Electromagnetic pressing device, motor carrier self-locking device, camera module and electronic equipment

Abstract

The utility model relates to an electromagnetic pressing device, a motor carrier self-locking device, a camera module and electronic equipment. The driving unit comprises a magnet and an electromagnetic coil; the execution unit comprises an iron key, a limiting pin and a rotation limiting piece; the rotation limiting piece is fixed to the outer side of the magnet, and an unlocking groove and a self-locking groove are formed in the inner wall of the outer end of the rotation limiting piece. The iron key is arranged in the rotation limiting piece, when the magnetic pole generated by electrification of the electromagnetic coil is the same as the magnetic pole of the magnet, the iron key moves in the direction away from the magnet under repulsive force, and a plurality of triangular heads which are uniformly distributed in the circumferential direction are arranged at the outer end of the iron key; one end of the limiting pin extends into the iron key, a plurality of guide blocks extending in the axial direction of the limiting pin are arranged in the middle of the limiting pin, and the ends, close to the iron key, of the guide blocks are provided with slopes matched with the triangular head. And the return unit is used for resetting the limiting pin. According to the utility model, the water ripple phenomenon of the motor under high-frequency vibration can be relieved or eliminated, and the energy consumption is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to camera module technical field, concretely relates to a kind of electromagnetic pressing device, motor carrier self-locking device, camera module and electronic equipment. BACKGROUND

[0002] With the rapid development of mobile communication technology and the continuous improvement of smart phone penetration rate, as an important tool for recording life and sharing instant, the performance requirement of mobile phone camera is increasingly strict. Among many camera performance indicators, the stability and clarity of video recording are one of the key factors, which directly affect user experience. In order to realize high-quality video recording, the performance optimization of voice coil motor (VCM for short) inside mobile phone camera, which is a driving component, is particularly important.

[0003] VCM motor drives lens to move quickly and accurately through electromagnetic principle, which is the core component to realize automatic focusing, optical image stabilization and other functions. However, in actual application, especially when VCM motor is in high-frequency vibration state for recording, a phenomenon called "water ripples" often occurs. This phenomenon is specifically manifested as periodic light and dark stripe fluctuation in video image, which seriously affects the smoothness and watchability of video.

[0004] Through analysis, the generation of water ripple phenomenon is closely related to the design of spring sheet inside VCM motor. As a bridge connecting lens assembly and driving structure, the mechanical characteristics of spring sheet directly affect the vibration characteristics and stability of motor. Specifically, the stiffness (usually represented by K value) of spring sheet is a key factor affecting water ripple phenomenon. The smaller the K value is, the more likely the spring sheet deforms under stress, resulting in more obvious jitter under high-frequency vibration and aggravating water ripple phenomenon; on the contrary, the increase of K value reduces the deformation of spring sheet, which theoretically should reduce the occurrence of water ripple.

[0005] However, it is not a panacea to solve water ripple problem by simply increasing K value. Because the increase of K value is accompanied by the decrease of spring sheet deformation ability, in order to achieve the same lens displacement, it is necessary to exert greater Lorentz force. This means that either the volume or magnetic strength of magnet needs to be increased, or the size of coil needs to be increased, or the strength of driving current needs to be increased. The adjustment of these parameters is not only directly related to the size design of VCM motor, which increases the difficulty of design and manufacturing, but also puts forward higher requirements for the power consumption of motor, which is not conducive to the improvement of overall energy efficiency of mobile phone and the extension of battery life.

[0006] Therefore, how to effectively alleviate or eliminate water ripple phenomenon of VCM motor under high-frequency vibration without sacrificing power consumption has become a technical problem to be solved in current mobile phone camera industry. SUMMARY

[0007] The electromagnetic pressing device, the motor carrier self-locking device, the camera module and the electronic equipment can effectively alleviate or eliminate the water ripple phenomenon of the motor under high-frequency vibration and have low power consumption.

