CN108810389B

CN108810389B - Double-camera motor

Info

Publication number: CN108810389B
Application number: CN201811035967.8A
Authority: CN
Inventors: 许乃文; 游证凯; 宋秉儒
Original assignee: Huizhou Sazhide Optoelectronics Technology Co ltd
Current assignee: Huizhou Sazhide Optoelectronics Technology Co ltd
Priority date: 2018-09-06
Filing date: 2018-09-06
Publication date: 2023-08-01
Anticipated expiration: 2038-09-06
Also published as: CN108810389A

Abstract

The invention relates to a double-camera motor which comprises two lens supports, a first driving coil group and a first magnet for driving the first lens support to move, and a second driving coil group and a second magnet for driving the second lens support to focus. In the initial state, the positions of the outer edges of the two first magnets in the Y-axis direction are located further outside than the positions of the outer edges of the second magnets in the Y-axis direction as viewed in the X-axis direction. The invention optimizes the magnet arrangement structure of the two magnet groups of the double-camera motor, reduces the magnetic force staggering degree between the two magnet groups, reduces the magnetic force interference and ensures the driving quality of the double-camera motor.

Description

Double-camera motor

Technical Field

The invention relates to the technical field of optical lens driving, in particular to a double-camera motor.

Background

Along with the recent technological development, various mobile devices such as notebook computers, tablet computers, mobile phones and the like are rapidly updated, and the integrated functions are more and more, and in terms of photographing functions, a dual-camera motor is rising in order to achieve higher-quality imaging. The double-camera motor can adopt two cameras to shoot simultaneously, can compensate each other to acquire high-quality photos, and can also synthesize images shot by the two cameras into a video with a 3D effect.

The conventional lens driving motor of the portable device generally adopts a voice coil motor. The voice coil motor drives the lens to move by utilizing the permanent magnetic field of the magnet and the Lorentz force generated by the electrified coil, so as to realize focusing. For the dual camera motor, two voice coil motors are required to drive two lens groups respectively, and two groups of magnets of the two voice coil motors are easy to generate mutual magnetic interference, so that the image shooting quality is improved.

For example, a VCM (Voice Coil Motor) is used with an OIS (Optical Image Stabilization, optical anti-shake, dual-function focusing and anti-shake) dual-camera Motor, in order to reduce the interference degree between magnets, a unipolar magnet is used on the VCM module to reduce the magnetic field dissipated from the interior of the VCM to the OIS module, so as to reduce the magnetic interference, which causes the VCM module to increase the magnetic conductive sheet, to squeeze the interior space of the VCM, and to increase the cost. In the double-camera motor of the type, the single-sided bipolar magnet can be adopted on the VCM module to reduce magnetic interference, but the manufacturing process of the single-sided bipolar magnet is complex, the quality stability of a finished product is low, the driving effect is poor, and the cost is high.

Disclosure of Invention

In order to solve the problems, the invention provides a double-camera motor with low magnetic interference degree between two camera motors.

A dual camera motor, comprising: the lens comprises a first lens support and a second lens support, wherein the optical axis direction of a lens borne by one lens support is defined as a Z-axis direction, and two directions perpendicular to the Z-axis direction and mutually perpendicular to each other are defined as an X-axis direction and a Y-axis direction; a first driving coil group for driving the first lens holder to move and two plate-shaped first magnets substantially parallel to a plane defined by the X-axis direction and the Z-axis direction; and a second driving coil group for driving the second lens support to move and four second magnets arranged around the periphery of the second lens support. In the initial state, the positions of the outer edges of the two first magnets in the Y-axis direction are located further outside than the positions of the outer edges of the second magnets in the Y-axis direction as viewed from the X-axis direction.

Preferably, the distance between the positions of the outer edges of the two first magnets in the Y-axis direction and the positions of the outer edges of the second magnets in the Y-axis direction is less than or equal to the thickness of the first magnets when viewed from the X-axis direction.

As one embodiment, the magnetizing direction of the first magnet is parallel to the Y-axis direction and perpendicular to the Z-axis direction, and the magnetizing direction of the second magnet has an included angle of 45 ° with the X-axis or Y-axis direction and perpendicular to the Z-axis direction.

In one embodiment, the first magnet and the second magnet are single-sided unipolar magnets.

Preferably, no corresponding magnetic conductive sheet is arranged between the two first magnets.

In one embodiment, the second magnet is a plate-shaped magnet substantially parallel to the Z-axis direction, and is arranged in a circular array around the central axis of the second lens holder.

