Optical head device and recording/reproduction device

Details Optical head device and recording/reproduction device Optical head device and recording/reproduction device

2009-08-06

2011-10-11

Haley, Joseph (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112290

Reexamination Certificate

active

08036093

ABSTRACT:
An optical head device includes a first light source and a second light source respectively emitting a first light beam and a second light beam, a luminous flux separating section selectively separating the first and second light beams for which the same optical path is used, to first and second optical paths, respectively, and a first objective lens converging the first light beam that has been separated to the first optical path on the first optical information recording medium. Further, the optical head device includes a second objective lens made of resin and converging the second light beam separated to the second optical path on the second optical information recording medium, and a first filtering section formed on a beam exit face of the second objective lens and reducing the transmittance of the first light beam to be lower than transmittance of the second light beam.

REFERENCES:
patent: 2005/0249099 (2005-11-01), Komma
patent: 2007/0253311 (2007-11-01), Horinouchi et al.
patent: 2009/0110011 (2009-04-01), Nishikawa et al.
patent: 2008/001636 (2008-01-01), None

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