Metal working – Method of mechanical manufacture – Electrical device making
Patent
1974-11-11
1976-06-08
Lanham, C. W.
Metal working
Method of mechanical manufacture
Electrical device making
181167, 179115R, 179181R, H04R 3100
Patent
active
039613780
ABSTRACT:
A cone for a loudspeaker in which the shear function is more nearly the same at all radii, the shear function being the product of the effective axial thickness at a given radius multiplied by the circumferential length at such radius. The cone is preferably of curved or "exponential" cross section, deeply angled at a central throat but flattening out to approach a plane at the periphery. The cone is made of light, dimensionally stable material characterized by a high velocity of sonic conduction and is preferably in the form of hollow spheres of glass of small dimension in a binder of epoxy or the like. In an alternate embodiment the cone is made of a hard solid acrylic plastic in thin section and with supporting ribs to provide both rigidity and a substantially constant shear function. Encircling the cone is a flexible hinge or "surround". Interposed between the hinge and the edge of the cone is a light collar having axial rigidity to ensure that the edge of the cone remains in a planar locus. The cone, collar and surround may be made integral with one another in a production line setup. At the center of the cone a stiff cap is provided for closing the central opening and for imparting circular and axial rigidity in the region of attachment of the voice coil.
REFERENCES:
patent: 2685935 (1954-08-01), Lenz
patent: 2905260 (1959-09-01), Williams
patent: 3046362 (1962-07-01), White
patent: 3292730 (1966-12-01), Moskow
patent: 3612783 (1971-10-01), Schneider
patent: 3632703 (1972-01-01), Sullivan et al.
patent: 3708035 (1973-01-01), Sotome
patent: 3858680 (1975-01-01), Tsuge et al.
Crane Dan C.
Lanham C. W.
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