movable part 3a, and is used to drive the image chip 4 to move in the movable channel along the optical axis 100. The controller is connected with the image circuit board 3.

[0090] As shown in FIG. 9, the preferred embodiment 1 of the application provides a camera focusing module, which comprises a shell 1, a lens 2, an image circuit board 3, an image chip 4, a driving assembly 5, a position detection assembly 6 and a controller. The shell 1 is provided with a movable channel along the extension direction of the optical axis 100. The lens 2 is mounted on the shell 1, and the lens 2 is located at one end of the movable channel. The image circuit board 3 has a movable part 3a and an immovable part 3b, and the immovable part 3b is connected with the shell 1. The image chip 4 is mounted on the movable part 3a, and the image chip 4 is located in the movable channel. The driving assembly 5 is connected with the movable part 3a, and is used to drive the image chip 4 to move in the movable channel along the optical axis 100. The controller is connected with the image circuit board 3. Figure 4 Figure 5 As shown in FIG. 9, the preferred embodiment 1 of the application provides a camera focusing module, which comprises a shell 1, a lens 2, an image circuit board 3, an image chip 4, a driving assembly 5, a position detection assembly 6 and a controller. The shell 1 is provided with a movable channel along the extension direction of the optical axis 100. The lens 2 is mounted on the shell 1, and the lens 2 is located at one end of the movable channel. The image circuit board 3 has a movable part 3a and an immovable part 3b, and the immovable part 3b is connected with the shell 1. The image chip 4 is mounted on the movable part 3a, and the image chip 4 is located in the movable channel. The driving assembly 5 is connected with the movable part 3a, and is used to drive the image chip 4 to move in the movable channel along the optical axis 100. The controller is connected with the image circuit board 3. Figure 8

[0091] Specifically, during focusing, the movable part 3a of the image circuit board 3 is driven by the driving assembly 5, and then the image chip 4 is driven to move along the movable channel, so as to change the relative distance between the image chip 4 and the lens 2, and achieve focusing. The two first position sensors 6a can move along the extension direction of the optical axis 100 with the movable part 3a. Due to the first position magnet 6b, the magnetic field strength sensed by the two first position sensors 6a changes with the movement, so as to determine the position of the image chip 4, and facilitate accurate control of the image chip 4. In addition, the multi-pole first position magnet 6b and the two first position sensors 6a are adopted, the reading of the first position sensor 6a changes greatly, which facilitates accurate positioning of the image chip 4, and then accurate control is achieved. At the same time, the first position sensor 6a is provided with two, and further positioning can be achieved through the two greatly changed readings, so as to further improve the accuracy. ​​

[0092] As shown in Figure 4 and Figure 6 shown, in some preferred examples of the embodiment, the camera focusing module further comprises a chip seat 10, the chip seat 10 is located in the movable channel, one end of the chip seat 10 is connected with the movable part 3a, and the other end of the chip seat 10 is sleeved with the image chip 4. In this way, the chip seat 10 can facilitate the installation and fixation of other components, avoid the disordered installation of components on the movable part 3a, and ensure the orderly assembly inside the camera focusing module.

[0093] As shown in Figure 2 and Figure 4 shown, in some preferred examples of the embodiment, the camera focusing module further comprises a sensor circuit board 11, the sensor circuit board 11 is arranged along the side wall of the chip seat 10, one end of the sensor circuit board 11 is connected with the movable part 3a, and the other end of the sensor circuit board 11 is connected with the chip seat 10; the first position sensor 6a is installed on the sensor circuit board 11. In this way, the sensor circuit board 11 can be used as an extension of the image circuit board 3, the sensor circuit board 11 is welded with the pad on the movable part 3a of the image circuit board 3, the sensor circuit board 11 is arranged in a direction parallel to the optical axis 100, which can facilitate the installation of the first position sensor 6a and the expansion of subsequent sensors such as the second position sensor 6c, avoid the excessive extension or deformation of the image circuit board 3, ensure the movement of the image chip 4 along the optical axis 100, avoid the inclination of the image chip 4, and further affect the focusing accuracy.

[0094] As shown in Figure 2 shown, in some preferred examples of the embodiment, the driving assembly 5 comprises a driving magnet 5a and a driving coil 5b, the driving magnet 5a is installed on the housing 1, and the driving coil 5b is installed on the chip seat 10 and electrically connected with the image circuit board 3. Specifically, the driving coil 5b is powered through the image circuit board 3, interacts with the driving magnet 5a, drives the movable part 3a to move along the optical axis 100, and controls the moving speed and direction of the chip seat 10 by changing the current size of the driving coil 5b; the driving coil 5b can also be connected with the sensor circuit board 11.

