1976-03-29
1978-03-14
Gonzales, John
354241, 354288, G03B 1912
Patent
active
040793966
ABSTRACT:
A focal plane shutter unit for a camera has a dimension-stable framework which has a rear wall member provided with an exposure aperture and with a film guide channel defining a path of the film behind the exposure aperture and which has a front surface to which a support structure having means for receiving and holding a lens mount is fixedly secured so that a predetermined spatial relationship between the objective lens and the film plane is established with dimension-stability, though the internal and external camera housing sections are made from a dimension-unstable material such as plastic. The framework is further adapted to carry front and rear shutter curtains with respective drive means, front curtain actuating means, rear curtain actuating means, and shutter cocking means coupled to the film wind mechanism of the camera.
REFERENCES:
patent: 3289561 (1966-12-01), Maurer
patent: 3759156 (1973-09-01), Kobori
patent: 3812513 (1974-05-01), Berk et al.
Iura Yukio
Mashimo Yukio
Taguchi Tetsuya
Uchiyama Takashi
Yamamichi Masayoshi
Canon Kabushiki Kaisha
Gonzales John
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