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JP2013232860

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DESCRIPTION JP2013232860
Abstract: PROBLEM TO BE SOLVED: To provide an earphone capable of listening to air
conduction noise and bone conduction noise of small size, high power and low power
consumption. SOLUTION: An armature portion in which a pair of plates 3 and 4 to which a pair
of coils 5 and 6 are attached respectively is fixed on both sides of an armature 2, cases 9 and 10
to which this armature portion is attached, and a pair of plates 3 and 4 Of the pair of magnets 7,
8 attached to the inner side of the cases 9, 10 facing each other, the pair of plates 3, 4, the pair
of coils 5, 6, and the pair of magnets 7, 8 symmetrical with respect to the armature 2. And the
centers of the armature 2 and the plates 3 and 4 are disposed on the central axes C of the
magnets 7 and 8 in a balanced electromagnetic structure. [Selected figure] Figure 1
Earphone and listening device using it
[0001]
The present invention relates to a balanced armature type (hereinafter referred to as balanced
type) electromagnetic earphone capable of listening to air conduction sound and bone
conduction sound, and a listening apparatus using the same.
[0002]
Piezoelectric and electromagnetic transducers are used in conventional earphones capable of
listening to air and bone conduction sounds.
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1
Further, Patent Document 1 includes a bone conduction speaker unit and a case which
accommodates the bone conduction speaker unit and serves as a vibrating portion, and the
compliance enhancing means is disposed along the peripheral portion of the vibration surface of
the case for fixing the bone conduction speaker unit. Bone conduction speaker is disclosed.
[0003]
JP 2004-274593 A
[0004]
However, in the conventional earphones using the above-mentioned transducer, there is no small
high-output one that can be used for a hearing aid or the like, and it is difficult to obtain high
output particularly in the frequency band of 2000 Hz or less important for conversation.
Moreover, in the bone conduction speaker described in Patent Document 1, when the size can be
inserted into the ear canal, the output becomes small and it is not useful.
[0005]
The present invention has been made in view of such problems in the prior art, and the object of
the present invention is to enable listening to air-conduction sound and bone-conduction sound
with small size, high output and low power consumption. It is an object of the present invention
to provide an earphone and a listening device using the same.
[0006]
In order to solve the above-mentioned problems, the invention according to claim 1 relates to an
armature portion in which a pair of plates to which a pair of coils are attached respectively is
fixed on both sides of an armature, a case to attach this armature portion, and the pair of plates.
The pair of magnets, the pair of coils, and the pair of magnets are symmetrical with respect to
the armature, and the center of the armature and the plate is the magnet The balance type
electromagnetic structure is disposed on the central axis of
[0007]
The invention according to claim 2 relates to the earphone according to claim 1, wherein a
junction of the plate with the armature is smaller than a surface of the plate facing the magnet.
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2
[0008]
According to a third aspect of the present invention, in the earphone according to the first or
second aspect, a through hole penetrating the case, the magnet, the plate, and the armature is
provided at the center.
[0009]
The invention according to claim 4 holds the outer peripheral portion of the earphone according
to any one of claims 1 to 3, and wears earplugs for holding the earphone in the ear canal.
[0010]
According to a fifth aspect of the present invention, a hearing device is configured using the
earphone according to any one of the first to fourth aspects for a hearing aid or an audio device.
[0011]
According to the invention of claim 1, a displacement amount larger than that of the unbalanced
type can be obtained, and a small-sized, high-output, low-power-consumption earphone can be
realized.
It is easy to use because it can be attached to the concha canal space and the ear canal.
Moreover, since there is no sound opening, there is no possibility of earlobe clogging, and since it
can be further cleaned, it can always be used cleanly.
[0012]
According to the second aspect of the present invention, the elastic displacement range of the
armature can be made larger without substantially impairing the driving force by reducing the
joint with the armature while maintaining the area of the surface of the plate facing the magnet.
Can.
