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

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

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:
patent: 3983317 (1976-09-01), Glorioso
patent: 4115809 (1978-09-01), Ueno
patent: 4178615 (1979-12-01), Shimooka et al.
patent: 4209793 (1980-06-01), Ueno
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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