A camera module and electronic device

Abstract

This invention discloses a camera module and an electronic device. The camera module includes: a first driving device, comprising a first housing and a first driving mechanism disposed within the first housing; a lens disposed within the first housing and connected to the first driving mechanism, the first driving mechanism being used to drive the lens to extend or retract into the first housing; a pressure sensor connected to the first housing, the first driving mechanism controlling the lens to retract into the first housing based on a signal from the pressure sensor; and a lens protective cover, slidably engaged with the first housing and covering the outside of the lens, the lens protective cover moving towards the pressure sensor after being pressed to squeeze the pressure sensor. The camera module of this invention provides better protection for the lens; in the event of collision or compression, the lens and its driving mechanism are less prone to damage, resulting in higher reliability.

Description

Technical Field

[0001] This invention relates to the field of camera technology, and more particularly to a camera module and electronic device. Background Technology

[0002] Electronic devices such as mobile phones, tablets, and cameras are usually equipped with cameras. As the requirements for image quality become higher and higher, the requirements for the focal length and zoom performance of cameras also become higher and higher. In order to meet the needs, some electronic devices have already used telescopic lenses that can zoom over a wide range to improve image quality.

[0003] Currently, camera modules in electronic devices typically include a lens and a voice coil motor (VCM). The VCM is used to drive the lens to extend or retract, thereby controlling the lens's telescopic movement.

[0004] The shortcomings of the existing technology are as follows: First, after the lens is extended, it will be higher than the surface of the product, and the protruding lens is easily damaged by direct impact or pressure. Second, in the extended state, the force arm of the compression and collision is also larger, making the lens drive mechanism more susceptible to damage and the internal components more prone to deformation, thereby affecting the image quality of the lens and the transmission accuracy of the drive mechanism, and affecting the normal operation of the camera module.

[0005] Therefore, it is necessary to improve the existing technology to overcome the aforementioned defects. Summary of the Invention

[0006] The purpose of this invention is to provide a camera module and electronic device that provides better protection for the lens.

[0007] To achieve the above-mentioned objectives, in one aspect, the present invention proposes a camera module, comprising:

[0008] The first driving device includes a first housing and a first driving mechanism disposed within the first housing;

[0009] The lens is disposed inside the first housing and connected to the first driving mechanism, which is used to drive the lens to extend or retract into the first housing.

[0010] A pressure sensor, connected to the first housing, and a first drive mechanism controlling the lens to retract into the first housing based on the signal from the pressure sensor; and

[0011] A lens cover is slidably fitted to the first housing and covers the outside of the lens. The lens cover presses against the pressure sensor when it is under pressure.

[0012] Furthermore, the pressure sensor includes a pressure sensing layer connected to the first housing and a protective layer disposed on the surface of the pressure sensing layer.

[0013] Furthermore, the first housing includes an opening for the lens to extend out and an end face surrounding the outer periphery of the opening, the lens cover is slidably engaged with the opening, and the pressure sensor is disposed on the end face and located between the lens cover and the end face.

[0014] Furthermore, the number of pressure sensors is one, and it surrounds the outer periphery of the opening; or,

[0015] The pressure sensors are multiple, and the multiple pressure sensors cooperate to form a ring around the outer periphery of the opening.

[0016] Furthermore, the first driving device also includes a carrier disposed inside the first housing and connected to the first driving mechanism, the lens being connected to the carrier, and the first driving mechanism driving the carrier to move to move the lens.

[0017] Furthermore, the camera module also includes a second driving device, which includes a second housing and a second driving mechanism disposed within the second housing. The first driving device is disposed within the second housing and connected to the second driving mechanism. The second driving mechanism is used to drive the first driving device to move along the telescopic direction of the lens.

[0018] Furthermore, the opening is provided with a first protruding ring, and the cover includes a plate, an annular wall connected to the plate, and a second protruding ring protruding inward from the annular wall. The first and second protruding rings are connected to each other.

[0019] Furthermore, a flexible layer is provided between the first convex ring and the plate body. The flexible layer applies an elastic force to the cover body away from the pressure sensor. After being pressed, the lens protective cover compresses the flexible layer and squeezes the pressure sensor.

[0020] Furthermore, the camera module also includes a control system electrically connected to the pressure sensor and the first drive mechanism, the control system issuing control commands to the first drive mechanism based on the signal from the pressure sensor.

