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DESCRIPTION JP2005167596

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DESCRIPTION JP2005167596
An object of the present invention is to provide an ear-mounted sound information transmitter
which detects bone conduction sound with high detection accuracy. According to the present
invention, an ear worn type sound information transmitter according to the present invention is
mounted on a person's ear, and includes an ear worn type sound information provided with a
microphone unit C for detecting voice vibration transmitted to cartilage of the person's ear. The
microphone unit C is a transmitter, and detects the sound vibration transmitted in the direction
of the microphone axis, and also detects the sound vibration transmitted in the direction
substantially perpendicular to the direction of the microphone axis. [Selected figure] Figure 2
Ear-mounted sound information transmitter
[0001]
The present invention relates to an ear-mounted sound information transmitter using boneconducted vibration of sound, and more particularly to a structure of a pickup sensor for
detecting bone-conduction sound of the ear-mounted sound information transmitter.
[0002]
In recent years, with the spread of mobile phones and mobile devices, diversification of use of
these devices has significantly progressed.
As an example, for example, at the time of a call of a mobile phone, a microphone unit and an
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earphone unit can be easily attached to the concha cavity, and a miniaturized ear-mounted type
can be used to make a call without bothering the user. Sound information transmitters began to
be used.
[0003]
Such ear-worn sound information transmitters are used in places with high ambient noise. From
this, in order to reduce the influence of ambient noise, various developments have been made,
such as using a bone conduction microphone. In these compact types of ear-worn information
devices, each component is required to have high performance at the same time due to
limitations in its shape, weight, installation area, and the like.
[0004]
In the conventional ear-worn sound information transmitter, the microphone unit is variously
devised to more accurately detect the sound vibration accompanying the user's speech. Examples
thereof are disclosed in Patent Document 1 and Patent Document 2. In general, human voice is a
vibration associated with the flow of air generated in the vocal cords, oropharynx, teeth, lips and
the like. This vibration is emitted from the mouth to the outside as an air conduction sound (air
conducted sound), and at the same time, the vibration is transmitted as a vibration from a
generation site such as vocal cords and oropharynx to a living human body (body including bone)
. It is a bone conduction sound information device that utilizes the vibration (referred to as bone
conduction sound) propagating through the living body as sound.
[0005]
In the propagation of bone conduction sound in the living body, the loss due to the propagation
speed or propagation differs depending on the material of bone or meat (living tissue other than
bone), the path of propagation from the generation site, and the like. Therefore, when the
detection sensor is simply fixed to a part of the living body, and the bone conduction sound is
detected and reproduced, the high region of the bone conduction sound is attenuated and sounds
like a "komori sound". In addition, there are problems such as detection and reproduction of the
sound transmitted through the bones, and listening to "high sound" shifted to a high frequency.
Therefore, the bone conduction voice information device needs to detect this vibration efficiently
and to detect a vibration (a vibration having a similar vibration component) as similar as possible
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to the air conduction sound emitted from the mouth. JP-A-9-163476 JP-A-2000-261875
[0006]
As described above, in the ear-mounted type sound information transmitter using the
conventional bone conduction system, the bone conduction sound sometimes sounds like a
"komori sound" or "high-pitched sound" far apart from the air conduction sound transmitted
through the air. There was a problem of that. The present invention has been made to solve such
problems, and an object of the present invention is to provide an ear worn type sound
information transmitter which detects bone conduction sound with high detection accuracy.
[0007]
The ear-worn sound information transmitter according to the present invention is an ear-worn
sound information transmitter equipped with a microphone unit which is attached to a human
ear and detects sound vibration transmitted to the cartilage of the human ear. The microphone
unit detects a first sound vibration transmitted in the direction of the microphone axis and
detects a second sound vibration transmitted in a direction substantially perpendicular to the
direction of the microphone axis.
[0008]
Furthermore, a detection unit is built in the inside of the microphone unit, and the detection unit
is supported in an inclined state so that the main detection direction is defined by the main body
axis and the microphone axis.
