US3749828A - Method for improving the centering of stamping matrices for sound and video discs - Google Patents

Method for improving the centering of stamping matrices for sound and video discs Download PDF

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Publication number
US3749828A
US3749828A US00201380A US3749828DA US3749828A US 3749828 A US3749828 A US 3749828A US 00201380 A US00201380 A US 00201380A US 3749828D A US3749828D A US 3749828DA US 3749828 A US3749828 A US 3749828A
Authority
US
United States
Prior art keywords
centering
negative
foil
lacquer foil
lacquer
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.)
Expired - Lifetime
Application number
US00201380A
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English (en)
Inventor
W Rohwer
H Knothe
K Roschmann
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.)
TELDEC Telefunken Decca Schallplatten GmbH
Original Assignee
TELDEC Telefunken Decca Schallplatten GmbH
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 Schallplatten GmbH filed Critical TELDEC Telefunken Decca Schallplatten GmbH
Application granted granted Critical
Publication of US3749828A publication Critical patent/US3749828A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • ABSTRACT The care and accuracy of centering the negative, e.g. the master or stamping matrix, used in the production of sound and video record discs is improved by preparing the original lacquer foil record so that the negative will have a profile which extends ccntrically to the record groove spiral. This is accomplished by inserting a centering core, which is adapted to the spindle of the playback system and has a laterally extending flange defining a galvanically reproducible centering edge, into a centering hole in the foil prior to the cutting of the spiral groove containing the recorded information into the lacquer foil.
  • a centering core which is adapted to the spindle of the playback system and has a laterally extending flange defining a galvanically reproducible centering edge
  • the present invention relates to the centering of stamping matrices for pressing record discs containing sound and video recordings. More particularly, the present invention relates to an improved method of manufacturing phonograph records whereby the ease of centering and the centering accuracy of the stamping matrix is improved.
  • stamping matrices which have been produced by galvanic means, either directly or indirectly, from an original into a special die in which the matrices are centered with regard to the spiral groove thereon by means of a measuring device which usually comprises a microscope.
  • the stamping matrices are then provided, in the aligned position, with a centric center hole which accommodates a holding device in the pressing mold.
  • the use of the center hole as the sole centering means for the matrices is often unsuitable since frequent changing can cause the center hole to become noncircular.
  • Another known method of centering the stamping matrix is to align same according to the concentric trailing groove thereon.
  • the accuracy of the centering is improved since it is not necessary, as in the first method, to compensate intuitively for the spiral shape of the groove.
  • the lacquer foil original produced in this manner is then made conductive by metallizing the lacquer foil through electrolysis. After this process step a hollow centering core is inserted into the bore with as little play as possible and a negative, Le, a master or a stamping matrix respectively, is then made galvanically or chemically in a well known manner.
  • the present invention now relates to a centering method which permits more accurate centering of the stamping matrices than was heretofore possible with the known methods in that before the cutting of the spiral groove, the lacquer foil is prepared so that the negatives, i.e., the masters or stamping matrices, respectively, are provided with a profile which extends centrically to the groove spiral and which simultaneously serves to hold the negatives in the pressing mold.
  • the desired profile for the negatives is provided in a galvanoplastic manner.
  • the lacquer foil used to produce the original is initially provided with a central hole, a hollow centering core, which is adapted to the takeup pin of the playback system and is provided with a laterally extending galvanically reproduceable centering edge, is inserted into the central hole of the lacquer foil.
  • the lacquer foil with the centering core is then placed on the recording machine and a groove spiral containing the recorded information is cut into the lacquer foil, and thereafter, in a known manner, a negative, i.e., a master or a stamping matrix, respectively, is obtained from the lacquer foil either chemically or galvanoplastically.
  • FIGURE is a sectional view of a lacquer foil provided with a centering core according to the method of the invention.
  • a lacquer foil 1 which is provided with a central hole 2.
  • a hollow core 3 having a bore 4 and a laterally extending flange 5, the edge of which forms a galvanically reproducible centering edge 5', is inserted into the central hole 2.
  • the bore 4 must be concentric with the centering edge 5 and must fit on the takeup pin or spindle 6 of the cutting or recording machine (not shown) with the least possible amount of play so that as little eccentricity as possible is produced for the groove sprial 7 with respect to the centering edge 5' during subsequent cutting of the groove spiral 7.
  • a negative thereof i.e., a master or a stamping matrix, respectively, are produced from the lacquer foil in a known manner either galvanically or chemically.
  • the hollow centering core 3 is inserted into the uncut lacquer foil 1 in any suitable desired manner, for example, by screwing or gluing.
  • the size or accurate position of the central hole 2 in the lacquer foil 1 now plays only a subordinate role, i.e., it now serves only to hold the hollow centering core 3.
  • the fitting hole or bore 4 of the core 3 which extends concentrically to the centering edge 5' and which is adapted to the takeup pin or spindle of the playback apparatus is used for the cutting process.
  • the diameter of the bore 4 corresponds to the diameter of spindle of the playback system.
  • the use of the method according to the invention results in far fewer error possibilities than was possible in the methods according to the prior art since the core 3 remains in the foil 1 during all of the subsequent galvanic processes.
  • the hollow centering core 3 is cleaned together with the lacquer foil 1 and prepared for the reduction silver plating.
  • lacquer foil 1 and the hollow centering core 3 constitute a single unit, care must be taken that the lacquer foil 1 and the hollow centering core 3, which is predominantly made of refined steel, are simultaneously cleaned and sensitized in such a manner that a finegrained ductile metal layer can be chemically deposited in order to form the negative.
  • the cleaning and sensitizing of these different materials is advisably effected in a single bath which is geared in its composition to the properties and the type of soiling of the two materials.
  • the cleaning and sensitizing can additionally be done untrasonically so that with a change in the rotational speed (convection) of the lacquer foil 1 in thee cleansing bath, the cavitation hardness can be set in dependence on the degree of soiling of the lacquer foil and the core. It is moreover advisable to provide the bath with a continuous filtration system in order to remove ejected dirt particles immediately.
  • composition of a cleaning bath which may be used to simultaneously clean the foil 1 and the core 4 may comprise, for example, a solution of tinchloride, hydrochloric acid, grape sugar and saponine.
  • the lacquer foil 1 and core 4 remains for example, in such a cleaning bath for about 2 minutes.
  • the method for producing negatives for the manufacture of video or sound record discs as defined in claim 1 including the step of simultaneously cleansing and sensitizing the lacquer foil and centering core in a combined bath after the step of cutting of a spiral groove and prior to thee step of forming the negative.
  • a method for producing a negative from a lacquer foil original recording for the manufacture of record discs containing sound or video recordings wherein the negative, i.e., a master or a stamping matrix, is formed from the lacquer foil original recording, in a known manner, either chemically or galvanically
  • the improvement comprising the steps of: providing the lacquer foil with a centering hole; providing a hollow centering core having an inner diameter which corresponds to the diameter of the spindle of the playback system and a laterally extending flange defining a concentric galvanically reproducible centering edge; inserting the centering core into the centering hole with the flange extending along the surface of the lacquer foil on which the recording is to be made; cutting a groove spiral containing the recording into the lacquer foil; and then forming the negative from the original, whereby the negative will include the profile of the laterally extending flange which profile can then be used to center the negative during subsequent processing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Chemically Coating (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
US00201380A 1970-11-23 1971-11-23 Method for improving the centering of stamping matrices for sound and video discs Expired - Lifetime US3749828A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2057478A DE2057478C3 (de) 1970-11-23 1970-11-23 Verfahren zur Herstellung von zentrierten Pressmatrizen fur Schall platten und Videoplatten

