Voice coil motor, camera, and electronic device
View Patent ↗A voice coil motor includes an autofocus mechanism and an in-body image stabilization (IBIS) mechanism. The autofocus mechanism includes a first base, a cover, a coil assembly disposed between the first base and the cover, and a magnetic assembly arranged on the cover and around the coil assembly. The IBIS mechanism includes a second base disposed at one side of the first base away from the cover and a coil module arranged on the second base. When the coil assembly is energized, a first electromagnetic force is generated between the coil assembly and the magnetic assembly to drive the coil assembly to move in an axial direction, thereby achieving an autofocusing function. When the coil module is energized, a second electromagnetic force is generated between the coil module and the magnetic assembly to drive the second base and the coil module to move relative to the first base.
1 . A voice coil motor, comprising:
an autofocus mechanism and an in-body image stabilization (IBIS) mechanism;
wherein the autofocus mechanism comprises a first base, a cover arranged on the first base, a coil assembly disposed between the first base and the cover, and a magnetic assembly arranged on the cover and around the coil assembly;
wherein the IBIS mechanism comprises a second base disposed at one side of the first base away from the cover and a coil module arranged on the second base; when the coil assembly is energized, a first electromagnetic force is generated between the coil assembly and the magnetic assembly to drive the coil assembly to move in an axial direction, wherein the axial direction is a direction parallel to a center axis of the coil assembly; and
wherein when the coil module is energized, a second electromagnetic force is generated between the coil module and the magnetic assembly to drive the second base and the coil module to move relative to the first base;
wherein the second base is provided with a magnetic conductive member corresponding to the magnetic assembly, the magnetic conductive member and the magnetic assembly are configured to magnetically attract each other, the second base is connected to the first base through a plurality of universal balls, and the second base is spaced apart from the first base.
2 . The voice coil motor of claim 1 , wherein the second electromagnetic force between the coil module and the magnetic assembly is configured to:
drive the second base and the coil module to move relative to the first base along a plane perpendicular to the axial direction; or
drive the second base and the coil module to rotate relative to the first base about an axis parallel to the axial direction.
3 . The voice coil motor of claim 2 , wherein the magnetic assembly comprises at least one pair of first magnetic members, and the coil module comprises at least one pair of first coils corresponding to the at least one pair of first magnetic members, wherein when the at least one pair of first coils is energized, a first component of the second electromagnetic force is generated between the at least one pair of first coils and the at least one pair of first magnetic members to drive the second base and the coil module to move relative to the first base in a first direction, and the first direction is perpendicular to the axial direction.
4 . The voice coil motor of claim 3 , wherein the magnetic assembly comprises at least one pair of second magnetic members, and the coil module comprises at least one pair of second coils corresponding to the at least one pair of second magnetic members, wherein when the at least one pair of second coils is energized, and a second component of the second electromagnetic force is generated between the at least one pair of second coils and the at least one pair of second magnetic members to drive the second base and the coil module to move relative to the first base in a second direction, and the second direction is perpendicular to the first direction and the axial direction.
5 . The voice coil motor of claim 4 , wherein the at least one pair of first coils and the at least one pair of second coils are configured to be energized, so that a component of the second electromagnetic force generated between the at least one pair of first coils and the at least one pair of first magnetic members is different from another component of the second electromagnetic force generated between the at least one pair of second coils and the at least one pair of second magnetic members, and the second base and the coil module are driven by the second electromagnetic force to rotate relative to the first base about the axis parallel to the axial direction.
6 . The voice coil motor of claim 4 , wherein the IBIS mechanism further comprises a flexible circuit board electrically connected to the coil module, the flexible circuit board is provided with a first magnetic induction driving element corresponding to the first magnetic member and a second magnetic induction driving element corresponding to the second magnetic member, wherein an orthogonal projection of the first magnetic induction driving element on the magnetic assembly falls within the first magnetic member, and an orthogonal projection of the second magnetic induction driving element on the magnetic assembly falls within the second magnetic member.
7 . The voice coil motor of claim 1 , wherein the second base is provided with a plurality of positioning portions around the coil assembly at one side of the second base facing the first base, the plurality of positioning portions are arranged in at least one circle in a circumferential direction of the coil assembly, and each of the plurality of universal balls is rotatably disposed in a corresponding one of the plurality of positioning portions.
8 . The voice coil motor of claim 1 , wherein the first base defines a plurality of first ball grooves on a side surface of the first base facing the second base, the plurality of first ball grooves are arranged in at least one circle in a circumferential direction of the coil assembly, wherein the second base defines a plurality of second ball grooves on a side surface of the second base facing the first base, the plurality of second ball grooves respectively correspond to the plurality of first ball grooves, and each of the plurality of first ball grooves and a corresponding one of the plurality of second ball grooves cooperate to receive the universal ball.
