Light-source device for exposure and light-source device for ima

Details Light-source device for exposure and light-source device for ima Light-source device for exposure and light-source device for ima

1996-09-24

1998-05-05

Moses, R. L.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 32, 355 37, 355 67, 355 70, G03B 2772, G03B 2732, G03B 2752, G03B 2754

Patent

active

057482837

ABSTRACT:
Respective light-emitting elements are caused to emit light at the maximum rated outputs and densities of three colors developed by a photosensitive material are made substantially uniform. The maximum rated outputs at light-emitting central wavelengths, of the three-color light-emitting elements are respectively 2.4 mW, 0.04 mW and 1.2 mW. The ratio between the outputs is represented as R:G:B=60:1:30. On the other hand, the ratio between spectral sensitivities of the most-frequently used photosensitive material is represented as R:G:B=1:30:2. An exposure-value ratio on the photosensitive material, which is synthetically obtained from these, reaches R:G:B=2:1:2. Thus, the numerical ratio among the light-emitting elements, for making exposure values uniform becomes R:G:B=1:2:1. The numbers of the respective light-emitting elements are defined so as to reach the least numbers from the numerical ratio (i.e., one R-light-emitting element, two G-light-emitting elements and one B-light-emitting element). Further, a repetition of R-G-B-G, R-G-G-B or the like is most suitable as the sequence of arrangement of the light-emitting elements.

REFERENCES:
patent: 5132722 (1992-07-01), Fujii
patent: 5262827 (1993-11-01), Lee
patent: 5339132 (1994-08-01), Tomita et al.
patent: 5515136 (1996-05-01), Nishio et al.
patent: 5581076 (1996-12-01), Tabata

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