Camera module and electronic equipment

Abstract

The embodiment of the invention provides a camera module and electronic equipment. The camera module at least comprises an imaging unit and a position detection unit. The imaging unit includes a moving member that moves in a first direction. The position detection unit comprises two movable pieces and two sets of fixed units. And the two movable pieces are fixedly installed at the two opposite ends of the moving part respectively and located between the two sets of fixing units, the two movable pieces are arranged at intervals in the second direction, each set of fixing units comprises at least one fixing piece, and the two sets of fixing units are oppositely arranged in the second direction. One of the movable piece and the fixed piece is a magnet, and the other of the movable piece and the fixed piece is a magnetic sensor. The magnetic sensor is used for detecting the magnetic field intensity of the magnet corresponding to the magnetic sensor. By arranging the magnetic sensor and the magnet which are matched with each other on the two sides of the moving part, the precision error caused by the change of the distance between the magnet and the magnetic sensor can be compensated, and the position detection precision can be improved.

Description

Camera modules and electronic equipment

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on June 28, 2022, with application number 202210740020.7 and application name “Camera module and electronic device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to the field of terminal technology, and in particular to a camera module and electronic equipment. Background Art

[0003] In camera modules, in order to compensate for the effects of vibration and implement automatic zoom, sensors with high-precision position detection capabilities are required for position feedback.

[0004] In related art, camera modules utilize a sensing magnet and multiple Hall sensors to achieve position detection. The sensing magnet is mounted on the camera module's moving component, and multiple Hall sensors are arranged at equal intervals along the direction of the magnet's motion and facing the magnet. The multiple magnetic field signals detected by the Hall sensors can be used to determine whether the moving component is at a predetermined position.

[0005] However, the position detection accuracy of the moving parts of the camera module in the related art is low.

[0006] Summary of the Invention

[0007] The embodiments of the present application provide a camera module and an electronic device, which can compensate for the accuracy error caused by the dynamic change of the distance between the magnet and the magnetic sensor, and can improve the position detection accuracy of the moving parts of the camera module.

[0008] According to a first aspect of the present application, a camera module is provided, which comprises at least an imaging unit and a position detection unit. The imaging unit comprises a moving component that moves along a first direction. The position detection unit comprises two movable parts and two groups of fixed units. The two movable parts are respectively fastened to opposite ends of the moving component and are located between the two groups of fixed units, and the two movable parts are spaced apart along a second direction. The second direction is perpendicular to the first direction. Each group of fixed units comprises at least one fixed part, and the two groups of fixed units are arranged relative to each other along the second direction. When each group of fixed units comprises a plurality of fixed parts, the plurality of fixed parts of each group of fixed units are spaced apart along the first direction. One of the movable part and the fixed part is a magnet, and the other of the movable part and the fixed part is a magnetic sensor. The magnetic sensor is used to detect the magnetic field strength of the magnet corresponding to the magnetic sensor.

[0009] In the camera module provided by the embodiment of the present application, since one of the fixed part and the movable part is a magnet and the other is a magnetic sensor, taking the movable part as a magnet and the fixed part as a magnetic sensor as an example, when the moving part of the embodiment of the present application moves along the second direction, the distance between the moving part and one group of fixed units increases, and the distance between the moving part and the other group of fixed units decreases. Correspondingly, the magnetic field strength detected by one group of fixed units becomes smaller, and the magnetic field strength detected by the other group of fixed units becomes larger. By adding or subtracting the magnetic field strengths detected by the two groups of fixed units, the accuracy error caused by the change in the distance between the magnet and the magnetic sensor can be compensated, and the position detection accuracy of the moving part can be improved.

[0010] In a possible implementation manner, the movable part is a magnetic sensor, and the fixed part is a magnet.

[0011] In a possible implementation manner, the movable part is a magnet, and the fixed part is a magnetic sensor.

[0012] In a possible implementation manner, each group of the fixing units includes the same number of the fixing elements.

[0013] In a possible implementation, each group of the fixing units includes one fixing member, two fixing members, or three fixing members.

[0014] In a possible implementation, all the fixing members of the fixing units in one group correspond one-to-one to all the fixing members of the fixing units in another group.

[0015] In a possible implementation, the two groups of fixing units have different numbers of fixing elements.

[0016] In a possible implementation, the difference between the number of the fixing elements in one of the two groups of fixing units and the number of the fixing elements in the other group of fixing units is 1, 2, or 3.

[0017] In a possible implementation, one of the groups of fixing units includes one fixing member, and the other group of fixing units includes two or three fixing members.

[0018] In a possible implementation, when the other group of fixing units includes two fixing members, the fixing member of one group of fixing units is located in the middle of the two fixing members of the other group of fixing units.

[0019] In a possible embodiment, when the other group of fixing units includes three fixing parts, the fixing parts of one group of fixing units are arranged opposite to the fixing parts in the middle of the three fixing parts of the other group of fixing units along the second direction.

[0020] In a possible implementation, the two magnets are arranged to attract each other along the second direction, or the two magnets are arranged to repel each other along the second direction.

[0021] In a possible implementation, the magnetic sensor is any one of the following sensors: a Hall sensor, a giant magnetoresistive sensor, a tunneling magnetoresistive sensor, an anisotropic magnetoresistive sensor, or an integrated sensor signal processing chip.

[0022] In one possible embodiment, the moving component is a lens assembly or a photosensitive chip. The lens assembly includes at least one lens that moves along a first direction. When the moving component is the lens assembly, the lens assembly includes at least one lens that moves along the first direction, and the two movable members are fastened to the same lens.

[0023] In one possible embodiment, the device further includes a control unit. Each of the magnetic sensors is electrically connected to the control unit. The control unit is configured to receive a magnetic field signal transmitted by each of the magnetic sensors and determine the position of the moving component based on all of the magnetic field signals.

