Method for making electrodynamic loudspeakers having a planar di

Details Method for making electrodynamic loudspeakers having a planar di Method for making electrodynamic loudspeakers having a planar di

1981-02-12

1982-09-07

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

With step of cooling to a temperature of zero degrees c. or...

264 53, 264157, 264162, B29C 1712, B29D 2700

Patent

active

043483429

ABSTRACT:
The process comprises injecting, before the polystyrene expanding stage, high-pressure steam into a mould which forms the definitive shape of the ribbed and grooved surface of a blank of the diaphragm. After removal of the blank from the mould, water is made to travel toward the ribbed and grooved surface of the blank by condensation resulting from a lowering of the temperature. The blank is then brutally frozen so as to produce microfractures in a thin superficial zone of the blank. This superficial zone is removed by means of a suitable machining operation so as to expose under this zone the softened aspect of the diaphragm immediately subjacent to this zone.
Application in the manufacture of electrodynamic loudspeakers.

REFERENCES:
patent: 2604663 (1952-07-01), Talalay
patent: 3832106 (1974-08-01), Lahousse
patent: 3863908 (1975-02-01), Charpentier
patent: 3889032 (1975-06-01), Koelsch

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