Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent
1980-01-04
1985-07-30
Stellar, George G.
Acoustics
Anatomic or prosthetic relation
Ear and mouth
1791155DV, 1791155VC, 179181R, 181157, 181163, 181165, 181174, H04R 702, H04R 712, H04R 902, H04R 906
Patent
active
045323836
ABSTRACT:
To provide for good wide range frequency response utilizing only a single lightweight diaphragm in a peripherally-driven electroacoustic transducer, the diaphragm is made with a variable thickness. The region along the peripheral edge of the diaphragm is the thinnest portion of the diaphragm. From this peripheral edge, the thickness gradually increases to a point of maximum thickness in a portion of the diaphragm other than the periphery. The taper can be such as to provide a diaphragm with either two convex surfaces or with one convex surface and one concave surface. Alternatively, the taper could be linearly. A further embodiment provides for an air-filled diaphragm made of two sheets of thin material with a valve arrangement to allow for rapid self-inflation of the diaphragm.
REFERENCES:
patent: 1713006 (1929-05-01), Round
patent: 1999862 (1935-04-01), Bowles
patent: 2034882 (1936-03-01), Scribner
patent: 2205365 (1940-06-01), Schwaen
patent: 2926741 (1960-03-01), Rohn et al.
patent: 4088847 (1978-05-01), Yukimoto et al.
patent: 4140203 (1979-02-01), Niguchi et al.
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