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JP2008147732

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DESCRIPTION JP2008147732
An object of the present invention is to provide a bone conduction speaker capable of achieving
downsizing and weight reduction while maintaining the efficiency of bone conduction,
simplifying the manufacturing process and reducing the manufacturing cost. SOLUTION: A case
base 2 on which a recess 25 having a substantially circular bottom surface 20 is formed, a voice
coil 3 accommodated in the recess 25 and fixing constituting an inner wall 23 of the recess 25 in
the case base 2 The diaphragm 4 attached to the portion 22 and extended to the upper side of
the voice coil 3 accommodated in the recess 25, the magnet 5 attached to the substantially
central position 40 on the upper surface side of the diaphragm 4, and the case base It comprised
from the lid 7 attached to the upper part of 2. [Selected figure] Figure 4
Bone conduction speaker
[0001]
The present invention relates to a bone conduction speaker, and more particularly to a bone
conduction speaker that can be reduced in size and weight while maintaining the efficiency of
bone conduction, and can also be reduced in manufacturing cost.
[0002]
Usually, the vibration of the sound transmitted by the sound wave is transmitted to the tympanic
membrane in the ear.
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There are three bones (ears bones) in the tympanic membrane, the vibrations of the tympanic
membrane are transmitted through this bone to the screw-like cochlea. In the cochlea, there is
limba fluid, and the vibration of this lymph fluid is transmitted to the auditory nerve while being
converted to an electrical signal, and the brain recognizes the sound. On the other hand, bone
conduction is the process in which the vibration in the above mechanism passes through the
tympanic membrane and the ossicles. That is, even if a person with a deafness or the like has an
abnormality in the eardrum and earlobes, the vibration of the sound is sent directly to the
cochlea via the skull, but if the cochlea and the auditory nerve are normal, this bone conduction
can surely hear the sound. it can. A speaker to which this principle is applied is a bone
conduction speaker (see, for example, Patent Document 1). )である。
[0003]
Although a wide variety of bone conduction speakers have been developed, the prior art consists
of a case base, a yoke, a magnet, a voice coil and a vibrating member. Also, most vibrating
members are in the form of multiple plates stacked one on another, and the magnets are
arranged side by side with the voice coil. Therefore, the conventional bone conduction speaker
has a problem that it is wide, large and heavy as compared with ordinary headphones and
earphones. Further, with such a structure, there is a problem that the manufacturing process is
complicated, the cost is high, and the unit price is high.
[0004]
In particular, in recent years, there has been a demand for downsizing and weight reduction so
that bone conduction speakers can also be used by being attached to mobile phones and MP3
players. However, at present, miniaturization and weight reduction are possible without reducing
the efficiency of bone conduction. The reality is that no implementation has been provided.
[0005]
Japanese Patent Application Publication No. 2003-340370
[0006]
Therefore, in view of the above-described situation, the present invention can achieve
miniaturization and weight reduction while maintaining the efficiency of bone conduction, can
simplify the manufacturing process, and can reduce the manufacturing cost. The point is to
provide a bone conduction speaker.
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[0007]
In order to solve the problems described above, the present invention configures a case base on
which a recess having a substantially circular bottom surface is formed, a voice coil housed in the
recess, and an inner wall of the recess in the case base. The diaphragm attached to the fixed
portion and extended to the upper side of the voice coil accommodated in the recess, the magnet
attached to the substantially central position on the upper surface side of the diaphragm, and the
top of the case base The bone conduction speaker characterized in that it was constituted from a
lid attached and was constituted.
[0008]
Here, it is preferable that a pole screw projecting upward from a substantially central portion of
the bottom surface of the recess be integrally provided with the case base, and the voice coil be
disposed around the pole screw, specifically, the pole screw It may be integrally molded together
with the case base using a metal material.
[0009]
Further, it is preferable that the inner wall surface of the concave portion is formed in a curved
surface substantially parallel to the outer peripheral surface of the voice coil to be stored.
[0010]
In addition, it is preferable that at least one elongated hole vertically penetrated is provided along
the periphery of the magnet attachment position in the diaphragm.
[0011]
Furthermore, the magnet is a rectangular solid, and a metal cover is provided on the inner
surface side of the lid to cover at least a part of the upper surface to the side surface of the
magnet.
The metal cover is preferably made of a nonmagnetic material.
And the concave part which receives the magnet covered by the said metal cover is provided in
the corresponding position of the said lid inner surface.
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[0012]
Further, it is preferable that a pair of the fixing portions be provided at positions facing each
other with the concave portion interposed therebetween, and both end portions of the diaphragm
be fixed to the upper surface of each fixing portion.