Preferably, the detection unit is supported such that an angle between the main detection
direction and the microphone axis direction is 30 degrees to 60 degrees. Further, the detection
unit is supported such that an angle formed by the main detection direction and the microphone
axial direction is approximately 40 degrees to 50 degrees.
[0009]
Furthermore, the microphone unit is movable in both the microphone axis direction and the
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direction substantially perpendicular to the microphone axis direction. Preferably, the
microphone unit has a holding foot for attaching to the main body, and the holding foot is held
by the gel member and movably held on the main body by the elasticity of the gel member. .
Further, the gel member has a first gel member sandwiching the lower side of the holding foot,
and a second gel member having a rigidity lower than that of the first gel member sandwiching
the upper side of the holding foot. It consists of
[0010]
Preferably, the first sound vibration is sound vibration transmitted in the direction of the
microphone axis from the vicinity of the ear canal in the ear portion, and the second sound
vibration is a bottom portion of the concha cavity portion of the ear portion. To the microphone
axis direction.
[0011]
Further, the ear worn type sound information transmitter according to the present invention
further comprises an earphone unit for outputting a sound wave.
[0012]
In such a configuration, the inclined and supported detection unit can detect the first and second
voice vibrations transmitted in the direction substantially perpendicular to the direction of the
microphone axis.
As a result, it is possible to detect bone conduction sound with high detection accuracy and to
make the detected bone conduction sound close to air conduction sound, and it is possible to
detect bone conduction sound with less discomfort similar to air conduction sound.
[0013]
On the other hand, the ear-mounted type sound information transmitter according to the present
invention is provided with the body and the body projecting from the body, and detects the
sound vibration transmitted to the cartilage of the ear in a state of being mounted on the ear of a
person. An ear-mounted type sound information transfer device including a microphone unit
incorporating a detection unit, wherein the main detection direction of the detection unit is
defined by a main body axis and a projection axis from the main body of the microphone unit It
is supported in an inclined state so as to be in between.
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[0014]
Furthermore, the microphone unit has a holding foot for attaching to the main body, and the
holding foot is held by a gel member contained in the main body, and the elasticity of the gel
member causes the main body to It is held movable.
Preferably, the gel member has a rigidity lower than that of the first gel member sandwiching the
lower side of the holding foot, and a second gel sandwiching the upper side of the holding foot
lower than the first gel member. It consists of a member, and the said holding | maintenance foot
part is hold | maintained at the said main-body part so that it can rotate centering | focusing on
the clamping part by the said 1st gel member by the rigidity of the said 1st and 2nd gel member.
[0015]
In such a configuration, the inclined and supported detection unit can detect the sound vibration
transmitted in the axial direction of the main body portion and the projecting axial direction.
As a result, it is possible to detect bone conduction sound with high detection accuracy and to
make the detected bone conduction sound close to air conduction sound, and it is possible to
detect bone conduction sound with less discomfort similar to air conduction sound.
[0016]
Furthermore, an ear-worn sound information transmitter according to the present invention
comprises a microphone unit which is attached to a human ear and detects voice vibration
transmitted to the cartilage of the human ear, and an earphone unit which outputs a sound wave.
In the ear worn type sound information transmitter, the microphone unit detects sound vibration
transmitted from the vicinity of the ear canal to the ear canal direction of the ear.
[0017]
According to the present invention, it is possible to provide an ear worn sound information
transmitter which detects bone conduction sound with high detection accuracy.
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[0018]
An ear-worn type sound information transfer device according to the present invention has a
pickup sensor structure capable of detecting a bone conduction sound from a low frequency
band to a high frequency band.
Therefore, the ear-worn sound information transmitter according to the present invention is a
device that can be expanded to various uses, for example, connected to a mobile phone or a
mobile device via its radio, even in a location where the ambient noise is large, Clear voice can be
sent to the other party to make a good call.
Hereinafter, the best mode for carrying out the present invention will be described with
reference to the drawings.
