1994-05-27
1996-08-13
Gellner, Michael L.
354261, G03B 920
Patent
active
055461492
ABSTRACT:
A focal plane shutter for a camera comprises opening and closing blade units operable to open and close a shutter opening of the camera. Each blade unit has a leading blade and trailing blades in superposed relation to the leading blade. The leading blade and the trailing blades are supported by arm members through hollow pivot pins. The hollow pivot pins supporting the leading blade of each blade unit are covered by the trailing blades. Due to the use of hollow pivot pins, the overall weight and driving force of the blade units are effectively reduced to thereby make the shutter free of operational impact without light leakage.
REFERENCES:
patent: 3580156 (1971-05-01), Loseries
patent: 4728975 (1988-03-01), Ohara et al.
patent: 4994834 (1991-02-01), Watabe et al.
Fukui Nobuyuki
Izumi Hiroyuki
Nemoto Ichiro
Takahashi Kunioki
Chapik Daniel
Gellner Michael L.
Seiko Precision Inc.
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