[0013]
According to the bone conduction speaker of the present invention as described above, the
magnet is attached to a substantially central position of the upper surface of the diaphragm
provided above the voice coil, without requiring a complicated attachment structure. By reducing
the weight and size of each component, the overall weight and size can be easily reduced, the
manufacturing process can be simplified, and the manufacturing cost can be reduced.
In particular, since the magnet is not located on the side of the voice coil, it can be miniaturized
enough to be easily connected to small electronic devices such as mobile phones, PDAs, MP3
players, etc. Become.
[0014]
In addition, since the pole screw is formed on the case base, the voice coil is disposed here, and
the diaphragm and the magnet are located on the top, bones are not necessary even if the
magnet is not placed on the side of the voice coil. The efficiency of conduction does not decrease,
and sufficient efficiency can be maintained.
[0015]
In addition, since a pole screw projecting upward from the approximate center of the bottom of
the recess is integrally provided with the case base, and the voice coil is disposed around the pole
screw, excellent bone conduction efficiency can be maintained while achieving downsizing. In
particular, if the pole bis is integrally molded with the case base using a metal material, the
manufacturing efficiency is improved and the cost can be further reduced.
[0016]
Further, since the inner wall surface of the concave portion is formed in a curved surface
substantially parallel to the outer peripheral surface of the voice coil to be stored, excellent
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vibration efficiency can be maintained without inhibiting the vibration of the voice coil.
[0017]
Further, since at least one elongated hole vertically penetrated is provided along the periphery of
the magnet attachment position in the diaphragm, the amplitude of the diaphragm can be
increased to enhance the bone conduction efficiency.
[0018]
Further, since the magnet is a rectangular solid, and a metal cover covering the top surface to at
least a part of the side surface of the magnet is provided on the inner surface side of the lid, in
particular, a metal cover composed of a nonmagnetic material is provided. The magnetic wire of
the magnet can be concentrated on the voice coil side to enhance the vibration efficiency, and
also prevent the exposure of magnetic lines of force to the outside and block the influence of the
magnetic force generated from the bone conduction speaker on the human body it can.
[0019]
Further, since the concave portion for receiving the magnet covered by the metal cover is
provided at the corresponding position of the inner surface of the lid, the bone conduction can be
efficiently transmitted to the human body through the lid.
[0020]
Further, a pair of the fixing portions are provided at positions facing each other with the recess
interposed therebetween, and both ends of the diaphragm are respectively fixed to the upper
surfaces of the respective fixing portions. Realize a structure that can be transmitted to the
diaphragm.
[0021]
Next, an embodiment of the present invention will be described in detail with reference to the
attached drawings.
[0022]
1 is a perspective view showing a bone conduction speaker according to a representative
embodiment of the present invention, FIG. 2 is a longitudinal sectional view, FIG. 3 is an exploded
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sectional view, and FIG. 4 is an exploded perspective view.
In the figure, reference numeral 1 indicates a bone conduction speaker, 2 indicates a case base, 3
indicates a voice coil, 4 indicates a diaphragm, 5 indicates a magnet, 6 indicates a metal cover,
and 7 indicates a lid.
[0023]
As shown in FIGS. 2 to 4, the bone conduction speaker 1 has a case base 2 in which a recess 25
having a substantially circular bottom surface 20 is formed, a voice coil 3 housed in the recess
25, and a case base 2. The diaphragm 4 is attached to the fixed portion 22 constituting the inner
wall 23 of the recess 25 and is disposed above the voice coil 3 accommodated in the recess 25
and a substantially central position 40 on the upper surface side of the diaphragm 4. And a lid 7
attached to the upper portion of the case base 2.
[0024]
A pole screw 21 protruding upward is disposed at a substantially central portion of the bottom
surface 20 of the recess of the case base 2.
The pole screw 21 is provided integrally with the case base 2, and the voice coil 3 is disposed
around the pole screw 21.
Further, a pair of fixing portions 22, 22 are provided at positions facing each other across the
recess 25 of the case base 2, and the inner wall 23 of the recess 25 formed by the fixing portion
22 is a voice coil 3. In order to be able to fix and support stably, it is formed on a curved surface
having a radius slightly larger than that of the voice coil 3 and substantially parallel to the outer
peripheral surface of the voice coil 3.
[0025]
The both ends 44 and 44 of the diaphragm 4 are respectively fixed to the upper surfaces of the
fixing portions 22 so that the diaphragm 4 is constructed above the recess 25 in which the pole
screw 21 is accommodated.
