Camera module and working method thereof

Abstract

The present invention provides a camera module and a working method thereof, wherein the camera module comprises: a moving unit, a fixing unit and at least one locking structure; the moving unit comprises a lens module, and the moving unit is suitable for driving the lens module to move along the optical axis; the fixing unit is suitable for carrying the moving unit, and the locking structure is arranged in the fixing unit and is suitable for locking or releasing the moving unit. The present invention provides a camera module and a working method thereof, which can realize a camera module with a large moving stroke of the lens module.

Description

Technical Field

[0001] The invention relates to a camera module and a working method thereof. Background Art

[0002] With the rapid development of the smartphone industry, people's requirements for mobile phone camera imaging effects are gradually increasing. Compared with traditional camera systems, cell phone camera modules (CCM) are widely used in various new generation portable camera devices due to their advantages such as miniaturization, low power consumption, low cost and high image quality.

[0003] Currently, the structure of a camera module includes a lens unit, a voice coil motor (VCM), an infrared cutoff filter, an image sensor, a flexible printed circuit board (FPC) or a printed circuit board (PCB), and a connector connected to the mobile phone motherboard.

[0004] Among them, the voice coil motor is used to realize the autofocus function of the lens unit, and the voice coil motor usually includes a magnet, a coil and other structures as an actuator to drive the lens unit. During the operation of the camera module, the coil is first energized with current, and a magnetic field is generated after the current is energized. The magnetic field generated in the coil interacts with the magnetic field generated by the magnet to generate an electromagnetic force. The coil or magnet moves under the action of the electromagnetic force, thereby driving the lens unit connected to the voice coil motor to move, adjusting the image distance and object distance of the camera module, and presenting a clear image.

[0005] Usually, a Hall-effect Sensor can also be set in the voice coil motor. The Hall-effect Sensor is used to measure the change of the magnetic field in the voice coil motor, and the position of the coil or magnet is determined according to the change of the magnetic field, thereby realizing closed-loop control of the voice coil motor.

[0006] However, in conventional technology, it is not easy for a camera module that can realize closed-loop control of a voice coil motor to realize a larger movement stroke of a lens module. Summary of the invention

[0007] The object of the present invention is to provide a camera module capable of realizing a larger moving stroke of a lens module.

[0008] Based on the above considerations, the present invention provides a camera module, comprising:

[0009] A moving unit, a fixed unit and at least one locking structure;

[0010] The moving unit includes a lens module, and the moving unit is suitable for driving the lens module to move along the optical axis direction;

[0011] The fixed unit is suitable for carrying the movable unit, and the locking structure is arranged in the fixed unit and is suitable for locking or releasing the movable unit.

[0012] Preferably, the locking structure includes a solenoid valve.

[0013] Preferably, the solenoid valve comprises:

[0014] A moving iron core, a coil, a fixed iron core, a spring and an electromagnetic valve circuit module. The coil is arranged on the fixed iron core and is powered by the electromagnetic valve circuit module. The fixed iron core and the moving iron core are respectively connected to the two ends of the spring.

[0015] Preferably, the locking structure further includes:

[0016] A first baffle, the first baffle being adjacent to a first side surface of the moving unit, the first baffle further comprising a through hole adapted to accommodate the moving iron core;

[0017] When the solenoid valve circuit module is not powered, the moving iron core is supported by the spring sheet and passes through the through hole, and is located at the top of the first side surface to clamp the moving unit;

[0018] When the solenoid valve circuit module is powered on, the moving iron core overcomes the flexural stress of the spring under the action of the electromagnetic force and approaches the coil to release the moving unit.

[0019] Preferably, the movable unit further includes a magnetic component; the fixed unit further includes a yoke component, and the yoke component is arranged opposite to the magnetic component.

[0020] Preferably, it includes:

[0021] The moving unit further comprises at least two guide rails, the extension direction of the guide rails is parallel to the direction of the optical axis, and the arrangement direction of the guide rails is parallel to the plane where the magnetic component is located;

[0022] The fixing unit comprises at least two abutting components, and the abutting components correspond to the guide rails one by one;

[0023] The guide rail is adapted to move along the abutting component to ensure that the moving direction of the moving unit remains parallel to the optical axis direction.

[0024] Preferably, the guide rail comprises at least one inverted trapezoidal groove, the groove contacts the side surface of the abutting component, and the contact surface between the groove and the abutting component is parallel to the optical axis direction.

