Adding to those features, this future loudspeaker has a simple structure, not consisting of any moving parts or magnets. Conventional loudspeakers include at least a cone, a voice coil connected to the apex of the cone, a permanent magnet attached to the loudspeaker’s frame, and an enclosure. By applying an audio current waveform to the voice coil, an audio frequency movement of the cone is generated due to the magnetic interaction between the voice coil and the magnet.
The most promising property is the stretch-ability of the film. Using springs (which double up as electrodes), the film can be uniformly stretched up to a maximum of 200% of its original size and with this, the film increases in transparency. This see-through feature could enable the CNT film loudspeaker to be adapted to LCD modules. If the loudspeaker film is mounted on top of a LCD module, transmittance is reduced to 80%, with the view being only slightly darker than usual. However, by stretching the film or by administering a laser treatment, the transmittance increases to 95%. The film can also be applied to the iPod, placed on window glass, or even over paintings to make transparent loudspeakers.
There is no doubt that more and more applications using CNT films could be developed as time goes on. The CNT thin films can also be made into small area devices such as earphones and buzzers. This technique might open up new applications and approaches to manufacturing loudspeakers and other acoustic devices.