LENS DRIVING DEVICE AND METHOD OF MANUFACTURING THE SAME

• US 20150022891A1
• Filed: 06/30/2014
• Published: 01/22/2015
• Est. Priority Date: 07/22/2013
• Status: Active Grant

• Current Assignee: Tdk Taiwan Corp. (TDK Corporation)
• Original Assignee: Tdk Taiwan Corp. (TDK Corporation)
• Inventors: HU, Chao-Chang, CHEN, Yi-Ho
• Granted Patent: US 9,465,231 B2
• Time in Patent Office: Days
• US Class Current: 359/557
• CPC Class Codes: G02B 27/646 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 Class Codes: G02B 7/08 adapted to co-operate with a remote control mechanism
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine

Abstract

The present invention discloses a lens driving device and a method of manufacturing the same. In the present invention, there is provided a lens driving device comprising: a lens having an optical axis; a focusing coil disposed at a periphery of the lens with respect to the optical axis; a vibration correction coil set comprising a plurality of coils and disposed on a flat surface perpendicular to the optical axis; and a plurality of magnets disposed at the periphery of the lens with respect to the optical axis, each of which having a first surface facing the focusing coil and a second surface facing a corresponding one of respective coils of the vibration correction coil set; wherein the focusing coil acts on the first surface of each of the plurality of magnets to cause an assembly including the lens and the focusing coil to move in the optical axis direction with respect to the plurality of magnets; and wherein a direction in which one coil of the vibration correction coil set acts on the second surface of one of the plurality of magnets is the same as directions in which another two coils of the vibration correction coil set act respectively on the second surfaces of another two magnets of the plurality of magnets respectively so as to cause an assembly including the lens, the focusing coil and the plurality of magnets to move in a direction perpendicular to the optical axis with respect to the vibration correction coil set.

Claims

1. A lens driving device, comprising:

a lens having an optical axis;

a focusing coil disposed at a periphery of the lens with respect to the optical axis;

a vibration correction coil set comprising a plurality of coils and disposed on a flat surface perpendicular to the optical axis; and

a plurality of magnets disposed at the periphery of the lens with respect to the optical axis, each of which having a first surface facing the focusing coil and a second surface facing a corresponding one of respective coils of the vibration correction coil set;

wherein the focusing coil acts on the first surface of each of the plurality of magnets to cause an assembly including the lens and the focusing coil to move in the optical axis direction with respect to the plurality of magnets;

and wherein a direction in which one coil of the vibration correction coil set acts on the second surface of one of the plurality of magnets is the same as directions in which another two coils of the vibration correction coil set act respectively on the second surfaces of another two magnets of the plurality of magnets so as to cause an assembly including the lens, the focusing coil and the plurality of magnets to move in a direction perpendicular to the optical axis with respect to the vibration correction coil set.

2. The lens driving device according to claim 1 further comprising at least one Hall element disposed between the another two coils of the vibration correction coil set and facing the second surfaces in a projection direction parallel to the optical axis without being blocked by the another two coils.

3. The lens driving device according to claim 1, wherein a vibration-absorbing gel is disposed in a gap defined by the another two magnets and a coil plate provided with the vibration correction coil set, and the vibration-absorbing gel contacts at least partially with the another two magnets and the coil plate.

4. The lens driving device according to claim 1 further comprising a frame receiving a plurality of magnets, wherein the frame has a side wall between the another two magnets and the side wall has a height slightly smaller than a thickness of each of the another two magnets.

5. A method of manufacturing a lens driving device mounted on an image sensor and a sensor substrate, comprising the steps of:

disposing a focusing coil at a periphery of a lens;

disposing a vibration correction coil set comprising a plurality of coils on a flat surface perpendicular to an optical axis of the lens; and

disposing a plurality of magnets at the periphery of the lens, wherein each of the plurality of magnets has a first surface configured to face the focusing coil and a second surface configured to face a corresponding one of respective coils of the vibration correction coil set, and characterized in that;

the focusing coil acts on the first surface of each of the plurality of magnets to cause an assembly including the lens and the focusing coil to move in the optical axis direction with respect to the plurality of magnets; and

that

a direction in which one coil of the vibration correction coil set acts on the second surface of one of the plurality of magnets is the same as directions in which another two coils of the vibration correction coil set act respectively on the second surfaces of another two magnets of the plurality of magnets so as to cause an assembly including the lens, the focusing coil and the plurality of magnets to move in a direction perpendicular to the optical axis with respect to the vibration correction coil set.

6. The method of manufacturing a lens driving device according to claim 5 further comprising the step of:

disposing at least one Hall element between the another two coils of the vibration correction coil set and causing the at least one Hall element to face the second surfaces in a projection direction parallel to the optical axis without being blocked by the another two coils.

7. The method of manufacturing a lens driving device according to claim 5 further comprising the step of:

disposing at least one vibration-absorbing gel in a gap defined by the another two magnets and a coil plate provided with the vibration correction coil set so that the at least one vibration-absorbing gel contacts at least partially with the another two magnets and the coil plate.

8. The method of manufacturing a lens driving device according to claim 5 further comprising the step of:

disposing a frame receiving the plurality of magnets, wherein the frame has a side wall between the another two magnets and the side wall has a height slightly smaller than a thickness of each of the another two magnets.