9 . The voice coil motor of claim 7 , wherein a first anti-collision member is disposed at a position where the first base is in contact with the universal ball, and a second anti-collision member is disposed at a position where the positioning portion is in contact with the universal ball.
10 . The voice coil motor of claim 1 , wherein a magnetic conductive member is disposed in the cover, and the magnetic assembly and the magnetic conductive member are configured to attract each other to position the magnetic assembly to the cover.
11 . The voice coil motor of claim 1 , wherein the cover is provided with a plurality of damping pins extending towards the coil assembly, the coil assembly comprises a carrier, the carrier defines a plurality of damping holes respectively corresponding to the plurality of damping pins, and each of the plurality of damping pins is inserted into a corresponding one of the plurality of damping holes.
12 . The voice coil motor of claim 11 , wherein each of the plurality of damping holes is provided with a damping material.
13 . The voice coil motor of claim 11 , wherein the carrier is provided with a plurality of first collision bosses at a surface of the carrier close to the cover and a plurality of second collision bosses at a surface of the carrier close to the first base.
14 . The voice coil motor of claim 1 , wherein the autofocus mechanism further comprises a first resilient member connected between the coil assembly and the cover and a second resilient member connected between the coil assembly and the first base, and the first resilient member and the second resilient member are configured to move the coil assembly to reset.
15 . The voice coil motor of claim 1 , further comprising a circuit board module disposed at one side of the second base away from the first base, wherein the circuit board module is electrically connected to the coil assembly and the coil module.
16 . The voice coil motor of claim 15 , wherein the circuit board module comprises a bottom plate arranged on the second base and a conductive member connected to and surrounding the bottom plate, the bottom plate is electrically connected to the coil module, the conductive member is electrically connected to the coil assembly, and an avoidance groove is defined between part of the conductive member and the bottom plate.
17 . The voice coil motor of claim 16 , wherein a metal wire is disposed inside the cover and electrically connected to the coil assembly, and one end of the metal wire extends outside of the cover to be connected to the conductive member.
18 . A camera, comprising:
a voice coil motor, a lens module, and a photosensitive chip disposed at the voice coil motor; wherein
wherein the voice coil motor comprises an autofocus mechanism and an in-body image stabilization (IBIS) mechanism;
wherein the autofocus mechanism comprises a first base, a cover arranged on the first base, a coil assembly disposed between the first base and the cover, and a magnetic assembly arranged on the cover and around the coil assembly;
wherein the IBIS mechanism comprises a second base disposed at one side of the first base away from the cover and a coil module arranged on the second base; when the coil assembly is energized, a first electromagnetic force is generated between the coil assembly and the magnetic assembly to drive the coil assembly to move in an axial direction, wherein the axial direction is a direction parallel to a center axis of the coil assembly; and
wherein when the coil module is energized, a second electromagnetic force is generated between the coil module and the magnetic assembly to drive the second base and the coil module to move relative to the first base; and
wherein the lens module is connected to the coil assembly of the voice coil motor, the voice coil motor is configured to drive the coil assembly to move so that the lens module is driven to move under movement of the coil assembly, and the voice coil motor is further configured to drive the photosensitive chip to move relative to the lens module;
wherein the second base is provided with a magnetic conductive member corresponding to the magnetic assembly, the magnetic conductive member and the magnetic assembly are configured to magnetically attract each other, the second base is connected to the first base through a plurality of universal balls, and the second base is spaced apart from the first base.
19 . An electronic device, comprising:
a housing, a main board disposed inside the housing, and a camera, the camera comprising a voice coil motor, a lens module, and a photosensitive chip disposed at the voice coil motor, and the camera being disposed inside the housing and electrically connected to the main board;
wherein the voice coil motor comprises an autofocus mechanism and an in-body image stabilization (IBIS) mechanism;
wherein the autofocus mechanism comprises a first base, a cover arranged on the first base, a coil assembly disposed between the first base and the cover, and a magnetic assembly arranged on the cover and around the coil assembly;
wherein the IBIS mechanism comprises a second base disposed at one side of the first base away from the cover and a coil module arranged on the second base; when the coil assembly is energized, a first electromagnetic force is generated between the coil assembly and the magnetic assembly to drive the coil assembly to move in an axial direction, wherein the axial direction is a direction parallel to a center axis of the coil assembly; and
wherein when the coil module is energized, a second electromagnetic force is generated between the coil module and the magnetic assembly to drive the second base and the coil module to move relative to the first base;
wherein the second base is provided with a magnetic conductive member corresponding to the magnetic assembly, the magnetic conductive member and the magnetic assembly are configured to magnetically attract each other, the second base is connected to the first base through a plurality of universal balls, and the second base is spaced apart from the first base; and
wherein the lens module is connected to the coil assembly of the voice coil motor, the voice coil motor is configured to drive the coil assembly to move so that the lens module is driven to move under movement of the coil assembly, and the voice coil motor is further configured to drive the photosensitive chip to move relative to the lens module.