Light amount correction method and apparatus for image output sy

Details Light amount correction method and apparatus for image output sy Light amount correction method and apparatus for image output sy

1985-08-21

1987-12-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250226, G01J 132

Patent

active

047162856

ABSTRACT:
A light amount correction apparatus for an image recording system in which a photographic material is exposed with light from semiconductor light sources of three colors to record images includes a driving circuit which controls the semiconductor light sources electrically with image signals so as to emit light. A monitor circuit is provided to sequentially measure the amount of light emitted from the semiconductor light sources with a photosensor and respectively outputs voltage signals corresponding thereto. Setting circuits are also provided for respectively setting reference signals for the three colors and a correction circuit is provided for adding deviations to the image signals, the deviations being obtained by respectively comparing voltage signals from the monitor circuit with the reference signals. A filter is disposed between the semiconductor light sources and the photosensor for equalizing a spectral sensitive characteristic of the photosensor with a spectral sensitive characteristic of the photographic material such that each exposure amount of light from the semiconductor light sources pass through the filter so as to always expose the photographic material with light having a constant amount and temperature.

REFERENCES:
patent: 4048493 (1977-09-01), Lee
patent: 4117375 (1978-09-01), Bachur et al.
patent: 4281245 (1981-07-01), Brogardh et al.
patent: 4375067 (1983-02-01), Kitamura
patent: 4588883 (1986-05-01), Abbas

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