Radially expanding multiple flat-surfaced waveguide device

Details Radially expanding multiple flat-surfaced waveguide device Radially expanding multiple flat-surfaced waveguide device

1997-11-10

1999-11-23

Kuntz, Curtis A.

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Having acoustic wave modifying structure

381337, 381339, 381340, 181159, 181177, 181192, H04R 102, H04R 2500

Patent

active

059914211

ABSTRACT:
The present invention is a waveguide for an acoustic speaker having a predetermined cone weight. The waveguide body has a speaker end and an open end and an even number of segments with a flat surface in a plane parallel to the speaker end. The segments have inside wall surfaces which flare increasingly outwardly from the speaker, and these inside wall surfaces have a speaker end length, L.sub.1, determined by the following formulas, L.sub.1 minimum=0.7.times.w.sub.s /0.0012 g/cm.sup.3 .times.1/A.sub.SE, and L.sub.1 maximum=1.2.times.w.sub.s /0.0012 g/cm.sup.3 .times.1/A.sub.SE, wherein L.sub.1 is a straight line length of the lower portion of the segment wall surface, w.sub.s is the weight of a speaker cone in grams/cm.sup.3, and A.sub.SE is the cross-sectional area of the speaker end in square centimeters. Each of the segment inside wall surfaces has an outer end length L.sub.2 which has a predetermined length related to L.sub.1. There is an angle between the straight line length of the lower portion of the segment wall surface and a center line running down the center of the length of the waveguide, referred to as .angle.A, which is no greater than 15.degree..

REFERENCES:
patent: 2513171 (1950-06-01), Hassan
patent: 2923782 (1960-02-01), Armstrong et al.
patent: 4811403 (1989-03-01), Henricksen
patent: 5606297 (1997-02-01), Phillips

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