Television – Camera – system and detail – Optics
Reexamination Certificate
2005-02-01
2005-02-01
Ho, Tuan (Department: 2615)
Television
Camera, system and detail
Optics
C396S487000
Reexamination Certificate
active
06850281
ABSTRACT:
A focal-plane shutter for digital still cameras is constructed so that a first driving member for a first blade connected to the first blade is biased by a cocking spring to rotate clockwise and a second driving member for the first blade is biased by a driving spring to rotate counterclockwise. A driving member for a second blade connected to the second blade is biased by a driving spring to rotate counterclockwise. An exposure aperture is fully opened before photographing, and when a cocking member is rotated in a clockwise direction in photographing, the first driving member is released from the holding of the cocking member and is rotated, and the exposure aperture is covered by the first blade. After that, when releasing members are separated from the iron cores of respective electromagnets, locks of locking members are released, and the driving members are rotated counterclockwise in turn. Consequently, exposure is carried out through a slit formed by the first blade and the second blade.
REFERENCES:
patent: 4737808 (1988-04-01), Toyoda
patent: 5875368 (1999-02-01), Hasuda et al.
patent: 5997188 (1999-12-01), Takahashi et al.
patent: 55149924 (1980-11-01), None
patent: 62018525 (1987-01-01), None
patent: 10096975 (1998-04-01), None
patent: 11326992 (1999-11-01), None
Aggarwal Yogesh
Ho Tuan
Nidec Copal Corporation
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