Abstract: A vibration displacement sensing device comprises a piezoelectric substrate, an input interdigital transducer, a first output interdigital transducer, a second output interdigital transducer, and a signal analyzer. All the input-, the first output-, and the second output interdigital transducers are formed on one end surface of the piezoelectric substrate. If an input electric signal is applied to the input interdigital transducer, an elastic wave is excited in the piezoelectric substrate. A leaky component of the elastic wave is radiated effectively in the form of a longitudinal wave toward a first material located inside a second material which is in contact with the other end surface of the piezoelectric substrate and has an acoustic impedance different from that of the first material. The longitudinal wave is reflected by the first material. A reflected longitudinal wave is detected at the first output interdigital transducer as a first delayed electric signal.

Abstract: An ultrasound-signal radiating device comprises a piezoelectric substrate, a first input interdigital transducer, a second input interdigital transducer, an output interdigital transducer, a cap, an amplifier, and a modulator with an input terminal. All the interdigital transducers are formed on one end surface of the piezoelectric substrate. The cap is mounted on a surface part of the other end surface of the piezoelectric substrate. If an input electric signal is applied to the first input interdigital transducer, a non-leaky elastic wave is excited in the piezoelectric substrate owing to the existence of the cap. The non-leaky elastic wave is detected at the output interdigital transducer as a delayed electric signal, which is amplified via the amplifier. A signal part of an amplified electric signal is fed back to the first input interdigital transducer, again.

Abstract: An electric-current sensing device comprises an input ultrasonic transducer assembly, an output ultrasonic transducer assembly and an ultrasonic fiber between the two assembly. The input ultrasonic transducer assembly consists of an input piezoelectric vibrator, a driving electrode, an input ground electrode and an input vibrating plate. The output ultrasonic transducer assembly consists of an output piezoelectric vibrator, a detecting electrode, an output ground electrode and an output vibrating plate. When an input electric signal is applied to the input piezoelectric vibrator through the driving electrode and the input ground electrode, the input piezoelectric vibrator is acoustically vibrated. An acoustic vibration in the input piezoelectric vibrator is transmitted to the output piezoelectric vibrator, and detected between the detecting electrode and the output ground electrode, as a delayed electric signal.

Abstract: A vibration displacement detecting system comprises a piezoelectric substrate, input- and output interdigital transducers formed on an upper end surface of the piezoelectric substrate, a signal analyzing unit connected between the input- and output interdigital transducers, and a monitor. When an input electric signal is applied to the input interdigital transducer, a leaky elastic wave is excited in the piezoelectric substrate. The leaky elastic wave is radiated effectively in the form of a longitudinal wave into a matter being in contact with a lower end surface of the piezoelectric substrate. The longitudinal wave is reflected by a thing located inside the matter, and then, is detected at the output interdigital transducer as a delayed electric signal. If the thing vibrates mechanically, the delay time of the delayed electric signal changes.

Abstract: A piezoelectric signal converter comprises a piezoelectric ceramic, four electrodes P.sub.A, P.sub.B, Q.sub.C and Q.sub.D, a load resistance R consisting of N parts R.sub.i (i=1, 2, . . . , N), N-1 terminals T.sub.i {i=1, 2, . . . , (N-1)} between two parts R.sub.i and R.sub.(i+1), and two terminals T.sub.0 and T.sub.N, formed on the electrodes Q.sub.C and Q.sub.D, respectively. The electrodes P.sub.A, P.sub.B, Q.sub.C and Q.sub.D are formed on four side surfaces A, B, C and D, of the piezoelectric ceramic, respectively. The load resistance R is connected between the terminals T.sub.0 and T.sub.N. The piezoelectric ceramic, the electrodes P.sub.A, P.sub.B, Q.sub.C and Q.sub.D, form a piezoelectric vibrator. When a high-frequency electric signal E.sub.IN with a voltage V.sub.IN is applied to the electrodes P.sub.A and P.sub.B, the piezoelectric vibrator is vibrated at a frequency approximately equal to the resonance frequency of the piezoelectric ceramic.

