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JP2001326985

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2001326985
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to
an apparatus for converting vibration into an electrical signal, and is particularly suitable for a
portable telephone receiver / transmitter by utilizing otobone vibration.
[0002]
2. Description of the Related Art Conventionally, a device for converting sound into a
corresponding electric signal has been based on a microhorn, but as shown in FIG. Since the
ambient sound, ie noise c, is put on the converting device together, the playback sound e coming
out of the speaker d conveys only the intended sound b with the sound of the word b and the
noise c coming together. Things were difficult.
[0003]
Therefore, in a conversation under noise, especially in the car, the original target sound, that is,
the human language b (hereinafter referred to as the target sound.
With the growing demand for only transmitting, bone-conduction microhorns have been
developed that use the otobone vibration to convert the vibration into an electrical signal. The
otobone vibration is a vibration of the vocal cords occurring at the time of vocalization vibrating
the skull and the cartilage around the wall of the ear canal, which is the otobone vibration. The
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bone conduction micro horn is hereinafter referred to as an ear microphone for converting this
otobone vibration into broad speech information.
[0004]
FIG. 11 shows the transmission of only the target sound due to the otobone vibration. In FIG. 11,
d is a speaker, f is an ear, g is an external auditory canal, h is an otobone vibration caused by
vocalization, i is the above-mentioned ear microphone, j is an ambient sound, k is an electrical
signal, and l is a speaker d It is a playback sound. Then, the otobone vibration h generated by the
utterance is transmitted to the ear microphone i inserted into the ear canal g, and the otobone
vibration h is converted into an electric signal k and transmitted to the speaker d in the same ear
microphone i. In the speaker d, the electric signal k is converted to vibration, and becomes a
reproduced sound l and oscillated from the speaker d. In this case, since the ambient sound j
around the ear f is blocked and only the otobone vibration h is transmitted by the electric signal
k, the reproduction sound l oscillated from the speaker d is only the target sound.
[0005]
Conventional ear microphones i are commercially available, but all transducers are acceleration
type pickups in which a piezoelectric ceramic is processed into a bimorph / unimorph type. In
general, a piezo ceramic represented by PZT (lead zirconate titanate) is most frequently used as a
piezoelectric material. On the other hand, devices that reproduce electrical signals corresponding
to a target sound into sound include those using a speaker, but the sound flowing from the
speaker (hereinafter referred to as reproduction target sound). ) Is transmitted along with the
ambient sound or noise to the listener's ear, so the reproduction target sound was often heard
and heard. In particular, in conversations in noisy interiors of cars, the reproduction target
sound, that is, the words of the other party are often heard and it causes trouble. In such a case,
there is an increasing demand for listening to only the reproduction target sound, and an
earphone or a headphone (hereinafter referred to as a headphone) is represented as the device. )
Is used.
[0006]
And, in the earphones, only the sound coming into the speaker will be heard, but since the
surrounding sound and noise will be included in the sound coming into this speaker, it will be
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important to hear only the reproduction target sound. I could not do it. That is, there is a problem
that the surrounding sound enters together in the micro horn, the surrounding sound comes
together in the speaker, and the ear phone can only hear the sound transmitted from the other
party. Therefore, in recent years, an earphone integrated ear microphone has been developed in
which an earphone and an ear microphone are integrated using otobone vibration.
[0007]
FIGS. 12 and 13 show a conventional earphone and ear microphone integrated with a
piezoelectric ceramic (PZT) made of lead zirconate titanate as a material having a piezoelectric
effect (piezoelectric element), that is, an earphone integrated ear microphone It is a sectional
view of In FIG. 12 and FIG. 13, m is a rubber intubated tube contacting an ear canal not shown, n
is a rigid inner cylindrical frame, o is a piezoelectric ceramic, p is a piezoelectric ceramic support
plate, and q is a piezoelectric ceramic support plate A support for p, r is an ear shell holder into
which the intubation tube m is inserted and held in the ear to an appropriate position, and a
speaker s is built in the ear shell holder r. t is a sound passage which transmits the sound emitted
from the speaker s, and u is a two-core shielded cable. Then, the inner cylindrical frame n is
inserted into the intubation tube m, and one end is opened in the auricle holder r. A piezoelectric
ceramic support plate p and a piezoelectric ceramic o supported on a support q are housed in the
inner cylindrical frame n.
[0008]
Ear bone vibration from the ear (not shown) is transmitted from the intubation tube m to the
inner cylinder frame n, and the inner cylinder frame n is deformed and vibrated corresponding to
the ear bone vibration. This deformation / vibration is transmitted to the piezoelectric ceramic o
via the support base q and the piezoelectric ceramic support plate p, converted into an electric
signal, and transmitted to a speaker (not shown) via the two-core shielded cable u. On the other
hand, the electrical signal transmitted through the two-core shielded cable u is converted into
sound by the speaker s, and transmitted to the ear (not shown) via the sound passage t.
