CN106686292B - A kind of camera module and mobile terminal - Google Patents

Abstract

A kind of voice coil motor of present invention offer, camera module and mobile terminal, wherein, voice coil motor includes stator, mover and pedestal, the mover is oppositely arranged with the pedestal, the limit body for limiting the mover displacement distance is provided on the pedestal or on the mover, the limit body is conductive, and the limit body and a power supply are electrically connected, and height of the limit body when first is electrically connected state is less than height of the limit body when second is electrically connected state.The embodiment of the present invention can make the mover of voice coil motor have larger displacement distance in the operating condition, to ensure the normal work of voice coil motor；And make mover that there is smaller displacement distance in a non-operative state, play the role of limiting mover movement when voice coil motor is by external impacts.The embodiment of the present invention may be implemented to reduce the purpose of existing voice coil motor integral thickness.

Description

A camera module and mobile terminal

technical field

The invention relates to the technical field of communications, in particular to a camera module and a mobile terminal.

Background technique

Voice Coil Motor (Voice Coil Motor) is a device that uses the interaction between the magnetic field of the magnet and the magnetic poles in the magnetic field generated by the energized coil to generate regular motion. Voice coil motors are widely used in systems that require precise positioning, such as focusing of cameras, packaging of chips, detection of key switches, etc.

In addition to providing sufficient moving distance for the mover, the voice coil motor also needs to ensure that the voice coil motor has a sufficient safety distance in the event of external impact or drop, which makes the overall thickness of the voice coil motor thick. Taking the camera module used by the voice coil motor in the mobile terminal as an example, in order to enable the camera module to achieve close-range and long-range focus, and to prevent the lens from hitting the photosensitive chip when the camera module is impacted by external force or falls, the camera module needs to reserve enough The lens movement distance and sufficient safety distance.

Currently, as the overall thickness of the mobile terminal becomes thinner, the overall thickness of the camera module will affect the overall appearance and feel of the mobile terminal. It can be seen that how to reduce the overall thickness of the voice coil motor has become an urgent problem to be solved.

Contents of the invention

Embodiments of the present invention provide a voice coil motor, a camera module and a mobile terminal to reduce the overall thickness of the existing voice coil motor.

In the first aspect, the embodiment of the present invention provides a voice coil motor, including a stator, a mover and a base, the mover is arranged opposite to the base, and the base and/or the mover are provided with A limiting body that limits the moving distance of the mover, the limiting body has conductivity, the limiting body is electrically connected to a power supply, and the height of the limiting body in the first electrically connected state is smaller than the The height of the limiting body in the second electrical connection state.

In the second aspect, the embodiment of the present invention also provides a camera module, including a lens, a photosensitive chip, and a voice coil motor. The voice coil motor includes a stator, a mover, and a base, and the lens is clamped on the voice coil The inner side wall of the mover of the motor, the mover is arranged opposite to the base, the base or the mover is provided with a limit body for limiting the moving distance of the mover, the limit body has Conductivity, the limiting body is electrically connected to a power supply, and the height of the limiting body in the first electrical connection state is smaller than the height of the limiting body in the second electrical connection state.

In the third aspect, the embodiment of the present invention also provides a mobile terminal, including a camera module, the camera module includes a lens, a photosensitive chip, and a voice coil motor, and the voice coil motor includes a stator, a mover, and a base. The lens is clamped on the inner side wall of the mover of the voice coil motor, the mover is arranged opposite to the base, and the base or the mover is provided with a limiter for limiting the moving distance of the mover. A positioner, the limiter has conductivity, the limiter is electrically connected to a power supply, and the height of the limiter in the first electrical connection state is smaller than that of the limiter in the second electrical connection state. Height when connected.

In the embodiment of the present invention, a limit body that limits the moving distance of the mover is provided in the voice coil motor, and the limit body has characteristics of different heights under different electrical connection states, so that the mover of the voice coil motor can In the working state, it has a large moving distance to ensure the normal operation of the voice coil motor; while in the non-working state, the mover has a small moving distance to limit the movement of the mover when the voice coil motor is impacted by external force role. It can be seen that the embodiment of the present invention can achieve the purpose of reducing the overall thickness of the existing voice coil motor.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments of the present invention. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

FIG. 1 is a schematic diagram of an assembly structure of a voice coil motor provided by an embodiment of the present invention;

2 is a schematic diagram of the overall structure of the camera module provided by the embodiment of the present invention;

Fig. 3 is a top view of the camera module provided by the embodiment of the present invention;

Fig. 4 is a B-B sectional view of the camera module in Fig. 3;

5 is a schematic structural view of a carrier of a voice coil motor provided by an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a base of a voice coil motor provided by an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

first embodiment

As shown in Figure 1, a voice coil motor 10 includes a stator 1, a mover 2 and a base 3, the mover 2 is arranged opposite to the base 3, and the base 3 or the mover 2 is provided with a motor for limiting the moving distance of the mover 2 The limiting body 4 has electrical conductivity, the limiting body 4 is electrically connected to a power supply, and the height of the limiting body 4 in the first electrical connection state is smaller than that of the limiting body 4 in the second electrical connection state. state height.

