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JP2004057261

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DESCRIPTION JP2004057261
An object of the present invention is to provide a bone conduction speaker built-in pillow in
which only a person using a pillow can listen to music and the like and music and the like can not
be heard by the surrounding people. A pillow main body 12 of a bone conduction speaker built-in
pillow 10 is integrally formed of urethane 14 in a substantially inverted heart shape in plan view.
A hollow portion 16 having a substantially inverted heart shape in plan view is formed at the
center of the pillow body 12 along the front-rear direction of the pillow body 12. Bone
conduction speaker accommodation holes 18, 18 are formed in a slightly inclined state in the
inclined portions 17, 17 formed on both sides of the hollow portion 16 of the pillow body 12.
The bone conduction speakers 20, 20 formed by using super magnetostrictive actuators are
accommodated in the bone conduction speaker accommodation holes 18, 18, respectively.
[Selected figure] Figure 1
Bone conduction speaker built-in pillow
TECHNICAL FIELD [0001] The present invention relates to a bone conduction speaker built-in
pillow capable of hearing a sound such as music as a bone conduction sound. 2. Description of
the Related Art There are many cases where it is possible to relax even more when listening to
music etc. while sleeping, so it is preferable to have a speaker etc. of the sound device built in the
pillow and enjoy music etc while sleeping. Pillows that can be used have been proposed.
However, the speakers and the like of the sound device built in this type of pillow are due to air
conduction which allows the eardrum to be vibrated and heard by sounds such as music
vibrating air. For this reason, in the pillow of the type described above, the music etc. flowing
from the speaker of the sound device is not only the person who is going to listen to music but
also the people around them through the air, causing trouble to the people around them. There is
a problem that SUMMARY OF THE INVENTION The present invention has been made in view of
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the above-mentioned facts, and only the person using the pillow can listen to the music etc. It
provides a bone conduction speaker built-in pillow which can not be heard. SUMMARY OF THE
INVENTION According to the invention of claim 1, a pillow body for holding a head, a bone
conduction speaker housing hole formed in the pillow body, and a bone conduction speaker
housing hole are housed. And a bone conduction speaker formed by using the giant
magnetostrictive actuator. The invention according to claim 2 is formed by using a pillow body
for holding the head, a bone conduction speaker housing hole formed in the pillow body, and the
bone conduction speaker housing hole and utilizing a super magnetostrictive actuator. Bone
conduction speaker, a super magnetostrictive rod formed of an alloy which is disposed at the
center of the casing of the bone conduction speaker and has the property of expanding and
contracting due to the change of the magnetic field, and A magnetic field generating
electromagnetic coil to which an audio signal is supplied, a bias magnetic field generating magnet
disposed on the outer periphery of the magnetic field generating electromagnetic coil and
applying a bias magnetic field to the giant magnetostrictive rod, and an end of the giant
magnetostrictive rod A free end which is formed and expanded and contracted by a magnetic
field change generated by the magnetic field generating electromagnetic coil, and is fixed to the
free end via a movable rod and the pillow Is characterized in that the head which carries the
body is has a vibrating pad for contact, the. The invention according to claim 3 includes a pillow
body for holding the head, a recess formed in the center of the pillow body along the front-rear
direction, and slopes formed on both sides of the recess. A bone conduction speaker housing hole
formed in the inclined portion, a bone conduction speaker housed in the bone conduction
speaker housing hole and formed using a super magnetostrictive actuator, and disposed at the
center of the bone conduction speaker casing Giant magnetostrictive rod made of an alloy having
the property of expanding and contracting due to the change of the magnetic field, a magnetic
field generating electromagnetic coil disposed around the giant magnetostrictive rod and
supplied with an audio signal, and the magnetic field generating electromagnetic A bias magnetic
field generating magnet disposed on the outer periphery of a coil and applying a bias magnetic
field to the giant magnetostrictive rod, and formed at an end of the giant magnetostrictive rod,
the magnetic field generating electromagnetic coil And a vibrating pad which is fixed to the free
end via a movable rod and a head placed on the pillow body abuts, and one end is connected to
the bone conduction speaker A first cord, an amplifier connected to the other end of the first
cord and connected to the acoustic device via the second cord, and an adapter connected to the
amplifier It is characterized.
DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a bone conduction speaker
built-in pillow according to the present invention is shown in FIGS. As shown in FIG. 2, the pillow
main body 12 of the bone conduction speaker built-in pillow 10 is integrally formed of urethane
14 in a substantially inverted heart shape in plan view. The lower side of the pillow body 12 in
FIG. 2 is formed with a circular arc portion 12A so as to correspond to the shape of the shoulder
of the pillow user. As shown in FIGS. 2 to 4, a depression 16 having a substantially inverted heart
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shape in plan view is formed in the center of the pillow body 12 along the front-rear direction of
the pillow body 12, as shown in FIG. The head and neck of the pillow user can be stably
supported. As shown in FIG. 5, bone conduction speaker accommodation holes 18, 18 are formed
in a slightly inclined state in the inclined portions 17, 17 formed on both sides of the hollow
portion 16 of the pillow body 12. As shown in FIG. The bone conduction speakers 20, 20 formed
by using super magnetostrictive actuators are accommodated in the bone conduction speaker
accommodation holes 18, 18, respectively. In addition, since the structure of these two bone
conduction speakers 20 and 20 is the same, below, one bone conduction speaker 20 is
demonstrated. The bone conduction speaker 20 is shown in FIG. 6 in a longitudinal sectional
view. A giant magnetostrictive rod 24 is disposed at the center of the casing 22 of the bone
conduction speaker 20. The giant magnetostrictive rod 24 is formed of a special alloy (known
giant magnetostrictive material) having the property of expanding and contracting due to the
change of the magnetic field, so that current energy can be efficiently converted into mechanical
energy. A magnetic field generating electromagnetic coil 26 for forming a magnetic field
corresponding to the audio current in the axial direction of the giant magnetostrictive rod 24 is
provided on the outer periphery of the giant magnetostrictive rod 24. Further, a bias magnetic
field generating magnet 28 for applying a bias magnetic field to the giant magnetostrictive rod
24 is provided on the outer periphery of the magnetic field generating electromagnetic coil 26.
One end of the giant magnetostrictive rod 24 is a non-movable fixed end 24 A and is fixed to the
bottom 22 A of the casing 22. Further, the other end of the giant magnetostrictive rod 24 is a
free end 24 B which is expanded and contracted in the axial direction of the giant
magnetostrictive rod 24 by the change of the magnetic field generated by the magnetic field
generating electromagnetic coil 26. A leaf spring 30 is provided on the outside of the free end 24
B to apply a prestress in the compression direction of the giant magnetostrictive rod 24. A
movable rod 32 is connected to the free end 24 B of the giant magnetostrictive rod 24, and a
vibration pad 34 is fixed to the tip of the movable rod 32.
The upper end surface 34A of the vibration pad 34 is formed in an arc shape in cross section.
Further, as shown in FIG. 5, the vibration pad 34 is disposed so as to slightly protrude from the
inclined portion 17 of the pillow body 12. Therefore, as shown in FIG. 1, when the pillow user
places the head and neck on the pillow body 12 of the bone conduction speaker built-in pillow
10, the upper end surface 34A of the vibration pad 34 abuts on the occipital region. There is. As
shown in FIG. 6, a current terminal 36 is formed at the bottom 22A of the casing 22, and one end
40A of the first cord 40 is connected to the current terminal 36. As shown in FIG. 1, the plugs 42,
42 provided at the other end of the first cord 40 are connected to a dedicated amplifier 44. A
plug 48 provided at one end of the second cord 46 is inserted into the dedicated amplifier 44,
and the plug 50 provided at the other end of the second cord 46 is connected to a CD player 52
as an audio device. . Therefore, the dedicated amplifier 44 and the CD player 52 are connected
via the second cord 46. Further, the plug 56 of the dedicated AC adapter 54 is inserted into the
dedicated amplifier 44, whereby the dedicated amplifier 44 and the dedicated AC adapter 54 are
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connected. Next, the operation of the bone conduction speaker built-in pillow 10 of the
embodiment will be described. When it is desired to listen to music using the bone conduction
speaker built-in pillow 10, the plugs 42, 42 provided at the other end of the first cord 40
connected to the pillow body 12 are inserted into the dedicated amplifier 44. Then, the plug 48
of the second cord 46 is inserted into the dedicated amplifier 44, and the plug 50 of the second
cord 46 is inserted into the earphone jack or the output terminal of the CD player 52. Further,
the plug 56 of the dedicated AC adapter 54 is connected to the dedicated amplifier 44, and the
dedicated AC adapter 54 is inserted into the outlet to operate the dedicated amplifier 44. Then,
the CD player 52 is turned on with the volume of the CD player 52 minimized. Then, when the
pillow user places the head and cervical spine on the pillow body 12, the head and cervical spine
are stably supported in a state of fitting to the recess 16 and the upper end surface 34 A of the
vibration pad 34 of the bone conduction speaker 20 is Hit the back of the head. The audio signal
of the CD player 52 is supplied as an audio current to the magnetic field generating
electromagnetic coil 26 of the bone conduction speaker 20. Thereby, the strength of the
magnetic field formed in the axial direction of the giant magnetostrictive rod 24 changes in
accordance with the audio current, and the giant magnetostrictive rod 24 expands and contracts
in the axial direction.
