Telegraphy – Systems – Position coordinate determination for writing
Patent
1996-08-09
1998-12-22
Shankar, Vijay
Telegraphy
Systems
Position coordinate determination for writing
178 1902, 345177, G08C 2100, G09G 500
Patent
active
058522611
ABSTRACT:
A surface acoustic wave touch-position sensing device comprising at least two surface acoustic wave-transducing units X and Y having N propagation lanes U.sub.Xi (i=1, 2, . . . , N) and U.sub.Yi (i=1, 2, . . . , N), respectively, a nonpiezoelectric plate, and a controlling system connected with the units X and Y. Each unit includes a piezoelectric substrate P.sub.T, a piezoelectric substrate P.sub.R, at least an input interdigital transducer formed on one end surface of the piezoelectric substrate P.sub.T, and at least an output interdigital transducer formed on one end surface of the piezoelectric substrate P.sub.R. The piezoelectric substrates P.sub.T and P.sub.R are mounted on an upper end surface of the nonpiezoelectric plate. When an electric signal E.sub.T is applied to the input interdigital transducer, a surface acoustic wave is excited in the piezoelectric substrate P.sub.T. The surface acoustic wave is transmitted to the piezoelectric substrate P.sub.R through the upper end surface of the nonpiezoelectric plate, and is transduced to an electric signal E.sub.R. If touching a crossing point of the lanes U.sub.Xi and U.sub.Yi on the upper end surface of the nonpiezoelectric plate, the surface acoustic wave is intercepted at the crossing point. Therefore, the magnitude of the electric signal E.sub.R corresponding to the crossing point decrease or disappearance. Thus, it is possible to specify the crossing point.
REFERENCES:
patent: 4587565 (1986-05-01), Eden
patent: 5134689 (1992-07-01), Murakami et al.
patent: 5260521 (1993-11-01), Knowles
patent: 5260913 (1993-11-01), Kadota et al.
patent: 5638093 (1997-06-01), Takahashi et al.
LandOfFree
Surface acoustic wave touch-position sensing device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Surface acoustic wave touch-position sensing device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Surface acoustic wave touch-position sensing device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2050065