Optical disk with narrow guide tracks

Details Optical disk with narrow guide tracks Optical disk with narrow guide tracks

1983-04-29

1985-05-14

Faber, Alan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369279, 369 44, G11B 700

Patent

active

045176680

ABSTRACT:
In an optical disk having an optical recording layer which is capable of having information thereon using a laser beam with information superposed by modulation there is formed a spiral protruding or recessed track having a width equal to about half or less of the wavelength of a laser beam to be used, this track being utilized as the guiding track of the laser beam. A method for manufacturing such an optical disk is also disclosed according to which a recessed track for tracking is formed by plastic deformation of the upper surface of an original disk with a hard processing stylus such as a diamond stylus. The original disk thus produced is utilized for forming an optical recording disk having a protruding or recessed guiding track.

REFERENCES:
patent: 3373997 (1968-03-01), Berndt
patent: 3430966 (1969-03-01), Gregg
patent: 3842194 (1974-10-01), Clemers
patent: 3855426 (1974-12-01), Bouwhuis
patent: 3968326 (1976-07-01), Nosker
patent: 4005259 (1977-01-01), Kaneko
patent: 4209793 (1980-06-01), Ueno
patent: 4209804 (1980-06-01), Dil
patent: 4295162 (1981-10-01), Carlsen
patent: 4310919 (1982-01-01), Slaten
K. Bulthius et al., Ten Billion Bits on a Disk, IEEE Spectrum, Aug. 1979, pp. 26-33.
"Optical Servo Information on Magnetic Recording Disks" by Schneider IBM Tech. Disc. Bull., vol. 16, No. 14, Sep. 1973.

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