[0019]
First, an ear-worn sound information transmitter according to the present invention will be
schematically described with reference to FIG. FIG. 1 is a view showing the appearance of an ear
worn sound information transmitter according to the present invention. In the following, in
addition to the drawing showing the configuration of the ear worn type sound information
transmitter and the like, description will be made by appropriately referring to FIG. 7 showing
each part of the human ear.
[0020]
In FIG. 1, A is a signal circuit board storage portion (hereinafter referred to as a substrate storage
portion A), B is an earphone portion, and C is a microphone portion. The substrate storage
portion A constitutes a main portion of an ear-mounted type sound information transfer device
according to the present invention. The substrate storage unit A amplifies the electric signal from
the microphone unit C and transmits it as a radio wave, the circuit that amplifies the radio wave
received from the outside, supplies it to the earphone, and outputs the sound or voice from the
earphone A battery, various operation buttons, a charging terminal, etc. are housed.
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[0021]
The earphone unit B is a part that outputs an electrical signal of the received sound information
as a sound wave. The microphone portion C is a portion for housing a pickup sensor, and the
pickup sensor is generated in the vocal cords, the oropharynx, the nasal cavity, etc. in the
mounting state as described later, and bones or cartilages of jaws or head , And transmits the
body, etc., and picks up the vibration caused by the voice that has reached the concha cavity 61
(see FIG. 7), which is the storage part thereof, and converts it into an electric signal.
[0022]
As shown in FIG. 1, in the ear-mounted type sound information transfer device, an earpiece
portion B and a microphone portion C protrude on the belly side of the substrate storage portion
A. As described later, both the earphone unit B and the microphone unit C are parts that are
inserted into the concha cavity 61 (see FIG. 7) of the user when used. At the same time, both the
earphone unit B and the microphone unit C have a shape for hooking and holding the entire
device on the ear. Moreover, the board | substrate storage part A is arrange | positioned in the
outer side part of the ear in the state which the earphone part B and the microphone part C were
inserted in the concha cavity part 61 (refer FIG. 7).
[0023]
Next, the ear worn sound information transmitter according to the present invention will be
described in detail. In the following, the structure of the pickup sensor in the ear worn type
sound information transmitter will be specifically described. First, the configuration of the earworn sound information transmitter according to the present invention will be described with
reference to FIG. Fig.2 (a) is sectional drawing which shows the internal structure of the ear-worn
type sound information transmitter concerning this invention. This FIG. 2 (a) is sectional drawing
which cut | disconnected the ear-wear type sound information transmitter longitudinally in the
center part. FIG. 2B is a detailed view showing a portion encircled in FIG. 2A and is an enlarged
view showing the vicinity of a vibration detection portion of the microphone unit C. As shown in
FIG. Further, in FIG. 2B, the direction D indicates the direction of the microphone axis, the
direction J indicates the main detection direction of the microphone croton C, and the direction E
indicates the axial direction of the main body. Further, the microphone axial direction D and the
main body axial direction E are the longitudinal direction of the microphone C and the
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longitudinal direction of the substrate storage portion A constituting the main body.
[0024]
In FIG. 2, 1 is a signal processing circuit board, 2 is an output line, 3 is an earphone, 4 is a sound
conduit, 5 is a back gel plate, 6 is a tip gel plate, 7 is a gel receiver, 8 is a pickup sensor, 9 is A
microphone housing 10 is a microphone gel upper, 11 is a microphone gel lower, 12 is a
microphone holder, 13 is a housing, 14 is an input line, and 15 is a sandwiching portion. Further,
16 is a battery stored in the substrate storage portion A, 17 is an operation button provided on
the upper side surface of the substrate storage portion A, and 18 is a charge terminal provided
on the bottom portion of the substrate storage portion A.
