JPS61296899A - Ultrasonic oscillator - Google Patents

Abstract

PURPOSE:To make a packing layer thin and the size of an ultrasonic oscillator compact by forming the packing layer connected and disposed in a rear surface of a piezoelectric body in a laminating structure of a rubber layer and a sponge layer. CONSTITUTION:In a rear surface of a piezoelectric body 1 having electrode layers 11, 12 are formed on a front and a back surfaces, a packing layer 2 on which a rubber layer 21 and a sponge layer 22 are laminated is connected and disposed. As for the sponge layer 22, a sponge of a similar rubber to the rubber layer 21 is used and an ultrasonic reflection in an interface is reduced. Thereby, a strength of the packing layer 2 and an absorptivity of the ultrasonic wave can be improved by the sponge layer 22 and the rubber layer 21, so that the packing layer can be thinned and the ultrasonic oscillator can be made compact.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an ultrasonic vibrator applied to an ultrasonic distance meter, an ultrasonic thickness meter, or the like.

<Summary of the Invention> The present invention is constructed by bonding and disposing a packing layer consisting of a rubber layer and a sponge layer on the back surface of a piezoelectric body, thereby reducing the size of the vibrator, supporting it in the case, and absorbing ultrasonic waves. The aim is to improve the

<Summary of the Invention> Conventionally, as this type of ultrasonic transducer, there is one in which a banking layer 4 made of rubber or the like is bonded to the back surface of a piezoelectric body 3, as shown in FIG. 3, for example. The packing layer 4 absorbs the ultrasonic waves that travel backwards among the ultrasonic waves generated from both sides of the piezoelectric body 3, makes it easier for the ultrasonic waves to travel only in the forward direction, and also functions to support the piezoelectric body 3. .

However, in this type of packing N4, it is necessary to make the banking layer 4 somewhat thick in order to increase the absorption of ultrasonic waves, especially in a low frequency ultrasonic transducer.
This thickness tends to become even larger. On the other hand, as another method of increasing the ultrasonic absorbability, it is also possible to configure the packing layer 4 with a rubber sponge. In this case, since the rubber sponge is flexible, when supporting the ultrasonic transducer within the case, problems such as poor supportability occur.

<Object of the Invention> In view of the above-mentioned problems, an object of the present invention is to provide a novel ultrasonic transducer that can be miniaturized, and has improved ultrasonic absorption and support for a case. .

<Configuration and Effects of the Invention> In order to achieve the above object, in the present invention, the banking layer bonded to the back surface of the piezoelectric body is configured to have a laminated structure of a rubber layer and a sponge layer.

According to the above configuration, in this invention, the absorption of ultrasound waves can be increased by the sponge layer, and the strength of the packing layer can be increased by the rubber layer, thereby making it possible to form the packing layer thinly and downsizing the ultrasound transducer. It produces the effect of achieving the desired goal that can be realized.

<Explanation of Examples> FIG. 1 shows an ultrasonic transducer according to the present invention.

This ultrasonic vibrator has a packing layer 2 in which a rubber layer 21 and a sponge layer 22 are laminated on the back side of a piezoelectric body 1 on which electrode layers 11 and 12 are formed on the front and rear surfaces. uses a sponge made of rubber similar to Rubber N21, and considers reducing the reflection of ultrasonic waves at the interface.

FIG. 2 shows another embodiment of the invention. In this example, as in the previous example, a packing layer 2 is provided on the back surface of the piezoelectric body 1.
It has a multilayer structure in which rubber layers 21 and 212 are laminated on both sides of the sponge N22, and in this case, the directivity of the ultrasonic transducer is further improved.

As described above, the present invention provides a piezoelectric material l in an ultrasonic transducer.
Since the packing layer 2 bonded and arranged on the back side has a laminated structure of the rubber layer 21 and the sponge layer 22, the absorption of ultrasonic waves can be increased by the sponge layer 22, and the strength of the packing layer 2 can be increased by the rubber layer 21. Therefore, it is possible to make the packing layer 2 thinner, thereby achieving the desired purpose of reducing the size of the ultrasonic transducer and improving its support to the case.

[Brief explanation of the drawing]

FIG. 1 is a structural diagram of an ultrasonic transducer according to the present invention, FIG. 2 is a diagram showing a second embodiment, and FIG. 3 is a structural diagram of a conventional ultrasonic transducer.

Claims (1)

[Scope of Claims] 1. An ultrasonic transducer in which a packing layer is bonded to the back surface of a piezoelectric body, characterized in that the packing layer has a laminated structure of a rubber layer and a sponge layer. 2. The ultrasonic transducer according to claim 1, wherein the rubber layer and the sponge layer are made of the same material.