In one embodiment, the two first magnets have the same magnetic poles facing the first lens holder and the four second magnets have the same magnetic poles facing the second lens holder.

As one embodiment, the dual camera motor further comprises two plate-shaped third magnets for driving the first lens frame to move, wherein the two plate-shaped third magnets are generally parallel to a plane defined by the Y-axis direction and the Z-axis direction; the four second magnets are divided into two groups positioned at two sides of the Y-axis direction, and a magnetic conduction element for reducing magnetic interference between the second magnets and the third magnets is arranged between the two second magnets of each group.

As one embodiment, the two first magnets and the two third magnets have the same magnetic poles facing the first lens support and the four second magnets have the same magnetic poles facing the second lens support; when the magnetic conduction element is a single-sided monopole magnet, the magnetizing directions of the third magnet and the magnetic conduction element which are close to each other are the same.

As one embodiment, the dual camera motor further comprises two plate-shaped third magnets for driving the first lens support to move and being generally parallel to a plane defined by the Y-axis direction and the Z-axis direction, and a magnetic conduction element arranged between the two second magnets close to the first magnets for reducing magnetic interference between the second magnets and the third magnets; the two first magnets and the two third magnets have the same magnetic poles facing one side of the first lens support and the same magnetic poles facing one side of the second lens support as the four second magnets; when the magnetic conduction element is a single-sided monopole magnet, the magnetization direction of the magnetic conduction element is the same as that of a third magnet close to the magnetic conduction element.

The invention creatively optimizes the magnet arrangement structure of the two magnet groups of the double-camera motor, thereby greatly reducing the magnetic force staggering degree between the two camera motors even if single-sided unipolar magnets are used completely, reducing magnetic force interference and ensuring the imaging quality of the double-camera motor. Therefore, the unipolar magnet can meet the magnetic interference requirement, and a magnetic conduction sheet is not needed, so that the production cost is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a dual camera motor according to a first embodiment of the present invention.

Fig. 2 is a schematic diagram illustrating a relative positional relationship between a first magnet set and a second magnet set according to the present embodiment.

Fig. 3 is a magnetic density distribution diagram of two magnet sets in the prior art when the two sides of the projection of the two magnet sets in the Y-axis direction are leveled.

Fig. 4 is a magnetic density distribution diagram of the first magnet set of the present invention when two sides of the projection of the first magnet set in the Y-axis direction exceed the projection of the second magnet set.

Fig. 5 is a schematic structural diagram of a dual camera motor in a second embodiment of the present invention.

Fig. 6 is a schematic diagram showing the magnetic field relationship between two sets of magnets in the second embodiment.

Fig. 7 is a schematic diagram showing the relationship between attractive force and repulsive force between two sets of magnets in the second embodiment.

Detailed Description

In order to facilitate an understanding of the present invention by those skilled in the art, the present invention will be described in further detail with reference to specific examples and drawings.

Embodiment one:

in this embodiment, referring to fig. 1, a dual camera motor is in the form of a combination of a VCM motor (having only a focusing function) 10 and an OIS motor (having both a focusing function and an anti-shake function) 20. Wherein the VCM motor 10 includes a first lens holder 11 and a first driving unit for driving the first lens holder 11 to move. The first drive unit includes a first drive coil group (not shown) and two first magnets 12 that are opposed to each other with a space therebetween in a direction perpendicular to the optical axis. The support member includes, in addition to the first lens holder 11, a peripheral support member (not shown) provided on the outer peripheral side of the first lens holder 11, and an elastic member (not shown) that suspension-supports the first lens holder 11 inside the peripheral support member to allow the first lens holder to move in the optical axis direction. Wherein the driving coil is fixed on the outer side wall of the first lens support, and the first magnet is fixed on the peripheral support member. In operation, the driving coil in the magnetic field of the magnet is electrified, and the generated lorentz force is utilized to push the first lens support to realize the focusing driving function of the lens. In addition, the closed-loop control function can be realized by arranging a sensor for position sensing and a magnet. Considering that the VCM motor overall construction is already prior art, only part of the components are shown in fig. 1 and 2.

