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JPS5690437A - Optical disc - Google Patents

Optical disc

Info

Publication number
JPS5690437A
JPS5690437A JP16406179A JP16406179A JPS5690437A JP S5690437 A JPS5690437 A JP S5690437A JP 16406179 A JP16406179 A JP 16406179A JP 16406179 A JP16406179 A JP 16406179A JP S5690437 A JPS5690437 A JP S5690437A
Authority
JP
Japan
Prior art keywords
reflection factor
pit
optical disc
level
reflection
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
JP16406179A
Other languages
Japanese (ja)
Inventor
Takeshi Maeda
Keizo Kato
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP16406179A priority Critical patent/JPS5690437A/en
Publication of JPS5690437A publication Critical patent/JPS5690437A/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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
    • G11B7/24085—Pits

Landscapes

  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

PURPOSE:To enable to distinguish address information and additional information from each other easily by the signal amplitude level, by making the optical disc to have a strucdure, where metallic films different in reflection factor are piled on the substrate. CONSTITUTION:The optical disc is formed by vapor depositing or coating with the metallic thin film 4 on the substrate 1, (h) indicates the depth of pit 3' formed in address part I, and 6' indicates the pit formed in additional recording part II. Metallic materials are used in which reflection factor T4 of upper-layer metallic film 4 of the optical disc is larger than reflection facdor T5 of lower-layer metallic film 5. With such structure, detection signal 11 due to the reflection light for passage through pit 3' is based on the phase type of depth (h), the level of the signal becomes smaller than the level of reflection factor T4 and becomes the level of reflection factor T6; and contrarily, in the variable density type, a signal increased from reflection factor T5 to reflection factor T4 in the position of pit 6' is obtained.
JP16406179A 1979-12-19 1979-12-19 Optical disc Pending JPS5690437A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16406179A JPS5690437A (en) 1979-12-19 1979-12-19 Optical disc

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16406179A JPS5690437A (en) 1979-12-19 1979-12-19 Optical disc

Publications (1)

Publication Number Publication Date
JPS5690437A true JPS5690437A (en) 1981-07-22

Family

ID=15786031

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16406179A Pending JPS5690437A (en) 1979-12-19 1979-12-19 Optical disc

Country Status (1)

Country Link
JP (1) JPS5690437A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0100995A2 (en) * 1982-08-10 1984-02-22 Kabushiki Kaisha Toshiba Optical disk
EP0288140A2 (en) * 1987-02-26 1988-10-26 Plasmon Plc Improvements relating to the formatting of optical data storage members
US5220556A (en) * 1989-10-27 1993-06-15 Ricoh Company, Ltd. Optical disk with identification phase-encoded area

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5346019A (en) * 1976-10-08 1978-04-25 Canon Inc Recoading medium

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5346019A (en) * 1976-10-08 1978-04-25 Canon Inc Recoading medium

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0100995A2 (en) * 1982-08-10 1984-02-22 Kabushiki Kaisha Toshiba Optical disk
US4587648A (en) * 1982-08-10 1986-05-06 Tokyo Shibaura Denki Kabushiki Kaisha Optical disk
EP0288140A2 (en) * 1987-02-26 1988-10-26 Plasmon Plc Improvements relating to the formatting of optical data storage members
US5220556A (en) * 1989-10-27 1993-06-15 Ricoh Company, Ltd. Optical disk with identification phase-encoded area

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