[0025] Preferably, the opening angle of the inverted trapezoidal groove is 80° to 100°.

[0026] Preferably, the guide rail includes at least two of the inverted trapezoidal grooves, and the inverted trapezoidal grooves are arranged sequentially along a direction parallel to the optical axis.

[0027] Preferably, the abutting component is a guide column or a ball.

[0028] Preferably, a lubricant layer is further provided between the abutting component and the guide rail.

[0029] Preferably, a flexible connection structure is fixedly connected between the upper end of the movable unit and the upper end of the fixed unit.

[0030] Preferably, the fixing unit further includes a driving unit and a Hall sensor;

[0031] The driving unit is adapted to provide an electrical signal to drive the moving unit to move;

[0032] The Hall sensor is adapted to feed back the position of the moving unit to the driving unit;

[0033] When the moving unit moves to a preset position, the driving unit is adapted to stop driving and control the moving unit to remain at the preset position.

[0034] Preferably, the moving range of the lens module is greater than 800 μm.

[0035] The present invention also provides a working method of the camera module as described above, comprising:

[0036] Step S10: supplying power to the locking structure through the driving unit, and releasing the locking state of the moving unit;

[0037] Step S20: driving the moving unit to move along the optical axis by the driving unit;

[0038] Step S30: sensing the change of the magnetic field through the Hall sensor, thereby detecting the moving position of the mobile unit;

[0039] Step S40: when the focus shooting is completed and the moving unit returns to the initial position, the driving unit stops supplying power to the locking structure, and the moving unit is locked;

[0040] Step S50: the driving unit is powered off, and the camera module stops working.

[0041] The camera module provided in the technical solution of the present invention can lock or release the movable unit carrying the lens module by adding a locking structure in the fixed unit, thereby preventing the lens module from being fully extended when the camera module is not working, thereby preventing it from being damaged.

[0042] Furthermore, in the camera module provided in the technical solution of the present invention, the fixed unit further comprises a yoke component, and the yoke component is arranged opposite to the magnetic component on the mobile unit. In this way, the fixed unit and the mobile unit are more closely attached to each other under the magnetic attraction of the yoke component and the magnetic component of the magnetic component.

[0043] Furthermore, the camera module provided in the technical solution of the present invention also provides a support component and a guide rail, and the guide rail is suitable for moving along the support component to ensure that the moving direction of the mobile unit remains parallel to the optical axis direction, that is, to ensure that the optical axis is maintained perpendicular to the photosensitive surface of the image sensor chip.

[0044] Furthermore, the guide rail is an inverted trapezoidal groove, which can better wrap the abutment component, so that the contact surface and contact angle between the groove and the abutment component are more appropriate.

[0045] Furthermore, the camera module provided in the technical solution of the present invention also provides a flexible connection structure, and when the lens barrel module performs telescopic movement, the flexible connection structure can prevent foreign objects from entering the cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Other features, objects and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0047] Figures 1 to 3 A schematic diagram of the structure of a camera module provided by an embodiment of the present invention;

[0048] Figures 4 to 5 A schematic diagram of a solenoid valve in a camera module provided according to an embodiment of the present invention;

[0049] Figure 6 A schematic diagram of a locking structure provided by another embodiment of the present invention;

[0050] Figures 7 to 9 A schematic diagram of a driving unit in a camera module provided according to an embodiment of the present invention;

[0051] Fig.10 A schematic diagram of a flexible connection structure provided by an embodiment of the present invention;

[0052] Fig.11A schematic diagram of a camera module provided by an embodiment of the present invention;

[0053] Fig.12 The present invention is a flowchart of a working method of a camera module provided by an embodiment of the present invention.

[0054] In the drawings, the same or similar reference numerals denote the same or similar devices (modules) or steps throughout different drawings. DETAILED DESCRIPTION

[0055] In order to solve the above problems in the prior art, the present invention provides a camera module, in which the movement stroke of the lens module can achieve a long stroke.

[0056] In the following specific description of the preferred embodiments, reference will be made to the attached drawings which constitute a part of the present invention. The attached drawings show by way of example specific embodiments that can implement the present invention. The illustrative embodiments are not intended to be exhaustive of all embodiments according to the present invention. It will be appreciated that other embodiments may be utilized, and structural or logical modifications may also be made without departing from the scope of the present invention. Therefore, the following specific description is not restrictive, and the scope of the present invention is limited by the appended claims.