Therefore, the vibration pad 34 vibrates via the movable rod 32 connected to the free end 24A of
the giant magnetostrictive rod 24 for the displacement according to the audio signal. Therefore,
the pillow user vibrates by transmitting vibration to the back of the head by the vibration of the
vibration pad 34, and this vibration vibrates the ossicles and cochleas from the skull, and as a
result, the auditory nerve is stimulated to listen to the music of the CD player 52. Can. Therefore,
since the bone conduction speaker built-in pillow 10 of the present invention listens to music and
the like generated from the CD player 52 by bone conduction sound, the surrounding people can
not hear the music and the like generated from the CD player 52. There is no need to bother you.
In addition, when listening to music and the like by bone conduction, there is little tiredness of
the ear and there is no need to use headphones when listening to music and the like, and there is
no pressure on the ear like when headphones are used. Furthermore, when listening to music
through bone conduction unlike the case of listening to music through air conduction as
described above, the eardrum is not used, so even people who have trouble with the eardrum and
who can not easily listen to music through air conduction are clear sounds You can enjoy In the
embodiment, the pillow main body 12 of the bone conduction speaker built-in pillow 10 is
integrally formed of urethane 14, but the material constituting the pillow main body 12 is not
limited to urethane 14, and the pillow main body Of course, 12 is not limited to what was
integrally formed. Although the CD player 52 is shown as the sound device of the bone
conduction speaker built-in pillow 10 in the embodiment, it goes without saying that an MD
player, a radio or the like other than the CD player 52 may be used. [Effects of the Invention] The
bone conduction speaker built-in pillow of the present invention listens to the sound by bone
conduction, so people around can not hear the sound, so enjoy listening to music etc without
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disturbing the people around It has the excellent effect of being able to be relaxed as well as
being able to In addition, the bone conduction speaker built-in pillow of the present invention is
excellent in that there is little tiredness of the ear to listen to music and the like by bone
conduction and there is no need to use headphones so there is no pressure on the ears felt when
using headphones. Effect. Furthermore, since the pillow with a bone conduction speaker
according to the present invention listens to the sound without using the tympanic membrane, it
has an excellent effect of being able to enjoy clear sound even for people who have trouble with
the tympanic membrane and can not hear air conducted sound. Have. BRIEF DESCRIPTION OF
THE DRAWINGS FIG. 1 is a schematic view of setting a bone conduction speaker built-in pillow
according to an embodiment.
FIG. 2 is a plan view of the bone conduction speaker built-in pillow of the embodiment. FIG. 3 is a
front view of the bone conduction speaker built-in pillow of the embodiment. FIG. 4 is a
perspective view of the bone conduction speaker built-in pillow of the embodiment. FIG. 5 is a
longitudinal sectional view of the bone conduction speaker built-in pillow of the embodiment.
FIG. 6 is a longitudinal sectional view of the bone conduction speaker provided in the bone
conduction speaker built-in pillow according to the embodiment. [Description of the code] 10
bone conduction speaker built-in pillow 12 pillow main body 16 depression 17 inclination part
18 bone conduction device accommodation hole 20 bone conduction speaker 22 casing 24 super
magnetostrictive rod 26 magnetic field generating electromagnetic coil 28 bias magnetic field
generating magnet 30 flat spring 32 Movable rod 34 Vibration pad 44 Dedicated amplifier 52
CD player 54 Dedicated AC adapter
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