OPTICAL PICKUP AND INFORMATION RECORDER/REPRODUCER

WIPO Patent Application WO/2006/112135

A1

An optical pickup which records/reproduces information in/from a recording medium corresponding to three different recording formats while realizing reduction in size. An optical system for CD and DVD and an optical system for BD (Blu-ray Disc) are provided independently and each optical system is provided with a light source unit (10) packaging a second semiconductor laser (12) for DVD and a third semiconductor laser (13) for CD, and a first semiconductor laser (11) for BD. A dichroic PBS (211) and a half mirror (212) are provided at a separating section (21) of going path/return path wherein (a) a light beam outputted from the first semiconductor laser (11) is led to a first collimator lens (22) and a light beam outputted from the light source unit (10) is led to a second collimator lens (23), and (b) light is led to a light receiving section (3) by combining the optical paths of reflected light from an optical disc (DK). Consequently, single detector optical pickup (PU) is realized and the size is reduced.

KIKUCHI IKUYA (JP)
OGASAWARA MASAKAZU (JP)
SATO MAKOTO (JP)
KOYANAGI HAJIME (JP)
KOIKE KATSUHIRO (JP)

PCT/JP2006/303154

October 26, 2006

February 22, 2006

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PIONEER CORP (JP)
KIKUCHI IKUYA (JP)
OGASAWARA MASAKAZU (JP)
SATO MAKOTO (JP)
KOYANAGI HAJIME (JP)
KOIKE KATSUHIRO (JP)

G11B7/135; G11B7/13

JP2004103189A	2004-04-02
JP2000276766A	2000-10-06
JP2004319062A	2004-11-11

Ishikawa, Yasuo (17-11 Shiba 2-chom, Minato-ku Tokyo 14, JP)

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