US1448792A - Method of making master phonograph records - Google Patents

Method of making master phonograph records Download PDF

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Publication number
US1448792A
US1448792A US491111A US49111121A US1448792A US 1448792 A US1448792 A US 1448792A US 491111 A US491111 A US 491111A US 49111121 A US49111121 A US 49111121A US 1448792 A US1448792 A US 1448792A
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silver
record
wax
solution
metal
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Expired - Lifetime
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US491111A
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William H Cole
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    • 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

Definitions

  • the principal object-s of the present invention are ⁇ first, to simplify the processor method of producing master record-s by reducing thenulnber of steps involved; second, to produce an improved and more accurate master record; and third, to produce the master record direct from the wax record.
  • Other objects of the invention will appear from the following description and the invention will be pointed out and claimed at'the end hereof.
  • metal is deposited by precipitation from solution distributed upon the Wax or like record by the action of alcohol, and one or more of the same or of different kinds of metal are electro-plated upon the metal first deposited from solution, so that the removal of .the wax exposes the metal first deposited from solution, and this metal exactly and faithfully 'conforms to the grooves in the wax record with which it directly contacted; accordingly my invention comprises the process above outlined.
  • Fig. 5 similarly .represents the master 40 record.
  • the wax record 3 is made in the usual or 'in any preferred way.
  • An ammonical silver solution is made ⁇ for example. by dissolving silver nitrate i'n aqua ammonia and this solution along with alcohol is applied to the face of the wax record. From this'solution silver is deposited as at 5 by means of an aldehyde, preferably formaldehyde.
  • the alcohol plays an important part in that it insures proper distribution of the solution of silver salts over the surface of the wax.
  • This deposit 5 is electro-plated with a coating or layer of metal 6, in the present instance silver, so that the deposit from solution and the electroplating 6 of silver thereon together constitute a layer of silver, and upon this composite layer of silver is electroplated copper 7.
  • the finished product is shown in F ig. 5, in which 1 is silver and 2 is copper and the exposed face of the silver 1 is the deposit from the solution, Fig. 2, which was in direct contact with the face 3 of the wax record 4, and therefore it faithfully and accurately corresponds with that face.
  • the method of making master records from wax and like records ⁇ which consists in depositing silver directly onto and in contact with the face of the wax record by applying an admixture of alcohol and a solution of nitrate of silver in aqua ammonia to the face of the wax record and precipitating silver therefrom by formaldehyde. electroplating silver upon the silver deposited from solution, and electro-plating copper upon the electro-phtml silver, substantially as described.

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  • Other Surface Treatments For Metallic Materials (AREA)
  • Electroplating And Plating Baths Therefor (AREA)
  • Chemically Coating (AREA)

Description

Patented Mar. 20, 1923.
UNITED STATES PATENT METHOD F MAKING MASTER PHONOGRAPH RECORDS.
Application filed August 10, 1921. Serial No. 491,111.
To all whom, t may Concern Be it known that I, WILLIAM H. COLE,
a citizen of the United States, residing at Newark, in the county of Essex and State of New Jersey, have invented a certa-in new and useful Method of Making Master Phonograph Records, of which the following is a specification.
The principal object-s of the present invention are` first, to simplify the processor method of producing master record-s by reducing thenulnber of steps involved; second, to produce an improved and more accurate master record; and third, to produce the master record direct from the wax record. Other objects of the invention will appear from the following description and the invention will be pointed out and claimed at'the end hereof.
In the practice of my invention metal is deposited by precipitation from solution distributed upon the Wax or like record by the action of alcohol, and one or more of the same or of different kinds of metal are electro-plated upon the metal first deposited from solution, so that the removal of .the wax exposes the metal first deposited from solution, and this metal exactly and faithfully 'conforms to the grooves in the wax record with which it directly contacted; accordingly my invention comprises the process above outlined.
In additionally describing the invention reference will be made to the accompanying r drawings in which- Figures l. 2, 3 and 4. dia-gra-mmatically and schematically represent steps into which the process may be divided, and
Fig. 5 similarly .represents the master 40 record.
In connection with the drawings it will be assumed that the face 1, ofthe master record is of silver and that the back 2 of the master record is of copper. The backing as of loaden material usually applied to the copper 2 is not shown. I will now describe thc manufacture of such a silver faced copper hacked master record by the process of this invention.
The wax record 3 is made in the usual or 'in any preferred way. An ammonical silver solution is made` for example. by dissolving silver nitrate i'n aqua ammonia and this solution along with alcohol is applied to the face of the wax record. From this'solution silver is deposited as at 5 by means of an aldehyde, preferably formaldehyde. The alcohol plays an important part in that it insures proper distribution of the solution of silver salts over the surface of the wax. This deposit 5 is electro-plated with a coating or layer of metal 6, in the present instance silver, so that the deposit from solution and the electroplating 6 of silver thereon together constitute a layer of silver, and upon this composite layer of silver is electroplated copper 7. The finished product is shown in F ig. 5, in which 1 is silver and 2 is copper and the exposed face of the silver 1 is the deposit from the solution, Fig. 2, which was in direct contact with the face 3 of the wax record 4, and therefore it faithfully and accurately corresponds with that face.
The invention being chemical and electrochemical in its nature, I reserve the benefit of the doctrine of equivalents allowed in such cases.
I claim:
1. The method of making master records from wax and like records, which consists in depositing metal directly onto and in contact with the `face of the wax record by applying an admixture of a solution of salts of the metal and alcohol to the surfacel of the record and precipitating the metal therefrom, and then electro-depositing metal upon the metal first deposited from solution. substantially as described.
2. The method of making master records from wax and like records` which consists in depositing silver directly onto and in contact with the face of the wax record by applying an admixture of alcohol and a solution of nitrate of silver in aqua ammonia to the face of the wax record and precipitating silver therefrom by formaldehyde. electroplating silver upon the silver deposited from solution, and electro-plating copper upon the electro-phtml silver, substantially as described.
3. In the method of making master records from wax and the like the improvement which consists in depositing metal directly onto and in contact with the surface 0f the wax record by precipitating it from a solution containing alcohol. and then applying additional metal to the back of said deposit which latter becomes the face of the master record,
WILLIAM H. COLE.
US491111A 1921-08-10 1921-08-10 Method of making master phonograph records Expired - Lifetime US1448792A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2430581A (en) * 1944-11-29 1947-11-11 Rca Corp Metallizing nonmetallic bodies
US3875024A (en) * 1973-06-29 1975-04-01 Thomas Brandt Method of manufacturing a master designed for the reproduction of records readable optically by diffraction

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2430581A (en) * 1944-11-29 1947-11-11 Rca Corp Metallizing nonmetallic bodies
US3875024A (en) * 1973-06-29 1975-04-01 Thomas Brandt Method of manufacturing a master designed for the reproduction of records readable optically by diffraction

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