For convenience of description, the optical axis direction of the lens carried by the first lens holder 11 is defined as a Z-axis direction, and two directions perpendicular to the Z-axis direction and perpendicular to each other are defined as an X-axis direction and a Y-axis direction. It is also defined that the subject is located in front of the optical axis direction. In fig. 1 and 2, the direction of the vertical screen is the Z-axis direction. In this embodiment, the first magnet 12 is two square plate-shaped single-sided monopole magnets (the magnets are dipole magnets, the magnetic poles are respectively located on two surfaces of the plate), and are respectively disposed on two sides of the X-axis direction, the magnetic pole surfaces (i.e. substantially or approximately) are substantially parallel to the plane defined by the X-axis direction and the Z-axis direction, and the magnetic poles facing the magnetic pole surfaces of the first lens holder 11 are the same, and are both N-poles or S-poles. And, the magnetizing direction of the first magnet 12 is perpendicular to the magnetic pole face (also perpendicular to the plane defined by the X-axis direction and the Z-axis direction, see arrow S in fig. 2).

The OIS motor 20 includes a second lens holder 21 and second and third driving units for driving the second lens holder 21 to move. The optical axis direction of the lens carried by the second lens holder 21 is parallel to the Z-axis direction. The second driving unit is for driving the second lens holder 21 to move in the direction of the lens optical axis to achieve a focusing function, and includes a second driving coil group (not shown) and four second magnets 22 that are spaced apart from each other in a direction perpendicular to the optical axis. The third driving unit is for driving the second lens holder 21 to move in a direction perpendicular to the optical axis of the lens to realize a shake compensation function, and includes a plurality of shake-preventing driving coils (each wound around a direction parallel to the optical axis) fixed at the rear in the optical axis direction and the above-described four second magnets 22. The anti-shake driving coil and the second magnet 22 are spaced apart from each other in the optical axis direction. The support means includes, in addition to the second lens holder 21, a magnet holder (not shown) for fixing the second magnet 22 provided on the outer peripheral side of the first lens holder 11, an elastic member (e.g., a plate spring, not shown) for suspension-supporting the second lens holder 21 inside the magnet holder to allow the first lens holder to move in the optical axis direction with respect to the magnet holder, and an elastic member (e.g., a linear spring extending in a direction parallel to the optical axis direction, not shown) for suspension-supporting the magnet holder to allow the magnet holder to move in a direction perpendicular to the optical axis. Wherein the second driving coil is fixed on the outer side wall of the second lens support. In operation, the second driving coil in the magnetic field of the magnet is electrified, and the generated Lorentz force is utilized to push the second lens support to move in the direction of the optical axis so as to realize the focusing driving function of the lens. Through energizing anti-shake driving coil, utilize the lorentz force that produces to promote the magnet support and take the second lens support to remove in the direction perpendicular to optical axis and realize shake compensation function. Considering that OIS motor overall construction is already prior art, only some of the components are shown in the figures.

In the present embodiment, the second magnet 22 is four single-sided monopole magnets having a substantially square plate shape, and the magnetic pole faces are arranged in a circular array (rotationally symmetrical distribution) around the outer peripheral side of the second lens holder 21 in a state parallel to the optical axis direction. Each magnet of the second magnet group is also in a substantially square plate shape, and both side ends are triangular, as viewed from the direction of the optical axis of the lens. The directions after the X-axis direction and the Y-axis direction are rotated counterclockwise by 45 degrees (clockwise rotation is also possible) around the Z-axis direction are defined as the X '-axis direction and the Y' -axis direction. The magnetic pole faces of the second magnet 22 are perpendicular to the X 'axis direction and the Y' axis direction, respectively, and parallel to the Z axis direction. The magnetic poles of the second magnet 22 facing the magnetic pole face of the second lens holder 21 are the same as the magnetic poles of the first magnet 12 facing the magnetic pole face of the first lens holder 11. The magnetizing direction of the second magnet 22 is perpendicular to the magnetic pole surface (45 degrees from the plane defined by the X-axis direction and the Z-axis direction).

In particular, in the initial state, the positions of the outer edges of the two first magnets 12 in the Y-axis direction (the end positions of the projections of the magnets on the Y-axis) are located further outside than the positions of the outer edges of the second magnets 22 in the Y-axis direction, as viewed from the X-axis direction (and standing direction is parallel to the lens optical axis direction). In more detail, when the Z axis is located at the axial center of the first lens holder 11, the furthest end of the projection of the first magnet 12 on the +y axis side is larger than the furthest end of the projection of the second magnet 22 on the +y axis side. And the furthest end of the projection of the first magnet 12 on the-Y axis side is greater than the furthest end of the projection of the second magnet 22 on the-Y axis side. Please refer to the most distal portion identified by the dashed line in fig. 2.