[0013]
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According to the third aspect of the present invention, since the through hole acts as a vent, it
can be worn comfortably.
[0014]
According to the fourth aspect of the present invention, by attaching the ear plug to the
earphone, it can be stably held in the ear canal, and fluctuation of vibration output due to the
degree of holding in the ear canal can be suppressed.
Further, even if the earphone is larger than the ear canal, the earphone can be stably attached to
the concha cavity by attaching the ear plugs to the earphone.
[0015]
According to the fifth aspect of the present invention, since there is no sound opening, there is no
possibility of earlobe clogging and further cleaning can be performed, so that it can always be
used cleanly as a hearing aid or earphone of an audio device.
Also, it can be used as a waterproof hearing aid or an earphone of a waterproof audio device.
[0016]
BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of 1st Embodiment of the
earphone which concerns on this invention, (a) is a top view, (b) is sectional drawing at the time
of making a junction with the armature of the top view plate of a sectional view armature
smaller. It is explanatory drawing of 2nd Embodiment of the earphone which concerns, (a) is a
top view, (b) is sectional drawing and explanatory drawing of the ear hook type hearing aid
which mounted earplugs on the earphone, (a) is a perspective view, b) is an explanatory view of
the ear clip for the wearer with a small external ear canal of the action diagram sealing type
earplugs, (a) is a perspective view, and (b) is a perspective view venting means when applied to
an action diagram audio device Perspective view of the earplugs
[0017]
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4
Embodiments of the present invention will be described below based on the attached drawings.
As shown in FIG. 1, the earphone 1 of the balance type electromagnetic structure according to
the first embodiment of the present invention has an armature 2, upper and lower plates 3, 4,
upper and lower coils 5, 6, upper and lower magnets 7, 8, upper and lower yokes. The upper and
lower cases 9 and 10 work as a terminal, and a terminal plate 11 and lead wires 12 are also
provided.
[0018]
In the earphone 1, upper and lower plates 3 and 4, upper and lower coils 5 and 6, upper and
lower magnets 7 and 8, upper and lower cases 9 and 10 are arranged symmetrically with respect
to the armature 2.
The external shape of the earphone 1 is not limited, but in the embodiment of the present
invention, it has a substantially cylindrical shape.
[0019]
The armature 2 may be a solid circular flat plate, but may have a shape as shown in FIG. 2, for
example.
The upper and lower plates 3 and 4 and the upper and lower magnets 7 and 8 have circular
shapes, respectively, and the centers of the armature 2 and the upper and lower plates 3 and 4
are provided on the central axis C passing through the centers of the magnets 7 and 8.
[0020]
In addition, the upper and lower cases 9 and 10 sandwich the disc-shaped armature 2 and fix
them by welding or adhesive over the entire circumference.
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By welding or bonding the entire circumference, the joint between the upper and lower cases 9
and 10 and the armature 2 is sealed, so that the earphone 1 can be washed with water.
[0021]
The cylindrical upper and lower plates 3 and 4 are fixed to the armature 2 by spot welding or the
like.
Upper and lower coils 5 and 6 which are air core coils are attached to the upper and lower plates
3 and 4 respectively with an adhesive. An armature portion is constituted by the armature 2, the
upper and lower plates 3 and 4, and the upper and lower coils 5 and 6. The upper and lower
coils 5 and 6 are connected to the lead 12 (not shown) and connected to the terminal plate 11.
The upper and lower coils 5 and 6 can be configured by connecting in parallel or in series.
[0022]
A magnetic material is used as the material of the armature 2. For example, 45-permalloy or the
like is used, and 45-permalloy or the like is also used as the material of the upper and lower
plates 3 and 4 and the upper and lower cases 9 and 10.
[0023]
The upper and lower magnets 7 and 8 have predetermined coercivity and magnetic flux density,
and are made of rare earth magnets such as neodymium-based or samarium-cobalt-based, and
sheet-like, circular magnets are used for miniaturization. The upper and lower magnets 7, 8 are
fixed to the inner surface of the upper and lower cases 9, 10.
