Variable rate scanning control

Details Variable rate scanning control Variable rate scanning control

1986-12-22

1988-05-31

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358285, H04N 117

Patent

active

047485140

ABSTRACT:
A scanner with scanning array on a movable carriage, a control for regulating the scanning speed of the carriage, a small buffer between the scanner and a workstation, a buffer capacity sensor for continuously monitoring the residual capacity of the buffer, a motion sensor for actuating the array to scan an image line each time the carriage moves a distance of one scan line, and a controller for regulating scanning speed of the carriage to substantially match the image signal output rate of the array with the image signal input rate of the workstation while maintaining a predetermined level of buffer residual capacity, the controller reducing carriage scanning speed as buffer residual capacity decreases in order to maintain the scanner operating as long as possible in the event workstation demand ceases and minimize carriage acceleration/deacceleration forces on scanner noise, vibration, and image quality.

REFERENCES:
patent: 4160279 (1979-07-01), Fuwa
patent: 4367493 (1983-01-01), Matteson
patent: 4521813 (1985-06-01), Yoshida
patent: 4591727 (1986-05-01), Gaebelein et al.
patent: 4628368 (1986-12-01), Kurata et al.

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