TW200802342A - Optical pickup apparatus - Google Patents

Optical pickup apparatus

Info

Publication number
TW200802342A
TW200802342A TW96111044A TW96111044A TW200802342A TW 200802342 A TW200802342 A TW 200802342A TW 96111044 A TW96111044 A TW 96111044A TW 96111044 A TW96111044 A TW 96111044A TW 200802342 A TW200802342 A TW 200802342A
Authority
TW
Taiwan
Prior art keywords
wavelength
optical
semiconductor laser
recording medium
information recording
Prior art date
Application number
TW96111044A
Other languages
Chinese (zh)
Inventor
Masahiko Nishimoto
Naoki Nakanishi
Masayuki Ono
Yasuyuki Kochi
Original Assignee
Matsushita Electric Ind Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Ind Co Ltd filed Critical Matsushita Electric Ind Co Ltd
Publication of TW200802342A publication Critical patent/TW200802342A/en

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
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/127—Lasers; Multiple laser arrays
    • G11B7/1275—Two or more lasers having different wavelengths
    • 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
    • G11B7/1353—Diffractive elements, e.g. holograms or gratings

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

In a conventional optical pickup device using a two-wavelength semiconductor laser, an optical beam from an inferior optical information recording medium transmits a 1/4 wavelength plate and becomes a p-polarized light instead of an s-polarized light. Accordingly, it is impossible to control a focus tracking error signal. Provided is an optical pickup device including: a first semiconductor laser (103) for emitting an optical beam (102) having a first wavelength corresponding to recording/reproduction to/from a first optical information recording medium (101); a second semiconductor laser (106) for emitting an optical beam (105) having a second wavelength longer than the first semiconductor laser corresponding to a second optical information recording medium (104); a diffraction grating (107) for diffracting an optical beam of the first and the second wavelength into 0 degree diffracted light and plus and minus 1 degree diffracted light; a wavelength plate (108); a polarization hologram element (109) for diffracting a reflected light from the first and the second optical information recording medium; a collimator lens (114); an objective lens (115); and a first light receiving element group (110) to a third light receiving element group (112) for receiving diffracted light from a hologram element.
TW96111044A 2006-03-31 2007-03-29 Optical pickup apparatus TW200802342A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006098797A JP2007273015A (en) 2006-03-31 2006-03-31 Optical pickup device

Publications (1)

Publication Number Publication Date
TW200802342A true TW200802342A (en) 2008-01-01

Family

ID=38563278

Family Applications (1)

Application Number Title Priority Date Filing Date
TW96111044A TW200802342A (en) 2006-03-31 2007-03-29 Optical pickup apparatus

Country Status (3)

Country Link
JP (1) JP2007273015A (en)
TW (1) TW200802342A (en)
WO (1) WO2007114006A1 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10124906A (en) * 1996-10-16 1998-05-15 Sankyo Seiki Mfg Co Ltd Wavelength plate and optical pickup device using the same
JP2001014717A (en) * 1999-04-28 2001-01-19 Matsushita Electronics Industry Corp Optical device
JP2005339766A (en) * 2004-04-23 2005-12-08 Matsushita Electric Ind Co Ltd Optical disk apparatus

Also Published As

Publication number Publication date
JP2007273015A (en) 2007-10-18
WO2007114006A1 (en) 2007-10-11

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