[0024] In one possible embodiment, the invention further includes a driving unit. The driving unit is electrically connected to the control unit and is in driving connection with the moving component. The control unit is further configured to control the driving unit to drive the moving component to move in the first direction according to the magnetic field signal.

[0025] In a possible implementation manner, each of the magnetic sensors is individually electrically connected to the control unit.

[0026] In a possible implementation manner, all the magnetic sensors of each group of the fixing units are electrically connected to the same connection terminal of the control unit.

[0027] In a possible implementation manner, the magnet is a magnetite or a magnet.

[0028] A second aspect of the present application provides an electronic device, comprising a housing and a camera module as described above, wherein the camera module is disposed on the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG1 is a schematic structural diagram of a camera module in the related art;

[0030] FIG2 is a schematic diagram of the relative distance between the induction magnet and the Hall sensor in the related art;

[0031] FIG3 is a schematic diagram of various units of a camera module provided in an embodiment of the present application;

[0032] FIG4 is a schematic diagram of an application scenario of a camera module provided in an embodiment of the present application;

[0033] FIG5 is a schematic structural diagram of a camera module provided in an embodiment of the present application;

[0034] FIG6 is a schematic diagram of a magnet provided by an embodiment of the present application shifting rightward in a second direction;

[0035] FIG7 is a schematic diagram showing the case where the sensing directions of the magnetic sensors on both sides of the moving component provided by an embodiment of the present application are the same;

[0036] FIG8 is a schematic diagram showing a case where the sensing directions of the magnetic sensors on both sides of the moving component are opposite to each other according to an embodiment of the present application;

[0037] FIG9 is a schematic diagram of the detection effect of the embodiment shown in FIG6;

[0038] FIG10 is a schematic diagram of the detection effect of the camera module in the related art;

[0039] FIG11 is a schematic structural diagram of a first position detection unit provided in an embodiment of the present application;

[0040] FIG12 is a schematic structural diagram of a second position detection unit provided in an embodiment of the present application;

[0041] FIG13 is a schematic structural diagram of a third position detection unit provided in an embodiment of the present application;

[0042] FIG14 is a schematic structural diagram of a fourth position detection unit provided in an embodiment of the present application;

[0043] FIG15 is a schematic structural diagram of a fifth position detection unit provided in an embodiment of the present application;

[0044] FIG16 is a schematic structural diagram of a sixth position detection unit provided in an embodiment of the present application;

[0045] FIG17 is a schematic structural diagram of a seventh position detection unit provided in an embodiment of the present application;

[0046] FIG18 is a schematic structural diagram of an eighth position detection unit provided in an embodiment of the present application;

[0047] FIG19 is a schematic diagram of an arrangement of two magnets attracting each other provided in an embodiment of the present application;

[0048] FIG20 is another schematic diagram of an arrangement of two magnets attracting each other provided in an embodiment of the present application;

[0049] FIG21 is a schematic diagram of a repulsive arrangement of two magnets provided in an embodiment of the present application;

[0050] FIG22 is another schematic diagram of two magnets repelling each other provided in an embodiment of the present application;

[0051] FIG23 is a schematic diagram of the cooperation between a magnet and a magnetic sensor provided in an embodiment of the present application;

[0052] FIG24 is another schematic diagram of the cooperation between a magnet and a magnetic sensor provided in an embodiment of the present application;

[0053] FIG25 is another schematic diagram of the cooperation between a magnet and a magnetic sensor provided in an embodiment of the present application;

[0054] FIG26 is a schematic diagram showing a connection between a magnetic sensor and a control unit according to an embodiment of the present application;

[0055] FIG27 is another schematic diagram of the connection between the magnetic sensor and the control unit provided in an embodiment of the present application;

[0056] FIG28 is another connection diagram of the magnetic sensor and the control unit provided in an embodiment of the present application.

[0057] Explanation of the accompanying symbols: 10, camera module; 100, imaging unit; 110, moving part; 120, lens group; 130, photosensitive chip; 200, position detection unit; 210, movable part; 220, fixing unit; 221, fixing part; 230, magnet; 240, magnetic sensor; 300, control unit; 400, driving unit; 500, amplifier; 600, analog-to-digital converter; 20, light source; 710, Hall sensor; 720, induction magnet; 730, moving part; 740, processor; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0058] As the functions of electronic devices become increasingly powerful, they generally include a camera module 10. The camera module 10 can capture and collect external images, thereby enabling the electronic device to achieve functions such as shooting or video calls. The electronic device may be a common terminal such as a mobile phone, a tablet computer, a laptop computer, or a personal digital assistant (PDA). When taking photos, in order to improve the shooting quality of the camera module 10, the camera modules 10 of more and more electronic devices are equipped with an anti-shake function and an automatic zoom function. Both the anti-shake function and the automatic zoom function require the use of a sensor with a high-precision position detection function for position feedback.

[0059] FIG1 is a schematic diagram of the structure of a camera module in the related art, and FIG2 is a schematic diagram of the relative distance between an inductive magnet and a Hall sensor in the related art.

