JP2946097B2 - Ultrasonic probe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] Regarding an ultrasonic probe formed by attaching electrodes to a piezoelectric element, an electrode on the matching layer is bent back to a backing image without providing an extraction lead wire on the matching layer side. A groove is formed by forming an electrode and a groove is formed by bending the electrode on the matching layer side of the piezoelectric element to the backing material side to eliminate the adverse effect of vibration load and generate a symmetrical sound field. A groove having a predetermined depth is provided between the folded electrode and the electrode on the backing material side of the piezoelectric element so as to be separated from each other in terms of vibration.

[Industrial applications]

The present invention relates to an ultrasonic probe formed by attaching electrodes to a piezoelectric element.

[Problems to be solved by conventional technology and invention]

A conventional ultrasonic probe is shown in FIG.
One main surface is provided with an electrode 24, and the other main surface is provided with an electrode 21 having a folded portion. As shown in FIG. 5 (b), a matching layer is provided on the surface of the electrode 21, and a backing material is provided on the surface of the electrode 24. Then, lead wires are provided at the end of the electrode 24 and the folded portion of the electrode 21 as shown in the figure, and are respectively taken out to the outside. When a voltage is applied between the electrode 21 and the electrode 24 to drive the piezoelectric element 22 in this configuration, the vibration of the portion A is transmitted to the folded portion B and becomes a load, and the matching layer formed on the surface of the electrode 21 As shown in FIG. 5 (c), the radiation characteristics of the ultrasonic waves radiated from the antenna become asymmetric left and right, which is undesirable.

On the other hand, as shown in FIG.
No. 9536), and the surface on which the electrode lead attachment portion is formed,
There is a case in which grooves 5 and 7 having a predetermined cutting depth are formed from the other opposing surface to reduce the non-uniformity of the vibration mode of the piezoelectric vibrator due to a large vibration load caused by a heavy electrode lead mounting portion. This is because grooves are provided on the surface of the piezoelectric element opposite to the electrode lead attachment portion, and there is a problem that both lead wires cannot be taken out from one of the surfaces.

The present invention provides a groove by bending the electrode on the matching layer side to form a folded electrode on the backing side without providing a handle lead wire on the matching layer side, eliminating the adverse effect of vibration load, and creating a symmetrical sound field. It is intended to generate.

[Means to solve the problem]

 FIG. 1 shows a principle configuration diagram of the present invention.

In FIG. 1, an electrode 1 is an electrode on the matching layer side of the piezoelectric element.

The folded electrode 3 is an electrode formed by bending the electrode 1 on the matching layer side of the piezoelectric element 2 to the backing material side.

 The electrode 4 is an electrode on the backing material side.

 The groove 5 is for vibrationally separating.

[Action]

In the present invention, as shown in FIG. 1, the folded electrode 3 is formed by bending the electrode 1 on the matching layer side of the piezoelectric element 2 to the backing material side, and the folded electrode 3 and the piezoelectric element 2 on the backing material side are formed. A groove 5 having a predetermined depth is provided between the electrode 4 and the electrode 4 so as to be separated from each other by vibration, and lead wires are respectively taken out from the electrode 4 and the folded electrode 3.

Therefore, without providing a handle lead on the matching layer side,
The electrode on the matching layer side is bent to form a folded electrode 3 on the backing material side, and the folded electrode 3 and the electrode 4 on the backing material side are formed.
By providing the groove 5 between the left and right sides, it is possible to eliminate the adverse effect of the vibration load and generate a symmetrical sound field.

〔Example〕

Next, the configuration and operation of the embodiment of the present invention will be sequentially described in detail with reference to FIGS.

In FIG. 1A, an electrode 1 is an electrode on the matching layer side of the piezoelectric element 2 and emits a significant ultrasonic pulse.

The piezoelectric element 2 is an element for applying a voltage to the electrodes 1 and 4 to emit an ultrasonic pulse.

The folded electrode 3 is an electrode formed by bending the electrode 1 on the matching layer side of the piezoelectric element 2 to the backing material side, and is an electrode to which a lead wire is attached.

The electrode 4 is an electrode on the backing material side for applying a voltage to the piezoelectric element 2 and an electrode for attaching a lead wire.

