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US 6,637,955 B2Granted
Shutter device
AssigneeCanon Kabushiki Kaisha
InventorYasuhiro Toyoda
Life of this patent
Estimating the term…
Abstract
A shutter device includes a shutter base plate having a shutter aperture, a plurality of shutter blades, and an arm member arranged to swing on a predetermined shaft provided on the shutter base plate. The arm member is connected to each of the plurality of shutter blades to cause the shutter blades to travel over the shutter aperture when the arm member swings on the shaft. With a distance to the shaft from a connection part located farthest from the shaft among connection parts where the shutter blades are connected to the arm member assumed to be D, the dimension (length) of the shutter aperture in the direction of travel of the shutter blades assumed to be A, and the maximum angle of swing of the arm member assumed to be θ, at least one of the following conditions is satisfied: 0.78 A≦D≦0.90 A, and 80°≦θ≦94°.
Claims22
A shutter device, comprising:
- a shutter base plate having a shutter aperture;
- a plurality of shutter blades;
- and
- an arm member arranged to swing on a predetermined shaft provided on said shutter base plate, said arm member being connected to each of said plurality of shutter blades so as to cause the shutter blades to travel over the shutter aperture when said arm member swings on said predetermined shaft,
- wherein, when a distance to said predetermined shaft from a connection part located farthest from said predetermined shaft among connection parts where the shutter blades are connected to said arm member is D, and the length of the shutter aperture in the direction of travel of the shutter blades is A, the following condition is satisfied:
- 0.78 A≦D≦0.90 A.
3 more elements
A shutter device, comprising:
- a shutter base plate having a shutter aperture;
- a plurality of shutter blades;
- and
- an arm member arranged to swing on a predetermined shaft which is provided as a center of swing on said shutter base plate, said arm member being connected to each of said plurality of shutter blades so as to cause the shutter blades to travel over the shutter aperture when said arm member swings on said predetermined shaft,
- wherein, when a maximum angle of swing of said arm member is θ, a distance to said predetermined shaft from a connection part located farthest from said predetermined shaft among connection parts where the shutter blades are connected to said arm member is D, and the length of the shutter aperture in the direction of travel of the shutter blades is A, the following conditions are satisfied:
- 80°≦θ≦94°;
- and
- 0.78 A≦D≦0.90 A.
5 more elements
A shutter device, comprising:
- a shutter base plate having a shutter aperture;
- a plurality of shutter blades;
- a first arm member arranged to swing on a predetermined shaft provided on said shutter base plate as a center of swing, said first arm member being connected to each of said plurality of shutter blades;
- and
- a second arm member arranged to swing on a second shaft, different from the predetermined shaft, said second arm member being connected to each of said plurality of shutter blades, said plurality of shutter blades being arranged to travel over the shutter aperture when said first arm member and said second arm member swing respectively on said predetermined shaft and said second shaft,
- wherein, when a distance between said predetermined shaft and said second shaft is E, and the length of the shutter aperture in the direction of travel of the shutter blades is A, the following condition is satisfied:
- 0.33 A≦E≦0.39 A.
4 more elements
A shutter device, comprising:
- a shutter base plate having a shutter aperture;
- first, second, third and fourth shutter blades;
- and
- a first arm member arranged to swing on a predetermined shaft provided on said shutter base plate, said first arm member being connected, in the order from the farthest to the nearest to the center of swing of said first arm member, to said first, second, third and fourth shutter blades, one by one, and arranged so as to cause said first, second, third and fourth shutter blades to travel over the shutter aperture when said first arm member swings on said predetermined shaft,
- wherein, among distances of connection parts where said first, second, third and fourth shutter blades respectively are connected to said first arm member, with respect to a line segment connecting said predetermined shaft to the connection part where said first shutter blade is connected to said first arm member, the distance from the connection part connecting said third shutter blade to said first arm member is the longest.
2 more elements
A shutter device, comprising:
- a shutter base plate having a shutter aperture;
- a plurality of shutter blades;
- a first arm member arranged to swing on a predetermined shaft provided on said shutter base plate as a center of swing, said first arm member being connected to each of said plurality of shutter blades;
- a second arm member arranged to swing on a second shaft, different from the predetermined shaft, said second arm member being connected to each of said plurality of shutter blades, and
- a driving member arranged to drive said first arm member to swing on the center of swing, wherein a shutter blade which determines the shape of the shutter aperture from among said plurality of shutter blades has a blade end thereof, on the side where said predetermined shaft and said second shaft are located, arranged to be located within a driving area of said driving member when all of said plurality of shutter blades are in an overlapped state and to part from the driving area when said plurality of shutter blades are in a state of being driven by said driving member.
2 more elements
An image display apparatus comprising:
- a display screen;
- and
- a projection system including a shutter device, the shutter device comprising:
- a shutter base plate having a shutter aperture;
- a plurality of shutter blades;
- and
- an arm member arranged to swing on a predetermined shaft provided on said shutter base plate, said arm member being connected to each of said plurality of shutter blades so as to cause the shutter blades to travel over the shutter aperture when said arm member swings on said predetermined shaft,
- wherein, when a distance to said predetermined shaft from a connection part located farthest from said predetermined shaft among connection parts where the shutter blades are connected to said arm member is D, and the length of the shutter aperture in the direction of travel of the shutter blades is A, the following condition is satisfied:
- 0.78 A≦D≦ 0.90 A.
6 more elements
A shutter device, comprising:
- a shutter base plate having a shutter aperture;
- a plurality of shutter blades;
- and
- an arm member arranged to swing on a predetermined shaft provided on said shutter base plate, said arm member being connected to each of said plurality of shutter blades so as to cause the shutter blades to travel over the shutter aperture when said arm member swings on said predetermined shaft,
- wherein, when a distance to said predetermined shaft from a connection part located farthest from said predetermined shaft among connection parts where the shutter blades are connected to said arm member is D, and the length of the shutter aperture in the direction of travel of the shutter blades is A, the following condition is satisfied:
- D ≦ 0.90 A.
3 more elements
Dependencies are inferred from the claim text.