GB405541A - Improved method of manufacturing gramophone discs - Google Patents

Improved method of manufacturing gramophone discs

Info

Publication number
GB405541A
GB405541A GB18958/33A GB1895833A GB405541A GB 405541 A GB405541 A GB 405541A GB 18958/33 A GB18958/33 A GB 18958/33A GB 1895833 A GB1895833 A GB 1895833A GB 405541 A GB405541 A GB 405541A
Authority
GB
United Kingdom
Prior art keywords
disc
gramophone
manufacturing
improved method
july
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
Application number
GB18958/33A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB405541A publication Critical patent/GB405541A/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
    • G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • G11B3/68—Record carriers
    • G11B3/70—Record carriers characterised by the selection of material or structure; Processes or apparatus specially adapted for manufacturing record carriers

Landscapes

  • Manufacturing Optical Record Carriers (AREA)

Abstract

405,541. Gramophone records. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN, Emmasingel, Eindhoven, Holland. July 4, 1933, No. 18958. Convention date, July 7, 1932. [Class 40 (ii).] " Home recording " on a gramophone disc is effected by using a disc of aluminium, consisting of a single layer, the disc being transformed either entirely or only at its surface, after engraving with a stylus, into a chemical compound which is harder than the original metal. The hardening, which is preferably superficial and is preferably effected by electrolytic oxidation, may be done by hanging the disc in a bath of oxalic acid which is electrolyzed with the disc as the anode. The metal may thus be oxidized to any desired thickness.
GB18958/33A 1932-07-07 1933-07-04 Improved method of manufacturing gramophone discs Expired GB405541A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE405541X 1932-07-07

Publications (1)

Publication Number Publication Date
GB405541A true GB405541A (en) 1934-02-08

Family

ID=6421944

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18958/33A Expired GB405541A (en) 1932-07-07 1933-07-04 Improved method of manufacturing gramophone discs

Country Status (1)

Country Link
GB (1) GB405541A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2519488A (en) * 1945-02-26 1950-08-22 Edward L Mack Sound reproducing stylus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2519488A (en) * 1945-02-26 1950-08-22 Edward L Mack Sound reproducing stylus

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