JPS60103710A - Ultrasonic wave delay line - Google Patents

Abstract

PURPOSE:To decrease the insertion loss by bonding a lead to an electrode formed on a glass delay medium with solder or conductive adhesives so as to prevent the solder or conductive adhesives from being a load mass. CONSTITUTION:One electrode 11a of a piezoelectric vibrator 10 is prolonged from one major plane of a piezoelectric porcelain plate to the end of the other major plane through one side face. In contacting closely a piezoelectric vibrator 10 to a prescribed position of the glass delay medium 3 and fixing them by an adhesives 8, the electrode 11a contacts with an electrode 12a and an electrode 11b contacts with an electrode 12b respectively and they are connected electrically. The electrode 12b is an electrode where the electrodes 11b of the two piezoelectric vibrators 10 contact in common. Furthermore, the lead 1 is bonded respectively to the electrodes 12a, 12b formed on the glass delay medium 3 by solder or conductive adhesives 6. Thus, the solder or the conductive adhesives 6 is not a load mass to the mechanical vibration of the piezoelectric vibrator 10 and then the energy converting efficiency is improved and the insertion loss is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an ultrasonic delay line, and more particularly to an improvement in its signal output section.

(Constitution of conventional example and its problems) A conventional ultrasonic delay line was constructed as shown in FIGS. 1@ and 2. In FIG. 1, 1 is an input/output lead wire, 2 is a piezoelectric vibrator that performs electrical-to-mechanical conversion of signals at the input section, and mechanical-to-electrical conversion at the output section, :i:I
Glass retardation medium 4 is unnecessary reflection absorption turbidity.

FIG. 2 is an enlarged view of section A in FIG. 1.

The piezoelectric vibrator 2 has a pair of opposing electrodes 5a on both sides thereof.
, 5b are respectively provided, and one electrode 5a is connected with a lead wire 1 by a conductive adhesive 6, and the other electrode 5b is connected to a glass retardation medium 3 with a lead wire 1 The adhesive 8 is electrically connected in close contact with the exposed electrode 7
It is fixed by.

Another lead wire 1 is connected to the electrode 7 with solder or conductive adhesive 6. Note that the electrode 5a.

5b and the electrode 7 are formed by a method such as plating, sparkling, vapor deposition, or the like.

In the conventional example configured in this way, an electrical signal applied to one piezoelectric vibrator 2 is converted into mechanical vibration, and while the mechanical vibration propagates through the glass delay medium 3, it is delayed by a predetermined time and then transmitted to the other piezoelectric vibrator. The signal reaches the piezoelectric vibrator 2, where it operates so as to be converted into an output electrical signal. However, in this configuration, 2. The solder or conductive adhesive 6 to which the lead wire 1 is bonded to one electrode 5a of the piezoelectric vibrator 2 acts as a load mass for mechanical vibrations, thus increasing the efficiency of electrical-mechanical or mechanical-electrical energy conversion. There were drawbacks such as lower insertion loss and increased insertion loss.

(Objective of the Invention) The present invention eliminates the drawbacks of the above-mentioned conventional examples, and uses solder or adhesive instead of 9. The object of the present invention is to provide an ultrasonic delay line that does not become a loaded mass and has reduced insertion loss.

(Structure of the Invention) In order to achieve the above object, both opposing electrodes of a piezoelectric vibrator are guided to an electrode formed on a glass retardation medium,
Connect a lead wire to an electrode on the medium, or
The counter electrode is extended to the side surface of the piezoelectric vibrator, and a lead wire is connected to that part.

As a result, the solder or conductive adhesive that connects the lead wires does not become a load mass.The following embodiment will be described in detail with reference to one drawing.

(Description of Embodiment) FIG. 3 shows an embodiment of the present invention, in which the same reference numerals as in FIG. Ila and Ilb are a pair of opposing electrodes provided on the piezoelectric vibrator 10, and 12a and 12b are electrodes provided on the glass delay medium 3. One electrode of the piezoelectric vibrator 10], ald extends from one main surface of the piezoelectric ceramic plate through one side and one part of the width of the other main surface. Therefore,
When the piezoelectric vibrator 10 is brought into close contact with the predetermined position of the hornless delay medium 3 and fixed with the adhesive 8, the electrode 11a is connected to the electrode 12.
a, and the electrode 11b contacts the electrode 12b nine times,
electrically connected.

