Beam intensity measurement system for raster scanners

Details Beam intensity measurement system for raster scanners Beam intensity measurement system for raster scanners

1980-09-29

1982-07-27

Britton, Howard

Facsimile and static presentation processing

Facsimile

Recording apparatus

235455, 358282, 358300, H04N 124, H06N 130

Patent

active

043420508

ABSTRACT:
A raster scanner has a laser as a source of a scan beam, an optical system including a rotating polygon for scanning the laser beam across the object to be scanned, and a detector pair for identifying the start-of-scan (SOS) and end-of-scan (EOS) positions of the beam scanning path. One or both detectors are modified to incorporate a peak responding circuit which produces a signal whose voltage level represents the maximum light intensity of the scan beam as the scan beam scans across the detector or detectors. The peak responding circuit includes an output tap permitting the peak signal to be read by a suitable voltage reading meter.

REFERENCES:
patent: 3149202 (1964-09-01), Schade
patent: 3379826 (1968-04-01), Gray
patent: 3760162 (1973-09-01), Holter
patent: 4174528 (1979-11-01), White

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