[0021] Furthermore, the control system includes a signal processing circuit electrically connected to the pressure sensor and a main control chip electrically connected to the signal processing circuit. The signal processing circuit includes an input positive terminal IN+, an input negative terminal IN-, a filter circuit connected to the input positive terminal IN+, a pre-amplifier circuit connected to the input negative terminal IN- and the filter circuit, a single-ended amplifier circuit connected to the pre-amplifier circuit, a DC blocking circuit connected to the single-ended amplifier circuit, and an analog-to-digital converter (ADC) connected to the DC blocking circuit.

[0022] Furthermore, the preamplifier circuit includes operational amplifiers U1, U2, and U3. The non-inverting input terminal of operational amplifier U1 is connected to the negative input terminal IN-. Resistors R1 and R2 are connected in series between the inverting input terminal of operational amplifier U1 and the inverting input terminal of operational amplifier U2. Resistor R4 is connected between the inverting input terminal and the output terminal of operational amplifier U1. Resistor R5 is connected between the output terminal of operational amplifier U1 and the inverting input terminal of operational amplifier U3. The filter circuit is provided between the non-inverting input terminal and the positive input terminal IN+ of operational amplifier U2. Resistor R3 is connected between the inverting input terminal and the output terminal of operational amplifier U2. Resistor R6 is provided between the output terminal of operational amplifier U2 and the non-inverting input terminal of operational amplifier U3. Resistor R8 is provided between the non-inverting input terminal and ground GND of operational amplifier U3. Resistor R7 is provided between the inverting input terminal and the output terminal of operational amplifier U3.

[0023] The filtering circuit includes a capacitor C1 and a resistor R12 connected in series between the positive input terminal IN+ and the non-inverting input terminal of the operational amplifier U2. The filtering circuit also includes a resistor R13 and a capacitor C2. One end of the resistor R13 is connected to the circuit between the capacitor C1 and the resistor R12, and the other end is connected to ground GND. One end of the capacitor C2 is connected to the non-inverting input terminal of the operational amplifier U2, and the other end is connected to ground GND.

[0024] The single-ended amplifier circuit includes an operational amplifier U4. The non-inverting input terminal of the operational amplifier U4 is connected to the output terminal of the operational amplifier U3. A resistor R10 is connected between its inverting input terminal and its output terminal, and a resistor R9 is connected between its inverting input terminal and ground GND.

[0025] The DC blocking circuit includes an operational amplifier U5. A capacitor C3 is connected between the non-inverting input terminal of the operational amplifier U5 and the output terminal of the operational amplifier U4. A resistor R11 is connected between the non-inverting input terminal of the operational amplifier U5 and the reference voltage VREF. The inverting input terminal of the operational amplifier U5 is connected to its output terminal. The output terminal of the operational amplifier U5 is connected to the analog-to-digital converter (ADC).

[0026] On the other hand, the present invention also proposes an electronic device including a camera module as described in any of the preceding claims.

[0027] Compared with the prior art, the present invention has the following beneficial effects: By setting a lens protective cover connected to the first housing and a pressure sensor corresponding to the lens protective cover, the lens protective cover can apply pressure to the pressure sensor when the mobile phone is accidentally dropped and collided or squeezed by contact with other objects. According to the sensing signal of the pressure sensor, the first driving mechanism can be controlled to drive the lens to retract into the first housing, thereby placing the lens in a safer position, better protecting the lens and the first driving mechanism, and ensuring the reliability of the camera module. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a camera module according to one embodiment of the present invention.

[0029] Figure 2 yes Figure 1 Enlarged view of section I in the middle.

[0030] Figure 3 This is a top view of a pressure sensor connected to a first housing according to one embodiment of the present invention.

[0031] Figure 4 This is a schematic diagram of the connection between the cover and the opening in one embodiment of the present invention.

[0032] Figure 5 This is a top view of the pressure sensor connected to the first housing in another embodiment of the present invention.

[0033] Figure 6 This is a schematic diagram of the structure of a camera module according to another embodiment of the present invention.

[0034] Figure 7 This is a structural diagram of a signal processing circuit according to one embodiment of the present invention. Detailed Implementation

[0035] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0036] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0037] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0038] like Figure 1 As shown, a camera module corresponding to a preferred embodiment of the present invention includes a first driving device 1, a lens 2, a pressure sensor 3, and a lens protective cover 4.