Publications (1)

Publication Number Publication Date
US3749828A true US3749828A (en) 1973-07-31

Family

ID=5788855

Family Applications (1)

Application Number Title Priority Date Filing Date
US00201380A Expired - Lifetime US3749828A (en) 1970-11-23 1971-11-23 Method for improving the centering of stamping matrices for sound and video discs

Country Status (11)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4198871A (en) * 1978-02-23 1980-04-22 Mfe Corporation Transducer positioning apparatus
EP0047645A1 (de) * 1980-09-05 1982-03-17 Matsushita Electric Industrial Co., Ltd. Verfahren zum Herstellen einer Datenträgerplatte

Citations (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

Patent Citations (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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Audio Cyclopedia, 1969, p. 655, 659, 660, 671, relevant to centering lacquer foil originals. *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4198871A (en) * 1978-02-23 1980-04-22 Mfe Corporation Transducer positioning apparatus
EP0047645A1 (de) * 1980-09-05 1982-03-17 Matsushita Electric Industrial Co., Ltd. Verfahren zum Herstellen einer Datenträgerplatte
US4472124A (en) * 1980-09-05 1984-09-18 Matsushita Electric Industrial Co., Limited Device for producing an information recording disk

Also Published As

Publication number Publication date
BE775667A (fr) 1972-03-16
CH544986A (de) 1973-11-30
DE2057478B2 (de) 1973-04-05
GB1367798A (en) 1974-09-25
FR2115346A1 (de) 1972-07-07
DE2057478A1 (de) 1972-06-08
DE2057478C3 (de) 1973-10-25
JPS5426881B1 (de) 1979-09-06
AT320306B (de) 1975-02-10
IT939167B (it) 1973-02-10
NL7115842A (de) 1972-05-25
SE365745B (de) 1974-04-01
FR2115346B1 (de) 1976-02-13

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