JPS6119317B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises an ultrasonic vibrator having a structure in which a piezoelectric element is bonded to the bottom of an aquarium via an insulating plate, and an oscillation circuit for driving this ultrasonic vibrator. This product relates to an ultrasonic cleaner that uses the bending vibration mode of a vibrator to emit ultrasonic waves of approximately 30 to 60 KHz into liquid to clean objects. Improved insulation plates enable highly reliable ultrasonic cleaning. It is an attempt to provide a vessel.

Conventionally, as shown in FIG. 3, a metal foil 4 such as copper foil is provided on at least one side and on almost the entire surface except for the periphery as shown in FIG. An insulating plate 3 made of a glass-based epoxy resin plate or the like is adhered with an insulating adhesive 6, and further, as shown in FIG. The piezoelectric element 1 provided with the electrodes 2 and 2' is bonded with an insulating adhesive 7, and the lead wires 8 and 8' are connected to the metal foil 4' of the insulating plate 3 and the electrode 2 of the piezoelectric element 1, respectively.
It was constructed by soldering to. The electrical signal to the piezoelectric element 1 is applied by the lead wires 8, 8' because the electrode 2' of the piezoelectric element 1 and the metal foil 4 of the insulating plate 3 are electrically connected by point contact due to the thin adhesive layer 7. and causes vibration. However,
The adhesive layer 7 is thin, with an average thickness of 3 to 10 μm, and although the piezoelectric number and the metal foil of the insulating plate are partially electrically connected due to point contact, it can be used at high temperatures and with high input power. When operated, there was a drawback that the point contact was broken due to the softening of the insulating adhesive 7 and vibration amplitude, resulting in an open state and no operation.

Therefore, the present invention aims to eliminate this drawback, and one embodiment of the present invention will be described below. The feature of this embodiment of the present invention is that, as shown in FIG. 4, the shape of the metal plate 10 provided on the insulating plate 9 is radial. The insulating plate 9 has a metal foil 10 on at least one side, and the shape of the metal foil on the surface to be bonded to the piezoelectric element extends radially from the center to the periphery. In other words, it has grooves. The other configuration is the same as the conventional one, as shown in FIG.

As described above, according to the present invention, since the metal foil has a shape that extends radially from the center toward the periphery, when the piezoelectric element and the insulating plate are bonded together,
The adhesive layer itself is not much different from conventional products, but there is a groove on the insulating plate that has no metal foil and extends toward the periphery, so the adhesive passes through this groove and protrudes to the periphery, resulting in The adhesive layer between the metal foil and the electrode of the piezoelectric element becomes extremely thin, ensuring that
Electrical conduction occurs through contact, and adhesive strength is maintained in the groove portion without metal foil, resulting in stable operation and high reliability even at high temperatures and high input power. This effect is usually caused by metal foil such as copper foil provided on the insulating board.
A thickness of approximately 10 to 60 μm is used, and the thicker the metal foil and the larger the area of the groove (however, less than half), the more significant the problem becomes.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a piezoelectric element, Fig. 2 is a perspective view showing a conventional insulating plate, Fig. 3 is a sectional view of a conventional ultrasonic cleaner, and Fig. 4 is an ultrasonic cleaner according to the present invention. FIG. 2 is a perspective view showing the main parts of an embodiment of the container. 5... Water tank, 6, 7... Adhesive, 1... Piezoelectric element, 9... Insulating substrate, 10... Metal foil.

Claims (1)

[Claims] 1 An insulating plate that is equipped with an aquarium, an insulating plate that is adhered to the bottom back surface of the aquarium and has metal foil on at least one side, and a piezoelectric element that is adhered to the metal foil surface of the insulating plate, and that faces the piezoelectric element. An ultrasonic cleaner with metal foil shaped radially from the center to the periphery.