JPS60103798

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DESCRIPTION JPS60103798
[0001]
FIELD OF THE INVENTION The present invention relates to a displacement-type bone conduction
microphone, and more particularly to a displacement-type bone-conduction microphone in which
an electroacoustic transducer is broken. (Prior Art) First, a conventional displacement
microphone will be described. FIG. 1 shows an external perspective view of a conventional
displacement-type bone conduction microphone. FIG. 2 is a perspective view of FIG. 1 with one
damper member removed. As shown in FIG. 2, a strip-shaped electroacoustic transducer 2 such
as a bimorph made of a piezoelectric member such as barium titanate magnet is implanted in the
support member 1. A lead wire 3 is electrically connected to an end of the electro-acoustic
transducer 2 on the support member 1 side, and the lead wire 3 penetrates the support member
1 and is led to the outside of the microphone ing. The other end of the electroacoustic transducer
2 is an open end. As shown in FIG. 1, a cylindrical damper partial wing 4 formed of a silicon mold
or another rubber-like material is provided around the strip-shaped electroacoustic transducer 2.
There is. The diameter of the circular cross section perpendicular to the central axis of the
damper member 4 is formed to be approximately the same as or slightly smaller than the
diameter of the ear hole, and the damper member 4 can be inserted into the ear hole There is. In
the displacement-type bone conduction microbon having the above structure, when the microbon
is inserted into the ear canal, the damper member 4 is flexed by the bone conduction sound
transmitted to the ear canal, whereby the electroacoustic transducer 2 also flex. For this purpose,
the bone conduction sound is converted by the electroacoustic transducer 2 into an electrical
signal, which is sent via the lead 3 to a not shown subsequent device connected thereto. This
conventional displacement-type bone-conduction microphone has a merit that it picks up only
the bone conduction sound well, is completely insensitive to air vibration noise such as noise, and
is hard to cause howling. However, since the electroacoustic transducer is mechanically fragile,
there is a drawback that it is necessary to pay sufficient care in handling so as not to break by
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applying unnecessary external force. Therefore, the inventor made a prototype of a
displacement-type bone conduction microphone having a structure in which << the
electroacoustic transducer as shown in FIG. 3 was broken. That is, three non-flexible piano wires
5a, 5b and 5c7i are set up at three points on the support member 1 and around the
electroacoustic transducer 20, and they are molded with silicon resin so as to wrap them. , The
damper 1 member 4 was formed. According to this prototype example, even if an unnecessary
external force is applied to the first damper member 4, the first damper member 4 is reinforced
by the three piano wires 5a, sb + and 5c, and therefore does not bend.
Therefore, the sound-to-acoustic transducer 2 is also not distorted by the external force and the
destruction is prevented. However, in the displacement type bone conduction microphone of this
structure, the piano wire is effectively used as an auxiliary vibrator because the piano wire is not
deformed too hard and the piano wire and the electroacoustic transducer are separated. Because
it is not done, there is a drawback that the sensitivity to big-amp bone conduction noise is low.
There is also a conventional device in which the electroacoustic transducer is molded with a
damper material such as resin and the outside is covered with a cylindrical hard metal. In this
conventional device, the cylindrical metal is too hard to vibrate. In addition, since it does not
work effectively as a vibrator, it has the same disadvantages as described above. (Objective) The
object of the present invention is to eliminate the above-mentioned drawbacks of the prior art,
and to provide a displacement-type bone conduction microphone capable of sufficiently picking
up an electric sound transducing sound <<<, the electroacoustic transducer is broken. It is to do.
