JPS54131905A - Production of high density recording media - Google Patents

Production of high density recording media

Info

Publication number
JPS54131905A
JPS54131905A JP3959778A JP3959778A JPS54131905A JP S54131905 A JPS54131905 A JP S54131905A JP 3959778 A JP3959778 A JP 3959778A JP 3959778 A JP3959778 A JP 3959778A JP S54131905 A JPS54131905 A JP S54131905A
Authority
JP
Japan
Prior art keywords
mold
thin film
original disc
high density
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.)
Granted
Application number
JP3959778A
Other languages
Japanese (ja)
Other versions
JPS6049978B2 (en
Inventor
Shoji Itoya
Mitsuo Kaneuchi
Kazuo Hirasawa
Masakado Nakada
Kuniaki Sakai
Toshio Yada
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.)
TOKYO DENKA KK
Teac Corp
Mitsubishi Electric Corp
Original Assignee
TOKYO DENKA KK
Teac Corp
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 TOKYO DENKA KK, Teac Corp, Mitsubishi Electric Corp filed Critical TOKYO DENKA KK
Priority to JP3959778A priority Critical patent/JPS6049978B2/en
Publication of JPS54131905A publication Critical patent/JPS54131905A/en
Publication of JPS6049978B2 publication Critical patent/JPS6049978B2/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/0057—Intermediate mediums, i.e. mediums provided with an information structure not specific to the method of reproducing or duplication such as matrixes for mechanical pressing of an information structure ; record carriers having a relief information structure provided with or included in layers not specific for a single reproducing method; apparatus or processes specially adapted for their manufacture

Landscapes

  • Moulds For Moulding Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Manufacturing Optical Record Carriers (AREA)

Abstract

PURPOSE:To obtain an accurate duplicate mold by applying electrolytic plating directly to an original disc with the metal thin film of the original disc as an electrode in volume production of high density records for recording and reproducing of PCM audio signal. CONSTITUTION:After filming treatment on thin film 2 surface has been applied with acid and alkali solutions to an original disc having the metal thin film of around 0.1 mm in thickness engraved with bits 3 corresponding to information on a glass substrate 1, electrolytic plating of metals such as Ni is applied to a thickness of about 100mum with the thin film 2 as an electrode. Thereafter, the Ni disc having been plated is peeled from the original disc, whereby the first mold is obtained. Further, a second mold is made from the first mold and a third mold from the second mold by similar techniques. Through pressing process using this third mold, the high density recording records of less noise faithful to the original disc are volume-produced.
JP3959778A 1978-04-04 1978-04-04 Method for manufacturing high-density recording carrier Expired JPS6049978B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3959778A JPS6049978B2 (en) 1978-04-04 1978-04-04 Method for manufacturing high-density recording carrier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3959778A JPS6049978B2 (en) 1978-04-04 1978-04-04 Method for manufacturing high-density recording carrier

Publications (2)

Publication Number Publication Date
JPS54131905A true JPS54131905A (en) 1979-10-13
JPS6049978B2 JPS6049978B2 (en) 1985-11-06

Family

ID=12557510

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3959778A Expired JPS6049978B2 (en) 1978-04-04 1978-04-04 Method for manufacturing high-density recording carrier

Country Status (1)

Country Link
JP (1) JPS6049978B2 (en)

Also Published As

Publication number Publication date
JPS6049978B2 (en) 1985-11-06

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