Electrophotography – Control of electrophotography process – Control of exposure
Patent
1996-09-09
1998-05-19
Grimley, Arthur T.
Electrophotography
Control of electrophotography process
Control of exposure
355 69, 355 77, G03G 1504
Patent
active
057549222
ABSTRACT:
This invention concerns an automatic exposure adjusting apparatus which permits infallible production of a signal corresponding exactly to the density of a given original document constantly even when the components of an optical system thereof cause any dispersion or gradual deterioration due to aging. First, the apparatus exposes a standard white subject copy 1 set on a document table 2 to the light of a preset standard amount of exposure, samples the reflected light from the copy 1 by a light detector 14, and adjusts to a proper magnitude the output value of an original document density signal emitted from a noninverting amplifier 33. Then, it exposes the standard density plate 3 to the light of an adjusted standard amount of exposure, samples the reflected light from the standard density plate 3 by the light detector 14, and readjusts to a proper magnitude the output value of an original document density signal issued from the noninverting amplifier 33. By this procedure, the apparatus is enabled to produce infallibly an original document of a proper density constantly.
REFERENCES:
patent: 4879576 (1989-11-01), Naito
Chen Sophia S.
Grimley Arthur T.
Minolta Co. , Ltd.
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