CN214281194U

CN214281194U - Voice coil motor

Info

Publication number: CN214281194U
Application number: CN202120529163.4U
Authority: CN
Inventors: 韦韩
Original assignee: Beijing Meitase Electronic Co ltd
Current assignee: Beijing Meitase Electronic Co ltd
Priority date: 2021-03-11
Filing date: 2021-03-11
Publication date: 2021-09-24
Anticipated expiration: 2031-03-11

Abstract

The utility model relates to a voice coil motor, which comprises an antimagnetic cover, a magnet strip, a lens mount and a coil; more than one pair of magnet strips; one magnet strip in the pair of magnet strips is fixed on the inner side surface of one side wall of the antimagnetic cover, the other magnet strip is fixed on the inner side surface of the opposite side wall, the two magnet strips are arranged oppositely, and the polarities of the opposite surfaces are opposite; the lens mount is arranged between the pair of magnet strips, and one end of the lens mount is of an open structure and faces the abdicating hole; the coil is wound on the lens seat, one side of the coil is arranged opposite to one magnet strip, and the opposite side of the coil is arranged opposite to the other magnet strip. The coil is stressed in a magnetic field generated by the magnet strip, so that the coil has thrust on the lens seat. The stress direction of the coil is changed by changing the direction of current in the coil, so that the coil moves up and down along the axis of the antimagnetic shield, and the lens mount is driven to move up and down. The magnet strips are of a strip-shaped structure, and compared with the arc-shaped magnet adopted by the traditional voice coil motor, the manufacturing difficulty is greatly reduced, and the manufacturing cost is effectively saved.

Description

Voice coil motor

Technical Field

The utility model relates to a camera spare part technical field especially relates to a voice coil motor.

Background

With the popularization of 5G networks, the functions of the camera module are also continuously upgraded, and the video camera is upgraded from a fixed-focus mode to a zoom mode. Therefore, a voice coil motor needs to be added to the camera module. The voice coil motor is a device capable of converting electric energy into mechanical energy, has a large thrust, and can drive a lens to make linear motion.

However, the manufacturing cost of the conventional voice coil motor is high, which results in high manufacturing cost of the camera module.

SUMMERY OF THE UTILITY MODEL

For the manufacturing cost who solves traditional voice coil motor is higher, cause the higher problem of the manufacturing cost of the module of making a video recording, the utility model provides a voice coil motor.

The voice coil motor provided for realizing the purpose of the utility model comprises a antimagnetic cover, a magnet strip, a lens mount and a coil;

the antimagnetic cover is of a square hollow structure, the top end of the antimagnetic cover is provided with a abdicating hole, and the lower end of the antimagnetic cover is of an opening structure;

more than one pair of magnet strips; one magnet strip in the pair of magnet strips is fixed on the inner side surface of one side wall of the antimagnetic cover, the other magnet strip is fixed on the inner side surface of the opposite side wall, the two magnet strips are arranged oppositely, and the polarities of the opposite surfaces are opposite;

the lens mount is arranged between the pair of magnet strips, and one end of the lens mount is of an open structure and faces the abdicating hole;

the coil is wound on the lens seat, one side of the coil is arranged opposite to one magnet strip, and the opposite side of the coil is arranged opposite to the other magnet strip.

In one embodiment, the coil has a square configuration in a top-down orthographic projection.

In one embodiment, the length of the magnetic field on both sides of the coil is greater than the length of the magnet bars on the respective sides.

In one specific embodiment, the magnetic yoke plate is further included;

more than one pair of magnetic yoke plates; the pair of magnetic yoke plates are positioned between the pair of magnetic stone strips, and the two magnetic yoke plates are respectively arranged opposite to the magnetic stone strips on the corresponding sides and are respectively fixed on the side walls of the antimagnetic shields on the corresponding sides.

In one embodiment, the magnet strips and the yoke plates are each two pairs;

the two pairs of magnet strips are respectively fixed on the inner side surfaces of the four side walls of the antimagnetic cover; the two magnet strips in each pair are arranged oppositely, and the polarities of the opposite surfaces are opposite;

one pair of magnetic yoke plates is positioned between one pair of magnetic stone strips; the other pair of magnetic yoke plates is positioned between the other pair of magnetic stone strips; the four yoke plates are respectively fixed on the four side walls of the antimagnetic cover.

