Image forming method and apparatus

Details Image forming method and apparatus Image forming method and apparatus

1988-05-02

1990-01-30

Boudreau, Leo H.

Communications: electrical

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340782, 340752, 340767, 315307, 3151693, 346107R, 346108, G09G 300

Patent

active

048976393

ABSTRACT:
Multiple light-emitting diodes in an array are supplied with a constant amount of electric current and the duration of time for which that current is supplied to the individual light-emitting diodes is changed according to the specific level of contrast to be produced. The amount of light received by a light-sensitive material can thus be controlled so that a halftone image is formed. The duration of time for which the electric current is applied to the individual light-emitting diodes consists of a predetermined constant portion and a variable portion to be added thereto. The variable portion is compensated for in accordance with the difference between the relative intensities of light emission from the individual light-emitting diodes when they are supplied with the constant electric current. As a result, the amounts of light emission from the individual light-emitting diodes are rendered sufficiently uniform to effectively compensate for the variation in the intensity of light emission from the individual diodes.

REFERENCES:
patent: 4455562 (1984-06-01), Dolan et al.
patent: 4592995 (1986-06-01), Yamakawa et al.
patent: 4755724 (1988-07-01), Wagner
patent: 4780731 (1988-10-01), Creutzmann et al.

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