Disc-shaped record medium

Details Disc-shaped record medium Disc-shaped record medium

1993-04-21

1994-12-13

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692751, G11B 2012

Patent

active

053734980

ABSTRACT:
A disc-shaped record medium provided with an information recording area including tracks for recording information therein, which information recording area is divided into a plurality of circular recording areas in the radial direction thereof. Each of the circular recording areas includes at least a first block wherein individual track pitches are gradually reduced in accordance with the radial distance from the center portion of the record medium. Also, a second block may be provided following the first block, in which track pitches are gradually increased in proportion to the radial distance from the center portion of the record medium. With the disc-shaped record medium constructed as such, not only can the recording capacity thereof as a whole be increased, but smooth shifting of the head for an information recording or reproducing operation is also obtained.

REFERENCES:
patent: 5239533 (1993-08-01), Yoshimaru et al.
patent: 5270991 (1993-12-01), Verboom

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