The arrangement structure of the two magnet groups can greatly reduce the magnetic force staggering degree between the two magnet groups even if all single-sided unipolar magnets are used under the condition that no magnetic conductive sheet is used, so that the mutual interference is greatly reduced, and the performance of the two camera motors is more stable. Taking a motor size VCM motor of 9.5mm (length) x8mm (width) and OIS motor of 9.5mm (length) x9.5mm (width) as an example, as shown in fig. 3, a conventional dual camera motor is shown, wherein the VCM motor adopts a single-sided monopole magnet, no magnetic conductive sheet is used, and the end parts of the magnets are flush, so that a strong magnetic interference is generated between a first magnet of the VCM motor and a second magnet of an adjacent OIS motor (see two places b and c in fig. 3). As shown in fig. 4, for the double camera motor of the present invention, with the same size, when the outer edge positions of the two first magnets in the Y-axis direction are seen from the X-axis direction, the magnetic field is larger than the outer edge position of the second magnet in the Y-axis direction by a distance half the thickness of the first magnet, and the visible magnetic interference is significantly reduced (see two parts b 'and c' in fig. 4).

In other embodiments, the distance between the projected ends of the first magnet and the second magnet in the Y-axis direction may be adjusted according to the actual situation. Preferably, the distance between the positions of the outer edges of the two first magnets in the Y-axis direction and the positions of the outer edges of the second magnets in the Y-axis direction is less than or equal to the thickness of the first magnets when viewed from the X-axis direction. This configuration allows the first magnet to use a single sided unipolar magnet without the VCM motor having a magnetic conductive sheet.

Two motors may be housed in a rectangular parallelepiped housing 100.

Embodiment two:

referring to fig. 5 and 6, the difference between the present embodiment and the first embodiment is that two OIS motors are used. The OIS motor 20 (first OIS motor) on the right side of the figure is the same as that of the first embodiment, and the OIS motor 30 (second OIS motor) on the left side is similar to that on the right side, except that the placement position of the third magnet 32 of the second OIS motor 30 (it can be understood that the positions of relevant components such as the anti-shake driving coil are also correspondingly adjusted, which will not be described herein). Specifically, two square-plate-shaped single-sided monopole third magnets 32 are disposed on both sides in the X-axis direction, and the magnetic pole faces are substantially (i.e., substantially or approximately) parallel to the planes defined by the X-axis direction and the Z-axis direction. Two other square plate-like single-sided monopole third magnets 32' are disposed on either side of the Y-axis direction, with the pole faces being generally (i.e., substantially or approximately) parallel to the plane defined by the Y-axis direction and the Z-axis direction. The magnetic poles of the third magnets 32, 32' facing the magnetic pole face of the third lens holder 31 are identical to the magnetic poles of the second magnet 22 facing the magnetic pole face of the second lens holder 21. The magnetizing direction of the third magnets 32, 32' is perpendicular to the respective magnetic pole faces.

Further, similarly to the first magnet 12 in the first embodiment, the magnet outer edge positions (end positions of projections of the magnets on the Y axis) of the two third magnets 32 of the second OIS motor 30 located in the Y axis direction are located further outside than the magnet outer edge positions of the second magnet 22 of the first OIS motor 20 in the Y axis direction, as viewed from the X axis direction (and standing direction is parallel to the lens optical axis direction). In more detail, when the Z axis is located at the axial center of the third lens holder 31, the furthest end of the projection of the third magnet 32 on the +y axis side is larger than the furthest end of the projection of the second magnet 22 on the +y axis side. And the furthest end of the projection of the third magnet 32 on the-Y axis side is larger than the furthest end of the projection of the second magnet 22 on the-Y axis side. In this way, the magnetic interference between the third magnet 32 and the second magnet 22 can be reduced.

