Camera-shake correction device

• US 9,013,588 B2
• Filed: 08/12/2010
• Issued: 04/21/2015
• Est. Priority Date: 08/21/2009
• Status: Expired due to Fees

• Current Assignee: Mitsumi Electric Co., Ltd. (MinebeaMitsumi Inc.)
• Original Assignee: Mitsumi Electric Co., Ltd. (MinebeaMitsumi Inc.)
• Inventors: Moriya, Akihiro, Sugawara, Masayoshi
• Primary Examiner(s): Daniels, Anthony J
• Application Number:
  US13/390,603
• Publication Number:
  US 20120154614A1
• Time in Patent Office: 1,713 Days
• Field of Search: 348/208.99, 348/345
• US Class Current: 348/208.99
• 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 7/08 adapted to co-operate with a remote control mechanism
• 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 17/00 Details of cameras or camera bodies; Accessories therefor lens hoods or caps G03B11/04
• CPC Class Codes: G03B 17/02 Bodies
• CPC Class Codes: G03B 2205/0015 by displacing one or more optical elements normal to the optical axis
• CPC Class Codes: G03B 2205/0069 using electromagnetic actuators, e.g. voice coils
• CPC Class Codes: G03B 3/00 Focusing arrangements of general interest for cameras, projectors or printers
• CPC Class Codes: G03B 3/10 Power-operated focusing
• CPC Class Codes: G03B 5/00 Adjustment of optical system relative to image or object surface other than for focusing
• CPC Class Codes: H04N 23/54 Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
• CPC Class Codes: H04N 23/55 Optical parts specially adapted for electronic image sensors; Mounting thereof
• CPC Class Codes: H04N 23/57 Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
• CPC Class Codes: H04N 23/68 for stable pick-up of the scene, e.g. compensating for camera body vibrations
• CPC Class Codes: H04N 23/682 Vibration or motion blur correction
• CPC Class Codes: H04N 23/687 by shifting the lens or sensor position
• CPC Class Codes: H04N 25/00 Circuitry of solid-state image sensors [SSIS]; Control thereof

Abstract

A small size, low profile camera-shake correction device. A camera-shake correction device (10) corrects camera shake by moving the entire auto-focusing lens drive device (20) in a first direction (X) and a second direction (Y) which are perpendicular to the optical axis (O) and are perpendicular to each other, the auto-focusing lens drive device (20) being provided with a focusing coil (26) and a permanent magnet (28) which is disposed on the outside of the focusing coil. The camera-shake correction device (10) includes: a base (14) disposed so as to be spaced from the bottom surface of the auto-focusing lens drive device (20); suspension wires (16) which each have one end affixed to the outer peripheral section of the base, which extend along the optical axis (O), and which support the entire auto-focusing lens drive device (20) in such a manner that the auto-focusing lens drive device (20) is rockable in the first direction (X) and the second direction (Y); and a camera-shake correcting coil (18) disposed so as to face the permanent magnet (28).

Claims

1. A camera-shake correction apparatus that corrects camera shake by moving all or a moving part of an auto-focusing lens drive apparatus for moving a lens barrel along an optical axis in a first direction and second direction that are perpendicular to said optical axis and that are perpendicular to each other, wherein said auto-focusing lens drive apparatus includes:

a focusing coil,

a permanent magnet disposed on an outer radial-direction side of that focusing coil with respect to said optical axis, facing that focusing coil,

a lens holder having a tubular section that supports said lens barrel, said lens holder fixing said focusing coil so as to be positioned around said tubular section,

a magnet holder that is disposed on an outer periphery of said lens holder and supports said permanent magnet, and

a pair of leaf springs that support said lens holder so as to be displaceable in said optical axis direction when positioned in a radial direction, and

said camera-shake correction apparatus comprising;

a base disposed so as to be spaced from a bottom surface of said auto-focusing lens drive apparatus,

a plurality of suspension wires one end of each of which is fixed by an outer peripheral section of said base, said plurality of suspension wires extending along said optical axis and supporting all or a moving part of said auto-focusing lens drive apparatus so as to be able to rock in said first direction and said second direction, and

a camera-shake correction coil disposed so as to face said permanent magnet, wherein;

