Patent · US Active

Apparatus for recording angular multiplexed pits

US8203925B2 · kind B2 · utility

0Cited by

6References

6Claims

0Family size

Assignee

Thomson Licensing · FR

Inventors

Joachim Knittel · Tuttlingen, DE
Hartmut Richter · Villingen-Schwenningen, DE
Stephan Knappmann · Zimmern ob Rottweil, DE

Key dates

Filing date	Nov 29, 2005
Grant date	Jun 19, 2012
Priority date	—
Expiry date	Sep 5, 2027

Classification

Technology area (CPC G)Physics
CPC primaryG11B7/24088
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

An apparatus for recording angular multiplexed pits on optical recording media using a device for generating a light beam with an asymmetric intensity distribution is described. The device for generating a light beam with an asymmetric intensity distribution has at least one light influencing part for introducing a phase shift of 180° in a first half of the light beam relative to the second half of the light beam, wherein the border between the first half of the light beam and the second half of the light beam is rotatable around an optical axis of the light beam.

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