In order to reduce the magnetic interference of the two third magnets 32' located in the X-axis direction to the second magnet 22, two magnetic conductive elements 25 are further disposed in the first OIS motor 20. The magnetic conductive element 25 may be a metal magnetic conductive sheet, a permanent magnet or an electromagnet. In this embodiment, a single-sided monopole magnet is used. The four second magnets 22 are divided into two groups located on both sides in the Y-axis direction (i.e., located in the X-axis direction), and a magnetic conductive member 25 for reducing magnetic interference between the second magnet 22 and the third magnets 32, 32' is provided between the two second magnets 22 of each group. The magnetic pole of the magnetic conductive element 25 facing the magnetic pole face of the second lens holder 21 is the same and opposite to the magnetic pole of the second magnet 22 facing the magnetic pole face of the second lens holder 21. In this way, the third magnet 32' and the magnetic conductive member 25, which are close to each other, are in a paramagnetic attractive state, so that a suction area is formed in the middle between the first OIS motor and the second OIS motor, and a repulsive area is formed in both side portions (see fig. 7). Preferably, by providing the second magnet 22, the third magnets 32, 32' and the magnetic conductive member 25 in such a size and positional relationship that the attraction force in the attraction area is equal to the repulsion force in the repulsion area, a state in which the magnetic interference between the first OIS motor and the second OIS motor is close to zero can be achieved.

It will be appreciated that the piece of magnetically permeable element 25 remote from the third magnet 32' may be omitted or may be used as a position sensing magnet.

It is understood that in other embodiments, one or both of the first magnet and the second magnet may be single-sided bipolar or multi-stage magnets, and similar effects may be achieved.

While the invention has been described in conjunction with the specific embodiments above, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, all such alternatives, modifications, and variations are included within the scope of the appended claims.

Claims

1. A dual camera motor, comprising:

the lens comprises a first lens support and a second lens support, wherein the optical axis direction of a lens borne by one lens support is defined as a Z-axis direction, and two directions perpendicular to the Z-axis direction and mutually perpendicular to each other are defined as an X-axis direction and a Y-axis direction;

a first driving coil group for driving the first lens holder to move and two plate-shaped first magnets substantially parallel to a plane defined by the X-axis direction and the Z-axis direction; and

the second driving coil group is used for driving the second lens support to move, and four second magnets are arranged around the periphery of the second lens support;

the method is characterized in that:

in the initial state, the positions of the outer edges of the two first magnets in the Y-axis direction are located further outside than the positions of the outer edges of the second magnets in the Y-axis direction as viewed in the X-axis direction.

2. The dual camera motor of claim 1, wherein the distance between the positions of the outer edges of the two first magnets in the Y-axis direction and the position of the outer edge of the second magnet in the Y-axis direction is less than or equal to the thickness of the first magnets when viewed in the X-axis direction.

3. The dual camera motor of claim 2, wherein the magnetizing direction of the first magnet is parallel to the Y-axis direction and perpendicular to the Z-axis direction, and the magnetizing direction of the second magnet is at an angle of 45 ° to the X-axis or Y-axis direction and perpendicular to the Z-axis direction.

4. The dual camera motor of claim 3, wherein the first magnet and the second magnet are single sided single polarity magnets.

5. The dual camera motor of claim 4, wherein no corresponding magnetic conductive sheet is disposed between the two first magnets.

6. The dual camera motor of claim 5, wherein the second magnet is a plate-like magnet substantially parallel to the Z-axis direction, and is arranged in a circular array around the central axis of the second lens holder.

7. The dual camera motor of claim 6, wherein the two first magnets have the same magnetic poles facing the first lens frame and the four second magnets have the same magnetic poles facing the second lens frame.

8. The dual camera motor of claim 3, 4 or 5, further comprising two plate-shaped third magnets for driving the first lens holder to move substantially parallel to a plane defined by the Y-axis direction and the Z-axis direction; the four second magnets are divided into two groups positioned at two sides of the Y-axis direction, and a magnetic conduction element for reducing magnetic interference between the second magnets and the third magnets is arranged between the two second magnets of each group.

9. The dual camera motor of claim 8, wherein the two first magnets and the two third magnets have the same magnetic poles facing the first lens frame and the four second magnets have the same magnetic poles facing the second lens frame; when the magnetic conduction element is a single-sided monopole magnet, the magnetizing directions of the third magnet and the magnetic conduction element which are close to each other are the same.

10. The dual camera motor of claim 3, 4 or 5, further comprising two plate-shaped third magnets for driving the first lens holder to move substantially parallel to a plane defined by the Y-axis direction and the Z-axis direction, and a magnetic conductive member for reducing magnetic interference between the second magnets and the third magnets disposed between the two second magnets adjacent to the first magnets; the two first magnets and the two third magnets have the same magnetic poles facing one side of the first lens support and the same magnetic poles facing one side of the second lens support as the four second magnets; when the magnetic conduction element is a single-sided monopole magnet, the magnetization direction of the magnetic conduction element is the same as that of a third magnet close to the magnetic conduction element.