Scanner with a linearized VCO pixel clock

Details Scanner with a linearized VCO pixel clock Scanner with a linearized VCO pixel clock

1990-06-18

1992-11-17

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358480, 358481, H04N 116

Patent

active

051648431

ABSTRACT:
A scanner system includes a light source for producing a light beam and scanning components for directing the light beam to a spot on a surface to be scanned that is located at a predetermined location relative to the scanning means, moving the spot across the surface along a scan line of predetermined length in a series of scan cycles. The system includes a pixel clock that produces a train of clock pulses during each of the scan cycles using a VCO circuit for producing the train of clock pulses and a control circuit for varying the timing of the clock pulses. The control circuit includes an waveshaping circuit for causing the control signal to have a waveform such that the timing of the clock pulses varies according to the position of the spot along the scan line in order to compensate for scanner non-linearity in a manner reducing pixel position distortion. One embodiment includes a digital to analog converter circuit, an absolute value circuit, and a multiple-slope amplifier circuit that shape the control signal waveform to a straight line fit of a desired curve, and the pixel clock circuitry is configured to produce exposure control pulses that reduce pixel exposure distortion.

REFERENCES:
patent: 4342050 (1982-07-01), Traino
patent: 4400740 (1983-07-01), Traino et al.
patent: 4694156 (1987-09-01), Swanberg
patent: 4706251 (1988-07-01), Shimda et al.
patent: 4729617 (1988-03-01), Shimda et al.
patent: 4849652 (1989-07-01), Hulshof
patent: 4920430 (1990-04-01), Isono et al.
patent: 4977334 (1990-12-01), Handler

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