LENS HOLDING DEVICE

• US 20140307319A1
• Filed: 04/11/2014
• Published: 10/16/2014
• Est. Priority Date: 04/11/2013
• Status: Active Grant

• Current Assignee: TDK Corporation
• Original Assignee: TDK Corporation
• Inventors: UNO, Masaru, IMI, Kazutomo, KAWANO, Noriyuki, GOTOH, Masashi, INOUE, Kazuhiko, OHHATA, Osamu, KOIKE, Shintarou, YAMASHITA, Yasuhide
• Granted Patent: US 9,465,230 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: G03B 2205/0069 using electromagnetic actuators, e.g. voice coils
• CPC Class Codes: G03B 3/10 Power-operated focusing
• CPC Class Codes: H04N 23/685 performed by mechanical compensation

Abstract

A lens holding unit is held so that it can relatively move with respect to a base part to a direction vertical to an optical axis direction. The lens holding unit has a lens holder, a magnet part, and a spring. The lens holder has a first coil. The magnet part has a first magnet part which includes a first face facing to the first coil and a second magnet part which includes a second face vertical to the first face and constitutes a magnetic domain different from that of the first magnet part. These first magnet part and second magnet part are integrated.

Claims

1. A lens holding device comprising

a base part and

a lens holding unit held so as to move relatively with respect to the base part to a direction vertical to an optical axis direction;

wherein

the lens holding unit comprises a lens holder, a magnet part, and a spring,

the lens holder is connected with the magnet part by the spring so as to move relatively to the optical axis direction,

the lens holder comprises a first coil arranged around an outer circumference of a lens,

the magnet part comprises a first magnet part including a first face facing to the first coil and a second magnet part including a second face vertical to the first face and constituting a magnetic domain different from that of the first magnet part,

the first magnet part and the second magnet part are integrated, and

the base part comprises a second coil facing to the second face.

2. The lens holding device as set forth in claim 1, wherein at least one of the first magnet part and the second magnet part is continuous in a circumferential direction of the lens.

3. The lens holding device as set forth in claim 1, wherein the magnet part comprises an alignment part which positions the spring.

4. The lens holding device as set forth in claim 1, wherein

the spring comprises an incident side spring which is arranged at an incident side of the lens with respect to the first coil and an outgoing side spring which is arranged at an outgoing side of the lens with respect to the first coil and

the magnet part comprises an incident side alignment part which positions the incident side spring and an outgoing side alignment part which positions the outgoing side spring.

5. The lens holding device as set forth in claim 4, wherein a distance along the optical axis direction between the incident side alignment part and the outgoing side alignment part is substantially as long as a length of the lens holder along the optical axis direction.

6. The lens holding device as set forth in claim 3, wherein the second face of the second magnet part comprises a second face convex part and a second face concave part caved in the optical axis direction from the second face convex part so as to be apart from the second coil, and at least a part of the alignment part is provided on the second face concave part.

8. The lens holding device as set forth in claim 1, wherein the first magnet part and the second magnet part include a resin.

10. The lens holding device as set forth in claim 1, wherein

the second magnet part comprises a second end part located at an end part of the magnet part in the optical axis direction and a second intermediate part located at between the second end part and the first magnet part and constituting a magnetic domain different from those of the second end part and the first magnet part.

7. A lens holding device comprising

a base part and

a lens holding unit held so as to move relatively with respect to the base part to a direction vertical to an optical axis direction;

wherein

the lens holding unit comprises a lens holder, a magnet part, and a spring,

the lens holder is connected with the magnet part by the spring so as to move relatively to the optical axis direction,

the lens holder comprises a first coil arranged around an outer circumference of a lens,

the magnet part comprises a first magnet part including a first face facing to the first coil and a second magnet part including a second face vertical to the first face and constituting a magnetic domain different from that of the first magnet part,

the second magnet part is continuous in a circumferential direction of the lens, and

the base part comprises a second coil facing to the second face.

9. The lens holding device as set forth in claim 7, wherein the first magnet part and the second magnet part include a resin.

11. The lens holding device as set forth in claim 7, wherein

the second magnet part comprises a second end part located at an end part of the magnet part in the optical axis direction and a second intermediate part located at between the second end part and the first magnet part and constituting a magnetic domain different from those of the second end part and the first magnet part.