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.
Type:
Grant
Filed:
November 29, 2005
Date of Patent:
June 19, 2012
Assignee:
Thomson Licsensing
Inventors:
Joachim Knittel, Hartmut Richter, Stephan Knappmann