[0039] The first driving device 1 is used to drive the lens 2 to perform linear motion, so that the lens 2 can extend or retract as needed. The first driving device 1 includes a first housing 10 and a first driving mechanism disposed within the first housing 10. The first housing 10 is provided with an inner cavity 102, and the lens 2 is movably disposed within the inner cavity 102. The inner cavity 102 has an opening 1020 communicating with the outside at a first end of the first housing 10, which is the end of the first housing 10 facing the outside of the electronic product. The first driving mechanism is used to drive the lens 2 to move so that the lens 2 can extend outward from the opening 1020, or can retract inward into the inner cavity 102.

[0040] Further integration Figure 2The first outer shell 10 includes an annular body 100 and an annular opening 101 connected to the body 100. The shapes of the body 100 and the opening 101 are not limited, but preferably both are annular and coaxially arranged. The internal space formed by the body 100 and the opening 101 is the inner cavity 102, and the opening 1020 is formed in the opening 101. The outer diameter of the body 100 is larger than the outer diameter of the opening 101. Therefore, a shoulder 103 is formed between the first outer shell 10 and the body 100, and the opening 101 is disposed on the end face 1030 of the shoulder 103.

[0041] Pressure sensor 3 is connected to end face 1030 and is used to detect the pressure. When a collision or compression occurs, pressure sensor 3 will detect the change in pressure. The speed, intensity or magnitude of the pressure change can be used to determine whether the lens 2 needs to be retracted. For example, a pressure threshold can be set. When the pressure sensed by pressure sensor 3 reaches the preset pressure threshold, the lens 2 is controlled to retract.

[0042] In a preferred embodiment, the pressure sensor 3 includes a pressure sensing layer 30 and a protective layer 31 disposed on one side of the sensing layer 30. The pressure sensing layer 30 is used to sense pressure; for example, it can generate an electrical signal based on deformation. Preferably, the pressure sensing layer 30 can be a piezoelectric material layer, a metal strain layer, or a strain ink layer. The protective layer 31 mainly serves to protect and encapsulate the sensor; it can be an ink-printed layer or a polymer vapor-deposited layer. A connecting layer 32 is provided between the pressure sensor 3 and the end face 1030, and the connecting layer 32 is used to fix the pressure sensor 3 to the end face 1030. Preferably, the material of the connecting layer 32 can be thermosetting adhesive, epoxy adhesive, or a film.

[0043] Both the pressure sensor 3 and the first drive mechanism are electrically connected to the camera module's control system. The control system can receive signals from the pressure sensor 3, process and analyze them, and then issue control commands to the first drive mechanism based on the signals, causing the first drive mechanism to operate. Figure 3 As shown, the pressure sensor 3 includes a first connection terminal 33 and a second connection terminal 34. The control system includes a circuit board and a flexible circuit board 5 connected between the circuit board and the pressure sensor 3. The first connection terminal 33 and the second connection terminal 34 are connected to the flexible circuit board 5, through which signals are led out to the circuit board. A main control chip is provided on the circuit board. The main control chip performs calculations based on the received signals and applies control signals to control the first drive mechanism. The circuit board also includes a signal processing circuit connected between the flexible circuit board 5 and the main control chip. The signal processing circuit processes the signals before transmitting them to the main control chip. The specific structure of the signal processing circuit will be described in detail below.

[0044] The lens protective cover 4 is used to protect the lens 2. It includes a cover body 40 connected to the opening 101 and a transparent sheet 41 connected to the cover body 40. The transparent sheet 41 is disposed opposite to the lens 2, does not affect the transmission of light, and can prevent the lens 2 from directly contacting the outside world, thus enhancing the protection of the lens. The lens protective cover 4 is placed on the lens 2, and the lens 2 moves within the space formed by the lens protective cover 4 and the first outer shell 10.

