Printer beam position feedback sensor

Details Printer beam position feedback sensor Printer beam position feedback sensor

1982-04-26

1983-12-13

Miller, Jr, George H.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

346 76L, G01D 942, G01D 1510

Patent

active

044207603

ABSTRACT:
A beam feedback synchronization system for optical sweeping systems is disclosed. The system includes a multi-faceted rotating reflection mirror which acts on a collimated light beam such as a laser beam, to cause it to sweep periodically in parallel straight lines across a rotating photoconducting drum. A circular reflector is positioned at a critical position between the rotating reflection mirror and the rotating photoconducting drum. This circular reflector causes a portion of this light to be split off from the main beam and reflected back upon a photodetection device which is positioned in close proximity to the rotating reflection mirror. The electrical signals from the photodetection device are amplified and modified before being applied as periodic synchronizing feedback signals to the character generator from which the data information is emanating.

REFERENCES:
patent: 3835249 (1974-09-01), Dattillo et al.
patent: 4019186 (1977-04-01), Dressen et al.
patent: 4307409 (1981-12-01), Greenig et al.

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