Abstract: A surface acoustic wave position-sensing device comprising a piezoelectric substrate, a nonpiezoelectric plate and an interdigital transducer formed on one end surface of the piezoelectric substrate. The piezoelectric substrate is mounted on an upper end surface of the nonpiezoelectric plate through the interdigital transducer. When using the surface acoustic wave transducing device as an input device, an electric signal is applied to the interdigital transducer. In this time, a surface acoustic wave is excited in the piezoelectric substrate, and then transmitted to the upper end surface of the nonpiezoelectric plate. When using the surface acoustic wave transducing device as an output device, a surface acoustic wave transmitted from the upper end surface of the nonpiezoelectric plate to the piezoelectric substrate is transduced to an electric signal at the interdigital transducer.

Abstract: An ultrasonic touch-position sensing device comprising a piezoelectric substrate, an input interdigital transducer T formed at the middle of a lower end surface of the piezoelectric substrate, four output interdigital transducers R.sub.1, R.sub.2, R.sub.3 and R.sub.4, a nonpiezoelectric plate, and a signal controller connected with output terminals of the output interdigital transducers. The interdigital transducers R.sub.1 and R.sub.2, are formed at one edge of the lower end surface of the piezoelectric substrate, and the interdigital transducers R.sub.3 and R.sub.4, are formed at the other edge thereof. Each output interdigital transducer is placed such that the finger direction thereof is slanting to that of the interdigital transducer T. A lower end surface of the nonpiezoelectric plate is cemented on an upper end surface of the piezoelectric substrate, causing a bilayer assembly. An upper end surface of the nonpiezoelectric plate consists of four areas S.sub.1, S.sub.2, S.sub.3 and S.sub.4.

Abstract: An ultrasonic touch-position sensing device comprises a nonpiezoelectric plate, two ultrasonic transducing units mounted on an upper- or a lower end surface of the nonpiezoelectric plate, and a signal controller connected with the ultrasonic transducing units. Each ultrasonic transducing unit consists of a first- and a second piezoelectric substrates, at least an input interdigital transducer and at least an output interdigital transducer. The output interdigital transducer has at least a finger-overlap zone R.sub.i (i=1). The finger-overlap zone R.sub.i comprises zones R.sub.ia, R.sub.ib and R.sub.im. The finger direction of the zones R.sub.ia and R.sub.ib runs parallel with that of the input interdigital transducer. The finger direction of the zone R.sub.im is slanting to that of the input interdigital transducer. When an electric signal is applied to the input interdigital transducer, an ultrasound is excited in the bilayer zone B.sub.

Abstract: An ultrasonic touch-position sensing device comprises a piezoelectric substrate, two ultrasonic transducing units formed on an upper end surface of the piezoelectric substrate, and a signal controller connected with the ultrasonic transducing units. Each ultrasonic transducing unit consists of at least an input interdigital transducer and at least an output interdigital transducer. The output interdigital transducer has at least a finger-overlap zone R.sub.i (i=1). The finger-overlap zone R.sub.i comprises zones R.sub.ia, R.sub.ib and R.sub.im. The finger direction of the zones R.sub.ia and R.sub.ib runs parallel with that of the input interdigital transducer. The finger direction of the zone R.sub.im is slanting to that of the input interdigital transducer. When an electric signal is applied to the input interdigital transducer, an ultrasound is excited in the piezoelectric substrate, and transduced to electric signals E.sub.ia and E.sub.ib (i=1, 2, . . . , N) at the zones R.sub.ia and R.sub.

Abstract: A self-oscillation type signal converter includes a piezoelectric ceramic, four electrodes P.sub.A, P.sub.B, Q.sub.C and Q.sub.D, a load resistance R consisting of N parts R.sub.i (i=1, 2, . . . , N), N-1 terminals T.sub.i {i=1, 2, . . . , (N-1)} between two parts R.sub.i and R.sub.(i+1), two terminals T.sub.0 and T.sub.N, formed on the electrodes Q.sub.C and Q.sub.D, respectively, a switch, a vibration circuit connected between the electrodes P.sub.A and P.sub.B, and a rectification circuit connected between two of all the terminals T.sub.0, T.sub.i and T.sub.N, via the switch. The electrodes P.sub.A, P.sub.B, Q.sub.C and Q.sub.D are formed on four side surfaces A, B, C and D, of the piezoelectric ceramic, respectively. The load resistance R is connected between the terminals T.sub.0 and T.sub.N. The piezoelectric ceramic, the electrodes P.sub.A, P.sub.B, Q.sub.C and Q.sub.D, form a piezoelectric vibrator. When a high-frequency electric signal E.sub.IN with a voltage V.sub.IN is applied to the electrodes P.

