Actuator, and lens unit and camera with the same
First Claim
1. An actuator comprising:
- a fixed member;
a movable member;
a movable member supporting means for supporting the movable member so as to permit the movable member to move to an arbitrary position in a plane in parallel with the fixed member;
at least three actuating coils attached to either one of the fixed member and the movable member;
actuating magnets attached to the remaining one of the fixed member and the movable member in positions corresponding to the actuating coils so as to apply magnetic force to the corresponding actuating coils to affect each other when current flows in the actuating coils;
a position sensing means for detecting a relative position of the movable member to the fixed member; and
a control means for producing a coil position command signal on the basis of a command signal to instruct the position where the movable member is to be moved, and for controlling the drive current to flow in each of the actuating coils in response to the coil position command signal and the position data detected by the position sensing means.
1 Assignment
0 Petitions
Accused Products
Abstract
The invention is directed to provide an actuator featuring a quick response with a simplified architecture, and a lens unit and a camera having the same.
An actuator (10) comprises a fixed member (12), a movable member (14), a movable member supporting means supporting the movable member so as to permit the movable member to move to an arbitrary position in a plane in parallel with the fixed member, at least three actuating coils (20) attached to either one of the fixed member and the movable member, actuating magnets (22) attached to the remaining one of the fixed member and the movable member in positions corresponding to the actuating coils so as to apply magnetic force to the corresponding actuating coils to affect each other when current flows in the actuating coils, a position sensing means (24) detecting a relative position of the movable member to the fixed member, and a control means (36) producing a coil position command signal on the basis of a command signal to instruct where the movable member is to be moved and controlling the drive current to flow in each of the actuating coils in response to the coil position command signal and the position data detected by the position sensing means.
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Citations
13 Claims
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1. An actuator comprising:
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a fixed member;
a movable member;
a movable member supporting means for supporting the movable member so as to permit the movable member to move to an arbitrary position in a plane in parallel with the fixed member;
at least three actuating coils attached to either one of the fixed member and the movable member;
actuating magnets attached to the remaining one of the fixed member and the movable member in positions corresponding to the actuating coils so as to apply magnetic force to the corresponding actuating coils to affect each other when current flows in the actuating coils;
a position sensing means for detecting a relative position of the movable member to the fixed member; and
a control means for producing a coil position command signal on the basis of a command signal to instruct the position where the movable member is to be moved, and for controlling the drive current to flow in each of the actuating coils in response to the coil position command signal and the position data detected by the position sensing means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An actuator comprising:
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a fixed member;
a movable member;
a movable member supporting means for supporting the movable member so as to permit the movable member to move to an arbitrary position in a plane in parallel with the fixed member; and
a drive means for translating and rotating the movable member relative to the fixed member.
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11. A lens unit comprising:
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a lens barrel;
a photographing lens housed in the lens barrel;
a fixed member secured to the lens barrel;
a movable member carrying an image stabilizing lens;
a movable member supporting means for supporting the movable member so as to permit the movable member to move to an arbitrary position in a plane in parallel with the fixed member;
at least three actuating coils attached to either one of the fixed member and the movable member;
actuating magnets attached to the remaining one of the fixed member and the movable member in positions corresponding to the actuating coils for applying magnetic force to the corresponding actuating coils to affect each other when current flows in the actuating coils;
a position sensing means for detecting a relative position of the movable member to the fixed member;
a vibration sensing means for detecting vibrations of the lens barrel;
a lens position command signal generating means for generating a lens position command signal to instruct where the image stabilizing lens is to be moved on the basis of a detection signal from the vibration sensing means; and
a control means for producing a coil position command signal related to the actuating coils on the basis of the lens position command signal from the lens position command signal generating means, and for controlling drive current to flow in the actuating coils in response to the coil position command signal and the position data detected by the position sensing means. - View Dependent Claims (13)
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12. A lens unit comprising:
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a lens barrel;
a photographing lens housed in the lens barrel;
a fixed member attached to the lens barrel;
a movable member carrying an image stabilizing lens;
a movable member supporting means for supporting the movable member so as to permit the movable member to move to an arbitrary position in a plane in parallel with the fixed member; and
a drive means for translating and rotating the movable member relative to the fixed member in the plane in parallel with the fixed member.
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Specification