JP2007060340A - Ultrasound transducer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem of unstableness of ultrasonic wave transmission and receive characteristics caused by variation of adhesive strength in an adhesive step where beads of contamination/blast remain on an adhesive face although chemical etching, sandblasting and the like are performed conventionally in surface treatment for the adhesive surface, when a metallic member is bonded with the piezoelectric body of the ultrasound transducer. <P>SOLUTION: The metallic member face, to which the piezoelectric material is bonded, is irradiated with laser, so the adhesive surface is roughened uniformly without leaving beads of contamination/blast and the like. Then, the adhesive strength is made stable, and transmission and reception characteristics of ultrasonic wave can be stabilized. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an ultrasonic transducer that transmits and receives an ultrasonic frequency band.

FIG. 7 is a schematic structural cross-sectional view of an aperture type ultrasonic transducer, and FIG. 8 is a schematic view of bonding of a piezoelectric body and a metal plate. FIG. 9 is a schematic structural cross-sectional view of a drip-proof ultrasonic transducer, and FIG. 10 is a schematic view of bonding of a piezoelectric body and a metal case. In pasting the piezoelectric body and the metal plate and the piezoelectric body and the metal case shown in FIGS. 8 and 10, the metal surface is conventionally roughened by chemical etching, sandblasting, or the like, and then the piezoelectric body is bonded. However, if the metal surface is roughened by chemical etching, contamination or the like remains on the metal surface, and if the metal surface is roughened by sandblasting, the beads used for blasting remain on the metal surface. There was a problem in that the strength of the agent varied and the stability of the transmission and reception characteristics of ultrasonic waves was poor.
Utility Model Registration Gazette No. 3039056

  Elimination of instability of ultrasonic transmission / reception characteristics due to variations in adhesive layer thickness and adhesive strength in bonding of piezoelectric materials and metal parts of aperture type ultrasonic transducers and drip-proof ultrasonic transducers Let

  When roughening the surface of the metal member to which the piezoelectric body is bonded, the surface is roughened by irradiating a laser so that the metal surface can be uniformly roughened without leaving any contamination or beads on the surface. Stabilize strength.

  The metal member surface to which the piezoelectric body is bonded is uniformly roughened by irradiating a laser, and the piezoelectric body is bonded.

  The metal member surface to which the piezoelectric body is bonded is uniformly roughened by irradiating a laser, and the piezoelectric body is bonded.

The present invention will be described with reference to FIG. 1, FIG. 2, FIG. 3, FIG.
FIG. 1 is a schematic view of bonding of a metal plate and a piezoelectric body according to an embodiment of the present invention, and FIG. 2 is an enlarged view thereof. As shown in FIG. 2, the surface of the metal member that bonds the piezoelectric body is uniformly roughened by irradiating the laser to uniformly bond the surface of the piezoelectric body and the metal member. Harder, and the adhesive layer is thin and stable. Furthermore, since the surface of the metal member to be bonded is uniformly roughened, conduction between the piezoelectric element electrode and the metal member becomes easy and stable during bonding.
FIG. 3 shows a schematic view of pasting of a conventional metal plate and a piezoelectric body. When the surface of the metal member is roughened by etching, contamination or the like may enter between the adhesive and the metal surface as shown in FIG. 4 and may not be bonded, or when the surface of the metal member is roughened by sandblasting etc. As shown in FIG. 5, blast beads that could not be removed were sandwiched, and adhesion could not be achieved.
Furthermore, as shown in FIG. 6, it can be applied to a portion where the metal member and the additional vibrator are bonded to each other, which is effective in stabilizing the characteristics.

  The present invention can be applied to various fields in which an ultrasonic sensor using a unimorph vibrator is used.

Schematic diagram of bonding metal plate and piezoelectric body according to an embodiment of the present invention Enlarged view of FIG. Schematic diagram of pasting of metal plate and piezoelectric body Enlarged view of Figure 3 for chemical etching Enlarged view of Fig. 3 for sandblasting etc. Bonding perspective view of additional vibrator and metal plate showing another embodiment of the present invention Schematic structural cross-sectional view of an aperture type ultrasonic transducer Bonding perspective view of metal plate and piezoelectric body of aperture type ultrasonic transducer Schematic structural cross section of a drip-proof ultrasonic transducer Bonding schematic diagram of metal case and piezoelectric body of drip-proof ultrasonic transducer

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal plate 2 Piezoelectric body 3 Unimorph vibrator 4 Terminal board 5 Electrode terminal 6 Electrode terminal 7 Additional vibrator 8 Case 9 Lead wire 10 Lead wire 11 Metal case 12 Filler 13 Sound absorbing material 14 Wire connector 15 Adhesive 16 Piezoelectric element 17 Element electrode 18 Surface roughening 19 Contamination etc. 20 Blast beads etc.

Claims (1)

  An ultrasonic transducer characterized in that, in a metal member for adhering a piezoelectric body, a treatment for uniformly roughening the surface is performed by irradiating a laser on the metal surface to which the piezoelectric body is adhered.

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