Patent · US Expired

Pick-up for selectively reading and writing an optical recording medium having pits and magnetic domains

US5325350A · kind A · utility

6Cited by

5References

19Claims

0Family size

Assignee

Deutsche Thomson-Brandt GmbH · DE

Inventors

Yasuaki Morimoto · Villingen-Schwenningen, DE
Friedhelm Zucker · Mönchweiler, DE
Christian Buchler · Villingen-Schwenningen, DE
Heinz-Jorg Schroder · Erbach, DE

Key dates

Filing date	Jun 21, 1993
Grant date	Jun 28, 1994
Priority date	—
Expiry date	Jun 21, 2013

Classification

Technology area (CPC G)Physics
CPC primaryG11B13/04
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

The beam of light reflected from an optico-magnetic recorded medium is reflected by an optical pick-up onto one optical or another in accordance with the direction that the beam's plane of polarization is rotated in. A data signal is obtained from the difference in the photovoltages of the two photodetectors.

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