Rotary recording medium having a guide track and recording and r

Details Rotary recording medium having a guide track and recording and r Rotary recording medium having a guide track and recording and r

1986-06-12

1989-02-07

Faber, Alan

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369275, 369111, 369279, 358342, 250202, G11B 7007, G11B 7095

Patent

active

048036773

ABSTRACT:
A disc comprises a recording surface which is divided into a plurality of equiangular sectoral regions and a guide track formed on the recording surface. Each track turn of the guide track is constituted by a row of pits formed in every other equiangular sectoral regions, and the pit is only formed in one of two mutually adjacent track turns of the guide track in each equiangular sectoral region so that the pits are formed in every other track turns in a radial direction of the disc in each equiangular sectoral region. An apparatus for playing the disc comprises a circuit for producing a switching pulse signal having a period dependent on a period of the pits of the guide track based on signals which are reproduced from the two mutually adjacent track turns by sub light beams, a circuit for alternately inverting a polarity of signals which are reproduced from the two mutually adjacent track turns by a main light beam for every one half period of the switching pulse signal and for generating a tracking error signal, a tracking device, and a device for recording and reproducing an information signal on and from an intermediate part of the disc between the two mutually adjacent track turns.

REFERENCES:
patent: 4223349 (1980-09-01), Dakin
patent: 4472748 (1984-09-01), Kato
patent: 4486791 (1984-12-01), Wada

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