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GB2052132B - Optical system for reproducing information - Google Patents

Optical system for reproducing information

Info

Publication number
GB2052132B
GB2052132B GB8020215A GB8020215A GB2052132B GB 2052132 B GB2052132 B GB 2052132B GB 8020215 A GB8020215 A GB 8020215A GB 8020215 A GB8020215 A GB 8020215A GB 2052132 B GB2052132 B GB 2052132B
Authority
GB
United Kingdom
Prior art keywords
optical system
reproducing information
reproducing
information
optical
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB8020215A
Other versions
GB2052132A (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi 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
Priority claimed from JP1979085976U external-priority patent/JPS566038U/ja
Priority claimed from JP4559280A external-priority patent/JPS56142507A/en
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Publication of GB2052132A publication Critical patent/GB2052132A/en
Application granted granted Critical
Publication of GB2052132B publication Critical patent/GB2052132B/en
Expired legal-status Critical Current

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
    • G11B7/1356—Double or multiple prisms, i.e. having two or more prisms in cooperation
    • 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
    • G11B7/1372—Lenses
    • G11B7/1378—Separate aberration correction lenses; Cylindrical lenses to generate astigmatism; Beam expanders
    • 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
    • G11B7/1372—Lenses
    • G11B2007/13727—Compound lenses, i.e. two or more lenses co-operating to perform a function, e.g. compound objective lens including a solid immersion lens, positive and negative lenses either bonded together or with adjustable spacing

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)
GB8020215A 1979-06-25 1980-06-20 Optical system for reproducing information Expired GB2052132B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1979085976U JPS566038U (en) 1979-06-25 1979-06-25
JP4559280A JPS56142507A (en) 1980-04-09 1980-04-09 Optical system

Publications (2)

Publication Number Publication Date
GB2052132A GB2052132A (en) 1981-01-21
GB2052132B true GB2052132B (en) 1983-07-06

Family

ID=26385603

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8020215A Expired GB2052132B (en) 1979-06-25 1980-06-20 Optical system for reproducing information

Country Status (5)

Country Link
CA (1) CA1135851A (en)
DE (1) DE3023617A1 (en)
FR (1) FR2460022B1 (en)
GB (1) GB2052132B (en)
NL (1) NL8003540A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4406520A (en) * 1980-08-14 1983-09-27 Universal Pioneer Corporation Beam splitter optical system of signal pickup device
JPS5958637A (en) * 1982-09-28 1984-04-04 Sony Corp Optical reproducing device
JP2633535B2 (en) * 1986-09-18 1997-07-23 ソニー株式会社 Optical pickup device
US4890901A (en) * 1987-12-22 1990-01-02 Hughes Aircraft Company Color corrector for embedded prisms
KR100200873B1 (en) * 1996-01-11 1999-06-15 윤종용 Optical pickup
DE19816040A1 (en) * 1998-04-09 1999-10-14 Heidelberger Druckmasch Ag Gradient aperture for exposure devices

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2178245A (en) * 1936-06-24 1939-10-31 Klangfilm Gmbh Sound recording apparatus
DE2638276C3 (en) * 1976-08-25 1981-03-12 Remy, Ernst, Dipl.-Phys. Dr., 8000 München Optical pinhole for laser technology applications
NL7703076A (en) * 1977-03-22 1978-09-26 Philips Nv DEVICE FOR READING A RADIATION-REFLECTING RECORD CARRIER.

Also Published As

Publication number Publication date
NL8003540A (en) 1980-12-30
FR2460022B1 (en) 1987-09-11
GB2052132A (en) 1981-01-21
FR2460022A1 (en) 1981-01-16
CA1135851A (en) 1982-11-16
DE3023617A1 (en) 1981-01-08

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19960620