JP2006254360A - Apparatus for transmitting/receiving ultrasonic wave - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for transmitting/receiving ultrasonic waves which can be connected to a piezoelectric element and an external circuit using a simple configuration, regarding the ultrasonic wave transmitting/receiving apparatus for transmitting and/or receiving ultrasonic waves. <P>SOLUTION: The present invention relates to an ultrasonic wave transmitting/receiving apparatus, for transmitting or receiving ultrasonic waves, including a piezoelectric element (112) and a case (111) for housing the piezoelectric element (112), wherein the piezoelectric element (112) can be connected to the outside of the case (111) relaying a flexible printed wiring board (113). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an ultrasonic transmission / reception apparatus, and more particularly to an ultrasonic transmission / reception apparatus that transmits and / or receives ultrasonic waves.

  A conventional ultrasonic sensor generates an ultrasonic wave and receives the generated ultrasonic wave. The ultrasonic sensor is used in, for example, a distance measuring system that measures a distance to an object. In the distance measuring system, the signal from the ultrasonic sensor is detected, the time from transmission of the ultrasonic wave to reception thereof is measured, and the distance from the measured time to the object is measured.

  FIG. 5 shows a configuration diagram of an example of a conventional ultrasonic sensor.

The ultrasonic sensor 1 mainly connects a case 11, a piezoelectric element 12 disposed in the case 11, a terminal plate 13 that pulls the piezoelectric element 12 out of the case 11, a terminal plate 13, and the piezoelectric element 12. It comprised from the wire 14 and the shock absorbing material 15 with which the case 11 was filled (refer patent document 1, 2).
JP-A-11-266498 Japanese Patent Laid-Open No. 10-257595

  However, in the conventional ultrasonic sensor, since the piezoelectric element 12 and the terminal plate 13 are connected by the wire 14, the number of parts is large and a process such as soldering is required, so that the production efficiency is low. In addition, since aluminum is used for the case 11 and the like because it is vibrated by mechanical resonance, it is difficult to perform soldering and the productivity is further deteriorated.

  The present invention has been made in view of the above points, and an object thereof is to provide an ultrasonic transmission / reception apparatus that can be connected to a piezoelectric element and an external circuit with a simple configuration.

  The present invention relates to an ultrasonic transmission / reception apparatus that transmits or receives ultrasonic waves, and includes a piezoelectric element (112) and a case (111) that houses the piezoelectric element (112), and relays a flexible printed wiring board (113). The piezoelectric element (112) can be connected to the outside of the case (111).

  One end of the flexible printed wiring board (113) is connected to the piezoelectric element (112), and the other end is connected to a connection line (115) extending from the case (111).

  It has a holding substrate (114) that holds a part of the flexible printed wiring board (113) and is held by the case (111).

  It has a connection pin (116) for connecting the flexible printed wiring board (113) and the case (111).

  Further, according to the present invention, in an ultrasonic transmission / reception apparatus that transmits or receives ultrasonic waves, the piezoelectric element (112), the case (111) that houses the piezoelectric element (112), and the piezoelectric element (112) that is the case (111). It has a connection board (113) for connecting to the outside, and connection pins (116) for connecting the connection board (113) and the case (111).

  The connection board (113) is composed of a flexible printed wiring board.

  The connection pin (116) is press-fitted into the case (111) and soldered to the connection board (113).

  In addition, the said reference code is a reference to the last, This does not limit a claim.

  According to the present invention, since it is possible to connect the piezoelectric element to the outside of the case by relaying the flexible printed wiring board, it is not necessary to solder a wire or the like. Can connect.

[First embodiment]
FIG. 1 is an exploded perspective view of a first embodiment of the present invention, and FIG. 2 is a cross-sectional view of the first embodiment of the present invention.

  The ultrasonic transmission / reception apparatus 100 according to the present embodiment is a transmission / reception type ultrasonic sensor that generates and outputs an ultrasonic wave to the outside and receives a reflected wave from the outside, and includes a case 111, a piezoelectric element 112, and a flexible printed wiring. The plate 113, the relay substrate 114, the shield wire 115, the connection pins 116, and the filler 117 are included.

