JPS5813669Y2 - Ultrasonic transducer unit - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an ultrasonic transducer unit used in medical equipment, etc., and attempts to improve sensitivity.

This type of conventional ultrasonic transducer unit is shown in Figure 1~
It was constructed as shown in Figure 3.

Divided electrode 1 divided into multiple pieces by slits on the top surface
The ultrasonic transducer 3 having a full-surface electrode 2 on the lower surface is
The electrodes 4 are formed on the entire outer surface, and the electrodes 5 are formed on the inner surface alternately in correspondence with the divided electrodes 1. The electrode 5 is electrically and mechanically coupled with solder or a conductive adhesive 7, and the entire surface electrode 2 and the outer surface electrode 4 are also electrically and mechanically connected by a conductive adhesive 7. A glass plate 9 is attached to the lower surface of the vibrator 3 with an adhesive 8 using solder or a conductive adhesive I, and a resin layer 1 is also attached to the lower surface of the glass plate 9.
It was configured by forming 0.

In such a configuration, since the ultrasonic transducer 3 and the insulating case 6 have different coefficients of thermal expansion, the electrodes 1 and 5 of both
Or solder or conductive adhesive 7 connecting 2 and 4
However, there was a drawback in that the particles would peel off from the respective electrode surfaces due to temperature changes.

Furthermore, since the ultrasonic transducer 3 and the glass plate 9 are bonded together, including the thickness of the solder or conductive adhesive 7, the signal wave is attenuated by the 8 layers of adhesive, resulting in a decrease in sensitivity. There was also.

The present invention eliminates the above-mentioned drawbacks of the prior art.

Embodiments of the present invention will be described below with reference to FIGS. 4 to 6.

11, when depositing an electrode on the top surface of a rectangular piezoelectric ceramic plate,
This ultrasonic vibrator 11 has a divided electrode 12 formed into eight electrodes by seven slits, and a full-surface electrode 13 is formed on the lower surface.
This is an insulating case 16 with an open top and bottom surface, in which an electrode 14 is formed on the entire outer surface, and divided electrodes 15 are formed on the inside surface, which are alternately formed in correspondence with the divided electrodes 12 of the ultrasonic transducer 110.
It is housed in the bottom of the box and held together with adhesive.

One end of a lead wire 17 is connected by solder 18 to the ends of the six divided electrodes 12 excluding both ends of the ultrasonic transducer 110, and the other end is connected to the divided electrode 15 of the insulating case 16 corresponding to this divided electrode 12. They are connected with solder 18.

Furthermore, one end of a lead wire 17 is connected to both ends of the entire surface electrode 13 on the lower surface of the ultrasonic transducer 11 with solder 18, and the other end is connected to the entire surface electrode 14 on the outer surface of the insulating case 16 with solder.

Further, a glass plate 19 is attached to the lower surface of the ultrasonic transducer 11 with an adhesive.

This glass plate 19 avoids the convex portions of the solder 18 present on both ends of the lower surface of the ultrasonic transducer 11, and is arranged so that the six divided electrodes 12
It is pasted so as to cover the entire surface of the electrode 13 facing the surface.

There is no glass plate 19 in the part of the entire surface electrode 130 that faces the two dummy parts at both ends of the divided electrode 12, and the resin layer 20 provided on the lower surface of the glass plate 19 is directly applied to the part where the glass plate 19 does not exist. is glued to.

The ultrasonic transducer unit of the present invention configured as described above uses both ends of the ultrasonic transducer as a dummy, so all the vibrating parts in the center can have the same level of sensitivity. Since the plate is attached to the entire smooth bottom surface of the ultrasonic transducer except for a part of the dummy, the adhesive layer becomes extremely thin, and the signal waves are not trapped in the adhesive and attenuated, improving sensitivity. Since the electrodes are connected using lead wires, it has the advantage of preventing unstable conduction between the electrodes even if the thermal expansion coefficients of the ultrasonic transducer and the insulating case differ. It is a dog of practical value.

[Brief explanation of the drawing]

Fig. 1 is a top view of a conventional ultrasonic transducer unit, Fig. 2 is a sectional view taken at A- in Fig. 1, and Fig. 3 is a cross-sectional view taken at B- in Fig. 1.
B' sectional view, FIG. 4 is a top view showing an embodiment of the ultrasonic transducer unit of the present invention, and FIG. 5 is A-A' in FIG. 4.
The sectional view, FIG. 6, is a sectional view taken along the line BB' in FIG. 4. 11...--Ultrasonic transducer, 12...Divided electrode, 13...Full-face electrode, 14...Full-face electrode, 15...Divided Electrode, 16...
Insulation case, 11...Lead wire, 18...
...Solder, 19...Glass plate, 20...
・Resin layer.

Claims (2)

[Scope of utility model registration request] (1) An ultrasonic transducer configured by providing a split electrode on the top surface of a rectangular piezoelectric ceramic plate and a full-scale electrode on the bottom surface is housed in an insulating case that has electrodes on the outside surface and a split electrode on the inside surface,
In an ultrasonic transducer unit in which each electrode of the ultrasonic transducer and an electrode of an insulating case are electrically connected, the divided electrodes of the ultrasonic transducer and the divided electrodes of the insulating case are connected via lead wires. Both ends of the entire surface electrode of the ultrasonic vibrator and the outer surface electrode of the insulating case are connected by an I7 wire, and a glass plate having a resin layer on the lower surface is pasted below the ultrasonic vibrator. Ultrasonic transducer unit. (2) Ultrasonic vibration according to claim (1) of the utility model registration, in which the split electrodes at both ends of the ultrasonic vibrator are used as a dummy, and a glass plate is attached to the entire lower surface of the ultrasonic vibrator except for a part of the dummy. child unit.