Patent · US Expired

Combined longitudinal and transversal tracking

US6122134A · kind A · utility

3Cited by

4References

5Claims

0Family size

Assignee

Deutsche Thomson-Brandt GmbH · DE

Inventors

Jurgen Kaaden · Villingen-Schwenningen, DE
Klaus Oldermann · Villingen-Schwenningen, DE
Peter Mahr · Cochem, DE
Gerhard Reiner · Villingen-Schwenningen, DE
Bruno Weihs · Sèvres, FR

Key dates

Filing date	Dec 15, 1997
Grant date	Sep 19, 2000
Priority date	—
Expiry date	Dec 15, 2017

Classification

Technology area (CPC G)Physics
CPC primaryG11B21/10
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

An information storage medium has at least a longitudinal bundle comprising three servo tracks (3, 4, 5). The bundle is arranged in consecutive tracking units (T(N)) of a determined longitudinal length. Surfaces of said servo tracks present either a first or a second characteristic (6, 7) and vary in size and distribution inside the tracking units. The bundles may contain longitudinally stored identification information. Methods for obtaining tracking signals indicating a transversal offset between a reading head and the bundle and for retrieving identification information are disclosed. Also methods for obtaining tracking units in which transversal tracking code is combined with distinct information are described.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.