[0008] In a first aspect, the electromagnetic pressing device comprises:

[0009] A shell;

[0010] A driving unit arranged in the shell and comprising a magnet and an electromagnetic coil, wherein the electromagnetic coil generates a magnetic pole after being electrified, and the magnetic pole repels the magnet;

[0011] An execution unit arranged in the shell and comprising an iron key, a limiting pin and a rotating limiting piece, wherein the rotating limiting piece is fixed to the outside of the magnet, and an unlocking groove and a self-locking groove extending along the axial direction are arranged on the inner wall of the outer end of the rotating limiting piece; the iron key is arranged in the rotating limiting piece, and when the magnetic pole generated by the electromagnetic coil is the same as the magnetic pole of the magnet, the iron key moves away from the magnet under the repulsion force, and the outer end of the iron key is provided with a plurality of circumferentially distributed triangular heads; one end of the limiting pin extends into the iron key, a plurality of guide blocks extending along the axial direction are arranged on the middle part of the limiting pin, and the end of the guide block close to the iron key is provided with an inclined surface matched with the triangular head; the triangular head and the inclined surface are slidably matched, the limiting pin is pushed to move along the axial direction and extends out of the shell, and the guide blocks of the limiting pin are switched between the unlocking groove and the self-locking groove to realize the locking or unlocking of the execution unit.

[0012] A return unit arranged in the shell and used for resetting the limiting pin when the execution unit is unlocked and the driving unit stops acting.

[0013] Optionally, the magnet is located at the bottom end of the shell, and the electromagnetic coil is sleeved on the rotating limiting piece.

[0014] Optionally, the outer end of the iron key is provided with eight triangular heads, four guide blocks are arranged on the limiting pin, and four self-locking grooves and four unlocking grooves are arranged on the rotating limiting piece, and the self-locking grooves and the unlocking grooves are alternately arranged.

[0015] Optionally, eight axially extending limiting rods are further arranged on the outer periphery of the iron key, eight first limiting grooves are arranged on the rotating limiting piece, and the eight limiting rods and the eight first limiting grooves are one-to-one correspondingly arranged to ensure that the iron key can only move forward and backward relative to the rotating limiting piece.

[0016] Optionally, the return unit comprises:

[0017] A spring is sleeved on the outer end of the limiting pin;

[0018] A spring limiting member is arranged in the shell and located outside the rotation limiting member,

[0019] The outer end of the spring limiting member is provided with a first spring limiting step;

[0020] The middle part of the limiting pin is provided with a second spring limiting step;

[0021] The spring is located between the first spring limiting step and the second spring limiting step.

[0022] In a second aspect, the utility model provides a motor carrier self-locking device, comprising:

[0023] A second limiting groove is arranged on the outer wall of the motor carrier;

[0024] The second limiting groove is opposite to the limiting pin of the electromagnetic pressing device.

[0025] In a third aspect, the utility model provides a camera module, which adopts the motor carrier self-locking device.

[0026] In a fourth aspect, the utility model provides an electronic device, which adopts the camera module.

[0027] The utility model has the following advantages:

[0028] (1) the electromagnetic pressing device provided by the utility model only needs to be powered for a short time (for example, within 1S), and the rotation limiting member can be locked to the limiting pin to realize self-locking, without being powered all the time; when unlocking, only a short time is needed to be powered, and the limiting pin is driven to return to the original position through the return unit after unlocking, so that the energy consumption is very low.

[0029] (2) the camera module provided by the utility model can lock the motor carrier and fix the lens at a fixed position when high-frequency vibration occurs, so that the resonance caused by high-frequency vibration can be eliminated, and the problem of "water ripples" in the video shooting under high-frequency vibration can be effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a structure diagram of the electromagnetic pressing device in the embodiment of the application;

[0031] Figure 2 It is a structure diagram of the rotation limiting member in the embodiment of the application;

[0032] Figure 3The structure schematic view of the iron key in the embodiment of the application is shown in the figure.

[0033] Figure 4 The structure schematic view of the limiting pin in the embodiment of the application is shown in the figure.

