WO2009072472A1 - 光ピックアップ装置 - Google Patents
光ピックアップ装置 Download PDFInfo
- Publication number
- WO2009072472A1 WO2009072472A1 PCT/JP2008/071813 JP2008071813W WO2009072472A1 WO 2009072472 A1 WO2009072472 A1 WO 2009072472A1 JP 2008071813 W JP2008071813 W JP 2008071813W WO 2009072472 A1 WO2009072472 A1 WO 2009072472A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- polarization
- laser beam
- light
- route
- pickup device
- 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
- G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
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- 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
- G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Head (AREA)
Abstract
【課題】2つの対物レンズを経由した各ディスクからの反射光を光検出器の受光面上に適正に収束させ得る光ピックアップ装置を提供する。 【解決手段】複屈折素子15は、偏光ビームスプリッタ14からHD用対物レンズ21に向かう際(往路)のレーザ光の偏光方向(P偏光)と、HD用対物レンズ21から偏光ビームスプリッタ14に向かう際(復路)のレーザ光の偏光方向(S偏光)とで屈折率が相違する。このため、往路と復路とで、レーザ光の光路に光路差ΔLが生じる。この光路差ΔLが、HDからの反射光の収束位置のずれ量ΔLpdに一致する複屈折素子15をガラス板40に替えて配置することにより、HDからの反射光を光検出器28の受光面上に適正に収束させることができる。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007317567 | 2007-12-07 | ||
JP2007-317567 | 2007-12-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009072472A1 true WO2009072472A1 (ja) | 2009-06-11 |
Family
ID=40717652
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2008/071813 WO2009072472A1 (ja) | 2007-12-07 | 2008-12-01 | 光ピックアップ装置 |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2009072472A1 (ja) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006112249A1 (ja) * | 2005-04-15 | 2006-10-26 | Pioneer Corporation | 光ピックアップ装置及び情報記録再生装置 |
JP2007004875A (ja) * | 2005-06-22 | 2007-01-11 | Sony Corp | 光ピックアップ |
JP2008021358A (ja) * | 2006-07-12 | 2008-01-31 | Sanyo Electric Co Ltd | 光ピックアップ装置 |
JP2008257797A (ja) * | 2007-04-05 | 2008-10-23 | Konica Minolta Opto Inc | 光ピックアップ装置及び光ディスク装置 |
-
2008
- 2008-12-01 WO PCT/JP2008/071813 patent/WO2009072472A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006112249A1 (ja) * | 2005-04-15 | 2006-10-26 | Pioneer Corporation | 光ピックアップ装置及び情報記録再生装置 |
JP2007004875A (ja) * | 2005-06-22 | 2007-01-11 | Sony Corp | 光ピックアップ |
JP2008021358A (ja) * | 2006-07-12 | 2008-01-31 | Sanyo Electric Co Ltd | 光ピックアップ装置 |
JP2008257797A (ja) * | 2007-04-05 | 2008-10-23 | Konica Minolta Opto Inc | 光ピックアップ装置及び光ディスク装置 |
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