Speaker diaphragm having flat response curve
AssigneePioneer Electronic Corporation
InventorAkio Obuchi
Life of this patent
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Abstract
The nodal circle between the inner and outer concentric portions of an audio speaker diaphragm is positioned so that the ratio of the areas of the inner and outer portions is approximately equal to the ratio of their respective masses, whereby the frequency response curve remains relatively flat and is not affected by first order resonance.
Claims6
In a audio speaker including a diaphragm having concentric, contiguous inner and outer portions, said diaphragm being adapted to vibrate in a split mode wherein the interface between said inner and outer portions is defined by a nodal circle, and a voice coil operatively associated with one of said portions, the improvement characterized by:
- the nodal circle being positioned such that the ratio S.sub.i :
- S.sub.o is approximately equal to the ratio m.sub.i :
- m.sub.o, where
- S.sub.i is the surface area of the inner portion,
- S.sub.o is the surface area of the outer portion,
- m.sub.i is the mass of the inner portion, and
- m.sub.o is the mass of the outer portion.
Dependencies are inferred from the claim text.