Brian Buck Cheney

US Patent:

7835537, Nov 16, 2010

Filed:

Oct 13, 2005

Appl. No.:

11/249572

Inventors:

Brian E. Cheney - El Sobrante CA, US

International Classification:

H04R 9/08
H04R 1/20
H04R 1/00
H05R 1/00
H05K 5/00

US Classification:

381337, 381345, 381423, 381432, 381431, 381338, 181148

Abstract:

A loudspeaker may include a baffle, a planar diaphragm transducer carried by the baffle and having a front surface for radiating acoustic energy therefrom, and a slotted waveguide adjacent the front surface of the planar diaphragm transducer. The planar diaphragm transducer may be operable to a desired high frequency, and the slotted opening may have a width not substantially greater than a wavelength corresponding to the desired high frequency. For example, for a desired high frequency of about 20 KHz, the slotted opening may have a width not greater than about two-thirds of an inch. Accordingly, the loudspeaker including the slotted waveguide may provide nearly constant horizontal directivity over a large angle. In another embodiment, the loudspeaker may include a conical diaphragm transducer with a slotted waveguide adjacent its front surface.