Scan lamp intensity control for raster input scanners

Details Scan lamp intensity control for raster input scanners Scan lamp intensity control for raster input scanners

1987-06-15

1989-02-07

Hix, L. T.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358293, 358294, H04N 5238, H04N 110

Patent

active

048035564

ABSTRACT:
Scan lamp intensity control with reflective patch scanned along with each image line, the reflectance signals obtained being later separated from the image signals and compared to a desired intensity level adjusted to the D/A current reference voltage. To maintain operation within the range of photosite offset adjustment, a scan lamp intensity setpoint is obtained at the beginning of scan.

REFERENCES:
patent: 3604841 (1971-09-01), Ettlinger et al.
patent: 4386345 (1983-05-01), Narveson et al.
patent: 4677287 (1987-06-01), Ejima
Fundamentals of Digital Copiers, Canon Inc., Oct. 1984, pp. 8-13.

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