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US 6,307,678 B2Granted
Image shake correction device for optical apparatus and optical apparatus having image shake correction device
AssigneeMinolta Co., Ltd.
InventorsAkira Kosaka, Junichi Tanii, Yoshihiro Hara, Yoshiharu Tanaka, Shoichi Minato
Life of this patent
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Abstract
An image shake correction device for correcting image shake on the focal plane of an optical apparatus due to vibration of the optical apparatus such as a camera. A correction optical element is provided in the optical path of the principal optical system, the correction optical element is driven correspondingly to the detected image shake magnitude, and the image shake on the focal plane of an optical apparatus is corrected. A driving mechanism which utilizes shape memory alloy is used for driving a correction lens for correcting image shake.
Claims34
An image shake correction device of an optical apparatus comprising:
- an optical element in an optical path of a principal optical system, including a pair of flat plates being made of transparent material corresponding to an incident surface and an outgoing surface and a transparent fluid filler filled between said pair of flat plates and a sealer to seal said filler between said pair of flat plates;
- a driving mechanism having at least one actuator which utilizes a shape memory alloy member to change an angle of at least one of said pair of flat plates with respect to an optical axis of the principal optical system of the optical apparatus and supporting said optical element, and
- said actuator maintaining a shape of said shape memory alloy member in a standby state to allow deformation both to a direction to restore the memorized original shape and to a counter direction to deform by an applied force when in a condition where the image shake is not corrected, and a temperature of said shape memory alloy member being controlled to a calculated temperature based on a detected shake magnitude of the optical apparatus for changing the shape to the memorized shape corresponding to the controlled temperature from said shape of said standby state.
An image shake correction device of an optical apparatus comprising:
- a correction optical system in an optical path of a principal optical system;
- a holder movable in a plane approximately perpendicular to an optical axis of the principal optical system for holding said correction optical system;
- a first driving mechanism having an actuator which utilizes a shape memory alloy member to move said holder and fiuctions to move said holder in the plane approximately perpendicular to the optical axis of the principal optical system in a first direction and supporting said holder, and
- said actuator maintaining a shape of said shape memory alloy member in a standby state to allow deformation both to a direction to restore the memorized original shape and to a counter direction to deform by an applied force when in a condition where the image shake is not corrected, and a temperature of said shape memory alloy member being controlled to a calculated temperature based on a detected shake magnitude of the optical apparatus for changing the shape to the memorized shape corresponding to the controlled temperature from said shape of said standby state.
1 more element
An image shake correction device of an optical apparatus comprising:
- a correction optical system in an optical path of a principal optical system;
- a holder for supporting said correction optical system;
- a first driving mechanism having a first actuator which utilizes a shape memory alloy member to move said holder and incline said holder around a first axis in a plane approximately perpendicular to an optical axis of the principal optical system and supporting said holder;
- said first actuator maintaining a shape of said shape memory alloy member in a standby state to allow deformation both to a direction to restore the memorized original shape and to a counter direction to deform by an applied force when in a condition where the image shake is not corrected, and a temperature of said shape memory alloy member being controlled to a calculated temperature based on a detected shake magnitude of the optical apparatus for changing the shape to the memorized shape corresponding to the controlled temperature from said shape of said standby state;
- a second driving mechanism having a second actuator which utilizes said shape memory alloy member to move said holder and incline said holder around a second axis, which is different from the first axis, in a plane approximately perpendicular to the optical axis of the principal optical system and supporting said holder;
- and
- said second actuator maintaining a shape of said shape memory alloy member in a standby state to allow deformation both to a direction to restore the memorized original shape and to a counter direction to deform by an applied force when in a condition where the image shake is not corrected, and a temperature of said shape memory alloy member being controlled to a calculated temperature based on a detected shake magnitude of the optical apparatus for changing the shape to the memorized shape corresponding to the controlled temperature from said shape of said standby state.
4 more elements
An optical apparatus with an image shake correction device comprising:
- a first optical system for capturing an optical image from an object;
- a second optical system for correcting a shake of the optical image taken from said first optical system;
- and
- a driving mechanism having an actuator which utilizes a shape memory alloy member for driving said second optical system and supporting said second optical system;
- and
- said actuator maintaining a shape of said shape memory alloy member in a standby state to allow deformation both to a direction to restore the memorized original shape and to a counter direction to deform by an applied force when in a condition where the image shake is not corrected, and a temperature of said shape memory alloy member being controlled to a calculated temperature based on a detected shake magnitude of the optical apparatus for changing the shape to the memorized shape corresponding to the controlled temperature from said shape of said standby state.
3 more elements
A method for correcting an image shake in an optical apparatus having an image shake correction system comprising:
- (1) detecting a shake magnitude in the optical apparatus;
- (2) calculating a magnitude of displacement of the correction optical system based on the detected shake magnitude of the optical apparatus;
- (3) maintaining a shape of a shape memory alloy member which is a component of a driving mechanism for driving the correction optical system in a standby state to allow deformation both to a direction to restore the memorized original shape and to a counter direction to deform by an applied force;
- and
- (4) controlling a temperature of the shape memory alloy member for driving the correction optical system to a determined temperature based on said calculation result.
2 more elements
A method for correcting an image shake in an optical apparatus having an image shake correction system comprising:
- (1) maintaining a shape of a shape memory alloy member which is a component of a driving mechanism for driving the image shake correction optical system in a standby state to allow deformation both to a direction to restore the memorized original shape and to a counter direction to deform by an applied force;
- (2) detecting a shake magnitude in the optical apparatus;
- (3) calculating a magnitude of displacement of the image shake correction optical system based on the detected shake magnitude of the optical apparatus;
- (4) defonning said shape memory alloy member for driving the image shake correction optical system to a determined temperature based on said calculation result;
- and
- (5) controlling a temperature of said shape memory alloy member by using current value data corresponding to the image shake magnitude.
3 more elements
Dependencies are inferred from the claim text.