Apparatus for detecting the secondary distortion of optical type

Details Apparatus for detecting the secondary distortion of optical type Apparatus for detecting the secondary distortion of optical type

1989-07-13

1990-12-18

Richardson, Robert L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 50, 369107, 346 76L, G11B 700

Patent

active

049791621

ABSTRACT:
An apparatus for recording information on an optical type recording medium alternately generates a binary signal of a first frequency and a binary signal of a second frequency lower than the first frequency, applies radiation to the medium and writes the binary signals of the first frequency and the second frequency into the medium, reproduces the binary signals of the first frequency and the second frequency written into the medium and converts them to electrical signals, AC-amplifies the electrical signals, detects the difference between the amplitude of the output of the AC amplifier of a level higher than a reference level, which corresponds to the first frequency and of a level lower than the reference level, which corresponds to the first frequency and outputs a detection signal, and responds to the detection signal to control the intensity of the radiation applied to the medium for writing.

REFERENCES:
patent: 4225873 (1980-09-01), Winslow
patent: 4380015 (1983-04-01), Ito et al.
patent: 4456914 (1984-06-01), Winslow
patent: 4488277 (1984-12-01), McFarlane et al.
patent: 4561032 (1985-12-01), Matsumoto et al.
patent: 4616356 (1986-10-01), Wilkinson et al.

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