Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1996-01-16
1998-04-28
Reinhart, Mark J.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
347235, B41J 247
Patent
active
057451540
ABSTRACT:
A digital image forming apparatus is constructed to accurately detect period abnormality of a horizontal sync signal. In the apparatus, a sync signal generation portion outputs the horizontal sync signal by a received light signal from a light position detector. A sync signal abnormality monitor monitors whether a detected period of the sync signal is longer than a reference period, or it is normal. When the output signal of the sync signal is judged to be longer than the reference period, an abnormality detecting signal is supplied to a continuous turning-on portion. When the continuous turning-on portion receives the abnormality detecting signal, it issues an instruction to a synchronizing turning-on portion so that video data continues to be turned on, that is, turning-on signal is continuously outputted. Since a laser beam is continuously turned on by this instruction, the light position detector can certainly receive the laser beam. Accordingly, the period of the sync signal can be accurately detected and the cause of period abnormality can be specified.
REFERENCES:
patent: 4710779 (1987-12-01), Funaki et al.
patent: 5305023 (1994-04-01), Fukushige et al.
Fuji 'Xerox Co., Ltd.
Reinhart Mark J.
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