Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1981-02-17
1983-11-22
Faber, Alan
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369279, 369284, 369 44, 369 13, G11B 700
Patent
active
044173318
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:
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patent: 3842194 (1974-10-01), Clemens
patent: 4005259 (1977-01-01), Kaneko
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patent: 4295162 (1981-10-01), Carlsen
patent: 4310919 (1982-01-01), Slaten
K. Bulthuis et al., Ten Billion Bits on a Disk, IEEE Spectrum, Aug., 1979, pp. 26-33.
Miura Tadao
Mochizuki Masahiko
Takaoka Takashi
Yamashita Mitsuo
Faber Alan
Tokyo Shibaura Denki Kabushiki Kaisha
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