[0095] The existing driving coil 5b is basically distributed and arranged, and is wound on the side wall of the coil seat 16 or the chip seat 10 along the direction of the optical axis 100, which can easily cause uneven stress on the chip seat 10 and affect the focusing accuracy; in some preferred examples of the embodiment, the driving coil 5b is wound on the chip seat 10 along the circumference of the optical axis 100. Specifically, the driving coil 5b is wound on the chip seat 10 along the circumference of the optical axis 100, the driving coil 5b is an integral whole, is uniformly powered, ensures the uniform stress, and improves the focusing accuracy.

[0096] As shown in Figure 2 andFigure 4 As shown, in some preferred examples of the embodiments of the present application, the camera focusing module further comprises a magnet seat 12, the magnet seat 12 is arranged on the inner wall of the shell 1, the magnet seat 12 has a first side wall and a second side wall adjacent to the first side wall; the driving magnet 5a is installed on the first side wall, and the first position magnet 6b is installed on the second side wall. In this way, the first side wall and the second side wall are arranged adjacently, so as to avoid the driving magnet 5a and the first position magnet 6b being located on the same side wall, and avoid the magnetic interaction of the two affecting the force of the coil, thereby ensuring the accuracy of focusing.

[0097] In some preferred examples of the embodiments of the present application, the driving coil 5b has a first reference surface 200, the first reference surface 200 is perpendicular to the optical axis 100, and the first reference surface 200 is flush with the bottom surface of the driving coil 5b; the positional relationship between the driving coil 5b and the first position sensor 6a satisfies:

[0098] |50%L1-L2|<20%L1;

[0099] Wherein, L1 is the minimum distance between the top end of the driving coil 5b and the first reference surface, and L2 is the minimum distance between the center of the first position sensor 6a and the first reference surface 200.

[0100] Specifically, the height difference between the center of the first position sensor 6a and the center of the driving coil 5b is kept within a certain distance, which can ensure that the data read by the first position sensor 6a is the data of the center position of the driving coil 5b as much as possible, facilitating subsequent accurate control and ensuring the accuracy of focusing.

[0101] In some preferred examples of the embodiments of the present application, the image circuit board 3 is provided with a relay, and the relay is electrically connected with the driving coil 5b.

[0102] Wherein, when the driving coil 5b is powered off, the two ends of the driving coil 5b can be conducted through the relay. In this way, when the module is not powered on and the closed-loop control does not work normally, the relay will electrically connect the two ends of the driving coil 5b, increase the electromagnetic damping of the driving coil 5b relative to the driving magnet 5a, reduce the movement speed of the movable part 3a in the case of no power supply, improve the drop reliability and reduce unnecessary audible noise caused by the impact of the movable part 3a and the bottom cover 15.

[0103] It should be noted that when the closed conductor and the magnetic pole move relative to each other, electromagnetic resistance will be generated between them, hindering the relative movement. This phenomenon can be explained by Lenz's law: when the closed conductor cuts the magnetic induction lines, the magnetic flux passing through the closed conductor changes, and the closed conductor will generate an induced current, also called a dynamic current. The magnetic field generated by this current will hinder the relative movement of the two. The resistance is proportional to the magnetic induction intensity of the magnet, the relative movement speed and other physical quantities.

[0104] In some preferred examples of the embodiment of the present application, the chip seat 10 has a docking side wall, and the two sides of the docking side wall are provided with sliding grooves in the direction of the optical axis 100, and a plurality of rolling balls 13 are arranged in the sliding grooves in the direction of the optical axis 100 in sequence; the chip seat 10 slides relative to the shell 1 through the rolling balls 13. In this way, the rolling balls 13 can ensure the relative sliding of the chip seat 10 and the shell 1, and ensure the reliability of focusing.

[0105] In some preferred examples of the embodiment of the present application, the image circuit board 3 has a second reference surface 300, the second reference surface 300 is perpendicular to the optical axis 100, and the second reference surface 300 is flush with the top surface of the image circuit board 3, part of the rolling balls 13 are located above the second reference surface 300, and part of the rolling balls 13 are located below the second reference surface 300.

