Magnetic speaker

Details Magnetic speaker Magnetic speaker

1985-12-27

1987-10-13

Fuller, Benjamin R.

Acoustics

Diaphragm

Critically defined material or coating

181167, 181173, 381203, H04R 706

Patent

active

046992421

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.

REFERENCES:
patent: 1500331 (1924-07-01), Marriott
patent: 1690726 (1928-11-01), Holinger
patent: 4567327 (1986-01-01), Goossens et al.

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