Information disc apparatus

Details Information disc apparatus Information disc apparatus

1990-09-27

1991-09-17

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 58, G11B 700

Patent

active

050501500

ABSTRACT:
An apparatus for reading and reproducing information on and from an optical disc in accordance with data in a form of bar codes representative of characteristics of the optical disc, the data having at least two pre-recorded sectors separated from each other by a non-record intersector gap therebetween in a specific area on the optical disc, the pre-recorded sector having recorded segments spaced by a non-record inter-segment gap shorter than the inter-sector gap. The apparatus includes an optical head for optically reproducing the information from the optical disc, a motor for placing the optical head on the specific area of the optical disc, a circuit for converting the information reproduced by the optical head into a binary data, a first counter for measuring the segment of the pre-recorded sector based on the binary data from the converting circuit, a second counter for measuring the inter-segment gap based on the binary data from the converting circuit with a limited capacity not sufficient to measure the intersector gas and a processor for processing the data based on results of measurements obtained by the first and second counters.

REFERENCES:
patent: 4641294 (1987-02-01), Yoshimaru
patent: 4907214 (1990-03-01), Nagano et al.
patent: 4918676 (1990-04-01), Miyasaka
patent: 4972399 (1990-11-01), Miyasaka

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