[0106] Specifically, during the focusing process of the camera focusing module, when the driving assembly 5 drives the image chip 4 to move in the movable channel, the chip seat 10 slides relative to the shell 1 through the rolling balls 13, and with the movement of the movable part 3a of the image circuit board 3, the reference surface moves, and the rolling balls 13 are always partially located above the reference surface and partially located below the reference surface, which ensures the stability of the image chip 4 during movement and solves the problem of image chip 4 tilting and image corner blur caused by soft circuit board assembly and shape tolerance when the image chip 4 moves.

[0107] Referring to Figure 2 and Figure 4 , in some preferred examples of the embodiment of the present application, the camera focusing module further comprises a bottom cover 15, the bottom cover 15 is buckled at the bottom end of the shell 1, and the side wall of the bottom cover 15 is provided with a through hole for the image circuit board 3 to extend out. In this way, the bottom cover 15 facilitates the disassembly and assembly of the camera focusing module.

[0108] Referring to Figure 7 and Figure 9 , in some preferred examples of the embodiment of the present application, the image circuit board 3 further comprises a plurality of bending parts 3c, the plurality of bending parts 3c are connected in sequence along the optical axis 100, the bending part 3c at the top end is connected with the movable part 3a, and the bending part 3c at the bottom end is connected with the immovable part 3b. Specifically, the bending part 3c has a certain deformation ability and can stretch and contract like a spring, which facilitates the movement of the movable part 3a and also ensures the movement of the movable part 3a in the direction of the optical axis 100, avoiding tilting and affecting the focusing accuracy.

[0109] Further, the number of the bending portions 3c is odd and greater than 2; each bending portion 3c comprises an included angle, and the included angle of each bending portion 3c is less than 60 degrees. Specifically, the bending portions 3c are arranged in odd number, when the bending portions 3c at the upper and lower ends are unfolded, the bending portion 3c at the middle position can play a buffering role, reducing the oblique pulling force of the bending portion 3c on the movable part 3a, and ensuring the accuracy of focusing. At the same time, the included angle of the bending portion 3c should not be too large, otherwise it is easy to lead to the increase of the overall volume of the camera focusing module.

[0110] Further, the bending portion 3c adopts a layered design, and there is a certain gap between each layer. This layered design can reduce the spring constant of the displacement direction of the deformed part of the optical axis 100, and reduce the power consumption required during automatic focusing.

[0111] Further, the bending portion 3c can be composed of at least one piece of elastic material on one or more planes; the movable part 3a in the image circuit board 3 can also be composed of a plurality of wire-shaped elastic materials; the controller can be located in the fixed structure in the application or externally.

[0112] Embodiment 2:

[0113] Referring to Figure 10 As shown in Fig. 17, the preferred embodiment 2 of the application provides a camera focusing module on the basis of embodiment 1, which comprises a shell 1, a lens 2, an image circuit board 3, an image chip 4, a driving assembly 5, a position detection assembly 6 and a controller. The shell 1 is provided with a movable channel along the extension direction of the optical axis 100. The lens 2 is installed on the shell 1, and the lens 2 is located at one end of the movable channel. The image circuit board 3 has a movable part 3a and an immovable part 3b, and the immovable part 3b is connected with the shell 1. The image chip 4 is installed on the movable part 3a, and the image chip 4 is located in the movable channel. The driving assembly 5 is connected with the movable part 3a, and is used to drive the image chip 4 to move in the movable channel along the optical axis 100. The controller is connected with the image circuit board 3.

[0114] The position detection assembly 6 comprises two first position sensors 6a and a first position magnet 6b. The two first position sensors 6a are installed on the movable part 3a in sequence along the extension direction of the optical axis 100. The first position magnet 6b is installed on the shell 1, and the first position magnet 6b is arranged correspondingly to the first position sensor 6a. The first position magnet 6b comprises at least three magnetic pole groups, and the at least three magnetic pole groups are stacked in sequence along the direction of the optical axis 100. The adjacent magnetic pole groups face the magnetic poles of the position sensor in opposite directions.

[0115] Specifically, during focusing, the movable part 3a of the image circuit board 3 is driven by the driving assembly 5, and then the image chip 4 is driven to move along the active channel, so that the relative distance between the image chip 4 and the lens 2 is changed, the focusing is realized, and the two first position sensors 6a can move along the extension direction of the optical axis 100 with the movable part 3a. Due to the first position magnet 6b, the magnetic field intensity sensed by the two first position sensors 6a changes with the movement, and then the position of the image chip 4 is determined, so that the accurate control of the image chip 4 is facilitated. Moreover, the multi-pole first position magnet 6b and the two first position sensors 6a are adopted, the reading of the first position sensor 6a changes greatly, the accurate positioning of the image chip 4 is facilitated, and then the accurate control is realized; meanwhile, the two first position sensors 6a are arranged, and the further positioning can be realized through the two greatly changed readings, and the accuracy is further improved.

