JPH01229515A - Piezoelectric body for ultrasonic delay line - Google Patents

Abstract

PURPOSE:To form a piezoelectric body for ultrasonic delay lines without characteristic degradation due to resonance by adhering an input part and an output part together with an oscillation absorber between, and forming them into one body. CONSTITUTION:A piezoelectric body base material is formed by pasting two piezoelectric bodies 1a and 1b by resin layers with an oscillation absorber 2 made of material through which it is hard to propagate oscillation. Plate piezoelectric bodies 1a and 1b are adhered on the input/output face of a glass medium 3 through which ultrasonic waves are propagated with an electrode film and a resin layer between. Since the piezoelectric bodies 1a and 1b respectively in charge of input and output are formed into one plate like this, it can be efficiently and easily adhered on the small input/output face of the glass medium 3, and since it is adhered with the oscillation absorber 2 through which it is hard to propagate the oscillation between, the resonance can be prevented and the piezoelectric body for the ultrasonic delay lines whose characteristic is not be degraded can be obtained.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a piezoelectric material for an ultrasonic delay line that is installed as an electroacoustic transducer for inputting and outputting an ultrasonic delay line used in electronic video equipment, etc. More specifically, the present invention relates to a piezoelectric body for an ultrasonic delay line in which an input section and an output section are formed into one piece.

(Prior Art) Generally, an ultrasonic delay line sends and receives signals using a piezoelectric material attached to the input/output surface of a glass medium as an electroacoustic transducer. Conventionally, this signal transmission and reception has been accomplished by pasting two piezoelectric bodies, or by cutting the electrodes by inserting a center slit, and pasting one piezoelectric body with independent input and output parts.

(Problem to be Solved by the Invention) However, in the above configuration, since the input/output surface of the glass medium to which the piezoelectric body is attached has a narrow area, it is difficult to effectively attach two piezoelectric bodies. However, in the case of a single piezoelectric material having a center slit, a portion receiving an input signal and a portion receiving an output signal resonate, resulting in deterioration of characteristics.

The present invention solves the above-mentioned problems and provides a piezoelectric material for an ultrasonic delay line that can be effectively attached to a narrow input/output surface and is free from characteristic deterioration due to resonance.

(Means for Solving the Problems) In order to solve the above problems, the present invention combines two blocks of piezoelectric bodies with a vibration absorber made of a material that does not easily propagate vibrations and adheres them to form one block of piezoelectric bodies. It is something.

(Function) With the above configuration, the piezoelectric material can be easily attached to the narrow input/output surface of the glass medium, and the resonance between the input and output parts is softened by the vibration absorbing material that does not easily propagate vibrations, thereby reducing the characteristic deterioration. can be prevented.

(Example) An example of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing a base material of a piezoelectric material for an ultrasonic delay line according to the present invention, and shows a state before slicing into thin plates. 1b is attached with a resin layer (not shown) sandwiching a vibration absorbing material 2 made of a material that does not easily propagate vibrations.

FIG. 2 is a perspective view of an ultrasonic delay line equipped with a plate-shaped voltage body obtained by slicing the piezoelectric base material described above. In the figure, a piezoelectric plate is attached to the human output surface of a glass medium 3 through which ultrasonic waves propagate through an electrode film and a resin layer (both not shown).

The above electrode film serves as one electrode of the piezoelectric bodies 1a and 1b, and lead wires 4a and 4b are connected to the piezoelectric bodies 1a and 1b as the other electrode. In addition,
The lead wires 4a and 4b are connected to the piezoelectric bodies 1a and 1.
It is connected to the surface of b using conductive adhesives 5a and 5b.

The operation of the ultrasonic delay line piezoelectric body configured in this way will be explained.

First, an input signal that enters through the lead wire 4a is transmitted to the piezoelectric body 1.
The ultrasonic waves are converted into ultrasonic waves by a, propagate through the glass medium 3, and after being reflected multiple times, reach the piezoelectric body 1b. The piezoelectric body 1b converts the ultrasonic waves into electric signals again and outputs them.

(Effects of the Invention) As explained above, according to the present invention, the piezoelectric bodies each responsible for input and output are configured in one piece, so it can be applied effectively and easily to the narrow input and output surface of a glass medium. Not only is it possible to do this, but since it is bonded through a vibration absorbing material that does not easily propagate vibrations, resonance can be prevented.
A piezoelectric material for an ultrasonic delay line whose characteristics do not deteriorate can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a base material of a piezoelectric material for an ultrasonic delay line according to the present invention, and FIG. 2 is an enlarged perspective view of a main part showing an ultrasonic delay line to which the piezoelectric material for an ultrasonic delay line according to the present invention is attached. It is. la, lb...piezoelectric body, 2...vibration absorbing material, 3
...Glass medium, 4a, 4b...Lead wire,
5a, 5b... conductive adhesive. Patent applicant: Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] An ultrasonic piezoelectric material for an ultrasonic delay line that is attached to the input/output surface of a glass medium constituting the ultrasonic delay line, characterized in that the input part and the output part are bonded together via a vibration absorbing material and formed integrally. Piezoelectric material for delay line.