Loudspeaker having sound funnelling element
OwnerHerbert J. Schultzinventor
Life of this patent
Estimating the term…
Abstract
An elliptically tapered tube or funnel shaped element is fixed to a loudspeaker so that its large diameter end overlies a central region of the loudspeaker diaphragm and such that its small diameter end extends away from the diaphragm. The loudspeaker diaphragm need not extend beyond the line on which it is connected to the funnel element, but does in the preferred embodiment. The funnel element has a cross-sectional shape that differs on planes parallel to the plane of the base which lie at different distances from the base. A funnel that is circular in cross-section at all of those parallel planes does not exhibit high fidelity response with the brilliance and clarity that distinguishes speakers having the non-uniform cross-sectional shape.
Claims8
In a speaker of the kind in which a diaphragm is suspended at its margins from a frame and is caused to move in response forces applied to its mid region, the improvement which comprises:
- a funnelling member in the form of a tapered tube having a larger opening at one of its ends than the smaller opening at the other;
- said funnelling member having the margin of its larger opening in engagement with and fixed to said diaphragm such that it encompasses said mid region at which said forces are applied;
- means in the form of said smaller opening for permitting flow of air into and out of the interior of said funnelling member as an incident to application of force to said diaphragm;
- said funnelling member having generally elliptical cross-sectional shape in planes extending to it parallel to the plane of the margin of said larger opening;
- and
- said funnelling member having a length greater than the avereage diameter of said mid region encompassed by said larger end of the funnelling member such that it extends beyond the plane of said frame.
In a speaker of the kind in which a diaphragm is suspended at its margins from a frame and is caused to move in response to forces applied to its mid region, the improvement which comprises:
- a funnelling member in the form of a tapered tube having a larger opening at one of its ends than the smaller opening at the other;
- said funnelling member having the margin of its larger opening in engagement with and fixed to said diaphragm such that it encompasses said mid region at which said forces are applied;
- means in the form of said smaller opening for permitting flow of air into and out of the interior of said funnelling member as an incident to application of force to said diaphragm;
- said diaphragm being elliptical and conical;
- said funnelling member being elliptical and conical and having its central line substantially coincident with that of said diaphragm;
- and
- said funnelling member becoming less elliptical and approaching circularity in the direction away from said diaphragm and having a taper such that the diameter of the smaller opening is no greater than half of the greatest width of the larger opening of said member.
In a speaker of the kind in which a diaphragm is suspended at its margins from a frame and is caused to move in response to forces applied to its mid region, the improvement which comprises:
- a funnelling member in the form of a tapered tube having a larger opening at one of its ends than the smaller opening at the other;
- said funnelling member having the margin of its larger opening in engagement with and fixed to said diaphragm such that it encompasses said mid region at which said forces are applied;
- means in the form of said smaller opening for permitting flow of air into and out of the interior of said funnelling member as an incident to application of force to said diaphragm;
- the area of said diaphragm encompassed by said funnelling member being less than its total area;
- said funnelling member having a length greater than the average dimension across said larger end of the funnelling member.
Dependencies are inferred from the claim text.