[0057] like Figure 1 As shown, an embodiment of the present invention provides a camera module, including: a moving unit 200, a fixing unit 100 and a locking structure 110.

[0058] In this embodiment, the moving unit 200 includes a lens module 210, and the moving unit 200 is suitable for driving the lens module 210 to move along the optical axis direction; specifically, in this embodiment, the moving unit 200 includes a supporting platform 220 and a lens module 210, and the supporting platform 220 is connected to the lens module 210, and the lens module 210 is driven to move by the supporting platform 220.

[0059] The fixed unit 100 is suitable for carrying the moving unit 200. The fixed unit 100 includes a receiving space, and the carrying platform 220 is suitable for being placed in the receiving space of the fixed unit 100 and carrying the lens module 210 to move along the optical axis direction.

[0060] In this embodiment, the camera module provided by the present invention further includes a housing 300 and a flexible connection structure 400. The housing includes an inner cavity and an opening located in the middle of the upper portion of the inner cavity. The fixing unit 100 and the supporting platform 220 are suitable for being placed in the inner cavity of the housing 300, and the lens module 210 is suitable for passing through the opening located in the middle of the upper portion of the inner cavity. When the supporting platform 220 carries the lens module 210 to reciprocate along the optical axis direction, the lens module 210 reciprocates through the opening. Since the camera module provided by the present invention is a long-stroke module, the length of the lens module 210 fully extending out of the opening in the middle of the upper portion of the inner cavity is much greater than that of a general short-stroke camera module.

[0061] Specifically, in one embodiment, the camera module provided by the present invention further includes a locking structure 110, which is disposed at a corner of the accommodation space of the fixed unit 100 and is suitable for locking or releasing the mobile unit 200. That is, when the camera module is not working, the locking structure 110 is suitable for locking the mobile module to prevent the lens module 210 from completely extending out of the opening in the middle of the upper inner cavity of the housing, causing damage.

[0062] Combination Figure 1 ,refer to Figures 2 to 3 As shown, the locking structure includes a first baffle 107 and a solenoid valve. Specifically, in this embodiment, the first baffle 107 includes two sides and a locking space formed with a corner of the accommodation space. The solenoid valve is arranged in the locking space.

[0063] Combination Figure 1 , and refer to Figures 4 to 5 The solenoid valve of the locking structure 110 includes: a moving iron core 111, a coil 112, a fixed iron core 113, a spring 115 and a solenoid valve circuit module 114. The fixed iron core 113 is arranged on the solenoid valve circuit module 114, and the coil 112 is arranged on the fixed iron core 113. In addition, the fixed iron core 113 and the moving iron core 111 are connected to both ends of the spring 115 respectively.

[0064] Recombination Figures 1 to 5 As shown, specifically, the first side surface of the supporting platform of the movable unit is adjacent to the first baffle plate 107, and the first baffle plate 107 has a through hole. When the moving iron core 111 extends out of the through hole of the first baffle plate 107, it is located at the top of the first side surface, that is, the top of the supporting platform, thereby jamming the movable unit and limiting the movement of the movable unit in the direction of the optical axis.

[0065] Specifically, in this embodiment, when the coil 112 of the solenoid valve is not energized, the spring piece 115 is in an extended state, and the front end of the movable iron core 111 is supported by the spring piece 115 to pass through the through hole and is located at the top of the first side surface to clamp the movable unit and limit the movement of the movable unit 200 in the direction of the optical axis.

[0066] When the coil 112 of the solenoid valve is energized, the coil 112 generates an electromagnetic force, which attracts the moving iron core 111. Under the action of the electromagnetic force, the moving iron core overcomes the flexural stress of the spring and moves toward the coil 112, thereby removing the obstruction to the moving unit 200, and the moving unit can move along the optical axis.

[0067] In another embodiment, if Figure 6 As shown, the locking structures 110 provided by the present invention may be two, which are arranged in the accommodation space of the fixed unit 100, and are symmetrically arranged on both sides of the mobile unit 200, so that the mobile unit 200 can be locked or released from both sides of the mobile unit. Providing two symmetrical locking structures 110 located on both sides of the mobile unit can make both sides of the mobile unit locked or released, which is conducive to maintaining the balance of the two sides of the mobile unit, ensuring that the mobile unit remains in a plane perpendicular to the optical axis, avoiding left and right deviation, that is, ensuring that the optical axis is maintained perpendicular to the photosensitive surface of the image sensor chip.