[0025]
As shown in FIG. 2A, the microphone unit C accommodates and holds the pickup sensor 8 in the
microphone housing 9. The microphone housing 9 protrudes from the housing 13 of the
substrate storage portion A. The microphone unit C is supported by the microphone holder 12
and has a holding foot 9a, a microphone gel 10, and a box 12a for accommodating and holding
the microphone gel lower 11. The holding foot portion 9a of the microphone portion C has a
structure in which it is sandwiched between the upper surface 10 and the lower surface 11 of
the visco-elastic material. Further, the microphone holder 12 is held by the housing 13 at the
outer periphery of the bowl-like portion 12b which spreads around the box body 12a. The bowlshaped portion 12 b has a corrugated cross section at its central portion.
[0026]
Further, the microphone holder 12 is made of an elastomer material having relatively good
damping characteristics, and the structure and material of the microphone holder 12 are
effective to damp various kinds of vibrations transmitted from the earphone portion B and the
substrate storage portion A and shocks such as operation vibration. Have. The microphone gel
upper portion 10 and the microphone gel lower portion 11 have characteristics of their viscoelasticity, and hold the microphone portion C so as to easily vibrate. At the same time, the high
attenuation characteristics of the microphone gel 10 and the microphone gel 11 make it difficult
to resonate at a specific frequency. In addition, the microphone gel upper portion 10 and the
microphone gel lower portion 11 also function to block and damp the vibration transmitted from
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the housing 13 to the microphone holder 12.
[0027]
Furthermore, the upper microphone gel 10 is made of a material that is relatively less rigid than
the lower microphone gel 11. Therefore, the holding foot portion 9a of the microphone portion C
is relatively fixed so as not to move by the lower portion 11 of the microphone gel in the lower
portion, and is fixed movably by the upper portion 10 of the microphone gel in the upper
portion. Since the support foot 9a is fixed in this manner, the microphone unit C can be rotated
within a predetermined range centering on the fixed portion by the lower portion 11 of the
microphone gel. Furthermore, the microphone unit C is configured to be movable in the direction
of the microphone axis, that is, to be movable by the expansion and contraction of the top 10 and
the bottom 11 of the microphone gel.
[0028]
The sandwiching portion 15 is disposed in the microphone portion C in a state of extending
obliquely downward from the microphone portion C in a tongue shape. In detail, the sandwiching
portion 18 is provided in the vicinity of the boundary between the substrate storage portion A
and the microphone portion C. The sandwiching portion 15 is formed of an elastic material such
as rubber or soft plastic material having a hardness of 50 to 80, and is capable of elastic
displacement in a flexed form. Since the sandwiching portion 5 elastically abuts on the edge of
the concha cavity 61 in a state where the sandwiching portion 5 is reliably clamped, the user can
obtain a good feeling of wearing.
[0029]
As shown in FIG. 2 (b), a pickup sensor 8 is housed inside the microphone housing 9. The main
detection direction of the pickup sensor 8 is approximately in the direction of the microphone
axis (left and right direction on the sheet, ie, direction D) and in the direction perpendicular to
the microphone axis (vertical direction on the sheet and ie, the axial direction E of the body
portion It is supported and fixed in an inclined state of 45 degrees. That is, the main detection
surface of the pickup sensor 8 is inclined by about 45 degrees with respect to the direction of the
microphone axis and the direction perpendicular to the microphone axis. In the ear worn type
sound information transmitter according to the present invention, with such a configuration,
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vibration of one pick-up sensor 8 in the direction of the ear canal 62 of the concha cavity 61
shown in FIG. A vibration perpendicular to the cavity bottom 61 is detected. Therefore, it is
possible to reliably detect both the upward vibration from the skull direction and mainly the
downward vibration from the jaw direction by one pickup sensor 8.
[0030]
The microphone unit C utilizes a bone conduction system. That is, the pickup sensor 8 stored in
the microphone housing 9 detects the sound vibration generated in the vocal cords and the like
and transmitted through the throat and the head and reaches the concha cavity 61 (see FIG. 7).
