Apparatus for pre-forming servo-track portions and sector addres

Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium

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3692751, 369 4411, G11B 718, G11B 700

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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.

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patent: 4230915 (1980-10-01), Dil et al.
patent: 4363116 (1982-12-01), Kleuters et al.
patent: 4499574 (1985-02-01), Braat
patent: 4587648 (1986-05-01), Ando
patent: 4665512 (1987-05-01), Ando

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