[0068] Continue to combine Figures 1 to 3 ,refer to Figures 7 to 9 As shown, in this embodiment, the fixing unit 100 further includes a driving unit 120 and a yoke component 130. In this embodiment, the yoke component 130 is a magnetically conductive metal sheet.

[0069] The driving unit 120 includes a driving chip 121, a driving coil 122, a driving circuit board 123 and a Hall sensor 124. The driving chip 121, the driving coil 122 and the Hall sensor 124 are arranged on one side of the driving circuit board 123. In this embodiment, the driving chip 121 and the Hall sensor 124 are integrated into one. In other embodiments, the driving chip 121 and the Hall sensor 124 may also be separated from each other.

[0070] The driving unit 120 is disposed inside the fixing unit 100 , that is, a side of the driving circuit board 123 where the driving chip 121 , the driving coil 122 and the Hall sensor 124 are disposed faces one side of the accommodation space.

[0071] The magnetically conductive metal sheet 130 is disposed outside the fixing unit 100, and is disposed back to back with the driving unit 120. In a specific embodiment, a substrate may be placed on one side of the fixing unit, and the magnetically conductive metal sheet 130 is added outside the substrate.

[0072] The moving unit 200 includes a magnetic component. In this embodiment, the magnetic component is a driving magnet 151, and the driving magnet 151 has polarity distributed along the optical axis.

[0073] The driving chip 121, driving coil 122 and Hall sensor 124 on the fixed unit 100 are parallel to the driving magnet 151 on the mobile unit. The driving unit 120 is adapted to provide an electrical signal to change the direction of the current in the driving coil 122, generate an electromagnetic force, and generate an interaction force with the driving magnet 151, thereby driving the mobile unit 200 to reciprocate in the direction of the optical axis. The Hall sensor 124 feeds back the position to which the mobile unit 200 moves to the driving unit 120. When the mobile unit 200 moves to a preset position, the driving is stopped.

[0074] In this embodiment, the driving magnet 151 is also mutually attracted to the magnetically conductive metal sheet 130 outside the fixed unit 100. The magnetically conductive metal sheet 130 is arranged opposite to the driving unit 120, so that the mobile unit 200 and the fixed unit 100 are more closely attached under the action of magnetic attraction.

[0075] For details, please refer to Figures 1 to 3 As shown, in this embodiment, abutment structure is further provided between the moving unit 200 and the fixing unit 100 .

[0076] The abutting structure includes at least two guide rails 240 located on the mobile unit 200 and at least two abutting components 141 located on the fixed unit 100. The extension direction of the guide rails 240 is parallel to the optical axis direction, and the arrangement direction of the guide rails 240 is parallel to the plane where the magnetic conductive metal sheet 130 is located. The abutting components 141 correspond to the guide rails 240 one by one. The guide rails 240 are suitable for moving along the abutting components 141 to ensure that the moving direction of the mobile unit 200 remains parallel to the optical axis direction, that is, to ensure that the optical axis is maintained perpendicular to the photosensitive surface of the image sensor chip.

[0077] When the driving unit 120 is working, under the action of the driving coil, due to the mutual attraction between the magnetic metal sheet and the driving magnet 151, the abutment structure between the mobile unit 200 and the fixed unit 100 fits tightly, ensuring that when the mobile unit 200 reciprocates in the direction of the optical axis, the movement of the mobile unit 200 remains stable along the direction of the optical axis to avoid shaking left and right.

[0078] The guide rail 240 includes at least one inverted trapezoidal groove, the groove contacts the side surface of the abutting component, and the contact surface between the groove and the abutting component is parallel to the optical axis direction.

[0079] In one embodiment, the opening angle of the inverted trapezoidal groove is 80° to 100°. In this way, the abutting component can be well covered, so that the contact surface and contact angle between the groove and the abutting component are more appropriate. When the opening angle of the inverted trapezoidal groove is less than 80°, the force exerted on the abutting component by both sides of the inverted trapezoidal groove is relatively small, making the overall force of the abutting component easily unbalanced, resulting in unstable movement of the mobile unit, which is not conducive to maintaining the smooth and accurate reciprocating motion of the mobile unit.

