Patent
1978-03-31
1979-12-11
Hix, L. T.
354173, 354214, 354234, 354258, 354267, 354 60R, G03B 1912, G03B 118, G03B 908
Patent
active
041780868
ABSTRACT:
In the camera disclosed, an electromagnetic actuator is responsive to a timing pulse of short duration from an exposure control circuit for controlling the closing movement of a shutter. A permanent magnet may accidently be left latched and hold the rear curtain in cocked position after the timing pulse because of possible damage to an electromagnetic control circuit as a result of a battery short circuit. This may cause the film to fog during subsequent winding or rewinding. To prevent this, an indicator produces a visible indication either in the field of view of the camera finder or, in the case of remote shutter operation, outside the camera housing, that the rear curtain must be manually unlatched.
REFERENCES:
patent: 3774514 (1973-11-01), Okamoto et al.
patent: 3875580 (1975-04-01), Watanabe et al.
patent: 3930263 (1975-12-01), Urano
patent: 3947858 (1976-03-01), Ishida
patent: 3950770 (1976-04-01), Imura
patent: 3981022 (1976-09-01), Iwashita et al.
patent: 4017875 (1977-04-01), Yamamichi
patent: 4024553 (1977-05-01), Maitani et al.
patent: 4034390 (1977-07-01), Urano et al.
patent: 4089483 (1978-05-01), Hokkanji et al.
Aizawa Hiroshi
Date Nobuaki
Shimizu Masami
Takishima Yoshiyuki
Uchidoi Masanori
Canon Kabushiki Kaisha
Hix L. T,.
Perkey William B.
LandOfFree
Camera with a device for protecting film against fogging does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Camera with a device for protecting film against fogging, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Camera with a device for protecting film against fogging will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-308214