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The height of the upper surface of the fixing portion 22 is formed slightly higher than the upper
surface of the pole screw 21.
Therefore, in the state in which the diaphragm 4 is bridged between the fixing portions 22, a
constant gap is formed between the diaphragm 4 and the pole screw 21.
As described above, the case base 2 plays the role of a yoke in addition to the role of fixing and
supporting the voice coil 3 and the like, so that several components can be simplified into one.
[0026]
As described above, it is desirable that the pole screw 21 be integrally formed with the case base
2 using a metal material in order to make the pole screw 21 double as a yoke and to minimize
the manufacturing process and the manufacturing cost.
Specifically, it can be formed by cutting or casting a solid metal material.
[0027]
The voice coil 3 is coupled to the pole screw 21 of the case base 2.
Here, the thickness (height) of the voice coil 3 is set to substantially the same size as the height
of the pole screw 21.
Therefore, a fixed gap is formed between the upper surfaces of the voice coil 3 and the pole
screw 21 and the diaphragm 4.
[0028]
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Further, both ends of the coil wire of the voice coil 3 are extended from the bottom surface 20 to
the lower surface of the case base 2 and electrically connected to the terminals 27 disposed with
the insulator 26 interposed as shown in FIG. It is connected.
A sound signal is input to the voice coil 3 through the terminal 27.
[0029]
The diaphragm 4 is formed of a substantially flat member, and has a substantially circular
vibration area 4a similar to the shape of the concave bottom surface 20 and a fixed area 4b
having a shape similar to the upper surface shape of the fixed section 22. , Is disposed above the
voice coil 3 and vibrates at a predetermined frequency at the same time to prevent detachment
of the voice coil 3.
In this example, the mounting screws 43, 43 passing through the through holes 42, 42 formed in
the fixing area 4b of the diaphragm 4 are fixed to the screw holes 24, 24 formed on the upper
surface of the fixing portions 22, 22, respectively. By doing this, it is installed between the upper
surfaces of the fixing portions 22, 22.
[0030]
A plurality of elongated holes 41 vertically penetrating are formed along the circumferential
direction around the peripheral portion of the vibration area 4 a of the diaphragm 4, that is,
around the central position 40 to which the magnet 5 is attached.
By forming at least one elongated hole 41 in the vibration area 4a as described above, the
vibration efficiency or bone conduction efficiency of the diaphragm 4 is improved.
In the present example, a total of four elongated holes 41 are formed at vertically and
horizontally symmetrical positions, but it is possible to use less than 4 or 5 or more, and the
positions of each side of the triangle and the positions of each side of the square are also
possible. A variety of forms are possible, such as positions of sides of a pentagon, positions of
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sides of a hexagon, and positions along a circle.
[0031]
The magnet 5 is a rectangular solid and is fixed at a substantially central position 40 of the
vibration area 4 a on the upper surface of the diaphragm 4 and interacts (attractive force or
repulsive force) with the voice coil 3.
The magnet 5 is fixed to the inner vibration area 4a surrounded by the long holes 41,... This
position is preferable in terms of vibration efficiency or bone conduction efficiency. Further, it is
desirable that the magnet 5 be formed in a region corresponding to the center of the voice coil 3
or the center of the pole screw 21 in order to enhance the efficiency of the vibration or the bone
conduction. Therefore, conventionally, a large number of magnets had to be provided, but in the
present invention, only one is sufficient. Of course, the number of magnets 5 is not limited at all,
and two or more magnets can also be used. As for the shape, in addition to the rectangular
parallelepiped, a triangular prism, a cylinder, a pentagonal prism, and other various shapes can
be adopted.
[0032]
On the other hand, a metal cover 6 is provided to cover from the upper surface of the magnet 5
to at least a part of the side surface so that magnetic lines of force of the magnet 5 can be
directed to the voice coil 3. In particular, the cover 6 is made of a metal material, such as a
nonmagnetic material, to which the magnetic lines of force can not penetrate so that the
magnetic lines of force of the magnet 5 can be concentrated on the voice coil 3 side. It comprises
a covering portion 62 to be covered and fixing pieces 63, 63 extending to both sides. A recess 70
for receiving the cover 62 of the metal cover 6 together with the magnet 5 is provided at a
position corresponding to the magnet 5 on the inner surface of the lid 7, and the through hole 60
formed in the fixing piece 63 is formed. It is fixed to the inner surface side by attaching the
penetrating mounting screw 61 to a screw hole 71 formed on the inner surface side of the lid 7.