[0045] like Figure 2 and Figure 4 As shown, the cover 40 is movably engaged with the opening 101, and can move a certain distance along the telescopic direction of the lens 2 to move towards and press the pressure sensor 3. Simultaneously, a limiting structure limits the cover 40 to the opening 101 to prevent it from detaching. In a preferred embodiment, the opening 101 has a first protruding ring 1010, and the cover 40 includes a plate 400 for fixing the transparent sheet 41, an annular wall 401 connected to the plate 400, and a second protruding ring 402 protruding inward from the annular wall 401. The first protruding ring 1010 and the second protruding ring 402 are interlocked to prevent the cover 40 from detaching from the opening 101. The lower end of the cover 40 is positioned opposite the pressure sensor 3, and the distance between the second protruding ring 402 and the plate 400 is greater than the thickness of the first protruding ring 1010, allowing the cover 40 to move downward and press the pressure sensor 3. To prevent the cover 40 from shaking, a flexible layer 403 can be provided between the first protruding ring 1010 and the cover 40. The flexible layer 403 can apply an elastic force to the cover 40 away from the pressure sensor 3 to maintain the contact between the first protruding ring 1010 and the second protruding ring 402 and prevent the cover 40 from shaking. The flexible layer 403 can be made of flexible materials such as silicone or rubber.

[0046] Thus, when lens 2 extends, if the phone is dropped and collided, or squeezed for other reasons, the lens protective cover 4 will be the first to contact the ground or other objects, effectively protecting lens 2. In addition, the compressed lens protective cover 4 will press against the pressure sensor 3, causing the pressure sensor 3 to sense the occurrence of adverse situations such as collision and squeezing, and promptly control lens 2 to retract, thus protecting lens 2 and the first drive mechanism and improving the reliability of the camera module.

[0047] In order to enable the pressure sensor 3 to better sense the compression of the cover 40, in a preferred embodiment, refer to Figure 3The pressure sensor 3 is annular, surrounding the outer periphery of the opening 101. It is understood that the pressure sensor 3 does not necessarily have to be a completely closed ring; it may have a notch 35 to facilitate wiring with the flexible circuit board 5. The notch 35 is small so that the pressure sensor 3 can be approximately a complete ring. In another preferred embodiment, refer to... Figure 5 There are multiple pressure sensors 3 (three in the figure), which are arranged around the outer periphery of the opening 101. Preferably, the multiple pressure sensors 3 are evenly distributed with the center of the opening 101 as the center. More preferably, the pressure sensors 3 are partially annular, and the multiple pressure sensors 3 cooperate to form a ring around the outer periphery of the opening 101. Similarly, the ring is not necessarily a closed ring, and there can be a certain gap between two adjacent pressure sensors 3. Since the coverage area of ​​the pressure sensors 3 on the end face is relatively sufficient, the external force on the cover 40 can be applied to the pressure sensors 3 better and more evenly, ensuring that the lens 2 can reliably retract in case of an accident.

[0048] As a preferred implementation method, such as Figure 1 As shown, the first driving device 1 also includes a carrier 12, on which the lens 2 is fixedly mounted. The first driving mechanism is connected to the carrier 12 and drives the lens 2 to move by moving the carrier 12. By setting the carrier 12, the lens 2 can be installed more conveniently, and the protection effect of the lens 2 can be improved, reducing the risk of damaging the lens 2 during installation.

[0049] The driving method of the first driving mechanism is not limited. For example, it can be driven by the combination of an energized coil and a magnet, or by a lead screw transmission mechanism, or by a gear and rack transmission mechanism.

[0050] In a preferred embodiment, the first driving device 1 is a voice coil motor, which uses the cooperation of an energized coil and a magnet to achieve drive. Specifically, its first driving mechanism includes a first magnetic element 15 fixedly disposed on the inner wall of the first housing 10 and a first coil 13 surrounding the outer periphery of the carrier 12. The first housing 10 has an inner cavity 102, in which the carrier 12 is slidably fitted and can move along the axis of the inner cavity 102. There can be one or more first magnetic elements 15, which can generate a magnetic field, and the first coil 13 is located within the magnetic field. The first coil 13 wound on the carrier 12 is connected to a circuit board, which can power and control it. When the first coil 13 is energized, it will be subjected to an Ampere force, thereby moving along the axis of the inner cavity 102. In this way, the first coil 13 can carry the carrier 12 and the lens 2 in a telescopic movement.

