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JP2002045790

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DESCRIPTION JP2002045790
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
vibration transmission device for converting an input electric signal into mechanical vibration,
and in particular to efficiently transmit the vibration to a visco-elastic body, and the vibration
transmission device. The present invention relates to a portable communication device
configured using.
[0002]
2. Description of the Related Art Transmitting vibration to a visco-elastic body having a relatively
high degree of development of a viscous property results in an elastic body or visco-elasticity
having a relatively high degree of development of a relatively elastic property. It is more difficult
than transmitting vibration to the body. In addition, it is very difficult to transmit vibration to a
visco-elastic body in which the degree of development of viscosity and elasticity is not uniform
depending on the site as compared to giving vibration to a visco-elastic body that uniformly
develops viscosity and elasticity.
[0003]
The human body is a visco-elastic body whose viscosity and elasticity are not uniform. There
have been many inventions of means and devices for transmitting vibrations to the human body.
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Such devices have been put to practical use in various applications, but one of the applications is
to directly transmit an audio signal or the like to a living tissue.
[0004]
Vibration transmission devices for transmitting voice signals directly to living tissue are also
called bone conduction vibration transmission devices, and it is difficult for an environment
where it is difficult to hear the sound due to air propagation in noise etc., the eardrum, etc. It is
used in hearing aids for people with severe hearing loss. There is a vibration transmission device
used by being attached to a helmet of a coal miner, for example, for use in noise, but even a small
one has a contact surface with a living body of 5 cm or more. Many vibration transmission
devices used for hearing aids and the like use a piezoelectric element and are relatively compact.
[0005]
A vibration transmission device disclosed in Japanese Patent Application Laid-Open No. 11027921 is one of the vibration transmission devices characterized by a configuration including a
coil and a magnet without using a piezoelectric element. Moreover, the mounting | wearing type |
mold communication apparatus using bone conduction is disclosed by Unexamined-JapanesePatent No. 2000-049935.
[0006]
The above-mentioned wearable communication device arranges a vibration transmission device
on the operator's wrist, hand, finger or toe, and inserts the operator's finger into the ear canal or
presses the finger near the ear Alternatively, the transmission / reception operation is performed
in a state where the operator's finger is pressed against the ear so as to close the ear canal with
the fingertip or nail. In order to construct the above-mentioned wearable communication device,
an optimum vibration transmission device is required.
[0007]
A vibration transmission device used by being worn on a helmet or the like of a coal miner has a
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problem that its shape is too large in order to constitute a wearable communication device such
as a portable telephone. In addition, the vibration transfer device using the piezoelectric element
has a characteristic that the frequency range in which there is no problem in practical use is
narrower than the vibration transfer device configured using the coil and the magnet.
[0008]
The vibration transmission device disclosed in Japanese Patent Application Laid-Open No. 11027921 exhibits excellent operation when mounted on the back of a finger or hand. This is
because the backs of the fingers and hands are relatively close to the surface of the living body.
Since skin and subcutaneous tissue exhibit a more viscous property than bone, it is a bone more
like an elastic body that mediates the transmission of vibration through living tissue.
[0009]
Since the surface of the wrist on the palm side is relatively away from the surface of the living
body, in order to efficiently transmit the vibration to the bone, the living body at the contact
surface between the transducer of the vibration transmitting device and the living body is It is
necessary to bring the contact surface between the vibrator and the living body close to the bone
by applying pressure in the direction from the surface to the inside of the living body.
[0010]
In the vibration transfer device disclosed in Japanese Patent Application Laid-Open No. 11027921, it is difficult to effectively apply the above pressure.
In addition, also in the case of transmitting vibrations through not only bone but also tendon, it is
effective to apply the pressure.
[0011]
Accordingly, the technical problem of the present invention is to further improve the
performance of the above-mentioned conventional vibration device, to be usable in a small size
and wide frequency band, and to have a characteristic like a living body. It is an object of the
present invention to provide a vibration transmission device capable of effectively vibrating even
a visco-elastic body which is not uniform.