said permanent magnet is composed of a plurality of first permanent magnet sections and a plurality of second permanent magnet sections that are disposed so as to face each other in said first direction and said second direction and disposed so as to be spaced from each other in said optical axis direction, said first permanent magnet sections and second permanent magnet sections are polarized into a north (N) pole and a south (S) pole in a radial direction, and said first permanent magnet sections and second permanent magnet sections have magnetic poles that differ in said optical axis direction;

said focusing coil is composed of a first and second focusing coil that are fixed around a tubular section of said lens holder, facing said plurality of first permanent magnet sections and said plurality of second permanent magnet sections respectively;

said camera-shake correction coil is composed of a plurality of camera-shake correction coils that are disposed inserted between said plurality of first permanent magnet sections and said plurality of second permanent magnet sections; and

said camera-shake correction apparatus has a ring-shaped coil board on which said plurality of camera-shake correction coils are formed.

2. The camera-shake correction apparatus according to claim 1, wherein:

said base is composed of a ring-shaped base section and a tubular section that projects upward in said optical axis direction from an outer edge of the ring-shaped base section;

said coil board is fixed to an upper end of said tubular section of said base; and

said pair of leaf springs are fixed in a linked fashion between said lens holder and said magnet holder.

3. The camera-shake correction apparatus according to claim 2, wherein:

said plurality of suspension wires rise up from an outer peripheral section of said ring-shaped base section;

said magnet holder has an upper ring-shaped end section, and said upper ring-shaped end section has a plurality of wire insertion holes into which other ends of said plurality of suspension wires are inserted; and

of said pair of leaf springs, an upper leaf spring has a plurality of wire fixing holes into which other ends of said plurality of suspension wires are inserted.

4. The camera-shake correction apparatus according to claim 3, wherein said coil board has a plurality of through-holes through which said plurality of suspension wires pass.

5. The camera-shake correction apparatus according to any one of claims 2 through 4, further comprising:

a position detection section for detecting a position of said auto-focusing lens drive apparatus with respect to said base.

6. The camera-shake correction apparatus according to claim 5, wherein said position detection section is composed of at least two Hall devices that are mounted on said base section, and that are disposed so as to face and be spaced from at least two second permanent magnet sections disposed in said first direction and said second direction among said plurality of second permanent magnet sections.

7. The camera-shake correction apparatus according to claim 5, wherein:

said position detection section is composed of at least two photoreflectors and at least two position information sections, disposed so as to face each other;

said at least two position information sections are disposed in said first direction and said second direction on an underside of a lower leaf spring lower in said optical axis direction, of said pair of leaf springs; and

said at least two photoreflectors are mounted on said base section, and are disposed so as to be spaced from and face said at least two position information sections respectively.

8. The camera-shake correction apparatus according to claim 1, wherein:

said camera-shake correction apparatus further comprising a coil holder that holds said coil board;

said base is composed of a ring-shaped base section and a tubular section having a plurality of rectangular apertures that projects upward in said optical axis direction from an outer edge of said ring-shaped base section;

said magnet holder is composed of a plurality of magnet holders each holding one of said first permanent magnet sections and one of said second permanent magnet sections;

said plurality of magnet holders are fixed inserted into said plurality of apertures of a tubular section of said base; and

said pair of leaf springs are fixed in a linked fashion between said lens holder and said coil holder.

9. The camera-shake correction apparatus according to claim 8, wherein:

said plurality of suspension wires rise up in pairs from an outer peripheral section of said base section; and

said coil holder has an upper ring-shaped end section and a plurality of projecting sections that project in an outward radial direction from an outer peripheral section of that upper ring-shaped end section, and said plurality of projecting sections have a plurality of wire fixing holes into which other ends of said plurality of suspension wires are inserted.

10. The camera-shake correction apparatus according to claim 8 or 9, further comprising:

a position detection section for detecting a position of a moving part of said camera-shake correction apparatus with respect to said base.

11. The camera-shake correction apparatus according to claim 10, wherein:

said coil holder further comprises a lower ring-shaped end section;

said position detection section is composed of at least two photoreflectors and at least two position information sections that are disposed so as to face each other;

said at least two position information sections are disposed in said first direction and said second direction Y on an underside of said lower ring-shaped end section of said coil holder; and

said at least two photoreflectors are mounted on said ring-shaped base section, and are disposed so as to be spaced from and face said at least two position information sections respectively.