Single sideband scanner

Details Single sideband scanner Single sideband scanner

1979-04-05

1981-03-03

Corbin, John K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358199, G02B 2717

Patent

active

042537258

ABSTRACT:
A scanner using spatial modulation of the light profile incident upon an acousto-optic modulator in which the deflector clear aperture window is decentered from the optical axis of the system so that the light profile falls just within one edge of the deflector clear aperture window. One advantage of the decentering of the optical alignment is increased system frequency response due to transmission of only one sideband of the light profile, which in terms of a printing systems means increased resolution. Loss of laser light due to decentering of the optical alignment can be minimized by using a single sideband signal as the modulator drive signal instead of the conventional double sideband drive signal. Distortion of the light profile due to decentering of the optical alignment can be reduced by predistorting the single sideband drive signal supplied to the acousto-optic modulator.

REFERENCES:
patent: 3597536 (1971-08-01), Fawler
patent: 3631248 (1971-12-01), Johnson
patent: 3719780 (1973-03-01), Gazard et al.
patent: 3798365 (1974-03-01), Browing et al.
patent: 4000493 (1976-12-01), Spaulding et al.
patent: 4106845 (1978-08-01), Moore et al.
The Compatibility Problem in Single Sideboard Transmission, K. H. Powers, I.R.E., Aug. 1960, pp. 1431-1436.

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