[0034] The label of the figure is explained as follows:

[0035] In the figure: 1, the shell, 2, the magnet, 3, the electromagnetic coil, 4, the rotation limiting piece, 41, the self-locking groove, 42, the unlocking groove, 43, the first limiting groove, 5, the iron key, 51, the triangular head, 52, the limiting rod, 6, the limiting pin, 61, the guide block, 62, the inclined surface, 63, the second spring limiting step, 7, the spring, 8, the spring limiting piece, 81, the first spring limiting step, 9, the motor carrier, 91, the second limiting groove. DETAILED DESCRIPTION

[0036] The implementation of the technical scheme of the application will be explained below with reference to the figures and the preferred embodiments, and the other advantages and effects of the application can be easily understood by the person skilled in the art from the content disclosed in the specification. The application can also be implemented or applied in other different specific embodiments, and each detail in the specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the application. It should be understood that the preferred embodiments are only for explaining the application, and are not intended to limit the protection scope of the application.

[0037] As Figures 1 to 4As shown in the embodiment of this application, an electromagnetic pressing device includes a housing 1, a driving unit, an execution unit, and a return unit. The driving unit is disposed inside the housing 1 and includes a magnet 2 and an electromagnetic coil 3. When the electromagnetic coil 3 is energized, it generates magnetic poles, which generate a repulsive force with the magnet 2. The execution unit is disposed inside the housing 1 and includes an iron button 5, a limiting pin 6, and a rotation limiting member 4. The rotation limiting member 4 is fixed to the outside of the magnet 2, and an unlocking groove 42 and a self-locking groove 41 extending axially are provided on the inner wall of the outer end of the rotation limiting member 4. The iron button 5 is disposed inside the rotation limiting member 4. When the magnetic poles generated by the electromagnetic coil 3 are energized are the same as the magnetic poles of the magnet 2, the iron button 5 is repulsed and moves away from the magnet 2. The outer end of the iron button 5 is provided with a plurality of circumferentially distributed triangular heads 51. One end of the limiting pin 6 extends into the iron button 5. The middle of the limiting pin 6 is provided with multiple guide blocks 61 extending axially. The end of the guide block 61 near the iron button 5 has a bevel 62 that engages with the triangular head 51. Through the sliding engagement (line-surface contact) between the triangular head 51 and the bevel 62, the limiting pin 6 is pushed axially and extends out of the housing 1. This also allows the guide block 61 of the limiting pin 6 to switch between the unlocking groove 42 and the self-locking groove 41, thereby locking or unlocking the execution unit. A return unit is located inside the housing 1 and is used to reset the limiting pin 6 when the execution unit is unlocked and the drive unit stops operating.

[0038] like Figure 1 and Figure 2 As shown, in one possible embodiment, the magnet 2 is located at the bottom end of the outer casing 1; the electromagnetic coil 3 is sleeved on the rotation limit member 4.

[0039] like Figure 3 As shown, in one possible embodiment, the outer end of the iron button 5 is provided with eight triangular heads 51, and the eight triangular heads 51 are evenly distributed circumferentially.

[0040] like Figure 4 As shown, in one possible embodiment, the limiting pin 6 is provided with four guide blocks 61, and the four guide blocks 61 are evenly distributed circumferentially.

[0041] like Figure 2 As shown, the rotation limiter 4 is provided with four self-locking grooves 41 and four unlocking grooves 42, and the self-locking grooves 41 and unlocking grooves 42 are arranged alternately in pairs.

[0042] like Figure 3 As shown, in one possible embodiment, the outer periphery of the iron button 5 is also provided with eight axially extending limiting rods 52, and the rotation limiting member 4 is provided with eight first limiting grooves 43. The eight limiting rods 52 are respectively arranged in a one-to-one correspondence with the eight first limiting grooves 43 to ensure that the iron button 5 can only move back and forth relative to the rotation limiting member 4.

[0043] likeFigure 2 As shown, in one possible embodiment, both the self-locking groove 41 and the unlocking groove 42 are beveled grooves, so that the guide block 61 on the limiting pin 6 can switch between the self-locking groove 41 and the unlocking groove 42.

