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DESCRIPTION JP2014127786

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DESCRIPTION JP2014127786
Abstract: In a speaker device, it is possible to increase driving noise and to further improve the
quality. SOLUTION: A drive magnet 33 is disposed in a tubular speaker yoke 31. The vibrating
film 43 is fixed on the open end side of the speaker yoke 31 so as to face the end face of the
drive magnet 33 at a distance. The vibrating film 43 has a voice coil 49 which is inserted into a
gap between the drive magnet 33 and the speaker yoke 31 and is displaced by an audio signal. A
control magnet plate 53 is disposed on the front surface of the vibrating membrane 43. The
control magnet plate 53 is magnetized such that the area facing the drive magnet 33 or the
speaker yoke 31 in the approach state approaches the same magnetic pole as the area facing the
periphery of the end face of the drive magnet 33 or the speaker yoke 31. [Selected figure] Figure
1
Speaker device
[0001]
The present invention relates to a speaker device, and, for example, to an improvement of the
speaker device suitable for use in an earphone device such as an earphone or a headphone worn
on a user's ear.
[0002]
Conventionally, as an earphone device to be attached to a user's ear, for example, as shown in
FIG. 8, one end face of a cylindrical drive magnet 5 is fixed in a cup-shaped yoke 3 disposed in a
case main body 1 A thin diaphragm 7 is fixed to the end of the yoke 3 so as to face the other end
face of the space 5 at a distance, and the cylindrical voice coil 9 fixed to the diaphragm 7 is
covered. It is well known that the magnet 3 is inserted and arranged at a small distance on the
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outer periphery thereof.
[0003]
In FIG. 8, the case main body 1 includes a funnel-shaped base portion 1a and a front cover 1b
covering the front end (right side in the drawing), and the open end of the yoke 3 is fixed in the
front cover 1b. Reference numeral 11 denotes a plurality of sound through holes which are on
the front surface of the diaphragm 7 and are formed through the front cover 1b, and reference
numeral 13 denotes a cable which is led to the outside, and a knot 13a is formed in the base 1a.
[0004]
In this earphone device, the drive unit 15 for vibrating the diaphragm 7 is formed by the yoke 3,
the drive magnet 5 and the voice coil 9, and the diaphragm 7 is formed by applying an audio
signal to the voice coil 9 from the outside with the cable 13. The sound is vibrated to be
produced, and the sound produced is transmitted from the sound through hole 11 on the front
surface of the diaphragm 7 to the outside.
[0005]
Then, this type of earphone device is commercialized, for example, in the configuration of the
concha tube insertion type or the external ear canal insertion type.
[0006]
For example, as shown in FIG. 9, the ear canal insertion type earphone device has a configuration
in which the configuration of FIG. 8 is slightly changed, and an ear shell surrounded by a user's
tragus 17, a toe 19 and a concha 21. The case main body 1 is inserted into the intercalation
cavity 23 with the vibrating membrane 7 in close proximity to the concha 21, and the external
ear canal 25 extending from the conjunctival cavity 23 to the tympanic membrane (not shown)
projects from the case main body 1 It has the structure which inserts and uses the provided
sound penetration cylinder body 27. FIG.
FIG. 9 shows a state in which the earphone device is attached to the left ear.
[0007]
The reference numeral 29 in FIG. 9 is a flexible ear tip (ear pad, ear piece) fitted around the outer
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periphery of the sound-passing cylinder 27 and elastically abuts against the inner wall of the ear
canal 25.
[0008]
However, in the above-described earphone device, leakage magnetic flux is likely to be generated
in the magnetic gap between the drive magnet 5 and the yoke 3, and the displacement of the
voice coil 9 is increased to increase the vibration of the vibrating film 7 to improve sound
generation. There is a limit to that, and there is also a limit to improving the speaker
characteristics.
[0009]
Conventionally, for example, Japanese Patent Application Laid-Open No. 10-112896 (Patent
Document 1) “Magnetic circuit for speaker” has been proposed as a configuration for
suppressing the occurrence of leakage magnetic flux of a magnetic circuit.
