Camera

Details Camera Camera

1994-12-13

1997-02-11

Metjahic, Safet

Photography

Exposure data from film itself

396536, 396511, 396514, G03B 700, G03B 1702, G03B 1726

Patent

active

056030673

ABSTRACT:
A camera is of a type using the 120 size of roll film or the 220 size of roll film, which is so arranged that the height of a pressure plate on a back lid is changed over depending upon a type of a used film. A reflection-type photosensor is provided in the camera body, whereby a state of a lock mechanism of the back lid is detected. A second reflective plate is mounted on the pressure plate, and the second reflective plate reflects light from the photosensor when the back lid is in a lock state. A reflecting position where the light from the photosensor impinges is changed between reflective portions depending upon the height of the pressure plate. Since reflectivities of these reflective portions are different from each other, the height of the pressure plate, that is, the type of the used film can be determined by analyzing an output from the photosensor receiving the reflected light from the second reflective plate.

REFERENCES:
patent: 3601021 (1971-08-01), Easterly
patent: 4085410 (1978-04-01), Maeda et al.
patent: 5109241 (1992-04-01), Keeney

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