[0116] The side of the first position magnet 6b facing the first position sensor 6a is arranged as a multi-pole structure, so that the reading of the first position sensor 6a changes periodically. When the number of magnetic poles is sufficient or the range exceeds a certain range, the reading of the first position sensor 6a is the same at two different positions of the image chip 4, which will lead to inaccurate reading and inaccurate focusing. Therefore, on the camera focusing module with large stroke, the movable part 3a needs to be pushed to the lowest or highest position of the active channel for initial correction, but this will greatly prolong the focusing time and affect the focusing efficiency.

[0117] On the camera focusing module with large stroke focusing demand, the side of the first position magnet 6b facing the first position sensor has a plurality of magnets, that is, the first position sensor 6a has a plurality of same readings. Therefore, in some preferred examples of the embodiment of the application, the position detection assembly 6 further comprises a second position sensor 6c and a second position magnet 6d. The second position sensor 6c is mounted on the movable part 3a, the second position magnet 6d is mounted on the housing 1, and the second position sensor 6c and the second position magnet 6d are arranged correspondingly. The reading of the second position sensor 6c is a unique determination value, which can roughly determine the position range of the image chip 4. Within the position range, the readings of the two first position sensors 6a are also unique, that is, the position of the image chip 4 can be accurately determined, and the image chip 4 is accurately moved by using the advantage of large reading change of the first position sensor 6a, so that the problem of large stroke focusing is solved.

[0118] It should be noted that the first position sensor 6a and the second position sensor 6c are located on the same side wall of the chip seat 10 or the coil seat 16. The first position magnet 6b and the second position magnet 6d are located on the same side wall of the housing 1 or the magnet seat 12.

[0119] Referring to Figure 15As shown, in some preferred embodiments of the present application, the side of the second position magnet 6d facing the second position sensor 6c is a single magnetic pole and is arranged to be inclined along the direction of the optical axis 100. In this way, because the second position magnet 6d has a smaller thickness at the higher position and the horizontal distance to the second position sensor 6c is farther, the reading of the second position sensor 6c at the higher position is smaller; similarly, because the second position magnet 6d has a larger thickness at the lower position and the horizontal distance to the second position sensor 6c is closer, the reading of the second position sensor 6c at the lower position is larger; by reading the second position magnet 6d with the second position sensor 6c, the approximate position of the image chip 4 can be obtained when the module is started to focus, and it is not necessary to push the movable part 3a to the highest or lowest position for correction, effectively reducing the starting time and improving the focusing efficiency.

[0120] Referring to Figure 16 As shown, in some preferred embodiments of the present application, the second position magnet 6d includes two magnetic pole groups, which are stacked in sequence along the direction of the optical axis 100, and the magnetic poles facing the second position sensor 6c of adjacent magnetic pole groups are opposite. When the image chip 4 moves to the higher position of the movable channel, the reading of the second position sensor 6c is a relatively large positive number; when the image chip 4 moves to the lower position of the movable channel, the reading of the second position sensor 6c is a relatively small negative number; when the image chip 4 gradually rises along the optical axis 100, the reading of the second position sensor 6c also rises to a positive number, which can also reduce the module starting time and improve the focusing efficiency.

[0121] In some preferred embodiments of the present application, the photographing module further includes a lens seat 7, which is mounted at one end of the movable channel, and the lens seat 7 is provided with a mounting hole coaxial with the movable channel; the lens 2 is mounted in the mounting hole. In this way, the lens seat 7 can facilitate the installation and removal of the lens 2, and facilitate the assembly of the camera focusing module.

[0122] Further, the shell 1 has a heat dissipation plate extending into the movable channel along the direction of the optical axis 100 near the end close to the lens 2.

[0123] The existing camera focusing module often needs to focus and shoot at a high frequency, and in the case of long-term use, the camera focusing module will heat up, causing the inside to be in a high temperature state, which is not conducive to the operation of the internal components of the shell 1, referring to Figure 10As shown in Figure 13, in some preferred embodiments of the present invention, the camera focusing module further includes a heat sink 8. The heat sink 8 is provided with a support tube 8a coaxial with the movable channel. The heat sink 8 covers the housing 1, and the support tube 8a is inserted into the movable channel. The lens mount 7 is installed on the support tube 8a. In this way, the heat of the gas inside the housing 1 can be transferred to the heat sink 8 through the support tube 8a. The heat sink 8 transfers the heat to the heat dissipation plate of the housing 1, playing a role in heat conduction. The housing 1 dissipates the heat to the outside, completing heat dissipation and ensuring the reliability of the internal operation of the housing 1.

