Photographic printing apparatus

Details Photographic printing apparatus Photographic printing apparatus

1988-09-30

1990-01-30

Hix, L. T.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 68, 355 70, 355 38, G03B 2754, G03B 2780

Patent

active

048976865

ABSTRACT:
A photographic printing apparatus is provided with at least two illumination lamps selectively placed in a printing path for printing an image of an original on a photographic material and a lamp detector for detecting which illumination lamp is in the printing path, and then sending a signal to a controller. The controller excites the lamp detected in the printing path and designates a data channel of a memory corresponding to the detected lamp in order to read out lamp data such as a lamp slope coefficient and lamp balance therefrom and then determine an exposure time. The lamp detector effects the detection of the lamp and generates a signal when the lamp in use is broken and is replaced with a spare.

REFERENCES:
patent: 3782821 (1974-01-01), Bosman
patent: 4551011 (1985-11-01), Yuasa et al.
patent: 4576462 (1986-03-01), Lehman
patent: 4711569 (1987-12-01), Nishimori et al.

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