| 摘要 |
A dipole loudspeaker includes a rigid support containing an opening and a generally planar multi-layered flexible diaphragm mounted on the support and extending across the opening. The diaphragm is formed of a plurality of layers of thin flexible membrane material, each of the layers having a different height and containing a thin electrical conductor arranged in a predetermined pattern on one surface thereof. The conductor patterns on each of the membranes have different masses, whereby the membrane defines along its height areas of various thickness and varying mass whereby the membrane is suitable for more accurately reproducing or generating high and low frequencies when the electrical conductors are connected with a source of sound signal currents. A plurality of magnets are mounted in spaced relation opposite at least one surface of the membrane and the conductor patterns for vibrating the membrane to reproduce the sound in response to the sound signal currents through the conductor. A flexible connection is provided between the membrane and the support along at least one side edge at the lower portion thereof to provide lateral flexing of the membrane side edges while maintaining the edges substantially in the plane of the diaphragm. This flexible connection of the lower portion of the membrane side edges permits long excursion of the diaphragm and a direction toward and away from the magnet in order to more accurately reproduce low frequencies. An acoustic filter is provided on the loudspeaker support for attenuating rearwardly directed low frequencies without impeding long excursion of the diaphragm. The membrane and support are also designed to provide directionality and an accurate three-dimensional image of sound.
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