Charles G Corbett

US Patent:

41420748, Feb 27, 1979

Filed:

Oct 29, 1957

Appl. No.:

3/693217

Inventors:

Charles K. Corbett - Bethesda MD

Assignee:

The United States of America as represented by the Attorney General of
the United States - Washington DC

International Classification:

H04R 2102

US Classification:

179124

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.