Patent · US Expired

Magneto-optical recording and/or reproducing device

US5375109A · kind A · utility

1Cited by

4References

5Claims

0Family size

Assignee

Deutsche Thomson-Brandt GmbH · DE

Inventors

Yasuaki Morimoto · Villingen-Schwenningen, DE
Friedhelm Zucker · Mönchweiler, DE

Key dates

Filing date	Jan 16, 1992
Grant date	Dec 20, 1994
Priority date	—
Expiry date	Jan 16, 2012

Classification

Technology area (CPC G)Physics
CPC primaryG11B11/10597
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

The two sets of data stored in pits and a magneto-optical layer of an optical recording/reproducing device can be read separately by the use of two lasers. The laser which reads/records the data stored in the pits operates at a wavelength .lambda..sub.1 approximately four times the depth of the pits. The laser which reads/records the data stored in the magneto-optical layer operates at a wavelength .lambda..sub.2 approximately twice the depth of the pits. The wavelength of the laser which reads the magneto-optical layer is adjusted and interference between the two signals is avoided.

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