JPS6213200A - Ultrasonic wave vibrator - Google Patents

Abstract

PURPOSE:To improve the productivity by sticking and fixing each piezoelectric body and a printed board wher conductor pads are arranged corresponding to the body by means of an anisotropic adhesives so as to facilitate extraction of electrodes. CONSTITUTION:The anisotropic conductive adhesives 6 is applied to the entire face of the region surrounded by the outer conductor pads 5 of the printed board 4, the electrode 21 of each piezoelectric body 2 is positioned to the conductor pad 5 and sticked. The anisotropic conductive adhesives 6 is made by arranging conductive particles 62 such as carbon fibers into an electric insulation adhesives 61 in scattering way, the said adhesives 6 is inserted between the multi-layer printed board 4 and the electrode 21 of the piezoelectric body 2 and heated and pressed by a prescribed condition. The adhesives 6 is conductive between the conductor pad 5 and the electrode 21, but electric insulation is kept between the adjacentpads 5,5, then the adhesives 6 is applied to the entire face of the region surrounding by the pads 5 to stick immediately the piezoelectric body 2 to improve th productivity.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an ultrasonic transducer used in ultrasonic diagnostic equipment, ultrasonic flaw detection equipment, and the like.

<Summary of the Invention> The present invention provides an ultrasonic transducer in which a plurality of piezoelectric bodies are arranged in a matrix, and a printed board in which a conductor pano I' is formed corresponding to each piezoelectric body for the group of piezoelectric bodies. are adhered and fixed with an anisotropic conductive adhesive, which facilitates the extraction of the electrodes from the piezoelectric body group arranged in a 71-x shape.

<Background of the Invention> Conventionally, this type of ultrasonic transducer has been constructed by providing a common electrode on the ultrasonic wave transmitting/receiving surfaces of a plurality of piezoelectric bodies arranged in a matrix, and fixing a multilayer printed board on the opposite surface. The electrodes of each piezoelectric body are being taken out. However, in the conventional ultrasonic transducer, a conductive adhesive is applied to the upper surface of conductive pads 8 for taking out electrodes arranged in a row on a printed board 7, as shown in FIG. 4, and piezoelectric electrodes are bonded. ing.

In this structure, the smaller the piezoelectric body and the narrower the pitch 9 of the silicon array, the more precision is required in applying the conductive adhesive described above. There were problems such as the inability to use printed boards using plates, which resulted in poor productivity and versatility.

<Purpose of the Invention> The present invention solves the problems listed in ``-'' and facilitates the extraction of electrodes from a group of piezoelectric bodies arranged in a matrix.
The present invention aims to provide a new ultrasonic transducer that can significantly improve productivity.

<Structure and Effects of the Invention> In order to achieve the object described in 1-, the present invention provides an ultrasonic transducer in which a plurality of piezoelectric bodies are arranged in a matrix and a common electrode is provided on the ultrasonic wave transmission/reception wave surface. and a pudding board on which conductor pads are arranged correspondingly, are adhered and fixed with an anisotropic conductive adhesive. According to the above configuration, in the present invention, an anisotropic conductive adhesive is applied to the entire surface of the area connecting the outermost conductive pads of the printed board,
By aligning and pasting the electrodes of each piezoelectric body to the conductor pad, the electrodes of the piezoelectric body group can be easily taken out, and productivity is further improved compared to the conventional structure in which adhesive is applied to the top surface of each conductor pad. improves. Moreover, the total of the piezoelectric group is 1-
If the process is the same, the arrays can be manufactured on the same line even if their pitches are different, which has practical effects such as improving production efficiency.

<Explanation of Examples> FIG. 1 shows an ultrasonic transducer according to the present invention.

In the illustrated example, conductive pads are arranged in a plurality of rows and rows of conductive bodies 2 corresponding to the piezoelectric bodies 1 and 2, each having a piezoelectric body group 1 and a piezoelectric body 2, each having a 1111 electrode 3 on the ultrasonic wave transmitting/receiving surface. A multilayer printed circuit board 4 on which conductor pads 5 are arranged is provided, and an anisotropic conductive adhesive 6 is applied to the entire area of the printed circuit board 4 surrounded by the outer peripheral conductor pads 5, and the electrodes 21 of each piezoelectric body 2 are It is positioned and fixed to the conductor pad 5 by adhesion.

The anisotropic conductive adhesive 6 is made by blending conductive particles 62 such as carbon fibers into an electrically insulating adhesive 61 in a dispersed state. Electrode 2
By applying heat and pressure under predetermined conditions, adhesive 6 is formed between conductor pad 5 and electrode 21.
1 is excluded, the dispersion ratio of the conductive particles 62 increases, and the pad 5. Conductive I between electrodes 21
At the same time, between the adjacent pads 5, 5, the dispersion ratio of the conductive particles 62 decreases due to the adhesive 61 that has flowed out, and the particles 62 are wrapped in the adhesive 61, so that insulation is maintained and at the same time , the printed board 4 and the electrode 21 are fixed with adhesive.

As described above, the present invention provides an ultrasonic transducer in which a plurality of piezoelectric bodies 2 are arranged in a matrix, and a printed board on which a conductive pad 5 is formed corresponding to each piezoelectric body 2 for this piezoelectric body group 1. 4 is adhered and fixed with an anisotropic conductive adhesive 6, the adhesive 6 provides electrical conduction between the conductor pad 5 and the piezoelectric electrode 21, but there is no electricity between the adjacent pads 5, 5. Since the insulation is maintained, the adhesive 6 can be applied to the entire area surrounded by the outer conductor pad 5 and the piezoelectric body 2 can be attached immediately, improving productivity. Furthermore, if the piezoelectric body group 1 has the same overall dimensions, it can be manufactured on the same line even if the array pitch is different, which has the effect of achieving the purpose of the invention, such as improving production efficiency.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the ultrasonic transducer according to the present invention, FIG. 2 is a diagram showing the positions of the conductor pads on the pudding 1 to the plate, and FIG. 3 is an enlarged sectional view taken along the line 111-Iff in FIG. 1. FIG. 4 is a diagram for explaining the prior art. 1...Piezoelectric body group 2...Piezoelectric body 21...
... Electrode 3 ... Common electrode 4 ... Printed board 5 ... Conductor pad 6 ... Anisotropic conductive adhesive 61 ... Adhesive 62 ... Particles Applicant Tateishi Electric Co., Ltd.
Hori = Shiguyaa answer, Q Naki ＼ ＼

Claims (1)

[Scope of Claims] 1. An ultrasonic transducer in which a plurality of piezoelectric bodies are arranged in a matrix, wherein a common electrode is provided on the ultrasonic wave transmitting/receiving surface of the piezoelectric body group, and each An ultrasonic transducer made by adhering and fixing a printed board on which conductive pads are arranged to correspond to the piezoelectric material using an anisotropic conductive adhesive. 2. The anisotropic conductive adhesive is an ultrasonic vibration according to claim 1, in which conductive particles that conduct between the opposing electrodes and the conductor pad are dispersed in an electrically insulating adhesive resin. Child.