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US 8,573,867 B2Granted
Focal-plane shutter and optical instrument
AssigneeSeiko Precision Inc.
InventorsHiroshi Takahashi, Hideki Tanaka
Life of this patent
Estimating the term…
Abstract
A focal plane shutter includes: a board including an opening; an arm including: a rear end portion rotatably supported by the board; and a front end portion swingable in response to rotation of the rear and portion; blades coupled to the arm for opening and closing the opening; and a sensor arranged at a position opposite to the arm across the opening, and detecting a state of the blades.
Claims5
A focal plane shutter comprising:
- a board including an opening;
- an arm including:
- a rear end portion rotatably supported by the board;
- and a front end portion swingable in response to rotation of the rear end portion;
- blades coupled to the arm for opening and closing the opening;
- and
- a sensor arranged at a position opposite to the arm across the opening, and detecting a state of the blades,
- wherein the blades include first and second blades,
- a coupling point of the second blade and the arm is positioned close to the rear end portion side of the arm as compared with a coupling point of the first blade and the arm, and
- the second blade includes:
- a rear end portion coupled to the arm;
- an intermediate portion capable of closing the opening;
- and a front end portion capable of covering at least a part of the sensor and having a shape projecting toward the first blade.
10 more elements
An optical instrument comprising a focal plane shutter,
- the focal plane shutter comprising:
- a board including an opening;
- an arm including:
- a rear end portion rotatably supported by the board;
- and a front end portion swingable in response to rotation of the rear end portion;
- blades coupled to the arm for opening and closing the opening;
- and
- a sensor arranged at a position opposite to the arm across the opening, and detecting a state of the blades,
- wherein the blades include first and second blades,
- a coupling point of the second blade and the arm is positioned close to the rear end portion side of the are as compared with a coupling point of the first blade and the arm, and
- the second blade includes:
- a rear end portion coupled to the arm;
- an intermediate portion capable of closing the opening;
- and a front end portion capable of covering at least a part of the sensor and having a shape projecting toward the first blade.
11 more elements
Dependencies are inferred from the claim text.