Abstract: An ultrasonic switching device comprising a piezoelectric substrate, an input- and an output interdigital transducers formed on an upper end surface of the piezoelectric substrate, and a nonpiezoelectric plate, a lower end surface of the nonpiezoelectric plate being cemented on the upper end surface of the piezoelectric substrate. The output interdigital transducer has a finger-overlap zone R.sub.i (i=1), or has N finger-overlap zones R.sub.i (i=1, 2, . . . , N) and N-1 finger-overlap zones Q.sub.i {i=1, 2, . . . , (N-1)} between two finger-overlap zones R.sub.i and R.sub.(i+1). Each finger-overlap zone R.sub.i comprises three zones R.sub.ia, R.sub.ib and R.sub.im. The finger direction of the zones R.sub.ia and R.sub.ib runs parallel with that of the input interdigital transducer. The finger direction of the zone R.sub.im is slanting to that of the input interdigital transducer by an angle .alpha.. The finger direction of the finger-overlap zone Q.sub.

Abstract: An ultrasonic switching device comprises a piezoelectric substrate, and an input- and an output interdigital transducers formed on an upper end surface of the piezoelectric substrate. The output interdigital transducer has a finger-overlap zone R.sub.i (i=1), or has N finger-overlap zones R.sub.i (i=1, 2, . . . , N) and N-1 finger-overlap zones Q.sub.i {i=1, 2, . . . , (N-1)} between two finger-overlap zones R.sub.i and R.sub.(i+1). Each finger-overlap zone R.sub.i comprises zones R.sub.ia, R.sub.ib and R.sub.im. The finger direction of the zones R.sub.ia and R.sub.ib runs parallel with that of the input interdigital transducer. The finger direction of the zone R.sub.im is slanting to that of the input interdigital transducer by an angle .alpha.. The finger direction of the finger-overlap zone Q.sub.i is slanting to that of the input interdigital transducer by an angle .+-..beta..

Abstract: An ultrasonic material constant measuring system comprising a reference unit, an examination unit, at least a case equipped in at least the examination unit, and a signal processing unit. The reference unit consists of at least an input ultrasonic transducer T.sub.o and at least an output ultrasonic transducer R.sub.o. The examination unit consists of at least an input ultrasonic transducer T.sub.s and at least an output ultrasonic transducer R.sub.s. The case is placed between the ultrasonic transducers T.sub.s and R.sub.s. The signal processing unit is connected with output terminals of the ultrasonic transducers R.sub.o and R.sub.s. When electric signals are applied to the ultrasonic transducers T.sub.o and T.sub.s, ultrasounds are emitted in air from the ultrasonic transducers T.sub.o and T.sub.s, respectively, and then received by the ultrasonic transducers R.sub.o and R.sub.s, respectively. If at least a sheet of paper is placed in case 1, the ultrasound emitted from ultrasonic transducer T.sub.

Abstract: An SH wave position-sensing device comprising two SH wave transducing units X and Y, a nonpiezoelectric plate and a signal controller. Each unit contains piezoelectric substrates P.sub.T0, P.sub.R0, P.sub.Ti (i=1, 2, . . . , N) and P.sub.Ri (i=1, 2, . . . , N), interdigital transducers T.sub.0, R.sub.0, T.sub.i (i=1, 2, . . . , N) and R.sub.i (i=1, 2, . . . , N). The interdigital transducers T.sub.0, R.sub.0, T.sub.i and R.sub.i, are formed on an upper- or a lower end surface of the piezoelectric substrates P.sub.T0, P.sub.R0, P.sub.Ti and P.sub.Ri, respectively. The lower end surface of each piezoelectric substrate is cemented on an upper end surface of the nonpiezoelectric plate. The finger direction of each interdigital transducer R.sub.i is slanting to that of each interdigital transducer T.sub.i. When an electric signal is applied to the interdigital transducer T.sub.0, an SH wave is excited in a bilayer zone B.sub.T0 formed by the piezoelectric substrate P.sub.

