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JP2004048487

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DESCRIPTION JP2004048487
An object of the present invention is to obtain a thin acoustic device in which a receiver and a
speaker are integrally formed on the front and back, and to improve the sound generation
characteristics. SOLUTION: Of the yoke 7 which is a common component of the receiver 10a and
the speaker 10b, the outer peripheral end portion on the surface side of the yoke 7 which is
likely to generate magnetic saturation, which becomes the magnetic path portion of the speaker
10b, is thicker than other portions. Then, the yoke convex portion 7a is formed. By setting the
upper limit of the height of the yoke convex portion 7a to the height of the receiver vibrating film
1 or the height of the movable range of the receiver vibrating film 1, the thickness of the entire
device is not increased, and the acoustic device 10 can be thin. After that, the magnetic
saturation is reduced to secure the sound pressure of the speaker 10b. [Selected figure] Figure 6
Acoustic device and method of manufacturing the same
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
acoustic apparatus in which two sound producing units of a mounting component for which a
reduction in thickness is required, such as a receiver and a speaker constituting a mobile phone,
are integrally formed. It is. 2. Description of the Related Art In a portable telephone, a device for
producing a conversation of the other party as a telephone is called a so-called receiver, and a
device for producing music or a ringing tone at the time of an incoming call is called a speaker.
In the conventional mobile phone, although the receiver and the speaker have relatively similar
characteristics as an audio device, they are generally mounted as separate parts, which hinders
the miniaturization of the mobile phone. The Therefore, technology for integrating a speaker and
a receiver has been developed. As such an example, in Japanese Patent Application Laid-Open
No. 2002-58094, the sound generation direction is on the front surface side and the rear surface
side of the component, and the receiver and the speaker are respectively arranged and integrated
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on the front and back to make one mounting component. Technology is disclosed. In the abovedescribed conventional configuration, there are many parts in which the magnetic circuits of the
receiver and the speaker are independent of each other, and the speaker and the receiver are
simply stacked and integrated. Because of the closeness to the configuration, there is a problem
that the thickness increases in the axial direction (the same as the sound generation direction) as
compared with the acoustic device of the speaker alone or the receiver alone. For this reason,
although the mounting area can be reduced, thinning has been difficult. In addition, it is also
important to realize a structure capable of further improving productivity and a structure capable
of further improving the sound-production characteristic while enabling the thickness reduction
of the acoustic device. The present invention has been made to solve the above-mentioned
problems, and it is possible to further improve the productivity by using a thin mounting
component in which a receiver and a speaker are integrated. An object of the present invention is
to obtain an acoustic device having a structure and a structure capable of further improving the
sound generation characteristics and a method of manufacturing the same. A sound device
according to the present invention has a first sound producing portion and a second sound
producing portion coaxially disposed on the front and back of the yoke, respectively. A ringshaped clearance which opens upward between the yoke and the yoke located on the outer
peripheral side of the first recess in the circular first recess provided in the center on the front
side of the yoke. A disc-shaped or ring-shaped first magnet arranged at the center of the yoke, a
first top plate covering the top surface of the first magnet, and a ring-shaped gap opened upward
A first coil disposed to secure a movable area in the second region, and a first vibrating film
driven by the first coil, and the second sound producing portion is the yoke and the back side of
the yoke. In the second recess provided on the outer peripheral side, the second A second ringshaped second member disposed in contact with the rear surface side end of the yoke so as to
open a ring-shaped gap opened downward between the recess and the central protrusion of the
yoke located on the inner peripheral side of the recess. A magnet, a second top plate which
covers the lower surface of the second magnet, a second coil arranged to secure a movable area
in the ring-shaped gap opened downward, and the second coil An acoustic device comprising a
second vibrating membrane to be driven, wherein movable ranges of axial directions of the first
and second coils overlap, wherein the first magnet and the second magnet are An acoustic device
characterized in that it is magnetized in the same direction along the axial direction.
