JPS5771538A - Optical pickup device - Google Patents

Optical pickup device

Info

Publication number
JPS5771538A
JPS5771538A JP55147307A JP14730780A JPS5771538A JP S5771538 A JPS5771538 A JP S5771538A JP 55147307 A JP55147307 A JP 55147307A JP 14730780 A JP14730780 A JP 14730780A JP S5771538 A JPS5771538 A JP S5771538A
Authority
JP
Japan
Prior art keywords
beam splitter
polarizing beam
passes
reflected
splitter
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.)
Granted
Application number
JP55147307A
Other languages
Japanese (ja)
Other versions
JPS6115497B2 (en
Inventor
Yoshio Miyake
Riichi Saeki
Toshio Takei
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 JP55147307A priority Critical patent/JPS5771538A/en
Publication of JPS5771538A publication Critical patent/JPS5771538A/en
Publication of JPS6115497B2 publication Critical patent/JPS6115497B2/ja
Granted 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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)

Abstract

PURPOSE:To reduce the size of a pickup and simplify its adjustment by utilizing a polarizing beam splitter as 4-terminal network, and superposing the optical path between a semiconductor laser and the polarizing beam splitter as well as between the polarizing beam splitter and a photodetector virtually perfectly spacially. CONSTITUTION:The linearly polarized light emitted from a semiconductor laser 1 is reflected by a polarizing beam splitter 4 through a collimating lens 2, and is made incident to a grating 11 through a 1/4 wavelength plate 51. The diffracted light thereof passes through the plate 51, the beam splitter 4 then through a 1/4 wavelength plate 52 and is condensed onto a disc surface 21 by a condenser lens 6. The reflected light thereof goes backward, is reflected by the splitter 4, passes through a 1/4 wavelength plate 53 and is made incident to a cylindrical lens which is inclined slightly. The reflected light thereof passes through the splitter 4, and is condensed at a photodetector 9 located in the position slightly differing from the laser 1 by the lens 2. Thereby, the pickup is made small in size and its adjustment is simplified.
JP55147307A 1980-10-21 1980-10-21 Optical pickup device Granted JPS5771538A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55147307A JPS5771538A (en) 1980-10-21 1980-10-21 Optical pickup device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55147307A JPS5771538A (en) 1980-10-21 1980-10-21 Optical pickup device

Publications (2)

Publication Number Publication Date
JPS5771538A true JPS5771538A (en) 1982-05-04
JPS6115497B2 JPS6115497B2 (en) 1986-04-24

Family

ID=15427229

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55147307A Granted JPS5771538A (en) 1980-10-21 1980-10-21 Optical pickup device

Country Status (1)

Country Link
JP (1) JPS5771538A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5124868A (en) * 1989-01-25 1992-06-23 Olympus Optical Co., Ltd. Magneto-optic player with improved c/n ratio
JP2008194645A (en) * 2007-02-15 2008-08-28 Komatsu Ltd Wood crushing bit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5124868A (en) * 1989-01-25 1992-06-23 Olympus Optical Co., Ltd. Magneto-optic player with improved c/n ratio
JP2008194645A (en) * 2007-02-15 2008-08-28 Komatsu Ltd Wood crushing bit

Also Published As

Publication number Publication date
JPS6115497B2 (en) 1986-04-24

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