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JPS5979700

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DESCRIPTION JPS5979700
[0001]
The present invention is applied to an ear microphone that detects vibration of an object and
converts it into an electrical signal, for example, detects bone conduction vibration that occurs
when a person speaks by wearing it in the ear canal and converts it into audio tm electric signal
Relates to a vibration detection device to be obtained. In the past, this type of vibration detection
apparatus of this type, for example, a vibration detection apparatus w used for an ear
microphone, had a structure as shown in FIG. This vibration detection device is one in which a
piezoelectric element is used for drinking, and in the figure, 1 is a case made of metal or a wood
sheet Bh which is formed into a shape that can be inserted into the ear canal, 2 is an opening of
the case 1 In the case of a piezoelectric element having one end fixed to the support 2 and
supported in a cantilever manner, the output is taken out to the outside by the lead wire 3 & 3.
There is. When the wearer speaks, voice tremor due to bone conduction is transmitted to the
case IK, and the pressure from the case 1 through the support 2 is 1! It is transmitted to the
accumulator 3. Accordingly, the pressure vL element 3 vibrates, and the output thereof is
obtained as an electrical signal through the lead wire 3. By the way, the piezoelectric element 3
described above 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 high at
the peak frequency and low in the other bands, and noises inherent to the piezoelectric element
are generated, and the connection of the lead wire 3a to the pressure RL element 3 is not good.
And so forth. Non-progressive IJI is intended to correct paper defects, and its purpose is to obtain
a small and wide output with good sensitivity, and to obtain an output with a desired frequency
characteristic. Is to provide a simple vibration detection device red. Next, an example in the case
of using an electret will be described with reference to FIG. 3 and subsequent figures. In FIGS. 3a
and 3b, 4 is a cylindrical bottomed case made of metal, 5 is a ring-shaped metal spacer inserted
into the bottom of the case 4, and 6 is a gold-fumigated gold M foil or polyester film. The
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periphery of the metal spacer 5 is in electrical contact with the metal spacer 5 and fixed at a
tension of 1λ so as to form an adjustable 4 vJ electrode subjected to a treatment of −ij 吟. In
the present embodiment, at least one side has a weight 6! By sticking L, the quality 11 of the
movable electrode 6 is substantially increased. T is a ring-shaped insulating spacer, 11 is fitted to
the other surface of the movable electrode 6, 8 is a combination! The insulating spacer I is used
as a support made of an insulating material such as a plastic resin or the like.
And in this 9% body B, the recessed parts 8m and 8b are formed in both 1111's. 9 are fixed fixed
in the recess 8 a of the support 8 111. As a pole, an electret 10 permanently affixed with a
charge is affixed to the surface corresponding to the upper-river mit electrode. Reference
numeral 11 denotes a 1 W field effect transistor (FET), which is embedded in the recess 111 tab
of the support 8, and its gate 111 L is crimped and connected to the upper fixed electrode 9. A
ground pattern 121L and a subdivided pattern 12b are formed on the exposed surface of the
printed wiring board 12 superimposed on the support 8 described above, and the source 11b
and the drain 110 of the FKT 11 are connected to each other. After the Iir + next part is inserted
17 into the case 4 as described above, the opening 4a of the case 4 is bent inward to form all
parts by caulking. Next, based on the above-described structure, when assistance is added to the
case 4, the movable electrode 6 vibrates, and a change in mass occurs with the fixed electrode 9,
and this is an electric case. Is applied to the FET 11 as the That is, the voltage V applied to FKT11
is V, -Q10. Here, Q is the charge of the electret 10 and C is a six value between the movable
electrode 6 and the fixed electrode 9. Here, the reason why FITCTI 1 is provided is to lower the
impedance because the impedance of the signal to be output is high. The source 110 of the FET
11 is connected to the ground of the printed P-wire plate 12 (connected to the case 4 via the turn
12a and grounded). A circuit for reducing the impedance by connecting the FET 11 is shown in
FIG. As described above, the movable electrode 6 vibrates largely with respect to the external SW
due to the weight of the vapor deposition layer, so a large output voltage can be obtained and a
high output flat as a whole as shown in FIG. It becomes a frequency characteristic. In the present
embodiment, since the fixed electrode 9 and the gate 111L of the FKT11 are surrounded by the
case 4, even if the output is high impedance, the noise can be eliminated by the shielding effect. .
FIG. 5 is a water directional communication device in the ear canal attached with the vibration
detection device according to the present invention as described above (2, Br [formed by a
material of +1 barrel dog of die-cut die cast rejection lead pushed into the ear canal In the
inserted insert 1. The through hole B1 and the mounting hole B are formed. そしてこのJIV。
Inside the tag B, the above-described vibration detection @ e # person has a close friend 'iE. C is
solidly bonded 2j on the back of insert B!