[0010]
This patent document 1 is a speaker magnetic circuit which has a magnet and a yoke to form a
magnetic gap, and is fixed to the magnetic circuit surface along the magnetic gap formed in the
magnetic circuit surface on the side where the diaphragm is disposed. The magnet has a
configuration in which the magnetic pole is on the surface opposite to the surface fixed to the
magnetic circuit and the surface fixed to the magnetic circuit and the same pole surface is fixed
to the magnetic pole generated on the surface to which the magnet of the magnetic circuit is
fixed. An inexpensive and easily available general magnetic circuit component is used to reduce
the leakage flux from the magnetic gap and to increase the magnetic flux density in the magnetic
gap.
[0011]
JP 10-112896 A
[0012]
However, in the speaker magnetic circuit described above, since small chip-like magnet pieces
are disposed on the center pole or top plate of the yoke, it is not sufficient to reduce the leakage
flux from the magnetic gap, and the sound level and speaker characteristics Further
improvement and devise are necessary to improve.
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[0013]
The present invention has been made to solve such problems, and it is easy to effectively reduce
the leakage flux from the magnetic gap, to improve the sound generation level, and to improve
the speaker characteristics. An object of the present invention is to provide a speaker device
capable of quality improvement and output increase.
[0014]
In order to solve such a problem, the speaker device according to the present invention includes
a cylindrical speaker yoke and a magnet which is magnetized and coaxially disposed in the
speaker yoke, and is disposed between the open end side of the speaker yoke The drive magnet
forming the magnetic circuit and the open end side of the speaker yoke are fixed to face each
other at a distance from the end face of the drive magnet, and are inserted and applied to the gap
between the drive magnet and the speaker yoke A vibrating membrane having a voice coil
displaced by a signal and a control magnet plate disposed at an interval on the front surface of
the vibrating membrane, and a region facing the drive magnet or the speaker yoke in a close
state is a drive And a control magnet plate magnetized so as to have the same magnetic pole with
respect to the magnetic pole of the magnet or the speaker yoke.
[0015]
In the speaker device of the present invention, the control magnet plate has substantially the
same shape as the outer diameter of the end face of the drive magnet, and the peripheral region
facing the end face of the drive magnet is magnetized by the same magnetic pole Configuration is
also possible.
[0016]
The speaker device of the present invention may have a configuration in which the control
magnet plate is formed in a ring shape.
[0017]
In the speaker device of the present invention, the control magnet plate is formed in a ring shape
having an inner diameter slightly larger than or approximately the same as the inner diameter of
the speaker yoke, and the speaker faces the drive magnet with the voice coil interposed
therebetween. A configuration is also possible in which the area facing the end face area of the
yoke is magnetized to the same magnetic pole.
[0018]
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In the speaker device according to the present invention, the speaker yoke is disposed inside the
main body case having a sound passing hole through which the vibration sound from the
vibrating membrane is passed to the outside, with the vibrating membrane facing the sound
passing hole. A configuration is also possible in which the magnet plate is provided on the inner
wall of the main body case and disposed in the vicinity of the sound passing hole.
[0019]
In the speaker device according to the present invention, the speaker yoke is disposed inside the
main body case having a sound through hole through which the vibration sound from the
vibrating film is passed to the outside, the back side being the sound through hole side, A
configuration is also possible in which the plate is located at the inner wall of the main body case
and at a position far from the sound passage.
[0020]
In the speaker device of the present invention, the control magnet plate may have a first through
hole, and the main body case may have a second through hole whose position is aligned with the
first through hole.
[0021]
In such a speaker device of the present invention, in the control magnet plate disposed at a
distance in front of the diaphragm, the region facing and facing the drive magnet or the speaker
yoke is the magnetic pole of the drive magnet or the speaker yoke Since the magnetic poles are
magnetized to the same magnetic pole, the magnetic flux generated from the control magnet
effectively reduces and compresses the leakage magnetic flux that tends to be generated in the
magnetic gap between the drive magnet and the speaker yoke, changing the conventional
speaker configuration Therefore, it is easy to improve the sound generation level and the speaker
characteristics, and it is possible to improve the quality of the driving sound and to increase the
output.
[0022]
In the speaker device of the present invention, the control magnet plate has substantially the
same shape as the outer diameter of the end face of the drive magnet, and the peripheral region
facing the end face of the drive magnet is magnetized by the same magnetic pole In the
configuration it is possible to reliably reduce the leakage flux.
[0023]
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In the speaker device of the present invention, when the control magnet plate is formed in a ring
shape, in addition to the above-described effects, the sound from the diaphragm can be
effectively propagated to the outside.