Abstract: An elastic wave position-sensing device comprising at least two elastic 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, a display panel mounted on one end surface of the 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. Each piezoelectric substrates mounted on one or the other end surface of the nonpiezoelectric plate and the nonpiezoelectric plate form N bilayer zones L.sub.Ti (i=1, 2, . . . , N), a bilayer zone L.sub.R, and a monolayer zone between the bilayer zones L.sub.Ti and the bilayer zone L.sub.R. When an electric signal E.sub.

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.

Abstract: An ultrasonic touch-position sensing device comprising a piezoelectric substrate, two surface acoustic wave transducing units X and Y, and a controlling system connected with the units X and Y. The unit X includes interdigital transducers T.sub.X and R.sub.X, and the unit Y includes interdigital transducers T.sub.Y and R.sub.Y on the upper end surface of the substrate. When an electric signal is applied to each of the interdigital transducers T.sub.X and T.sub.Y, a surface acoustic wave is excited on the upper end surface of the substrate. The surface acoustic wave excited by the interdigital transducer T.sub.X and that excited by the interdigital transducer T.sub.Y are transduced to electric signals E.sub.Xi (i=x, . . . , 2, 1, 0, -1, -2, . . . , -x) and E.sub.Yj (j=y, . . . , 2, 1, 0, -1, -2, . . . , -y), respectively. If touching a crossing point made from the position F.sub.Xx and F.sub.Yy, the electric signals E.sub.X-x and E.sub.Y-y are delivered from the interdigital transducers R.sub.X and R.sub.

Abstract: A surface acoustic wave position-sensing device comprising two surface acoustic wave transducing units, a nonpiezoelectric plate and a controlling system connected with the units. Each unit consists of two piezoelectric substrates, a first group of interdigital transducers (IDTs) and a second group of interdigital transducers (IDTs). The second group of the IDTs is placed such that the finger direction thereof is slanting to that of the first group of the IDTs by an angle .alpha.. The thickness of each piezoelectric substrate is smaller than an interdigital periodicity of the IDTs. The thickness of the nonpiezoelectric plate is larger than three times the interdigital periodicity. When an electric signal is applied to the first group of the IDTs, a SAW is excited in one of the piezoelectric substrates and transmitted to the other of the piezoelectric substrates through the upper end surface of the nonpiezoelectric plate.

Abstract: A surface acoustic wave position-sensing device comprising a piezoelectric substrate, a nonpiezoelectric plate, two surface acoustic wave transducing units and a controlling system connected with the units. Each unit consists of interdigital transducers (IDTs). The thickness of the piezoelectric substrate is larger than three time an interdigital periodicity of the IDTs. The thickness of the nonpiezoelectric plate is smaller than the interdigital periodicity. Each of the IDTs is placed such that the finger direction thereof is slanting to that of the IDTs by an angle .alpha.. When an electric signal is applied to each of the IDTs a SAW is excited on an area, and transmitted to an area, in contact with the IDTs of the upper end surface of the piezoelectric substrate through the nonpiezoelectric plate. The controlling system senses a touch with a finger by the generation of the electric signal at one of the interdigital transducers.

Abstract: An elastic wave position-sensing device comprising a piezoelectric substrate, an input interdigital transducer T formed on an upper end surface of the piezoelectric substrate, and an output interdigital transducer R formed on the upper end surface of the piezoelectric substrate such that the finger direction of the interdigital transducer R is slanting to that of the interdigital transducer T by an angle .alpha.. The thickness d of the piezoelectric substrate is smaller than an interdigital periodicity P of the interdigital transducer T. An interdigital periodicity P.sub.N along the vertical direction to the finger direction of the interdigital transducer R is equal to the product of the interdigital periodicity P and cos .alpha.. An overlap length L.sub.P along the finger direction of the interdigital transducer R is equal to the product of an overlap length L of the interdigital transducer T and sec .alpha..