Beam position sensor for a light beam scanner

Details Beam position sensor for a light beam scanner Beam position sensor for a light beam scanner

1989-10-16

1991-06-11

Willis, Davis L.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

358481, H01J 314

Patent

active

050234480

ABSTRACT:
A beam position sensor for a beam scanner is disclosed for use in a laser printer. The printer comprises three diode lasers each of which emits at a different wavelength. The beams from the three lasers are combined by the use of dichroic plates to form one combined beam. The combined beam is scanned onto a receiving medium by a polygon. The beam position sensor of the present invention is adapted to sense the position of the polygon in order to provide a synchronizing signal which will insure that each raster line in the printer is started at the proper position. The beam position sensor includes a diode laser and optics for projecting a beam from the laser onto the polygon. The beam is reflected back from the polygon into a photodetector which effects the start of a new raster line at the appropriate time.

REFERENCES:
patent: 3802779 (1974-04-01), Fletcher et al.
patent: 4243294 (1981-01-01), Noguchi
patent: 4600837 (1986-07-01), Distefano
patent: 4616132 (1986-10-01), Kessler
patent: 4782228 (1988-11-01), Westell
patent: 4806753 (1989-02-01), Noguchi
patent: 4841137 (1989-06-01), Mochizuki et al.

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