LENS DRIVING DEVICE

• US 20130194683A1
• Filed: 01/30/2013
• Published: 08/01/2013
• Est. Priority Date: 01/30/2012
• Status: Active Grant

• Current Assignee: Nidec Copal Corporation (Nidec Corporation)
• Original Assignee: Nidec Copal Corporation (Nidec Corporation)
• Inventors: MACHIDA, Takuya, SHIKAMA, Kazuo, MANDAI, Haruhiko, EHARA, Yusuke, WATANABE, Nobuaki
• Granted Patent: US 8,711,497 B2
• Time in Patent Office: Days
• US Class Current: 359/814
• 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 7/04 with mechanism for focusing or varying magnification
• CPC Class Codes: G02B 7/08 adapted to co-operate with a remote control mechanism
• CPC Class Codes: H02K 41/0356 moving along a straight path

Abstract

A lens driving device includes a base member, a movable member that is disposed at the base member and moves in a plane that is orthogonal to an optical axis, a first driving portion that moves the movable member in a direction that is orthogonal to the optical axis in accordance with image shake, a lens frame that is mounted to the movable member and moves in a direction of the optical axis, a second driving portion that moves the lens frame in the direction of the optical axis and includes a first magnet that is secured to the movable member and a first coil that is secured to the lens frame, and a Hall element that is disposed so as to oppose the first magnet in the direction of the optical axis and detects a change in a magnetic field of the first magnet.

Claims

1. A lens driving device comprising:

a base member;

a movable member that is disposed at the base member and moves in a plane that is orthogonal to an optical axis;

a first driving portion that moves the movable member in a direction that is orthogonal to the optical axis in accordance with image shake;

a lens frame that is mounted to the movable member and moves in a direction of the optical axis;

a second driving portion that moves the lens frame in the direction of the optical axis, the second driving portion including a first magnet that is secured to the movable member and a first coil that is secured to the lens frame; and

a Hall element that is disposed so as to oppose the first magnet in the direction of the optical axis, the Hall element detecting a change in a magnetic field of the first magnet.

2. The lens driving device according to claim 1, wherein the first driving portion includes a second magnet that is secured to the movable member and a second coil that is secured to the base member so as to oppose the second magnet in the direction of the optical axis.

3. The lens driving device according to either claim 1 or claim 2, wherein at least two of the Hall elements are provided, the at least two of the Hall elements being disposed so as to oppose the first magnet in the direction of the optical axis and being disposed with a phase angle of degrees around the optical axis in the plane that is orthogonal to the optical axis.