Device for correcting pitch of scanning lines in a light beam re

Details Device for correcting pitch of scanning lines in a light beam re Device for correcting pitch of scanning lines in a light beam re

1980-07-25

1982-04-06

Griffin, Donald A.

Recorders

Thermal recording

346108, G01D 1510, G01D 942

Patent

active

043239064

ABSTRACT:
In a laser beam scanning type image recording system in which a laser beam is deflected horizontally and vertically to perform raster scanning on a recording material, a linear encoder for making a photoelectric pulse signal is provided with an optical mark in the vicinity of the end portion of the raster scanning so that the laser beam crosses the optical mark. The number of the scanning lines crossing the optical mark is counted to detect the fluctuation in amplitude of vibration of a vibrating mirror for vertically deflecting the laser beam. The gain of a driving circuit for driving the vibrating mirror is controlled according to the counted number of the scanning lines crossing the optical mark.

REFERENCES:
patent: 3448458 (1969-06-01), Carlson et al.
patent: 3999010 (1976-12-01), Oosaka et al.
patent: 4002829 (1977-01-01), Hutchison

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