Shake correction mechanism and image sensing apparatus using the same

• US 20060033818A1
• Filed: 11/17/2004
• Published: 02/16/2006
• Est. Priority Date: 08/12/2004
• Status: Active Grant

• Current Assignee: Konica Minolta Photo Imaging Incorporated (Konica Minolta Inc.)
• Original Assignee: Konica Minolta Photo Imaging Incorporated (Konica Minolta Inc.)
• Inventors: Wada, Shigeru, Tanii, Junichi
• Granted Patent: US 7,623,159 B2
• Time in Patent Office: Days
• US Class Current: 348/208.110
• CPC Class Codes: G03B 17/00 Details of cameras or camera bodies; Accessories therefor lens hoods or caps G03B11/04
• CPC Class Codes: H04N 23/68 for stable pick-up of the scene, e.g. compensating for camera body vibrations
• CPC Class Codes: H04N 23/687 by shifting the lens or sensor position

Abstract

A shake correction mechanism 1 has an elastic support member 2 for elastically and oscillatingly supporting a lens barrel 10 at one point, and first and second actuators 3a and 3b for applying oscillating forces to the lens barrel 10. When a moment is applied to the lens barrel 10 by the first and second actuators 3a and 3b, the elastic support member 2 is subjected to elastic deformation. Thereby, the lens barrel 10 is oscillated to tilt the optical axis thereof in a desires direction. Thus, the lens barrel 10 is oscillatingly driven without use of a rotary joint or the like as employed in the conventional gimbal mechanism. This arrangement enables to miniaturize the shake correction mechanism.

Claims

1. A shake correction mechanism comprising:

a lens barrel;

a support mechanism that oscillatingly supports the lens barrel; and

an actuator unit that applies an oscillating force to the lens barrel,

the support mechanism including an elastic support member that elastically supports the lens barrel at one point thereof,

the lens barrel being operative to tilt at least an optical axis thereof when an oscillating force is applied to the lens barrel by the actuator unit, and

the elastic support member being subjected to elastic deformation when the oscillating force is applied to the lens barrel by the actuator unit.

2. The shake correction mechanism according to claim 1, further comprising a rotation regulating unit that regulates a rotation amount of the lens barrel about an axis parallel with the optical axis of the lens barrel, the axis including the support point of the lens barrel by the elastic support member.

3. The shake correction mechanism according to claim 2, further comprising an unmovable base block wherein

the rotation regulating unit includes a shaft member and a guide member that guides the shaft member, and

the shaft member is pivotally supported on the base block or the lens barrel, and the shaft member is integrally formed with an outer wall of the lens barrel or the base block.

4. The shake correction mechanism according to claim 1, further comprising a tilt regulating member that regulates a tilt range of the lens barrel with respect to the optical axis of the lens barrel.

5. The shake correction mechanism according to claim 4, wherein

the tilt regulating member includes a pin that is arranged as opposed to a part of the lens barrel for contact with the part of the lens barrel, and

the pin is arranged on an oscillation trajectory along which a centroid of the lens barrel is moved relative to the support point of the lens barrel by the elastic support member.

6. The shake correction mechanism according to claim 4, wherein the tilt regulating member includes a pin that is arranged as opposed to the part of the lens barrel for contact with the part of the lens barrel at or around a point farthest away from the support point of the lens barrel by the elastic support member.

7. The shake correction mechanism according to claim 1, wherein the lens barrel is supported by the elastic support member at one point on a bottom surface thereof, and the actuator unit includes a first actuator that oscillates the lens barrel along a first plane which includes the support point of the lens barrel by the elastic support member and extends in a direction of the optical axis of the lens barrel, and a second actuator that oscillates the lens barrel along a second plane which includes the support point of the lens barrel by the elastic support member and intersects perpendicular to the first plane.

8. The shake correction mechanism according to claim 7, further comprising a base block as an attachment base for the lens barrel, wherein the first actuator and the second actuator each comprises a moving coil unit including a magnet and a coil, either one of the magnet and the coil of the moving coil unit is attached to a flange portion formed on a rear end portion of the lens barrel, and the other one of the coil and the magnet of the moving coil unit is attached to the base block.

9. The shake correction mechanism according to claim 7, wherein the support point of the lens barrel by the elastic support member is disposed away from the bottom surface of the lens barrel.

10. The shake correction mechanism according to claim 1, wherein the lens barrel is supported by the elastic support member at one point substantially in an axial middle on a side wall thereof, and the actuator unit includes a first actuator that oscillates the lens barrel along a first plane which includes the support point of the lens barrel by the elastic support member and the optical axis of the lens barrel, and extends in a direction of the optical axis of the lens barrel, and a second actuator that oscillates the lens barrel along a second plane which includes the optical axis of the lens barrel and intersects perpendicular to the first plane.

11. The shake correction mechanism according to claim 10, further comprising a base block as an attachment base for the lens barrel, the base block having a frame-like shape in plan view and surrounding the lens barrel, wherein the first actuator and the second actuator each comprises a moving coil unit including a magnet and a coil, either one of the magnet and the coil of the moving coil unit is attached to a mounting portion formed on the side wall of the lens barrel, and the other one of the coil and the magnet of the moving coil unit is attached to an inner wall of the base block.

12. The shake correction mechanism according to claim 1, further comprising an image sensor integrally loaded in the lens barrel.

13. The shake correction mechanism according to claim 1, further comprising a lens barrel holding member that holds the lens barrel thereon, wherein the lens barrel holding member is elastically supported by the elastic support member.

14. An image sensing apparatus comprising:

a main body of the image sensing apparatus;

an image sensing section including a lens barrel;

a swing angle detector that detects a swing angle of the lens barrel relative to the main body;

a shake correction controller that generates a shake correction control signal based on the detected swing angle; and

a shake correction mechanism controlled by the shake correction controller, wherein the shake correction mechanism comprising;

the lens barrel;

a support mechanism that oscillatingly supports the lens barrel; and

an actuator unit that applies an oscillating force to the lens barrel,

the support mechanism including an elastic support member that elastically supports the lens barrel at one point thereof,

the lens barrel being operative to tilt at least an optical axis thereof when an oscillating force is applied to the lens barrel by the actuator unit, and

the elastic support member being subjected to elastic deformation when the oscillating force is applied to the lens barrel by the actuator unit.