The groove 5 is a cut groove for vibratingly separating the electrode 4 and the folded electrode 3 from each other, and is a groove separated from the portion A so that the folded portion in FIG. The groove 5 is provided with the folded electrode 3 and the electrode (backing material side) 4
The vibration of the portion A of the piezoelectric element 2 when a voltage is applied between the electrode 4 and the electrode 1 is not transmitted to the portion B and does not become a load.

FIG. 1B shows an actual configuration of the principle configuration of FIG.

In FIG. 1B, a lead wire 6 is a lead wire taken out from the electrode 4.

The lead wire 7 is a lead wire extracted from the folded electrode 3, and here is a lead wire of the electrode 1 on the matching layer side of each element obtained by dividing the piezoelectric element 2 into a plurality. Even if a voltage pulse is applied between these lead wires 6 and 7 to vibrate the piezoelectric element 2, the groove 5 has the groove 5, so that the folded electrode 3 does not become a load and the matching layer 5 As shown in Figure (c),
A symmetrical ultrasonic pulse will be emitted.

FIG. 1 (c) shows an example of a sound field characteristic radiated from the piezoelectric element 2 having the configuration of FIG. 1 (b) through the matching layer 5. This is an example of the sound field characteristic obtained by providing the groove 5 in FIGS. 1 (a) and 1 (b) to separate the portion B of the folded electrode 3 so as not to become a load as described above. Show.

FIG. 2 shows another embodiment of the present invention. This is because a groove 5-1 cut to a predetermined depth is further provided at a symmetrical position with respect to the groove 5 in FIG. 1 (b), and the center of the effective aperture is the center of the acoustic lens formed by the matching layer 5. It is a thing to match. As a result, compared to the configuration shown in FIG.
Furthermore, the sound field characteristics of the emitted ultrasonic waves can be made symmetrical. Here, C has the same length, and the center of the effective aperture is positioned at the center of the acoustic lens.

FIG. 3 shows a configuration diagram of another embodiment of the present invention. This is because the electrode 1 corresponding to the groove 5 is formed as shown in FIG.
Are raised with solder or metal foil is soldered. Thereby, even if the electrode on the radiation surface side is broken during manufacturing, it can be used as an electrode.

FIG. 4 shows a configuration diagram of another embodiment of the present invention. This is because, as shown in FIG. 4 (B), which is an enlarged view of the groove 5 where the cut is made in FIG. 4 (A), the cut corresponding to the groove 5 is cut until the piezoelectric element 2 is cut. The lever is filled with a non-conductive substance or the like, and then raised with solder, or a metal foil is soldered. Thereby, the influence of the folded portion can be completely eliminated.

〔The invention's effect〕

As described above, according to the present invention, the electrode 1 on the matching layer side is bent to form the folded electrode 3 on the backing material side without providing an extraction lead wire on the matching layer side, and the folded electrode 3 and the backing electrode 3 are formed. A groove 5 is provided between the material 4 and the electrode 4;
Since the configuration in which the lead wire is taken out from the folded electrode 3 and the electrode 4 is adopted, an adverse effect due to the vibration load can be eliminated, and a symmetrical sound field can be generated.

[Brief description of the drawings]

1 is a block diagram of one embodiment of the present invention, FIGS. 2, 3 and 4 are block diagrams of another embodiment of the present invention, and FIGS. 5 and 6 are explanatory diagrams of the prior art. . In the figure, 1 is an electrode (matching layer side), 2 is a piezoelectric element, 3 is a folded electrode, 4 is an electrode (backing material side), 5 and 5-1 are grooves,
Reference numerals 6 and 7 represent lead wires.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-64-36196 (JP, A) JP-A-57-123796 (JP, A) JP-A-58-136116 (JP, U) 9536 (JP, Y2) (58) Field surveyed (Int. Cl. ⁶ , DB name) H04R 17/00

Claims (1)

(57) [Claims] In an ultrasonic probe formed by attaching electrodes to a piezoelectric element, a folded electrode is formed by bending an electrode on a matching layer side of a piezoelectric element to a backing material side. A groove having a predetermined depth is provided between the electrode on the backing material side and vibrationally separated, and the radiation characteristics of ultrasonic waves radiated from the matching layer side are symmetrical. Sonic probe.