[0024]
In the speaker device according to the present invention, the control magnet plate is formed in a
ring shape having an inner diameter slightly larger than or approximately equal to the inner
diameter of the speaker yoke, and the speaker faces the drive magnet with the voice coil
interposed therebetween. If the area facing the end face area of the yoke is magnetized to the
same magnetic pole, in addition to the above-mentioned effects, the sound from the vibrating
membrane can be more effectively propagated to the outside.
[0025]
In the speaker device according to the present invention, the speaker yoke is disposed inside the
main body case having a sound through hole for passing vibration sound to the outside with the
vibrating film on the sound through hole side, and the control magnet plate is the main body If
the configuration is provided on the inner wall of the case and disposed in the vicinity of the
sound passing hole, it is easy to obtain the above-described effect even in a specific product.
[0026]
In the speaker apparatus according to the present invention, the speaker yoke is disposed inside
the main body case having a sound through hole for passing vibration sound to the outside with
the back side facing the sound through hole, and the control magnet plate is the main body If it is
in the inner wall of the case and arranged at a position far from the sound through hole, it is easy
to obtain the above effect even in a specific product.
[0027]
In the speaker device of the present invention, if the control magnet plate has the first through
hole and the main body case has the second through hole whose position is aligned with the first
through hole, the adjustment of the frequency characteristic is performed. Is also possible.
[0028]
It is a schematic longitudinal cross-sectional view which shows embodiment of the speaker
apparatus which concerns on this invention.
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It is a longitudinal cross-sectional view explaining the state which commercialized the speaker
apparatus of FIG.
It is the schematic explaining the operation | movement of the speaker apparatus of FIG.
It is the characteristic view which compared the presence or absence of magnetization of the
control magnet board in the speaker apparatus of FIG.
It is a longitudinal cross-sectional view explaining the other state which commercialized the
speaker apparatus of FIG.
It is a schematic longitudinal cross-sectional view which shows other embodiment of the speaker
apparatus of this invention.
It is a schematic longitudinal cross-sectional view which shows other embodiment of the speaker
apparatus of this invention.
It is a longitudinal cross-sectional view which shows the conventional earphone apparatus.
It is a longitudinal cross-sectional view which shows the conventional earphone apparatus with
an example of use.
[0029]
Hereinafter, embodiments of a speaker device according to the present invention will be
described with reference to the drawings.
FIG. 1 is a schematic longitudinal sectional view showing an embodiment of a speaker device
according to the present invention.
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[0030]
In FIG. 1, the speaker yoke 31 is formed of a magnetic plate material in a cylindrical shape and
formed into a cup shape with a bottom, and the open end is on the lower side in the drawing and
not shown in FIG. Fixed).
A plurality of air vents are formed at the bottom of the speaker yoke 31.
[0031]
One end face of a known cylindrical or cylindrical drive magnet 33 is superimposed on the inner
bottom of the speaker yoke 31 and fixed downward in the drawing.
[0032]
The drive magnet 33 is located in the vicinity of a stepped portion 37 formed so that the other
end surface (tip end surface) is expanded outward in the vicinity of the tip of the side wall 35 of
the speaker yoke 31.
[0033]
On the other end face (tip face) of the drive magnet 33, a disc-like pressing plate 39 made of a
soft magnetic material such as iron and having a diameter slightly larger than the end face
dimension of the drive magnet 33 is superimposed.
The pressure plate 39 is not essential and can be identified with the drive magnet 33.
[0034]
The speaker yoke 31, the drive magnet 33 and the pressure plate 39 are integrally and coaxially
fixed by an adhesive or a snap which is not shown, and the step portion 37 of the speaker yoke
31 and the pressure plate 39 are at substantially the same level position. Are facing each other.
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[0035]
In the drive magnet 33, the bottom side of the speaker yoke 31 is, for example, S pole, and the
other end face (tip end face) side, that is, the vibrating membrane 43 side described later is N
pole. There is.
[0036]
Therefore, a magnetic circuit is formed by the magnetic flux from the pressure plate 39 between
the outer periphery of the pressure plate 39 and the step portion 37 of the speaker yoke 31
opposed to the outer periphery of the pressure plate 39 slightly. It has become.
[0037]
A ring plate-shaped circuit board 41 is fixed to the outer surface of the bottom portion of the
speaker yoke 31, and an electronic device (not shown) is attached to the circuit board 41 by a
cable (see FIG. 8) not shown.
