Fast scan spot correction in a polygon ROS using PWM

Details Fast scan spot correction in a polygon ROS using PWM Fast scan spot correction in a polygon ROS using PWM

1992-11-03

1996-02-06

Wong, Peter S.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347252, 358298, 358481, G01D 942, H04N 121, H04N 104

Patent

active

054899362

ABSTRACT:
The raster scanning system of the present invention includes a beam generator which generates a beam of radiant energy in response to a drive signal. The drive signal comprising a series of pulses. The raster scanning system further includes a polygon having an overfilled facet design in which a plurality of facets are at least partially positioned in the optical path of the beam of radiant energy regardless of the rotational position of the polygon. The polygon being adapted to scan a spot across a beam receiving surface. Additionally the raster scanning system includes spot size correcting means for maintaining a constant spot size of the scanned spot by modulating the pulse width of the drive signal provided to the beam generator.

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patent: 5184226 (1993-02-01), Cianciosi
patent: 5189441 (1993-02-01), Fukui et al.
patent: 5241330 (1993-08-01), Kawabata et al.

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