Method of making elements of a magnetic circuit in a loudspeaker

Details Method of making elements of a magnetic circuit in a loudspeaker Method of making elements of a magnetic circuit in a loudspeaker

1991-12-20

1993-12-14

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

335222, 335281, 72267, H01F 700, H01F 708

Patent

active

052706761

ABSTRACT:
A lower die having a first recess corresponding to one of outer shapes of the element, and an upper die having a second recess are provided. The outer diameter of the upper dies is smaller than the inner diameter of the first recess so that a gap is formed between the inside wall of the first recess and the outside wall of the upper die. A workpiece is put between the lower and upper dies, and the upper die is pressed against the lower die to form the element.

REFERENCES:
patent: 2965228 (1960-12-01), Scribner
patent: 3460080 (1969-08-01), Carbonaro
patent: 3861191 (1975-01-01), Sato et al.
patent: 3953687 (1976-04-01), Carbonneau

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