DIFFRACTION BLADE FOR LOUDSPEAKER UNIT
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United States of America Patent
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Issued Date -
Jul 28, 2016
app pub date -
Mar 19, 2015
filing date -
Mar 19, 2015
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Abstract
A diffraction blade includes a diffraction blade body and a diffraction blade edge for widening an acoustic planar wave entering a waveguide horn having a subtended angle. The diffraction blade is disposed at a specific focal length from an acoustic diffraction slit of an acoustic generator to effectively form subdivided slits. The divided waveforms created by the diffraction blade have the same phase/time at the diffraction blade edge and as they recombine at the end of the diffraction blade body. Thus, the divided wave forms are mirror images of each other. The focal length, along with the width and horizontal length of the diffraction blade, are selected to ensure that the phase and direction of the acoustic planar waveforms from the subdivided slits match when recombined and exiting from a subtended angle of the waveguide horn as a widened acoustic planar wave.
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