WO2008126807A1 - 光ヘッド装置 - Google Patents
光ヘッド装置 Download PDFInfo
- Publication number
- WO2008126807A1 WO2008126807A1 PCT/JP2008/056812 JP2008056812W WO2008126807A1 WO 2008126807 A1 WO2008126807 A1 WO 2008126807A1 JP 2008056812 W JP2008056812 W JP 2008056812W WO 2008126807 A1 WO2008126807 A1 WO 2008126807A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- optical
- transmittance
- region
- head device
- light
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1381—Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
- G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers
Abstract
光源から出射する光を光ディスクの情報記録層で反射し光検出器に導く光ヘッド装置において、光ディスクから光検出器までの光路中に、透過率の高い第1の領域、透過率の低い第2の領域、その中間の値となる透過率の第3の領域を有する減光素子を配置し、クロストークの原因となる情報記録層と異なる層からの戻り光を光検出器で低減させる。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020097020901A KR101450934B1 (ko) | 2007-04-06 | 2008-04-04 | 광헤드 장치 |
US12/574,131 US20100091634A1 (en) | 2007-04-06 | 2009-10-06 | Optical head device |
Applications Claiming Priority (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007-100785 | 2007-04-06 | ||
JP2007100785 | 2007-04-06 | ||
JP2007226313 | 2007-08-31 | ||
JP2007-226313 | 2007-08-31 | ||
JP2007266594A JP2009099159A (ja) | 2007-10-12 | 2007-10-12 | 光ヘッド装置 |
JP2007-266594 | 2007-10-12 | ||
JP2007-334859 | 2007-12-26 | ||
JP2007334859 | 2007-12-26 | ||
JP2008009506A JP2009076187A (ja) | 2007-08-31 | 2008-01-18 | 光ヘッド装置 |
JP2008-009506 | 2008-01-18 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/574,131 Continuation US20100091634A1 (en) | 2007-04-06 | 2009-10-06 | Optical head device |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008126807A1 true WO2008126807A1 (ja) | 2008-10-23 |
Family
ID=39863905
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2008/056812 WO2008126807A1 (ja) | 2007-04-06 | 2008-04-04 | 光ヘッド装置 |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2008126807A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100321627A1 (en) * | 2008-02-27 | 2010-12-23 | Asahi Glass Co., Ltd. | Wavelength selective optical rotator and optical head device |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05234121A (ja) * | 1992-02-24 | 1993-09-10 | Alps Electric Co Ltd | 光ヘッド装置 |
JPH0877592A (ja) * | 1994-08-31 | 1996-03-22 | Nec Corp | 光ヘッド用フィルタ装置 |
JPH08147749A (ja) * | 1994-11-15 | 1996-06-07 | Nec Corp | 光ヘッド装置 |
JPH1055563A (ja) * | 1996-04-30 | 1998-02-24 | Samsung Electron Co Ltd | 対物レンズ装置及びこれを採用した光ピックアップ装置 |
JP2005032423A (ja) * | 2003-07-10 | 2005-02-03 | Samsung Electronics Co Ltd | フォーカスオフセットを低減できる光ピックアップ及びそれを採用した光記録及び/または再生機器 |
JP2008027507A (ja) * | 2006-07-20 | 2008-02-07 | Sanyo Electric Co Ltd | 光ピックアップ装置 |
JP2008130219A (ja) * | 2006-11-27 | 2008-06-05 | Sanyo Electric Co Ltd | 光ピックアップ装置 |
JP2008130167A (ja) * | 2006-11-21 | 2008-06-05 | Sanyo Electric Co Ltd | 光ピックアップ装置 |
-
2008
- 2008-04-04 WO PCT/JP2008/056812 patent/WO2008126807A1/ja active Application Filing
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05234121A (ja) * | 1992-02-24 | 1993-09-10 | Alps Electric Co Ltd | 光ヘッド装置 |
JPH0877592A (ja) * | 1994-08-31 | 1996-03-22 | Nec Corp | 光ヘッド用フィルタ装置 |
JPH08147749A (ja) * | 1994-11-15 | 1996-06-07 | Nec Corp | 光ヘッド装置 |
JPH1055563A (ja) * | 1996-04-30 | 1998-02-24 | Samsung Electron Co Ltd | 対物レンズ装置及びこれを採用した光ピックアップ装置 |
JP2005032423A (ja) * | 2003-07-10 | 2005-02-03 | Samsung Electronics Co Ltd | フォーカスオフセットを低減できる光ピックアップ及びそれを採用した光記録及び/または再生機器 |
JP2008027507A (ja) * | 2006-07-20 | 2008-02-07 | Sanyo Electric Co Ltd | 光ピックアップ装置 |
JP2008130167A (ja) * | 2006-11-21 | 2008-06-05 | Sanyo Electric Co Ltd | 光ピックアップ装置 |
JP2008130219A (ja) * | 2006-11-27 | 2008-06-05 | Sanyo Electric Co Ltd | 光ピックアップ装置 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100321627A1 (en) * | 2008-02-27 | 2010-12-23 | Asahi Glass Co., Ltd. | Wavelength selective optical rotator and optical head device |
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