Position control device, image blur correction device, and optical apparatus

• US 7,149,419 B2
• Filed: 01/10/2005
• Issued: 12/12/2006
• Est. Priority Date: 01/30/2004
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Akada, Hiroshi
• Primary Examiner(s): PERKEY, WILLIAM B
• Application Number:
  US11/032,647
• Publication Number:
  US 20050169618A1
• Time in Patent Office: 701 Days
• Field of Search: 396/55, 702/75
• 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 2205/0007 Movement of one or more optical elements for control of motion blur imaging systems in general using optical elements for stabilisation of the position of the image G02B27/64
• 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
• CPC Class Codes: Y10T 70/7051 Using a powered device [e.g., motor]

Abstract

A position control device having first and second movable members. A first detector outputs a position signal when the first movable member is looked in a first predetermined position in a first region. A second detector outputs a first signal when the second movable member is located in either tbe first region or a second region where it is released, and a second signal when the second movable member is located in a third region. A controller determines the region in which the second movable member is located based on the detector outputs and when the determined region is the first region, an actuator moves the second movable member to a second predetermined position in the first region, and when the determined region is the second or third region, the actuator moves the second movable member to the second predetermined position.

Claims

1. A position control device, comprising:

a first movable member;

a second movable member for moving among a first region in which the first movable member is locked in a first predetermined position, a second region in which the lock state of the first movable member is released, and a third region which is as a transfer region between the first region and the second region;

a first detector for outputting a position signal corresponding to whether or not the first movable member is located in the first predetermined position;

a second detector for outputting a first signal in a state where the second movable member is located in one of the first region and the second region, and for outputting a second signal in a state where the second movable member is located in the third region; and

a controller for controlling an actuator for driving the second movable member,

wherein the controller discriminates the region in which the second movable member is located based on the position signal, the first signal and the second signal, when the discrimination result shows that the second movable member is located in the first region, controls the actuator in a first mode to move the second movable member to a second predetermined position set in the first region, and when the discrimination result shows that the second movable member is located in one of the second region and the third region, controls the actuator in a second mode to move the second movable member to the second predetermined position.

2. A position control device according to claim 1, wherein when controlling the actuator in the first mode, the controller drives the second movable member to a side of the third region until an amount of driving of the second movable member from a time point when the first signal is changed over to the second signal reaches a first predetermined amount, and drives the second movable member to a side of the first region until an amount of driving of the second movable member from a time point when the second signal is changed over to the first signal reaches a second predetermined amount corresponding to an amount of driving of the second movable member up to the second predetermined position, and

when controlling the actuator in the second mode, the controller drives the second movable member to the side of the first region until an amount of driving of the second movable member from a time point when the second signal is changed over to the first signal reaches the second predetermined amount.

3. A position control device according to claim 1, wherein the second predetermined position comprises an initialization position of the second movable member.

11. An optical apparatus comprising the position control device according to claim 1.

4. A position control device, comprising:

a first movable member;

a second movable member for moving among a first region in which the first movable member is locked in a first predetermined position, a second region in which the lock state of the first movable member is released, and a third region which is as a transfer region between the first region and the second region;

a first detector for outputting a position signal corresponding to whether or not the first movable member is located in the first predetermined position;

a second detector for outputting a first signal in a state where the second movable member is located in one of the first region and the second region, and for outputting a second signal in a state where the second movable member is located in the third region; and

a controller for controlling an actuator for driving the second movable member,

wherein the controller moves the second movable member to a second predetermined position set in the first region based on the position signal, the first signal and the second signal.

12. An optical apparatus comprising the position control device according to claim 4.

5. A position control device, comprising:

a first movable member;

a second movable member for moving among a first region in which the first movable member is locked in a first predetermined position, a second region in which the lock state of the first movable member is released, and a third region which is as a transfer region between the first region and the second region;

a detector for outputting a first signal in a state where the second movable member is located in one of the first region and the second region, and for outputting a second signal in a state where the second movable member is located in the third region; and

a controller for controlling an actuator for driving the second movable member,

wherein when the control for the actuator is interrupted, the controller determines a control content after restart of the control for the actuator based on output history of the first signal and the second signal from the detector until the interruption.

6. A position control device according to claim 5, wherein the controller discriminates whether the output history comprises first history in which the first signal is output without through the output the second signal, second history in which the first signal is output through the output of the second signal, or third history in which the second signal is output through the output of the first signal.

7. A position control device according to claim 6, wherein the controller determines a driving direction of the second movable member after restart of the control for the actuator based on a signal from an outside,

in a case where the determination results show a side of the first region, when the output history comprises one of the first history and the third history, the controller drives the second movable member to the side of the first region, and when the output history comprises the first history, the controller stops the actuator, and

in a case where the determination results show a side of the second region, when the output history comprises the first history and the third history, the controller drives the second movable member to the side of the second region, and when the output history comprises the second history, the controller stops the actuator.

13. An optical apparatus comprising the position control device according to claim 5.

8. An image blur correction device, comprising:

a lens hold member;

a lock movable member for moving among a first region in which the lens hold member is locked in a first predetermined position, a second region in which the lock state of the lens hold member is released, and a third region which is as a transfer region between the first region and the second region;

a first detector for outputting a position signal corresponding to whether or not the lens hold member is located in the first predetermined position;

a second detector for outputting a first signal in a state where the lock member is located in one of the first region and the second region, and for outputting a lock in a state where the lock member is located in the third region; and

a controller for controlling an actuator for driving the lock member,

wherein the controller discriminates the region in which the lock member is located based on the position signal, the first signal and the second signal, when the discrimination result shows that the lock member is located in the first region, controls the actuator in a first mode to move the lock member to a second predetermined position set in the first region, and when the discrimination result shows that the lock member is located in one of the second region and the third region, controls the actuator in a second mode to move the lock member to the second predetermined position.

14. An optical apparatus comprising the image blur correction device according to claim 8.

9. An image blur correction device, comprising:

a lens hold member;

a lock for moving among a first region in which the lens hold member is locked in a first predetermined position, a second region in which the lock state of the lens hold member is released, and a third region which is as a transfer region between the first region and the second region;

a first detector for outputting a position signal corresponding to whether or not the lens hold member is located in the first predetermined position;

a second detector for outputting a first signal in a state where the lock member is located in one of the first region and the second region, and for outputting a second signal in a state where the lock member is located in the third region; and

a controller for controlling an actuator for driving the lock member,

wherein the controller, moves the lock member to a second predetermined position set in the first region based on the position signal, and the first signal and the second signal.

15. An optical apparatus comprising the image blur correction device according to claim 9.

10. An image blur correction device, comprising:

a lens hold member;

a lock member for moving among a first region in which the lens hold member is locked in a first predetermined position, a second region in which the lock state of the lens hold member is released, and a third region which is as a transfer region between the first region and the second region;

a detector for outputting a first signal in a state where the lock member is located in one of the first region and the second region, and for outputting a second signal in a state where the lock member is located in the third region; and

a controller for controlling an actuator for driving the lock member,

wherein when the control for the actuator is interrupted, the controller determines a control content after restart of the control for the actuator based on output history of the first signal and the second signal from the detector until the interruption.

16. An optical apparatus comprising the image blur correction device according to claim 10.