JPS61135636A - Ultrasonic probe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Technical Field 1 of the Invention] The present invention relates to an ultrasonic probe used in a medical ultrasonic diagnostic
- It is related to bu.

[Technical background of the invention and its problems] A conventional 7-aided array type ultrasonic probe has a structure as shown in FIG. In this method, a plurality of ultrasonic transducers 2 arranged in seven layers are provided on a backing material 1 in the shape of a rectangular parallelepiped, and an acoustic convex lens 3 is provided on the ultrasonic wave transmitting surface of the transducer 2.
A signal electrode plate 4 is provided on the back surface of the backing material 1, and signal pins 5 connected to each of the vibrators 2 are protruded from the electrode plate 4, respectively. The ground side of each vibrator is commonly connected to a ground electrode plate (hereinafter also referred to as a ground plate) extending on the side surface of the probe.

A signal line 7 is connected to each bin 5, each signal line 7 is insulated with a shield I8, and these lines are connected to each other.
The signal lines 7 are bound together and led to the transmitting/receiving circuit 1011 via one cable 9, and each signal line 7 is connected to the transmitting/receiving circuit. The bound portion of the shield JI8 is commonly connected to one earth line 1 by soldering or the like, and this earth line 11 is grounded together with the earth plate 6.

The equivalent circuit of this device is as shown in Figure 4.
A closed circuit is formed for each transducer A to 2N, and for example, a driving pulser 1OA is connected to the camera element 2A, and a receiving circuit 10B is connected to the other transducers 2N. Grounded.

However, with such a configuration, the signal flowing to the driven vibrator will flow through the signal line to the vibrator side, and will flow to the ground side through the common ground line, so Current will also flow through the ground line. Since the signal line is insulated and shielded by the shield wire, current flows through the shield wire covering the unused signal line. In this case, if a current flows in the opposite direction between the signal wire and its shield wire, the electromagnetic mutual induction effect can be canceled and a shielding effect can be achieved, but if the current flows only through the shield wire, no current will flow. Mutual electromagnetic induction occurs between the signal line and the signal line, causing the sensor connected to the signal line to malfunction. As a result, unnecessary signals are received, resulting in a problem that falsification can occur on the ultrasound image.

In addition, in this wiring configuration, each shield wire is grouped together and soldered to a single ground line, which results in a large area, requiring a large storage space, and There is a problem in that it hinders miniaturization.

[Object of the Invention] The present invention has been made in view of the above circumstances, and aims to prevent the generation of unnecessary signals, improve the quality of images, and
It is an object of the present invention to provide an ultrasonic probe that can reduce the proportion of the grounded portion to achieve miniaturization of the device.

[Summary of the Invention] In order to achieve the above object, the present invention provides an ultrasonic transducer comprising:
Signal lines are connected through signal electrode plates arranged in an array and provided on the signal supply side of the vibrator, a ground electrode plate is connected to the ground side of the vibrator, and each signal line has a shield wire. In an ultrasonic probe having an insulating coating, the ground electrode plate is divided into a plurality of pieces, each of the shield wires is divided into blocks for each vibrator included in the divided ground electrode plate, and each divided portion and each block are divided into blocks. It is characterized by being grounded to .

[Embodiments of the invention]・ The present invention will be specifically explained below using Examples.

FIG. 1 is a schematic perspective view showing an embodiment of the present invention, and FIG. 2 is an equivalent circuit diagram thereof. Components that are the same as those in FIG. 3 will be described with the same reference numerals.

The difference between the device in Fig. 1 and the device in Fig. 3 is that:
The ground electrode plate (earth plate) 16 is divided into multiple parts,
The divided ground plates 16A to 16M are mutually insulated, and the signal wire 7 bound and housed in the cable 9 and the shield wire 8 covering it are connected to each other on the transmission/reception circuit 10 side. Each of the plurality of vibrators corresponding to the ground plate is bound, and each bind shield wire portion 8A to 8D,...8M is connected to each divided ground plate 16A to 16D,...16M. is commonly connected to, and its connection line j! to-1+s...
・Zxl is grounded alone. Note that the number of divisions of the ground plates 16A to 16M may be arbitrary, but for example, when the total number of vibrators is 128, it is preferable to divide the earth plates into blocks of 62 vibrators for a total of 16 blocks. Naturally, the number of divisions of the bound shield wire 8 is also the same.

The equivalent circuit of such a device is shown in FIG. That is, for each vibrator 2A to 2N, there is a pulser 1OA and a reception circuit 1.
0B is connected, but the grounding method is that each block is individually connected to the divided ground plates 16A to 16M for each number of oscillators (for example, 62 adjacent elements), and each block is commonly grounded. will be done. Then, each divided block B1. . . . The shield wires 8 are also soldered every 8M, and each block is grounded.

Note that if the total number of oscillators changes, the number of divisions will also change accordingly.

[Effects of the Invention] According to the present invention described in detail above, a block is created for each of a plurality of adjacent oscillators, and each block is individually grounded, so that the block portion containing the oscillator that is mainly driven is Since the signal current and ground current flow in opposite directions, mutual induction is canceled out, and ground current does not flow to other parts of the block, unnecessary signals are not generated. It is possible to provide an ultrasonic probe that can prevent counterfeiting as much as possible. In addition, since each shield wire is grounded together for each divided block, it occupies a smaller area compared to the conventional case where all the wires are soldered together, contributing to the miniaturization of the device. I can do it.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of the present invention, FIG. 2 is an equivalent circuit diagram thereof, FIG. 3 is a schematic perspective view of a conventional ultrasonic probe, and FIG. 4 is an equivalent circuit diagram thereof. 2.2A~2N... Ultrasonic vibrator, 5...
...Signal bin, 7...Signal line, 8,8A
~8D... Shield wire, 9... Cable, 16.16A - 16M... Ground electrode plate. Figure 1

Claims (2)

[Claims] (1) Ultrasonic transducers are arranged in an array, a signal line is connected via a signal electrode plate provided on the signal supply side of the transducers, and a ground electrode plate is connected to the ground side of the transducers. ,
In an ultrasonic probe in which each signal line is insulated with a shield wire, the ground electrode plate is divided into a plurality of pieces, and each shield wire is divided into blocks for each vibrator included in the divided ground electrode plate. An ultrasonic probe characterized in that each divided portion and each block are grounded. (2) The ultrasonic probe according to claim 1, wherein the ground electrode plate is insulated for each divided portion.