Photography – Single lens reflex camera
Patent
1997-08-20
2000-10-03
Lee, Eddie C.
Photography
Single lens reflex camera
396395, 396396, 396401, 396403, 396411, G03B 1912, G03B 100
Patent
active
061263338
ABSTRACT:
A manual film winding device of a camera has a winding lever which is manually rotated between a winding start position and a winding end position. Also provided are a ratchet mechanism having a ratchet wheel, which is rotated in association with the winding lever's rotation, and a ratchet pawl which engages with the ratchet wheel. The ratchet wheel rotates in a winding direction when the winding lever rotates from the winding start position to the winding end position, and in a reverse direction, opposite to the winding direction, when the winding lever rotates from the winding end position to the winding start position. A film advance driving system operates in association with the ratchet wheel's rotation in the winding direction. The ratchet pawl is arranged to rotate toward a first direction in connection with the winding rotation of the ratchet wheel, and to rotate toward a second direction in connection with the reverse rotation of the ratchet wheel. A double winding preventing mechanism is provided for restraining rotation of the ratchet pawl in the first direction to prevent the ratchet wheel from rotating in the winding direction. A control device holds the ratchet pawl in a reset state, in which the rotation of the ratchet pawl toward the first direction is restrained, and clears the reset state by a signal supplied in response to a shutter release operation.
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Asahi Kogaku Kogyo Kabushiki Kaisha
Lee Eddie C.
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