[0124] The camera focusing module performs high-frequency focusing and shooting, which puts the greatest stress on the image chip 4. Under high-intensity operation, the image chip 4 generates a lot of heat, affecting the subsequent focusing effect; see also Figure 10 As shown in Figure 13, in some preferred embodiments of the present invention, the camera focusing module further includes a heat sink 9 coaxial with the movable channel. One end of the heat sink 9 is connected to the image circuit board 3, and the other end of the heat sink 9 is sleeved on the outside of the image chip 4. In this way, the heat sink 9 and the heat-conducting structure on the image circuit board 3 are connected, which can effectively transfer the heat from the image chip 4 located on the movable part to the heat sink 9 via heat conduction, and then to the housing 1 via heat radiation and heat convection, effectively reducing the temperature and noise of the image chip 4.

[0125] In addition, the image chip 4 can also transfer heat to the movable part 3a via heat conduction, and the movable part 3a then transfers the heat to the bending part 3c, and then to the bottom cover 15 via heat radiation and heat convection. Since the bending part 3c adopts a folded design, it will induce airflow during the autofocus process, improve the effect of heat convection, and further reduce the temperature and noise of the image chip 4.

[0126] Further, see Figure 11 As shown, the other end of the heat sink 9 is fitted onto one end of the support tube 8a. In this way, the heat sink 9 and the support tube 8a are staggered, which effectively prevents dust from entering the heat sink 9 and the image chip 4 from the outside of the heat sink 8, reducing the chance of dust contaminating the image chip 4 and affecting image clarity.

[0127] Furthermore, some parts of the housing 1, heat sink 8, and heat pipe 9 are coated with a dark color to improve the efficiency of absorbing heat radiation and further reduce the temperature and noise of the image chip 4.

[0128] See Figure 10 and Figure 13As shown, in some preferred examples of the embodiment of the present application, the camera focusing module further comprises a magnet seat 12, which is arranged on the inner wall of the shell 1. The magnet seat 12 has a first side wall and a second side wall adjacent to the first side wall. The first side wall is provided with a butt joint hole matched with the driving magnet 5a, and the first position magnet 6b is arranged on the second side wall. Specifically, the first side wall and the second side wall are arranged adjacently to avoid the driving magnet 5a and the first position magnet 6b being arranged on the same side wall, so as to avoid the magnetic interaction between the two magnets affecting the force of the coil and ensure the accuracy of focusing. Meanwhile, the first side wall is provided with the butt joint hole, so that the driving magnet 5a can be conveniently embedded in the butt joint hole, thereby reducing the occupied space and the volume of the camera focusing module.

[0129] As shown in Figure 13 and Figure 14 As shown, in some preferred examples of the embodiment of the present application, the chip seat 10 has a repulsion side wall facing the driving magnet 5a, and the repulsion side wall is provided with a repulsion magnet 14 corresponding to the driving magnet 5a. In this way, the repulsion magnet 14 and the driving magnet 5a repel each other, and the repulsive force tightly presses the chip seat 10 or the coil seat 16 to the ball 13, thereby improving the reliability of the camera focusing module. The repulsion magnet 14 is provided with two repulsion magnets, which are respectively arranged one-to-one corresponding to the two driving magnets 5a.

[0130] As shown in Figure 17 As shown, the chip seat 10 is provided with the coil seat 16, and the coil is arranged on the outer wall of each coil seat 16 along the circumferential direction of the optical axis 100. The coil seat 16 can facilitate the installation of the coil.

[0131] Further, the coil seat 16 is provided with at least two bosses 16a, and the two ends of the coil are fixed on the two bosses 16a one by one and electrically connected with the sensor circuit board 11. The boss 16a can facilitate the fixation of the coil end and the connection of the coil end with the sensor circuit board 11, thereby ensuring the stability of the connection and the neatness of the internal wiring.