The external damper is made of molded silicon rubber having a hardness of 10 ° or more and
urethane rubber. And a speaker storage part is formed in this outer body. E denotes a speaker,
which is housed in a speaker housing in a state of being floated by a speaker damper F made of a
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material having a high elastic coefficient (for example, a molded product of silicone gel capable
of holding a predetermined shape). G is a sound conduit made of a thin silicon tube having a
large elastic coefficient, one end of which is connected to the dead part E of the Sbee force E, and
the through hole B of the insert B through the space of the external damper C Is inserted in the H
is metal pine to which the other hi of the acoustic tube G is connected, and the tip is opened at
the tip of the insert B. (2) A sound conduit damper which is elastically supported on the fulllength pipe H and the insert B is made of a material having a large elastic coefficient. That is, a
material similar to that of the damper F of the upper-mouthed speaker E is used. J is a relay
substrate fixed to the surface of the outer body, and the vibration detection device, lead wires
from the speaker E, and E are tangent to each other. And for this lead wire insertion and E, since
the elastic modulus of elasticity is required, the extra thin wire is used for one history. K is an
external lead wire connected to the lead persons 1 and E via a relay base & J, L is an outer
surface of the outer body, which is molded on the external lead wire. The lead wire is connected
to the transmitter via the external lead 1ilK, and the lead 1h is also connected to the receiver via
the external lead K. Next, to describe the operation, the voice generated by the user is transmitted
to the insert B as bone conduction vibration, and the vibration detection device converts the
vibration into an electric signal. Then, this * Air lTh is converted in impedance by the impedance
conversion circuit, sent out to the external lead K via the lead wire 2 and the relay substrate J,
sent to the transmitter by the external lead gland, and radiated with radio waves and 1- (Or
wired) and transmitted to the other party. On the other hand, the voice transmission from the
other party is paved as a radio signal by wounded reconnaissance or wired by wire, and the
speaker EK is transmitted to the external lead wire via one lead wire E. Accordingly, the speaker
X is driven and the sound is emitted into the ear canal via the sound 2 # tube G1 gold end 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 decreases 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 make it clearer, it is necessary to correct the frequency within
the necessary voice band.
The present invention forms holes 6b or slits 6C in the movable electrode 6 as shown in FIG. I
made it follow the vibration of, especially in the high region. Thus, when the hole 6b and the slit
60 are formed in the center vn = e, the height increases from low to high as shown in the
characteristic C of FIG. 2, so that the frequency characteristic by bone conduction can be
corrected and the characteristic is flat. The output of can be obtained. The shapes of the holes 6
b and the slits 60 are not limited to those illustrated. FIG. 7a is an elastic body 6d made of rubber
or the like fixed to the side of the movable electrode 6 having a large vibration width, and is
provided to prevent the movable electrode 6 from moving and contacting the electret 10. It is a
thing. Since a clamping voltage is applied between the fixed electrode 9 and the movable
electrode 6, the two electrodes 9.6 are electrically attracted to each other so that contact is likely
to occur, and thus no large shock is caused even if they come in contact. It is like that. Further, in
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FIG. 7, a resistor 6e such as butyl rubber is fixed to the movable electrode 6, and it is provided to
prevent high resonance of Q at the natural vibration frequency of the movable electrode 6. Then,
this resistor 6d is attached to lower Q to make it have a desired frequency response. In addition,
1 夾! Although the shell 61L and the elastic body 6d or the resistor 6e are different from each
other, it is also possible to make the elastic body 6d or the resistor 6e play a role of 11 = lik.
Moreover, although the case of the electret was demonstrated above, it can apply also to the
electrostatic type thing. According to the present invention, as described above, the movable
electrode is opposed to the fixed electrode and 1 pl is attached to at least the piece 11 II of the
movable electrode to increase the mass of the movable electrode, thereby reducing the size and
the vibration applied to the case. A large output is obtained from the fact that the sensitivity is
good and the face-to-face interview is large, and when applied to a single-ear microphone, holes
and slits are formed in the movable electrode to correct a drop in elevation due to bone
conduction. Thus, it is possible to obtain an effect that flat frequency characteristics can be
obtained as an output.
[0002]
Brief description of the drawings
[0003]
1a and 1b show 4jltb view and b-b cross-cut view of the vibration detection device M using the
conventional exit chamber cord, FIG. 3a shows a frequency characteristic view, and FIG. 3a and b
show the present invention 4 is a cross-sectional view of the device according to the present
invention applied to an ear-progressive two-way communication device, FIG. 4 is a cross-sectional
view of the vibration detection device according to FIG. 6a-0 are positive + 'in views of various
shapes of the movable t &', and FIGS. 7a and 7b are front views when the movable [the elastic
body and the resistor are fixed to the pole.
4 · · · Case, 6 · · · movable electrode 6a · · · weight, 9 · · · fixed ffl &, 1 G · · · electret. 1 () Fig. 1 (b)
(a) Fig. 2 Circumference-backstep-step t0
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