An audio signal is supplied from
[0038]
The vibrating film 43 is formed in the shape of a disk from a conventionally known film material,
and has a central region 45 in which the central portion is bulged in a convex shape upward in
the figure and an annular outer periphery surrounding the central region 45 The outer edge of
the outer peripheral area 47 is supported and fixed on the side of the open end face (tip end) of
the speaker yoke 31 so as to cover the area.
[0039]
The outer peripheral region 47 of the vibrating membrane 43 is formed with radial fine uneven
stripes called a so-called corrugation edge, and is in a state slightly recessed as compared with
the central region 45.
[0040]
One end face side of the cylindrical voice coil 49 is fixed so as to surround the central region 45
at an annular boundary between the central region 45 and the outer peripheral region 47 on one
surface side (upper surface side in the drawing) of the vibrating membrane 43 The voice coil 49
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is inserted and arranged on the outer periphery of the drive magnet 33 at a slight interval.
[0041]
Therefore, the drive magnet 33 and the side wall 35 of the speaker yoke 31 face each other in a
ring shape with a slight gap so as to sandwich the voice coil 49.
[0042]
In the diaphragm 43, on the same surface as the voice coil 49, a lead wire (not shown) extends
from the voice coil 49 to the outer edge and is connected to the circuit board 41, and the voice
signal to the voice coil 49 via the lead wire. By the application, the voice coil 49 is displaced, and
the vibrating membrane 43 is driven to vibrate.
[0043]
That is, a drive unit 51 for vibrating and driving the vibrating film 43 is formed by the speaker
yoke 31, the drive magnet 33 and the voice coil 49, and a so-called inner magnet type speaker is
configured.
[0044]
A disc-like control magnet plate 53 is disposed on the front surface (downward in FIG. 1) of the
vibrating membrane 43 with a slight gap therebetween and the vibrating membrane 43 is
interposed therebetween. Fixed).
[0045]
The control magnet plate 53 has a disk shape having an outer diameter dimension φb slightly
smaller or equal to the end face side outer diameter dimension φa of the holding plate 39, and is
shared with the speaker yoke 31, the drive magnet 33 and the diaphragm 43. It is arranged
axially and in parallel with the end face of the drive magnet 33 or the pressure plate 39, and the
facing outer peripheral region is magnetized to the N pole.
[0046]
That is, in the outer peripheral area of the control magnet plate 53, the area facing the end
surface outer periphery of the drive magnet 33 (holding plate 39) in the approach state is the
same as the outer peripheral area of the driving magnet 33 (holding plate 39) facing this. The
outer edge of the surface (upper surface in FIG. 1) which is magnetized so as to become the N
pole of the magnetic pole and does not face the drive magnet 33 (the pressure plate 39) is
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magnetized to the S pole.
[0047]
The control magnet plate 53 is disposed at a slight distance from the vibrating membrane 43 to
such an extent that the vibrating membrane 43 does not abut on the basis of the maximum
vibration displacement of the vibrating membrane 43.
[0048]
The control magnet plate 53 has a control function of suppressing the diffusion of the leakage
flux from the outer periphery of the holding plate 39 to the step portion 37 of the speaker yoke
31 and compressing it.
[0049]
For example, as shown in FIG. 2, in the speaker device having such a configuration, the speaker
yoke 31 is disposed in the cup-shaped base portion 57 of the case main body 55 formed of
insulating synthetic resin in a bottomed cylindrical shape; The front cover 59 is covered so as to
cover the vibrating membrane 43, and the control magnet plate 53 is supported and fixed to the
inner wall of the front cover 59, and the product is commercialized as an earphone device.
[0050]
Further, in such a speaker device, by applying an audio signal to the voice coil 49, the drive unit
51 causes the diaphragm 43 to vibrate and the vibration sound propagates to the outside from
the sound through hole 61 formed in the front cover 59. Be done.
In addition, illustration of the ear tip (refer FIG. 5, FIG. 9) with which the outer periphery of the
sound pipe | tube 63 which forms the sound through hole 61 is filled is abbreviate | omitted.
[0051]
Then, as shown in FIG. 9 described above, the speaker device according to the present invention
accommodates the case main body 55 in the concha cavity 23 surrounded by the tragus 17, the
tragus 19, and the concha 21. The tip of the ear tip is inserted into the ear canal 25 and used.
