Microphone

Details Microphone Microphone

1957-10-29

1979-02-27

Birmiel, Howard A.

H04R 2102

Patent

active

041420748

ABSTRACT:
1. A sound actuated device comprising a non-metallic cylindrical case having a closed end provided with a coaxial aperture extending therethrough, a carbon cup having a hemispherical recess with a coaxial aperture extending therethrough, a flexible wire loop, the said carbon cup being affixed within the said case in such manner that the apertures of both cup and case are in alignment with the said wire loop interposed between the abutting surfaces of the cup and the end of the case and disposed about the aperture, a carbon button of curvature complimentary to the recess of the said cup and in fixed aligned suspension therein, a flexible annular retainer concentrically secured to said carbon button and affixed to the radial outer surfaces of said carbon cup to maintain said button in said fixed aligned suspension, a first lead means passing through the said button along the central axis thereof and conductively affixed therein with the terminus thereof beyond the curved surface, carbon granules loosely distributed and contained between the said button, said cup and in the aperture of the said case, a non-metallic cone shaped diaphragm with the apex thereof attached to the center of the said carbon button and a second lead means connected to said wire loop; whereby sound induced vibrations on the diaphragm result in the reciprocal movements of the carbon button which in turn compresses and decompresses the carbon granules, thus inducing a variation of resistance between the first and second lead means.

REFERENCES:
patent: 1096677 (1914-05-01), Brown
patent: 1637243 (1927-07-01), Reisz
patent: 2607859 (1952-08-01), Bryant

Affiliated with

Also associated with

Rating

Microphone does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Microphone, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microphone will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-724072