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US 8,290,195 B2Granted
Acoustic radiation pattern adjusting
AssigneeBose Corporation
InventorsGeoffrey C. Chick, Dewey L. Potter
Life of this patent
Estimating the term…
Abstract
A loudspeaker having an omnidirectional radiation pattern at high frequencies. The loudspeaker includes an acoustic device that includes an acoustic enclosure; an acoustic driver, mounted in the acoustic enclosure; and a sheet of compliant material with a aperture therethrough, mounted in the enclosure, between the acoustic driver and the environment.
Claims20
A loudspeaker, comprising:
- an acoustic device, comprising
- an acoustic enclosure;
- an acoustic driver, mounted in the acoustic enclosure;
- and
- a sheet of compliant material with a aperture therethrough, mounted in the enclosure, between the acoustic driver and the environment, wherein the area of the aperture is less than half of the acoustic driver, the compliant sheet and the aperture configured so that less acoustic radiation of wavelengths close to or less than the diameter of the radiating surface is radiated on-axis and more acoustic radiation of wavelengths close to or less than the diameter of the radiating surface is radiated off-axis than is radiated by a loudspeaker with the same dimensions and without the sheet of compliant material.
2 more elements
An array loudspeaker comprising:
- a plurality of acoustic drivers;
- each of the plurality of acoustic drivers comprising a sheet of compliant material having a vertical slot shaped aperture therethrough, between the each of the plurality of acoustic drivers and the environment, the aperture having a cross sectional area less than 0.1 times the cross sectional areas of the each of the acoustic drivers so that less acoustic radiation of wavelengths close to or less than the diameter of the radiating surface is radiated on-axis and more acoustic radiation of wavelengths close to or less than the diameter of the radiating surface is radiated off-axis than is radiated by a loudspeaker with the same dimensions and without the sheet of compliant material.
Dependencies are inferred from the claim text.