[0060] 1 and 2 , the camera module 10 in the related art uses a single sensing magnet 720 and multiple Hall sensors 710 to cooperate with each other to detect the position of a moving part 730 of the camera module 10. The moving part 730 can be a moving lens of the camera module 10, and a zoom function can be achieved by moving the moving lens. The sensing magnet 720 is fastened to the moving part 730, and the moving part 730 can drive the sensing magnet 720 to move along the X direction in FIG1 . Multiple Hall sensors 710 are arranged at intervals along the direction of movement of the sensing magnet 720 (refer to the X direction in FIG1 ) and facing the sensing magnet 720. The multiple Hall sensors 710 remain stationary relative to the sensing magnet 720. The multiple Hall sensors 710 transmit the detected magnetic field strength to the processor 740 of the camera module 10. The processor 740 determines the current position of the moving part 730 based on the received magnetic field strength. However, when the relative distance between the inductive magnet 720 and the Hall sensor 710 (e.g., the spacing in the Y direction in FIG. 1 , or the distance in the Y direction in FIG. 2 ) changes, the magnetic field strength detected by the Hall sensor 710 also changes, resulting in a change in detection accuracy, which reduces the accuracy of position detection. For example, when the relative distance between the Hall sensor 710 and the inductive magnet 720 decreases, when the moving part 730 moves to the predetermined position, the magnetic field strength detected by the Hall sensor 710 increases. The processor 740 adjusts the movement distance of the moving part 730 based on the current magnetic field strength detected by the Hall sensor 710 so that the magnetic field strength detected by the Hall sensor 710 is the same as the magnetic field strength corresponding to the predetermined position. However, this adjustment causes the actual position of the moving part 730 to deviate from the predetermined position. Therefore, when the relative distance between the inductive magnet 720 and the Hall sensor 710 changes, it will cause an accuracy error, and the magnetic field strength detected by the magnetic sensor 240 will be inaccurate, which will reduce the accuracy of position detection.

[0061] Based on this, an embodiment of the present application provides an electronic device, comprising a housing and a camera module 10 disposed on the housing. The shape of the housing may depend on the type of electronic device. For example, if the electronic device is a mobile phone, the housing may be a rectangular flat plate. Furthermore, the camera module 10 may be embedded in a side wall of the housing.

[0062] FIG3 is a schematic diagram of the various units of the camera module provided in an embodiment of the present application, and FIG4 is a schematic diagram of the application scenario of the camera module provided in an embodiment of the present application.

[0063] Referring to Figure 3, in an embodiment of the present application, the camera module 10 includes at least an imaging unit 100, a position detection unit 200, a control unit 300, and a driving unit 400. The imaging unit 100 is used to receive the light emitted by the light source 20 and process the received light to form an image. In some examples, referring to Figure 4, the imaging unit 100 may include at least a lens group 120 and a photosensitive chip 130 stacked along the optical axis. The lens group 120 is used to project the light emitted by the external light source 20 onto the photosensitive chip 130, and the photosensitive chip 130 processes the received light to form an image. In order to realize the automatic zoom function of the camera module 10, the lens group 120 or the photosensitive chip 130 can be moved. Therefore, the lens group 120 can be used as the moving part 110, or the photosensitive chip 130 can be used as the moving part 110. For example, referring to Figure 4, the photosensitive chip 130 can be used as the moving part 110.

[0064] In an embodiment of the present application, the driving unit 400 is electrically connected to the control unit 300 and is driven and connected to the moving part 110, so that the driving unit 400 can move the moving part 110 to the target position. For example, referring to Figure 4, when the moving part 110 is a photosensitive chip 130, the photosensitive chip 130 can be moved from the dotted line position to the solid line position along the X direction in Figure 4 under the action of the driving unit 400 to change the position of the photosensitive chip 130 in the X direction in Figure 4, and the solid line has an automatic zoom function.

[0065] In an embodiment of the present application, the control unit 300 is electrically connected to the position detection unit 200 and the drive unit 400, respectively. The control unit 300 can control the drive unit 400 according to the current position of the moving part 110 detected by the position detection unit 200, thereby ensuring that the moving part 110 can move to the target position to meet usage requirements.

[0066] In an embodiment of the present application, the position detection unit 200 includes a magnet 230 and a magnetic sensor 240. Magnets 230 and magnetic sensors 240 are arranged on opposite sides of the moving part 110. Each magnet 230 cooperates with at least one magnetic sensor 240. When the distance between one magnet 230 and the magnetic sensor 240 corresponding to the magnet 230 becomes larger, the distance between the other magnet 230 and the magnetic sensor 240 corresponding to the magnet 230 becomes smaller, so that the magnetic field strength detected by the magnetic sensor 240 on one side of the moving part 110 increases, and the magnetic field strength detected by the magnetic sensor 240 on the other side decreases. Since the distance between the magnetic sensors 240 on both sides remains unchanged, the magnetic field strength detected by the magnetic sensors 240 on both sides is calculated, which can compensate for the accuracy error caused by the change in the distance between the magnet 230 and the magnetic sensor 240, improve the accuracy of the magnetic field strength detected by the magnetic sensor 240, and improve the position detection accuracy.

[0067] It can be understood that each magnetic sensor 240 is electrically connected to the control unit 300, and each magnetic sensor 240 is used to convert the collected magnetic field strength into a magnetic field signal and upload the magnetic field signal to the control unit 300. The control unit 300 then determines the current position of the moving part 110 based on all the received magnetic field signals.

[0068] It should be noted that the arrangement of the magnetic sensor 240 and the magnet 230 provided in the embodiment of the present application is targeted at the application scenario of the camera module 10, which is used to determine the position of the moving part 110 of the imaging unit 100, thereby realizing the automatic zoom function and compensating for the effect of shaking. Of course, the arrangement of the magnetic sensor 240 and the magnet 230 provided in the embodiment of the present application is not limited to the camera module 10 for application scenarios. For example, the arrangement of the magnetic sensor 240 and the magnet 230 provided in the embodiment of the application can also be applied to industrial machine tools, robots, and other use scenarios that have the function of detecting and feeding back the relative position of the moving part.

[0069] The following describes the implementation of the camera module 10 provided in the embodiment of the present application.

[0070] FIG5 is a schematic structural diagram of a camera module provided in an embodiment of the present application.

[0071] 5 , the camera module 10 of an embodiment of the present application includes at least an imaging unit 100 and a position detection unit 220. The imaging unit 100 is configured to receive light emitted by an external light source 20 and process the received light to form an image. The imaging unit 100 may include a moving component 110 that moves along a first direction (such as the X direction in FIG. 5 ). By changing the position of the moving component 110 in the first direction, an automatic zoom function may be implemented to meet the user's shooting needs. For example, the moving component 110 may be a lens assembly 120 or a photosensitive chip 130 of the imaging unit 100.

