JPS5771536A - Optical pickup device - Google Patents

Optical pickup device

Info

Publication number
JPS5771536A
JPS5771536A JP55146524A JP14652480A JPS5771536A JP S5771536 A JPS5771536 A JP S5771536A JP 55146524 A JP55146524 A JP 55146524A JP 14652480 A JP14652480 A JP 14652480A JP S5771536 A JPS5771536 A JP S5771536A
Authority
JP
Japan
Prior art keywords
plate
polarizing beam
beam splitter
wavelength plate
condensed
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
JP55146524A
Other languages
Japanese (ja)
Other versions
JPS6115495B2 (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 JP55146524A priority Critical patent/JPS5771536A/en
Publication of JPS5771536A publication Critical patent/JPS5771536A/en
Publication of JPS6115495B2 publication Critical patent/JPS6115495B2/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
    • G11B7/12—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

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • 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 refleced by a polarizing beam splitter 4, and is made into circularly polarized light by passing through a 1/4 wavelength plate 51. This light is reflected by a reflecting mirror 11 which is slightly inclined with respect to the optical path and transmits through the plate 51 then through the splitter 4. The transmitted light is reflected by the splitter 4 through a 1/4 wavelength plate 52, a grating 12, and the plate 52, and is condensed at a disc surface 21 by a 1/4 wavelength plate 52, a grating 12, and the plate 52, and is condensed at a disc surface 21 by a 1/4 wavelength plate 53 and a condenser lens 6. The reflected light thereof goes backward and is condensed at a photodetector 9 located in the position slightly differing from the laser 1 by a collimating lens 2. Thereby, the pickup is made small in size and its adjustment is simplified.
JP55146524A 1980-10-20 1980-10-20 Optical pickup device Granted JPS5771536A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55146524A JPS5771536A (en) 1980-10-20 1980-10-20 Optical pickup device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55146524A JPS5771536A (en) 1980-10-20 1980-10-20 Optical pickup device

Publications (2)

Publication Number Publication Date
JPS5771536A true JPS5771536A (en) 1982-05-04
JPS6115495B2 JPS6115495B2 (en) 1986-04-24

Family

ID=15409592

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55146524A Granted JPS5771536A (en) 1980-10-20 1980-10-20 Optical pickup device

Country Status (1)

Country Link
JP (1) JPS5771536A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5563870A (en) * 1995-02-14 1996-10-08 Eastman Kodak Company Optical write/read head with laser power control

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5563870A (en) * 1995-02-14 1996-10-08 Eastman Kodak Company Optical write/read head with laser power control

Also Published As

Publication number Publication date
JPS6115495B2 (en) 1986-04-24

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