Scanning brush and method of use

Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light

Reexamination Certificate

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Details

C347S256000, C347S239000, C359S204200, C359S197100

Reexamination Certificate

active

06897888

ABSTRACT:
A scanning system uses a multi-beam brush having a widely separated beams, a modulator that controls intensity of pixels in scan beams, an optical system that minimizes scan line bow at the expense of non-uniform scanning beam velocity, and a timing generator that generates a pixel clock signal having a variable period that compensates for the non-uniformity of pixel velocity. The wide separation of scan beams permits the modulator to turn beams on or off with a direction of brightening or darkening in the cross-section of the beams being opposite to the scanning direction. A novel arrangement of the beams in the brush permits a uniform indexing step size to uniformly expose an image region. In one embodiment, the timing generator includes: a source of pixel period values; a select circuit to select pixel period values for pixels, and a counter that loads a first value from the pixel period value selected for a pixel, counts for a period of time indicated by the first value, and asserts a signal marking an end of the period. An additional delay after the signal from the counter can be shorter than the period of a clock signal to the counter but also controlled by the pixel period value.

REFERENCES:
patent: 4692877 (1987-09-01), Byerly et al.
patent: 5631762 (1997-05-01), Kataoka
patent: 5923359 (1999-07-01), Montgomery
patent: 56-110960 (1981-09-01), None
patent: 63-217763 (1988-09-01), None
patent: 02-105110 (1990-04-01), None
patent: WO9409989 (1994-05-01), None

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