Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent
1978-03-14
1979-01-02
Stellar, George G.
Acoustics
Anatomic or prosthetic relation
Ear and mouth
179181R, 181165, 181174, H04R 714, H04R 902
Patent
active
041328728
ABSTRACT:
A movable coil type electroacoustic vibrating plate of rigid structure, composed of two principal parts, one being a thin-walled annular plate portion, having concentrical outer periphery and inner periphery, of substantially truncated conical configuration, and the other being a thin-walled circular dome-like plate portion for occupying the central circular portion of the former inside the inner periphery. The former is provided with a number of radial ribs on the inner surface thereof with an equal circumferential angular distance, and the latter is also provided with a plurality of diametrical ribs of half-moon shape on the concaved inner surface thereof with an equal circumferential angular distance. The former and the latter are integrally formed mostly and connected with the axial end portion of the bobbin provided with the voice coil.
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