CN111669026A

CN111669026A - Long-stroke far-focus voice coil motor

Info

Publication number: CN111669026A
Application number: CN202010606160.6A
Authority: CN
Inventors: 高明; 石一崴; 陈佳鑫
Original assignee: Liaoning Zhonglan Photoelectric Technology Co Ltd
Current assignee: Liaoning Zhonglan Photoelectric Technology Co Ltd
Priority date: 2020-06-29
Filing date: 2020-06-29
Publication date: 2020-09-15

Abstract

The invention discloses a large-stroke far-focus voice coil motor, which comprises: the device comprises an iron shell, a magnet, a driving coil, a carrier, a front reed, a rear reed, a base and a lens; the lens is carried in the inner cavity of the carrier; the driving coil is wound on the winding post of the carrier; the inner sides of the front reed and the rear reed are connected with the carrier, and the outer sides of the front reed and the rear reed are connected with the base to provide supporting force for the carrier; the magnet is adhered inside the iron shell and used for providing a magnetic field for the driving coil, and the electrified driving coil drives the carrier and the lens to move back and forth under the action of the magnetic field, so that the focusing function is realized. The design scheme can enable the carrier and the lens to realize large movement displacement in the horizontal direction in a limited space in the vertical direction, so that the lens can obtain a larger multiple of imaging focal length and is used for telescopic shooting of a mobile phone. Meanwhile, the scheme adopts the design of an open-loop voice coil motor, has simple structure and convenient assembly process, and has lower manufacturing cost compared with the current large-multiple far-focus scheme.

Description

Long-stroke far-focus voice coil motor

Technical Field

The invention relates to the technical field of voice coil motors, in particular to a large-stroke far-focus voice coil motor for automatic focusing of a mobile phone camera by large-multiple far focus.

Background

Because Voice Coil Motor (VCM) has simple structure, small, low energy consumption, noiselessness, high acceleration, response speed are fast, the displacement is accurate and advantage such as low price, so to camera automatic focusing device at present, voice coil motor's automatic focusing function still is the scheme that the price/performance ratio is the highest. The optical lens is fixed on the voice coil motor carrier, the carrier serves as a power unit for lens movement, the voice coil motor carrier is connected with the stator through the reed, and after the motor is electrified, the carrier linearly moves along the optical axis direction of the lens, so that the automatic focusing function is realized.

Traditional voice coil motor receives the structural constraint, and the carrier is carrying the camera lens and can only be along vertical direction, upwards or move down, and after the voice coil motor installed, the direction of carrier motion was along cell-phone thickness direction, and this has just had a problem: because the thickness of the mobile phone is limited, the size of the voice coil motor in the vertical direction is required to be as small as possible, and the motion space of the carrier is limited, so that the traditional voice coil motor can only realize 2-to-3-time zooming, and along with the increasing requirements of mobile phone shooting, the 2-to-3-time zooming cannot meet the requirement of mobile phone telephoto shooting, and the carrier can move for a larger stroke when the zoom of a larger multiple is required, but the problem is contradicted with the thickness of the mobile phone, and how to solve the problem that the increase of the stroke of the voice coil motor becomes an urgent need to be solved on the premise that the thickness of the mobile phone is not changed.

Disclosure of Invention

In order to meet the requirement of large-multiple zooming in the telephoto shooting of the mobile phone, the invention breaks through the limit value of the motion mode of the traditional voice coil motor, changes the motion direction of the carrier from the thickness direction of the mobile phone to the direction vertical to the thickness direction of the mobile phone, obtains larger motion space for the carrier, breaks through the traditional stroke limit, increases the stroke of the carrier, and simultaneously adopts the design of an open-loop voice coil motor.

The technical scheme adopted for realizing the purpose of the invention is as follows:

a large stroke, afocal voice coil motor comprising: the device comprises an iron shell, a magnet, a driving coil, a carrier, a front reed, a rear reed, a base and a lens; the lens is carried in the inner cavity of the carrier; the driving coil is wound on the winding post of the carrier; the inner side of the front reed is connected with one end of the carrier, and the inner side of the rear reed is connected with the other end of the carrier; the outer sides of the front spring leaf and the rear spring leaf are connected to the base to provide supporting force for the carrier; the magnet is adhered inside the iron shell and used for providing a magnetic field for the driving coil, and the electrified driving coil drives the carrier and the lens to do large-stroke movement in the horizontal direction under the action of the magnetic field.

The invention has the beneficial effects that:

the invention discloses a large-stroke far-focus voice coil motor, which breaks through the limit value of the motion mode of the traditional voice coil motor, changes the motion direction from the thickness direction of a mobile phone to the direction vertical to the thickness direction of the mobile phone, and solves the problem that the stroke of the voice coil motor is increased under the premise of unchanged thickness of the mobile phone, thereby realizing more times of zooming.

Drawings

Fig. 1 is an exploded view of a large-stroke afocal voice coil motor of the present invention.

Fig. 2 is a schematic diagram of the upper half of a large-stroke afocal voice coil motor according to the present invention.

Fig. 3 is a schematic diagram of the lower half part of a large-stroke afocal voice coil motor according to the present invention.

