Title:
光学記録媒体から読み出し及び/又は該媒体へ書き込む装置
Document Type and Number:
Japanese Patent JP4859009
Kind Code:
B2
Abstract:
The present invention relates to an appliance for reading from and/or writing to optical recording media 1 having a first laser diode LD1 for producing a first scanning beam AS1 at a first wavelength lambda1 and having a second laser diode LD2 for producing a second scanning beam AS2 at a second wavelength lambda2, with the scanning beams AS1, AS2 running along a common optical axis 9, scanning an information layer 6 on the recording medium 1 and falling on a single photodetector 8 in order to produce an information signal IS, with a beam combination element being arranged at one point on the optical axis 9. According to the invention, the beam combination element is a diffraction grating 12.
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Inventors:
Danbach Zorren
Richter Hartmut
Richter Hartmut
Application Number:
JP2002500381A
Publication Date:
January 18, 2012
Filing Date:
May 29, 2001
Export Citation:
Assignee:
Thomson Licensing
International Classes:
G11B7/0045; G11B7/135; G11B7/1353; G11B7/00
Domestic Patent References:
| JPH11134702A | 1999-05-21 | |||
| JPH08212557A | 1996-08-20 | |||
| JPH10289468A | 1998-10-27 | |||
| JPH11185282A | 1999-07-09 | |||
| JP2000048386A | 2000-02-18 |
Attorney, Agent or Firm:
Riki Kikoshi
Takashi Ishii
Kuramochi Makoto
Takashi Ishii
Kuramochi Makoto