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JPS56158319A - Light projecting device - Google Patents

Light projecting device

Info

Publication number
JPS56158319A
JPS56158319A JP6247780A JP6247780A JPS56158319A JP S56158319 A JPS56158319 A JP S56158319A JP 6247780 A JP6247780 A JP 6247780A JP 6247780 A JP6247780 A JP 6247780A JP S56158319 A JPS56158319 A JP S56158319A
Authority
JP
Japan
Prior art keywords
laser beam
lens
semiconductor laser
turned
grating
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
JP6247780A
Other languages
Japanese (ja)
Inventor
Kazuo Okada
Mitsushige Kondo
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP6247780A priority Critical patent/JPS56158319A/en
Publication of JPS56158319A publication Critical patent/JPS56158319A/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
    • G11B7/1353—Diffractive elements, e.g. holograms or gratings
    • 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)
  • Semiconductor Lasers (AREA)

Abstract

PURPOSE:To simplify the control and at the same time realize a miniaturization with a light weight for a projecting device using a semiconductor laser beam source which is used to an optical information reproducing device, by correcting the beam section form of the semiconductor laser beam source to a circular shape by means of a diffractive element which causes a deflection of light. CONSTITUTION:The beams emitted from a semiconductor laser beam source 1 are turned parallel by a collimator lens 2 and then incident to a diffraction grating 3 for correction. The beams passed through the grating 3 are diffracted and go toward the direction which is deflected by an angle theta from the course (toward dotted lines) of beam in case no grating 3 is provided to be made incident to an objective lens 5 after passing through a beam splitter 4. A laser beam is turned into a light spot having a circular section of a diameter of about 1mum by the lens 5 and then converged so that the focus matches with the surface of a disk 6 having a spiral information track. The reflected light modulated by the information of the disk 6 is condensed by the lens 5, separated from the original optical path by the splitter 4 and enters a photodetector 8 to be turned into an electric signal.
JP6247780A 1980-05-09 1980-05-09 Light projecting device Pending JPS56158319A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6247780A JPS56158319A (en) 1980-05-09 1980-05-09 Light projecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6247780A JPS56158319A (en) 1980-05-09 1980-05-09 Light projecting device

Publications (1)

Publication Number Publication Date
JPS56158319A true JPS56158319A (en) 1981-12-07

Family

ID=13201299

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6247780A Pending JPS56158319A (en) 1980-05-09 1980-05-09 Light projecting device

Country Status (1)

Country Link
JP (1) JPS56158319A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59177734A (en) * 1983-03-29 1984-10-08 Toshiba Corp Focal difference detector
JPS59216116A (en) * 1983-05-23 1984-12-06 Pioneer Electronic Corp Semiconductor laser
JPS60130663U (en) * 1984-02-09 1985-09-02 株式会社ニコン semiconductor laser equipment
JPS6137139U (en) * 1984-08-11 1986-03-07 アルプス電気株式会社 optical pick up
JPS61177468U (en) * 1985-04-25 1986-11-05
JPS637528A (en) * 1986-06-25 1988-01-13 Nec Corp Optical pickup device
JPS6310338A (en) * 1986-07-01 1988-01-16 Nec Corp Optical pickup device
JPS63171439A (en) * 1986-11-06 1988-07-15 フィリップス　エレクトロニクス　ネムローゼ　フェンノートシャップ Optical type data recorder
JPH01149237A (en) * 1987-12-04 1989-06-12 Nec Home Electron Ltd Hologram optical head
JPH01149235A (en) * 1987-12-04 1989-06-12 Nec Home Electron Ltd Hologram element
JPH0611666A (en) * 1992-03-09 1994-01-21 American Teleph & Telegr Co <Att> Optical structure
JPH0864890A (en) * 1995-08-04 1996-03-08 Hitachi Ltd Driving method for semiconductor laser

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59177734A (en) * 1983-03-29 1984-10-08 Toshiba Corp Focal difference detector
JPS59216116A (en) * 1983-05-23 1984-12-06 Pioneer Electronic Corp Semiconductor laser
JPS60130663U (en) * 1984-02-09 1985-09-02 株式会社ニコン semiconductor laser equipment
JPS6137139U (en) * 1984-08-11 1986-03-07 アルプス電気株式会社 optical pick up
JPS61177468U (en) * 1985-04-25 1986-11-05
JPS637528A (en) * 1986-06-25 1988-01-13 Nec Corp Optical pickup device
JPS6310338A (en) * 1986-07-01 1988-01-16 Nec Corp Optical pickup device
JPS63171439A (en) * 1986-11-06 1988-07-15 フィリップス　エレクトロニクス　ネムローゼ　フェンノートシャップ Optical type data recorder
JPH01149237A (en) * 1987-12-04 1989-06-12 Nec Home Electron Ltd Hologram optical head
JPH01149235A (en) * 1987-12-04 1989-06-12 Nec Home Electron Ltd Hologram element
JPH0611666A (en) * 1992-03-09 1994-01-21 American Teleph & Telegr Co <Att> Optical structure
JPH0864890A (en) * 1995-08-04 1996-03-08 Hitachi Ltd Driving method for semiconductor laser

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