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JPS53136386

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DESCRIPTION JPS53136386
Description 1, title of the invention
Sphygmomanometer microphone
3. Detailed Description of the Invention The present invention relates to a sphygmomanometer
microphone for detecting Korotkoff sounds. 0 A conventional sphygmomanometer microphone is
shown in FIG. 1 and FIG. 1 is a plan view with the diaphragm removed, and FIG. 2 is a
longitudinal sectional view. In these figures, a circular diaphragm 2 is fixed to the opening of a
cylindrical microphone case 1 with a bottom, The piezoelectric element 4 is fixed to the inside of
the microphone case 1 by the holding body 3, and the elastic relay 5 is held between the
diaphragm 2 and the piezoelectric element 4 0 and the IJ-wire 6 of the piezoelectric element 4 is
The microphone cord 8 is connected via the printed circuit board 7. The mechanical impedance
value of the elastic relay 5 is selected to be an intermediate value between the mechanical
impedance of the human body and the mechanical impedance of the piezoelectric element 4. The
sphygmomanometer microphone having such a configuration efficiently transmits the vibration
of Korotkoff sound to the piezoelectric element 4, but since it has a frequency honor band wider
than that of the Korotkoff sound, there is a risk of picking up unnecessary noise. In order to
remove this, it was necessary to provide a noise removal filter circuit in the latter stage O.
Therefore, the object of the present invention is to provide a microphone for a blood pressure
monitor which does not require the noise removal filter circuit in the latter stage. is there. One
embodiment of the sphygmomanometer microphone of the present invention is shown in FIG. 3
and FIG. 3 is a plan view of the sphygmomanometer microphone with the diaphragm removed,
and FIG. 4 is a longitudinal sectional view. 0 In these figures, a circular diaphragm at the opening
of the bottomed cylindrical microphone case 1 2 is fixed, the piezoelectric element 4 is fixed by
the holding body 3 inside EndPage: 1 of the microphone case 1, the elastic relay 5 is held
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between the diaphragm 2 and the piezoelectric element 4, and the piezoelectric element 4 and
the microphone case A mechanical impedance body 9 such as a sponge is held between the
bottom of the housing 1 and the like. Further, the lead wire 6 of the piezoelectric element 4 is
connected to the microphone cord 8 through the printed circuit board 7. The mechanical
impedance body 9 has a resonance frequency fo as shown in FIG. 6 slightly higher than the
center frequency fm of the Korotkoff sound shown in FIG. In operation, Korotkoff sound of a
spectral distribution having a frequency band as shown in FIG. 5 and a frequency band between
the frequency fh and a center frequency fm is transmitted to the diaphragm 2. The vibration of
the diaphragm 2 is relayed to the elastic relay 5, transmitted to the piezoelectric element 4,
converted into an electric signal by the piezoelectric element 4, and output from the microphone
cord 8 through the lead wire 6 and the printed circuit board 7.
At this time, due to the filtering action of the mechanical impedance body 9 having the
mechanical impedance characteristic shown in FIG. 6, the microphone output voltage outputted
from the microphone cord 8 is as shown by a curve 10 in FIG. Comparing the results with the
microphone output voltage (curve 11) of the conventional sphygmomanometer microphone, it
can be seen that the attenuation of the microphone output voltage in the frequency domain other
than the frequency band of Korotkoff sound is large. That is, it is confirmed that the
sphygmomanometer microphone of this embodiment can remove unnecessary noise. Another
embodiment of the present invention is shown in FIGS. FIG. 8 is a plan view of a state in which
the diaphragm of another embodiment of the present invention is removed, and FIG. 9 is a
longitudinal sectional view of the other embodiment of the present invention. In these figures,
both ends of the piezoelectric element 4 are fixed by a pair of holders 3, 3. The other
configuration is the same as that of the above-described embodiment, so the same or
corresponding portions are denoted by the same reference numerals and the description thereof
will be omitted. As described above, in the microphone for a blood pressure monitor according to
the present invention, the diaphragm, the piezoelectric element, the elastic relay supported by
the diaphragm and the piezoelectric element, and the center frequency of the Korotkoff sound or
not) Since the mechanical impedance body having a slightly higher resonance frequency and
being in contact with the opposite side of the elastic relay contact portion of the piezoelectric
element is provided, it is not necessary to provide a noise removal filter in the subsequent stage.
4, a brief description of the drawing first I ¥! I is a plan view of the conventional
sphygmomanometer microphone with the diaphragm removed, FIG. 2 is a longitudinal crosssectional view of the same, and FIG. 3 is a diagram of the sphygmomanometer microphone
according to the present invention with the diaphragm removed. Fig. 4 is a plan view of the state,
Fig. 4 is a longitudinal sectional view of the same, Fig. 5 is a spectrum distribution of Korotkoff
sound, Fig. 6 is a frequency characteristic diagram of mechanical impedance body, and Fig. 7 is a
sphygmomanometer according to one embodiment of the present invention Of the microphone
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for comparison with the frequency characteristic of the microphone for the blood pressure
monitor of the prior art example, FIG. 8 is a plan view in a state where the diaphragm of the
other embodiment of the present invention is removed, and FIG. FIG. 2 ... diaphragm, 4 ...
piezoelectric element, 5 ... elastic relay, 9 ... mechanical impedance body EndPage: 2 Fig. 5 Fig. 9
EndPage: 3
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