JPS5532249A - Optical recorder and reproducing device - Google Patents

Optical recorder and reproducing device

Info

Publication number
JPS5532249A
JPS5532249A JP10408178A JP10408178A JPS5532249A JP S5532249 A JPS5532249 A JP S5532249A JP 10408178 A JP10408178 A JP 10408178A JP 10408178 A JP10408178 A JP 10408178A JP S5532249 A JPS5532249 A JP S5532249A
Authority
JP
Japan
Prior art keywords
light
signal
cylindrical lens
record
shifted
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.)
Pending
Application number
JP10408178A
Other languages
Japanese (ja)
Inventor
Tomio Yoshida
Akifumi Nakada
Shunji Harikae
Toshio Sato
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP10408178A priority Critical patent/JPS5532249A/en
Priority to US06/033,005 priority patent/US4272651A/en
Publication of JPS5532249A publication Critical patent/JPS5532249A/en
Pending 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
    • G11B7/1372—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
    • G11B7/1398—Means for shaping the cross-section of the beam, e.g. into circular or elliptical cross-section

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)

Abstract

PURPOSE:To record, reproduce and monitor signal by using a single light source by making a light beam thick by changing a photo image in reproducing signals, by focusing light from a light source, whose light emitting surface is rectangular, through a cylindrical lens. CONSTITUTION:Since the light emitting surface of semiconductor laser 10 is rectangular, cylindrical lenses 12 and 13 are interposed and in reproducing, cylindrical lens 13 is shifted in a light-axial direction in order to change the shape of the beam nearly in a square. To record a recording signal on the disc, the optical change of a recording material is caused by the beam waist of light made thin in a shape close to a square. To regenerate the recorded signal, irradiation with light of wider diameter than the width of an information track is needed. For the purpose, cylindrical lens 13 is shifted light-axially to obtain a light image expanded only in a direction perpendicular to the information track, thereby regenerating and monitoring the signal.
JP10408178A 1978-04-28 1978-08-25 Optical recorder and reproducing device Pending JPS5532249A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP10408178A JPS5532249A (en) 1978-08-25 1978-08-25 Optical recorder and reproducing device
US06/033,005 US4272651A (en) 1978-04-28 1979-04-24 Optical system having diode laser light source

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10408178A JPS5532249A (en) 1978-08-25 1978-08-25 Optical recorder and reproducing device

Publications (1)

Publication Number Publication Date
JPS5532249A true JPS5532249A (en) 1980-03-06

Family

ID=14371185

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10408178A Pending JPS5532249A (en) 1978-04-28 1978-08-25 Optical recorder and reproducing device

Country Status (1)

Country Link
JP (1) JPS5532249A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19955843A1 (en) * 1999-11-19 2001-06-13 Zeiss Carl Jena Gmbh Optical illumination device e.g. for microscope or machine work surface, has transformation device converting rectangle in light field into parallelogram at illuminated surface

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5184206A (en) * 1974-12-09 1976-07-23 Teletype Corp
JPS5371846A (en) * 1976-12-08 1978-06-26 Mansei Kogyo Kk Optics to obtain equal direction spot from various direction light beam

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5184206A (en) * 1974-12-09 1976-07-23 Teletype Corp
JPS5371846A (en) * 1976-12-08 1978-06-26 Mansei Kogyo Kk Optics to obtain equal direction spot from various direction light beam

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19955843A1 (en) * 1999-11-19 2001-06-13 Zeiss Carl Jena Gmbh Optical illumination device e.g. for microscope or machine work surface, has transformation device converting rectangle in light field into parallelogram at illuminated surface
DE19955843B4 (en) * 1999-11-19 2005-10-13 Carl Zeiss Jena Gmbh projection system

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