JPS61193627A - Vibration detection sensor - 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) The present invention relates to a vibration detection sensor, and more particularly to a vibration detection sensor suitable for use in detecting Korotkoff sounds in an electronic blood pressure monitor.

(Background Art) Conventionally, as shown in FIG. 1, this type of vibration detection sensor includes a piezoelectric element 3 approximately at the center of the inner surface of a disc-shaped diaphragm la'.
′ is glued and a ring-shaped vertical wall 1 is attached around the diaphragm la′.
A hole is provided in a part of the vertical wall 1d' and a lead wire 4' is inserted into the piezoelectric element 3' and the vertical wall 1d'.
A lead wire 4' was soldered to the diaphragm to output an electric signal, and a cup-shaped lid 1.' was installed from above the diaphragm to form a tensor.

In this way, the conventional sensor has a large number of parts, and requires drawing process to form the diaphragm 11' and the lid 1. The drawback was that it required a lot of time and effort to process and assemble. (Purpose for horses) This s4 was proposed in consideration of the above points, and its purpose is to reduce the number of parts, facilitate the processing of parts, and further reduce costs suitable for mass production. It is to provide vibration detection sensor to obtain.

(Disclosure of disuse) Hereinafter, Honyamei will be explained along with the drawings.

Figures 2 to 4 show an embodiment of the present invention,
In these figures, 1 is a flat case, and this case 1 is made by cutting a cylindrical metal gib to a predetermined length and then compressing it by crushing it while leaving a space in the radial direction. It consists of

In this case 1, it is preferable to form a curve. This is so that it fits around the arm when used as a sensor for detecting pulse sounds and measuring blood pressure.

Further, 1 m of the lower surface of the case 1 is used as a diaphragm, and a piezoelectric element 3 is bonded to the inner side of the diaphragm with an adhesive 2 interposed therebetween. This piezoelectric element 3 is inserted into the case l through a side opening and is bonded.A conductive material is deposited on the upper and lower surfaces of the piezoelectric element 3, and the core wire 4a of the lead wire 4 is attached to the upper surface. They are connected via solder 5a. Further, the shield wire 4b of the lead wire 4 is connected and fixed to the inner surface of the upper plate 1b constituting the upper surface of the case l by solder 5b.

Next, the operation when the present invention is used as a sensor for a blood pressure monitor will be explained.

First, when the case 1 is attached to a cuff band (not shown) and wrapped around the arm, the diaphragm 1a vibrates due to the Korotkoff sound, which causes distortion in the piezoelectric element 3 and creates a potential on the upper and lower surfaces of the piezoelectric element 3. occurs. A core wire 4a is directly soldered and electrically connected to the top surface of the piezoelectric element 3, and the bottom surface 1a is used to connect and separate the diaphragm and the minute protrusions on the surface of the piezoelectric element 30, as shown in FIG. Therefore, the bottom surface of piezoelectric element 3 ~
Electrical connection is made through a path from the lower surface 1a of the case, that is, from the diaphragm to the upper plate lb to the shield wire 4b.

As a result, the potential generated in the piezoelectric element 3 is taken out by the IJ-wire 4 and processed by an appropriate circuit (not shown), so that vibrations due to Korotkoff sounds can be detected.

5 and 6 show another embodiment of the present invention, in which a lid is placed in the space between the diaphragm and the upper plate 1b.
In addition to increasing the strength of the case 10 by providing the cover 1c, the lid 1c is made of a conductive material to reduce the shielding effect. Note that the other configurations and operating conditions are the same as in the previous embodiment.

(Effects of the Invention) According to the present invention, there is provided a flat case made by cutting a tube material into a predetermined length and crushing it in the radial direction leaving a space, and this case. Since the sensor includes a piezoelectric element bonded to the inner surface of the sensor, it is easy to process and assemble the parts, and it is suitable for mass production, so there is an advantage that an inexpensive vibration detection sensor can be obtained.

In addition, since it is flattened by being crushed, it is possible to make the vibration detection sensor into a conductive structure.

[Brief explanation of drawings]

Fig. 1 is a conventional example, Figs. 2 to 4 are an embodiment of the present invention, Fig. 2 is an overall perspective view of the present invention, Fig. 3 is a side sectional view of the same, and Fig. 4 is a main part. An enlarged explanatory view, FIG. 5 is an overall perspective view of another embodiment of the present invention, and FIG. 6 is a side sectional view of the same embodiment. 1...Case, 1a...Bottom surface, 1b...Top plate, 2
...Adhesive, 3...Pressure element 1, 4...Lead wire. (Other locations) Figure 1 Figure 2

Claims (1)

[Claims] A vibration detection sensor comprising a flat case made by cutting pipe material to a predetermined length and crushing it in the radial direction leaving a space, and a piezoelectric element bonded to the inner surface of the case.