Therefore, the microphone housing 9 of the microphone unit C using the bone conduction
system contacts the skin of the concha cavity bottom surface 61a shown in FIG. 7 and the concha
cavity side 61b near the ear canal 62, and this contact It needs to move smoothly according to
the minute vibration of the skin in the department. Therefore, the microphone housing 9 has
high adhesion to the skin of the concha cavity 61 shown in FIG. 7 and is a relatively moist
material having a rigidity that contacts and does not absorb vibration from the skin, for example,
PP It is made of resin or ABS resin. Further, since the microphone housing 9 directly touches the
skin of the user, it is necessary to select a safe material in consideration of long-term use and the
like.
[0031]
The mounting state of this ear-worn sound information transmitter is shown in the schematic
view of FIG. In FIG. 3, the direction P is substantially perpendicular to the ground in the device
use posture, and the direction Q is substantially horizontal to the ground in the device use
posture. The direction Q is the microphone axis direction D, and the direction P is a direction
substantially perpendicular to the microphone axis direction D. Also, the direction P indicates a
direction substantially the same as the main body axial direction E.
[0032]
As shown in FIG. 3, in the ear worn type sound information transmitter according to the present
invention, the sound wave is transmitted from the opening at the tip of the earphone B in a state
of being inserted in the concha cavity 61 (see FIG. 7). discharge. The lower end 9b of the
microphone housing 9 of the microphone unit C is to the bottom (bottom) 61a of the concha
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cavity section shown in FIG. 7, and the front end 9c of the microphone housing 9 is an open ear
canal 62 of the lateral side 61b of the concha cavity section. It abuts near the part. In this state,
the microphone unit C mainly has a structure for detecting downward vibration from the jaw
direction and upward vibration from the skull direction.
[0033]
The clamping unit 15 is disposed near the outer edge of the concha cavity 61 in the mounted
state, and sandwiches and holds the vicinity of the outer edge. As a result, the operation and
wearing of the ear worn sound information transmitter according to the present invention can be
stabilized. In addition, the holding portion 15 may be provided with a holding reinforcing tool. By
this pinching reinforcement, the pinching interval can be narrowed, and the wearing stability of
the ear-worn sound information transmitter can be further enhanced.
[0034]
As described above, the tip portion 9c of the microphone housing 9 is reliably fixed in the
vicinity of the opening of the ear canal 62 of the side surface 61b of the concha cavity portion by
stably mounting the ear wear type sound information transfer device according to the present
invention. It can be made to abut. Further, by appropriately adjusting the protrusion width of the
microphone portion C, this contact state can be made more reliable. In particular, since the ear
worn type sound information transmitter according to the present invention is a device capable
of performing cordless communication, the substrate storage portion A is not pulled downward.
Therefore, the stable attachment by the sandwiching portion 15 can reliably maintain the contact
state of the side surface 61 b of the concha cavitation portion near the opening of the ear canal
62. Furthermore, in the ear-mounted type sound information transmitter according to the
present invention, since the substrate storage portion A is relatively lightweight, the substrate
storage portion A is not pulled downward, and this contact state can be made more reliably. Can
be maintained.
[0035]
Subsequently, the microphone unit C of the ear-worn sound information transmitter according to
the present invention will be described specifically and in detail with reference to FIGS. 4 to 6. As
described above, the microphone unit C adopts the bone conduction system in consideration of
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diversification of usage and the like. The microphone housing 9 of the microphone unit C is
shown in FIG. FIG. 4A is a plan view of the microphone housing 9. FIG.4 (b) is sectional drawing
which shows the HH 'cross section of Fig.4 (a). FIG. 4C is a side view of the microphone housing
9.