[0072] The position detection unit 220 is used to detect the position of the moving component 110 to ensure that the moving component 110 can move to the target position. The position detection unit 220 may include two movable parts 210 and two groups of fixed units 220. The two movable parts 210 are respectively fastened on the opposite ends of the moving component 110, and the movable parts 210 can follow the moving component 110 to move along the first direction. It should be noted that when the moving component 110 is a lens group 120, the lens group 120 may include at least one lens that moves along the first direction, and the two movable parts 210 are fastened on the same lens. The two movable parts 210 are spaced apart along the second direction and are located between the two groups of fixed units 220. Each movable part 210 corresponds to a group of fixed units 220 and is spaced apart from the fixed units 220 in the second direction (such as the Y direction in Figure 5). The second direction is perpendicular to the first direction.

[0073] It can be understood that, during the movement of the moving part 110 along the first direction, the position of the fixed unit 220 relative to the moving part 110 remains unchanged, which can reduce the difficulty of detection. In addition, the fixed unit 220 can be set near the target position. When the moving part 110 moves to the target position, the fixed unit 220 cooperates with the movable part 210 to determine the actual position of the moving part 110. The fixed unit 220 can be set on a non-moving component on the camera module 10, or the fixed unit 220 can be set on a non-moving component on the electronic device. For example, the fixed unit 220 can be set on the housing of the camera module 10, or, when the fixing part 221 of the fixed unit 220 is a sensor, the fixed unit 220 can be set on the printed circuit board of the camera module 10. No specific limitation is made here.

[0074] Each group of fixing units 220 may include at least one fixing member 221, that is, each group of fixing units 220 may include 1, 2, 3, 4, 10, or other number of fixing members 221. When each group of fixing units 220 includes multiple fixing members 221, the multiple fixing members 221 of each group of fixing units 220 are spaced apart along the first direction, and the number of the multiple fixing members 221 can be a positive integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or 16. In addition, the two groups of fixing units 220 are arranged relative to each other along the second direction. Such an arrangement helps to improve the overlap between the magnetic field strength detected by the two groups of fixing units 220 and the magnetic field strength-travel curve formed by fitting the travel data, thereby helping to improve detection accuracy.

[0075] One of the movable part 210 and the fixed part 221 is a magnet 230, and the other of the movable part 210 and the fixed part 221 is a magnetic sensor 240. The magnetic sensor 240 is used to detect the magnetic field strength of the magnet 230 corresponding to the magnetic sensor 240. The magnet 230 can be a magnet, a magnet, or a magnetic field generator capable of generating a magnetic field. It is understood that since the movable part 210 moves with the moving component 110, the position of the fixed part 221 remains unchanged. Therefore, when the magnet 230 is the movable part 210, the magnetic sensor 240 is correspondingly the fixed part 221, and vice versa. When the magnetic sensor 240 is the movable part 210, the magnet 230 is correspondingly the fixed part 221. When the magnet 230 is the movable part 210 and the magnetic sensor 240 is the fixed part 221, it helps to reduce the difficulty of arranging the position detection unit 220 and the difficulty of detection.

[0076] The magnetic sensor 240 detects the magnetic field strength of the magnet 230 and converts it into a magnetic field signal and sends the magnetic field signal to the control unit 300. The control unit 300 can determine whether the moving part 110 has moved to the target position based on the magnetic field signal. The detection principle of the control unit 300 determining the position of the moving part 110 based on the magnetic field signal is as follows: the stroke of the moving part 110 is linearly related to the magnetic field strength, that is, each stroke value of the moving part 110 in the first direction corresponds to a unique judgment magnetic field strength. When the current magnetic field strength detected by the magnetic sensor 240 is equal to the judgment magnetic field strength at the target position, it can be determined that the moving part 110 has moved to the target position. When there is a deviation between the current magnetic field strength detected by the magnetic sensor 240 and the judgment magnetic field strength at the target position, the control unit 300 will control the movement distance of the moving part 110 based on the deviation value between the current magnetic field strength detected by the magnetic sensor 240 and the judgment magnetic field strength at the target position to ensure that the moving part 110 moves to the target position.

[0077] The following describes in detail the principle of how the embodiment of the present application compensates for the accuracy error by taking the movable part 210 as the magnet 230 , the fixed part 221 as the magnetic sensor 240 , and each magnet 230 corresponding to two magnetic sensors 240 as an example:

[0078] Figure 6 is a schematic diagram of the magnet provided in an embodiment of the present application offset to the right in the second direction. As shown in Figure 6, when the two magnets 230 are offset to the right by a certain distance (for example, A in Figure 6) in the second direction, the distance between the magnet 230 on the right side of the moving part 110 (not shown in Figure 6) and the magnetic sensor 240 on the right side in the second direction becomes smaller, so that the magnetic field strength detected by the magnetic sensor 240 on the right side becomes larger, and the distance between the magnet 230 on the left side of the moving part 110 and the magnetic sensor 240 on the left side in the second direction becomes larger, so that the magnetic field strength detected by the magnetic sensor 240 on the left side becomes smaller. Since the spacing between the magnetic sensors 240 on both sides in the second direction remains unchanged, compared with the magnetic field strength detected when it is not offset to the right, the increased portion of the magnetic field strength detected by the magnetic sensor 240 on the right side after the offset is just approximately equal to the decreased portion of the magnetic field strength detected by the magnetic sensor 240 on the left side after the offset. Therefore, by performing corresponding operations on the magnetic field strength detected by the magnetic sensor 240 on the left side and the magnetic field strength detected by the magnetic sensor 240 on the right side, it can be ensured that under the same stroke, the magnetic field magnitude value sensed by the magnetic sensor 240 is basically not affected by the change in the spacing between the magnet 230 and the magnetic sensor 240 corresponding to the magnet 230, which helps to reduce the accuracy error and improve the position detection accuracy.