The voice coil motor is a device that uses the interaction between the magnetic field of the magnet and the magnetic poles in the magnetic field generated by the energized coil to generate regular motion. One of them is used as a stator, and the other is used as a mover to realize the conversion of electrical energy to mechanical energy of the voice coil motor.

Wherein, as shown in FIG. 1 , the stator 1 of the voice coil motor 10 may be a magnet, and the mover 2 of the voice coil motor 10 may be a coil 21 electrically connected to a power source. In addition, the mover 2 can also be composed of a coil 21 and a carrier 22 , wherein the coil 21 is embedded in the carrier 22 , and the carrier 22 is arranged opposite to the base 3 . Both the carrier 22 and the base 3 are insulating materials, such as LCP (liquid-crystal polymer, liquid crystal polymer) plastic material.

In addition, as shown in FIG. 1 , the voice coil motor 10 may further include a casing 5 , and the stator 1 may be fixedly disposed on the casing 5 . In addition, the voice coil motor 10 may not be provided with a separate housing 5 , but the stator 1 may be used as the housing of the voice coil motor 10 at the same time. Generally speaking, the voice coil motor 10 needs to be provided with a separate casing 5, and the material of the casing 5 can be metal or LCP plastic or other materials.

In addition, as shown in FIG. 1 , the voice coil motor 10 can also include a first elastic piece 6 and a second elastic piece 7, wherein the first elastic piece 6 can be arranged between the base 3 and the mover 2, and the second elastic piece 7 can be arranged on the Between the mover 2 and the housing 5. In this way, the mover 2 can be fixed by the first elastic piece 6 and the second elastic piece 7, and the elastic force of the first elastic piece 6 and the second elastic piece 7 can make the mover 2 move more smoothly, preventing the mover 2 from being deflected when moving in a straight line. shift.

Voice coil motors are widely used in systems that require precise positioning, such as focusing of cameras, packaging of chips, detection of key switches, etc. For ease of understanding, the embodiments of the present invention are described by taking a voice coil motor applied to a camera module of a mobile terminal as an example.

As shown in Figures 2 to 4, the camera module of the mobile terminal includes a lens 8, a photosensitive chip 9 and a voice coil motor 10, wherein the lens 8 is clamped on the inner wall of the mover 2 of the voice coil motor 10, or the camera The lens 8 of the module is clamped on the inner wall of the carrier 22 of the voice coil motor 10, and the coil 21 is embedded in the carrier 22. The carrier 22 and the coil 21 are used as the mover 2 of the voice coil motor 10, and the lens 8 is driven up and down by the thrust of the magnet. Move to achieve optical focus. In order to enable the camera module to achieve close-view and long-view focusing, it is necessary to provide sufficient moving distance for the lens 8 .

The photosensitive chip 9 of the camera module is arranged under the base 3 of the voice coil motor 10. When the camera module is impacted by an external force in a natural state, the lens 8 may move in the direction of the photosensitive chip 9. In order to prevent the lens 8 from colliding with the photosensitive chip 9 and cause The photosensitive chip 9 is broken, and a sufficient safety distance needs to be kept between the lens 8 and the photosensitive chip 9 .

In addition, during the reliability drop test, if the carrier 22 and the base 3 are made of LCP plastic material, the carrier 22 collides with the base 3 to easily generate debris, which will fall onto the photosensitive chip 9 and cause black spots to be photographed. The impact between the carrier 22 and the base 3 may crack the carrier 22 or the base 3 , and for the voice coil motor 10 provided with elastic pieces, the elastic pieces may also be broken.

If the moving distance of the lens 8 is A and the safety distance of the lens 8 is B, then the maximum distance between the lens 8 and the photosensitive chip 9 of the camera module is at least the sum of A and B.

In the embodiment of the present invention, in order to reduce the maximum distance between the lens 8 and the photosensitive chip 9, or in other words, to reduce the thickness of the voice coil motor 10, a device for limiting the moving distance of the mover 2 can be set on the base 3 or the mover 2 The limiting body 4, if the mover 2 includes a coil 21 and a carrier 22, the limiting body 4 can be arranged on the base 3 or the carrier 22. The limiting body 4 has electrical conductivity, and the limiting body 4 is electrically connected to a power source. The height of the limiting body 4 in the first electrically connected state is smaller than the height of the limiting body 4 in the second electrically connected state.