[0080] When the opening angle of the inverted trapezoidal groove is greater than 100°, the force between the abutment component and the inverted trapezoidal groove will tend to one side of the inverted trapezoidal groove, making the overall force of the abutment component easily unbalanced, thereby making the movement of the mobile unit unstable, which is not conducive to maintaining the smooth and precise reciprocating motion of the mobile unit.

[0081] In one embodiment, the guide rail includes at least two inverted trapezoidal grooves, and the inverted trapezoidal grooves are arranged in sequence along the optical axis. Figure 7 As shown in , in the guide rail corresponding to each abutting component, there are two or more inverted trapezoidal grooves (not shown). In this way, the contact area between the guide rail formed by the separated inverted trapezoidal grooves and the abutting component is small, which is convenient for controlling the horizontality of each surface during processing, and can better maintain the smoothness and accuracy of the reciprocating motion of the moving unit.

[0082] In one embodiment, the abutment component is a guide column or a ball.

[0083] A lubricant layer is also included between the abutment component and the guide rail. The lubricant layer may be a semi-wet lubricant layer or a lubricating coating. In one embodiment, a semi-wet lubricant layer is applied between the abutment component and the guide rail. The semi-wet lubricant layer may be a synthetic grease, which will not melt, decompose, or volatilize. Applying the semi-wet lubricant layer on the abutment component may reduce the friction coefficient between the abutment component and the guide rail. In another embodiment, a lubricating coating may be added on the guide rail as a lubricant layer.

[0084] Combination Figure 1 ,refer to Fig.10 As shown, the camera module provided in the embodiment of the present invention also includes a flexible connection structure 400. Specifically, a flexible connection structure is fixedly connected between the upper part of the movable unit and the upper end of the fixed unit. The flexible connection structure 400 forms a cavity with the movable unit and the fixed unit. When the lens module performs telescopic movement, the flexible connection structure 400 moves along with the lens module, and can prevent foreign objects that affect the imaging performance from entering the cavity, the foreign objects include: water, oil, dust, etc., thereby improving the imaging performance of the camera. In order to clearly show the flexible connection structure, Fig. 9 The flexible connection structure 400 is shown as being relatively thick. In a specific embodiment, the flexible connection structure 400 may be a relatively thin material layer.

[0085] Combination Figure 1 ,refer to Fig.11 As shown, the camera module provided in the embodiment of the present invention further includes a housing 300 . Fig.11 The figure shows the overall appearance of the camera module after the housing is assembled.

[0086] In the camera module provided by the present invention, the moving range of the lens module is greater than 800 μm. In one embodiment, the moving range of the lens module is 1500 μm. The camera module provided by the present invention is suitable for handheld or portable digital devices, including but not limited to: mobile communication terminals, tablet digital devices, PC tablet two-in-one, etc.

[0087] In addition, in the embodiment of the camera module provided by the present invention, a working method of the camera module as described above is also provided, referring to Fig.12 As shown, specifically:

[0088] Step S10: supplying power to the locking structure through the driving unit, and releasing the locking state of the moving unit;

[0089] Step S20: driving the moving unit to move along the optical axis by the driving unit;

[0090] Step S30: sensing the change of the magnetic field through the Hall sensor, thereby detecting the moving position of the mobile unit;

[0091] Step S40: when the focus shooting is completed and the moving unit returns to the initial position, the driving unit stops supplying power to the locking structure, and the moving unit is locked;

[0092] Step S50: the driving coil is powered off and the camera module stops working.

[0093] In one embodiment, the locking structure is a solenoid valve, and the specific method is:

[0094] Step S10': supplying power to the solenoid valve through the driving chip, causing the moving iron core of the solenoid valve to move toward the coil, and the locking state of the moving unit is released;

[0095] Step S20': supplying power to the driving coil via the driving chip, so that the moving unit moves along the optical axis;

[0096] Step S30': the Hall sensor detects the movement position of the mobile unit by detecting the change of the magnetic field;

[0097] Step S40 ′: when the focusing and shooting is completed and the moving unit returns to the initial position, the driving chip stops supplying power to the solenoid valve, and the moving iron core returns to the position of locking the moving unit under the stress of the spring.

[0098] Step S50 ′: the driving coil is powered off, and the camera module stops working.