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[0052]
Moreover, in the speaker device of the present invention, the control magnet plate 53 has
substantially the same shape as the drive magnet 33 (the presser plate 39) and is on one side of
the control magnet plate 53. The outer edge area facing in the close state is magnetized so as to
have the same N pole as the drive magnet 33 area facing this.
[0053]
Therefore, as shown in FIG. 3A, repulsion of the magnetic pole occurs between the end face of
the drive magnet 33 (holding plate 39) and the peripheral area of the control magnet plate 53,
and the speaker yoke 31 is viewed from the end face of the driving magnet 33 (holding plate 39).
It is possible to suppress the diffusion of the magnetic flux into the magnetic flux, to minimize
the occurrence of the leakage magnetic flux and to compress the magnetic flux density, thereby
reducing the driving loss of the vibrating membrane 43.
The voice coil 49 and the vibrating membrane 43 are not shown in FIG.
[0054]
In addition, by adjusting the distance between the end face of the drive magnet 33 (pressing
plate 39) and the control magnet plate 53 and the outer diameter of the control magnet plate 53,
it is also possible to control the magnitude of the leakage flux.
[0055]
In particular, the control magnet plate 53 is plate-like and can be obtained at low cost with a
large magnetization strength, and is easy to handle because it is not chip-like.
[0056]
In this respect, as shown in FIG. 3B, in the conventional configuration in which the control
magnet plate 53 is not disposed, the amount of leakage magnetic flux is large, the magnetic flux
density tends to decrease, and the improvement of the sound pressure level is limited.
[0057]
FIG. 4 is a frequency characteristic diagram of the speaker device (solid line A) of the present
invention and a conventional equivalent (dotted line B) without magnetizing the control magnet
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plate 53. The speaker according to the present invention corresponds to the conventional
configuration. Compared to the product, the sound pressure rises by about 4 dB in a wide range,
and in some cases it shows as much as 7 dB.
[0058]
Furthermore, as shown in FIG. 2, the control magnet plate 53 is formed with small holes that do
not significantly affect the frequency characteristics of the speaker, for example, the first through
holes 65 with a diameter of about 0.2 mm. Also, the first through holes 65 are aligned to form
small holes that do not significantly affect the frequency characteristics of the speaker, for
example, the second through holes 67 with a diameter of about 1 mm, and the first and second
through holes 65. Fine adjustment of the sound quality is also possible by adjusting the inner
diameter of.
[0059]
As described above, in the speaker device according to the present invention, the cylindrical
speaker yoke 31 and the magnetic circuit between the open end side of the speaker yoke 31 and
the coaxially disposed inside of the speaker yoke 31 while being magnetized and magnetized.
The drive magnet 33 is fixed to the open end side of the speaker yoke 31 so as to face the end
face of the drive magnet 33 at a distance, and is inserted into the gap between the drive magnet
33 and the speaker yoke 31 and applied. The diaphragm 43 having the voice coil 49 displaced
by the voice signal to be controlled and the control having the same shape as the outer diameter
shape of the end face side of the drive magnet 33 with a spacing on the front surface of the
diaphragm 43 The area of the magnet plate 53 facing the drive magnet 33 in the approach state
is the end face peripheral area of the drive magnet 33 and It is magnetized such that the
magnetic pole.
[0060]
Therefore, the diffusion of the magnetic flux from the end face of the drive magnet 33 (the
holding plate 39) to the speaker yoke 31 is suppressed by the peripheral magnetic pole of the
control magnet plate 53, the occurrence of the leakage flux is extremely reduced and the
magnetic flux density is increased. The driving loss can be reduced, and the vibrating membrane
43 is largely displaced and vibrated to increase the output, and the quality of the driving sound
can be enhanced in a wide range from the low range to the high range.
[0061]
Then, since the control magnet plate 53 is simply disposed, the basic configuration of the
conventional speaker device can be diverted as it is, the configuration of connecting and
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supplying the audio signal to the voice coil 49 is not complicated, and the configuration is simple.
It is.
[0062]
By the way, the speaker device according to the present invention, when commercialized, is
provided with the speaker yoke 31 in the cup-shaped base portion 57 of the case main body 55
as shown in FIG. The configuration is not limited to the configuration in which the vibrating
membrane 43 is covered with the front cover 59 having the body 63).