In one embodiment, the antimagnetic cover and the yoke plate are integrally formed.

In one specific embodiment, the elastic piece comprises an upper elastic piece and a lower elastic piece;

the upper elastic sheet is fixed on the top end surface outside the antimagnetic cover, and the middle part of the upper elastic sheet is provided with a abdicating hole;

the lower elastic sheet is arranged in the antimagnetic cover, the middle part of the lower elastic sheet is provided with a yielding hole, and the top end of the lower elastic sheet is fixedly connected with the bottom end surface of the lens seat.

In one specific embodiment, the device further comprises a top cover;

the top cover is fixed on the top end surface of the upper elastic sheet;

the middle part of the top cover is provided with a yielding hole.

In one specific embodiment, the device further comprises an upper base and a lower base;

the upper base is of a square structure, an upper through hole is formed in the middle of the upper base, and positioning parts extending downwards are arranged at four corners of the upper base;

the lower base is also of a square structure, a lower through hole is formed in the middle of the lower base, and positioning notches matched with the positioning parts are formed in the four corners of the lower base;

the bottom end of the upper base is fixedly connected with the top end of the lower base, and the top end of the upper base is fixedly connected with the bottom end of the antimagnetic shield;

the lower elastic sheet is also provided with a limiting hole, and correspondingly, the top end of the upper base is provided with a limiting part; the limiting part is matched with the limiting hole and can be inserted into the limiting hole so that the top end face of the upper base is abutted to the bottom end face of the lower elastic sheet.

The utility model has the advantages that: the utility model discloses a voice coil motor is through setting up coil and magnet strip, and the coil atress in the magnetic field that the magnet strip produced to make the coil have thrust to the lens holder. Wherein, coil and antimagnetic cover coaxial line change the atress direction of coil through the direction that changes the electric current in the coil to make the coil move along antimagnetic cover's axis, make the lens mount move towards or the hole of stepping down dorsad, and then drive the lens mount and move towards or the hole of stepping down dorsad, thereby drive the camera lens and move. The antimagnetic cover has a shielding effect, can reduce the possibility that magnetic induction radiation is radiated to the outside, and avoids the interference of a magnetic field to the outside. The number of turns of the coil is changed to change the stress of the coil on a magnetic field, so that the thrust of the coil to the lens seat can be adjusted. To meet the actual need. The magnet strips are of a strip-shaped structure, and compared with the arc-shaped magnet adopted by the traditional voice coil motor, the manufacturing difficulty is greatly reduced, and the manufacturing cost is effectively saved.

Drawings

Fig. 1 is a schematic view of a disassembled structure of an embodiment of a voice coil motor according to the present invention;

fig. 2 is a schematic view of a combination structure of another embodiment of the voice coil motor of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the terms "top", "bottom", "inner", "outer", "axis", "circumferential" and the like refer to the orientation or positional relationship shown in the drawings, which are only for convenience of description of the present invention or simplification of the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," "engaged," "hinged," and the like are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other suitable relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to fig. 1, as an embodiment of the present invention, the voice coil motor includes a magnet shield 110, a magnet strip 120, a lens mount 130, and a coil 140. Wherein, the antimagnetic cover 110 is a square hollow structure, the top end is provided with a yielding hole, and the lower end is an opening structure. The number of the magnet strips 120 is more than one pair, wherein one magnet strip 120 of the pair of magnet strips 120 is fixed on the inner side surface of one side wall of the antimagnetic housing 110, the other magnet strip is fixed on the inner side surface of the opposite side wall, the two magnet strips 120 are arranged oppositely, and the polarities of the opposite sides are opposite. The lens mount 130 is disposed between the pair of magnet strips 120, and has an open end facing the abdicating hole. The coil 140 is wound around the lens holder 130, and one side of the coil is disposed opposite to one magnet strip 120, and the opposite side of the coil is disposed opposite to the other magnet strip 120.