[0024]
The upper gap 13 of the upper plate 3 and the upper magnet 7 and the lower gap 14 of the
lower plate 4 and the lower magnet 8 have the same dimensions. When the upper and lower
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magnets 7 and 8 are both magnetized in the same direction, for example, in the upward
direction, upward magnetic lines of force are generated in both the upper and lower gaps 13 and
14.
[0025]
A magnetic attraction force acts between the upper plate 3 and the upper magnet 7 and between
the lower plate 4 and the lower magnet 8. The upper and lower magnetic forces are balanced so
that the static magnetic force acting between the upper plate 3 and the upper magnet 7 almost
does not balance the static magnetic force acting between the lower plate 4 and the lower
magnet 8 when no current flows in the coils 5 and 6 By adjusting the force or gap length, the
balanced magnetic circuit of the earphone 1 is configured.
[0026]
The upper and lower coils 5, 6 may be connected either in parallel or in series, but the direction
of the magnetic lines of force generated in the gaps 13, 14 by the coil current when the current
of a fixed direction flows flows in the upper and lower gaps. Connect in the reverse direction.
[0027]
When driving current is applied to the upper and lower coils 5, 6 of the thus configured
earphone 1, the armature 2 having the upper and lower plates 3, 4 and the upper and lower coils
5, 6 attached is directed upward or downward depending on the direction of the current. The
case side receives the counteracting reaction force and vibrates.
Then, the upper and lower cases 9 and 10 vibrate to vibrate the ear cartilage portion in contact
with the air and the earphone 1 to generate air conduction sound and bone conduction sound.
[0028]
Further, as shown in FIG. 3, the driving force can be increased by reducing the joint surface of
the joint portions 3a and 4a with the armature 2 without changing the area of the surface of the
upper and lower plates 3 and 4 facing the upper and lower magnets 7 and 8. The elastic
displacement range of the armature 2 can be further increased with almost no loss.
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[0029]
The outer peripheral portion of the armature 2 is fixed by the upper and lower cases 9 and 10,
and the central portion is fixed by the upper and lower plates 3 and 4. Therefore, when the
earphone 1 vibrates, an intermediate portion sandwiched between the two fixing portions of the
armature 2 Will be displaced.
Assuming an armature of the same thickness, the elastic displacement range can be increased by
lengthening the middle portion of the armature 2. It is effective to increase the elastic
displacement range of the armature 2 because a displacement of about several tens of μm is
required especially to obtain a high output at a frequency of 1000 Hz or less.
[0030]
Next, as shown in FIG. 4, the earphone 21 according to the second embodiment of the present
invention is a through hole penetrating the upper and lower cases 9 and 10, upper and lower
magnets 7 and 8, upper and lower plates 3 and 4, and armature 2 respectively. A nonmagnetic
tube 23 is disposed with the central axis C at the center 22. The tube 23 is adhered and fixed to
the upper and lower cases 9 and 10, but is not fixed to the armature 2 and the upper and lower
plates 3 and 4 with a gap 19 provided. The other configuration is the same as that of the first
embodiment.
[0031]
By providing such a through hole 22 at the center of the earphone 21, the through hole 22
serves as a vent passing through the external air and the external ear canal, and the earphone 21
can be worn comfortably. Blocking the ear canal, if there is a stagnation of the sound of one's
own voice or an ear leak, will make it worse. The through holes 22 are effective because they
reduce the buildup of sound and the deterioration of ear loss.
