Speaker equipped with diaphragm filled with foamed resin

Details Speaker equipped with diaphragm filled with foamed resin Speaker equipped with diaphragm filled with foamed resin

1982-06-14

1984-10-23

Gellner, Michael L.

Acoustics

Diaphragm

Critically defined material or coating

181166, 181169, 181DIG1, 179181F, 4283193, G10K 1300

Patent

active

044783094

ABSTRACT:
A speaker provided with a diaphragm having a foamed resin body of relatively low density on its front surface includes a thin sheet of foamed resin applied to its surface. The thin sheet of foamed resin has relatively high flexural rigidity and is impermeable to air, to enable the surface of the foamed resin body to be protected against damage or indentation that might otherwise be caused. The thin sheet of foamed resin may be coated with a paint or have a foil applied to its surface. The speaker has improved electroacoustic transducing efficiency.

REFERENCES:
patent: 3093207 (1963-06-01), Bozak
patent: 3187832 (1965-06-01), Broadley
patent: 4275278 (1981-06-01), Sakurai et al.

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