[0033]
The bone conduction speaker 1 according to the present embodiment having the above structure
operates as follows.
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[0034]
First, when a current signal corresponding to a predetermined voice signal is transmitted to the
voice coil 3, the voice coil 3 vibrates at a predetermined frequency due to the magnetic force or
attractive force of the magnet 5, the pole screw 21 and the recess inner wall 23.
[0035]
The diaphragm 4 located above the voice coil 3 is vibrated together by the vibration transmitted
from the voice coil 3 through the fixing portion 22.
At this time, since a large number of elongated holes 41 are formed in the diaphragm 4, the
diaphragm 4 vibrates with a larger amplification than the voice coil 3.
[0036]
The vibration phenomenon of the diaphragm 4 is transmitted to the magnet 5 and the metal
cover 6 mounted thereon, and transmitted to the scalp of the human body through the lid 7.
As a result, even a deaf person with an abnormality in the eardrum and earlobes in the skull of
the human body can surely hear the sound if the cochlea and the auditory nerve are normal.
[0037]
Although the embodiments of the present invention have been described above, the present
invention is not limited to these examples, and it is needless to say that the present invention can
be practiced in various forms without departing from the scope of the present invention.
[0038]
The results of measuring the exposure of the magnetic force generated from the bone conduction
speaker 1 of the embodiment of the present invention configured as described above and the
magnetic force from the bone conduction speaker of the comparative examples 1 to 3 of other
structures 5 and 6 respectively.
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[0039]
FIG. 5 (a) shows the results of measurement of the magnetic force exposure of the bone
conduction speaker of the embodiment shown in FIGS. 1 to 4, and FIG. The bone conduction
speaker of claim 2005-334524, that is, an extension is formed in the yoke, a voice coil and a
central magnetic pole are formed in the yoke, a diaphragm on which an iron piece is attached is
fixed, and a magnet is attached The result of the exposure measurement of the magnetic force of
the bone conduction speaker which was made to show is shown.
[0040]
FIG. 6 (a) shows, as Comparative Example 2, a result of measurement of magnetic force exposure
of a bone conduction speaker having a structure in which an iron plate is further placed on the
upper part of the magnet in addition to the structure of Comparative Example 1 above, In
Comparative Example 3, a voice coil is mounted on the bone conduction speaker described in JPA-2006-33787, that is, the central magnetic pole of the yoke, and the magnet is disposed on the
short side end of both sides of the yoke, The result of the exposure measurement of the magnetic
force of the bone conduction speaker which has arrange | positioned the diaphragm fixing | fixed
part on the outer side of each said magnet on the said magnet arrangement | positioning axis is
shown.
[0041]
The measurement results in FIGS. 5 and 6 indicate that the smaller the number of dots in the left
half circle in the figure, the smaller the amount of magnetic force exposed to the outside.
In addition, the state of magnetic lines of force is shown in the semicircle on the right side of the
figure.
As can be seen from FIGS. 5 and 6, in the example, the magnetic force exposed to the outside is
significantly less than in Comparative Examples 1 to 3, and the magnetic lines of force are
substantially converged.
Therefore, it is understood that the influence on the human body is also reduced.
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In Comparative Example 1, leakage of the magnetic force in the upper direction of the magnet is
large. Further, in the second comparative example, the leakage amount is reduced by the amount
of the iron plate placed, and it is complemented so as to go to the lower yoke side, but it is not an
ideal magnetic circuit due to the leakage amount. Even in Comparative Example 3, there was
leakage to the outside.
[0042]
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view of a bone conduction
speaker according to a representative embodiment of the present invention. Sectional drawing
which similarly shows a bone conduction speaker. Similarly, an exploded sectional view showing
a bone conduction speaker. The disassembled perspective view which similarly shows a bone
conduction speaker. The figure which shows the result of having measured exposure of the
magnetic force of Example 1 and Comparative Example 1. The figure which shows the result of
having measured the exposure of the magnetic force of Comparative Examples 2 and 3.
Explanation of sign
[0043]
DESCRIPTION OF SYMBOLS 1 bone conduction speaker 2 case base 3 voice coil 4 diaphragm 4a
vibration area 4b fixed area 5 magnet 6 metal cover 7 lid 20 bottom surface 21 pole screw 22
fixed part 23 inner wall 24 screw hole 25 recessed part 26 insulator 27 terminal 40 center
Position 41 long hole 42 through hole 43 mounting screw 44 end 60 through hole 61 mounting
screw 62 covering portion 63 fixing piece 70 recessed portion 71 screw hole
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