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JPS5561196

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DESCRIPTION JPS5561196
Title: Invention (1) An electro-acoustic transducer comprising: a predetermined case, at least one
piezoelectric element provided in the case, and an impedance conversion circuit connected to the
piezoelectric element, The element which comprises the said impedance conversion circuit was
embedded by the synthetic resin, and was provided in the said case, The electro-acoustic
transducer characterized by the above-mentioned.
2, the scope of claims
3. Detailed Description of the Invention The present invention relates to an electro-acoustic
transducer, and more particularly to an electro-acoustic transducer using a piezoelectric element.
The electro-acoustic transducers include earphones, headphones and the like, while the acousticelectrical transducers include microphones and the like. Further, for example, in the microphone,
there is a piezoelectric microphone using a piezoelectric element, and further, as a piezoelectric
microphone, there is a vibration pickup type ear microphone that detects bone vibration of an
ear canal wall and converts it directly into an electrical signal. This vibration pickup type ear
microphone has, for example, a case having a protrusion which can be inserted into the ear canal
and an element storage portion, at least one piezoelectric element whose one end is fixed in the
protrusion of the case, and impedance An impedance conversion circuit connected to the output
end of the piezoelectric element in the element storage portion of the case to perform
conversion. In the case of a piezoelectric microphone, it is generally necessary to provide an
impedance conversion circuit as described above for high impedance output to perform
impedance conversion, and a FET (field effect transistor) or a microphone transformer is used for
this impedance conversion. The conventional vibration pick-up type ear microphone has a
drawback that it is weak against vibration, impact, etc. because the output cord and EndPage: 1
FET with impedance conversion are directly connected to the piezoelectric element by soldering
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etc. . The object of the present invention is to provide an electro-acoustic transducer which
overcomes the above-mentioned drawbacks. Hereinafter, the present invention will be described
in detail with reference to the attached drawings. FIG. 1 is a cross-sectional view of an
embodiment of an electro-acoustic transducer according to the present invention, such as a
vibration pickup type ear microphone. In the figure, a case 1 is a shield case for accommodating
an impedance conversion circuit described later, considering an ear umpah and a road, a
projecting portion 2 which can be inserted into the inside and an element accommodating
portion 3. For example, one piezoelectric element 4 that converts vibration into an electrical
signal is provided in the protruding portion 2 of the case 1. Reference numeral 5 denotes one of
a group of elements constituting an impedance conversion circuit or the like connected to the
output end of the piezoelectric element 4 to perform impedance conversion, for example, FKT
(field effect transistor) It is connected by soldering or the like between one of the signal lines.
The other signal line of the cord 6 is connected to the other output end of the piezoelectric
element 4, and the earth line is attached to the shield case 1.
The elements and cords 6 constituting the impedance conversion circuit etc. are embedded in the
element storage portion 3 of the case 1 by being embedded in a lightweight synthetic resin 7
such as epoxy resin which is light in weight and has good electrical and thermal insulation. There
is. Further, the synthetic resin 7 supports one end of the piezoelectric element 4 in order to also
serve as a support member for the piezoelectric element 4 provided in the projecting portion 2.
When fixing each element and the like by the synthetic resin 7, each element and the like
connected by soldering is distributed in the case 1 and then the synthetic resin 7 is filled in the
case 1 or each element connected Etc. The synthetic resin 7 molded with is inserted into the case
1. FIG. 2 is a cross-sectional view of another embodiment according to the present invention, and
the same parts as FIG. 1 are indicated by the same reference numerals. In the present
embodiment, the elements constituting the impedance conversion circuit are attached to the
small and thin printed board 8 and embedded in the synthetic resin 7 together with the printed
board 8 to be provided in the case 1. By using a substrate of double-sided pattern as the printed
circuit board 8, the degree of integration of the element groups constituting the impedance
conversion circuit and the like is improved, so that the size can be reduced. Further, as shown in
FIG. 3, a through hole 9 is formed in the printed circuit board 8 and an end portion to be an
output end of the piezoelectric element 4 is inserted and fixed in the through hole 9. The
converter circuit will be connected via the pattern or conductor 10. By inserting the thusconstructed electro-acoustic transducer into the ear canal, the tip of the projection 2 of the case
1 contacts the wall of the ear canal, that is, the bone of the ear canal. In this state, when the bone
part vibrates due to vocalization, the case 1 moves up and down and a force proportional to the
acceleration of the vibration is applied to the piezoelectric element 4 so that the piezoelectric
element 4 generates an output proportional to the force . This output is impedance-converted by
the above-mentioned impedance conversion circuit and then supplied to an amplifier (not shown)
through the cord 6. Although the above embodiment describes the ear microphone 5-, the
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present invention is not limited to the ear microphone but is applicable to other microphones
using a piezoelectric element or earphones as an electro-acoustic transducer. Further, by using a
plurality of piezoelectric elements 4 and appropriately combining resonance frequencies that
change due to differences in length, material, and the like, high sensitivity and wide-band
electric-acoustic transducers can be obtained. As described above in detail, by fixing each
soldered element or cord with a synthetic resin, an element that is strong against vibration,
impact etc. and excellent in moisture resistance etc. is obtained, and the reliability of quality is
improved. Greatly improved.
4. Brief description of the drawings FIG. 1 is a cross-sectional view of one embodiment according
to the present invention, FIG. 2 is a cross-sectional view of another embodiment according to the
present invention, and FIG. Be a cross-sectional view of the connection portion with the printed
circuit board. Explanation of symbols of main parts 1 иииииииииииииииииииииии Piezoelectric element 5
ииииииииииииииииииииииииии transistors 6-EndPage: 27 ......... synthetic resin 8 ......... PCB ░ applicant Pioneer
Attorney Attorney FujiToshi Motohiko "7-second district absolute 3WJEndPage : ?
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