[0132] Further, the shell 1, the bottom cover 15 and the magnet seat 12 are composed of a magnetically conductive material, which can reduce the influence of external magnets on the camera focusing module and reduce magnetic interference. In addition, the use of the magnetically conductive material also facilitates the assembly of the magnets, improves the assembly efficiency and precision. Finally, the use of the magnetically conductive material can strengthen the magnetic field strength flowing through the coil and reduce the power consumption of the camera focusing module.

[0133] Embodiment 3:

[0134] As shown in Figure 18 As shown, the preferred embodiment 3 of the present application provides a camera focusing method based on the embodiment 1 or 2, which comprises the following steps:

[0135] S1, the controller obtains the target focal length of the photographic object;

[0136] S2, according to the target focal length, the controller determines the target position information of the image chip 4 in the active channel;

[0137] S3, one of the first position sensors 6a acquires the first position information of the image chip 4 in the active channel; the other first position sensor 6a acquires the second position information of the image chip 4 in the active channel;

[0138] S4, the controller determines the real-time position information of the image chip 4 according to the first position information and the second position information;

[0139] S5, the controller confirms whether the real-time position information matches the target position information, if matched, the controller responds to the user's photography instruction and performs photography using the target focal length; if not matched, the controller proceeds to the next step;

[0140] S6, the controller determines the active stroke and the active direction of the image chip 4 in the active channel according to the first real-time position information and the target position information, and sends an electrical signal to the driving assembly 5;

[0141] S7, the driving assembly 5 drives the image chip 4 to move along the optical axis 100;

[0142] S8, repeat steps S3-S5.

[0143] Further, referring to Figure 19 As shown in the figure, the value A of the first position information and the value B of the second position information change periodically with the movement of the image chip 4 in the active channel, and the changes of A and B satisfy:

[0144] A=Nsinα;

[0145] B=Nsin(α+π / 2);

[0146] Wherein, N is a non-zero real number, and α can be a non-zero angle.

[0147] In some preferred examples of the embodiment of the application, the active channel is divided into a plurality of subintervals corresponding to A and B, the controller determines the subinterval of the image chip 4 at a certain moment according to A and B at the moment, and determines the real-time position information of the image chip 4 according to the subinterval.

[0148] Specifically, each subinterval corresponds to a value A and a value B, when the first position sensor 6a moves to a certain subinterval with the image chip 4, the reading A and B of the two first position sensors 6a at this time can determine the position of the subinterval in the active channel, that is, the real-time position information of the image chip 4.

[0149] Further, referring to Figure 19As shown, the side of the first position magnet 6b facing the first position sensor 6a is configured as a multi-pole structure, so the reading of the first position sensor 6a changes periodically. When the camera focusing module faces some large stroke focusing requirements, the reading of the first position sensor 6a is the same in two different sub-intervals of the image chip 4, which will result in inaccurate reading and inaccurate focusing. Therefore, before step S2, a step S11 is added for the camera focusing module facing large stroke:

[0150] S11, the controller sends an electrical signal to the driving assembly 5, and the driving assembly 5 drives the image chip 4 to move to the lowest or highest position of the active channel for initial correction.

[0151] Although the camera focusing module can meet the large stroke focusing requirements through S11, this will greatly reduce the focusing efficiency. Therefore, in some preferred embodiments of the present application, the position detection assembly 6 further comprises a second position sensor 6c and a second position magnet 6d, the second position sensor 6c is installed on the movable part 3a, the second position magnet 6d is installed on the housing 1, and the second position sensor 6c and the second position magnet 6d are correspondingly arranged; wherein,

[0152] The second position sensor 6c acquires third position information of the image chip 4 in the active channel;

[0153] The controller determines the real-time position information of the image chip 4 according to the first position information, the second position information and the third position information.

[0154] Specifically, the third position information determined by the second position sensor 6c is a unique determination value, which can roughly determine the position range of the image chip 4. In the position range, the readings of the two first position sensors 6a are also unique, that is, the position of the image chip 4 can be accurately determined, and the image chip 4 is accurately moved by using the advantage of large reading change of the first position sensor 6a, thereby solving the problem of large stroke focusing.

[0155] Referring to Figure 20 and Figure 21 As shown, the value C of the third position information monotonically changes with the movement of the image chip 4 in the active channel. Specifically, the reading of the third position sensor continuously increases as the image chip 4 moves from the bottom to the top of the active channel. Of course, it can also be configured in a gradually decreasing mode, as long as the reading of the third position sensor is unique.

[0156] The preferred embodiment of the present application also provides a terminal device, which comprises a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, and the processor implements the focusing method according to any one of the above when executing the computer program. The specific implementation manner can be referred to the method embodiment, which will not be described here.

