User Manual

Piezoelectric Polymer Speakers Application Note 1242138
Page 83
The lead attachment area should not be on the PVDF film radiating surface because any non-uniformity in the
radiating element can be a source for distortion of air cavity. Filling the enclosure with a sound absorbing
materials such as fiberglass or absorbing foams will reduce resonances and improve the sound quality
. The
enclosure should be made as rigid as possible to reduce structural resonances.
APPLICATIONS AND ADVANTAGES
Piezoelectric polymer speakers can be made in just about any imaginable shape or size. Square or
rectangular elements can be sized to fit any available space. Wide horizontal or vertical dispersion angles can
be obtained by wrapping the film in a 180 degree or 360 degree shape. The film can form a stand alone
speaker element or can be laminated or attached to other structures to become an integrated speaker. A
single film held in a shape with different curvatures in different areas of the film can provide unusual and
unique frequency response characteristics. Piezo film speakers have the advantages of flat frequency
response, high sound quality, low weight, flexible form factor, low cost, and ease of manufacturability. PVDF
film speakers have a wide range of applications including home stereo, home theater, automotive, personal
stereo, multi-media, and stereo headphones.
SAMPLE SPECIFICATION
PARAMETER VALUE
Frequency Range 3.5 kHz - 20 kHz
SPL @ 40 cm 105 dB +/- 5 dB
Drive Voltage 125 V
rms
Enclosure Dimensions
13 cm X 11 cm X 6 cm
Radius of Curvature 7 cm
PVDF Thickness 52 µM
PVDF Capacitance 24 nF
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