Image stabilizing apparatus

• US 5,335,032 A
• Filed: 04/23/1992
• Issued: 08/02/1994
• Est. Priority Date: 04/26/1991
• Status: Expired due to Term

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Original Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Inventors: Shikaumi, Masao, Onuki, Ichiro
• Primary Examiner(s): Adams, Russell E.
• Assistant Examiner(s): TUCCILLO, NICHOLAS
• Application Number:
  US07/872,886
• Time in Patent Office: 831 Days
• Field of Search: 354/195.1, 354/202, 354/430
• US Class Current: 396/50
• CPC Class Codes: G02B 7/28 Systems for automatic generation of focusing signals
• CPC Class Codes: G03B 2205/0007 Movement of one or more optical elements for control of motion blur
• CPC Class Codes: G03B 2205/0053 Driving means for the movement of one or more optical element
• CPC Class Codes: G03B 5/00 Adjustment of optical system relative to image or object surface other than for focusing

Abstract

An image stabilizing apparatus comprises a light beam deflecting device controllable for deflecting a light beam by moving an optical member disposed in an optical path, an accelerometer for detecting an influence the optical member receives from gravity and a control device for controlling the operation of the light beam deflecting device by the use of the output of the accelerometer so as to provide image stabilization.

Claims

1. An image stabilizing apparatus comprising:

(A) image stabilizing means controllable for stabilizing an image by moving in an optical path;

(B) direction of gravity detection means for detecting a direction in which gravity acts on said image stabilizing means during operation of said image stabilizing means; and

(C) control means for changing a control of said image stabilizing means in response to an output of said direction of gravity detection means.

2. An apparatus according to claim 1, wherein said direction of gravity detecting means includes means for detecting a direction in which gravity acts on the basis of a state of said image stabilizing means during operation.

3. An apparatus according to claim 2, wherein said direction of gravity detection means includes means for detecting the direction of gravity in which gravity acts on the basis of a driving means position of said image stabilizing means.

4. An apparatus according to claim 3, wherein said direction of gravity detection means includes means for determining a direction of said image stabilizing means from a movable center position to said driving means position as a direction in which gravity acts.

5. An apparatus according to claim 3, wherein said direction of gravity detection means includes means for detecting the driving means position on the basis of an arrival of said image stabilizing means at a predetermined position.

6. An apparatus according to claim 3, wherein said direction of gravity detection means includes means for detecting the driving mean position on the basis of an arrival of said image stabilizing means at a position located near to an edge of a movable range.

7. An apparatus according to claim 4, wherein said direction of gravity detection means includes means for detecting a direction in which gravity acts on the basis of a record in which said image stabilizing means reaches the position located near to the edge of the movable range.

8. An apparatus according to claim 1, wherein said control means includes means for negating an influence said image stabilizing means receives from gravity in response to an output of said direction of gravity detection means.

9. An apparatus according to claim 6, wherein said control means includes means for applying a force on said image stabilizing means in a direction which is contrary to a direction of gravity detected by said direction of gravity detection means.

10. An apparatus according to claim 9, wherein said control means includes memory means for memorizing a magnitude of force applied in a direction which is contrary to a direction in which gravity acts.

11. An apparatus according to claim 6, wherein said control means includes means for substantially coinciding with the driving mean position of said image stabilizing means during operation of said image stabilizing means and a movable center position of said image stabilizing means.

12. An apparatus according to claim 1, further comprising image vibration detection means for detecting an image vibration, said image stabilizing means stabilizing an image in response to an output of said image vibration detection means.

13. An apparatus according to claim 1, wherein said image stabilizing means includes an optical member moving in the optical path in a plane which is substantially perpendicular to an optical axis.

