Modulator control for automatically overcoming intensity variati

Details Modulator control for automatically overcoming intensity variati Modulator control for automatically overcoming intensity variati

1986-05-21

1988-05-24

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358293, 358297, H04H 104

Patent

active

047469870

ABSTRACT:
A scanner with high intensity source beam, a modulator for modulating the source beam to provide a zero order beam and first order writing beam in response to an image signal input, a polygon for scanning the writing beam across a moving recording member to write images thereon, a sensor in the path of the zero order beam providing a first black beam intensity signal while scanning between pages and a second white beam intensity signal while the writing beam scans an image background area, a circuit for differencing the first and second beam intensity signals from one another to provide a composite intensity signal representing the intensity of the source beam, and a second circuit for differencing the composite beam intensity signal from an intensity setpoint signal to provide a correction signal for adjusting the rf power to the modulator to maintain a substantially constant writing beam intensity.
In a second embodiment, the correction signal is determined by a successive approximation register.

REFERENCES:
patent: 3579145 (1971-05-01), Lange
patent: 3787887 (1974-01-01), Burton
patent: 4068197 (1978-01-01), Yamazaki et al.
patent: 4367926 (1983-01-01), Hohki
patent: 4429218 (1984-01-01), Thomas
patent: 4460249 (1984-07-01), Vincent
patent: 4584612 (1986-04-01), Ono

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