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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a conventional
sphygmomanometer microphone from which a diaphragm is removed, FIG. 2 is a longitudinal
sectional view thereof, and FIG. 73 is a diaphragm of one embodiment of the present invention. 4
is a longitudinal sectional view thereof, and FIG. 5 is a bottom view of the insulating diaphragm.
3 ...... piezoelectric elements, 5 ...... elastic relay terminal, 7 ...... lead, 9 ...... insulating diaphragm,
10 and 11 ... ··Copper foil.
DETAILED DESCRIPTION OF THE INVENTION This invention relates to a microphone used in a
blood pressure monitor or the like. Conventional examples of microphones for
sphygmomanometers, as shown in FIGS. It is shown in 21. In these figures, a circular diaphragm
2 is fixed to the opening of a bottomed cylindrical microphone case 1, a piezoelectric element 3
is fixed to the inside of the microphone case l by a holder 4, and the diaphragm 2 and the
piezoelectric are The elastic relay 5 for vibration transmission is held between the element 3 and
the lead 7 of the piezoelectric element 3 through the printed circuit board 6! It is connected to
the microphone code 8 and (1) 3-2). The printed circuit board 6 only plays a role as a relay part
for connecting the thin lead wire 7 and the thick microphone cord 8, which causes a cost
increase. Therefore, an object of the present invention is to provide a microphone that can
achieve cost reduction. One embodiment of this invention is shown in JIF 3 to 5. Diaphragm 9
used for this microphone is composed of a P edge plate, and steel foils 10.11 are independently
formed on the back surface, and lead wires 7 and microphone cord 8 of piezoelectric element 3
are formed on steel foils 10 and 11, respectively. The piezoelectric element 3 is soldered and
fixed to the inside of the microphone case 1 by the holder 4 as in the prior art, and the elastic
relay 5 is held between the piezoelectric element 3 and the diaphragm 9. As described above, the
microphone according to the present invention includes the insulating diaphragm, the pair of
conductive layers formed on the back surface of the P negative diaphragm, and the piezoelectric
element whose lead wire is connected to the pair of conductive layers. Since the piezoelectric
element is provided with a relay for relaying and transmitting the vibration of the insulating
diaphragm (2), the function of the printed circuit board can be given to the diaphragm, and the
number of parts can be reduced. It is possible to achieve cost reduction.