In this embodiment, the lens holder 130 is a hollow structure, the inner wall of which is threaded, and one end of which is open. Lens for cameraThe open end of the head mount 130 is fixed in the lens. The outer wall of the bottom end of the lens is also provided with threads, and the outer wall of the bottom end of the lens and the inner wall of the lens holder 130 are screwed by the threads to fixedly mount the lens on the lens holder 130. A coil 140 is wound around the outer wall of the lens holder 130. A magnet strip 120 is fixed to the inner side of each of the two opposite sidewalls of the antimagnetic cover 110, that is, a magnet strip 120 is disposed on each of the two sides of the coil 140. Wherein, the magnet strips 120 on the two opposite side walls are arranged oppositely, and the polarities of the opposite surfaces are opposite. In this manner, the coil 140 is placed in a permanent magnetic field. The coil 140 is connected to an external power source, so that current flows through the coil 140. As can be seen from the lorentz force law, the energized coil 140 is forced in a magnetic field. The force is F_{Lorentz force}Where B is the magnetic field strength, I is the current magnitude, and L is the effective length of the coil 140 in the magnetic field. The direction of the force is determined by the left-hand rule. It should be noted that the coil 140 and the antimagnetic housing 110 are coaxial, and the direction of the current in the coil 140 is changed to change the force direction of the coil 140, so that the coil 140 moves along the axis of the antimagnetic housing 110, that is, the lens holder 130 moves towards or away from the yielding hole, and further drives the lens holder 130 to move towards or away from the yielding hole, thereby driving the lens to move. The antimagnetic cover 110 is made of iron, has a shielding effect, and can reduce the possibility of radiating magnetic induction rays to the outside and prevent the magnetic field from interfering with the outside. The force applied to the magnetic field by the coil 140 is changed by changing the number of turns of the coil 140, so that the thrust of the coil 140 to the lens holder 130 is adjustable. To meet the actual need. Wherein, magnet strip 120 is rectangular structure, and circular-arc magnet that traditional voice coil motor adopted has greatly reduced the manufacturing degree of difficulty relatively, has saved manufacturing cost effectively.

The utility model discloses an in the embodiment, coil 140 from the top orthographic projection of down is square structure, adopts the coil 140 of circular structure relatively, makes the effective length L value that coil 140 both sides are in magnetic field great, and then makes coil 140 both sides atress bigger, so that coil 140 produces great drive power to lens mount 130, and then makes lens mount 130 can drive heavier camera lens and remove, thereby makes the stroke of camera lens great, and the stability of motion is higher. Moreover, the length of the magnetic field on the two sides of the coil 140 is greater than the length of the magnet strip 120 on the corresponding side, so that the utilization of the magnetic field by the coil 140 is effectively improved, the consumption of magnets is reduced, the manufacturing raw materials are saved, and the thrust of the coil 140 is ensured.

In an embodiment of the present invention, the voice coil motor further includes a yoke plate 190. The number of the yoke plates 190 is more than one pair, the pair of yoke plates 190 is located between the pair of magnet bars 120, and the two yoke plates 190 are respectively disposed opposite to the magnet bars 120 on the corresponding side and respectively fixed on the side walls of the antimagnetic shields 110 on the corresponding sides. The yoke plate 190 can enhance the magnetic field strength B, so that the coil 140 is stressed more in the magnetic field, so that the coil 140 generates a larger thrust to the lens mount 130, and the lens mount 130 can drive a heavier lens to move, thereby enabling the lens to have a larger stroke and higher movement stability.

In one embodiment of the present invention, the magnet strips 120 and the yoke plate 190 are two pairs. Two pairs of magnet strips 120 are fixed to the inner side surfaces of the four side walls of the antimagnetic housing 110. The two magnet bars 120 in each pair are disposed opposite to each other, and the polarities of the opposite sides are opposite. One pair of yoke plates 190 is located between one pair of magnet bars 120 and the other pair of yoke plates 190 is located between the other pair of magnet bars 120. Four yoke plates 190 are fixed to four sidewalls of the antimagnetic housing 110, respectively. Thus, the driving force of the coil 140 is further enhanced, and the lens holder 130 can drive the heavier lens to move, so that the lens has a larger stroke and a higher motion stability.

