DE438232C - microphone - Google Patents

microphone

Info

Publication number
DE438232C
DE438232C DER66393D DER0066393D DE438232C DE 438232 C DE438232 C DE 438232C DE R66393 D DER66393 D DE R66393D DE R0066393 D DER0066393 D DE R0066393D DE 438232 C DE438232 C DE 438232C
Authority
DE
Germany
Prior art keywords
microphone
rubber skin
powder
sieve
perforated
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
DER66393D
Other languages
German (de)
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.)
Individual
Original Assignee
Individual
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.)
Publication date
Priority to DER66393D priority Critical patent/DE438232C/en
Priority claimed from DER64656D external-priority patent/DE436127C/en
Application granted granted Critical
Publication of DE438232C publication Critical patent/DE438232C/en
Expired legal-status Critical Current

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
    • H04R21/02—Microphones
    • H04R21/026—Microphones in which the sound is perpendicular to the current crossing the transducer material

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Description

Mikrophon. Nach dem Hauptpatent wird die die Pulvermasse seitlich haltende Gummihaut von dem vorstehenden Rand einer Gitterplatte eingeklemmt, die mit der Gummihaut selbst nicht unmittelbar in Berührung steh, Diese Einrichtung hat den Nachteil, daß das Kohlepulver nach unten wandert, wobei die Spannung der Gummihaut und die Aufschüttungshöhe des Pulvers sich dauernd verändert.Microphone. According to the main patent, the powder mass is laterally holding rubber skin pinched by the protruding edge of a grid plate, the not in direct contact with the rubber skin itself, this device has the disadvantage that the carbon powder migrates downwards, the tension of the The rubber skin and the height of the powder pile are constantly changing.

Dieser Übelstand wird nach der Erfindung dadurch beseitigt, daß die Gummihaut auf der ganzen Höhe der Kohlekarnmer von einer siebartig _ durchlöcherten, schwingungsfreien Platte gehalten wird.This drawback is eliminated according to the invention in that the Rubber skin on the whole height of the coal chamber from a sieve-like _ perforated, vibration-free plate is held.

Ein derartiges Mikrophon ist in Abb. 1 im wagerechten Querschnitt und in Abb.2 in Vorderansicht dargestellt.Such a microphone is shown in Fig. 1 in a horizontal cross-section and shown in Fig.2 in front view.

Die Gummihaut f, die sich seitlich gegen das in der Kammer des festen Blockes a hefindliche Kohlepulver c legt, wird. auf ihrer ganzen Fläche von einer siebartig durchlöcherten Platte m aus Hartgummi oder ähnlichem schwingungsfreien Stoff gehalten.The rubber skin f, which is laterally against that in the chamber of the fixed Blockes a hostile coal powder c sets, will. on its entire surface by one sieve-like perforated plate m made of hard rubber or similar vibration-free Fabric held.

Das Kohlepulver kann infolgedessen nicht mehr nach unten wandern, und die Spannung der .Gummihaut sowie die Aufschüttungshöhe des Kohlepulvers bleibt im wesentlichen unverändert. Dadurch wird auch erreicht, daß der Gleichstromwiderstand des Mikrophons seinen Wert beibehält.As a result, the coal powder can no longer migrate downwards, and the tension of the rubber skin and the height of the embankment of the carbon powder remains essentially unchanged. This also ensures that the direct current resistance of the microphone maintains its value.

Claims (1)

PATENTANSPRUCH: Mikrophon _ nach Patent 436127, dadurch gekennzeichnet, daß die das Kohlepulv er seitlich haltende Gummihaut (f) auf ihrer ganzen Fläche von einer siebartig durchlöcherten, schwingungsfreien Platte (m) gehalten wird. PATENT CLAIM: Microphone according to patent 436127, characterized in that the rubber skin (f) holding the carbon powder laterally is held over its entire surface by a sieve-like perforated, vibration-free plate (m).
DER66393D 1925-06-23 microphone Expired DE438232C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DER66393D DE438232C (en) 1925-06-23 microphone

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DER66393D DE438232C (en) 1925-06-23 microphone
DER64656D DE436127C (en) 1925-06-23 1925-06-23 Microphone with fixed electrodes and loose carbon or the like.

Publications (1)

Publication Number Publication Date
DE438232C true DE438232C (en) 1926-12-09

Family

ID=25992232

Family Applications (1)

Application Number Title Priority Date Filing Date
DER66393D Expired DE438232C (en) 1925-06-23 microphone

Country Status (1)

Country Link
DE (1) DE438232C (en)

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