Multiple laser beam differential intensity and start of scan sen

Details Multiple laser beam differential intensity and start of scan sen Multiple laser beam differential intensity and start of scan sen

1997-01-21

1998-05-12

Allen, Stephone B.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250236, 358494, H01J 314

Patent

active

057509867

ABSTRACT:
A technique for achieving both start-of-scan detection and dynamic beam intensity regulation in a multiple laser beam raster output scanner using a single photodetector. The raster output scanner includes a source or sources of a plurality of laser beams, a rotating polygon having at least one reflecting facet for sweeping the laser beams to form a scan line path, and a photodetector for receiving illumination from the multiple laser beams and for converting those beams into beam-dependent electrical currents. The raster output scanner further includes a scan detection circuit for producing a start-of-scan signal from the beam dependent current, and a beam intensity circuit for producing an electrical output signal which depends upon the difference in beam intensity of at least two of the laser beams. Beneficially, the raster output scanner also includes an optical fiber that collects a portion of the light flux in the sweeping laser beams which directs the light flux onto the photodetector.

REFERENCES:
patent: 4342050 (1982-07-01), Traino
patent: 5347124 (1994-09-01), Narukawa et al.
patent: 5438354 (1995-08-01), Genovese
patent: 5508513 (1996-04-01), Genovese
patent: 5530242 (1996-06-01), Genovese

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