Magnetic speaker
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United States of America Patent
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-
Oct 13, 1987
Grant Date -
N/A
app pub date -
Dec 27, 1985
filing date -
Dec 28, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A magnetic speaker equipped with a flat diaphragm comprising a straight-grain wood plate or a cross-grain wood plate, for instance, made of Sitka spruce having the specific gravity range from 0.25 to 0.8, presenting excellent acoustic properties, especially, suitable for low to medium frequency speakers. The flat diaphragm is treated to chemically modify hydroxyl groups contained in the wooden component. Modification may be by esterification, etherification, acetilation, formalinization, or the like to enhance acoustical characteristics.
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