[0079] Among them, the calculation method (addition or subtraction) of the magnetic field strength detected by the magnetic sensor 240 on the left and the magnetic field strength detected by the magnetic sensor 240 on the right depends on the arrangement of the magnet 230 (attractive setting or repulsive setting) and the sensing direction of the magnetic sensor 240 (for example, the K direction in Figure 7 or Figure 8). The sensing direction of the magnetic sensor 240 is parallel to the second direction. In addition, the orientation of the sensing direction of the magnetic sensor 240 can depend on the installation direction of the magnetic sensor 240.

[0080] Figure 7 is a schematic diagram illustrating an embodiment of the present application in which the sensing directions of the magnetic sensors on both sides of the moving component are the same. As shown in Figure 7, when the two magnets 230 are arranged to attract each other and the sensing directions of the magnetic sensors 240 on both sides of the moving component 110 are the same, the magnetic field strengths on both sides of the moving component 110 are added together. When the two magnets 230 are arranged to repel each other (not shown), and the sensing directions of the magnetic sensors 240 on both sides of the moving component 110 are opposite, the magnetic field strengths on both sides of the moving component 110 are added together.

[0081] FIG8 is a schematic diagram illustrating an embodiment of the present application in which the sensing directions of the magnetic sensors on both sides of the moving component are opposite. As shown in FIG8 , when the two magnets 230 are arranged to attract each other and the sensing directions of the magnetic sensors 240 on both sides of the moving component 110 are opposite, the magnetic field intensities on both sides of the moving component 110 are subtracted. When the two magnets 230 are arranged to repel each other (not shown), and the sensing directions of the magnetic sensors 240 on both sides of the moving component 110 are the same, the magnetic field intensities on both sides of the moving component 110 are subtracted.

[0082] Therefore, when the sensing directions of the magnetic sensors 240 on both sides of the moving component 110 are determined, the calculation method for the magnetic field strength detected by the left magnetic sensor 240 and the magnetic field strength detected by the right magnetic sensor 240 depends on the arrangement of the two magnets 230. For example, when the sensing directions of the magnetic sensors 240 on both sides of the moving component 110 are the same, the two magnets 230 are arranged to attract each other. Accordingly, the magnetic field strengths detected by all magnetic sensors 240 are added together, thereby compensating for the accuracy error caused by the variation in the spacing between the magnets 230 and the magnetic sensors 240, thereby improving the position detection accuracy. When the sensing directions of the magnetic sensors 240 on both sides of the moving component 110 are the same, and the two magnets 230 are arranged to repel each other in the second direction, the magnetic field strengths detected by the magnetic sensors 240 of each group of fixed units 220 are added together, and then the magnetic field strengths detected by the two groups of fixed units 220 are subtracted. This can compensate for the accuracy error caused by the variation in the spacing between the magnets 230 and the magnetic sensors 240, thereby improving the position detection accuracy.

[0083] It should be noted that, in the embodiment of the present application, the calculation method of the magnetic field strength is described by taking the case where the magnetic sensors 240 on both sides of the moving component 110 have the same sensing direction as an example.

[0084] Figure 9 is a schematic diagram of the detection effect of the embodiment shown in Figure 6. In Figure 9, H1, H2, H3, and H4 each represent a magnetic sensor 240 and two magnets 230 arranged in an attractive manner in the second direction. (H1+H2+H3+H4) represents the sum of the two magnets 230 when they are arranged in an attractive manner. In Figure 9, a100 represents a decrease of 100 μm in the second direction between the magnet 230 and the magnetic sensor 240; b100 represents an increase of 100 μm in the second direction between the magnet 230 and the magnetic sensor 240; b150 represents an increase of 150 μm in the second direction between the magnet 230 and the magnetic sensor 240; and c represents an unchanged distance between the magnet 230 and the magnetic sensor 240 in the second direction. As can be seen from Figure 9, when the distance between the magnet 230 and the magnetic sensor 240 in the second direction changes, the magnetic field strength does not change at the same travel distance.

[0085] Figure 10 is a schematic diagram of the detection effect of a camera module in the related art. H1 and H2 in Figure 10 represent the sum of the magnetic field strengths detected by the two Hall sensors 710. As shown in Figure 10, due to the change in the distance between the sensing magnet 720 and the Hall sensor 710, the magnetic field strength detected by the Hall sensor 710 will change (increase or decrease) under the same travel distance.

[0086] Therefore, by comparing Figures 9 and 10, it can be seen that the arrangement of the magnet 230 and the magnetic sensor 240 provided in the embodiment of the present application can compensate for the accuracy error caused by the change in the distance between the magnet 230 and the magnetic sensor 240, can improve the accuracy of the magnetic field strength detected by the magnetic sensor 240, and can improve the position detection accuracy.

[0087] To sum up, the camera module 10 provided in the embodiment of the present application is respectively provided with mutually cooperating magnets 230 and magnetic sensors 240 on the opposite sides of the moving part 110. Since the spacing between the magnetic sensors 240 on both sides in the second direction always remains unchanged, when the moving part 110 is offset along the second direction, the magnetic field intensity detected by the magnetic sensor 240 on one side becomes larger, and the magnetic field intensity detected by the magnetic sensor 240 on the other side becomes smaller. By calculating the magnetic field intensity detected by the magnetic sensors 240 on both sides of the moving part 110, the position detection accuracy can be improved.

[0088] The position detection unit 220 of the embodiment of the present application will be described in detail below, assuming that the movable part 210 is the magnet 230 and the fixed part 221 is the magnetic sensor 240 .

[0089] Figure 11 is a structural schematic diagram of the first position detection unit provided in an embodiment of the present application, Figure 12 is a structural schematic diagram of the second position detection unit provided in an embodiment of the present application, and Figure 13 is a structural schematic diagram of the third position detection unit provided in an embodiment of the present application.

[0090] In some possible implementations, each group of fixing units 220 includes the same number of fixing members 221 . This configuration helps to improve position detection accuracy.

