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US 2014/0111877 A1Published application
Lens drive device
AssigneeTDK Corporation
InventorsMasaru UNO, Kazutomo IMI
Life of this patent
Estimating the term…
Abstract
A lens drive device comprises a base, a lens holder, a piezoelectric actuator having a pair of frictional parts, and a pressing piece. The lens holder has a barrel, a projection projecting from the barrel, a support separated from the barrel, and a joint joining the projection and the support to each other. The pressing piece presses the piezoelectric actuator against the barrel so as to keep such a state that at least one of the pair of frictional parts is in contact with the barrel.
Claims10
A lens drive device comprising:
- a base;
- a lens holder arranged on the base;
- a piezoelectric actuator imparting a drive force to the lens holder;
- and
- pressing means for providing the piezoelectric actuator with a force to press the piezoelectric actuator against the lens holder;
- wherein the lens holder has:
- a barrel holding a lens;
- a projection projecting from an outer peripheral surface of the barrel in a direction intersecting an optical axis direction of the lens;
- a support supporting the barrel on the base, the support is located on the opposite side of the barrel from the projection while being separated from the barrel and disposed upright on the base;
- and
- a joint joining the projection and the support to each other;
- wherein one end side of the joint is bendable with respect to the projection so as to allow the barrel to move in the optical axis direction through the projection;
- wherein the other end side of the joint is bendable with respect to the support so as to allow the joint to move in the optical axis direction;
- wherein the piezoelectric actuator is arranged at a position opposing a region on the opposite side of the outer peripheral surface of the barrel from the projection and has a plurality of frictional parts separated from each other in the optical axis direction;
- and
- wherein the pressing means presses the piezoelectric actuator against the barrel so as to keep such a state that at least one of the plurality of frictional parts is in contact with the region.
13 more elements
A lens drive device comprising:
- a base;
- a lens holder arranged on the base;
- a piezoelectric actuator imparting a drive force to the lens holder;
- and
- pressing means for providing the piezoelectric actuator with a force to press the piezoelectric actuator against the lens holder;
- wherein the lens holder has:
- a barrel holding a lens;
- first and second projections projecting from an outer peripheral surface of the barrel in directions opposite from each other intersecting an optical axis direction of the lens;
- a support supporting the barrel on the base, the support is located on the opposite side of the barrel from the first and second projections while being separated from the barrel and disposed upright on the base;
- a first joint joining the first projection and the support to each other;
- and
- a second joint joining the second projection and the support to each other;
- wherein the first and second joints extend in the same direction from the first and second projections, respectively, while interposing the barrel therebetween;
- wherein one end side of the first joint is bendable with respect to the first projection so as to allow the barrel to move in the optical axis direction through the first projection;
- wherein one end side of the second joint is bendable with respect to the second projection so as to allow the barrel to move in the optical axis direction through the second projection;
- wherein the other end sides of the first and second joints are bendable with respect to the support so as to allow the first and second joints to move in the optical axis direction;
- wherein the piezoelectric actuator is arranged at a position opposing a region on the opposite side of the outer peripheral surface of the barrel from the first and second projections and has a plurality of frictional parts separated from each other in the optical axis direction;
- and
- wherein the pressing means presses the piezoelectric actuator against the barrel so as to keep such a state that at least one of the plurality of frictional parts is in contact with the region.
16 more elements
Dependencies are inferred from the claim text.