[0044] like Figure 1 As shown, in one possible embodiment, the return unit includes a spring 7 and a spring limiting member 8; the spring 7 is sleeved on the outer end of the limiting pin 6; the spring limiting member 8 is disposed inside the housing 1 and located outside the rotation limiting member 4. The outer end of the spring limiting member 8 is provided with a first spring limiting step 81; the middle part of the limiting pin 6 is provided with a second spring limiting step 63; the spring 7 is located between the first spring limiting step 81 and the second spring limiting step 63.

[0045] like Figure 1 As shown in the embodiment of this application, a motor carrier self-locking device includes a second limiting groove 91 and an electromagnetic pressing device in this embodiment of the application. The second limiting groove 91 is disposed on the outer side wall of the motor carrier 9; and the second limiting groove 91 is directly opposite to the limiting pin 6 of the electromagnetic pressing device.

[0046] like Figure 1 As shown, the working principle of this motor carrier self-locking device is as follows:

[0047] (1) When the device is started, assuming that the magnet 2 is set as the S pole, the electromagnetic coil 3 will also generate an S pole magnetic field after being energized. Due to the principle of repulsion between like magnetic poles, the iron button 5 is repelled and moves towards the motor carrier 9, and drives the limit pin 6 to move synchronously.

[0048] (2) As the limiting pin 6 extends out of the outer casing 1 and accurately inserts into the second limiting groove 91 of the motor carrier 9, the guide block 61 on it switches from the unlocking groove 42 to the self-locking groove 41 (at the moment when the triangular head 51 of the iron button 5 pushes the guide block 61 of the limiting pin 6 out of the unlocking groove 42, the limiting pin 6 can rotate because there is no restriction of the unlocking groove 42. As the triangular head 51 pushes the inclined surface 62 of the guide block 61 on one side, at the same time, with the auxiliary force of the spring 7, the guide block 61 slides smoothly and directly into the self-locking groove 41). At this time, the limiting pin 6 is firmly locked in the second limiting groove 91, realizing the fixed locking of AF (autofocus mechanism). Even if the electromagnetic coil 3 is subsequently de-energized, the limiting pin 6 can still maintain the fixed state of AF, effectively preventing the lens assembly from shaking or moving. This design can lock the motor carrier 9 in a high-frequency vibration environment, making the lens stable in a fixed position, thereby eliminating the resonance phenomenon caused by high-frequency vibration and solving the "water ripple" problem that occurs when shooting video.

[0049] (3) After the electromagnetic coil 3 is de-energized, it loses its magnetism, and the iron button 5 returns to its original position due to the attraction of the magnet 2.

[0050] (4) When the electromagnetic coil 3 is powered again, the iron key 5 and the limit pin 6 are again moved to the motor carrier 9 side under the action of the magnetic force, and the guide block 61 is switched from the self-locking groove 41 to the unlocking groove 42 (the principle is the same as that of switching from the unlocking groove 42 to the self-locking groove 41).

[0051] (5) After the electromagnetic coil 3 is powered off again, the iron key 5 is again attracted back to the original position by the magnet 2, and the limit pin 6 moves to the magnet 2 side under the action of the elastic force of the spring 7, and finally returns to the initial position. At this time, the limit pin 6 exits from the second limit groove 91, and the AF returns to the movable state.

[0052] The advantage of the motor carrier self-locking device is that power consumption only occurs during the short period when the electromagnetic coil 3 is powered on and drives the limit pin 6 to move, and no power consumption occurs during the rest of the time, so the overall energy consumption is low.

[0053] As shown in Figure 1 , in an embodiment of the present application, a camera module adopts the motor carrier self-locking device as in the embodiment of the present application.

[0054] In an embodiment of the present application, an electronic device adopts the camera module as in the embodiment of the present application.