[0091] The number of fixing parts 221 included in each group of fixing units 220 can be determined according to factors such as usage requirements and the internal space of the camera module 10. For example, the number of fixing parts 221 in each group of fixing units 220 can be 1, 2, 3, 4, etc., so that the ratio of the number of fixing parts 221 of the two groups of fixing units 220 is 1:1 (as shown in Figure 9), 2:2 (as shown in Figure 10), 3:3 (as shown in Figure 11), 4:4, 5:5, etc.

[0092] It should be noted that the more magnetic sensors 240 there are, the closer the magnetic field strength-stroke curve (as shown in Figure 9) fitted by the magnetic field strength detected by the magnetic sensor 240 is to a straight line. In other words, the more magnetic sensors 240 there are, the more it helps to improve the linearity. The higher the linearity, the closer the current magnetic field strength detected by the magnetic sensor 240 is to the judged magnetic field strength, which helps to improve the position detection accuracy.

[0093] In some examples, along the first direction, all the fixing members 221 of one group of fixing units 220 correspond one-to-one with all the fixing members 221 of the other group of fixing units 220 (as shown in Figures 11-13), that is, the magnetic sensors 240 on both sides of the moving component 110 are symmetrically arranged. Such an arrangement helps to improve the degree of overlap, so that the magnetic field strength detected by the magnetic sensors 240 and the magnetic field strength-stroke curve formed by fitting the stroke is a single curve, which helps to improve the accuracy of position detection. For example, as shown in Figure 12, each group of fixing units 220 can include two magnetic sensors 240, and the two magnetic sensors 240 of the two groups of fixing units 220 are symmetrically arranged.

[0094] FIG14 is a schematic diagram of the structure of the fourth position detection unit provided in an embodiment of the present application, and FIG15 is a schematic diagram of the structure of the fifth position detection unit provided in an embodiment of the present application.

[0095] In other examples, along the first direction, the magnetic sensors 240 on both sides of the moving part 110 can be staggered along the first direction. For example, as shown in Figure 14, each group of fixed units 220 can include two magnetic sensors 240, and in the first direction, all the magnetic sensors 240 are arranged in sequence at intervals, or, as shown in Figure 15, one of the magnetic sensors 240 of one group of fixed units 220 partially overlaps with another magnetic sensor 240 of another group of fixed units 220.

[0096] Figure 16 is a structural schematic diagram of the sixth position detection unit provided in an embodiment of the present application, Figure 17 is a structural schematic diagram of the seventh position detection unit provided in an embodiment of the present application, and Figure 18 is a structural schematic diagram of the eighth position detection unit provided in an embodiment of the present application.

[0097] In some possible implementations, as shown in Figure 16, the number of fixing parts 221 of the two groups of fixing units 220 is different. In other words, there is a difference between the number of fixing parts 221 of one group of fixing units 220 and the number of fixing parts 221 of the other group of fixing units 220. Such a setting helps to improve the application range of the position detection unit 220 and can improve the position detection accuracy.

[0098] It can be understood that, as shown in Figure 16, with the moving part 110 as the center, the number of all magnetic sensors 240 on the top side of the moving part 110 may be smaller than the number of all magnetic sensors 240 on the bottom side of the moving part 110, or the number of all magnetic sensors 240 on the bottom side of the moving part 110 may be greater than the number of all magnetic sensors 240 on the top side of the moving part 110.

[0099] It should be noted that the difference between the number of fixing members 221 of one group of fixing units 220 and the number of fixing members 221 of another group of fixing units 220 is a positive integer. For example, the difference between the number of fixing members 221 of one group of fixing units 220 and the number of fixing members 221 of another group of fixing units 220 can be 1, 2, 3, etc. For example:

[0100] In some examples, as shown in FIG16 , the number of fixing members 221 in one group of fixing units 220 is 1, and the number of fixing members 221 in another group of fixing units 220 is 2, so that the difference between the fixing members 221 in the two groups of fixing units 220 is 1.

[0101] In other examples, as shown in FIG17 , the number of fixing members 221 in one group of fixing units 220 is 2, and the number of fixing members 221 in another group of fixing units 220 is 3, so that the difference between the fixing members 221 of the two groups of fixing units 220 is 1.

[0102] In some other examples, as shown in FIG18 , the number of fixing members 221 in one group of fixing units 220 is 1, and the number of fixing members 221 in another group of fixing units 220 is 3, so that the difference between the fixing members 221 of the two groups of fixing units 220 is 2.

[0103] In order to ensure the degree of coincidence between the magnetic field strength detected by the two groups of fixed units 220 and the magnetic field strength-stroke curve obtained by fitting the stroke, so that the magnetic field strength-stroke curve is a single curve, all the fixing members 221 of the smaller number of fixed units 220 are arranged at intervals, and all the fixing members 221 of the smaller number of fixed units 220 are located in the middle of all the fixing members 221 of the larger number of fixed units 220 in the first direction, so that the two groups of fixed units 220 are symmetrically arranged on opposite sides of the moving component 110. For example:

[0104] In some examples, as shown in FIG16 , one group of fixed units 220 includes one magnetic sensor 240 and another group of fixed units 220 includes two magnetic sensors 240 , wherein the magnetic sensor 240 of one group of fixed units 220 is located in the middle of the two magnetic sensors 240 of the other group of fixed units 220 in the first direction.

[0105] In other examples, as shown in FIG17 , one group of fixed units 220 includes two magnetic sensors 240, and the other group of fixed units 220 includes three magnetic sensors 240, wherein the two magnetic sensors 240 of one group of fixed units 220 and the three magnetic sensors 240 of the other group of fixed units 220 are spaced apart in the first direction, and the two sensors of one group of fixed units 220 are respectively located in the middle of two adjacent magnetic sensors 240 of the other group of fixed units 220.