In an embodiment of the present invention, the anti-magnetic cover 110 and the magnetic yoke plate 190 are integrally formed, thereby saving the processing steps and improving the production efficiency. The vcm further comprises an upper spring 150, a lower spring 160, a top cover 170, an upper base 181 and a lower base 182. Wherein, the upper spring plate 150 is fixed on the top end surface outside the antimagnetic cover 110, and the middle part is provided with a yielding hole. The upper spring 150 can restrain the top end of the lens holder 130 to prevent the lens from being separated from the top end of the magnet shield 110. The lower resilient sheet 160 is disposed in the antimagnetic housing 110, and has a middle portion with a hole for stepping down, and a top end fixedly connected to the bottom end surface of the lens mount 130. The lower elastic sheet 160 can restrict the bottom end of the lens holder 130 to prevent the lens from being separated from the bottom end of the magnetic shield 110. Wherein, the top cover 170 is fixed on the top end surface of the upper spring plate 150, and the middle part of the top cover 170 is provided with a yielding hole. The top cover 170 serves as a protective cover, which can effectively protect the magnetic shield 110 and the upper spring 150. The offset hole facilitates the bottom end of the lens to be inserted into the lens holder 130. Wherein, the upper base 181 is a square structure, the middle part is provided with an upper through hole, and four corners are provided with positioning parts 1811 extending downwards. The lower base 182 is also a square structure, a lower through hole is provided in the middle, and positioning notches matched with the positioning portions 1811 are provided at four corners. The bottom end of the upper base 181 is fixedly connected with the top end of the lower base 182, and the positioning portion 1811 is matched with the positioning notch to effectively improve the positioning accuracy when the upper base 181 and the lower base 182 are installed. The top end of the upper base 181 is fixedly connected with the bottom end of the antimagnetic cover 110. The lower spring plate 160 is further provided with a limiting hole, and correspondingly, the top end of the upper base 181 is provided with a limiting part. The limiting part is matched with the limiting hole and can be inserted into the limiting hole so that the top end surface of the upper base 181 is abutted to the bottom end surface of the lower elastic sheet 160. The limiting part is matched with the limiting hole, so that the positioning accuracy of the upper base 181 and the lower elastic sheet 160 in installation is effectively improved.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," "one specific embodiment," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, a schematic representation of the term does not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can equally replace or change the technical solution and the inventive concept of the present invention within the scope of the present invention.

Claims

1. A voice coil motor, comprising:

the magnetic shield, the magnet strip, the lens mount and the coil;

the magnetic stone strips are more than one pair; one magnet strip in the pair of magnet strips is fixed on the inner side surface of one side wall of the antimagnetic cover, the other magnet strip is fixed on the inner side surface of the opposite side wall, the two magnet strips are arranged oppositely, and the polarities of the opposite surfaces are opposite;

the coil is wound on the lens mount, one side of the coil is opposite to one magnet strip, and the opposite side of the coil is opposite to the other magnet strip.

2. The voice coil motor of claim 1, wherein an orthographic projection of the coil from top to bottom is a square configuration.

3. A voice coil motor as claimed in claim 1, wherein the length of the magnetic field on both sides of the coil is greater than the length of the magnet bars on the respective sides.

4. The voice coil motor according to any one of claims 1 to 3, further comprising a yoke plate;

the number of the magnetic yoke plates is more than one pair; the pair of yoke plates are positioned between the pair of magnet strips, and the two yoke plates are respectively arranged opposite to the magnet strips on the corresponding side and are respectively fixed on the side walls of the antimagnetic shields on the corresponding sides.

5. The voice coil motor of claim 4, wherein the magnet strips and the yoke plate are each two pairs;

wherein a pair of said yoke plates are located between a pair of said magnet strips; another pair of said yoke plates is located between another pair of said magnet strips; the four yoke plates are respectively fixed on the four side walls of the antimagnetic cover.

6. The voice coil motor of claim 5, wherein the antimagnetic cap and the yoke plate are integrally formed.

7. The voice coil motor of any one of claims 1 to 3, further comprising an upper spring plate and a lower spring plate;

the upper elastic sheet is fixed on the top end surface outside the antimagnetic cover, and the middle part of the upper elastic sheet is provided with the abdicating hole;

the lower elastic sheet is arranged in the antimagnetic cover, the middle part of the lower elastic sheet is provided with the abdicating hole, and the top end of the lower elastic sheet is fixedly connected with the bottom end surface of the lens seat.

8. The voice coil motor of claim 7, further comprising a top cover;

the top cover is fixed on the top end surface of the upper elastic sheet;

the middle part of the top cover is provided with the abdicating hole.

9. The voice coil motor of claim 7, further comprising an upper base and a lower base;