[0157] The preferred embodiments of the present application also provide a computer readable storage medium comprising a stored computer program, wherein the computer readable storage medium controls the device where the computer readable storage medium is located to execute the focusing method according to any one of the above embodiments when the computer program is running. For details, refer to the method embodiments, which will not be repeated here.

[0158] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

[0159] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented by other manners. The foregoing device embodiments are merely schematic, for example, the division of the units is only a logical function division, and another division manner can be used in actual implementation, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some communication interfaces, devices or units, which can be electrical, mechanical or other forms.

[0160] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. According to actual needs, part or all of the units can be selected to achieve the purpose of the present embodiment.

[0161] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit.

[0162] If the functions are realized in the form of software function units and sold or used as independent products, they can be stored in a nonvolatile computer readable storage medium executable by a processor. Based on this understanding, the technical solutions of the present application essentially or the parts of the prior art that make contributions or parts of the technical solutions can be embodied in the form of software products. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0163] Finally, it should be noted that: the above-described embodiments are merely specific embodiments of the present application, which are used to illustrate the technical solutions of the present application, but not to limit them. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can make modifications or easily think of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed by the present application, or make equivalent replacements to some of the technical features. The modifications, changes or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A camera focusing module, characterized in that, The application relates to a camera focusing module. The camera focusing module comprises a shell, a lens, an image circuit board, an image chip, a driving assembly, a position detection assembly and a controller. The shell is provided with a movable channel along the direction of the optical axis. The lens is mounted on the shell and located at one end of the movable channel. The image circuit board has a movable part and an immovable part, and the immovable part is connected with the shell. The image chip is mounted on the movable part and located in the movable channel. The driving assembly is connected with the movable part and used for driving the image chip to move in the movable channel along the direction of the optical axis. The position detection assembly comprises two first position sensors and a first position magnet.

2. The camera focusing module according to claim 1, wherein, The two first position sensors are mounted on the movable part in sequence along the direction of the optical axis.

3. The camera focusing module according to claim 2, wherein, The first position magnet is mounted on the shell and arranged correspondingly with the first position sensor.

4. The camera focusing module of claim 2, wherein, The first position magnet comprises at least three magnetic pole groups.

5. The camera focusing module of claim 1, wherein, The at least three magnetic pole groups are stacked in sequence along the direction of the optical axis.

6. The camera focusing module according to claim 5, wherein, The magnetic poles of adjacent magnetic pole groups face each other in opposite directions.

7. The camera focusing module according to claim 6, wherein, The controller is connected with the image circuit board.

8. The camera focusing module according to claim 7, wherein, The position detection assembly further comprises a second position sensor and a second position magnet.

9. The camera focusing module according to claim 1, wherein, The second position sensor is mounted on the movable part.

10. The camera focusing module according to claim 9, wherein, The second position magnet is mounted on the shell and arranged correspondingly with the second position sensor. The side of the second position magnet facing the second position sensor is a single magnetic pole and is arranged obliquely along the direction of the optical axis. The second position magnet comprises two magnetic pole groups. The two magnetic pole groups are stacked in sequence along the direction of the optical axis. The magnetic poles of adjacent magnetic pole groups face each other in opposite directions. The camera focusing module further comprises a lens seat. The lens seat is mounted on one end of the movable channel. The lens seat is provided with a mounting hole coaxial with the movable channel. The lens is mounted on the mounting hole. The camera focusing module further comprises a heat dissipation seat. The heat dissipation seat is provided with a supporting pipe coaxial with the movable channel. The heat dissipation seat covers the shell, and the supporting pipe is inserted into the movable channel. The lens seat is mounted on the supporting pipe. The camera focusing module further comprises a heat dissipation pipe coaxial with the movable channel. One end of the heat dissipation pipe is connected with the image circuit board. The other end of the heat dissipation pipe is sleeved on one end of the supporting pipe. The camera focusing module further comprises a chip seat. One end of the chip seat is connected with the movable part. The chip seat is located in the movable channel. One end of the chip seat is sleeved on the outside of the image chip. The camera focusing module further comprises a sensor circuit board. The sensor circuit board is arranged along the side wall of the chip seat. One end of the sensor circuit board is connected with the movable part. The other end of the sensor circuit board is connected with the chip seat. The first position sensor is mounted on the sensor circuit board.

11. The camera focusing module according to claim 9, wherein, The driving assembly comprises a driving magnet and a driving coil, the driving magnet is installed on the shell, the driving coil is installed on the chip seat, and the driving coil is electrically connected with the image circuit board.