(Summary) A feature of the present invention is a displacement type bone having a strip-shaped
electroacoustic transducing element implanted on one end face of a support member, and a
damper member formed so as to enclose the electroacoustic transducing element. In the
microphone, a flexible reinforcing member is disposed around or in the vicinity of the electroacoustic transducer, and the open end of the electro-acoustic transducer and the tip of the
reinforcing member are fixed or placed close to each other. The point is that the periphery of the
electro-acoustic transducer and the reinforcing member is wrapped with the damper member,
and the reinforcing member is used as a main body or an aid for reinforcement and vibration
detection of the electro-acoustic transducer. EXAMPLES The present invention will be described
below by way of examples. FIG. 4 shows a perspective view of the structure of the first
embodiment O of the present invention. In the figure, 6 has one end engaged with the projection
1 a of the support member 1, the central part encases the periphery of the electroacoustic
transducer 20, and the other end fixed to the open end of the electroacoustic transducer 2 or
near the open end 2 shows a coil spring, such as metal or plastic, which is arranged. The other
reference numerals indicate the same as in FIG. 5 and 6 show enlarged side views in the vicinity
of the open end of the electroacoustic transducer 2. FIG. FIG. 5 shows an example in which the
other end of the coil spring 6 is wound around the open end 8 of the electroacoustic transducer
2. The other end of the coil spring 6 may be fixed to the open end of the electroacoustic
transducer 2 by soldering or by a resin or the like having a large hardness, or may be disposed
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close to each other without being fixed. Further, FIG. 6 shows an example in which the other end
of the coil spring 6 is placed on the extension of the electroacoustic transducer 2. Also in this
case, as described above, the other end of the coil spring 6 may be fixed to the open end of the
electroacoustic transducer 2 or may be disposed close to each other.
The rigidity of the coil spring 6 determined by the pitch, material, thickness, etc. is combined
with the rigidity of the molding material as the core material, and a person exerts a force in the
radial direction with a finger and does not crush even if crushed. The force in the direction
perpendicular to the axis is bent acoustically and is sized to transmit bone conduction noise. The
structure of FIG. 4 configured as described above is immersed in a liquid silicon resin placed in a
cylindrical mold, and then hardened to form a damper member that covers the coil spring 6. As a
result, a displacement-type bone-conduction microphone shaped as shown in FIG. 1 in
appearance is produced. As another manufacturing method of this embodiment, there are the
following methods. A through hole through which the support member 1 and the protrusion 1aK
electroacoustic transducer 2 can be inserted is opened. First, as shown in FIG. 4, one end of the
coil spring 6 is locked to the projection 1a. Next, secure a hole in the central portion of the coil
spring 6 into which the electroacoustic transducer 2 can be inserted, fill and cover the inside and
the outside of the coil spring 6 with silicon, harden the silicon, and partially damper Form
Thereafter, the electroacoustic transducer 2 is inserted into the hole secured in the central
portion of the coil spring 6 through the through holes of the support member 1 and the
projection 1a. Subsequently, in order to increase the sensitivity, a silicon adhesive or the like is
poured into the gap between the electroacoustic transducer and the hole of the damper one
member to fill the gap between the electroacoustic transducer and the damper one member. In
addition, for mechanical protection of the electroacoustic transducer 2, it is good not to fill this
gap but to leave a gap between the two. According to the displacement-type bone conduction
microphone of this embodiment, the coil spring 6 is provided around the electroacoustic
transducer 2 and the damper member 4 is interposed between the coil springs 60. Stiffness is
enhanced. For this reason, even if an external force such as bending, twisting or axial pushing is
applied while the electroacoustic transducer 2 is reinforced, a large force is not applied to the
electroacoustic transducer 2 in the coil spring 6, and the electroacoustic transducer There is an
effect that damage to the element can be prevented. Moreover, according to the present
embodiment, the bone conduction outer ear vibration is replaced by a coil spring having a large
vibration area, which is a primary vibration system, via the damper member 4, and the
electroacoustic transducer 2 which is a second vibration system. The vibration is transmitted to
the tip. Thereby, an output as large as that of the microphones of FIGS. 1 and 2 can be obtained.
When a coil spring made of metal is used in this embodiment, it has the effect of shielding
extraneous electromagnetic waves and shielding electrical noise.
FIG. 7 shows a modification of the present embodiment. In this modification, a square coil spring
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6 'is used instead of the cylindrical coil spring 6 of the first embodiment. This modification also
has the same effect as that of the first embodiment. The shape of the coil spring 6.6 'is not
limited to a spiral whose cross section perpendicular to the central axis is a circle or a square,
and the cross section may be another shape such as an ellipse or a triangle. 8 and 9 show a
second embodiment of the present invention. 8 shows a perspective view, and FIG. 9 shows a
perspective view of FIG. 8 as seen from the open end direction of the electroacoustic transducer
2. As shown in FIG. In the figure, the same reference numerals as in FIG. 1.2 indicate the same or
equivalent. It is to be noted that, in FIG. 8, the damper 1 member 4 is indicated by a broken line
in order to make the description easy. In this embodiment, an electroacoustic transducer 2 and
an elongated reinforcing member 7 formed of a V-shaped cross section are embedded in the
projection 1a of the supporting member 1, and the reinforcing member 7 is bent in the middle.
