US2410528A - Microphone - Google Patents

Microphone Download PDF

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Publication number
US2410528A
US2410528A US412893A US41289341A US2410528A US 2410528 A US2410528 A US 2410528A US 412893 A US412893 A US 412893A US 41289341 A US41289341 A US 41289341A US 2410528 A US2410528 A US 2410528A
Authority
US
United States
Prior art keywords
chamber
diaphragm
case
microphone
space
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 - Lifetime
Application number
US412893A
Other languages
English (en)
Inventor
Soldan Otto
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.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US2410528A publication Critical patent/US2410528A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R21/00—Variable-resistance transducers
    • H04R21/02—Microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R21/00—Variable-resistance transducers
    • H04R21/02—Microphones
    • H04R21/021—Microphones with granular resistance material

Definitions

  • This invention relates to a microphone having a pressure compensation chamber which eliminates the changes in tension caused in the interior of the case by the influence of the ambient temperature.
  • the operating diaphragm and the carbon chamber of such microphones are arranged in a closed chamber of the case, the chamber being defined by a sealing diaphragm from the operating side and by a flexible water-tight protective wall from the opposite side.
  • this chamber must be tested for air-tightness, which entails connecting a testing device to the chamber.
  • This is accomplished according to the invention by providing the chamber of the case enclosed by the sealing diaphragm and the water-tight protective wall with an opening so as to enable a testing of the chamber for the air-tightness, said opening being accessible from outside and capable of being closed.
  • the opening capable of being closed is arranged according to the invention in the contact member mounted at the rear side of the case, which member projects into a space arranged behind the fixed electrode and closed by the protective wall, said space being in communication with the pressure compensation chamber, the portion of the cup-shaped member for the fixed electrode extending in this path of communication being provided for this purpose with one or more openings.
  • the single figure shows a sectional view of one half of the sealed microphone case according to the invention.
  • the carbon chamber I which is defined by the fixed electrode 2 and the felt ring I4.
  • the chamber is closed by the operating diaphragm 3 provided with the movable electrode 2'.
  • a diaphragm 6 is employed consisting of a water-tight foil and arranged at the operating side.
  • the diaphragm 6 rests directly on the operating diaphragm 3 and is preferably glued to the flexible water-tight protective wall I forming the lower 2 wall of the chamber I9 as well as to the inner wall of the edge I5 of the case 4, bent at right angles in order to attain a completely air-tight seal of this portion of the case chamber. Since the protective wall I with its portion II extends at the rear side of the case 4 up to the opening for the contact nipple I3, the hollow space I6 behind the fixed electrode 2 is also protected against moisture by the intermediate wall II.
  • the cupshaped member II of the fixed electrode 2 is not in direct engagement with the latter, but only with the felt ring I4 so that a path of communication I8 from the space I6 behind the electrode 2 to the pressure compensation chamber I9 proper is thereby provided, which path enables through the openings 20 arranged in the electrode cup-shaped member II a free access of air from the one space to the other.
  • the hollow space I 5 is closed in the central portion of the rear wall of the case by the contact nipple l3.
  • This contact member is provided with a bore 2I which is closed by a screw 22 and enables after the loosening of the screw the fastening of a control gauge, for instance, of a manometer or the like for testing the pressure compensation chamber for airtightness.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Measuring Fluid Pressure (AREA)
US412893A 1940-10-26 1941-09-29 Microphone Expired - Lifetime US2410528A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE227747X 1940-10-26
CH220358T 1942-06-20

Publications (1)

Publication Number Publication Date
US2410528A true US2410528A (en) 1946-11-05

Family

ID=25726440

Family Applications (1)

Application Number Title Priority Date Filing Date
US412893A Expired - Lifetime US2410528A (en) 1940-10-26 1941-09-29 Microphone

Country Status (2)

Country Link
US (1) US2410528A (de)
CH (2) CH220358A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2521744A (en) * 1944-08-15 1950-09-12 Int Standard Electric Corp Moistureproof microphone
US3277247A (en) * 1961-03-02 1966-10-04 Siemens Ag Moisture-proof carbon microphone

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE960998C (de) * 1954-02-26 1957-03-28 Standard Elek K Ag Kohlemikrofon mit beweglicher Tauchelektrode

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2521744A (en) * 1944-08-15 1950-09-12 Int Standard Electric Corp Moistureproof microphone
US3277247A (en) * 1961-03-02 1966-10-04 Siemens Ag Moisture-proof carbon microphone

Also Published As

Publication number Publication date
CH220358A (de) 1942-03-31
CH227747A (de) 1943-06-30

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