[0051] The extension and retraction of lens 2 can be achieved by applying current in the opposite direction to the first coil 13, or by setting an elastic element (not shown in the figure) between the first housing 100 and the carrier 12. When the first coil 13 is energized, lens 2 extends, and the elastic element is driven to undergo elastic deformation. After the first coil 13 is de-energized, the elastic element returns to its original state, driving lens 2 to reset. The elastic element is preferably a spring sheet, but it can also be a spring or a cantilever integrally formed with the first housing 10 and extending into the inner cavity 102.

[0052] like Figure 1 As shown, in a preferred embodiment, a first lens 20 connected to the first housing 1 can be provided below the lens 2. By changing the distance between the lens 2 and the first lens 20, zoom can be achieved.

[0053] It is understood that the camera module is not limited to including only one driving device; it can include multiple driving devices to drive the lens 2 to perform multi-stage telescopic movements. For example... Figure 6 As shown, Figure 6 The illustration shows one embodiment where the camera module further includes a second driving device 6. The second driving device 6 includes a second housing 60 and a second driving mechanism disposed within the second housing 60. The first driving device 1 is movably disposed within the second housing 60 and can move along the telescopic direction of the lens 2. The second driving mechanism is connected to the first housing 10 of the first driving device 1 and is used to drive the first driving device 1 to move. In this way, the lens 2 can be driven to telescopically by two driving devices respectively, resulting in better zoom effect. The structure of the second driving mechanism can refer to the first driving mechanism. For example, it may also include a second coil 61 wound around the outside of the first housing 10 and a second magnetic element 62 disposed within the second housing 60, with driving force provided by energizing the second coil 61.

[0054] The second drive mechanism is electrically connected to the control system and can drive the first drive device 1 to extend or retract under the control command of the control system. When the pressure sensor 3 senses compression, the control system preferably controls the first drive device 1 and the lens 2 to retract simultaneously. Since the longer the camera module extends, the greater the compressive force it experiences, and the larger the lever arm, the more easily internal components are deformed. Therefore, controlling the retraction of the lens 2 under multi-stage extension and retraction can provide a better protective effect.

[0055] Similarly, the camera module may also include a second lens 21 connected to the second housing 60. The distances between the lens 2, the first lens 20, and the second lens 21 can all be changed, making it easier to zoom and adjust the camera module to obtain better imaging results. In other embodiments, a filter can also be provided below the lens 2 for light filtering.

[0056] As a preferred embodiment, the structure of the signal processing circuit is as follows: Figure 7 As shown, it includes a positive input terminal IN+, a negative input terminal IN-, a preamplifier circuit 7, a single-ended amplifier circuit 70, a DC blocking circuit 71, a filter circuit 72, and an analog-to-digital converter (ADC).

[0057] The preamplifier circuit 7 includes operational amplifiers U1, U2, and U3.

[0058] Specifically, the non-inverting input terminal and the negative input terminal IN- of operational amplifier U1 are connected. Resistors R1 and R2 are connected in series between the inverting input terminal of operational amplifier U1 and the inverting input terminal of operational amplifier U2. Resistor R4 is connected between the inverting input terminal and the output terminal of operational amplifier U1. Resistor R5 is connected between the output terminal of operational amplifier U1 and the inverting input terminal of operational amplifier U3. A filter circuit 72 is installed between the non-inverting input terminal and the positive input terminal IN+ of operational amplifier U2. Resistor R3 is connected between the inverting input terminal and the output terminal of operational amplifier U2. Resistor R6 is installed between the output terminal of operational amplifier U2 and the non-inverting input terminal of operational amplifier U3. Resistor R8 is installed between the non-inverting input terminal and ground GND of operational amplifier U3. Resistor R7 is installed between the inverting input terminal and the output terminal of operational amplifier U3. In the preamplifier circuit 7, R1 = R2, R3 = R4, R5 = R6, and R7 = R8.

[0059] The filter circuit 72 includes a capacitor C1 and a resistor R12 connected in series between the positive input terminal IN+ and the non-inverting input terminal of the operational amplifier U2. The filter circuit 72 also includes a resistor R13 and a capacitor C2. One end of the resistor R13 is connected in the circuit between the capacitor C1 and the resistor R12, and the other end is connected to ground GND. One end of the capacitor C2 is connected to the non-inverting input terminal of the operational amplifier U2, and the other end is connected to ground GND.

