DE535972C - Microphone contact body with hard carbon coating - Google Patents
Microphone contact body with hard carbon coatingInfo
- Publication number
- DE535972C DE535972C DES73007D DES0073007D DE535972C DE 535972 C DE535972 C DE 535972C DE S73007 D DES73007 D DE S73007D DE S0073007 D DES0073007 D DE S0073007D DE 535972 C DE535972 C DE 535972C
- Authority
- DE
- Germany
- Prior art keywords
- carbon coating
- hard carbon
- contact body
- microphone contact
- microphones
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R21/00—Variable-resistance transducers
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Laminated Bodies (AREA)
Description
Mikrophonischer Kontaktkörper tnit Hartkohleüberzug Die aus Metallen oder gewöhnlicher Kohle hergestellten Kontaktkörper für Mikrophone, die mechanischen Kontakt miteinander bilden, zeigen den Nachteil, daß sie an den Berührungsstellen infolge mechanischer Einflüsse oder durch Erwärmung (z. B. infolge Funkenbildung) leicht Beschädigungen oder Verunreinigungen erleiden, durch die sie nach einer gewissen Zeit unbrauchbar werden.Microphone contact body with hard carbon coating Die made of metals or ordinary carbon-made contact bodies for microphones, the mechanical ones Form contact with each other, show the disadvantage that they are at the points of contact as a result of mechanical influences or heating (e.g. as a result of sparking) easily suffer damage or contamination through which they after a certain amount of time Time to become unusable.
Es ist bereits bekannt, Metalle als mikrophonische Kontaktkörper zu verwenden, die mit einem Überzug von Hartkohle versehen sind, der durch Überleiten eines Kohlenwasserstoffes über die erhitzten Teilchen hergestellt wird. Bei der Anwendung dieses bekannten Herstellungsverfahrens auf die Kontaktmaterialien für Mikrophone läßt sich die für die Wirkungsweise des Mikrophons wichtige Güte und Stärke des Überzuges nicht vorher festlegen, so daß eine einwandfreie Fertigung und die Herstellung einer größeren Anzahl von Mikrophonen gleicher Güte und gleicher Eigenschaften durch die Anwendung der bekannten Verfahren nicht möglich ist.It is already known to use metals as microphonic contact bodies use, which are provided with a coating of hard carbon, which by passing over of a hydrocarbon is produced via the heated particles. In the Application of this known manufacturing process to the contact materials for Microphones can be the quality and important for the mode of operation of the microphone Do not specify the thickness of the coating beforehand, so that a perfect production and the manufacture of a greater number of microphones of the same quality and of the same type Properties through the application of the known method is not possible.
Gemäß der Erfindung ;wird ein mikrophonischer Kontaktkörper mit Hartkohleüberzug dadurch hergestellt, daß'zur Erzielung bestimmter Härte und Stärke des Kohleüberzuges das Verfahren nach Patent 438 429 Anwendung findet. Diese Hartkohle, die vorzugsweise durch Überleiten von Kohlenwasserstoff über die erhitzten Trägerstoffe (Metall, Porzellan, Kohle usw.) unter Luftabschluß und zweckmäßig bei beträchtlichem Unterdruck erhalten wird, ist gegenüber mechanischen und elektrischen Einflüssen fastunangreifbar, gewährleistet die größte Haltbarkeit und Zuverlässigkeit der Mikrophone und setzt das so lästige Rauschen der Mikrophone auf einen sehr geringen Betrag herab. Außerdem wird auf diese Weise erst die serienmäßige Herstellung von Qualitätsmikrophonen gleicher Güte und gleicher Eigenschaften sichergestellt, deren elektrische und akustische Eigenschaften sich im voraus genau festlegen lassen, da nach dem neuen Verfahren der Hartkohleüberzug nach Härte und Stärke genau festgelegt werden kann.According to the invention there is a microphonic contact body with a hard carbon coating produced in that to achieve a certain hardness and strength of the carbon coating the method of patent 438,429 is used. This hard coal that preferably by passing hydrocarbons over the heated carrier materials (metal, Porcelain, coal, etc.) in the absence of air and expediently under considerable negative pressure is obtained is almost invulnerable to mechanical and electrical influences, ensures the greatest durability and reliability of the microphones and sets the annoying noise of the microphones down to a very small amount. aside from that In this way, the serial production of quality microphones is only possible the same quality and the same properties are ensured, their electrical and acoustic Properties can be precisely determined in advance, since according to the new method the hard carbon coating can be precisely determined according to hardness and strength.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES73007D DE535972C (en) | 1926-01-21 | 1926-01-21 | Microphone contact body with hard carbon coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES73007D DE535972C (en) | 1926-01-21 | 1926-01-21 | Microphone contact body with hard carbon coating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE535972C true DE535972C (en) | 1931-10-19 |
Family
ID=7503619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DES73007D Expired DE535972C (en) | 1926-01-21 | 1926-01-21 | Microphone contact body with hard carbon coating |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE535972C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1041536B (en) * | 1952-01-30 | 1958-10-23 | Siemens Ag | Electrically conductive material in powder or semolina form as a microphone filling for telephone microphones |
| DE1111745B (en) * | 1958-08-07 | 1961-07-27 | Schunk & Ebe Gmbh | Graphite anodes with a smooth and solid outer layer for mercury vapor rectifiers, glow cathode rectifiers and transmitter tubes |
| DE1283900B (en) * | 1967-03-07 | 1968-11-28 | Telefunken Patent | Contact microphone and process for its manufacture |
-
1926
- 1926-01-21 DE DES73007D patent/DE535972C/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1041536B (en) * | 1952-01-30 | 1958-10-23 | Siemens Ag | Electrically conductive material in powder or semolina form as a microphone filling for telephone microphones |
| DE1111745B (en) * | 1958-08-07 | 1961-07-27 | Schunk & Ebe Gmbh | Graphite anodes with a smooth and solid outer layer for mercury vapor rectifiers, glow cathode rectifiers and transmitter tubes |
| DE1283900B (en) * | 1967-03-07 | 1968-11-28 | Telefunken Patent | Contact microphone and process for its manufacture |
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