JP3039111U - Ultrasonic transceiver - Google Patents

Abstract

(57) Abstract: In a piezoelectric body that constitutes a bimorph oscillator of an ultrasonic transceiver, its shape has conventionally been circular or square. When the piezoelectric body had a circular shape, there were large variations in dimensions and characteristics, and manufacturing costs such as labor costs were high. Further, in the case of a quadrangle, the vibration efficiency of the vibrating body was poor, and the efficiency of the transmission sound pressure and the reception sensitivity of the ultrasonic transceiver decreased. A piezoelectric body forming a bimorph oscillator of an ultrasonic transmitter / receiver has a polygonal shape of hexagon or more.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an ultrasonic transmitter / receiver using a bimorph vibrator, and relates to the shape of a piezoelectric body.

[0002]

[Prior art]

 As shown in FIG. 3, the general structure of an ultrasonic transceiver using a bimorph oscillator is a circle in which a bimorph oscillator 3 in which a piezoelectric body 2 is attached to a metal plate 1 is formed on the upper surface of a terminal plate 4. Attached to the upper end of the circumferential convex portion, electrically connecting the electrode terminals 5 and 6 of the terminal plate 4 to the electrodes of the metal plate 1 and the piezoelectric body 2, respectively, and adding the additional vibrator on the metal plate 1 of the bimorph vibrator 3. 7 is attached, and these are covered by a case 8 attached to the terminal board 4. By the way, conventionally, the piezoelectric body 2 is formed in a circular shape or a quadrangular shape as shown in FIGS. Originally, this type of ultrasonic transmitter / receiver was required to have isotropic directivity, and the case was cylindrical and the metal plate was circular. A combination of a circular piezoelectric body and a circular metal plate has been put into practical use for the first time because of its excellent vibration efficiency. However, since it is difficult to shave a circular piezoelectric body from a wafer, the production process of "circular pressing-baking" is performed for each product, resulting in high labor costs such as labor costs. In addition, it is very difficult to control the shrinkage rate during firing, and large dimensional variations and characteristic variations occur after firing. As a result, the ultrasonic transceiver using a circular piezoelectric body has large variations in characteristics and is expensive to manufacture. On the other hand, the square piezoelectric body can be easily cut out from the wafer, which can reduce the cost, improve the dimensional accuracy, and stabilize the characteristics. However, the combination of a rectangular metal plate with a circular metal plate has a problem that the vibration efficiency of the vibrating body is poor, and the efficiency of the transmission sound pressure and the reception sensitivity are reduced.

[0003]

[Problems to be solved by the device]

 When a circular piezoelectric body is used, there are problems in that the characteristic variation is large and the manufacturing cost is high. In addition, when a rectangular piezoelectric material is used, there is a problem that the efficiency of the transmitted sound pressure and the received sensitivity is reduced.

[0004]

[Means for solving the problem]

 In contrast to a circular metal plate, a polygonal piezoelectric body with a hexagonal shape or more provides good vibration efficiency equivalent to that of a circular piezoelectric body. In addition, a hexagonal or higher polygonal piezoelectric body can be easily cut out from a wafer, which reduces manufacturing cost and stabilizes dimensional accuracy and characteristics.

[0005]

[Embodiment of the invention]

 A bimetal oscillator is constructed by bonding a circular metal plate and a hexagonal or larger polygonal piezoelectric body with an adhesive.

[0006]

Example 1 A hexagonal piezoelectric body was used in consideration of characteristics and cost among polygonal piezoelectric bodies of hexagonal shape or more. An example of a hexagonal piezoelectric body will be described with reference to FIG. A circular metal plate having an outer dimension of φA and a hexagonal piezoelectric body having a diagonal B of B ≦ A are bonded with an adhesive to form a bimorph oscillator. In FIG. 3, a bimorph vibrator is mounted on the terminal plate, and electrode terminals 5 and 6 penetrating the terminal plate are soldered to the metal plate and the electrodes of the piezoelectric body respectively, and additional vibration is applied to the metal plate of the bimorph vibrator. Attach the child and cover them with the case attached to the terminal board.

[0007]

Second Embodiment In FIG. 2, another embodiment of the hexagonal piezoelectric body will be described. A partially cut circular metal plate having an outer dimension of φA and a hexagonal piezoelectric body having a diagonal B of B ≧ A are bonded with an adhesive to form a bimorph oscillator. In Fig. 4, the bimorph vibrator is mounted on the terminal plate, and the electrode terminals 5 and 6 penetrating the terminal plate are directly soldered to both electrode surfaces of the piezoelectric body, and the additional vibration is applied to the metal plate of the bimorph vibrator. Attach the child and cover them with the case attached to the terminal board.

[0008]

[Effect of the invention]

 By using a hexagonal or higher polygonal piezoelectric body, it is possible to obtain an ultrasonic transceiver with low transmission cost, good transmission sound pressure, and high reception sensitivity efficiency while keeping manufacturing costs low.

[Brief description of the drawings]

Fig. 1: Schematic diagram of a bimorph oscillator showing an embodiment of the present invention Fig. 2: Schematic diagram of a bimorph oscillator showing another embodiment of the present invention Fig. 3: Schematic cross-sectional view of an ultrasonic transceiver Fig. 4: Ultra Other schematic structural sectional view of sound wave transmitter / receiver Fig. 5: Schematic diagram of conventional bimorph oscillator Fig. 6: Schematic diagram of other conventional bimorph oscillator

[Explanation of symbols]

 1: Metal plate 2: Piezoelectric body 3: Bimorph oscillator 4: Terminal plate 5: Electrode terminal 6: Electrode terminal 7: Additional oscillator 8: Case 9: Lead wire 10: Lead wire

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Takumi Matsushima 4 372 Kumoyama, Tottori City, Tottori Prefecture Japan Ceramics Co., Ltd.

Claims (1)

[Utility model registration claims] 1. An ultrasonic transceiver in which an additional oscillator is attached to a bimorph oscillator in which a metal plate and a piezoelectric body are bonded together, and these are housed in a case, the piezoelectric body having a hexagonal shape or more. An ultrasonic transmitter / receiver characterized by having a polygonal shape.