Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1985-02-05
1987-10-13
Caldwell, Sr., John W.
Communications: electrical
Audible indication
Percussion-type sound producer
340112, 178 18, H04L 100, G06F 302
Patent
active
047001763
ABSTRACT:
A system for recognizing touch positions along a coordinate axis on a surface associated with a touch control apparatus comprises a substrate having a surface capable of propagating surface acoustic waves and is so characterized that a touch on that surface causes a partial absorption of energy of a surface wave passing through the region of touch. An input surface wave transducer coupled to the surface launches a burst of surface waves on the surface in a first direction parallel to the axis. An output surface wave transducer coupled to the surface receives the burst of surface waves. A first surface wave reflecting arrangement derives wave components from the launched wave and reflects them across the surface to a second wave reflecting arrangement that redirects the reflected components in a direction opposited the first direction. The reflecting arrangements collectively cause wave components to traverse the surface orthogonally to the coordinate axis along a progression of paths associated with different positions along that axis. Circuitry coupled to the input and output trnasducers initiate surface wave bursts across the substrate surface as well as dsetect touch-induced damping of the received waves. A detector serves to develop an electrical signal representative of the time occurrence of the damping and thus an indication of which of the plurality of paths was traversed by the touch-damped wave and thereby the location of the touch on the substrate surface.
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Use of Apodized Metal Gratings in Fabricating Low Cost Quartz RAC Filters--G. W. Judd & J. L. Thoss IEEE Ultrasonics Symposium--p. 343.
Caldwell Sr. John W.
Fatahi-Yar Mahmoud
O'Connor Cornelius J.
Zenith Electronis Corporation
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