Image recording apparatus with improved SOS detection

Details Image recording apparatus with improved SOS detection Image recording apparatus with improved SOS detection

1989-03-14

1989-12-19

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358206, 358443, H04N 140

Patent

active

048886475

ABSTRACT:
An image recording apparatus comprises a laser light source for generating a primary beam for scanning and a secondary beam for monitoring the light amount thereof which has a photodiode for detecting the light amount of the secondary beam. The output signal of the photodiode obtained when only the secondary beam is incident on the photodiode is distinguished from the output signal of the photodiode obtained when the secondary beam and the primary beam having been reflected from a deflecting surface are incident at the same time on the photodiode in order to output a start of scan signal for every one scan line at a moment when the primary beam and the secondary beam are incident at the same time on the photodiode.

REFERENCES:
patent: 4222643 (1980-09-01), Kitamura et al.
patent: 4268867 (1981-05-01), Traino
patent: 4320420 (1982-03-01), Rider
patent: 4400740 (1983-08-01), Traino et al.
patent: 4692877 (1987-09-01), Byerly et al.
patent: 4728989 (1988-03-01), Ohmori

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