Lens device

Patent metadata

Field	Value
Publication number	US-2018157059-A1
Application number	US-201615388946-A
Country	US
Kind code	A1
Filing date	Dec 22, 2016
Priority date	Dec 5, 2016
Publication date	Jun 7, 2018
Grant date	—

Abstract

A lens device comprises a connect assembly, a lens assembly and a drive assembly. The lens assembly is disposed on the connect assembly and has a central axis. The drive assembly comprises a first coil, a magnet and a second coil. The first coil is wound around the lens assembly. The magnet is disposed on the connect assembly and has a first magnetic pole, a second magnetic pole, a first direction of magnetic field and a second direction of magnetic field. The first direction of magnetic field and the second direction of magnetic field are not parallel to each other. The first direction of magnetic field points toward the first coil. The second coil is disposed on the connect assembly. The second direction of magnetic field points toward a part of the second coil.

First claim

What is claimed is:

1 . A lens device, comprising:
a connect assembly; a lens assembly, disposed on the connect assembly, and the lens assembly having a central axis; and a drive assembly, comprising:
a first coil wound around the lens assembly;
at least one magnet disposed on the connect assembly, the at least one magnet having a first magnetic pole, a second magnetic pole, a first direction of magnetic field and a second direction of magnetic field, the first direction of magnetic field taken to be inward to/outward from the first magnetic pole of the magnet, the second direction of magnetic field taken to be inward to/outward from the second magnetic pole, the first direction of magnetic field and the second direction of magnetic field not parallel to each other, the first direction of magnetic field pointing toward the first coil or pointing away from the first coil, and the first coil configured for driving the lens assembly to move substantially along the central axis by interacting with the first magnetic pole; and
at least one second coil disposed on the connect assembly, the second direction of magnetic field pointing toward a part of the at least one second coil or pointing away from the part of the at least one second coil, and the at least one second coil configured for driving the lens assembly, the at least one magnet and the first coil to move along a direction other than the central axis by interacting with the second magnetic pole.

2 . The lens device according to claim 1 , wherein the first coil is wound around the lens assembly with the central axis taken as a winding axis, and the at least one second coil is wound around another winding axis which is substantially parallel to the central axis.

3 . The lens device according to claim 1 , wherein the quantity of the at least one magnet is plural, the quantity of the at least one second coil and the quantity of the magnet are the same, the plurality of magnets surround the lens assembly, and the plurality of second coils respectively correspond to the plurality of magnets.

4 . The lens device according to claim 1 , wherein the quantity of the at least one magnet is one, the magnet surrounds the lens assembly, the quantity of the at least one second coil is plural, and the plurality of second coils surround the lens assembly.

5 . The lens device according to claim 1 , wherein the at least one magnet is disposed on the lens assembly and located between the lens assembly and the first coil, and the at least one magnet and the lens assembly are movable substantially along the central axis relative to the first coil.

6 . The lens device according to claim 1 , wherein the first coil is disposed on the lens assembly, a part of the first coil is located between the lens assembly and the at least one magnet, and the first coil and the lens assembly are movable substantially along the central axis relative to the at least one magnet.

7 . The lens device according to claim 1 , wherein the connect assembly comprises a base plate, at least one flexible support, a frame and at least one flexible connection, the at least one second coil is disposed on the base plate, the at least one flexible support is disposed on the base plate and surrounds the lens assembly, the frame surrounds the lens assembly and is supported by the at least one flexible support, the at least one flexible connection is configured for connecting the frame and the lens assembly.

8 . The lens device according to claim 7 , wherein the lens device further comprises a lens seat, surrounding the lens assembly and configured for connecting the lens assembly and the at least one magnet.

9 . The lens device according to claim 1 , wherein the second direction of magnetic field is substantially parallel to the central axis.

10 . The lens device according to claim 1 , wherein an extension direction of a part of the at least one second coil is substantially perpendicular to the second direction of magnetic field.

11 . The lens device according to claim 1 , wherein the first direction of magnetic field points substantially toward the central axis or points away from the central axis.

12 . The lens device according to claim 1 , wherein the first direction of magnetic field is substantially perpendicular to the central axis.

13 . The lens device according to claim 1 , wherein an extension direction of a part of the first coil is substantially perpendicular to the first direction of magnetic field.

14 . A lens device, comprising:
a connect assembly; a lens assembly, disposed on the connect assembly, and the lens assembly having a central axis; and a drive assembly, comprising:
at least one first magnet, disposed on the lens assembly, the at least one first magnet having a first magnetic pole, a first direction of magnetic field taken to be inward to/outward from the first magnetic pole of the at least one first magnet;
a first coil disposed on the connect assembly, the at least one first magnet being between the first coil and the lens assembly, the first direction of magnetic field pointing toward the first coil or pointing away from the first coil, the first coil configured for driving the lens assembly and the at least one first magnet to move substantially along the central axis by interacting with the first magnetic pole;
at least one second magnet, disposed on the lens assembly or the first coil, the at least one second magnet having a second magnetic pole, a second direction of magnetic field taken to be inward to/outward from the second magnetic pole of the at least one second magnet, the first direction of magnetic field and the second direction of magnetic field not parallel to each other; and
at least one second coil disposed on the connect assembly, the second direction of magnetic field pointing toward the at least one second coil or pointing away from the at least one second coil, the at least one second coil configured for driving the lens assembly, the at least one first magnet and the at least one second magnet to move along a direction other than the central axis by interacting with the second magnetic pole.

15 . The lens device according to claim 14 , wherein the first coil is wound around the lens assembly and the at least one first magnet with the central axis taken as a winding axis, and the at least one second coil is wound around another winding axis which is substantially parallel to the central axis.

16 . The lens device according to claim 14 , wherein the quantity of the at least one second magnet is plural, the quantity of the at least one second coil and the quantity of the at least one second magnet are the same, the plurality of second magnets surround the lens assembly, the plurality of second coils respectively correspond to the plurality of second magnets.

17 . The lens device according to claim 14 , wherein the connect assembly comprises a base plate, at least one flexible support, a frame, and at least one flexible connection, the at least one second coil is disposed on the base plate, the at least one flexible support is disposed on the base plate and surrounds the lens assembly, the frame surrounds the lens assembly, and is supported by the at least one flexible support, the first coil is disposed on the frame, the at least one first magnet and the lens assembly are movable substantially along the central axis relative to the frame and the first coil, the at least one flexible connection is configured for connecting the frame and the lens assembly.

18 . The lens device accordin

Assignees

• Ind Tech Res Inst

Inventors

• Ma Shou-Cheng
• Lin Cheng-Hsuan
• Peng Wen-Yang
• Huang Chieh-Yi
• Jang Chau-Shin

Classifications

• H02K41/0356

  moving along a straight path · CPC title

• G02B7/08

  adapted to co-operate with a remote control mechanism · CPC title

• G02B27/646 Primary

  compensating for small deviations, e.g. due to vibration or shake (movement of one or more optical elements for control of motion blur in cameras, projectors or printers G03B2205/0007; image stabilisation in cameras peculiar to the presence or use of an electronic image sensor H04N23/68) · CPC title

• G02B7/10 Primary

  by relative axial movement of several lenses, e.g. of varifocal objective lens · CPC title

• G03B13/34

  Power focusing · CPC title