[0036]
As shown in FIG. 4A, the microphone housing 9 has a structure including a large diameter
portion 31a and a small diameter portion 31b. The distal end portion 9c of the large diameter
portion 31a abuts in the vicinity of the external ear canal 62 of the concha cavity 61 shown in
FIG. Further, the small diameter portion 31 b is a portion connected to the outer ear direction
side of the large diameter portion 31 a in the mounted state. The large diameter portion 31a and
the small diameter portion 31b of the microphone housing 9 are continuously integrated by the
connecting portion 31c. The pickup sensor 8 is housed inside the large diameter portion 31 a of
the microphone housing 9. The configuration of the pickup sensor 8 will be described in detail
later. The holding foot 9a from the base of the small diameter portion 31b is generally vertical
and protrudes downward from the mounting position, and the microphone housing 9 projects
the gel holder 12 from the housing 13 of the substrate storage portion A via the gel material. It is
fitted and rotatably supported in the axial direction of the microphone as described above.
[0037]
As shown in FIG. 4 (b), the large diameter bottom 31e of the large diameter portion 31a abuts on
the bottom surface 61a (see FIG. 7) of the concha cavity in the mounted state to accurately detect
minute vibrations. As viewed in a direction along the ear canal 62 (viewed in a direction
perpendicular to the side of the head), it is formed with a convexly curved surface on the bottom
surface 61a side of the concha cavity portion. As a result, the contact area between the large
diameter portion bottom surface 31e and the concha cavity portion bottom surface 61a is
expanded, and good contact is achieved. Further, the shape of the small diameter portion bottom
portion 31f of the small diameter portion 31b may also be formed into a shape having a convex
curved surface.
[0038]
As shown in FIG. 4 (c), the large diameter back side 31d of the large diameter portion 31a comes
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in contact with the bottom surface 61a (see FIG. 7) of the cavum conchae in the mounted state.
Therefore, the connecting portion 31c between the large diameter portion 31a and the small
diameter portion 31b is smoothly connected to improve the adhesion to the bottom surface 61a
of the cavum conchae.
[0039]
With such a configuration, the microphone unit C can freely move in the direction of the
microphone axis (horizontal direction in FIG. 2) and in the direction perpendicular to the
microphone axis (vertical direction in FIG. 2) by the expansion and contraction of the upper 10
and lower 11 of the microphone gel. Can. That is, as shown in FIG. 3, when the microphone unit
C is attached, the direction substantially perpendicular to the bottom surface 61a (see FIG. 7)
with which the large diameter bottom 31e of the microphone housing 9 abuts. The external ear
canal 62 opening of the concha cavity 61 where the P direction and the device utilization posture
are substantially vertical to the ground and in the direction substantially perpendicular to the
microphone axial direction) and the tip 9 c of the microphone housing 9 abuts Move freely in the
direction substantially perpendicular to the concha cavity side surface 61b near the head (in the
direction of arrow Q, substantially horizontal to the ground in the device usage posture, in the
direction of the microphone axis), and the movement of the contact surface It transmits to the
pickup sensor 8 located inside. Due to this movement, the microphone unit C vibrates in the
direction of the ear canal 62 (the vibration in the upper direction) of the concha cavity 61 that
emits in the vocal cords, the oropharynx, the nasal cavity, etc. and reaches the concha cavity 61
It is possible to freely move against vibrations perpendicular to the direction of the ear canal 62
of the cavity bottom 61 (the above-mentioned vibrations), and these vibrations can be reliably
detected.
[0040]
The configuration of the pickup sensor 8 of the microphone unit C is shown in FIG. FIG. 5A
shows the structure of the pickup sensor 8 in a partially cutaway view, and FIG. 5B is a crosssectional view taken along the line I-I 'of FIG. As shown in FIG. 5A, inside the small diameter
portion 31b of the microphone housing 9, a microphone substrate 45 mounted with a field effect
transistor 44 and the like for signal processing is accommodated. The microphone substrate 45
is connected to the piezoelectric element 42 by the signal line 43, and the signal processing
circuit board 1 and the microphone substrate 45 of the substrate storage portion A are
connected, and the detection signal is transmitted to the signal processing circuit substrate 1 in
the substrate storage portion A. I am telling you.