[0063]
For example, as shown in FIG. 5, the vibrating membrane 43 is disposed toward the inside of the
cup-shaped base 57 of the case main body 55, and the base 57 supports the rear side of the
speaker yoke 31 within the front cover 59; The control magnet plate 53 can be commercialized
in a configuration in which it is supported and fixed at a position far from the sound through
hole 61 (the sound passing cylinder 63), that is, the inner wall of the base 57.
[0064]
In FIG. 5, reference numeral 69 denotes an ear tip, reference numeral 71 denotes a cable holding
portion (not shown) for supplying an audio signal to the circuit board 41, and a plurality of
sounds produced by the diaphragm 43 are present at the bottom of the speaker yoke 31. Is
transmitted to the outside through the sound through hole 61 from the air vent of the.
[0065]
Furthermore, as shown in FIG. 6, the speaker device of the present invention can be configured to
use a ring-shaped control magnet plate 53 having a third sound passage 73 at the center, and the
produced sound can be vibrated by the diaphragm 43. It is useful for the configuration to be
effectively propagated to the outside from the center of the
The other configuration is the same as that shown in FIG.
[0066]
The third sound through hole 73 formed in the control magnet plate 53 is preferably formed as
large in diameter as possible from the viewpoint of effectively propagating the sound produced
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to the outside.
[0067]
In the speaker device of the present invention, as shown in FIG. 7, as the control magnet 53, the
third sound through hole 73 slightly larger in diameter φd or substantially equal in diameter to
the inner diameter φc of the side wall 35 of the speaker yoke 31 is provided. It is also possible
to use a configuration provided that the areas facing the end face area of the speaker yoke facing
the control magnet 53 with the voice coil 49 interposed therebetween are magnetized to the
same magnetic pole.
The other configuration is the same as that shown in FIG.
[0068]
In this configuration, the main point is that the control magnet plate 53 is in the speaker yoke 31
and has an outer diameter shape substantially the same as or slightly larger or smaller than the
inner diameter on the open end side expanded through the step 37 The third sound through hole
73 may have a diameter slightly larger than or approximately the same as the inner diameter of
the side wall 35 of the speaker yoke 31.
[0069]
Also in such a configuration, the diffusion of the magnetic flux from the end face of the drive
magnet 33 (the pressure plate 39) to the speaker yoke 31 is suppressed by the peripheral
magnetic pole of the control magnet plate 53, and the same effect as the configuration described
above is obtained.
[0070]
Further, in this configuration, since the central portion of the control magnet plate 53 is largely
perforated, the control magnet does not contact the central dome-like convex portion of the
diaphragm 43, so the control magnet can be made closer to the diaphragm and leakage flux It is
possible to reduce the
[0071]
Then, in the speaker device of the present invention, in the control magnet plate 53, the region
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facing the drive magnet 33 or the speaker yoke 31 in the approach state has the same magnetic
pole with respect to the end surface peripheral region of the drive magnet 33 or the speaker
yoke 31. It is not limited to the magnetized configuration.
[0072]
For example, not only the peripheral portion of the control magnet plate 53 approaching and
facing the drive magnet 33 or the speaker yoke 31, but a partial region of the end face of the
control magnet plate 53 may be magnetized to the same polarity. In the plate 53, any
configuration may be employed as long as regions facing the magnetic poles of the drive magnet
33 or the speaker yoke 31 are magnetized so as to have the same magnetic pole.
[0073]
Furthermore, the speaker device according to the present invention is widely applicable not only
to the above-described earphone device but also to a large or small headphone or hi-fi speaker
configuration and the like.
[0074]
1, 55 Case Body 1a, 57 Base 1b, 59 Front Cover 3 Yoke 5, 33 Drive Magnet 7, 43 Vibrating
Membrane 9, 49 Voice Coil 11, 61 Sound Through Hole 13 Cable 13a Knot 15, 51 Drive 17
Tragus 19 Tulle 21 Ear Concha 23 Ear cavity 25 External ear canal 27, 63 Sound tube 29, 29 Ear
tip 31 Speaker yoke 35 Side wall 37 Step 39 39 Plate 41 Circuit board 45 Central area 47 Outer
peripheral area 53 Control magnet board 65 First sound through hole 67 Second sound through
hole 71 Holding part 73 Third sound through hole
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