JPS5619567A - Memory unit of optical disc - Google Patents

Memory unit of optical disc

Info

Publication number
JPS5619567A
JPS5619567A JP9552179A JP9552179A JPS5619567A JP S5619567 A JPS5619567 A JP S5619567A JP 9552179 A JP9552179 A JP 9552179A JP 9552179 A JP9552179 A JP 9552179A JP S5619567 A JPS5619567 A JP S5619567A
Authority
JP
Japan
Prior art keywords
disc
enclosed case
window
tightness
concave
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
JP9552179A
Other languages
Japanese (ja)
Inventor
Ryoji Yamaguchi
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 JP9552179A priority Critical patent/JPS5619567A/en
Publication of JPS5619567A publication Critical patent/JPS5619567A/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
    • G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
    • G11B7/0037—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs

Landscapes

  • Rotational Drive Of Disk (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To enable to approach the optical system to the recording surface and to enable the information processing with higher accuracy, by forming the light transmission window which transmits beam light over radial direction to the enclosed case of the disc unit. CONSTITUTION:The concave 22 is formed over the radial direction of the upper cover 10b of the enclosed case 10 and the light transmitting window 23 made of slits is formed at the bottom near the recording surface 5a of the disc 5 of the concave 22. The window 23 is closed with the protection plate 24 made of the material less in the absorption of laser light and air-tightness is held. The lower and upper covers 10a, 10b have the construction that they are inserted to the open ends and the packing 25 is inserted on the mating surfaces. The enclosed case 10 containing the disc 5 is ensured for air-tightness. Thus, the information processing with higher accuracy can be made.
JP9552179A 1979-07-26 1979-07-26 Memory unit of optical disc Pending JPS5619567A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9552179A JPS5619567A (en) 1979-07-26 1979-07-26 Memory unit of optical disc

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9552179A JPS5619567A (en) 1979-07-26 1979-07-26 Memory unit of optical disc

Publications (1)

Publication Number Publication Date
JPS5619567A true JPS5619567A (en) 1981-02-24

Family

ID=14139860

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9552179A Pending JPS5619567A (en) 1979-07-26 1979-07-26 Memory unit of optical disc

Country Status (1)

Country Link
JP (1) JPS5619567A (en)

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