03-05-2019
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[0012]
SUMMARY OF THE INVENTION The present invention is made as a result of fundamentally
revising the structure of a conventional vibration transmission device in order to achieve the
above object.
[0013]
That is, according to the present invention, a coil support having a coil positioning portion
formed on its periphery, a flexible damper coaxially arranged and fixed with respect to the coil
support, and a central portion of the damper are fitted. And a magnetic circuit including a
permanent magnet mounted on the central shaft via the air gap between the damper and the coil,
and a coil disposed in the air gap and fixed to the coil positioning portion of the coil support. A
vibration transmission device comprising: a vibration actuator configured to coaxially arrange the
magnetic circuit with respect to the coil and supported in an operable state; and a shell cover The
above-mentioned coil support stand is arranged and fixed inside the above-mentioned shell
cover.
[0014]
Further, in the vibration transmission apparatus according to the present invention, the damper
may have a plane in which the damper is fitted to the central axis and a plane disposed and fixed
on the coil support base in parallel. It is a three-dimensional structure which does not comprise
the same plane, It is a vibration transfer apparatus characterized by the above-mentioned.
[0015]
Further, according to the present invention, there is provided a portable type characterized in
that any one or both of the above-mentioned vibration transmission devices are used as either or
both of an audio output device and a vibration output device. It is a communication device.
[0016]
According to the present invention, vibration can be efficiently transmitted even to a viscoelastic
body which is not uniform in characteristics like a living tissue.
Further, by adopting the above-described configuration and arrangement of the dampers, it is
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possible to increase the applied pressure and improve the vibration transmission efficiency to the
visco-elastic body, as compared with the case where the planar structure damper is used.
[0017]
Further, by constructing a wearable portable bond device using the above-mentioned vibration
transmission device, it is possible to mount the reception performance better than that of a
wearable portable communication device constructed using the conventional vibration
transmission device. Type portable communication devices can be obtained.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION A concrete example of the embodiment of the
present invention will be described below based on the drawings.
[0019]
FIG. 1 is a sectional view of an embodiment of a vibration transmission device according to the
present invention.
The vibration transmission device shown in this figure has a coil support 11, a damper 12, a
central axis 13, a spacer 14, a magnet 15, a plate 16, a yoke 17, a coil 18, and a shell cover 19.
[0020]
As shown in FIG. 1, the magnet 15, the plate 16 and the yoke 17 are integrated to form a
magnetic circuit, and are mounted on the central shaft 13 together with the damper 12.
An air gap is formed between the damper 12 and the plate 16 by the spacer 14 so as not to
disturb the magnetic circuit in the vertical direction of FIG.
[0021]
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Also, a portion of the coil support 11 on which the coil is fitted, that is, the coil 18 is disposed in
the air gap provided between the yoke 17 which is a part of the magnetic circuit and the damper
12. It is attached to the positioning unit.
The coil support 11 supports the damper 12 and is attached to the shell cover 19.
By adopting such a structure, when current flows through the coil 18, the generated magnetic
force causes the magnetic circuit supported by the flexible damper 12 to vibrate.
[0022]
FIG. 2 is a view showing an example of use of the vibration transfer device shown in FIG.
The vibrator portion of the vibration transfer device 21 is fixed to the visco-elastic body 22 by
the fixing band 23, and the vibration is transmitted from the vibration transfer device 21 to the
visco-elastic body 23.
[0023]
As the shape of the shell cover 19, as shown in FIG. 1 and FIG. 2, for example, a disc-like shape
provided with an edge on the outer periphery is conceivable, but it may be a shape such as a
polygon instead of a disc. The edge may be sloped, and various shapes are conceivable.
[0024]
FIG. 3 shows the vibration transmitting apparatus according to the present invention, in which
the plane in which the damper is fitted to the central axis and the plane on which the damper is
disposed and fixed to the coil support are parallel and coplanar. It is a figure which shows the
example which is three-dimensional structure which does not comprise.
The configuration of the vibration transmission device of this example is basically the same as
that shown in FIG. 1, but the method of mounting the damper is different as described above.