[0099] The driving method of the electromagnetic motor of the present invention controls the working cooperation of the locking structure and the driving coil through the driving chip, so that when the camera module is not working, the locking structure 110 can lock the moving module to prevent the lens module 210 from completely extending out of the opening in the middle of the upper inner cavity of the shell and causing damage. When the camera module is working, the locking structure 110 can be released in time, so that the lens module 210 can start working smoothly.

[0100] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, in any case, the embodiments should be considered exemplary and non-restrictive. Furthermore, it is apparent that the term "comprising" does not exclude other elements and steps, and the wording "a" does not exclude the plural. Multiple elements stated in a device claim may also be implemented by one element. The words first, second, etc. are used to indicate names and do not indicate any particular order.

Claims

1. A camera module, characterized in that: include: A moving unit, a fixed unit and at least one locking structure; The moving unit includes a lens module, and the moving unit is suitable for driving the lens module to move along the optical axis direction; The fixed unit is suitable for carrying the mobile unit, and the locking structure is arranged in the fixed unit and is suitable for locking or releasing the mobile unit; The locking structure includes a solenoid valve, and the solenoid valve includes: A moving iron core, a coil, a fixed iron core, a spring and a solenoid valve circuit module, wherein the coil is arranged on the fixed iron core and is powered by the solenoid valve circuit module; the fixed iron core and the moving iron core are respectively connected to two ends of the spring; The locking structure further comprises: A first baffle, the first baffle being adjacent to a first side surface of the moving unit, the first baffle further comprising a through hole adapted to accommodate the moving iron core; When the solenoid valve circuit module is not powered, the moving iron core is supported by the spring sheet to pass through the through hole and is located at the top of the first side surface to clamp the moving unit.

2. The camera module according to claim 1, wherein: When the solenoid valve circuit module is powered on, the moving iron core overcomes the flexural stress of the spring under the action of the electromagnetic force and approaches the coil to release the moving unit.

3. The camera module according to claim 1, wherein: include: The moving unit further includes a magnetic component; the fixing unit further includes a yoke component, and the yoke component is arranged opposite to the magnetic component.

4. The camera module according to claim 3, wherein: include: The moving unit further comprises at least two guide rails, the extension direction of the guide rails is parallel to the optical axis direction, and the arrangement direction of the guide rails is parallel to the plane where the magnetic component is located; the fixing unit comprises at least two abutting components, and the abutting components correspond to the guide rails one by one; The guide rail is adapted to move along the abutting component to ensure that the moving direction of the moving unit remains parallel to the optical axis direction.

5. The camera module according to claim 4, characterized in that: The guide rail includes at least one inverted trapezoidal groove, the groove contacts the side surface of the abutting component, and the contact surface between the groove and the abutting component is parallel to the optical axis direction.

6. The camera module according to claim 5, characterized in that: include: The opening angle of the inverted trapezoidal groove is 80° to 100°.

7. The camera module according to claim 5, characterized in that: include: The guide rail includes at least two inverted trapezoidal grooves, and the inverted trapezoidal grooves are arranged sequentially along a direction parallel to the optical axis.

8. The camera module according to claim 4, wherein: The abutting component is a guide column or a ball.

9. The camera module according to claim 4, wherein: A lubricant layer is further included between the abutting component and the guide rail.

10. The camera module according to claim 1, wherein: A flexible connection structure is also fixedly connected between the upper end of the movable unit and the upper end of the fixed unit.

11. The camera module according to claim 3, wherein: The fixing unit further includes a driving unit and a Hall sensor; The driving unit is adapted to provide an electrical signal to drive the moving unit to move; The Hall sensor is adapted to feed back the position of the moving unit to the driving unit; When the moving unit moves to a preset position, the driving unit is adapted to stop driving and control the moving unit to remain at the preset position.

12. The camera module according to claim 1, wherein: The moving travel range of the lens module is greater than 800 μm.

13. A method for operating a camera module as claimed in claim 1, characterized in that: include: Step S10: supplying power to the locking structure through the driving unit, and releasing the locking state of the moving unit; Step S20: driving the moving unit to move along the optical axis by the driving unit; Step S30: sensing the change of the magnetic field through the Hall sensor, thereby detecting the moving position of the mobile unit; Step S40: when the focus shooting is completed and the moving unit returns to the initial position, the driving unit stops supplying power to the locking structure, and the moving unit is locked; Step S50: the driving unit is powered off, and the camera module stops working.

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