Title:
OPTICAL INTEGRATED UNIT AND OPTICAL PICKUP DEVICE
Document Type and Number:
WIPO Patent Application WO/2006/025142
Kind Code:
A1
Abstract:
A photodetector (5) of an optical integrated unit is provided with light receiving sections (11, 12, 13, 14) for receiving ± first order diffraction light from a hologram element, and a light receiving section (15) for receiving 0 order diffraction/transmission light. Since tracking control can be carried out based on the information of entire reflected light, unstable tracking due to contamination on the surface of an optical disc, and the like, can be prevented.
Inventors:
SAKAI KEIJI
WATANABE YUKIO
MIYAZAKI OSAMU
WATANABE YUKIO
MIYAZAKI OSAMU
Application Number:
PCT/JP2005/010873
Publication Date:
March 09, 2006
Filing Date:
June 14, 2005
Export Citation:
Assignee:
SHARP KK (JP)
SAKAI KEIJI
WATANABE YUKIO
MIYAZAKI OSAMU
SAKAI KEIJI
WATANABE YUKIO
MIYAZAKI OSAMU
International Classes:
G11B7/09; G11B7/135; (IPC1-7): G11B7/135; G11B7/09
Foreign References:
| JP2000348374A | 2000-12-15 | |||
| JP2004192731A | 2004-07-08 | |||
| JP2004046970A | 2004-02-12 | |||
| JP2003187491A | 2003-07-04 | |||
| JPH0944893A | 1997-02-14 | |||
| JP2002109778A | 2002-04-12 |
Attorney, Agent or Firm:
HARAKENZO WORLD PATENT & TRADEMARK (2-6 Tenjinbashi 2-chome Kita, Kita-k, Osaka-shi Osaka 41, JP)
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