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JPS5979699

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DESCRIPTION JPS5979699
[0001]
The present invention is applied to an ear microphone which detects vibration of an object and
converts it into an electric signal, for example, detects bone conduction vibration generated when
a person speaks by wearing in an ear canal and converts it into a sound electric signal. Relates to
a vibration detection device to be obtained. Heretofore, a vibration detection apparatus of this
type, for example, a vibration detection apparatus used for an ear microphone has been used
which has a structure as shown in FIGS. This vibration detection apparatus uses a force 1 stack,
and in FIG. 1, 1 is a metal cylinder formed in a shape that can be inserted into the ear canal, a
case made of a synthetic resin or the like, and 2 is a case of the case 1 Similarly, a support made
of synthetic resin to be fitted into the opening, 3 is a piezoelectric element fixed at one end to the
crucible support 2 and supported in a cantilever manner, and the output is taken out to the
outside by the lead 1j) 3a. ing. Thus, when the wearer speaks, the voice vibration due to bone
conduction is transmitted to the case 1 and transmitted from the case 1 to the pressure * rudder
3 via the support 2. Therefore, the pressure vt element 3 vibrates, and the output is obtained as
an electrical signal through the lead i3a. By the way, the above-described piezoelectric element 3
produces a very high peak at a certain frequency as shown by the frequency characteristic of FIG.
Therefore, it has the disadvantage that the sensitivity is extremely good at the peak frequency
and low in the other bands, and pressure 1! In addition to generating the inherent noise of the
power, there is a disadvantage that the connection of the lead i3a to the piezoelectric element 3
is m1 and so on. The present invention is intended to correct oblique defects, and the object of
the present invention is to obtain an output of desired frequency characteristics with good
sensitivity as well as small size and high output. To provide an easy vibration detection device.
Next, the present invention will be described with reference to FIG. 3 and the following examples
of 'JAM when the electret is used. In FIGS. 3a and 3b, 4 is a cylindrical bottomed case made of
metal, 5 is a spacer to a ring-shaped gold inserted into the bottom of the case 4, and 6 is a gold
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v4 deposited on a metal foil or polyester film. The peripheral portion of the movable spacer is
electrically connected to the metal spacer 5 so as to be stretched and fixed. In the present
embodiment, the thickness of the metal foil and the metal deposition layer is a dog, and the
weight of the movable electrode 6 is increased by using the eleventh weight. A ring-shaped
insulating spacer T is superimposed on the other surface of the movable electrode 6, and a
support 8 made of an insulating material such as synthetic resin is superimposed on the
insulating spacer 7. Recesses 8m and 8b are formed on both sides of the support body 8.
Reference numeral 9 denotes a fixed electrode fixed in a contact layer in the recess 581 L of the
support 8, and the electret 10 permanently holding a charge is attached to the surface
corresponding to the movable 11 t pole 6. A field effect transistor (FgT) 11 is embedded in the
recess 4 ab of the support 8 and its contact -41 is crimped to the fixed electrode 9. A printed
wiring board 12 is superimposed on the support 8. The ground pattern 121L and the signal
pattern 12b are formed on the exposed surface, and the source 111) and the drain 110 of the
FIC'll are connected to each other. As described above, until the 11th part is completely inserted
into the case 4, all the parts are fixed by caulking by pointing the opening 4a of the case 4
inward. Next, to explain the operation based on the above-mentioned structure, when vibration is
applied to the case 4 now, the movable electrode & 6 vibrates, and the capacitance change with
the fixed electrode 9 remains, which is: ¥ L A signal is applied to the FET 11. That is, the voltage
V applied to the FET I1 is v = q / c. Note that Q is the charge of the electret 10, C is acceptable
and the electrode 6 is fixed 1! It is the capacity between pole 9 Here, the reason for providing
FRT11 is to lower the impedance because the impedance of the signal to be output is high. Then,
the source 11C of the FRT 11 is connected to the case 4 via the grounding turn 121L of the
printed wiring board 12 and is grounded. A circuit for reducing the impedance by connecting
FKT11 is shown in FIG. As described above, the movable electrode 6 vibrates well against
external acceleration vibration due to the weight of the deposition layer, so a large output voltage
can be obtained and a high output as a whole is flat as shown in FIG. It becomes a frequency
characteristic. Further, in the present embodiment, since the fixed electrode S and the gate 111I
of the FET I 1 are enclosed by the case 4, even if it is an output of impedance, it is possible to
remove the induction noise by shield fruit. it can. FIG. 5 shows a water directional
communication device in the ear canal attached with the lifting detection device of the present
invention described above. And B, an insertion body made of a material such as zinc die cast or
the like which is inserted into the external auditory canal, and a fistula hole B and a mounting
hole B are formed. In the mounting hole B, the above-described vibration detecting device is
inserted and fixed. An external damper 0 is adhesively fixed to the back surface of the insert B,
and is formed of molded silicone rubber or urethane rubber having a hardness of 10 ° or more.
