Recorders – Printing – dotting – or punching marker – Ink transfer support or moving means
Patent
1990-04-05
1991-10-22
Reinhart, Mark J.
Recorders
Printing, dotting, or punching marker
Ink transfer support or moving means
358296, G01D 1516, H04N 121
Patent
active
050599879
ABSTRACT:
A synchronizing signal generating system for a laser scanner comprises a source for emitting a first laser beam for scanning and a second laser beam for synchronization of scans by the first laser beam, a deflector for causing a scan of a medium by the first laser beam and a scan of a grating by the second laser beam, a converging optical system for converging the second laser beam transmitted through the grating, a light receiving system for receiving the second laser beam converged by the converging optical system and for generating a reference pulse signal, a circuit for controlling the source responsive to the reference pulse signal so as to synchronize a scan timing of the first laser beam and comprising a PLL circuit for generating a synchronizing signal which has a frequency N times a frequency of the reference pulse signal in response to the reference pulse signal and a control circuit for controlling a value of N depending on the recording density, and a driving circuit for driving the source of synchronism with the synchronizing signal depending on input information data.
REFERENCES:
patent: 2389403 (1945-11-01), Arnold
patent: 4837588 (1989-06-01), Imakawa et al.
patent: 4962431 (1990-10-01), Imakawa et al.
Imakawa Susumu
Takeyama Yoshinobu
Reinhart Mark J.
Ricoh & Company, Ltd.
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