[0032]
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Next, as shown in FIG. 5, the ear pin 25 can be attached to the earphone 21 of the behind-the-ear
hearing aid 24. Earplugs 25 are made of silicon. The outer peripheral portion of the earphone 21
is held by the outer peripheral portion 25 b of the ear pin 25. Then, when the ear plugs 25 are
attached to the external ear canal 26, the external ear canal 26 is sealed with the umbrella 25 a
of the ear plugs 25, and the umbrella 25 a is crushed and at least a part of the outer peripheral
portion 25 b of the ear plugs 25 accommodating the earphones 21 is It abuts on the ear canal 26
and holds the earphone 21 in the ear canal 26. By stabilizing the insertion into the ear canal,
changes in the vibration output of the earphone 21 due to the insertion are suppressed. The
vibration generated by the earphone 21 is transmitted to the ear cartilage through the outer
peripheral portion 25 b of the ear plug 25.
[0033]
By holding the earphones 21 in the ear canal 26 through the ear plugs 25, it is possible to
suppress the fluctuation of the vibration output due to the holding condition of the earphones 21
to the ear canal 26. Further, the external ear canal 26 communicates with the outside air through
the through hole 25 c at the center of the ear pin 25 communicating with the through hole 22 of
the earphone 21.
[0034]
A microphone, a signal processing device (DSP), a battery, and the like are stored in the main
body 24a of the behind-the-ear hearing aid 24, but the earphone is not stored. The behind-theear hearing aid 24 outputs a sound signal obtained by converting ambient sound into an
electrical signal with a microphone, and this sound signal is subjected to hearing aid processing
according to the wearer's hearing with a signal processor (DSP), and this hearing aid processing
Output a signal.
[0035]
The main body 24 a and the earphones 21 are electrically connected via the terminal plate 11.
When sound signals output from the main body 24a are supplied to the upper and lower coils 5,
6 of the earphone 21, driving forces in the same direction are generated in the upper and lower
gaps 13, 14, respectively, and vibrate according to the sound signals.
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9
[0036]
The vibration of the upper and lower cases 9 and 10 vibrates the air to generate air conduction
noise, and the vibration of the upper and lower cases 9 and 10 is also transmitted to the cartilage
portion in contact with the earphones 21. If it is a problem that the sound pressure in the low
frequency region is reduced by the through hole 25 c of the ear plug 25, use the closed type
earphone 29 without the through hole shown in FIG. 6 or the through hole The tube can be
inserted and adjusted to block 22 or to reduce the pore size.
[0037]
Further, as shown in FIG. 7, the earplugs 30 are formed so that the earphones 21 can be worn
stably even when the earphones 21 are larger than the ear canal 26. When such earplugs 30 are
attached to the earphone 21 and attached to the ear canal 26, the tip 30 a is held in the ear canal
26, and the earphone 21 is attached to the concha cavity 27.
[0038]
Further, as shown in FIG. 8, the earphone 21 can be used as a general-purpose earphone 31 for
attaching an open-type ear pin 25 and listening to audio, radio and the like.
[0039]
Furthermore, as shown in FIG. 9, if the ear canal 26 is not sealed by using ear plugs 33 provided
with a plurality of grooves 32 as ventilation means in the umbrella portion 33a and the outer
peripheral portion 33b, the through hole 22 is at the center. Even if the provided earphones 21
are used, the external ear canal 26 can be ventilated with ambient air.
[0040]
According to the present invention, the small size, high output, low power consumption, and no
sound opening, there is no possibility of clogging of the earlobe, and further cleaning is possible.
Can be provided.
[0041]
1, 21, 31 ... earphone, 2 ... armature, 3 ... top plate, 3a ... junction, 4 ... bottom plate, 4a ... junction,
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5 ... top coil, 6 ... bottom coil, 7 ... top magnet, 8 ... bottom Magnets 9 upper case 10 lower case
13 upper gap 14 lower gap 19 gap 22 through hole 23 tube 24 ear-hook type hearing aid 24a
main body 25, 29, 30, 33 Earplugs, 25a, 33a: Umbrella, 25b, 33b: Outer peripheral portion, 25c:
Through hole, 26: Ear canal, 27: Ear plate space, 30a: Tip portion, 32: Groove, central axis: C .
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