[0060] The single-ended amplifier circuit 70 includes an operational amplifier U4. The non-inverting input terminal of the operational amplifier U4 is connected to the output terminal of the operational amplifier U3. A resistor R10 is connected between its inverting input terminal and its output terminal, and a resistor R9 is connected between its inverting input terminal and ground GND.

[0061] The DC blocking circuit 71 includes operational amplifier U5. A capacitor C3 is connected between the non-inverting input of operational amplifier U5 and the output of operational amplifier U4, and a resistor R11 is connected between its non-inverting input and the reference voltage VREF. The inverting input and output of operational amplifier U5 are directly connected. The output of operational amplifier U5 is connected to the analog-to-digital converter (ADC).

[0062] The positive input terminal IN+ and the negative input terminal IN- are connected to the flexible circuit board 5 to receive the electrical signal from the pressure sensor 3. The signal received at the positive input terminal is filtered by the filter circuit 72 and then input to the preamplifier 7. The signal is initially amplified by the preamplifier 7, and then enters the single-ended amplifier circuit 70 for further amplification. The signal after secondary amplification enters the DC blocking circuit 70. The DC blocking circuit 70 can add a DC bias to the AC signal passing through capacitor C3 via VREF, ensuring that the signal output from the DC blocking circuit 70 is only a positive level signal, facilitating subsequent analog-to-digital conversion. The analog-to-digital converter (ADC) is used to convert the analog signal into a digital signal. It is electrically connected to the main control chip, facilitating signal processing and calculation by the main control chip. By setting up a signal processing circuit to process the signal sensed by the pressure sensor 3, signal distortion can be reduced, ensuring that the main control chip can make accurate control commands based on the received signal, making the operation of the camera module more reliable.

[0063] The present invention also proposes an electronic device that includes the camera module described above. The electronic device may be, for example, a mobile phone, a tablet computer, or a camera.

[0064] This invention provides a lens cover connected to the first housing and a pressure sensor corresponding to the lens cover. When the phone is accidentally dropped and collided or squeezed by contact with other objects, the lens cover can apply pressure to the pressure sensor. Based on the sensing signal from the pressure sensor, the first driving mechanism can be controlled to drive the lens to retract into the first housing, thereby placing the lens in a safer position. This better protects the lens and the first driving mechanism, ensuring the reliability of the camera module.

[0065] The above is only one specific embodiment of the present invention, and any improvements made based on the concept of the present invention shall be considered within the scope of protection of the present invention.

Claims

1. A camera module, characterized in that, include: The first driving device (1) includes a first housing (10) and a first driving mechanism disposed within the first housing (10); Lens (2) is disposed inside the first housing (10) and connected to the first driving mechanism. The first driving mechanism is used to drive the lens (2) to extend or retract into the first housing (10). A pressure sensor (3) is connected to the first housing (10), and the first drive mechanism controls the lens (2) to retract into the first housing (10) according to the signal from the pressure sensor (3); and, The lens cover (4) is slidably coupled to the first housing (10) and covers the outside of the lens (2). The lens cover (4) can squeeze the pressure sensor (3) after being pressed. The first housing (10) includes an opening (101) for the lens (2) to extend out and an end face (1030) surrounding the outer periphery of the opening (101). The pressure sensor (3) is disposed on the end face (1030) and located between the lens cover (4) and the end face (1030). The lens cover (4) includes a cover body (40) connected to the opening (101). The cover body (40) is movably engaged with the opening (101) and can move a certain distance along the telescopic direction of the lens (2) to move toward the pressure sensor (3) and squeeze the pressure sensor (3).

2. The camera module as described in claim 1, characterized in that, The pressure sensor (3) includes a pressure sensing layer (30) connected to the first housing (10) and a protective layer (31) disposed on the surface of the pressure sensing layer (30).

3. The camera module as described in claim 1, characterized in that, The lens cover (4) is slidably engaged with the opening (101).

4. The camera module as described in claim 3, characterized in that, The pressure sensor (3) is one in number and surrounds the outer periphery of the opening (101); or, The number of pressure sensors (3) is multiple, and the multiple pressure sensors (3) cooperate to form a ring around the outer periphery of the mouth (101).

5. The camera module as described in claim 1, characterized in that, The first driving device (1) further includes a carrier (12) disposed inside the first housing (10) and connected to the first driving mechanism. The lens (2) is connected to the carrier (12). The first driving mechanism drives the lens (2) to move by driving the carrier (12).

