PL34476B1 - The method of imparting electrical transparency to the surfaces of wax matrices for the production of gramophone records - Google Patents
The method of imparting electrical transparency to the surfaces of wax matrices for the production of gramophone records Download PDFInfo
- Publication number
- PL34476B1 PL34476B1 PL34476A PL3447643A PL34476B1 PL 34476 B1 PL34476 B1 PL 34476B1 PL 34476 A PL34476 A PL 34476A PL 3447643 A PL3447643 A PL 3447643A PL 34476 B1 PL34476 B1 PL 34476B1
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- PL
- Poland
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- production
- imparting electrical
- gramophone records
- wax matrices
- matrices
- Prior art date
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Description
Przy wytwarzaniu plyt gramofonowych pow¬ staja trudnosci przy nadawaniu przewodnosci elektrycznej powierzchni matrycy woskowej.Sposoby chemiczne, na przyklad posrebrzanie, nie daja zadowalajacych wyników, gdyz war¬ stwa metalowa nie trzyma sie dostatecznie po¬ wierzchni woskowej. Katodowe rozpylanie po¬ woduje ogrzewanie matrycy woskowej, wskutek czego latwo moze nastapic jej uszkodzenie.Glówna niedogodnosc ogólnie stosowanego spo¬ sobu grafitowania polega na ziarnistosci rowków, co powoduje szmery przy odgrywaniu plyty.Celem wynalazku jest unikniecie tych nie¬ dogodnosci. Wedlug wynalazku powierzchnie matrycy czyni sie przewodzaca elektrycznie przez powleczenie jej warstwa metalowa otrzy¬ mywana przez odparowywanie metalu w wyso¬ kiej prózni w granicach okolo 10-3 — 10-6 mm slupa rteci, np. warstwa srebra, zlota, miedzi lub innego metalu lub stopu nisko wrzacego.Wybiera sie taki metal, aby dalsze galwaniczne nanoszenie, np. miedzi, odbywalo sie bez trud¬ nosci. Osadzona przez odparowywanie w wyso¬ kiej prózni warstwa metalowa, trzyma sie dos¬ konale powierzchni matrycy woskowej i pozwa¬ la na odtwarzanie matrycy woskowej bez nie¬ dogodnosci dotychczasowych sposobów. PLDifficulties in imparting an electrical conductivity to the surface of the wax matrix arise in the manufacture of gramophone records. Chemical methods, for example silver plating, do not give satisfactory results because the metal layer does not sufficiently adhere to the wax surface. The cathodic sputtering heats the wax matrix, which can easily damage it. The main drawback of the generally used graphitizing method is the granularity of the grooves, which causes noises when the plate is played. According to the invention, the surfaces of the matrix are made electrically conductive by coating it with a metal layer obtained by evaporating the metal in a high vacuum in the range of about 10-3-10-6 mm of mercury, e.g. a layer of silver, gold, copper or other metal or A metal is chosen such that further electroplating of, for example, copper is carried out without difficulty. The metal layer deposited by high-vacuum evaporation adheres perfectly to the surface of the wax matrix and allows the reconstruction of the wax matrix without the inconvenience of the prior art methods. PL
Claims (1)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| PL34476B1 true PL34476B1 (en) | 1951-06-30 |
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