JPS5347804A - Optical reproducer - Google Patents

Optical reproducer

Info

Publication number
JPS5347804A
JPS5347804A JP12245176A JP12245176A JPS5347804A JP S5347804 A JPS5347804 A JP S5347804A JP 12245176 A JP12245176 A JP 12245176A JP 12245176 A JP12245176 A JP 12245176A JP S5347804 A JPS5347804 A JP S5347804A
Authority
JP
Japan
Prior art keywords
optical reproducer
reproducer
optical
reproduced
shielding
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
JP12245176A
Other languages
Japanese (ja)
Inventor
Kazuo Okada
Kazuo Hirasawa
Kiyomoto Nishi
Sadanobu Kawabe
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 JP12245176A priority Critical patent/JPS5347804A/en
Publication of JPS5347804A publication Critical patent/JPS5347804A/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)
  • Optical Head (AREA)

Abstract

PURPOSE:To eliminate the non-diffracted light by shielding the semicircular portion of the aperture of a condensing lens and projected on a recording element of concave and convex type so that the reflected light may be reproduced.
JP12245176A 1976-10-12 1976-10-12 Optical reproducer Pending JPS5347804A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12245176A JPS5347804A (en) 1976-10-12 1976-10-12 Optical reproducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12245176A JPS5347804A (en) 1976-10-12 1976-10-12 Optical reproducer

Publications (1)

Publication Number Publication Date
JPS5347804A true JPS5347804A (en) 1978-04-28

Family

ID=14836159

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12245176A Pending JPS5347804A (en) 1976-10-12 1976-10-12 Optical reproducer

Country Status (1)

Country Link
JP (1) JPS5347804A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60191445A (en) * 1984-03-12 1985-09-28 Matsushita Electric Ind Co Ltd Reproduction optical device
US4664909A (en) * 1980-12-29 1987-05-12 Colgate-Palmolive Company Stable suspension of powder in alcoholic media
US4822875A (en) * 1986-12-17 1989-04-18 The Procter & Gamble Company Sucrose polyesters which behave like cocoa butters
JPH0212624A (en) * 1988-06-29 1990-01-17 Nec Corp Optical head device
JPH0291829A (en) * 1988-09-28 1990-03-30 Nec Corp Optical head device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4664909A (en) * 1980-12-29 1987-05-12 Colgate-Palmolive Company Stable suspension of powder in alcoholic media
JPS60191445A (en) * 1984-03-12 1985-09-28 Matsushita Electric Ind Co Ltd Reproduction optical device
US4822875A (en) * 1986-12-17 1989-04-18 The Procter & Gamble Company Sucrose polyesters which behave like cocoa butters
JPH0212624A (en) * 1988-06-29 1990-01-17 Nec Corp Optical head device
JPH0291829A (en) * 1988-09-28 1990-03-30 Nec Corp Optical head device

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