6. The camera module as described in claim 1, characterized in that, It also includes a second drive device (6), which includes a second housing (60) and a second drive mechanism (61) disposed in the second housing (60). The first drive device (1) is disposed in the second housing (60) and connected to the second drive mechanism (61). The second drive mechanism (61) is used to drive the first drive device (1) to move along the telescopic direction of the lens (2).

7. The camera module as described in claim 1, characterized in that, The opening (101) is provided with a first protruding ring (1010) protruding outward, and the cover (40) includes a plate (400), an annular wall (401) connected to the plate (400), and a second protruding ring (402) protruding inward from the annular wall (401). The first protruding ring (1010) and the second protruding ring (402) are connected to each other.

8. The camera module as described in claim 7, characterized in that, A flexible layer (403) is provided between the first convex ring (1010) and the plate (400). The flexible layer (403) applies an elastic force to the cover (40) away from the pressure sensor (3). After being pressed, the lens protective cover (4) compresses the flexible layer (403) and squeezes the pressure sensor (3).

9. The camera module as described in any one of claims 1 to 8, characterized in that, It also includes a control system electrically connected to the pressure sensor (3) and the first drive mechanism, the control system issuing control commands to the first drive mechanism based on the signal from the pressure sensor (3).

10. The camera module as described in claim 9, characterized in that, The control system includes a signal processing circuit electrically connected to the pressure sensor (3) and a main control chip electrically connected to the signal processing circuit. The signal processing circuit includes an input positive terminal IN+, an input negative terminal IN-, a filter circuit (72) connected to the input positive terminal IN+, a preamplifier circuit (7) connected to the input negative terminal IN- and the filter circuit (72), a single-ended amplifier circuit (70) connected to the preamplifier circuit (7), a DC blocking circuit (71) connected to the single-ended amplifier circuit (70), and an analog-to-digital converter (ADC) connected to the DC blocking circuit (71).

11. The camera module as described in claim 10, characterized in that, The preamplifier circuit (7) includes operational amplifiers U1, U2, and U3. The non-inverting input terminal of operational amplifier U1 is connected to the negative input terminal IN-. Resistors R1 and R2 are connected in series between the inverting input terminal of operational amplifier U1 and the inverting input terminal of operational amplifier U2. Resistor R4 is connected between the inverting input terminal of operational amplifier U1 and its output terminal. Resistor R5 is connected between the output terminal of operational amplifier U1 and the inverting input terminal of operational amplifier U3. The filter circuit (72) is provided between the non-inverting input terminal and the positive input terminal IN+ of operational amplifier U2. Resistor R3 is connected between the inverting input terminal and its output terminal of operational amplifier U2. Resistor R6 is provided between the output terminal of operational amplifier U2 and the non-inverting input terminal of operational amplifier U3. Resistor R8 is provided between the non-inverting input terminal and ground GND of operational amplifier U3. Resistor R7 is provided between the inverting input terminal and its output terminal of operational amplifier U3. The filter circuit (72) includes a capacitor C1 and a resistor R12 connected in series between the positive input terminal IN+ and the non-inverting input terminal of the operational amplifier U2. The filter circuit (72) also includes a resistor R13 and a capacitor C2. One end of the resistor R13 is connected to the circuit between the capacitor C1 and the resistor R12, and the other end is connected to ground GND. One end of the capacitor C2 is connected to the non-inverting input terminal of the operational amplifier U2, and the other end is connected to ground GND. The single-ended amplifier circuit (70) includes an operational amplifier U4, the non-inverting input terminal of the operational amplifier U4 is connected to the output terminal of the operational amplifier U3, a resistor R10 is connected between its inverting input terminal and its output terminal, and a resistor R9 is connected between its inverting input terminal and ground GND. The DC blocking circuit (71) includes an operational amplifier U5. A capacitor C3 is connected between the non-inverting input terminal of the operational amplifier U5 and the output terminal of the operational amplifier U4. A resistor R11 is connected between the non-inverting input terminal of the operational amplifier U5 and the reference voltage VREF. The inverting input terminal of the operational amplifier U5 is connected to its output terminal. The output terminal of the operational amplifier U5 is connected to the analog-to-digital converter ADC.

12. An electronic device, characterized in that, Includes the camera module as described in any one of claims 1 to 11.

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