Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Patent
1981-07-31
1983-05-31
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
1791155PC, H01H 708, H04R 902
Patent
active
043863329
ABSTRACT:
A magnetic circuit for a dynamic speaker which can be manufactured inexpensively without the need of machining. The magnetic circuit includes an annularly-shaped magnet, a pole yoke having a backplate coupled to a first surface of the magnet and a pole yoke extending from a central portion of the back plate through a hole in the annularly-shaped magnet, and an annular top plate coupled to a second surface of the magnet with an air gap being formed between the top plate and the center pole. A tapered groove is formed in the back plate along a circumferential direction of the base of the center pole tapering outwardly toward the magnet. The groove extends beyond a region defined by the inner diameter of the magnet.
REFERENCES:
patent: 3679844 (1972-07-01), Derkacz
Broome Harold
Pioneer Electronic Corporation
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