Synchronized, variable speed capstan motor drive system for facs

Details Synchronized, variable speed capstan motor drive system for facs Synchronized, variable speed capstan motor drive system for facs

1979-04-30

1983-06-14

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358293, 358296, H04N 110, H04N 112

Patent

active

043886523

ABSTRACT:
A system synchronously controls the advance of a recording medium or may be employed in a facsimile recording apparatus in which a modulated optical information beam is caused to scan or be swept across the recording medium as the medium is advanced in a stepwise manner. For this purpose, digital control circuitry including a programmable read only memory responds to a galvanometer synchronization signal, indicative of the beginning of a scan line, and selectively generates stepping motor advance signals in accordance with a look-up table stored in the memory as the beam scans the recording medium. By this action, the location in each successively recorded line at which the recording medium is stepwise-advanced is aligned in the direction of movement of the recording medium with a corresponding advance location for every other line irrespective of the rate of advance of the medium. As a result, banding, which would otherwise contribute to degradation in the recorded image copy, is effectively eliminated.

REFERENCES:
patent: 3781902 (1973-12-01), Shim et al.
patent: 3886309 (1975-05-01), Mason
patent: 3922485 (1975-11-01), Starkweather et al.
patent: 3938191 (1976-02-01), Jarmy
patent: 3970781 (1976-07-01), Dalton et al.
patent: 4028732 (1977-06-01), Salter et al.
Schrieber et al.-Laser Scanner/Recorder for Image Transmission and Computer Processing-SPIE, vol. 66 (1975), Efficient Trans. of Pict. Info., pp. 182-189.

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