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[0041]
The shield case 41 covers the main components of the pickup sensor 8 and the entire
microphone substrate 45 on which the piezoelectric element 42, the field effect transistor 44 and
the like are mounted. As a result, the "signal-to-noise ratio (S / N) ratio" of the audio signal to be
transmitted can be maintained high. Also, the shield case 41 is made of a conductive and
magnetic material. The shield case 41 is simultaneously covered by the microphone housing 9
and protected against external mechanical force. The support fixing of the piezoelectric element
42 in the shield case 41 and the support fixing of the shield case 41 to the microphone housing
9 are performed with a sufficiently high degree of coupling to suppress the attenuation of the
vibration propagating through the support fixing portion.
[0042]
As shown in FIG. 5B, the pickup sensor 8 is housed inside the large diameter portion 31 a of the
microphone housing 9. The piezoelectric element 42 of the pickup sensor 8 is housed in the
shield case 41. The piezoelectric element storage portion of the shield case 41 is configured to be
inclined by about 45 degrees with respect to the microphone substrate 45 storage portion, and
the main detection direction of the pickup sensor 8 is inclined by about 45 degrees with respect
to the microphone axis direction to facilitate fixed support. ing.
[0043]
The pickup sensor 8 strongly supports and fixes at least the fixed end of the piezoelectric
element 42 in the longitudinal direction of the large diameter portion 31 a of the microphone
housing 9, and the piezoelectric element 42 in the pickup sensor 8 corresponds to the shield case
41 in the longitudinal direction. Only one end is cantilevered, and is supported and fixed so that
the other end can freely move within a predetermined range with respect to external force. Due
to this fixation, the piezoelectric element 42 outputs an output corresponding to the magnitude
of external vibration to its electrode terminal.
[0044]
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The main detection direction of the piezoelectric element 42 of the pickup sensor 8 is supported
and fixed at about 45 degrees with respect to the microphone axis direction and the direction
perpendicular to the microphone axis. The main detection direction of the piezoelectric element
42 is shown in FIG. 5 (c). In FIG. 5C, the angle θ between the main detection direction of the
pickup sensor 8 and the microphone axis direction is not limited to about 45 degrees, and may
be in the range of 30 degrees to 60 degrees. Furthermore, preferably, θ may be 40 degrees to
50 degrees. 5 (b) and 5 (c), the main detection direction of the piezoelectric element 42 is
indicated by "direction J", and the direction perpendicular to the main detection direction is
indicated by "direction K". With such a configuration, one pickup sensor 8 vibrates in the
direction of the ear canal 62 of the concha cavity 61 shown in FIG. 7 (the above-mentioned
oscillation) and a vibration perpendicular to the concha cavity bottom 61 (FIG. 7). The lower
vibration) is detected with certainty.
[0045]
The piezoelectric element 42 is made of a piezoelectric ceramic material such as PZT, and
electrodes (not shown) are formed on the entire upper and lower surfaces of the piezoelectric
element 42, respectively. When the piezoelectric element 42 is distorted by an external force, a
potential corresponding to the distortion is generated between the electrodes (not shown). The
generated electric signal is input from the piezoelectric element 42 to the microphone substrate
45 through the signal line 43, and transmitted from the signal terminal 45a to the signal
processing substrate circuit substrate.
[0046]
The circuit configuration of the pickup sensor 8 is shown in FIG. Although not shown in FIG. 6,
the upper electrode of the piezoelectric element 42 is connected to the gate of the field effect
transistor 44 via the signal line 43. The lower electrode of the piezoelectric element 42 is
connected to the source of the field effect transistor 44 through the ground pattern of the shield
case 41 and the microphone substrate 45. Further, the signal terminals 45a and 45b of the
microphone substrate 45 are transmitted to the signal processing substrate circuit substrate
described above.
[0047]
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With such a configuration, in the pickup sensor 8, the audio signal detected by the piezoelectric
element 42 is transmitted as a transmission voice to a mobile telephone or the like connected
from the antenna of the sound information transmitter. The mobile telephone receives the voice
signal, and transmits an electrical signal indicating transmission voice to the telephone device of
the communication partner via another communication means. This transmission signal is
received by the telephone apparatus of the other party of communication via the base station and
the communication network to make a call.
