Digital densitometer with controlled light emitter
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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May 20, 2003
Grant Date -
N/A
app pub date -
Apr 3, 2000
filing date -
Apr 3, 2000
priority date (Note) -
Expired
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Abstract
A densitometer with a controllable light emitter intensity operates to reduce excessive exposure of sensitive materials, such as photoconductive film. During normal printer operation, the emitter is operated in a pulsed-mode, thereby reducing emitter temperature and prolonging its useful life. Exposure of the photoconductor is also reduced, which may prolong its useful life and avoid image defects. The pulse width, frequency, and duty-cycle are chosen to give these benefits without compromising density measurement capability. The emitter drive circuitry is connected to a motion sensor so that emitter intensity is reduced to a low level when photoconductor motion is stopped. A test mode is provided during which the emitter intensity is reduced by a calibrated amount, simulating the presence of a calibrated test sample.
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