Scanner with non-linearity compensating pixel clock

Details Scanner with non-linearity compensating pixel clock Scanner with non-linearity compensating pixel clock

1990-05-29

1993-03-09

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Picture signal generator

331 10, 250236, 359218, H04N 104

Patent

active

051930137

ABSTRACT:
A scanner system includes a light source for producing a light beam and a scanner for directing the light beam to a spot on a surface to a be scanned and for moving the spot across the surface along a scan line of predetermined length in a series of scan cycles. A reference clock produces a train of M reference pulses during each of the scan cycles such that each of the reference pulses represents the occurrence of a respective one of M segments of the scan cycle. An oscillator produces a train of clock pulses for use in controlling the light beam at a predetermined number of desired pixel positions along the scan line while a frequency control circuit responsive to the reference pulses varies the frequency of the oscillator during the occurrence of each of the M segments of the scan cycle in order to approximate an ideal frequency variation curve the entire scan cycle.

REFERENCES:
patent: 4518998 (1985-05-01), Warner
patent: 4635000 (1987-01-01), Swanberg
patent: 4729617 (1988-03-01), Shimada et al.
Michael James Underhill, Frequency Synthesizer, Aug. 1976, Appli. No. 13997/74, G6B1447418.
D. Z. Phillips, HF Frequency Synthesizer Adaptive to various Tuning time & Frequency Increment Requirements, Jun. 1978, 91170061.

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