[0009]
However, in the earphone integrated ear microphone shown in FIGS. 12 and 13, generally, piezoceramics (PZT) are most frequently used as a piezoelectric material. However, this piezo-ceramic
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(PZT) is poor in flexibility and brittle, has poor machinability, and can not be used in any size and
shape, and has poor sound quality due to its cantilever beam. Furthermore, in the earphone
integrated ear microphone, as shown in FIG. 14, when the earphone and the ear microphone are
integrated, the reproduction target sound emitted from the earphone enters the micro horn and
is amplified again, and when this is repeated, the sound is distorted. Come out. When going
further, annoying noise was generated by howling with pee, poo, boo, and so on.
[0010]
SUMMARY OF THE INVENTION The present invention solves the above problems and integrates
a vibration transmission device for converting a target sound into a good electric signal, and a
mechanism for obtaining the good reproduction target sound with the vibration transmission
device. The present invention provides an earphone integrated ear microphone that is suitable
for the hand-free operation. A first invention of the present invention is a device for converting
vibration into an electrical signal using a piezoelectric element, wherein the piezoelectric element
is a vibration transmitting device using a piezoelectric film. A second invention of the present
invention is an apparatus for converting vibration into an electrical signal using a piezoelectric
element, wherein the piezoelectric element is a thin plate of piezoelectric film which is spirally
wound as the piezoelectric element. A third invention of the present invention is a device for
converting otobone vibration into an electrical signal using a piezoelectric element, wherein the
vibration transmitting device uses a piezoelectric film as the piezoelectric element. A fourth
invention of the present invention is a device for converting otobone vibration into an electrical
signal using a piezoelectric element, wherein the piezoelectric thin film is used as the
piezoelectric element and the piezoelectric thin film is spirally wound.
[0011]
According to a fifth aspect of the present invention, there is provided a cylinder having a
soundproofing path having a sound passage having an opening at one end and a speaker for
converting an electric signal to a sound wave at the other end, and helically wound around the
outer periphery of the cylinder An extremely thin plate piezoelectric film cylinder for converting
the transmitted ocular bone vibration into an electric signal, and an inner periphery thereof is in
contact with the outer peripheral surface of the piezoelectric film cylinder and an outer periphery
is in contact with the otic bone It is a vibration transmission device in which an ear bone
vibration transmission cylinder made of a material with high transmission efficiency and a
transistor amplifier for amplifying an electric signal from the piezoelectric film cylinder are
integrally configured.
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[0012]
DETAILED DESCRIPTION OF THE INVENTION The inventor obtained the following findings
through repeated experiments.
A piezoelectric film [PVDF] in which polyvinylidene fluoride is coated on a polyethylene film is
used as a piezoelectric element for converting vibration into an electrical signal. This piezo film
combines the excellent flexibility, processability, impact resistance, high voltage resistance, water
resistance, chemical stability, etc. of polymers with large area, arbitrary size, shape and thickness
reduction. It is easy to do. In addition, piezo films have features such as high voltage output, wide
frequency characteristics, low acoustic impedance, and large piezoelectric constants.
Furthermore, since the piezo film has a low acoustic impedance close to that of the human body,
it is extremely effective as a sensor element of the otobone vibration pickup. Furthermore, since
the piezoelectric film is thin and flexible, it can be spirally wound to form a cylindrical
piezoelectric film cylinder. Therefore, if this piezoelectric film cylinder is used, it is deformed as
shown in FIG. 15 due to the otobone vibration, thereby causing expansion and contraction of the
piezo film and generating a potential due to the piezoelectric effect, so that the otobone vibration
is efficiently converted into an electric signal. You can do it.
[0013]
Next, an embodiment of the present invention will be described in detail. DESCRIPTION OF THE
PREFERRED EMBODIMENT FIG. 1 is an explanatory view of an embodiment of the first invention
of the present invention. In FIG. 1, 1 is a sound wave, 2 is a piezoelectric film made of a piezo
film, 3 is a fixed electrode, and 4 is a power supply. FIG. 2 is an explanatory view of a second
embodiment of the present invention. In FIG. 2, 1a is a sound wave, 2a is a spirally wound
piezoelectric film tube made of a piezo film, 3a is a fixed electrode, and 4a is a power source. The
electric signal obtained in the embodiment shown in FIGS. 1 and 2 is used as a sound source for
amplification, recording, broadcasting, measurement of acoustics, medical and the like.