Wherein, the limiter 4 can be a conductive shape memory material, for example, it can be a shape memory metal or a conductive shape memory polymer, wherein the shape memory metal can be titanium-nickel alloy, copper-zinc alloy, copper-aluminum alloy Any one of nickel alloy, copper-molybdenum-nickel alloy and copper-gold-zinc alloy.

Wherein, the first electrical connection state may be the state when the limiter 4 is connected to the power supply (or the state when the limiter 4 is disconnected from the power supply), and the second electrical connection state may be the state when the limiter 4 is connected to the power supply. The state when it is disconnected (or the state when the limiting body 4 is connected to the power supply), the specific conditions corresponding to different shape memory materials may be different. In addition, the height (or volume) of the limiting body 4 when it is connected to the power supply may also be related to the magnitude of the current flowing inside. In this way, the power supply that can provide the corresponding current can be selected according to the specific situation.

Taking the camera module as an example, when the camera module is working, that is, when shooting, in order to realize the focus of the close-up and the distant view, the lens 8 needs to have a sufficient moving distance for focusing, that is to say, the mover 2 must have a sufficient moving distance; After the shooting is completed, in order to prevent the lens 8 from being impacted by an external force and moving toward the photosensitive chip 9 , the movement of the mover 2 needs to be limited by the limiting body 4 . That is to say, when the camera module works, the height (or volume) of the limiting body 4 needs to be reduced (or smaller); when the camera module stops working, the height (or volume) of the limiting body 4 needs to be increased .

For the case where the first electrical connection state is the state when the limiter 4 is connected to the power supply, and the second electrical connection state is the state when the limiter 4 is disconnected from the power supply, when the camera module is working, The limiting body 4 needs to be powered on; when the camera module stops working, the limiting body 4 needs to be disconnected from the power supply. For the opposite situation, when the camera module is working, the limiter 4 needs to be powered off; when the camera module stops working, the limiter 4 needs to be powered on.

Preferably, the first electrical connection state is the state when the limiting body 4 is connected to the power supply, and the second electrical connection state is the state when the limiting body 4 is disconnected from the power supply.

If in the existing camera module, the moving distance of the lens 8 is A, and the safety distance of the lens 8 is B. Then, in the embodiment of the present invention, since the movement of the mover 2 is restricted by the limiting body 4, the safety distance of the lens 8 can be smaller than B. In this way, the maximum distance between the lens 8 and the photosensitive chip 9 of the camera module according to the embodiment of the present invention is less than the sum of A and B. If the height (or volume) of the limiter 4 can be increased to limit the moving distance of the mover 2 to zero when the power supply is disconnected, then the distance between the lens 8 and the photosensitive chip 9 of the camera module of the embodiment of the present invention The maximum distance between can be equal to A. It can be seen that the thickness of the voice coil motor 10 in the embodiment of the present invention is effectively reduced.

In addition, the limiting body 4 can be embedded with a shape memory material when the base 3 or the carrier 22 is injection molded through an insert molding process. The electrical connection circuit between the limiting body 4 and a power source can be disposed inside the base 3 or the carrier 22 through LDS (Laser Direct Structuring, laser direct structuring) technology.

In the embodiment of the present invention, the change in height (or volume) of the limiter 4 under different electrical connection states is used to limit the structure of the mover 2 of the voice coil motor 10 when its height (or volume) increases , to reduce the distance from the lens 8 to the photosensitive chip 9. It can be seen that the embodiment of the present invention can not only effectively reduce the overall thickness of the voice coil motor 10, but also buffer the momentary impact between the carrier 22 and the base 3, reducing the force on the carrier 22, the base 3 or the shrapnel , and prevent the carrier 22 from colliding with the base 3 to generate debris.

Optionally, as shown in Figures 5 to 6, the mover 2 is provided with a first limiting body 41, the base 3 is provided with a second limiting body 42, and the first limiting body 41 and the second limiting body 42 is arranged opposite to each other, and the first limiting body 41 and the second limiting body 42 are jointly used to limit the moving distance of the mover 2 .

Wherein, as shown in FIG. 5 , when the mover 2 includes a coil 21 and a carrier 22 , the first limiting body 41 may be disposed on the carrier 22 .

Optionally, the first limiting body 41 is embedded on the mover 2 , and the second limiting body 42 is embedded on the base 3 .

In addition to the first limiter 41 and the second limiter 42 can be directly arranged on the surface of the mover 2 and the base 3, the first limiter 41 and the second limiter 42 can also be embedded in the mover 2 and the base respectively. 3, that is, one end of the first limiting body 41 is embedded in the mover 2, and one end of the second limiting body 42 is embedded in the base 3. Wherein, the embedding method can make the combination of the first limiting body 41 (or the second limiting body 42 ) and the mover 2 (or the base 3 ) more firm.