14. An apparatus according to claim 1, wherein said image stabilizing means includes a variable angle prism.

15. An image stabilizing apparatus comprising:

(A) image stabilizing means controllable for stabilizing an image by moving in an optical path;

(B) direction of gravity detection means for detection a direction of gravity which acts on said image stabilizing means;

(C) memory means for memorizing a magnitude of a force applied to said image stabilizing means so as to remove an influence said image stabilizing means receives from gravity; and

(D) control means for controlling an action of said image stabilizing means in response to an output of said direction of gravity detection means and to the magnitude of force memorized by said memory means.

16. An apparatus according to claim 15, wherein said direction of gravity detection means includes means for detecting a direction in which gravity acts on the basis of a state of said image stabilizing means.

17. An apparatus according to claim 16, wherein said direction of gravity detection means includes means for detecting a direction in which gravity acts in response to a displacement of said image stabilizing means.

18. An apparatus according to claim 17, wherein said direction of gravity detection means includes means for detecting a direction of gravity in which gravity acts on the basis of a driving mean position of said image stabilizing means.

19. An apparatus according to claim 18, wherein said direction of gravity detection means includes means for determining a direction of said image stabilizing means from a movable center position to said driving mean position as a direction in which gravity acts.

20. An apparatus according to claim 17, wherein said direction of gravity detection means includes means for detecting a direction in which gravity acts in response to a displacement at a starting operation of said image stabilizing means.

21. An apparatus according to claim 20, wherein said direction of gravity detection means includes means for determining a direction from a movable center position of said image stabilizing means to a position at a starting operation of said image stabilizing means as a direction in which gravity acts.

22. An apparatus according to claim 15, wherein said control means includes means for applying a force, a magnitude of which is equal to a magnitude of the force memorized in said memory means, to a direction which is contrary to a direction of gravity detected by said direction of gravity detection means.

23. A camera comprising:

(A) image stabilizing means controllable for stabilizing an image by moving in an optical path;

(B) direction of gravity detection means for detection a direction of gravity which acts on said image stabilizing means during operation of said image stabilizing means; and

(C) control means for controlling an action of said image stabilizing means in response to an output of said direction of gravity detection means.

24. A camera comprising:

(A) image stabilizing means controllable for stabilizing an image by moving in an optical path;

(B) direction of gravity detection means for detection a direction of gravity which acts on said image stabilizing means;

(C) memory means for memorizing a magnitude of a force applied to said image stabilizing means so as to remove an influence said image stabilizing means receives from gravity; and

(D) control means for controlling an action of said image stabilizing means in response to an output of said direction of gravity detection means and to the magnitude of force memorized by said memory means.

25. A camera system comprising:

(A) image stabilizing means controllable for stabilizing an image by moving in an optical path;

(B) direction of gravity means for detecting a direction in which gravity acts on said image stabilizing means during operation; and

(C) control means for controlling an action of said image stabilizing means in response to an output of said direction of gravity detection means.

26. A camera system comprising:

(A) image stabilizing means controllable for stabilizing an image by moving in an optical path;

(B) direction of gravity detection means for detecting a direction of gravity which acts on said image stabilizing means;

(C) memory means for memorizing a magnitude of a force applied to said image stabilizing means so as to remove an influence said image stabilizing means receives from gravity; and

(D) control means for controlling an action of said image stabilizing means in response to an output of said direction of gravity detection means and to the magnitude of force memorized by said memory means.

27. An optical apparatus comprising:

(A) image stabilizing means controllable for stabilizing an image by moving in an optical path;

(B) direction of gravity detection means for detecting a direction of gravity which acts on said image stabilizing means during operation; and

(C) control means for controlling an action of said image stabilizing means in response to an output of said direction of gravity detection means.

28. An optical apparatus comprising:

(A) image stabilizing means for stabilizing an image by moving in an optical path;

(B) direction of gravity detection means for detecting a direction of gravity which acts on said image stabilizing means;

(C) memory means for memorizing a magnitude of a force applied to said image stabilizing means so as to remove an influence said image stabilizing means receives from gravity; and

(D) control means for controlling an action of said image stabilizing means in response to an output of said direction of gravity detection means and to the magnitude of force memorized by said memory means.