Further, according to the sound device of the present invention, in the above-described
configuration, the sound device may have a radial direction perpendicular to the axial direction
of the yoke sandwiched between the first coil and the second coil. The width is equal to or more
than the sum of the thicknesses of the first top plate and the second top plate. The audio
apparatus according to the present invention further includes a first sound producing unit and a
second sound producing unit coaxially disposed on the front and back of the yoke, the first sound
producing unit being the yoke described above; The yoke is formed so as to open a ring-shaped
gap opened upward between the yoke located on the outer peripheral side of the first recess in a
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circular first recess provided at the center on the front side of the yoke. A movable region in the
ring-shaped gap opened in the upper direction, and the first top plate covering the upper surface
of the first magnet and the disk-shaped or ring-shaped first magnet disposed at the center of A
first coil disposed, and a first vibrating membrane driven by the first coil, wherein the second
sound emitting portion is provided on the yoke and an outer peripheral side of the back side of
the yoke. Located on the inner peripheral side of the second recess in the second recess A ringshaped second magnet disposed in contact with the rear surface side end of the yoke so as to
leave a ring-shaped gap opened downward between the central portion protrusion of the yoke
and the second yoke; A second top plate covering the lower surface of the magnet, a second coil
disposed to ensure a movable area in the ring-shaped gap opened downward, and a second
vibration driven by the second coil It is an acoustic device which is constituted by a membrane
and in which the movable ranges in the axial direction of the first and second coils overlap, and a
portion of the yoke located between the first and second coils is a ring. The third magnet is
magnetized in the opposite direction with respect to the first and second magnets which are
constituted by the third magnet and are magnetized in the same direction along the axial
direction. According to another aspect of the present invention, there is provided an audio
apparatus including a first sound producing unit and a second sound producing unit coaxially
disposed on the front and back of the yoke, wherein the first sound producing unit is the yoke;
The yoke is formed so as to open a ring-shaped gap opened upward between the yoke located on
the outer peripheral side of the first recess in a circular first recess provided at the center on the
front side of the yoke. A movable region in the ring-shaped gap opened in the upper direction,
and the first top plate covering the upper surface of the first magnet and the disk-shaped or ringshaped first magnet disposed at the center of A first coil disposed, and a first vibrating film
driven by the first coil and disposed on the yoke, the second sounding portion includes the yoke,
and an outer periphery of the back side of the yoke. In the second recess provided on the side, A
second ring-shaped second member disposed in contact with the rear surface side end of the
yoke so as to open a ring-shaped gap opened downward between the recess and the central
protrusion of the yoke located on the inner peripheral side of the recess. A magnet, a second top
plate which covers the lower surface of the second magnet, a second coil arranged to secure a
movable area in the ring-shaped gap opened downward, and the second coil An acoustic device
comprising a second vibrating membrane to be driven, wherein the movable ranges in the axial
direction of the first and second coils have an overlap, and are positioned outside the outer
peripheral end of the first vibrating membrane The outer peripheral end of the yoke is formed so
as to be raised with the height of the movable range of the first vibrating membrane as the upper
limit.
Furthermore, in addition to the above configuration, the acoustic device according to the present
invention has a portion located at the bottom of a ring-shaped gap opened downward where the
second coil of the yoke is disposed, It is set as the shape further taken from the surface which a
yoke and said 2nd magnet contact | connect, and the movable range of said 2nd coil is expanded.
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Further, according to a method of manufacturing an acoustic device in accordance with the
present invention, a first sound producing unit and a second sound producing unit coaxially
disposed on the front and back of the yoke, respectively, the first sound producing unit described
above A ring-shaped gap, which opens upward, is left between the yoke and the first recess
located in the center of the front side of the yoke and the yoke located on the outer peripheral
side of the first recess. A first magnet disposed at the center of the yoke, a first top plate covering
an upper surface of the first magnet, and a movable region in the ring-shaped gap opened
upward A first coil arranged in a secure manner and a first vibrating membrane driven by the
first coil, the second sound producing portion is provided on the yoke and an outer peripheral
side of the back side of the yoke. The inner periphery of the second recess in the second recess A
ring-shaped second magnet disposed in contact with the rear surface side end of the yoke so as
to open a ring-shaped gap which opens downward between the central portion protruding
portion of the yoke located in A second top plate covering the lower surface of the second
magnet, a second coil disposed to secure a movable area in the ring-shaped gap opened
downward, and a second driven by the second coil A method of manufacturing an acoustic
device, wherein the first magnet and the second magnet are disposed on the yoke. After being
attached, they are simultaneously magnetized so as to be magnetized in the same direction along
the axial direction. DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIG. 1
is a cross-sectional view showing the main part of an acoustic device according to a first
embodiment of the present invention. In the figure, reference numeral 10 denotes a receiver
(first sound producing part) 10a on the surface of the component and a speaker (second It shows
the whole of a thin-type acoustic device in which the sound producing unit 10b is disposed and
integrated, and the respective constituent parts constituting the acoustic device 10 are disposed
concentrically about the center line. In the figure, 1 is a receiver diaphragm (first diaphragm), 2
is a coil on the receiver 10a side (first coil), 3 is a speaker diaphragm (second diaphragm), 4 is a
coil on the speaker 10b ( Second coil), 5 is a disk-like magnet (first magnet), 6 is a top plate
arranged to cover the upper surface of the magnet 5, 7 is a substantially disk-like yoke (magnetic
circuit), 8 is a ring The magnet 9 and the top plate 9 are arranged to cover the lower surface of
the magnet 8 respectively.
