Synchronizing signal generating system for laser scanner

Details Synchronizing signal generating system for laser scanner Synchronizing signal generating system for laser scanner

1988-05-04

1989-06-06

Goldberg, E. A.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

250235, 250237G, 358293, 358296, G01D 942, H01J 314, H01J 516

Patent

active

048375888

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 polygonal mirror for causing the first laser beam to scan a medium and for causing the second laser beam to scan a grating which has bright portions and dark portions alternately arranged along a scanning direction of 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 converting optical system and for generating a synchronizing signal, and a circuit for controlling the source responsive to the synchronizing signal so as to synchronize a scan timing of the first laser beam. The converging optical system comprises a plurality of lenses or concave mirrors provided for a length corresponding to a scan length of the second laser beam on the grating.

REFERENCES:
patent: 3389403 (1968-06-01), Cottingham et al.
patent: 4065212 (1977-12-01), Belleson
patent: 4212018 (1980-07-01), Ohnishi et al.
patent: 4691241 (1987-09-01), Tomohisa

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