Correcting optical device and image pickup apparatus

Patent metadata

Field	Value
Publication number	US-9348150-B2
Application number	US-201213556857-A
Country	US
Kind code	B2
Filing date	Jul 24, 2012
Priority date	Jul 28, 2011
Publication date	May 24, 2016
Grant date	May 24, 2016

Abstract

A correcting optical device according to an aspect of the present invention in which, when image shake is not corrected, a restricting member is caused to engage an engaging portion, to restrict translational movement of a movable member, and in which, when the image shake is corrected, the restricting member is caused to disengage the engaging portion, to cause the movable member to be in a state capable of the translational movement, the restricting member being provided at the rotary member, the engaging portion being provided at the movable member. A driving unit drives the movable member in a direction in which the movable member moves translationally with respect to a fixed member in a plane perpendicular to an optical axis of a correcting lens, so that the correcting lens corrects the image shake, and drives the rotary member in a direction in which the rotary member rotates around the optical axis.

First claim

What is claimed is:

1. A correcting optical device comprising:
a fixed member configured to rotatably support a rotary member in a first plane that is perpendicular to an optical axis of a correcting lens;
a movable member where the correcting lens is supported so as to be movable with respect to the fixed member in the plane in a second plane parallel to the first plane; and
a driving unit that is disposed between the movable member and the rotary member and between the movable member and the fixed member,
wherein the driving unit drives the movable member with respect to the fixed member in a direction in the second plane, and
wherein the driving unit drives the rotary member to rotate around the optical axis of the correcting lens,
so that the driving unit causes a restricting member to engage an engaging portion to restrict the translational movement of the movable member, and
so that the driving unit causes the restricting member to disengage the engaging portion, to cause the movable member to be in a state capable of the translational movement, the restricting member being provided at the rotary member, and the engaging portion being provided at the movable member.

2. The correcting optical device according to claim 1 , wherein the driving unit includes a motor including a drive coil and a permanent magnet, the motor converting electrical energy into mechanical energy by making use of magnetic flux that is generated by the permanent magnet, and wherein the drive coil is provided at the rotary member and the permanent magnet is provided at the movable member, or the drive coil is provided at the movable member and the permanent magnet is provided at the drive coil.

3. The correcting optical device according to claim 1 , wherein the driving unit includes a vibration wave motor that, by applying a drive signal to an electrical-mechanical energy conversion element, excites ellipsoidal movement in a vibrator, to generate driving force by friction at a contact portion with the vibrator, the electrical-mechanical energy conversion element being provided at the vibrator, the ellipsoidal motion generated by two bending modes, a first bending mode and a second bending mode, in which nodal lines cross each other.

4. An image pickup apparatus comprising:
the correcting optical device according to claim 1 ; and
an image pickup element provided at a position upon which light that has passed through the correcting lens of the correcting optical device is incident.

5. The image pick up apparatus according to claim 1 , wherein:
in an image-shake-correction function off state, the driving unit causes the restricting member to engage the engaging portion,
in an image-shake-correction function on state, the driving unit causes the restricting member to disengage the engaging portion, and
the driving unit is configured to move an image pickup element in the image- shake-correction function on state.

6. The correcting optical device according to claim 1 , further comprising a member configured to prevent the movable member from rotating with respect to the fixed member.

7. The correcting optical device according to claim 6 , wherein the member comprises:
a body;
a first bearing configured to prevent the movable member from rotating with respect to the body; and
a second bearing configured to prevent the body from rotating with respect to the fixed member.

8. The correcting optical device according to claim 7 ,
wherein the first hole is formed in the movable member;
wherein a second hole is formed in the fixed member, and
wherein the first bearing and the second bearing are inserted in the first hole and the second hole, respectively.

9. An image pick up apparatus comprising:
a fixed member that rotatably supports a rotary member in a first plane that is perpendicular to an optical axis of a lens;
a movable member that is supported so as to be movable with respect to the fixed member in a second plane parallel to the first plane; and
a driving unit that is disposed between the movable member and the rotary member,
wherein the driving unit drives the movable member in a direction in which the movable member moves with respect to the fixed member in the second plane in an image-shake-correction function on state, and
wherein the driving unit drives the rotary member in a direction in which the rotary member rotates around the optical axis,
so that the driving unit causes a restricting member to engage an engaging portion to restrict the translational movement of the movable member, and
so that the driving unit causes the restricting member to disengage the engaging portion to cause the movable member to be in a state capable of the translational movement, the restricting member being provided at the rotary member, and the engaging portion being provided at the movable member.

10. The image pickup apparatus according to claim 9 , wherein the driving unit includes a motor including a drive coil and a permanent magnet, the motor converting electrical energy into mechanical energy by making use of magnetic flux that is generated by the permanent magnet, and wherein the drive coil is provided at the rotary member and the permanent magnet is provided at the movable member, or the drive coil is provided at the movable member and the permanent magnet is provided at the drive coil.

11. The image pickup according to claim 9 , wherein the driving unit includes a vibration wave motor that, by applying a drive signal to an electrical-mechanical energy conversion element, excites ellipsoidal movement in a vibrator, to generate driving force by friction at a contact portion with the vibrator, the electrical-mechanical energy conversion element being provided at the vibrator, the ellipsoidal motion generated by two bending modes, a first bending mode and a second bending mode cross each other.

12. An image pickup apparatus comprising:
the correcting optical device according to claim 9 ; and
a lens through which light passes, the light being incident on the image pickup element of the correcting optical device.

13. The image pick up apparatus according to claim 9 , wherein:
in an image-shake-correction function off state, the driving unit causes the restricting member to engage the engaging portion,
in an image-shake-correction function on state, the driving unit causes the restricting member to disengage the engaging portion, and
the driving unit is configured to move an image pickup element in the image-shake-correction function on state.

14. The image pick up apparatus according to claim 9 , further comprising a member configured to prevent the movable member from rotating with respect to the fixed member.

15. The image pick up apparatus according to claim 14 , wherein the member comprises:
a first bearing configured to prevent the movable member from rotating with respect to the member; and
a second bearing configured to prevent the member from rotating with respect to the fixed member.

16. The image pick up apparatus according to claim 15 ,
wherein a first hole is formed in the movable member,
wherein a second hole is formed in the fixed member, and
wherein the first bearing and the second bearing are inserted in the first and second hole, respectively.

17. The device according to claim 16 , further comprising a member configured to engage the fixed member and the movable member and to be contactless with the rotary member.

18. The device according to claim 17 , wherein the member comprises:
a body;
a first bearing configured to prev

Assignees

• Shihoh Makoto
• Atsuta Akio
• Kudo Shinya
• Canon Kk

Inventors

• Shihoh Makoto
• Atsuta Akio
• Kudo Shinya

Classifications

• H04N23/54

  Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils · CPC title

• H04N23/687

  by shifting the lens or sensor position · CPC title

• H04N23/68

  for stable pick-up of the scene, e.g. compensating for camera body vibrations · CPC title

• H04N23/6812

  based on additional sensors, e.g. acceleration sensors · CPC title

• G02B27/64 Primary

  Imaging systems using optical elements for stabilisation of the lateral and angular position of the image · CPC title