Exposure method and apparatus

Details Exposure method and apparatus Exposure method and apparatus

1989-03-17

1991-01-08

Hix, L. T.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 69, G03B 2772

Patent

active

049840150

ABSTRACT:
A photosensitive material is exposed to light from a light source in an exposure corresponding to the image density of each picture element by selecting a plurality of light output modulation steps from the light output of the light source, selecting a plurality of exposure time modulation steps, computing the exposure as sets of a light output modulation step and an exposure time modulation step, selecting from them a set corresponding to the maximum exposure time modulation step as exposure parameters, and exposing the photosensitive material in accordance with the selected exposure parameters. An exposure apparatus for carrying out such optimum exposure include a light source, a light detector, an exposure parameter computing unit, and a driver for the light source.

REFERENCES:
patent: 4551011 (1985-11-01), Yuasa et al.

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