Patent
1991-02-06
1994-07-26
Gellner, Michael L.
G03B 908
Patent
active
053330250
ABSTRACT:
A shutter for a camera having a film exposure opening comprising a shutter curtain movably mounted in the camera for opening and closing the exposure opening, an electromagnetic driver operatively coupled to the shutter curtain for moving the curtain between open and closed positions when the driver is energized to cause movement in one direction, and a first physical stop associated with the electromagnetic driver for physically holding the driver against further movement in the one direction when the curtain reaches one of the open or closed positions. When the electromagnetic driver is energized to cause movement in an opposite direction, a second physical stop associated with the driver and spaced from the first stop physically holds the driver against further movement in the opposite direction when the curtain reaches the other of the open or closed positions. In a focal plane shutter having first and second shutter curtains movably mounted in the camera for opening and closing the film exposure opening, there is provided first and second of the aforesaid electromagnetic drivers operatively coupled to the first and second curtains, respectively, for moving the curtains between open and closed positions when the respective drivers are energized, and each of the electromagnetic drivers is provided with the aforesaid first and second physical stops for physically holding the associated drivers against further movement when the corresponding shutter curtains reach open or closed positions in accordance with the direction of energization of respective drivers.
REFERENCES:
patent: 3577901 (1971-05-01), Gray
patent: 4024555 (1977-05-01), Inou
patent: 4338013 (1982-07-01), Shimada
patent: 4339190 (1982-07-01), Sugiura
Eastman Kodak Company
Gellner Michael L.
Han J. K.
Howley David A.
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