[0048]
As described above, in the ear worn type sound information transfer device according to the
present invention, the microphone portion C is supported movably with respect to the substrate
storage portion A. More specifically, since the support foot 9a of the microphone portion C is
rotatably fixed centering on the pinched portion by the lower portion 11 of the microphone gel,
the direction perpendicular to the axial direction of the microphone portion C (up and down in
the mounted state) Not only can be moved in the direction), but also can be moved in the axial
direction of the microphone unit C (the depth direction of the ear canal 62 in the mounted state).
Furthermore, a pickup sensor 8 is built in the microphone unit C, and the pickup sensor 8 is
supported in a state where its main detection direction is inclined with respect to the axial
direction of the microphone unit C. As a result, not only voice vibration transmitted in the
direction perpendicular to the axial direction of the microphone unit C can be detected, but also
voice vibration transmitted in the axial direction can be detected.
[0049]
With such a configuration, the ear worn type sound information transmitter according to the
present invention is generated in the vocal cords, throat, tongue, lower teeth, etc., and is
transmitted mainly through the jaws, cheeks, etc. Not only the vibration of the upper teeth, the
nasal cavity, the soft palate, the hard palate, etc., but also the vibration (upper vibration) reaching
the concha cavity mainly through the skull and the like mainly Can. Therefore, the detection
accuracy of the bone conduction sound in the ear worn type sound information transmitter can
be enhanced. From these vibrations, it is possible to detect bone conduction voice with less
discomfort similar to air conduction sound. In particular, it is not possible to detect the upper
vibration, and in the case of mainly detecting the lower vibration, it is not possible to detect the
bone conduction sound in the high range, but both vibrations can be detected in this way. It is
possible to detect bone conduction sound from the low range to the high range.
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[0050]
As described above, according to the present invention, it is a compact, easy-to-use shape
suitable for the form of a bone conduction sound pickup, and can be used for ear attachment
which can detect bone conduction sound with less discomfort similar to air conduction sound. It
becomes possible to realize a type of sound information transmitter.
[0051]
In the above-described example, one pickup sensor 8 is used. However, the present invention is
not limited to this, and a plurality of pickup sensors 8 may be used.
In this case, one pickup sensor 8 is disposed so that its main detection direction is substantially
parallel to the microphone axis direction so that the vibration in the upper direction is mainly
detected, and the other pickup sensor 8 mainly performs the vibration in the lower direction. It is
preferable to arrange so that the main detection direction is substantially perpendicular to the
microphone axis direction so as to be detected.
[0052]
It is a perspective view which shows the external appearance of the ear-worn type sound
information transmitter concerning this invention. It is a longitudinal cross-sectional view which
shows the center part of the ear-worn type sound information transmitter concerning this
invention. It is a figure which shows the mounting state of the ear-worn type sound information
transmitter concerning this invention. It is a figure which shows the microphone part in the earwear type sound information transmitter concerning this invention. It is a figure which shows the
pick-up sensor in the ear-worn type sound information transmitter concerning this invention. It is
a circuit diagram showing the circuit composition of the pickup sensor in the ear wear type
sound information transfer device in the present invention. It is a perspective view which shows
the name of each part of the ear.
Explanation of sign
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[0053]
A signal processing circuit board storage section (board storage section), B earphone section, C
microphone section 1 signal processing circuit board, 2 output lines, 3 earphones, 4 sound
conduits, 5 back gel plate, 6 tip gel plate, 7 gel Receiving, 8 pickup sensor, 9 microphone
housing, 9a holding foot, 9b lower end, 9c lower end, 10 microphone gel upper, 11 microphone
gel lower, 12 microphone holder, 12a box body portion, 12b ridged portion, 13 housing, 14
input line, 15 sandwiching parts, 16 batteries, 17 operation buttons, 18 charging terminals
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18
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