Patent · US Active

Optical pickup

US7541564B2 · kind B2 · utility

1Cited by

2References

6Claims

0Family size

Assignee

Thomson Licensing · FR

Inventors

Joachim Knittel · Tuttlingen, DE
Hartmut Richter · Villingen-Schwenningen, DE
Gael Pilard · Aspenhausiedlung, DE

Key dates

Filing date	May 23, 2006
Grant date	Jun 2, 2009
Priority date	—
Expiry date	Jan 18, 2027

Classification

Technology area (CPC G)Physics
CPC primaryG11B7/24
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

The invention relates to an optical pickup for an optical recording medium, an electrically controlled diffraction grating suitable for use in such a pickup, and to an apparatus for reading from and/or writing to optical recording media using such an optical pickup or diffraction grating.According to the invention, an optical pickup for optical recording media having two or more data tracks, with a light source for emitting a light beam for reading from and/or writing to an optical recording medium, includes an electrically controlled diffraction grating, which is switchable between at least two states for generating one or more light beams from the light beam emitted by the light source for reading from and/or writing to one or more of the data tracks.

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