Exposure data printing device for a camera

Details Exposure data printing device for a camera Exposure data printing device for a camera

1975-03-20

1977-05-24

Hix, L. T.

Photocopying

Contact printing

Light boxes

354106, 355 40, G03B 1724

Patent

active

040259315

ABSTRACT:
A device for printing an image of an indicium manually selected from a series of indicia representing different exposure values in or near the corresponding exposed frame of the film associated with a camera. Responsive to an actuation of the camera shutter release member, a pulse-forming circuit produces a pulse signal in a predetermined potential form which drives a switching circuit until the time dependant potential of the pulse signal reaches a threshold level for actuating an electronic switch controlling the period of actuation of a lamp by which said selected indicium is illuminated, whereby the time of exposure of the film to the indicium printing light is maintained constant irrespective of variation of the period of actuation of the camera shutter release member.

REFERENCES:
patent: 2821124 (1958-01-01), Enright
patent: 2907985 (1959-10-01), Doersam et al.
patent: 2987976 (1961-06-01), Martin
patent: 3554102 (1971-01-01), Maronde
patent: 3739697 (1973-06-01), Miyagawa
patent: 3812508 (1974-05-01), Matsuda et al.
patent: 3889281 (1975-06-01), Taguchi et al.

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