[0014]
FIG. 3 is a side view of the third embodiment of the present invention. In FIG. 3, 2b is a
piezoelectric film made of a piezo file, 5b is an ear bone vibration transmission cylinder made of
a silicon material close to water, and this ear bone vibration transmission cylinder 5b is inserted
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into the human ear and its outer peripheral surface is the ear bone Contact with 6b is a speaker
built in the auricle holder 7b, 8b is a sound passage for transmitting the sound wave from the
speaker 6d to the ear not shown, 9b is a FET transistor amplifier, and 10b is a two-core shielded
cable. FIG. 4 is a side view of the fourth embodiment of the present invention. In FIG. 4, 2c is a
spirally wound piezoelectric film cylinder made of a piezoelectric film, 5c is an ocular bone
vibration transmitting cylinder made of a silicon material close to water, and this otobone
vibration transmitting cylinder 5c is for the human ear It is inserted and the outer peripheral
surface comes in contact with the otic bone. 6c is a speaker built in the ear shell holder 7c, 8c is
a sound passage for transmitting the sound wave from the speaker 6c to the ear not shown, 9c is
a FET transistor amplifier, and 10c is a two-core shielded cable.
[0015]
In the embodiment illustrated in FIGS. 3 and 4, the otobone vibration is transmitted from the
outer peripheral surface of the otobone vibration transmitting cylinders 5b and 5c, and the
otobone vibration transmitted to the piezoelectric film 2b and the piezoelectric film cylinder 2c is
an electrical signal. This electrical signal is amplified by the FET transistor amplifiers 9b and 9c
and transmitted by the two-core shielded cables 10b and 10c to be used as sound sources for
loud-speaking, recording, broadcasting, acoustic measurement, medical, etc. Do. On the other
hand, the electric signal transmitted from the other side through the two-core shielded cable 10b,
10c is reproduced to voice by the speakers 6b, 6c, and the voice passes through the sound
passing paths 8b, 8c to the unillustrated ears. Reportedly.
[0016]
5 to 7 show an embodiment of the fifth invention of the present invention, and FIG. 5 is a side
sectional view, FIG. 6 is a sectional view taken along the line VI-VI of FIG. 5, and FIG. FIG. In FIG.
5 to FIG. 7, 2d is a piezoelectric film cylinder in which a piezo film is spirally wound, 5d is an ear
bone vibration transmission cylinder made of a silicon material close to water, and this ear bone
vibration transmission cylinder 5d is a human ear The outer peripheral surface is inserted into
the umbilical cord so as to contact with the unillustrated otla. 6d is a speaker built in the ear shell
holder 7d, and 8d is a sound passage opened at one end to the eardrum side (not shown) and at
the other end to the speaker 6d side for converting an electric signal into a sound wave. 9d is a
FET transistor amplifier, and 10d is a two-core shielded cable. A first vibration-proof cylinder 11d
is made of metal (tungsten), plastic and is made of metal (tungsten) and plastic, and is generated
from the speaker 6d. It blocks the transmission of passing sound to the piezoelectric film cylinder
2d. Therefore, this portion may be hollow and in a vacuum state. The second vibration-proof
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cylinder 12d is made of a vibration-proof type rubber or a polystyrene foam provided between
the piezoelectric film cylinder 2d and the first vibration-proof cylinder 11d, and has several
layers of different acoustic impedances. You should make it.
[0017]
Next, the operation of this embodiment will be described. In FIGS. 5 to 7, the otobone vibration,
that is, the target sound is converted into an electric signal by the piezoelectric film cylinder 2d
through the otobone vibration transmitting cylinder 5d, and this electric signal is amplified by
the FET transistor amplifier 9d and the two core shielded cable 10d. Is communicated to the
other party via In this case, the sound passing through the sound passage 8d is blocked by the
first vibration damping cylinder 11d and several layers of the second vibration damping cylinder
12d, and noise from the outside is blocked and only the otobone vibration is transmitted. , Only
the target sound is transmitted as an electrical signal to the communicating party. On the other
hand, the electric signal transmitted from the other party of communication through the two-core
shielded cable 10d is reproduced by the speaker 6d and transmitted to the eardrum through the
sound passage 8d. In this case, the external sound is cut off, and the sound transmitted by the
otobone vibration is also cut off by the first vibration proof cylinder 11d and several layers of the
second vibration proof cylinder 12d. Is transmitted to the tympanic membrane.
[0018]
EXPERIMENTAL EXAMPLES FIGS. 8 and 9 show one example of the results of experiments based
on the examples shown in FIGS. 5 to 7 in order to clarify the effects of the present invention. The
speech of the experiment is an example of an experiment where the vowels of "A", "I", "U", "E" and
"O" are uttered. FIG. 8 shows an example using a conventional micro horn, where the left side in
FIG. 8 is the measurement result in the “quiet place” and the right side in FIG. 8 is the
measurement result in “under noise”. In “under noise”, the target sound shown on the left
side in FIG. 8 is a waveform in which the waveform of the noise is superimposed as shown on the
right side in FIG. That is, it is an unclear voice.
