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US 7,611,296 B2Granted
Optical apparatus including diaphragm device
AssigneeCanon Kabushiki Kaisha
InventorsYouichi Iwasaki, Shigeru Ogino
Life of this patent
Estimating the term…
Abstract
A lens apparatus includes a lens barrel, an image-capturing optical system, and a diaphragm device disposed in an optical path of the image-capturing optical system. The diaphragm device includes a plurality of diaphragm blades and an electroactive polymer actuator configured to move the plurality of diaphragm blades from a diaphragm-open state to a diaphragm-closed state and from a diaphragm-closed state to a diaphragm-open state.
Claims2
A lens apparatus comprising:
- a lens barrel;
- an image-capturing optical system;
- and
- a diaphragm device disposed in an optical path of the image-capturing optical system,
- wherein the diaphragm device includes,
- a plurality of diaphragm blades, and
- an electroactive polymer actuator configured to move the plurality of diaphragm blades from a diaphragm-open state to a diaphragm-closed state and from a diaphragm-closed state to a diaphragm-open state,
- wherein the electroactive polymer actuator is a two-phase electroactive polymer actuator, and
- wherein when the two-phase electroactive polymer actuator is in a non-conductive state, the plurality of diaphragm blades is kept at an intermediate diaphragm position.
6 more elements
Dependencies are inferred from the claim text.