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[0025]
The structure of the present vibration transmission device will be described below with reference
to FIG.
The vibration transmission device mainly includes a coil support 31, a damper 32, a central axis
33, a spacer 34, a magnet 35, a plate 36, a yoke 37, a coil 38, and a shell cover 309. The magnet
35, the plate 36 and the yoke 37 constitute a magnetic circuit, and the coil 38 is disposed at the
coil positioning portion of the coil support 31.
[0026]
When an electric current flows through the coil 38, a magnetic force is generated, and the
magnetic circuit supported by the flexible damper 32 vibrates. The coil support 31 has a coil
positioning portion, supports the damper 32, and is attached to the shell cover 39.
[0027]
Since the damper 32 has the above-described three-dimensional structure, when the vibration
transmission device is pressed against the visco-elastic body, a large pressure is applied to the
contact surface between the damper and the living body. By this, it is possible to efficiently
transmit the vibration even to the visco-elastic body whose characteristics are not uniform.
[0028]
FIG. 4 is a view showing an example in which the vibration transmission device of the present
invention is applied to a portable communication device. The portable communication device is
composed of a headphone-type speech receiving device 41 and a portable communication device
43, and a vibration transmission device 42 is attached to a portion in contact with the ear. The
vibration transfer device 42 has the configuration shown in FIG. 1 or 3.
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[0029]
As a result, the output from the portable communication device 43 is directly transmitted to the
bone tissue of the user, so the surrounding noise is large and the sound is difficult to hear, or
when a deaf person with a disorder of the eardrum uses it. However, good communication is
possible. Besides, it is of course possible to attach the device to the wrist and use a finger in the
vicinity of the ear.
[0030]
Further, the portable communication device using the vibration transmission device of the
present invention can vibrate not only by the vibration output of the voice frequency band, but
also by the appropriate vibration of 300 Hz or less, which can be felt by humans by touch. Can
also be output. Therefore, the portable communication device of the present invention can be
used as a vibration calling device not only by outputting a voice signal but also by outputting a
vibration that human beings can sense by touch.
[0031]
As described above, according to the present invention, vibration can be efficiently transmitted to
the visco-elastic body. Since vibration is obtained by the magnet and the coil without using a
piezoelectric element as a vibrator, when transmitting vibration in an audio frequency band,
effective vibration is transmitted in a wider frequency band than a vibration transfer device using
a piezoelectric element. Can.
[0032]
In addition, the structure using a magnetic circuit including a magnet as a direct vibrator can
realize a small size vibration transmission device compared to a conventional vibration
transmission device using a magnet and a coil, and by using it for a portable communication
device Even when used in a noisy place or when used by a deaf person, effective transmission
and reception communication is possible.
[0033]
Also, in particular, the visco-elastic properties are relatively nonuniform, such as a visco-elastic
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body having a relatively high viscosity surrounding the visco-elastic body having a relatively
high-elastic property, as in the case of a living tissue. When the body is vibrated, a suitable
pressure can be applied between the vibration transmission surface and the living body, so that a
larger vibration can be transmitted as compared with the conventional vibration transmission
device.
[0034]
Brief description of the drawings
[0035]
1 is a diagram showing an example in which the damper is a flat plate structure in the
embodiment of the present invention.
[0036]
2 is a view showing an attached state of the vibration transmission device shown in FIG.
[0037]
3 is a diagram showing an example in which the damper has a three-dimensional structure
according to the embodiment of the present invention.
[0038]
4 is a diagram showing an example in which the vibration transmission device of the present
invention is used in a portable communication device.
[0039]
Explanation of sign
[0040]
11, 31 coil support 12, 32 damper 13, 33 central shaft 14, 34 spacer 15, 35 magnet 16, 36 plate
17, 37 yoke 18, 38 coil 19, 39 shell cover 21 vibration transmission device 22 visco-elastic body
23 fixed Band 41 Headphone type receiver 42 Vibration transmission device 43 Portable
communication device
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