Constant track width optical disk recording

Details Constant track width optical disk recording Constant track width optical disk recording

1981-07-13

1983-12-06

Faber, Alan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

358342, 346 76L, 369116, G11B 700

Patent

active

044197500

ABSTRACT:
In accordance with the present invention, methods and apparatus are provided for making optical disk recordings having marks in radial format, representing information signals, of total fractional bandwidths greater than about 3 wherein information is recorded along constant width tracks irrespective of the radial position of recording. Specifically, constant track width recording is achieved by controlling the various recording parameters (recording spot size, tangential velocity of the optical disk, and the modulation of the recording spot) such that the optical disk receives approximately the same maximum energy density during recording of all information marks.

REFERENCES:
patent: 3894179 (1975-07-01), Jacobs
patent: 3902010 (1975-08-01), Goshima
patent: 4051329 (1977-09-01), Blondet
patent: 4118734 (1978-10-01), Bouwhuis et al.
patent: 4142210 (1979-02-01), Otobe et al.
patent: 4157568 (1979-06-01), Ohki et al.
patent: 4283785 (1981-08-01), Miyauchi
patent: 4328506 (1982-05-01), Yoshida
"Intermodulation and Moire Effects In Optical Video Recording" by M. R. DeHaan et al., Philips Res. Repts., vol. 32, pp. 436-459 (1977).

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