The external body identified in the insert B via the DFi external damper 0 is made of a material
that is bulky like the insert B. And a speaker storage part is formed in this outer body. E denotes
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a speaker, which is housed in a speaker housing in a state of being floated by a speaker damper y
made of a squeegee of the elastic coefficient (for example, a molded article of silicone gel capable
of holding a predetermined shape). G is a sound 4 tube made of a thin silicon tube having a large
elastic coefficient, one end of which is connected to the sound emitting portion of the speaker X,
and the inside of the coin through hole B of the insert B through the space of the external
damper C Is inserted in the The other end of the sound conduit G is connected to a metal pipe,
and the tip is opened at the tip of the insert B. I is a metal foil. A material having a large elastic
modulus is used to make the ive H elastically support the insert B as a sound damper. That is, the
same material as the damper F of the speaker E is used. The vibration detecting device and the
lead X from the speaker X are connected to E, with J 1-1 as a relay substrate fixed to the surface
of the outer body. And, since the high elasticity coefficient is required for the lead wires 1 and
E2, extra thin strands are used. K lead person, and E! The outer lead wire L connected to the
outer sheath 1 is an outer sheath molded by molding the outer lead 1M and the outer lead 1M.
The lead wire is connected to the transmitter via the external lead K, and the lead wire E is
connected to the communication device via the external lead K as well. Next, the operation will be
described. The voice generated by the user is transmitted to the insertion body B as bone
conduction vibration and converted from vibration to an electrical signal by the vibration
detecting device. And this sternship is impedance-transformed by the impedance conversion
circuit, is inserted into the external lead K K via the lead wire 5 and the relay board J, is sent to
the transmitter by the external lead, and is radiated with radio waves 17 Be transmitted to the
other party. On the other hand, the other party's voice No. 16 was injured by the father's IN
machine as no forest or by wire, and the external lead # ll K. It is transmitted to the speaker X via
the lead wire E. Therefore, the speaker wing is driven and the sound is emitted into the ear canal
via the v2 # pipe G1 metal pipe H. By the way, the frequency characteristic of the attenuation of
the voice received while being transmitted to the ear canal by bone conduction attenuates
substantially linearly on a logarithmic scale as the frequency increases.
Therefore, in order to make the microphone close to the voice generated from the mouth and to
increase the intelligibility, it is necessary to correct the frequency within the necessary voice
band. The non-invention is the above-mentioned swing! When the l1 II recognition device is
applied to the above-mentioned 17 in-ear canal communication device, the above-mentioned
frequency characteristic due to bone conduction is i6 cured, and FIG. A hole 6a and a slit 6b are
formed in the pole 6 at I21 'so as to follow well the vibration of the core ′ 1IJJ bipolar electrode
6, particularly in the high region. When the hole 6a and the slit 6b are formed in the movable
electrode 6 as described above, the characteristic is as shown in FIG. The output of can be
obtained. The shapes of the holes 6 & and the slits 6 b are not limited to those illustrated. FIG. T
a is a thick ν (1 fixed to an elastic body 60 such as rubber on the movable width of the movable
□□□ pole 6, which prevents the movable pole 6 from vibrating and coming into contact with
the electret 10 It is provided in order to Since a high direct pressure is applied between the fixed
electrode 9 and the negative electrode 6, the two arms 111 are electrically attracted to each
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other so that contact is likely to occur. I try not to. In the MT diagram, a resistor 6d made of butyl
rubber or the like is fixed to the movable uJ electrode 6 and is provided to prevent QtDm
resonance at the natural vibration frequency of the pole 6 having movable. Then, the resistor 6d
is attached to lower Q to obtain desired frequency characteristics at P9 '. In addition, in the
above, although it was clear about one match of an electret, it is applicable also to an
electrostatic type thing. According to the present invention, as described above, the movable
electrode is made to be a pair of movable electrodes while the movable electrode is made to be
an electrode, and a gold kA layer having a thickness greater than that of the electrical function is
formed. The small size and good detection of the vibration applied to the case, the sensitivity is
good and the large facing area makes it possible to obtain a large output, and when applied to an
ear microphone, form a hole or slit in the movable electrode Thus, it is possible to correct the
reduction of high frequency due to bone conduction and obtain flat frequency characteristics as
an output.
[0002]
Brief description of the drawings
[0003]
1a and 1b are a cross sectional view and a b-b cross sectional view on the N, respectively, of a
vibration detecting device using a conventional piezoelectric element, FIG. 2 is a frequency
characteristic view, and FIGS. 3a and 3b relate to the present invention Fig.4 is a circuit diagram
of the device according to the present invention, Fig.5 is a cross-sectional view of the water valve
194 * Idt applied to the internal ear canal dual talk device, Fig.5 6a-c are front views of various
shapes of the first ilIl electrode, and FIGS. 1a and 1b are front views in the case where an elastic
body and a resistor are fixed to the movable '6 and others.
4 ・ ・ ・ case, 6 ・ ・ ・ movable? 11 poles, 9 ... fixed 1 turn 10 ... electret. (11) Fig. 1 (b) (a)
Fig. 2 Circumstances → also Q 1-1 Changoff
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