12. The camera focusing module according to claim 11, wherein, The driving coil is wound on the chip seat along the circumferential direction of the optical axis.

13. The camera focusing module of claim 11, wherein, The camera focusing module further comprises a magnet seat, the magnet seat is arranged on the inner wall of the shell, the magnet seat has a first side wall and a second side wall adjacent to the first side wall; the first side wall is provided with a butt joint hole matched with the driving magnet, and the first position magnet is installed on the second side wall.

14. The camera focusing module of claim 11, wherein, The driving coil has a first reference surface, the first reference surface is perpendicular to the optical axis, and the first reference surface is flush with the bottom surface of the driving coil; the positional relationship between the driving coil and the first position sensor satisfies: |50%L1-L2|<20%L1; Wherein, L1 is the minimum distance between the top end of the driving coil and the first reference surface, and L2 is the minimum distance between the center of the first position sensor and the first reference surface.

15. The camera focusing module of claim 11, wherein, The image circuit board is provided with a relay, and the relay is electrically connected with the driving coil; Wherein, when the driving coil is powered off, the two ends of the driving coil can be conducted through the relay. 16.The camera focusing module of claim 11, wherein, The chip seat has a butt joint side wall, both sides of the butt joint side wall are provided with sliding grooves extending along the extension direction of the optical axis, and a plurality of rolling balls are arranged in the sliding grooves and stacked in sequence along the extension direction of the optical axis; the chip seat slides relative to the shell through the rolling balls.

17. The camera focusing module of claim 16, wherein, The image circuit board has a second reference surface, the second reference surface is perpendicular to the extension direction of the optical axis, and the second reference surface is flush with the top surface of the image circuit board, part of the rolling balls are located above the second reference surface, and part of the rolling balls are located below the second reference surface. 18.The camera focusing module of claim 16, wherein, The chip seat has a repulsion side wall facing the driving magnet, and the repulsion side wall is provided with a repulsion magnet corresponding to the driving magnet.

19. The camera focusing module of claim 1, wherein, The camera focusing module further comprises a bottom cover, the bottom cover is buckled on the bottom end of the shell, and the side wall of the bottom cover is provided with a through hole for the image circuit board to extend out. 20.The camera focusing module according to claim 1, wherein, The image circuit board further comprises a plurality of bending parts, the bending parts are connected in sequence along the extension direction of the optical axis, the bending part at the top end is connected with the movable part, and the bending part at the bottom end is connected with the immovable part.

21. A method of focusing an image of a focusing module according to any one of claims 1 to 20, characterized in that The steps comprise: acquiring the target focal length of the photographed object; determining the target position information of the image chip according to the target focal length; One of the first position sensors acquires the first position information of the image chip, and the other first position sensor acquires the second position information of the image chip; determining the real-time position information of the image chip according to the first position information and the second position information; determining whether the real-time position information matches the target position information, if they match, responding to the user's photography instruction and performing photography using the target focal length; if they do not match, the next step is performed; According to the real-time position information and the target position information, an active stroke and an active direction of the image chip are determined, and a driving electrical signal is sent; The above steps are repeated.

22. The image pickup focusing method according to claim 21, characterized by, The values A and B of the first and second position information change periodically with the activity of the image chip, and the changes of A and B satisfy: A = N sin α; B = N sin (α + π / 2); Wherein, N is a non-zero real number.

23. The camera focusing method of claim 22, wherein, The active track of the image chip is divided into a plurality of subintervals corresponding to A and B, and the controller determines the subinterval of the image chip at a certain moment according to A and B at the moment, and determines the real-time position information of the image chip according to the subinterval.

24. The image pickup focusing method according to claim 21, characterized by, The real-time position information of the image chip further includes the following steps: Obtaining third position information of the image chip; According to the first position information, the second position information and the third position information, the real-time position information of the image chip is determined.

25. The image pickup focusing method according to claim 24, wherein The value C of the third position information changes monotonically with the activity of the image chip.

26. A terminal device, comprising: The computer readable storage medium includes a computer program stored therein, wherein when the computer program runs, the device where the computer readable storage medium is located executes the image focusing method according to any one of claims 21-25.

27. A computer readable storage medium, characterized in that, The computer readable storage medium includes a computer program stored therein, wherein when the computer program runs, the device where the computer readable storage medium is located executes the image focusing method according to any one of claims 21-25.

Images