  The case 111 is formed of an aluminum material in a bottomed cylindrical shape, and the piezoelectric element 112 is bonded to the inner peripheral bottom surface 121. Further, a step portion 122 is formed on the inner peripheral side portion. The step portion 122 is for positioning the relay substrate 114. The step portion 122 is formed by setting the diameter on the bottom side of the inner peripheral side surface in the arrow Z2 direction side to r1, and the diameter on the opening surface side and the arrow Z1 direction side in r2 (> r1). A hole portion 123 is formed in the arrow Z1 direction portion of the stepped portion 122 in the arrow Z2 direction. The hole 123 is for implanting the connection pin 116.

  The piezoelectric element 112 has a configuration in which electrodes 132 and 133 are formed on a ceramic substrate 131 that is formed in a circular shape having a substantially smaller diameter than r1. The electrode 132 is formed on the surface of the ceramic substrate 131 on the arrow Z1 direction side, and the electrode 133 is formed on the surface of the ceramic substrate 131 on the arrow Z2 direction side. The piezoelectric element 112 is housed in the case 111 so that the surface on the arrow Z2 direction side faces the bottom surface 121 of the case 111. At this time, the surface on the arrow Z2 direction side of the piezoelectric element 112 is fixed to the bottom surface of the case 111 with a conductive paste. Note that the electrode 133 is electrically connected to the case 111 by a conductive paste.

  A flexible printed wiring board 113 is soldered to the electrode 132 of the piezoelectric element 112. The flexible printed wiring board 113 is mainly composed of a drawing portion 141 and a connecting portion 142. The lead-out portion 141 is provided with a printed wiring 151. One end of the printed wiring 151 is exposed at the leading end of the lead portion 141, and the exposed portion of the printed wiring 151 is soldered to the electrode 132.

  The connection part 142 is bonded to the relay substrate 114. The connecting portion 142 has a circular shape with a diameter slightly smaller than r2, has a notch 161 on the arrow Y1 direction side, a notch 162 on the arrow Y2 direction side, and a recess 163 on the arrow X2 direction side. Is formed. The lead-out portion 141 extends from the substantially central portion of the notch portion 161 in the arrow Y1 direction. Further, through holes 164 and 165, lands 166 to 168, and a wiring 169 are formed in the connection portion 142. A land 166 is formed around the through hole 164. The land 166 is connected to the other end of the printed wiring 151 formed on the lead portion 141.

  The signal line 171 of the shield line 115 passes through the through hole 164 from the arrow Z2 direction side which is the bottom surface side of the case 111 toward the arrow Z1 direction which is the opening surface direction of the case 111. A land 166 is formed around the through hole 164 on the arrow Z1 direction side. The land 166 is connected to the other end of the printed wiring 151 formed in the lead portion 141, and the signal line 171 is soldered. As a result, the signal line 171 is connected to the electrode 132 of the piezoelectric element 112 via the printed wiring 151.

  Further, the connection pin 116 passes through the through hole 165. A land 167 is formed around the through hole 165 on the arrow Z1 direction side. One end of the wiring 169 is connected to the land 167, and the connection pin 116 is soldered. The connection pin 116 is press-fitted into a hole 123 formed in the step portion 122 of the case 111.

  The other end of the wiring 169 is connected to the land 168. The ground line 172 of the shield line 115 is soldered to the land 168. The ground line 172 of the shield line 115 is connected to the case 111 via the wiring 169 and the connection pin 116, and further connected to the electrode 133 of the piezoelectric element 112 via the case 111.

  Thus, the signal line 171 of the shield line 115 is connected to the electrode 132 of the piezoelectric element 112, and the ground line 172 is connected to the electrode 133 of the piezoelectric element 112.

  The relay substrate 114 is made of an epoxy resin or the like, has the same planar shape as the connection portion 142, and has through holes 181 and 182 at the same positions as the through holes 164 and 165 of the flexible printed wiring board 113. The relay substrate 114 is bonded to the flexible printed wiring board 113 and functions as a backing substrate for the flexible printed wiring board 113.

  The case 111 is filled with the filler 117 after the piezoelectric element 112, the flexible printed wiring board 113, and the relay board 114 are stored. The filler 117 is made of, for example, a thermosetting resin or an ultraviolet curable resin. The filler 117 flows between the piezoelectric element 112 and the relay substrate 114 through the flexible printed wiring board 113 and the cutout portions 161 and 162 of the relay substrate 114 at the time of filling. The filler 117 is cured by irradiating ultraviolet rays from the opening surface of the case 111 after filling.