[0055] In the embodiment of the present application, the term "high frequency" does not have an absolute and unified definition, because it depends on multiple factors, including the response speed of the anti-shake system, the sensitivity of the sensor, and the requirements for anti-shake performance in a specific application scenario. In general, vibrations can be considered as high-frequency vibrations when the jitter information is greater than or equal to a preset jitter threshold (obtained according to calibration).

[0056] The above embodiments are the preferred embodiments of the present application, but the embodiments of the present application are not limited by the above embodiments, and any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present application are equivalent replacement methods, and are all included in the protection scope of the present application.

Claims

1. An electromagnetic pressing device, characterized by, The utility model relates to a kind of magnetic key, including: Shell (1); Driving unit, be arranged in the shell (1), including magnet (2) and electromagnetic coil (3), the electromagnetic coil (3) generates magnetic pole after being energized, and the same sex repulsion force is generated with the magnet (2);Execution unit, be arranged in the shell (1), including iron key (5), limit pin (6) and rotation limiting piece (4);The rotation limiting piece (4) is fixed in the outside of the magnet (2), and is equipped with the unlocking slot (42) and self-locking slot (41) on the inner wall of the outer end portion of rotation limiting piece (4) along its axial direction;The iron key (5) is arranged in the rotation limiting piece (4), when the magnetic pole generated by the electromagnetic coil (3) is the same with the magnetic pole of the magnet (2), the iron key (5) is repelled by force and moves in the direction away from the magnet (2), and the outer end of the iron key (5) is equipped with multiple circumferentially distributed triangular head (51);The limit pin (6) one end extends into the iron key (5), and the middle part of the limit pin (6) is equipped with multiple axial direction extending guide block (61), and the guide block (61) one end close to the iron key (5) is equipped with the inclined surface (62) with the triangular head (51) cooperation, by the triangular head (51) and the inclined surface (62) sliding fit, the limit pin (6) is pushed and moves along its axial direction and extends to the outside of shell (1), and the guide block (61) of the limit pin (6) is switched between the unlocking slot (42) and self-locking slot (41), to realize the locking or unlocking of execution unit; Return unit, be arranged in the shell (1), for when execution unit is in unlocking, and driving unit stops acting, limit pin (6) resets. The magnet (2) is located at the bottom end of the shell (1);The electromagnetic coil (3) is sleeved on the rotation limiting piece (4).

2. The electromagnetic pressing device according to claim 1, characterized in that: The outer end of the iron key (5) is equipped with eight triangular heads (51);The limit pin (6) is equipped with four guide blocks (61);The rotation limiting piece (4) is equipped with four self-locking slots (41) and four unlocking slots (42), and the self-locking slots (41) and the unlocking slots (42) are alternately arranged.

3. The electromagnetic pressing device of claim 1, wherein: The outer circumference of the iron key (5) is also equipped with eight axial direction extending limit rods (52), and the rotation limiting piece (4) is equipped with eight first limit grooves (43), and eight limit rods (52) are arranged one by one with eight first limit grooves (43) to ensure that the iron key (5) can only move forward and backward relative to the rotation limiting piece (4).

4. The electromagnetic pressing device of claim 1, wherein: The return unit includes:

5. The electromagnetic pressing device of claim 1, wherein Spring (7), is sleeved on the outer end portion of the limit pin (6); Spring limiting piece (8), be arranged in the shell (1) and be located at the outside of the rotation limiting piece (4), The outer end of the spring limiting piece (8) is equipped with first spring limiting step (81); The middle part of the limit pin (6) is equipped with second spring limiting step (63); The spring (7) is located between the first spring limiting step (81) and the second spring limiting step (63). Including:

6. A motor carrier self-locking device, characterized by, ​ A second limiting groove (91) is arranged on the outer side wall of the motor carrier (9); The electromagnetic pressing device according to any one of claims 1 to 5, and the second limiting groove (91) is opposite to the limiting pin (6) of the electromagnetic pressing device.

7. An image capture module, comprising: The motor carrier self-locking device according to claim 6 is adopted.

8. An electronic device, comprising: The camera module according to claim 7 is adopted.

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