In addition, although the magnet 5 gives the example of a disk shape, it may be formed in a ring
shape. More specifically, the acoustic device 10 has a receiver 10 a and a speaker 10 b coaxially
disposed on the front and back of the yoke 7 as a common part. The receiver 10a is a ring that
opens upward between the yoke 7 and the circular first recess 71 provided in the center on the
front side of the yoke 7 and the yoke located on the outer peripheral side of the first recess 71. A
disk-shaped magnet 5 disposed at the center of the yoke 7 and a disk-shaped (a shape according
to the shape of the magnet) disposed on the upper surface of the magnet 5 are formed to open
the gap. Of the top plate 6 in contact with the upper end of the coil 2 so as to be driven by the
coil 2 arranged to secure the movable region in the ring-shaped gap opened upward, and the top
plate 6 of It covers the upper surface while maintaining the distance to the upper surface, and
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further extends from the upper end of coil 2 to the outer peripheral side, and is provided so as to
contact the outer peripheral surface of first recess 71 of yoke 7 The receiver diaphragm 1 is
formed. The speaker 10 b, which is another sound producing unit, is located inside the yoke 7
and the second recess 72 provided on the outer periphery of the back side of the yoke 7. A ringshaped magnet 8 disposed in contact with the rear surface side end of the yoke 7 and a lower
surface of the magnet 8 so as to leave a ring-shaped gap opened downward with the central
portion protruding portion 73 of the yoke 7 A ring-shaped top plate 9, a coil 4 arranged to
secure a movable area in a ring-shaped gap opened downward, and a lower end of the coil 4 so
as to be driven by the coil 4 The speaker diaphragm 3 is provided so as to cover the surface in a
state of maintaining the distance from the central portion protruding portion 73 and further
spread to the outer peripheral side of the coil 4 and to be in contact with the surface of the top
plate 9. It is composed of Furthermore, as shown in the cross-sectional view of the acoustic
device 10 in FIG. 2, the magnet 5 is magnetized along the axial direction as indicated by the
reference numeral 12 (magnetization direction 12), and the magnet 8 is also the same. In the
axial direction (the same direction as the magnetization direction 12 in the axial direction).
Reference numerals 13 and 14 in the figure indicate magnetic flux lines passing through the coils
2 and 4, respectively. Also, although the two coils 2 and 4 have a structure that vibrates with
sound generation, the movable range in the axial direction has a region overlapping each other,
and compared with the structure in which the receiver and the speaker are simply laminated, The
axial dimension of the device 10 as a whole can be reduced (thinned).
As shown in FIG. 1, in the present configuration, there are two ring-shaped gaps for arranging
the coils because there are two coils in the acoustic device 10, and the amount of magnetic flux is
increased if the magnet cross-sectional area is not sufficiently secured. It can not be maintained.
Therefore, it is desirable to provide two or more magnets. Next, the configuration of the magnetic
circuit of the acoustic device 10 will be described. A magnetic circuit for driving the coil 2 is
configured as indicated by a magnetic flux line 13, and a magnetic flux generated from a diskshaped or ring-shaped magnet 5 magnetized along an axial direction provided on the inner
peripheral side of the coil 2 Is bent in a radial direction perpendicular to the axial direction by
the top plate 6 provided on the magnet 5, and is vertically linked to the coil 2, and the yoke 7
which is a common magnetic circuit of the receiver 10a and the speaker 10b is It becomes a
circuit which returns to the magnet 5 via the. The magnetic circuit for driving the coil 4 is
configured as indicated by the magnetic flux line 14, and the magnetic flux generated from the
cylindrical axially magnetized magnet 8 provided on the outer peripheral side of the coil 4 is the
magnet 8. The coil is radially bent by the top plate 9 provided at the lower part of the lower part,
and is linked to the coil 4 to return to the magnet 8 through the yoke 7. According to this
configuration, since the coil 2 and the coil 4 are coaxially arranged, and in a positional
relationship with each other in the axial direction, a part of the movable range of the coils 2 and
4 overlaps, so the receiver 10a Even when the speaker 10b is integrated, the thickness of the
entire mounting component can be configured substantially the same as a single component of a
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conventional receiver or speaker. As materials for each component, magnets 5 and 8 are rare
earth magnets, for example, anisotropic neodymium, yoke 7 is iron or iron as a main magnetic
material, and vibration film is PET (polyethylene terephthalate). Can. Further, a method of
manufacturing the acoustic device 10 will be described. If it is a procedure to assemble top plates
6 and 9 and yoke 7 of other members temporarily after magnetizing magnets 5 and 8,
adsorption of parts between parts at the time of assembly and suction of cutting powder etc.
occur and mass productivity is extremely high. descend. Therefore, in order to obtain an acoustic
device 10 for magnetizing the two magnets 5 and 8 in the same direction as shown in FIG. 2, the
acoustic device 10 is firstly used by using the magnets 5 and 8 which are not magnetized. By
manufacturing in the procedure of assembling and then magnetizing, handling of the parts
becomes easy, and problems such as sticking of cutting powder before assembly can be avoided.