[0106] In another example, as shown in FIG18 , one group of fixed units 220 includes one magnetic sensor 240, and the other group of fixed units 220 includes three magnetic sensors 240, wherein the magnetic sensors 240 of one group of fixed units 220 are arranged opposite to the magnetic sensors 240 at the middle position of the three magnetic sensors 240 of the other group of fixed units 220 in the second direction.

[0107] In some possible implementations, the magnetic sensor 240 is any one of the following sensors: a Hall sensor 710 , a giant magnetoresistive sensor, a tunneling magnetoresistive sensor, an anisotropic magnetoresistive sensor, or an integrated sensor signal processing chip.

[0108] It should be noted that when each group of fixed units 220 includes multiple magnetic sensors 240, all magnetic sensors 240 in each group of fixed units 220 can be of the same type. Alternatively, each group of fixed units 220 can include at least two types of magnetic sensors 240. For example, each group of fixed units 220 can include a Hall effect sensor 710 and a giant magnetoresistive sensor. Furthermore, the magnetic sensors 240 in two groups of fixed units 220 can also be of the same type. For example, the magnetic sensors 240 in both groups of fixed units 220 can be Hall effect sensors 710.

[0109] It is understandable that all magnetic sensors 240 of the position detection unit 220 can adopt the same type of magnetic sensors 240, which helps to reduce the difficulty of adaptation and assembly of the position detection unit 220 and can reduce manufacturing costs.

[0110] In some possible implementations, the magnet 230 may be a two-pole magnet 230 magnetized with two poles, and the north pole and the south pole of the two-pole magnet 230 are sequentially arranged in the first direction.

[0111] FIG19 is a schematic diagram of an embodiment of the present application showing an arrangement of two magnets attracting each other, and FIG20 is another schematic diagram of an embodiment of the present application showing an arrangement of two magnets attracting each other.

[0112] As shown in Figure 19 or Figure 20, when the two magnets 230 are arranged to attract each other, the N pole of one magnet 230 is arranged opposite to the S pole of the other magnet 230 in the second direction, and the S pole of one magnet 230 is arranged opposite to the N pole of the other magnet 230 in the second direction.

[0113] FIG21 is a schematic diagram of a repulsive arrangement of two magnets provided in an embodiment of the present application, and FIG22 is another schematic diagram of a repulsive arrangement of two magnets provided in an embodiment of the present application.

[0114] As shown in Figure 21 or Figure 22, when the two magnets 230 are set to repel each other, the N pole of one magnet 230 is set opposite to the N pole of the other magnet 230 in the second direction, and the S pole of one magnet 230 is set opposite to the S pole of the other magnet 230 in the second direction.

[0115] Optionally, a neutral zone may be provided between the north pole and the south pole of the magnet 230 . The neutral zone may be provided opposite to the magnetic sensor 240 , or the neutral zone may not be provided opposite to the magnetic sensor 240 .

[0116] To improve detection accuracy, when each magnet 230 corresponds to one magnetic sensor 240, FIG23 is a schematic diagram of a magnet and a magnetic sensor in cooperation according to an embodiment of the present application. As shown in FIG23, the magnetic sensor 240 is located in the middle of the magnet 230 in the first direction, that is, the magnetic sensor 240 is opposite the junction of the north pole and the south pole of the magnet 230. When each magnet 230 corresponds to two magnetic sensors 240, FIG24 is another schematic diagram of a magnet and a magnetic sensor in cooperation according to an embodiment of the present application. As shown in FIG24, the north pole and the south pole of the magnet 230 each correspond to a magnetic sensor 240. In addition, the magnetic sensor 240 can be located at the center of the north pole or the south pole. When each magnet 230 corresponds to three magnetic sensors 240, FIG25 is another schematic diagram of a magnet and a magnetic sensor in cooperation according to an embodiment of the present application. As shown in FIG25, the south pole, the north pole, and the junction of the south pole and the north pole of the magnet 230 each correspond to a magnetic sensor 240.

[0117] It should be noted that when the magnet 230 has a neutral zone, the magnetic sensor 240 facing the connection point between the north pole and the south pole of the magnet 230 is disposed opposite to the neutral zone.

[0118] Figure 26 is a schematic diagram showing one connection between the magnetic sensor and the control unit provided in an embodiment of the present application, Figure 27 is another schematic diagram showing another connection between the magnetic sensor and the control unit provided in an embodiment of the present application, and Figure 28 is yet another schematic diagram showing another connection between the magnetic sensor and the control unit provided in an embodiment of the present application. It should be noted that in Figures 26-28, VDD corresponds to the positive electrode, and GND corresponds to the negative electrode.

[0119] In order to send the magnetic field strength detected by the magnetic sensor 240 to the control unit 300, in some possible implementations, as shown in Figures 26 and 27, each magnetic sensor 240 is electrically connected to the control unit 300 separately, or, as shown in Figure 28, all the magnetic sensors 240 of each group of fixed units 220 are electrically connected to the same connection end of the control unit 300, which helps to reduce the number of connection ends occupied by the control unit 300 and can improve the application range of the position detection unit 220.

[0120] Optionally, as shown in Figures 26-28, it may also include: an amplifier 500 and an analog-to-digital converter 600, the output end of the analog-to-digital converter 600 is electrically connected to the connection end of the control unit 300, the input end of the analog-to-digital converter 600 is electrically connected to the output end of the amplifier 500, and the two input ends of the amplifier 500 are respectively electrically connected to the two interfaces of the magnetic sensor 240.

[0121] The following describes in detail the connection scheme between the magnetic sensor 240 and the control unit 300, taking the example that each group of fixing units 220 includes two magnetic sensors 240:

[0122] 26 , each magnetic sensor 240 is electrically connected to a power supply individually, and each magnetic sensor 240 is electrically connected to a connection terminal of the control unit 300 via an amplifier 500 and an analog-to-digital amplifier 500, thereby realizing that each magnetic sensor 240 is electrically connected to the control unit 300 individually.