The open ends of the two are opposed to each other, and then the opposite part is soldered or
fixed with a hard resin as required. Note that the facing portions do not adhere, and may be
disposed so as to be close to each other with a slight gap. The thickness or strength of the
reinforcing member 7 of the phosphor bronze plate is a thickness or strength which does not
significantly bend even when a force is applied with a human finger in a V-shaped or U-shaped
state, and acoustically The strength is chosen to be flexible enough. Therefore, even if the
microphone is roughly handled, it is not easily damaged. Further, in this embodiment, the bone
conduction outer ear vibration is transmitted to the electroacoustic transducer 2 directly or
through the damper member 4, and the reinforcing member 7 supplementarily carries the bone
conduction sound at the open end thereof. Transmit vibration to Therefore, good efficiency (,
bone conduction sound is picked up. The tenth @ shows a modification of the present
embodiment, and shows an enlarged perspective view of the vicinity of the open end of the
electroacoustic transducer 2 and the facing portion of the reinforcing member 70. In this
modification, an opening 8 is provided in the vicinity of the open end of the reinforcing member
7, and the open end of the electroacoustic transducer 2 is located in the opening 8. In the
microphones of FIGS. 8 and 10, when the damper member 4 is provided in the range of the
electroacoustic transducer 2td and the reinforcing member 7, the electroacoustic transducer 2
and the reinforcing member 7 are mounted on the support member 1 as described above. It may
be made by immersing it in a liquid silicone resin contained in a suitable mold and solidifying it,
or the reinforcing member 7 is planted on the support member 1 After that, a hole sufficient for
the electroacoustic transducer 2 to enter is secured to form a cylindrical damper member 4 of
silicon resin, and thereafter, the support member IK is formed into strips from the through holes
previously formed with the IK shadow. Shaped electro-acoustic room.
The replacement element 2 may be inserted. In addition, although the example which provided
only one reinforcement member 7 of a phosphor bronze board is shown by FIG. 8, it is not
limited to one but you may provide multiple reinforcement members of the same shape.
Although the example which bent the reinforcement member 7 of a phosphor bronze board was
shown in the example, it is needless to say that you may curve. A third embodiment of the
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present invention is shown in FIG. In the figure, the same reference numerals as in FIGS. 1 and 2
denote the same or equivalent parts as those in these figures. A feature of this embodiment is
that a large number of slits 10 cut in the circumferential direction around the electroacoustic
transducer 2. It is a point surrounded by a thin brass or the like made of a thin brass or the like
10 having a hole of 10 'or other shape and filled and covered with a damper member 4 made
entirely of a silicon resin. The slit 10 ′ is provided substantially symmetrically with the slit 10
with respect to the center line of the cylindrical body 9. Therefore, when a force in the left and
right direction (arrows a and b in the figure) is applied to the damper member 4, bending occurs
in the same direction. This deflection is transmitted to the electroacoustic transducer 2 through
the rod member 11 fixed at one end fixed at the open end of the cylindrical body 9 in the
diameter direction. Therefore, the bone conduction sound transmitted from the ear canal can be
picked up well. Further, since the electro-acoustic transducer 2 is surrounded by the cylindrical
body 9, the deflection is small even if the unnecessary outer side is added, so it is not broken.
FIG. 12 shows a perspective view of a fourth embodiment of the present invention. In this figure,
the same reference numerals as in FIGS. 1 and 2 indicate the same or equivalent. A feature of this
embodiment is that the periphery of the electroacoustic transducer (not shown) is covered with a
fibrous sleeve 2 made of metal or glass fiber mesh or the like, and the inner and outer sides of
the sleeve 12 are made of silicone resin. It is molded by the member 4. In this embodiment, since
the electroacoustic transducer is covered with the fibrous sleeve 12 and the silicone resin, it does
not cause a large deflection even under a large external force. Therefore, it becomes difficult to
be destroyed by external force. On the other hand, with respect to bone conduction sound, the
fibrous sleeve and the electroacoustic transducer covered with silicone resin should be
sufficiently bent to the extent that the bone conduction sound is converted into an electric signal
and be picked up with high sensitivity. Can. In addition, the third. In the fourth embodiment, the
cylindrical body 9 and the fibrous sleeve 12 may have an elliptical cross section perpendicular to
the central axis. Also, when the cylindrical body 9 and the fibrous sleeve 12 are made of metal
and metal mesh, it has the effect of shielding extraneous electromagnetic waves and shielding
electrical noise.
