US Patent 7995777 - Thin film transparent acoustic transducer with CNTs

http://www.freepatentsonline.com/7995777.html

This patent teaches how carbon nanotube coatings can improve the performance of piezoelectric actuators used in audio speakers. Claim 1 reads:


1. A speaker comprising:

a piezoelectric substantially transparent thin film polymer having a first side and a second side;

a first thin film coating of conductive carbon nanotubes supported by the first side of the piezoelectric thin film polymer; and

a second thin film coating of conductive carbon nanotubes supported by the second side of the piezoelectric thin film polymer,

wherein the conductive carbon nanotube thin films are substantially transparent and are approximately 100 nm or less in thickness.