Lens driving device

• US 10,606,147 B2
• Filed: 10/22/2015
• Issued: 03/31/2020
• Est. Priority Date: 11/28/2014
• Status: Active Grant

• Current Assignee: Nidec Copal Corporation (Nidec Corporation)
• Original Assignee: Nidec Copal Corporation (Nidec Corporation)
• Inventors: Bai, Longji
• Primary Examiner(s): Pichler, Marin
• Application Number:
  US15/526,914
• Publication Number:
  US 20170322476A1
• Time in Patent Office: 1,622 Days
• Field of Search: 359557, 359824, 359825, 396 55
• CPC Class Codes: G02B 13/001 Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras G02B23/243 takes precedence
• 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 7/09 adapted for automatic focusing or varying magnification
• CPC Class Codes: G03B 13/36 Autofocus systems
• CPC Class Codes: G03B 2205/0015 by displacing one or more optical elements normal to the optical axis
• CPC Class Codes: G03B 3/10 Power-operated focusing
• CPC Class Codes: G03B 5/02 Lateral adjustment of lens
• CPC Class Codes: G03B 5/04 Vertical adjustment of lens; Rising fronts

Abstract

Disclosed is a lens driving device includes: a lens frame; a support frame that elastically supports the lens frame in the optical-axis direction through plate springs; a base support member that elastically supports the lens frame supported by the support frame, in a direction intersecting the optical axis, through support wires; and a driving unit that drives the lens frame in one or both of the optical-axis direction and the direction intersecting the optical axis. The plate springs include elastic arm sections, respectively, which project outward of a portion at which the support frame is attached; and wire attaching sections which are connected to the elastic arm sections, respectively. A connecting position at which the wire attaching section and the elastic arm section are attached to each other is disposed outward of a fixing position where the leading end portion of a corresponding one of the support wires is fixed to the wire attaching section.

Claims

1. A lens driving device comprising:

a lens frame;

a supporting frame for supporting the lens frame elastically in the optical axial direction through a leaf spring;

a base supporting member for supporting elastically the lens frame, which is supported on the supporting frame, in a direction that is perpendicular to the optical axis, through a supporting wire; and

a driving portion for driving the lens frame in the optical axial direction and in one or both directions that are perpendicular to the optical axis, wherein;

the leaf spring comprises an elastic arm portion that is pulled radially outward relative to the optical axis by a wire attaching portion that is connected to the elastic arm portion;

the wire attaching portion and the elastic arm portion meets at a connecting position;

a tip end portion of the supporting wire is secured to the wire attaching portion at a securing position;

a first imaginary line connects the securing position and the optical axis;

a second imaginary line passes through the securing position, perpendicular to the first imaginary line;

the connecting position is disposed on a side of the second imaginary line opposite from the optical axis; and

at least a portion of an inner side of the elastic arm portion is disposed on the side of the second imaginary line opposite from the optical axis.

2. The lens driving device as set forth in claim 1, wherein:

the leaf spring comprises a front side leaf spring wherein the front side of the lens frame is supported on the front side of the supporting frame, and a back side leaf spring wherein the back side of the lens frame is supported on the back side of the supporting frame; and

the elastic arm portion and the wire attaching portion are provided on the front side leaf spring.

3. The lens driving device as set forth in claim 2, wherein the leaf spring comprises a plurality of elastic arm portions connected to a plurality of wire attaching portions,

in the front side leaf spring, the elastic arm portions and the wire attaching portions are arranged axially symmetrically around the optical axis.

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

the elastic arm portion has a pair of arms on the left and right of the wire attaching portion.

5. A camera comprising the lens driving device as set forth in claim 1.

6. A mobile electronic device comprising the lens driving device as set forth in claim 1.