JPS56140536A - Optical video disk using ferromagnetic metal as reflecting film - Google Patents

Optical video disk using ferromagnetic metal as reflecting film

Info

Publication number
JPS56140536A
JPS56140536A JP4315480A JP4315480A JPS56140536A JP S56140536 A JPS56140536 A JP S56140536A JP 4315480 A JP4315480 A JP 4315480A JP 4315480 A JP4315480 A JP 4315480A JP S56140536 A JPS56140536 A JP S56140536A
Authority
JP
Japan
Prior art keywords
ferromagnetic metal
reflecting film
reproduction
disk
pits
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
JP4315480A
Other languages
Japanese (ja)
Inventor
Osamu Kumasaka
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.)
Pioneer Corp
Original Assignee
Pioneer Electronic 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 Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Priority to JP4315480A priority Critical patent/JPS56140536A/en
Publication of JPS56140536A publication Critical patent/JPS56140536A/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
    • G11B13/00—Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for
    • G11B13/04—Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for magnetically or by magnetisation and optically or by radiation, for changing or sensing optical properties

Landscapes

  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

PURPOSE:To enable to make magnetic recording and reproduction in addition to optical reproduction, by forming a reflecting film layer, made of a ferromagnetic metal, on the main surface of a discoid subtrate where pits having information recorded are formed. CONSTITUTION:On the signal surface of substrate 1 to which pits in the signal recording surface of an original disk have been transferred, reflecting film 2 made of a ferromagnetic metal is provided by sputtering and on it, protection layer 3 is further provided. Two disks consisting of those three layers are stucked to each other with protection layers 3 inside to form a both-sided preproduction type disk. This disk is irradiated with a reading light beam at the side of substrate 1 and reflected light from reflecding film 2 is detected for optical signal reproduction. Further, reflecting film 2 of this ferromagnetic metal is magnetized by using a means, such as magnetic head, to perform magnetic recording and reproduction.
JP4315480A 1980-04-02 1980-04-02 Optical video disk using ferromagnetic metal as reflecting film Pending JPS56140536A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4315480A JPS56140536A (en) 1980-04-02 1980-04-02 Optical video disk using ferromagnetic metal as reflecting film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4315480A JPS56140536A (en) 1980-04-02 1980-04-02 Optical video disk using ferromagnetic metal as reflecting film

Publications (1)

Publication Number Publication Date
JPS56140536A true JPS56140536A (en) 1981-11-02

Family

ID=12655926

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4315480A Pending JPS56140536A (en) 1980-04-02 1980-04-02 Optical video disk using ferromagnetic metal as reflecting film

Country Status (1)

Country Link
JP (1) JPS56140536A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03168951A (en) * 1989-11-27 1991-07-22 Sharp Corp Optical recording medium
US5463609A (en) * 1992-10-23 1995-10-31 Matsushita Electric Industrial Co., Ltd. Information recording and reproducing device and a method using the same
US5674583A (en) * 1989-11-22 1997-10-07 Sharp Kabushiki Kaisha Optical recording medium and manufacturing method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4948978A (en) * 1972-09-13 1974-05-11
JPS53117402A (en) * 1977-03-23 1978-10-13 Mitsubishi Electric Corp Video disc

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4948978A (en) * 1972-09-13 1974-05-11
JPS53117402A (en) * 1977-03-23 1978-10-13 Mitsubishi Electric Corp Video disc

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5674583A (en) * 1989-11-22 1997-10-07 Sharp Kabushiki Kaisha Optical recording medium and manufacturing method thereof
US5989671A (en) * 1989-11-22 1999-11-23 Sharp Kabushiki Kaisha Optical recording medium and manufacturing method thereof
JPH03168951A (en) * 1989-11-27 1991-07-22 Sharp Corp Optical recording medium
US5463609A (en) * 1992-10-23 1995-10-31 Matsushita Electric Industrial Co., Ltd. Information recording and reproducing device and a method using the same
US5577016A (en) * 1992-10-23 1996-11-19 Matsushita Electric Industrial Co., Ltd. Recording medium having concavo-convex pits with a maximum and a minimum pit depth depending on the wavelength of a laser light
US5602819A (en) * 1992-10-23 1997-02-11 Matsushita Electric Industrial Co., Ltd. Optical information system to detect reflection of pit depth by evanescent wave

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