JPS55108941A - Optical pickup unit - Google Patents

Optical pickup unit

Info

Publication number
JPS55108941A
JPS55108941A JP1566179A JP1566179A JPS55108941A JP S55108941 A JPS55108941 A JP S55108941A JP 1566179 A JP1566179 A JP 1566179A JP 1566179 A JP1566179 A JP 1566179A JP S55108941 A JPS55108941 A JP S55108941A
Authority
JP
Japan
Prior art keywords
optical system
light
semiconductor laser
laser
disc
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
JP1566179A
Other languages
Japanese (ja)
Inventor
Naoto Mogi
Motoyuki Yamamoto
Yoichi Unno
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP1566179A priority Critical patent/JPS55108941A/en
Publication of JPS55108941A publication Critical patent/JPS55108941A/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

Landscapes

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

Abstract

PURPOSE:To make the optical system of an optical pickup unit simple and small- size to make complicated and precise adjustment needless by using a semiconductor laser having a large-thickness light guide line consisting of muti-layer hetero junction and a narrow-width stripe electrode. CONSTITUTION:The laser light beam radiated from semiconductor laser 1 is condensed by optical system 2 consisting of lenses 2a and 2b and is focused on, for example, video disc 3. The laser light reflected by disc 3 is returned through the light path of optical system 2 and is incident onto semiconductor laser 1. Disc 3 records information, for example, with arrangement of holes, arrangement of convexes and concaves, etc., and information is read by detecting the transmission light or the reflection light of the irradiated laser light. In this case, a little-anisotropy laser light beam can be obtained because semiconductor laser 1 consists of multi- layer hetero junction and the light guide path is 1mu or more thick and the stripe electrode is 5mu or less partially at least, so that the optical system can be simplified to obtain good reproducing.
JP1566179A 1979-02-14 1979-02-14 Optical pickup unit Pending JPS55108941A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1566179A JPS55108941A (en) 1979-02-14 1979-02-14 Optical pickup unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1566179A JPS55108941A (en) 1979-02-14 1979-02-14 Optical pickup unit

Publications (1)

Publication Number Publication Date
JPS55108941A true JPS55108941A (en) 1980-08-21

Family

ID=11894916

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1566179A Pending JPS55108941A (en) 1979-02-14 1979-02-14 Optical pickup unit

Country Status (1)

Country Link
JP (1) JPS55108941A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58155857U (en) * 1982-04-09 1983-10-18 三洋電機株式会社 semiconductor laser
JPS58193654U (en) * 1982-06-18 1983-12-23 三洋電機株式会社 semiconductor laser

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58155857U (en) * 1982-04-09 1983-10-18 三洋電機株式会社 semiconductor laser
JPS58193654U (en) * 1982-06-18 1983-12-23 三洋電機株式会社 semiconductor laser

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