Fig. 4 is a schematic diagram of the lower half of a large-stroke afocal voice coil motor rotating 180 degrees according to the present invention.

Detailed Description

The invention is described in further detail below with reference to the figures 1-4.

As shown in fig. 1: a new damping structure for a voice coil motor, comprising: the lens driving device comprises an iron shell 1, a magnet 2, a driving coil 3, a carrier 4, a front reed 5, a rear reed 6, a base 7 and a lens 8.

As shown in fig. 2: a large stroke, afocal voice coil motor top half, comprising: an iron shell 1 and a magnet 2; the iron shell (1) is made of a magnetic conductive material, the inner side of the upper surface of the iron shell is provided with four inner punching structures (9), the inner punching structures (9) are used for clamping the magnets (2), and the magnets (2) are bonded on the inner side of the iron shell (1) through glue to provide a stable magnetic field for the driving coil (3); on the optical axis of the lens 8, die-cut openings are left on two sides of the iron shell 1 to be used as light path through openings.

As shown in fig. 3 and 4: a large stroke afocal voice coil motor bottom half comprising: the driving coil 3, the carrier 4, the front reed 5, the rear reed 6, the base 7 and the lens 8. The driving coil 3 is wound on one winding post 10 of the carrier 4 to serve as a starting wire, is wound on the coil limiting boss 11 through the wire slot, and returns to the other winding post 11 to serve as a finishing wire; the rear reed 6 is assembled on a rear positioning column 13 of the base 7, and after riveting, the other side of the rear reed 5 is assembled on a rear riveting column 13 of the carrier 4 and is riveted and fixed; assembling the front reed 5 on the carrier 4 and a front positioning column 12 of the base 7, and welding a bonding pad 14 of the front reed and a coil on the winding column 10 together after riveting and fixing; welding the front reed 5 and the metal terminal 15 together, wherein at the moment, current forms a complete loop through the metal terminal 15 in the base 7, the winding post 10 on the carrier 4 of the front reed 5, the driving coil 3, the front reed 5 on the other side and the metal terminal 15 on the other side; damping glue is dispensed at the positions of the four damping teaching grooves 16 and is used for rapidly stabilizing the lens 8 carried by the carrier 4 when the voice coil motor is focused at a far focus.

And finally, assembling the upper part and the lower part together to form the large-stroke far-focus voice coil motor, wherein the electrified driving coil 3 can move in the horizontal direction under the action of the magnetic field of the magnet 2, so that the aim of far focusing of the camera of the mobile phone is fulfilled.

The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.

Claims

1. The utility model provides a long-range long focus voice coil motor which characterized in that:

the method comprises the following steps: the device comprises an iron shell (1), a magnet (2), a driving coil (3), a carrier (4), a front reed (5), a rear reed (6), a base (7) and a lens (8);

the lens (8) is carried in the inner cavity of the carrier (4); the driving coil (3) is wound on the winding column of the carrier (4);

the inner side of the front reed (5) is connected with one end of the carrier (4), and the inner side of the rear reed (6) is connected with the other end of the carrier (4); the outer sides of the front reed (5) and the rear reed (6) are connected to the base (7) to provide supporting force for the carrier (4);

the magnet (2) is adhered inside the iron shell (1) and used for providing a magnetic field for the driving coil (3), and the electrified driving coil (3) drives the carrier (4) and the lens (8) to move in a large stroke in the horizontal direction under the action of the magnetic field.

2. A large stroke afocal voice coil motor as defined by claim 1, wherein:

the iron shell (1) is made of a magnetic conductive material, the inner side of the upper surface of the iron shell is provided with four side punching concave structures, and the inner concave holes are used for clamping the magnets (2); on the optical axis of the lens (8), punching notches are reserved on two sides of the iron shell (1) and used as light path through ports.

3. A large stroke afocal voice coil motor as defined by claim 1, wherein:

a through hole for fixing the lens (8) is reserved in the middle of the carrier (4); 4 riveting columns for riveting and fixing the front reed (5) and the rear reed (6) are respectively reserved on two sides of the carrier (4) along the horizontal direction of the optical axis; two wrapping posts for welding are reserved on the upper surface, close to the front reed (5), of the carrier (4), and the wrapping posts are welded with the front reed (5); the driving winding (3) is annularly wound on the limiting groove on the upper surface of the carrier (4) and is distributed corresponding to the magnet (2); two side surfaces of the carrier (4) are respectively provided with 2 grooves with damping glue points; and a limiting boss for limiting is reserved on the side wall of the carrier (4).

4. A large stroke afocal voice coil motor as defined by claim 1, wherein:

base (7) have adopted the injection moulding structure, and inside the inlaying has the metal terminal, and the metal terminal extends from base (7) one side and is used for the power supply for voice coil motor, and the electric current constitutes a complete return circuit through metal terminal in base (7), winding post, drive coil (3), the leading reed of opposite side (5), the opposite side metal terminal on leading reed (5) of one side, carrier (4).

5. A large stroke afocal voice coil motor as defined by claim 1, wherein:

riveting columns for fixing the front reed (5) and the rear reed (6) are arranged on two sides of the base (7); a groove with a little damping glue is reserved in the base (7) corresponding to the glue groove of the carrier (4); a limit boss for limiting is arranged in the base (7).