Image shake correcting device

• US 6,278,842 B1
• Filed: 01/06/2000
• Issued: 08/21/2001
• Est. Priority Date: 04/27/1994
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Yamazaki, Tatsuya, Ohkawara, Hiroto
• Primary Examiner(s): Perkey, W. B.
• Application Number:
  US09/478,502
• Time in Patent Office: 593 Days
• Field of Search: 396/52, 396/55, 348/208, 359/554, 359/557
• 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 17/00 Details of cameras or camera bodies; Accessories therefor lens hoods or caps G03B11/04
• CPC Class Codes: G03B 2213/025 Sightline detection
• CPC Class Codes: G03B 2217/005 Blur detection
• CPC Class Codes: H04N 23/635 Region indicators; Field of view indicators
• CPC Class Codes: H04N 23/673 based on contrast or high frequency components of image signals, e.g. hill climbing method
• CPC Class Codes: H04N 23/675 comprising setting of focusing regions
• CPC Class Codes: H04N 23/68 for stable pick-up of the scene, e.g. compensating for camera body vibrations
• CPC Class Codes: H04N 23/6812 based on additional sensors, e.g. acceleration sensors
• CPC Class Codes: H04N 23/6815 by distinguishing pan or tilt from motion
• CPC Class Codes: H04N 23/686 with a variable apex prism
• CPC Class Codes: H04N 23/70 Circuitry for compensating brightness variation in the scene

Abstract

An image-shake correcting device includes structure for detecting a vibration, and a device for correcting a motion of an image due to the detected vibration. Limiting circuitry is provided for limiting a frequency response of an output of the detecting structure, and switching structure is provided for switching the correcting device between a stopping state and a driving state. Control circuitry is provided for changing a frequency response characteristic of the limiting circuitry when the correcting device is switched from the stopping state to the driving state by the switching structure.

Claims

1. An image-shake correcting device comprising:

detecting means for detecting a vibration;

correcting means for correcting a motion of an image due to the vibration;

driving means for driving said correcting means;

switching means for driving or stopping said driving means;

generating means for generating a target value for said correcting means from an output signal of said detecting means; and

controlling means for controlling said driving means by using a signal generated by said generating means,

wherein said switching means is provided at a rear stage of said generating means.

2. An apparatus for driving a correction device for correcting a motion of an image due to vibration on the basis of an output signal from a vibration detecting device, comprising:

a target value signal generating device which produces a signal of a driving target value of said correction device from the output signal from said vibration detecting device; and

a switch adapted to switch off supply of the driving target value signal generated by said target value signal generating device to said correction device.

3. An apparatus according to claim 2, wherein said vibration detecting device includes an angular speed sensor adapted to sense an angular speed signal.

4. An apparatus according to claim 3, wherein said target value signal generating device produces the driving target value by integrating the angular speed signal from said angular speed sensor.

5. An apparatus according to claim 4, further comprising:

an operating device adapted to determine a difference between the driving target value signal generated from said target value signal generating device as a driving signal for said correction device and a signal of a correction position of said correction device.

6. An apparatus according to claim 5, wherein said switch further adapted to switch off an input of the driving target value signal produced by said target value signal generating device to said operating device.

7. An apparatus according to claim 3, wherein said target value signal generating device is further adapted to produce the driving target value signal by generating an angular displacement signal from said angular speed sensor.

8. An apparatus according to claim 7, further comprising an operating device adapted to determine a difference between the driving target value signal generated from said target value signal generating device as a driving signal for said correction device and a signal of a correction position of said correction device.

9. An apparatus according to claim 8, wherein said switch further adapted to switch off an input of the driving target value signal generated by said target value signal generating device to said operating device.

10. An apparatus according to claim 2, wherein said apparatus includes said vibration detection device.

11. An apparatus according to claim 2, wherein said apparatus includes said correction device.