Method for controlling the rotational velocity of an information

Details Method for controlling the rotational velocity of an information Method for controlling the rotational velocity of an information

1990-04-10

1991-10-08

Sikes, William L.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369189, 369277, G11B 509, G11B 1552, G11B 2010, G11B 2722

Patent

active

050560760

ABSTRACT:
A method of controlling the rotational velocity of an information recording disk having one or more tracks in which patterns and marks are formed, the marks including at least one specific pattern having a predetermined length, which method comprises: measuring a time during which each of the patterns passes; detecting each of the marks on the basis of the values of the measured times; and controlling the rotational velocity of the disk on the basis of the measured time of the specific pattern of the detected mark, thereby making the linear velocity of the detected mark constant.

REFERENCES:
patent: 4006292 (1977-02-01), Schaefer
Patent Abstracts of Japan, vol. 9, No. 13 (P-328)(1736), Jan. 19, 1985; and JP-A-59 160 866 (Pioneer K.K.) 11-09-1984.
Bulthuls et al., (Aug. 1979), IEEE, pp. 26-33.

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