JPH05169028A - Method for bonding ultrasonic vibrator - Google Patents

Abstract

PURPOSE:To incorporate a metallic foil to uniformize the thickness of a bonding layer and to enhance the adhesive strength and continuity by incorporating plural metallic foils into the bonding part between an ultrasonic diaphragm and an ultrasonic vibrator and bonding the part except the metallic foil part with an adhesive. CONSTITUTION:An ultrasonic diaphragm 1 and the minus electrode of an ultrasonic vibrator 2 with the electrodes vertically divided are bonded with an adhesive so that a bonding layer 3 is uniformly formed. Plural metallic foils 4 of gold, etc., are incorporated into a part of the bonding layer 3, brought into contact with the diaphragm 1 and the vibrator 2 and bonded. As a result, since vibration is transmitted and an electric signal is supplied to the vibrator by the metallic foil, the diaphragm is more surely vibrated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of adhering an ultrasonic vibrator.

[0002]

2. Description of the Related Art Conventionally, an ultrasonic vibration plate having a piezoelectric element adhered thereto is provided in a device for transmitting vibration into air or liquid. Metals such as stainless steel, titanium, tantalum, brass, magnesium, and aluminum, resins such as polyvinyl chloride and polyvinylidene fluoride, and glass such as Pyrex and quartz have been used for the ultrasonic diaphragm. When the ultrasonic transducer is not a wrap-around electrode but is divided into upper and lower parts, bringing the lower electrode (minus) into contact with the ultrasonic diaphragm requires obtaining adhesive force on the one hand, and on the other hand, There is a reciprocal relationship because they must be joined and the electrical resistance must be reduced.

As shown in FIG. 2, the (-) electrode side of the ultrasonic vibrator 2 is brought into contact with the ultrasonic vibration plate 1 and the periphery is adhered to form an adhesive layer 3 with an adhesive. In the above-mentioned conventional example, although the electric resistance can be reduced, there is a drawback that the adhesive force is weak. In the case where the ultrasonic vibration plate 1 and the ultrasonic vibrator 2 shown in FIG. 3 are adhered to each other with an adhesive interposed to form the adhesive layer 3, the adhesive layer 3 becomes thicker when the adhesive force is increased. Therefore, the resonance frequency and the acoustic conversion efficiency decrease. Then, the ultrasonic transducer and the ultrasonic diaphragm are no longer in contact with each other. On the contrary, if they are brought into contact with each other, the adhesive hardly adheres and the adhesive force cannot be obtained. Further, as shown in FIG. 4, a part of the ultrasonic vibrator 2 is brought into contact with the ultrasonic diaphragm 1, and the other part is adhered with an adhesive so as to form the adhesive layer 3 in an inclined state. In the case of this example, uniform acoustic characteristics cannot be obtained.

[0004]

As described above, according to the conventional example, the thickness of the adhesive layer cannot be controlled, and especially at high frequencies, the thickness of the adhesive layer cannot be ignored and the characteristics cannot be obtained. For this reason, there are drawbacks such that adhesive strength cannot be obtained, electrode contact cannot be made, acoustic characteristics cannot be obtained, and defects occur. Further, when the ultrasonic vibration plate is made of resin or glass, the (-) electrode cannot be pulled out.
Therefore, in the present invention, by incorporating a metal foil, the adhesive layer thickness can be made constant, the (-) electrode can be brought into contact, and the adhesive force, conductivity, and acoustic characteristics can be improved. The purpose is to provide.

[0005]

In order to achieve the above-mentioned object, the present invention interposes a plurality of metal foils in contact with the ultrasonic vibration plate and the ultrasonic vibrator, and The ultrasonic vibrating plate and the ultrasonic vibrator are bonded by an adhesive so as to form a uniform adhesive layer.

[0006]

The present invention is configured as described above, and the metal foil transmits vibrations and supplies electric signals to the ultrasonic vibrator. Therefore, the lead wire of the ultrasonic generator is connected to the metal foil to serve as an electrode.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention will be described in detail with reference to FIG. 1. An adhesive layer 3 is provided between an ultrasonic vibration plate 1 and a negative electrode of an ultrasonic vibrator 2 whose upper and lower electrodes are divided. Are adhered with an adhesive so that they are uniformly formed. A plurality of metal foils 4, 4 ..., such as gold foils, are bonded to a part of the adhesive layer 3 so as to contact the ultrasonic vibration plate 1 and the ultrasonic vibrator 2.

This embodiment is constructed as described above,
Normally, one lead wire of the ultrasonic generator 5 is connected to the (+) electrode side of the ultrasonic vibrator 2, and the other lead wire is connected to the ultrasonic diaphragm 1. Then, the ultrasonic transducer 2 converts a signal from the ultrasonic generator 5 into electro-mechanical vibration, and the adhesive layer 3
Through the ultrasonic vibration plate 1 and is converted into sound. On the other hand, although the metal foil 4 transmits vibration, it contacts the (-) electrode of the ultrasonic transducer 2 and the ultrasonic vibration plate 1, and uses the ultrasonic vibration plate 1 as one electrode to connect the lead wire of the ultrasonic generator. They are connected and serve to supply an electric signal to the ultrasonic transducer 2. Therefore, when the ultrasonic vibration plate 1 is made of resin or glass, it has an insulating property, so that the metal foil can be directly drawn out to supply an electric signal.

[0009]

The present invention is constructed as described above,
By pouring a metal foil between the ultrasonic vibrator and the ultrasonic diaphragm, the thickness of the adhesive layer can be made uniform and uniform, and the adhesive force and the resonance frequency can be made uniform. Moreover,
The contact between the ultrasonic transducer and the ultrasonic vibration plate is surely performed,
The contact resistance can be reduced and an electric signal can be reliably supplied through the ultrasonic diaphragm. Therefore, the product obtained by this bonding method can be applied to a vibration unit or a speaker that reliably transmits vibration by obtaining the electrode contact and the adhesive force of the ultrasonic vibration plate. In particular, as a vibration unit having an extremely high resonance frequency, it is possible to suppress variations in the resonance frequency, improve quality, and have a wide range of applications.

[0010]

[Brief description of drawings]

FIG. 1 is a sectional view showing a method of bonding an ultrasonic transducer according to the present invention.

FIG. 2 is a sectional view of a conventional example.

FIG. 3 is a sectional view of a conventional example.

FIG. 4 is a sectional view of a conventional example.

[Explanation of symbols]

 1 Ultrasonic Vibration Plate 2 Ultrasonic Transducer 3 Adhesive Layer 4 Metal Foil 5 Ultrasonic Generator

Claims (1)

[Claims] 1. A uniform adhesive layer in which a plurality of metal foils are interposed so as to be in contact with the ultrasonic vibrating plate and the ultrasonic vibrator, and the ultrasonic vibrating plate and the ultrasonic vibrator in a portion excluding the metal foils are uniform. A method for adhering an ultrasonic transducer, characterized in that it is adhered with an adhesive so as to form