Sughrue, Rothwell, Mion, Zinn and Macpeak
Thin film, thermoplastic piezoelectric switches
 A piezoelectric switch is disclosed for providing a continuous output in response to a contact pressure. An oscillator is brought into contact with a thermoplastic piezoelectric film, having electrodes on both surfaces thereof, via an elastic wave absorbing member.The oscillations cause constantly changing stress in the film, resulting in a constantly varying electric field between the electrodes. The magnitude of the electric field depends on the contact pressure between the oscillator and the piezoelectric element. 
Kureha Kagaku Kogyo Kabushiki Kaisha
Y H
Y10S H03K
additional inventional
Naohiro Masafumi
Murayama Yoshida