JPS6052199A - Ring-like piezoelectric vibrator - Google Patents

Abstract

PURPOSE:To improve the Q at radial vibration by bonding a piezoelectric body and an elastic body in series along a circle to constitute them as ring-like. CONSTITUTION:The direction of the polarization of two piezoelectric vibrators 11 and 12 subject to polarized processing between electrodes provided on both faces and having square form of 5mm. X 5mm. having a thickness of 2mm. is made opposite, four aluminum electrode terminal plates 3 having a cross section area of 5mm. X 5mm. and a thickness of 1mm. are formed and they are bonded in sandwich, they are bonded with four aluminum-made ring-like vibrators 2 of circular arc form having a cross section area of 5mm. X 5mm. and a length of nearly 27mm. so as to form a ring-like vibrator as shown in Fig. The four terminal plates 3 and the four ring-like vibrators 2 are connected respectively by leads 4 and 5, an AC signal of nearly 20kHz and 10V is impressed between the leads 4 and 5 and then the vibrators are resonated while adjusting the frequency, then a strong vibration is produced to the ring, which gives a fugitive touch when touched by a hand as if the ring slipped. This is because the ring is vibrated radially with an amplitude of several tens of mum.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement of piezoelectric vibrators in the radial direction, and an object of the present invention is to provide a resonator with a high Q for obtaining a large amplitude in the radial direction.

Conventionally, piezoelectric materials such as crystal oscillators have been used as resonance systems with high Q for frequency standardization. On the other hand, in the field of ultrasonic technology, the high energy density of mineral piezoelectric resonance systems has been utilized in processing technology. However, underwater ultrasonic vibrations exhibit the characteristics of small amplitude and high frequency.In order to obtain in-begence matching between the ceramic of the vibrator and the water, a vibrator made of aluminum or other material several times the size of the ceramic is used. We have been trying to increase P by intervening. As mentioned above, it is not possible to obtain amplitude characteristics with a single piezoelectric resonator, so the characteristics are improved by using a composite resonator with a radial resonator. The lack of a composite oscillator was a technical flaw.

The present invention overcomes the deficiencies of the prior art described above, and achieves the object by using a ring-shaped piezoelectric vibrator in which a piezoelectric body and an elastic body are arranged and combined along the same position. Embodiments of the present invention will be described below with reference to the drawings, but in order to aid understanding of the embodiments, the advantages of the pitched oscillator described above will be described first.

FIG. 1 shows a composite vibrator consisting of a piezoelectric vibrator 1 and an elastic body 2 such as aluminum or iron having a high mechanical quality factor Q against high frequency vibration, and its characteristic diagram.

The piezoelectric vibrator 1 is polarized in the polarization direction indicated by the arrow,
Electrodes are attached to the joint surface with the vibrator 2 and the opposite surface, respectively. When an alternating current voltage is applied between these electrodes and the frequency matches the resonant frequency, the amplitude of the vibrator reaches its peak. Diagram 01+ at the bottom of Figure 1 shows the relationship between the amplitude U and stress T of each part of the vibrator at this time.Since the stress T is large in ceramic, but the amplitude U is small, it was made only of ceramic. This shows that the composite vibrator shown in FIG. 1 can generate a larger amplitude than the resonator.

Utilizing this source of amplitude amplification in the complex oscillator,
We have invented a radial vibrator, and examples thereof will be described below.

Embodiment 1 FIG. 2 is a perspective view showing an embodiment of the ring-shaped piezoelectric vibrator of the present invention.

A ring-shaped piezoelectric body with an inner diameter of 30 mm, an outer diameter of 40 mm, and a height of 5 mrn is divided radially into approximately 60 parts, that is, the thickness is
It has a square shape of 5 companies x 5 battles with a diameter of 1 mm.
1. Electrodes are provided on the two specific gravity oscillators 11 and 12, which are polarized in the same manner as the electrodes, and the direction of polarization is reversed to form an aluminum electrode terminal plate 3 with a thickness of 1 and a cross-sectional area of 5 mm x 5 mm. These were joined together with a ring-shaped vibrator 2 of 4 Al Elfs (with a cross-sectional area of 5 mm x 5 mm and a length of approximately 27 mm), as shown in Fig. 2. I made a ring-shaped vibrator. 4 terminal boards 317
1 and the four ring-shaped vibrators 2 are connected by lead wires 4, respectively.
and connect at 5, about 20 KIfz between 4 and 5
When I applied 10 volts of my father's current to the ring and made it resonate while adjusting the frequency, the ring produced strong vibrations, and when I touched it with my hand, I felt an elusive and strange feeling, as if it were slipping. This seems to be because the ring vibrates in the radial direction with an amplitude of several tens of μm.

It goes without saying that the elastic bodies used in this specification include metals such as aluminum, iron, stainless steel, and duralumin H5T copper, as well as synthetic resins as long as they are materials with a large vibration Q. Further, the ring shape used in Specification i: refers to a symmetrical diagram J1> in which a circle, a circle, a straight line, and a curved line are combined in a two-dimensionally unified manner.

As explained above, since the piezoelectric body and the elastic body are connected in series along the circumference and configured in a ring shape, the Q in the radial direction vibration is high, and when the D vibration is performed at the resonant frequency, the vibration state is large in amplitude. It was possible to provide a ring-shaped composite resonator with a large amplitude, and it was possible to provide a ring-shaped composite resonator with a large amplitude. By selecting the material of the elastic body, the forward direction of the vibrator can be lengthened, frequency changes over time, and temperature changes.

Another great advantage of the composite oscillator is that it is possible to obtain a highly reliable and stable oscillator with almost no oscillations.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the principle of compound & mover, which is the original form of the present invention (
Fig. 2 is a perspective view showing an embodiment of the ring-shaped pressure 71L vibrator according to the present invention. 1.11% 12.2...Piezoelectric vibrator applicant Hitachi Maxell Co., Ltd. representative Mizui [zo 2,, 1 fig gr 2 fig.

Claims (1)

[Claims] A piezoelectric vibrator 0 characterized in that a piezoelectric body and an elastic body are joined in series along the circumference to form a ring shape.