Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-10-25
1990-12-18
Bovernick, Rodney B.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
350 67, 358206, G02B 2608, H04N 308
Patent
active
049781855
ABSTRACT:
An overfilled polygon scanning system is implemented by first determining which portions of the polygon facet can be formed with a degree of flatness within specification. Typically, the flatness goes increasingly out of specification to the facet edges, causing stray light and subsequent reduction in contrast in a subsequent exposure at a photoreceptor image plane. Once the areas of the outside specification portions are determined, these areas which constitute the oversized portion of the polygon are coated with a non-reflective material. This coating eliminates light reflected from these areas and assures that the light is reflected only along the non-coated (within specification) portion of each facet.
REFERENCES:
patent: 3944323 (1976-03-01), Starkweather
patent: 4245894 (1981-01-01), Luchtenberg
patent: 4277141 (1981-07-01), Kleiber
patent: 4357071 (1982-11-01), Mankel et al.
patent: 4519680 (1985-05-01), Grollimond
patent: 4790639 (1988-12-01), Baumgarten et al.
patent: 4884856 (1989-12-01), Takeyasu et al.
patent: 4902085 (1990-02-01), Hurakoshi et al.
Bovernick Rodney B.
Nguyen Thong
Xerox Corporation
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