Camera with dual mode exposure controlled data imprinting

Details Camera with dual mode exposure controlled data imprinting Camera with dual mode exposure controlled data imprinting

1994-01-28

2000-03-28

Metjahic, Safet

Photography

With data recording

Optical

396435, G03B 1724

Patent

active

06044231&

ABSTRACT:
A camera has a data imprinting device having an optical system focussing light from an LED array on a photographic film at first and second positions corresponding to full-size and panorama-size picture formats. In a first embodiment the optical system has two lens elements, at differing distances from the LED array, each aligned to imprint data at one of the two positions. In a second embodiment the optical system has a single lens element which moves from a first lens position to a second lens position at differing distances from the LED array. Amounts of light emitted by the LED array are modulated by a control system to produce correctly exposed imprinted data at both position. The control system compensates for differing numerical apertures of associated with the first and second positions. The control system also compensates for film speed. One embodiment of the invention modulates the amount of emitted light by adjusting a current level driving the LED array. Another embodiment modulates by pulse width modulating the illumination period of the LED array.

REFERENCES:
patent: 4074294 (1978-02-01), Fujita et al.
patent: 5245373 (1993-09-01), Ogawa et al.
patent: 5319402 (1994-06-01), Tsujimoto et al.
patent: 5349402 (1994-09-01), Soshi et al.

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