Moving coil loudspeakers
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United States of America Patent
Stats
-
Jan 24, 1984
Grant Date -
N/A
app pub date -
Feb 20, 1981
filing date -
Feb 21, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A moving coil loudspeaker having a cone (14) made of homopolymeric polypropylene which is stiffened by the incorporation of from 20% to 40% mineral filler such as talc or chalk, possibly also up to 5% carbon black filler, and preferably is additionally rigidified at the cone center by a stiffening ring (21) of nylon or like hard plastics material. A further feature of the invention resides in the provision of a metal former (22) carrying lapping paper (25) at the joint with the cone.
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Family
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Cited Art Landscape
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