WO2009072472A1 - Optical pickup device - Google Patents
Optical pickup device 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
- 230000003287 optical effect Effects 0.000 title abstract 5
- 230000010287 polarization Effects 0.000 abstract 6
- 239000011521 glass Substances 0.000 abstract 1
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
-
- 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
Provided is an optical pickup device which can appropriately converge a light reflected from each disc via two objective lenses onto a light reception surface of a photo-detector. A birefringent element (15) has different refractive indexes in the laser light polarization direction (P polarization) when the laser beam goes from a polarization beam splitter (14) to an HD objective lens (21) (approach route) and in the laser beam polarization direction (S polarization) when the laser beam goes from the HD objective lens (21) (return route) to the polarization splitter (14). Accordingly, there arises an optical path difference ΔL between the optical paths of the laser beam in the approach route and the return route. By replacing a glass plate (40) with the birefringent element (15) having the optical path difference ΔL which coincides with a convergence position shift amount ΔLpd of the light reflected from the HD, it is possible to appropriately converge the reflected light from the HD onto the light reception surface of a photo-detector (28).
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 (en) | 2009-06-11 |
Family
ID=40717652
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2008/071813 WO2009072472A1 (en) | 2007-12-07 | 2008-12-01 | Optical pickup device |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2009072472A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006112249A1 (en) * | 2005-04-15 | 2006-10-26 | Pioneer Corporation | Optical pickup device and information recording/reproducing device |
JP2007004875A (en) * | 2005-06-22 | 2007-01-11 | Sony Corp | Optical pickup |
JP2008021358A (en) * | 2006-07-12 | 2008-01-31 | Sanyo Electric Co Ltd | Optical pickup device |
JP2008257797A (en) * | 2007-04-05 | 2008-10-23 | Konica Minolta Opto Inc | Optical pickup device and optical disk device |
-
2008
- 2008-12-01 WO PCT/JP2008/071813 patent/WO2009072472A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006112249A1 (en) * | 2005-04-15 | 2006-10-26 | Pioneer Corporation | Optical pickup device and information recording/reproducing device |
JP2007004875A (en) * | 2005-06-22 | 2007-01-11 | Sony Corp | Optical pickup |
JP2008021358A (en) * | 2006-07-12 | 2008-01-31 | Sanyo Electric Co Ltd | Optical pickup device |
JP2008257797A (en) * | 2007-04-05 | 2008-10-23 | Konica Minolta Opto Inc | Optical pickup device and optical disk device |
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