IT939167B - PROCEDURE FOR CENTERING MOLDING MATRICES FOR AUDIO AND VIDEO DISCS - Google Patents

PROCEDURE FOR CENTERING MOLDING MATRICES FOR AUDIO AND VIDEO DISCS

Info

Publication number
IT939167B
IT939167B IT30891/71A IT3089171A IT939167B IT 939167 B IT939167 B IT 939167B IT 30891/71 A IT30891/71 A IT 30891/71A IT 3089171 A IT3089171 A IT 3089171A IT 939167 B IT939167 B IT 939167B
Authority
IT
Italy
Prior art keywords
audio
procedure
video discs
molding matrices
centering
Prior art date
Application number
IT30891/71A
Other languages
Italian (it)
Original Assignee
Teldec Telefunken Decca
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 Teldec Telefunken Decca filed Critical Teldec Telefunken Decca
Application granted granted Critical
Publication of IT939167B publication Critical patent/IT939167B/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2017/00—Carriers for sound or information
    • B29L2017/001—Carriers of records containing fine grooves or impressions, e.g. disc records for needle playback, cylinder records
    • B29L2017/003—Records or discs

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemically Coating (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)
IT30891/71A 1970-11-23 1971-11-09 PROCEDURE FOR CENTERING MOLDING MATRICES FOR AUDIO AND VIDEO DISCS IT939167B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2057478A DE2057478C3 (en) 1970-11-23 1970-11-23 Process for the production of centered press dies for records and video discs

Publications (1)

Publication Number Publication Date
IT939167B true IT939167B (en) 1973-02-10

Family

ID=5788855

Family Applications (1)

Application Number Title Priority Date Filing Date
IT30891/71A IT939167B (en) 1970-11-23 1971-11-09 PROCEDURE FOR CENTERING MOLDING MATRICES FOR AUDIO AND VIDEO DISCS

Country Status (11)

Country Link
US (1) US3749828A (en)
JP (1) JPS5426881B1 (en)
AT (1) AT320306B (en)
BE (1) BE775667A (en)
CH (1) CH544986A (en)
DE (1) DE2057478C3 (en)
FR (1) FR2115346B1 (en)
GB (1) GB1367798A (en)
IT (1) IT939167B (en)
NL (1) NL7115842A (en)
SE (1) SE365745B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2807856A1 (en) * 1978-02-23 1979-09-06 Mfe Corp POSITIONING DEVICE
DE3167483D1 (en) * 1980-09-05 1985-01-10 Matsushita Electric Ind Co Ltd A method of producing an information recording disk

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1253374A (en) * 1916-08-21 1918-01-15 Bertram M Hansen Centering means for phonographic records and the like.
US1755743A (en) * 1928-11-02 1930-04-22 Edgar H Morrison Phonograph disk record

Also Published As

Publication number Publication date
US3749828A (en) 1973-07-31
NL7115842A (en) 1972-05-25
AT320306B (en) 1975-02-10
SE365745B (en) 1974-04-01
DE2057478A1 (en) 1972-06-08
FR2115346A1 (en) 1972-07-07
BE775667A (en) 1972-03-16
GB1367798A (en) 1974-09-25
CH544986A (en) 1973-11-30
DE2057478C3 (en) 1973-10-25
JPS5426881B1 (en) 1979-09-06
FR2115346B1 (en) 1976-02-13
DE2057478B2 (en) 1973-04-05

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