IMAGE BLUR CORRECTION DEVICE, LENS BARREL AND IMAGING APPARATUS

• US 20090060485A1
• Filed: 08/26/2008
• Published: 03/05/2009
• Est. Priority Date: 08/28/2007
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: TAKAHASHI, Tatsuyuki
• Granted Patent: US 7,822,331 B2
• Time in Patent Office: Days
• US Class Current: 396/55
• 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: G03B 5/00 Adjustment of optical system relative to image or object surface other than for focusing

Abstract

An image blur correction device is provided. The device includes a correction lens, a first movable frame, a second movable frame, a fixed base, a driving part and a guide mechanism. The correction lens is configured to correct an image blur in a lens system. The first movable frame holds the correction lens. The second movable frame supports the first movable frame to be movable in a first direction perpendicular to an optical axis of the lens system. The fixed base supports the second movable frame to be movable in a second direction perpendicular to the optical axis of the lens system and perpendicular to the first direction. The driving part moves the first movable frame in the first direction and moves the second movable frame in the second direction. The guide mechanism has at least one guide shaft guiding both the first movable frame and the second movable frame.

Claims

1. An image blur correction device comprising:

a correction lens configured to correct an image blur in a lens system;

a first movable frame holding the correction lens;

a second movable frame supporting the first movable frame to be movable in a first direction perpendicular to an optical axis of the lens system;

a fixed base supporting the second movable frame to be movable in a second direction perpendicular to the optical axis of the lens system and perpendicular to the first direction;

a driving part moving the first movable frame in the first direction and moving the second movable frame in the second direction; and

a guide mechanism having at least one guide shaft guiding both the first movable frame and the second movable frame.

2. An image blur correction device according to claim 1, wherein

the guide mechanism includes:

a first guide shaft guiding the first movable frame in the first direction;

a second guide shaft guiding the second movable frame in the second direction;

a first shaft engaging part provided in the first movable frame; and

a third guide shaft guiding the second movable frame in the second direction and allowing the first shaft engaging part to be slidably engaged therewith in a direction perpendicular to the optical axis of the lens system.

3. An image blur correction device according to claim 2, wherein

the second movable frame includes a second shaft engaging part slidably engaged with the third guide shaft.

4. An image blur correction device according to claim 2, wherein

the first guide shaft and the second guide shaft are placed in positions rotated and displaced at about 90°

to each other around the correction lens as a center, and the third guide shaft is placed opposite the first guide shaft and the second guide shaft across the correction lens.

5. An image blur correction device according to claim 2, wherein

the third guide shaft extends in a direction at about 45°

to the first direction and the second direction.

6. An image blur correction device according to claim 1, wherein

the guide mechanism includes:

a shaft engaging part provided in the first movable frame;

a shaft support part provided in the fixed base;

a first guide shaft guiding the first movable frame in the first direction and slidably supported by the shaft support part in a direction perpendicular to the optical axis of the lens system; and

a second guide shaft guiding the second movable frame in the second direction and allowing the shaft engaging part to be slidably engaged therewith in a direction perpendicular to the optical axis of the lens system.

7. A lens barrel comprising:

a barrel case in which a lens system is stored; and

an image blur correction device including a correction lens configured to correct an optical axis of the lens system and moving the correction lens in a direction perpendicular to the optical axis of the lens system,

the image blur correction device including

a first movable frame holding the correction lens;

a second movable frame supporting the first movable frame to be movable in a first direction perpendicular to the optical axis of the lens system;

a fixed base supporting the second movable frame to be movable in a second direction perpendicular to the optical axis of the lens system and perpendicular to the first direction;

a driving part moving the first movable frame in the first direction and moving the second movable frame in the second direction; and

a guide mechanism having at least one guide shaft guiding both the first movable frame and the second movable frame.

8. An imaging apparatus correcting an image blur in a lens system, the imaging apparatus comprising:

a lens barrel including a barrel case in which the lens system is stored, and an image blur correction device including a correction lens configured to correct an image blur in the lens system; and

a device main body to which the lens barrel is attached,

the image blur correction device including

a first movable frame holding the correction lens;

a second movable frame supporting the first movable frame to be movable in a first direction perpendicular to an optical axis of the lens system;

a fixed base supporting the second movable frame to be movable in a second direction perpendicular to the optical axis of the lens system and perpendicular to the first direction;

a driving part moving the first movable frame in the first direction and moving the second movable frame in the second direction; and

a guide mechanism having at least one guide shaft guiding both the first movable frame and the second movable frame.