[0019]
FIG. 9 shows measurement results of comparative experiments using the embodiment of the
present invention shown in FIG. 5 to FIG. The left side of FIG. 9 is the measurement result
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obtained by picking up the otobone vibration in the “quiet place”, and the right side of FIG. 9 is
the measurement obtained by picking up the otobone vibration in “under noise” It is a result.
The sound waveform obtained by picking up the otobone vibration in the "quiet place" is a sound
waveform that is hardly affected even under "noise". That is, it can be seen that, by using the
earphone integrated ear microphone shown in the present embodiment, an audio waveform
almost the same as an audio waveform in a "quiet place" can be obtained even in "under noise".
[0020]
As described above, according to the present invention, the following excellent effects can be
obtained. Since a piezoelectric film made of a piezo film is used, good sound quality can be
obtained. Since a flexible piezoelectric film is spirally wound to use several layers of the
piezoelectric film cylinder, better sound quality can be obtained. Only the otobone vibration is
converted into an electrical signal, and the noise is cut off, so only the target sound is transmitted
to the other party and the communication becomes good. In addition, since the sound of the
speaker transmitted from the other party intercepts the otobone vibration, only the reproduction
target sound is transmitted to the tympanic membrane, and the communication becomes even
better. Since the earphone and the microhorn can be integrated, and only the target sound is
transmitted and only the reproduction target sound is transmitted, a very effective receiver /
transmitter can be obtained as a communication instrument in a car with high noise.
[0021]
Since the displacement type pickup is configured using a piezoelectric film (PVDF) as a
piezoelectric material, it enables manufacturing of an ear microphone with high sensitivity but no
cord noise, and low mechanical impedance which is a major feature of the piezoelectric film. By
using the sensor, it is possible to structurally eliminate the vibration from the earphone, prevent
howling, etc., and also to separate the voice information of the person and the person around, by
the hardware means of the above problem. I can solve it. The combination of the excellent
flexibility, processability, impact resistance, water resistance, chemical stability, etc. of the
piezoelectric film makes it easy to process and makes the transducer section cylindrical to make
contact with the ear canal It is made of silicon, which enhances adhesion and makes it easy to
receive pressure on PVDF all around. Therefore, the circle is deformed in response to the
vibration displacement of the ear canal, and the piezo film is expanded and contracted to
generate the piezoelectric effect. It is possible to provide a small size, light weight, and
inexpensive at a good balance with the earphone.
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[0022]
Since a flexible piezoelectric film is spirally wound to use several layers of the piezoelectric film
cylinder, better sound quality can be obtained. It is possible to provide an earphone integrated
ear microphone suitable for hands-free operation. {Circle over (10)} Therefore, very good
communication can be performed even under noise with small mobile communication devices
that have been rapidly spread in recent years.
[0023]
Brief description of the drawings
[0024]
FIG. 1 is an explanatory view of a first embodiment of the present invention.
[0025]
FIG. 2 is an explanatory view of an embodiment of the second invention of the present invention.
[0026]
FIG. 3 is a side cross-sectional view of the third embodiment of the present invention.
[0027]
FIG. 4 is a side cross-sectional view of an embodiment of the fourth invention of the present
invention.
[0028]
FIG. 5 is a side sectional view of an embodiment of the fifth invention of the present invention.
[0029]
6 relates to an embodiment of the fifth invention of the present invention, and is a sectional view
taken along the line VI-VI in FIG.
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[0030]
7 relates to an embodiment of the fifth invention of the present invention, and is a sectional view
taken along the arrow of FIG.
[0031]
FIG. 8 is a graph showing an audio waveform obtained by the conventional micro horn.
[0032]
FIG. 9 is a graph showing an audio waveform obtained using the earphone integrated ear
microphone of the embodiment of the present invention.
[0033]
10 is an explanatory view showing the influence of ambient sound in the micro horn.
[0034]
FIG. 11 is an explanatory view showing the influence of ambient sound due to otobone vibration.
[0035]
FIG. 12 is a side sectional view of a conventional ear micro horn.
[0036]
13 is a cross-sectional view taken along the line XIII-XIII in FIG. 12 as it relates to the
conventional ear micro horn.
[0037]
FIG. 14 is an explanatory diagram of howling.
[0038]
FIG. 15 is an explanatory view of otobone vibration.
[0039]
Explanation of sign
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[0040]
DESCRIPTION OF SYMBOLS 1 ... Sound wave 2 ... Piezoelectric film 2a ... Piezoelectric film
cylinder 3 ... Fixed electrode 4 ... Power supply 5b ... Earbone vibration transmission cylinder 6b
... Speaker 7b ... Earshell holding Body 8b: sound passing path 9b: FET transistor amplifier 10b:
two-core shielded cable 11d: first vibration proof cylinder 12d: second vibration proof cylinder
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