Recorders – Printing – dotting – or punching marker – Ink transfer support or moving means
Patent
1990-08-17
1992-03-10
Moses, R. L.
Recorders
Printing, dotting, or punching marker
Ink transfer support or moving means
G01D 942, H04N 123
Patent
active
050953150
ABSTRACT:
A multipoint synchronization optical writing apparatus which carries out an optical writing through modulation of a writing beam from a first light source in accordance with image information, the modulation of the writing beam being made in synchronism with a picture element clock signal supplied based on a synchronizing beam from a second light source. The apparatus comprises a reference signal generation circuit for generating a reference signal based on the synchronizing beam, the reference signal covering the overall width of a main scanning made with the writing beam, a phase lock loop circuit for generating the picture element clock signal having a phase in synchronism with a phase of the reference signal, a phase difference detection circuit for detecting a change in a phase difference between a write set signal and the picture element clock signal to generate a control signal having a voltage proportional to the phase difference change detected, and a reference signal processing circuit for varying a duty factor of the reference signal depending on the control signal and for supplying the reference signal having the varied duty factor to the phase lock loop circuit.
REFERENCES:
patent: 4962431 (1990-10-01), Imakawa et al.
patent: 4975650 (1990-12-01), Martin
patent: 4978976 (1990-12-01), Okino
Moses R. L.
Ricoh & Company, Ltd.
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