Patent
1974-11-29
1976-04-27
Claffy, Kathleen H.
179119R, H04R 902
Patent
active
039536874
ABSTRACT:
A loudspeaker magnet structure has a flat annular, torus shaped, permanent magnet with a central cylindrical pole piece of magnetically conductive material extending coaxially through the magnet. A back plate of magnetically conductive material is lapped across the rear side of the magnet and engaged around or over the rear end of the pole piece. A front plate of magnetically conductive material is lapped against the front surface of the magnet and has a central hole of greater diameter than the diameter of the pole piece surrounding the front end of the pole piece.
The front surface of the front plate tapers rearwardly to the rear surface of the front plate in continuously decreasing thickness from adjacent to the central hole to closely adjacent to the outer edge of the magnet. The rear surface of the rear plate tapers rearwardly in constantly increasing thickness from closely adjacent to the outer edge of the magnet to a central portion of constant thickness having a diameter approximately equal to the diameter of the cylindrical pole piece.
REFERENCES:
patent: 1795948 (1931-03-01), High
patent: 2556816 (1951-06-01), Lukacs
patent: 3296386 (1967-01-01), Fanselow
patent: 3453400 (1969-07-01), Coen
patent: 3593239 (1971-07-01), Hofman
Carbonneau Industries, Inc.
Claffy Kathleen H.
Stellar George G.
Webb Austin A.
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