Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1988-10-12
1990-08-14
Stephan, Steven L.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
3692751, 369 4411, G11B 718, G11B 700
Patent
active
049493302
ABSTRACT:
Apparatus is described for pre-forming a relief structure of optically detectable servo-track portions and sector addresses on the recording layer of a record-carrier body, the maximum transverse width of the servo-track portions and sector addresses being the same and exceeding approximately 1/2 the track period P.sub.r but being less than approximately 3/4 P.sub.r. This enables the servo-track portions to be tracked in an optimum manner by a radiation beam and the sector-addresses and the information recorded by the user produce a read-out signal of high amplitude.
REFERENCES:
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patent: 4230915 (1980-10-01), Dil et al.
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patent: 4499574 (1985-02-01), Braat
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patent: 4665512 (1987-05-01), Ando
Pasman Johannes H. T.
Van Hijningen Nicolaas C. J. A.
Eason Leroy
Nguyen Hoa T.
Stephan Steven L.
Tamoshunas Algy
U.S. Philips Corporation
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