Optical recording device

Details Optical recording device Optical recording device

1980-12-16

1982-05-04

Hix, L. T.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

346 76L, 369116, 3581285, G01D 1514, G11B 700

Patent

active

043285066

ABSTRACT:
In an optical recording device in which the writing laser light beam is focused to a small spot on a disk which is coated with a photosensitive medium and spins at a predetermined velocity so that the data are recorded in terms of variable density or surface irregularities, the forward DC current applied to a semiconductor laser is varied depending upon the radius position of the writing laser beam spot on the disk but the AC current which is superposed on the DC current and rises or drops above or below the DC current level by a predetermined amplitude depending upon the data to be recorded is maintained constant regardless of the radius position of the writing laser beam spot, whereby the duty ratio can be maintained constant regardless of the distance from the center of the disk of a selected recording track.

REFERENCES:
patent: 4118734 (1978-10-01), Bouwhuis et al.
patent: 4142210 (1979-02-01), Otobe et al.
patent: 4190860 (1980-02-01), Somers et al.

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