〔effect〕
According to this embodiment, the piezoelectric printed circuit board 112 and the shield wire 115 can be connected by the flexible printed wiring board 113. For this reason, the connection between the piezoelectric element 112 and the shield wire 115 can be easily and efficiently performed.

[Others]
In this embodiment, the shield wire 115 is used for connection to an external circuit, but a lead wire or the like may be used. Moreover, you may make it extend a flexible printed wiring board and extend outside.

[Second Embodiment]
FIG. 3 is an exploded perspective view of the second embodiment of the present invention, and FIG. 4 is a sectional view of the second embodiment of the present invention. In the figure, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and the description thereof is omitted.

  The ultrasonic transmission / reception apparatus 200 according to the present embodiment is configured to extend a connection line from the case 111 to the outside by a flexible printed wiring board 213 instead of the shield line 115. Accordingly, the configurations of the flexible printed wiring board 213 and the relay substrate 214 are different from those of the first embodiment.

  The flexible printed wiring board 213 of the present embodiment is different from the flexible wiring board 113 in the configuration of the connection portion 242 and the extension portion 243. The flexible printed wiring board 213 is integrally formed with a lead portion 141, a connection portion 242, and an extension portion 243.

  The flexible printed wiring board 213 has an extending portion 243 extending from an end portion of the connecting portion 242 in the arrow Y2 direction. Wirings 251 and 252 are formed in the extending portion 243. The wiring 251 is connected to one end of the wiring 261 at the connection portion 242. The other end of the wiring 261 is connected to the other end of the wiring 151 formed in the lead portion 141. As a result, the wiring 251 is connected to the electrode 132 of the piezoelectric element 112 via the wirings 261 and 151.

  In addition, the wiring 252 is connected to one end of the wiring 262 through the connection portion 242. The other end of the wiring 262 is connected to the land 167. As a result, the wiring 252 is connected to the electrode 133 of the piezoelectric element 112 through the wiring 262, the connection pin 116, and the case 111.

  Further, the relay substrate 214 is configured without the through hole 181 and the recess 183 because the shield wire 115 is not necessary.

  According to this embodiment, the connection between the piezoelectric element 112 and an external circuit can be performed by the single flexible printed wiring board 213. Therefore, the process of soldering the shield wire 115 and the flexible printed wiring board becomes unnecessary, and the manufacturing process can be simplified.

It is a disassembled perspective view of 1st Example of this invention. It is sectional drawing of 1st Example of this invention. It is a disassembled perspective view of 2nd Example of this invention. It is sectional drawing of 2nd Example of this invention. It is a block diagram of an example of the conventional ultrasonic sensor.

Explanation of symbols

100, 200 Ultrasonic transceiver 111 Case, 112 Piezoelectric element, 113, 213 Flexible printed wiring board 114, 214 Relay board, 115 Shield wire, 116 Connection pin, 117 Filler

Claims (7)

In an ultrasonic transmission / reception apparatus that transmits or receives ultrasonic waves,
A piezoelectric element;
A case for housing the piezoelectric element;
An ultrasonic transmission / reception apparatus characterized in that the piezoelectric element can be connected to the outside of the case by relaying a flexible printed wiring board. One end of the flexible printed wiring board is connected to the piezoelectric element,
The ultrasonic transmission / reception apparatus according to claim 1, wherein the other end is connected to a connection line extending from the case.   The ultrasonic transmission / reception apparatus according to claim 1, further comprising a holding substrate that holds a part of the flexible printed wiring board and is held by the case.   The ultrasonic transmission / reception apparatus according to claim 1, further comprising a connection pin that connects the flexible printed wiring board and the case. In an ultrasonic transmission / reception apparatus that transmits or receives ultrasonic waves,
A piezoelectric element;
A case for housing the piezoelectric element;
A connection substrate for connecting the piezoelectric element to the outside of the case;
An ultrasonic transmission / reception device comprising a connection pin for connecting the connection substrate and the case.   The ultrasonic transmission / reception apparatus according to claim 5, wherein the connection board is composed of a flexible printed wiring board.   The ultrasonic transmission / reception apparatus according to claim 5 or 6, wherein the connection pin is press-fitted into the case and soldered to the connection board.

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