Correcting optical device, image deflection correcting device and imaging device

Patent metadata

Field	Value
Publication number	US-10180557-B2
Application number	US-201414762776-A
Country	US
Kind code	B2
Filing date	Jan 8, 2014
Priority date	Jan 25, 2013
Publication date	Jan 15, 2019
Grant date	Jan 15, 2019

Abstract

A correcting optical device including: a fixing member; a rotating member; a movable member; first and second drive units; and at least first and second contact members. For the regulation of movement of the movable member, rotational driving force is produced by the first and second drive units and, the rotating member is rotated in the opposite direction of the rotational direction of the movable member after the movable member is rotated to be brought into contact with the first contact member, whereby translational movement of the movable member is regulated. For image deflection correction, rotational driving force in the opposite direction of the rotational force is produced and, the rotating member is rotated in the opposite direction of the rotational direction of the movable member after the movable member is rotated to be brought into contact with the second contact member, whereby regulation on the movable member is released.

First claim

The invention claimed is:

1. A correcting optical device comprising:
a fixing member;
a rotating member rotatably supported with respect to the fixing member in a plane perpendicular to an optical axis of the correcting optical device;
a movable member supported to be movable in parallel to the plane and configured to hold a lens;
at least first and second drive units provided between the movable member and the rotating member, and configured to produce a rotational driving force for moving the movable member; and
at least first and second contact members configured to limit a movable range of the movable member,
wherein the first and second drive units, the rotating member, the movable member, the first contact member, and the second contact member are adapted such that: for the regulation of movement of the movable member, by the rotational driving force produced by the first and second drive units, the rotating member is rotated in an opposite direction of a rotational direction of the movable member after the movable member is rotated in the rotational direction to be brought into contact with the first contact member, whereby an engaging portion formed in the rotating member and an engaging portion formed in the movable member engage each other to regulate translational movement of the movable member; and
wherein for image deflection correction, by a rotational driving force in the opposite direction of the rotational direction produced by the first and second drive units, the rotating member is rotated in the rotational direction with respect to the movable member after the movable member is rotated in the opposite direction to be brought into contact with the second contact member, whereby engagement between the rotating member and the movable member is released.

2. The correcting optical device according to claim 1 , wherein at least one of the first drive unit and the second drive unit includes a vibrator including an electrical-mechanical energy converting element provided on the rotating member and a friction member provided on the movable member, or a vibrator including the electrical-mechanical energy converting element provided on the movable member and the friction member provided on the rotating member.

3. The correcting optical device according to claim 2 , wherein when drive signals are applied to the electrical-mechanical energy converting element, elliptic movement in first and second bending modes in which nodal lines cross perpendicularly to each other is excited in the vibrator.

4. The correcting optical device according to claim 1 , wherein at least one of the first drive unit and the second drive unit includes a drive coil and a permanent magnet, the drive coil being provided on the rotating member and the permanent magnet being provided on the movable member, or the drive coil being provided on the movable member and the permanent magnet being provided on the drive coil.

5. The correcting optical device according to claim 1 , further comprising guide members provided on the movable member, the guide members being provided in a position corresponding to the first drive unit and a position corresponding to the second drive unit respectively,
wherein each of the guide members includes a slit portion extending in the direction which crosses perpendicularly a driving direction of the first drive unit or the second drive unit and crosses perpendicularly the optical axis,
wherein each of the first drive unit and the second drive unit includes a cylindrical member which extends parallel to the optical axis of the correcting optical device, and
wherein the cylindrical member is inserted in the slit portion.

6. The correcting optical device according to claim 1 , further comprising
a positioning mechanism configured to cause the rotating member to be movable when a force greater than a predetermined force is applied to the rotating member.

7. The correcting optical device according to claim 6 , wherein the positioning mechanism includes two grooves provided in the rotating member and a fitting member provided in the fixing member and, when the force greater than the predetermined force is applied to the rotating member in one rotational direction of the rotating member, the fitting member is moved from one groove of the two grooves to the other groove.

8. The correcting optical device according to claim 7 , wherein the fitting member is a ball plunger.

9. The correcting optical device according to claim 6 , wherein a force required for the rotating member to begin rotation with respect to the fixing member is greater than a force required for the movable member to begin rotation with respect to the fixing member.

10. An imaging device comprising:
the correcting optical device according to claim 6 ; and
an image pickup device provided at a position at which light transmitted by the lens provided in the correcting optical device enters.

11. The correcting optical device according to claim 6 ,
wherein at least one of the first drive unit and the second drive unit includes a vibrator including an electrical-mechanical energy converting element provided on the rotating member and a friction member provided on the movable member, or a vibrator including the electrical-mechanical energy converting element provided on the movable member and the friction member provided on the rotating member.

12. The correcting optical device according to claim 11 , wherein when drive signals are applied to the electrical-mechanical energy converting element, elliptic movement in first and second bending modes in which nodal lines cross perpendicularly to each other is excited in the vibrator.

13. The correcting optical device according to claim 1 , wherein a force required for the rotating member to begin rotation with respect to the fixing member is greater than a force required for the movable member to begin rotation with respect to the fixing member.

14. An imaging device comprising:
the correcting optical device according to claim 1 ; and
an image pickup device provided at a position at which light transmitted by the lens provided in the correcting optical device enters.

15. An image deflection correcting device comprising:
a fixing member;
a rotating member rotatably supported with respect to the fixing member in a plane parallel to a light-receiving surface of an image pickup device;
a movable member supported to be movable in parallel to the plane and configured to hold an image pickup device;
at least first and second drive units provided between the movable member and the rotating member, and configured to produce a rotational driving force for moving the movable member; and
at least first and second contact members configured to limit a movable range of the movable member,
wherein the first and second drive units, the rotating member, the movable member, the first contact member, and the second contact member are adapted such that: for the regulation of movement of the movable member, by the rotational driving force produced by the first and second drive units, the rotating member is rotated in an opposite direction of a rotational direction of the movable member after the movable member is rotated in the rotational direction to be brought into contact with the first contact member, whereby an engaging portion formed in the rotating member and an engaging portion formed in the movable member engage each other to regulate translational movement of the movable member, and
wherein for image deflection correction, by a rotational driving force in the opposite direction of the rotational direction p

Assignees

• Canon Kk

Inventors

• Shihoh Makoto

Classifications

• H04N23/55

  Optical parts specially adapted for electronic image sensors; Mounting thereof · CPC title

• G03B2205/0015

  by displacing one or more optical elements normal to the optical axis · CPC title

• G03B2205/0053

  Driving means for the movement of one or more optical element · CPC title

• H04N5/2254

  Electricity · mapped topic

• G03B5/00 Primary

  Adjustment of optical system relative to image or object surface other than for focusing · CPC title