Optical scanning device using plural sources of differing wavele

Details Optical scanning device using plural sources of differing wavele Optical scanning device using plural sources of differing wavele

1989-05-25

1990-07-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

358494, H01J 314

Patent

active

049403109

ABSTRACT:
An optical scanning device having a first optical beam source for exciting a first optical beam to be modulated based on an image signal, a beam scanning device having a reflecting face for scanning the first optical beam on a photosensitive face, a second optical beam source for exciting a second optical beam for generating a modulation start signal for the first optical beam and a light receiving element for receiving the second optical beam having been reflected by the beam scanning device. The second optical beam source is arranged so as to prevent its reflected optical beam when scanned by the beam scanning device from being directed toward the photosensitive face. Having detected the second optical beam, the light receiving element generates a signal for starting the modulation of the first optical beam.

REFERENCES:
patent: 3970845 (1976-07-01), Hollis et al.
patent: 4178064 (1979-12-01), Mrdjen
patent: 4205350 (1980-05-01), Gunning
patent: 4239011 (1982-05-01), Mori et al.
patent: 4616132 (1986-10-01), Kessler
patent: 4694164 (1987-09-01), Noguchi

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