Note that the electrode 12b is the electrode 11 of the two piezoelectric vibrators 1o.
b is the electrode in common contact. The lead wires 1 are electrodes 12a, ], 2b formed on the glass delay medium 3.
Then, they are slid together using half-moon adhesive or conductive adhesive 6, respectively.

In this embodiment configured as described above, the lead wire 1 is not directly connected to the electrode 11a as in the conventional example, but is led to the glass delay medium 3, and the electrode 12a is formed on the glass delay medium 3. Since the lead wire is connected to , 12b,
The solder or conductive adhesive 6 does not become a load mass for the vibration of the piezoelectric vibrator 100, thus improving energy conversion efficiency and reducing insertion loss by 1 to 1.5 dB.

FIG. 4 shows another embodiment of the present invention, in which a pair of opposing electrodes 14a and 14b shaped into a piezoelectric vibrator 13 are shown.
However, the electrode is L-shaped in cross section and is connected to the living surface of the piezoelectric ceramic plate and one side adjacent to the living surface, and
The electrode 12a shown in FIG. 3 is provided on the glass delay medium 3, and the lead wire 1 is connected to the side surface of the piezoelectric vibrator 13.

In the case of this embodiment as well, read i! j! The solder or conductive adhesive 6 for joining 1 does not become a load mass and can reduce insertion loss.

FIG. 5 shows still another embodiment of the present invention,
The common electrode 12b in FIG. 4 is divided into two, and the electrode 1
5a and 15b, and the input side and output side are completely separated. In this case as well, since the lead wires 1 are respectively bonded to the side surfaces of the piezoelectric vibrator 13, the solder or conductive adhesive 6 does not become a load mass.

(Effects of the Invention) As explained above, according to the present invention of the VC1, since the structure does not use solder or conductive adhesive for lead wire bonding as a load mass, the insertion loss characteristic of the ultrasonic delay line is 1 to 1. Improved by within 1.5 dB. In addition, when a conductive adhesive is used in the conventional example, there is a problem that the conductive adhesive drips onto the side of the piezoelectric vibrator, causing a short circuit with the other electrode or poor insulation. However, according to the configuration of the present invention, these problems can be solved all at once, and the characteristics and reliability can be improved at the same time.

[Brief explanation of the drawing]

FIG. 1 is a side view of the conventional example, FIG. 2 is an enlarged cross-sectional view of the signal input/output section, FIG. 3 is a cross-sectional view of the signal input/output section of an embodiment of the present invention, and FIG. FIG. 5 is a sectional view of the input/output section of other embodiments of the present invention. l ・・・・・・ Lead wire, 3 ・・・・・・・・・
Glass delay medium, 6...Solder or conductive adhesive, 8...Adhesive, 1 o, 1
3... Piezoelectric vibrator, lla, Ilb. ] 4 a, 14 b −=”” Electrodes of piezoelectric vibrator, 12 a, 12 b. ], 5a, 151) ...An electrode formed on a glass delay medium. Patent applicant Matsushita Electric Industrial Co., Ltd., -7...). Agent Koji Hoshino ・ ′・− Figure 1 Figure 2

Claims (1)

[Claims] In an ultrasonic delay line in which a piezoelectric vibrator is fixed on a glass delay medium to serve as a signal input/output section, a pair of opposing electrodes provided on the piezoelectric vibrator are extended to a side surface of the piezoelectric vibrator,
A lead wire is connected to the electrode on the side surface by soldering or a conductive adhesive, or the pair of opposing electrodes are electrically connected by contacting each electrode formed on the glass delay medium. , Q IJ- is applied to the electrode formed on the glass delay medium by soldering or conductive adhesive.
An ultrasonic delay line characterized by a bonded wire.