Exposure control device

Details Exposure control device Exposure control device

1989-04-04

1990-11-13

Hix, L. T.

Photocopying

Projection printing and copying cameras

Step and repeat

355 69, 355 71, 355 77, G03B 2742, G03B 2772

Patent

active

049705466

ABSTRACT:
A simple illumination control device provides illuminating light with improved uniformity in intensity and without speckle fringes.
A speckle pattern, formed with a specific periodicity by the irradiation of a pulse on a first object or a second object, is moved within a predetermined range at least in one direction. The minimum number of pulses required for substantially smoothing the speckle pattern on the second object by irradiation of plural pulses during the movement of the speckle pattern over the predetermined range, is stored. Based on the minimum number of pulses, the number of pulses required for obtaining desired exposure, the amount of light of each pulse, and the number of pulses for moving the speckle pattern substantially by a cycle, are determined.

REFERENCES:
patent: 4497015 (1985-01-01), Konno et al.
patent: 4619508 (1986-10-01), Shibuya et al.
patent: 4653903 (1987-03-01), Torigoe et al.

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