The microphone of each of the above-described embodiments is covered with a damper member
having an impedance similar to the mechanical impedance of the outer ear guiding wall, so that
when the microphone is mounted on the outer ear guiding wall, the bone conduction sound is
damped from the outer ear guiding wall It is transmitted to one member almost without
reflection. Because of this, there is no loss of bone conduction energy. Therefore, bone
conduction sound is efficiently transmitted from the outer ear wall to the microphone. Next, the
bone conduction sound is picked up by the prototype displacement bone conduction microphone
shown in FIG. 3, the microphone of the first embodiment of the present invention of FIG. 4, and
the microphone of the second embodiment of FIG. FIGS. 13 and 14 show waveform diagrams of
the electric signal output as measured by the synchroscope. The A and B views of FIG. 13 are
shown by the microphones of FIGS. 8 and 3, respectively. The wave form diagram of the electric
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signal output at the time of picking up the bone conduction sound of "oh, yeah, yes" is shown.
Also, FIGS. 14A and 14 are waveform diagrams of the electric signal output when the bone
conduction sound of [う, 、, 、, い] is picked up by the microphones of FIGS. 8 and 4,
respectively. Indicates Referring to FIGS. 13 and 14, it can be seen that the prototype
microphone according to FIG. 3 has very poor pickup sensitivity of bone conduction sound. Also,
it can be seen that the microphone of the first embodiment of FIG. 4 has the best sensitivity, and
the sensitivity of the microphone of the second embodiment of FIG. 8 is slightly worse than that
of the first embodiment. However, it was found that the microphone of the second embodiment
as well as the microphone of the first embodiment has sufficient sensitivity in practical use, and
the latter is not inferior to the former in any way. (Effects) As described above, according to the
present invention, since the strength of the electroacoustic transducer, which was originally
considered as the weak point of the displacement bone conduction microphone, can be
sufficiently reinforced, it is possible to deal with some rough handling There is a big effect that it
will not be damaged. In addition, there is an effect that the bone conduction sound can be picked
up with the same sensitivity as the microphones shown in FIG. 1 and FIG.
[0002]
Brief description of the drawings
[0003]
1 and 2 are an external appearance perspective view of the conventional displacement bone
conduction microphone and a perspective view of the microphone with the one member of the
damper removed from FIG. 1, respectively, and FIG. 3 is an electroacoustic conversion made by
the present inventor. FIG. 4 is a perspective view of the main part of the first embodiment of the
present invention, and FIG. 5 and FIG. 6 are the opening of the electroacoustic transducer of the
first embodiment. FIG. 7 is a side view showing the relationship between the end and the open
end of the coil spring, FIG. 7 is a perspective view of a modification of the first embodiment, and
FIGS. 8 and 9 are perspective views of the second embodiment of the present invention. FIG. 10
is a perspective view of an essential part of a modification of the second embodiment, and FIGS.
11 and 12 are a perspective view of the 31st embodiment of the present invention, and FIGS. 13
and 14 respectively. In the figure, the bone conduction sound is picked up by the microphones of
FIG. 3, FIG. 4 and FIG. 8 respectively. Shows a waveform diagram of an electrical signal output
when the.
DESCRIPTION OF SYMBOLS 1 ... Support member, 2 ... Electro-acoustic conversion element, 4 ...
One member of dampers, 6.6 '... Coil spring, 7 ... Reinforcement member, 9 ... Cylindrical body, lO.
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... slit, 12 ... fibrous sleeve representative patent attorney flat wood road evildoer FIG. 8 No. 10
Figure 6 1 emissions Figure 7 Figure 5 Figure 4 Figure 3 Figure 2 Figure 1 1 persons Fig. 9 Fig.
11171 Fig. 12
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