JPS5828772B2 - Ultrasonic logic operation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic logical operation device that extracts a ternary signal using an ultrasonic conversion method that converts an electric signal into an ultrasonic wave or an ultrasonic wave into an electric signal.

Transducers that convert electrical signals into ultrasound waves or ultrasound waves into electrical signals are important elements in ultrasound devices, but current transducers or ultrasound conversion methods only generate two direct signals. Common.

In addition, in the current fields of electronic engineering and ultrasound, logic arithmetic devices that handle binary information are common and are making significant progress, but applications to ternary logic and other multivalued logic are This is an unexplored field.

SUMMARY OF THE INVENTION An object of the present invention is to provide an ultrasonic logic operation device that extracts a ternary signal using an ultrasonic conversion method.

The present invention will be explained below with reference to the drawings.

FIG. 1 is a perspective view illustrating an ultrasonic conversion type transducer which is the basis for realizing the ultrasonic logical operation device of the present invention.

In the figure, a pair of interdigital electrodes 3 and 4 are formed on one surface 2 of a thin plate-like piezoelectric body 1.

Further, the interdigital electrode 3 is provided on the other surface 5 of the piezoelectric body 1.
, 4 are formed with surface electrodes 6 corresponding to them.

The - set of interdigital electrodes 3.4 have terminals A, respectively.
A terminal O is drawn out from the surface electrode 6.

Then, the terminal A is connected to the terminal with the terminal O as the grounding terminal.
A phase shifter (not shown) is grounded in order to independently apply electrical signals having a phase difference of 180 degrees to terminal B and terminal B.

As the transfer device, a currently used phase shifter of an IC element or the like can be used.

With this configuration, input signals having a phase difference of 1800 at the same time can be input to the terminals A-0. When applied to the combination of the two sets of electrodes at terminal B-0, the waves excited in each part are added in phase and an extremely large output signal is obtained.

FIG. 2 is a block diagram of a three-value logic logic operation device (three-value logic device) using the ultrasonic conversion method using the transducer of FIG.

In the figure, the input terminals are formed so that input signals S and S, whose phases have been changed by 1800 degrees using a phase shifter or the like, are applied independently between terminals A-0 and B-0, respectively.

That is, for input signals S (or S) and O,
The output signal is 2S (i.e. S+8), S (or S)
, O is constructed.

FIG. 3 is a plan view showing the configuration of a more specific ultrasonic logic operation device (ternary logic device).

In the figure, the ternary logic device is Tokyo Denki Kagaku K.
On one side of a piezoelectric ceramic 91A material (polarized in the thickness direction) made by K, two sets of interdigital electrodes as shown in Figure 1, with electrode fingers and electrode spacing of 75 μm, are installed for input and output. Established.

In addition, plane electrodes were provided on the other side so as to correspond to each other, thereby constructing an input/output transducer.

The electrodes were formed by vapor deposition of At.

The output transducer was grounded by shorting terminals B/ and O', and A'-0' was used for output.

The output voltage at a frequency of 12.8 MHz was 5:3 as a relative output ratio between when the S1 terminal BKS was applied to the terminal A at the same time and when S or only S was applied.

That is, the output signal can be used as a three-valued logic device in which three values of 28 (S+S), 5(S), and O are obtained for the input signals S (S) and O.

In the transducer used here, good results have been obtained using Lamb waves when a thin piezoelectric material is used as the substrate, but for example, when a piezoelectric thin film such as CdS or ZnO is used as a substrate, a piezoelectric thin film such as CdS or ZnO is When installed on a non-piezoelectric substrate,
Surface acoustic waves are used, and similar effects can be achieved in this case as well.

As described above, the present invention interdigitally forms a pair of interdigital electrodes on one surface of a thin piezoelectric material, and a surface electrode corresponding to the interdigital electrodes on the other surface of the piezoelectric material. forming a first input terminal between one of the interdigital electrodes and the surface electrode; a second input terminal between the other interdigital electrode and the surface electrode; A pair of other interdigital electrodes are formed interdigitally, and another surface electrode is formed on the other surface of the piezoelectric body so as to correspond to the other interdigital electrode, and another surface electrode is formed on the other surface of the piezoelectric body to correspond to the other interdigital electrode. Another surface electrode is short-circuited and grounded, one of the other interdigital electrodes and another surface electrode is used as an output terminal, and a first input terminal is connected to the first input terminal and the second input terminal, respectively.
A second input signal having a phase difference of 180 degrees from the first input signal, or no signal is applied, and a ternary signal is extracted from the output terminal according to the combination. It is an ultrasonic logic operation device with excellent conversion efficiency and extremely large output voltage.
A highly effective ternary logic device is obtained.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram illustrating a transducer of the ultrasonic conversion method which is the basis for realizing the ultrasonic logical operation device of the present invention, and Fig. 2 shows the ultrasonic conversion method using the transducer of Fig. 1. FIG. 3 is a block diagram of the ternary logic device used, and is a plan view showing the specific configuration of the ultrasonic logic operation device of the present invention. 1... Thin plate-like piezoelectric material, 2... One side, 3.4...
- Interdigital electrode, 5...other surface, 6... surface electrode,
A. A', B, B', 0.0'...terminals.

Claims (1)

[Claims] 1 A pair of interdigital interdigital electrodes are formed on one surface of a thin piezoelectric material, a surface electrode is formed on the other surface of the piezoelectric material in correspondence with the interdigital electrodes, and A first input terminal is between one side and the surface electrode, and a second input terminal is between the other side of the interdigital electrode and the surface electrode;
A pair of other interdigital electrodes are interdigitally formed on one surface of the piezoelectric body at another position, and another surface electrode is formed on the other surface of the piezoelectric body so as to correspond to the another interdigital electrode. the other interdigital electrode and another surface electrode are short-circuited and grounded, the one of the other interdigital electrodes and the other surface electrode are used as an output terminal, and the first input terminal and A first input signal, a second input signal having a phase difference of 180 degrees from the first input signal, or no signal is applied to the second input terminal, respectively, and the output terminal is output from the output terminal according to the combination. An ultrasonic logic operation device characterized by extracting a three-value signal.