[0123] 27 , four magnetic sensors 240 are electrically connected to the same power supply, and each magnetic sensor 240 is electrically connected to a connection terminal of the control unit 300 via an amplifier 500 and an analog-to-digital amplifier 500 , so that each magnetic sensor 240 is electrically connected to the control unit 300 separately.

[0124] Referring to Figure 28, the two magnetic sensors 240 of each group of fixed units 220 are electrically connected to the same power supply, and the two magnetic sensors 240 of each group of fixed units 220 are electrically connected to a connection end of the control unit 300 through an amplifier 500 and an analog-to-digital amplifier 500, so that all the magnetic sensors 240 of each group of fixed units 220 are electrically connected to the same connection end of the control unit 300.

[0125] It should be noted that when all the magnetic sensors 240 of one group of fixed units 220 are electrically connected to a connection end of the control unit 300 through an amplifier 500 and an analog-to-digital converter 600, and all the magnetic sensors 240 of the other group of fixed units 220 are electrically connected to a connection end of the control unit 300 through an amplifier 500 and an analog-to-digital amplifier 500, respectively, when the control unit 300 calculates the magnetic field signals uploaded by the two groups of fixed units 220, the sum of the magnetic field signals uploaded by each group of fixed units 220 needs to be divided by 2 to ensure that the magnetic field strength remains unchanged.

[0126] In the description of the embodiments of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to a fixed connection, an indirect connection via an intermediate medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on specific circumstances.

[0127] In the embodiments of the present application, any device or element referred to or implied must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present application. In the description of the embodiments of the present application, the meaning of "plurality" is two or more, unless otherwise specifically specified.

[0128] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0129] The term "plurality" in this document refers to two or more. The term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A alone, A and B together, or B alone. Furthermore, the character " / " in this document generally indicates an "or" relationship between the related objects; in a formula, the character " / " indicates a "division" relationship between the related objects.

[0130] It will be understood that the various numerical numbers involved in the embodiments of the present application are merely distinctions for the convenience of description and are not intended to limit the scope of the embodiments of the present application.

[0131] It can be understood that in the embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

Claims

1. A camera module, characterized in that: At least: an imaging unit and a position detection unit; The imaging unit includes a moving component that moves along a first direction; The position detection unit includes two movable parts and two sets of fixed units; The two movable members are respectively fastened to opposite ends of the moving component and are located between the two groups of fixed units, and the two movable members are spaced apart along a second direction; wherein the second direction is perpendicular to the first direction; Each group of the fixing units includes at least one fixing member, and the two groups of the fixing units are arranged opposite to each other along the second direction; when each group of the fixing units includes a plurality of the fixing members, the plurality of the fixing members of each group of the fixing units are arranged at intervals along the first direction; One of the movable member and the fixed member is a magnet, and the other of the movable member and the fixed member is a magnetic sensor; The magnetic sensor is used to detect the magnetic field strength of the magnet corresponding to the magnetic sensor.

2. The camera module according to claim 1, wherein: The movable element is a magnet, and the fixed element is a magnetic sensor.

3. The camera module according to claim 2, wherein: Each group of the fixing units includes the same number of the fixing members.

4. The camera module according to claim 3, wherein: Each group of the fixing units includes one fixing member, two fixing members or three fixing members.

5. The camera module according to claim 3 or 4, characterized in that: All the fixing members of the fixing units of one group correspond one-to-one to all the fixing members of the fixing units of the other group.

6. The camera module according to claim 2, wherein: The two groups of fixing units have different numbers of fixing members.

7. The camera module according to claim 6, wherein: The difference between the number of the fixing elements in one of the two groups of fixing units and the number of the fixing elements in the other group of fixing units is 1, 2 or 3.

8. The camera module according to claim 7, wherein: One of the groups of fixing units includes one fixing element, and the other group of fixing units includes two or three fixing elements.

9. The camera module according to claim 8, wherein: When the other group of fixing units includes two fixing members, the fixing member of one group of fixing units is located in the middle of the two fixing members of the other group of fixing units; or When the other group of fixing units includes three fixing members, the fixing members of the one group of fixing units are arranged opposite to the fixing member located in the middle of the three fixing members of the other group of fixing units along the second direction.

10. The camera module according to any one of claims 2 to 9, wherein: The two magnets are arranged to attract each other along the second direction, or the two magnets are arranged to repel each other along the second direction.

11. The camera module according to any one of claims 1 to 10, wherein: The magnetic sensor is any one of the following sensors: a Hall sensor, a giant magnetoresistive sensor, a tunneling magnetoresistive sensor, an anisotropic magnetoresistive sensor, or an integrated sensor signal processing chip.

12. The camera module according to any one of claims 1 to 11, wherein: The moving part is a lens group or a photosensitive chip; When the moving component is the lens group, the lens group includes at least one lens that moves along the first direction, and the two movable parts are fastened to the same lens.

13. The camera module according to any one of claims 1 to 12, wherein: Also includes: control unit; Each of the magnetic sensors is electrically connected to the control unit; The control unit is used to receive the magnetic field signal uploaded by each magnetic sensor and determine the position of the moving part according to all the magnetic field signals.

14. The camera module according to claim 13, wherein: Also includes: A driving unit; the driving unit is electrically connected to the control unit and is drivingly connected to the moving component; The control unit is further configured to control the driving unit to drive the moving component to move along a first direction according to the magnetic field signal.

15. The camera module according to claim 13 or 14, wherein: Each of the magnetic sensors is electrically connected to the control unit individually; or, All the magnetic sensors of each group of the fixing units are electrically connected to the same connection end of the control unit.

16. The camera module according to any one of claims 1 to 15, wherein: The magnet is a magnet or a magnet.

17. An electronic device, characterized in that: It comprises a shell and a camera module as described in any one of claims 1 to 16; the camera module is arranged on the shell.

Images