Optionally, as shown in FIGS. 5 to 6 , the first limiting body 41 includes at least two limiting units respectively arranged on two opposite sides of the mover 2 , and the second limiting body 42 includes at least two limiting units respectively arranged on Limiting units on two opposite sides of the base 3 .

In this way, the acting force between the mover 2 and the base 3 of the entire voice coil motor 10 can be more balanced.

Optionally, the circuit electrically connecting the first limiting body 41 to the power supply is arranged inside the mover 2 , and the circuit electrically connecting the second limiting body 42 to the power supply is arranged inside the base 3 .

second embodiment

As shown in Figures 2 to 4, a camera module includes a lens 8, a photosensitive chip 9 and a voice coil motor 10, wherein the voice coil motor 10 includes a stator 1, a mover 2 and a base 3, and the mover 2 and the base 3 are oppositely arranged, and the base 3 or the mover 2 is provided with a limiter 4 for limiting the moving distance of the mover 2. The limiter 4 has conductivity, and the limiter 4 is electrically connected to a power supply. The limiter 4 The height in the first electrical connection state is smaller than the height of the limiter 4 in the second electrical connection state; wherein, the lens 8 is clamped on the inner wall of the mover 2 of the voice coil motor 10 .

The specific structure of the voice coil motor 10 is the same as that of the first embodiment, and in order to avoid repetition, the embodiment of the present invention will not be repeated.

third embodiment

As shown in Figures 2 to 4, a mobile terminal includes a camera module and a printed circuit board 11, the camera module is arranged on the printed circuit board 11 and is electrically connected to the printed circuit board 11, wherein the camera module includes Lens 8, photosensitive chip 9 and voice coil motor 10, voice coil motor 10 includes stator 1, mover 2 and base 3, mover 2 is arranged opposite to base 3, and base 3 or mover 2 is provided with for limiting mover 2 The limit body 4 of the moving distance, the limit body 4 has conductivity, the limit body 4 is electrically connected to a power supply, and the height of the limit body 4 in the first electrical connection state is smaller than that of the limit body 4 in the second state. The height when it is electrically connected; the lens 8 is clamped on the inner wall of the mover 2 of the voice coil motor 10 .

The specific structure of the voice coil motor 10 is the same as that of the first embodiment, and in order to avoid repetition, the embodiment of the present invention will not be repeated.

Mobile terminals can include any of: mobile phones, tablet computers, e-book readers, MP3 players, MP4 players, digital cameras, laptop computers, vehicle computers, desktop computers, set-top boxes, smart TVs, and wearable devices one item.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the present invention, and should cover all Within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (9)

1. A voice coil motor comprises a stator, a rotor and a base, wherein the rotor is arranged opposite to the base, and the voice coil motor is characterized in that a limiting body used for limiting the moving distance of the rotor is arranged on the base and/or the rotor, the limiting body has conductivity, the limiting body is electrically connected with a power supply, and the height of the limiting body in a first electrical connection state is smaller than that of the limiting body in a second electrical connection state; wherein,

the first electrical connection state is a state when the limiting body is connected with a power supply, and the second electrical connection state is a state when the limiting body is disconnected with the power supply;

the mover has a large moving distance in an operating state, and the mover has a small moving distance in a non-operating state.

2. The voice coil motor of claim 1, wherein a first position-limiting body is disposed on the mover, a second position-limiting body is disposed on the base, the first position-limiting body and the second position-limiting body are disposed opposite to each other, and the first position-limiting body and the second position-limiting body are used together to limit a moving distance of the mover.

3. The voice coil motor of claim 2, wherein the first position-limiting body is embedded on the mover, and the second position-limiting body is embedded on the base.

4. The voice coil motor of claim 2, wherein the first position-limiting body comprises at least two position-limiting units respectively disposed on two opposite sides of the mover, and the second position-limiting body comprises at least two position-limiting units respectively disposed on two opposite sides of the base.

5. The voice coil motor of claim 1, wherein the stopper is made of a shape memory material having conductivity.

6. The voice coil motor of claim 1, further comprising a housing, a first resilient piece, and a second resilient piece, wherein the stator is fixedly disposed on the housing, the first resilient piece is disposed between the base and the mover, and the second resilient piece is disposed between the mover and the housing.

7. The vcm according to claim 1, wherein the stator is a magnet, the mover includes a coil and a carrier, the coil is embedded in the carrier, and the carrier is disposed opposite to the base.

8. A camera module, characterized in that, including a lens, a photosensitive chip and the voice coil motor according to any one of claims 1 to 7, the lens is clamped on the inner side wall of the mover of the voice coil motor.

9. A mobile terminal characterized by comprising the camera module according to claim 8.