In order to magnetize the magnets 5 and 8 after assembling the acoustic device 10, if
magnetization directions of the magnets 5 and 8 are the same, it is possible to magnetize simply
by creating a uniform magnetic field. The magnetizing device may be simple, and since
assembling is performed using the unmagnetized magnets 5 and 8, mass productivity can be
improved.
FIG. 3 shows a process chart showing the state of magnetization. In the figure, reference numeral
20 denotes a cylindrical coil constituting a magnetizing device, 21 denotes a yoke made of a
magnetic material for enhancing the magnetic flux of the coil 20, such as iron, and 22 denotes
schematically a magnetic field generated by the magnetizing device. Is represented by. By
arranging the acoustic device 10 assembled with the magnets 5 and 8 in the unmagnetized state
near the yoke 21 and energizing the coil 20, the magnets 5 and 8 are magnetized by the
generated magnetic field 22. The magnets 5 and 8 are magnetized in the same direction as the
axis by aligning the direction of the magnetic field 22 with the axial direction. Although FIG. 3
shows the case where there is one acoustic device 10 to be magnetized in one magnetization
process, if a large yoke and coil are prepared, a plurality of unmagnetized states are
simultaneously obtained. It goes without saying that the acoustic device 10 can also be
magnetized. Also, the axial direction can be magnetized in any direction of the axial direction of
the acoustic device 10, and in the magnetizing step, when the acoustic device 10 which is not
magnetized is disposed as shown in FIG. It is possible to magnetize in any direction by arranging
the 10a side up or down. Furthermore, in the case of the present example where the magnetic
flux lines 13 and 14 by two coils share the yoke 7 to be the magnetic circuit, the yoke width
between the coils indicated by reference numeral 11 in FIG. Since the two magnetic fluxes of the
magnet 5 and the magnet 8 pass through in the radial direction magnetic path width
corresponding to the above, the radial direction magnetic path width 11 is equal to or more than
the sum of the thicknesses of the top plates 6 and 9, respectively. It can be prevented that the
formation of the magnetic path is hindered. In most cases, the top plates 6 and 9 are formed to
have the same thickness, so that by setting the radial direction magnetic path width 11 at least
twice the thickness of the top plate, it is possible to alleviate the occurrence of magnetic
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saturation. You can secure the quantity. In addition, the upper limit of the radial direction
magnetic path width 11 is set to a degree that does not prevent the reduction in the size of the
acoustic device 10 in the radial direction. Specifically, since the top plates 6 and 9 respectively
constituting the receiver 10 a and the speaker 10 b of the mobile phone have a thickness of
about 0.3 to 0.4 mm, the radial direction magnetic path width 11 is 0.6 -0.8mm or more. By
adjusting the radial direction magnetic path width 11 in this manner, even if the magnetization
directions of the magnets 5 and 8 are the same, the acoustic device 10 does not saturate the
magnetic circuit with emphasis on the assemblability. The sound pressure is not sacrificed
because the amount of magnetic flux linked to the coils 2 and 4 can be secured with the
minimum required mounting area without unnecessarily increasing the diameter of the device. .
Second Embodiment In the acoustic device 10 in which the receiver 10a and the speaker 10b are
integrated as shown in FIG. 1 or FIG. 2 of the first embodiment described above, the outer
diameter of the magnet 8 may be reduced to minimize the outer diameter. Desired. However, if
the magnet 8 is downsized, the amount of magnetic flux linked to the speaker 10 b can not be
sufficiently secured, and the sound pressure on the speaker 10 b side is insufficient. So, in this
Embodiment 2, the structure of the acoustic device 16 which can make the outer diameter of the
whole apparatus as small as possible is proposed next, without making the sound pressure by the
side of the speaker 10b into sacrifice. FIG. 4 is a cross-sectional view showing an acoustic device
16 according to a second embodiment of the present invention, in which reference numeral 8a
denotes the magnetization direction of the ring-shaped magnet 8 disposed at the outer peripheral
end of the back surface side of the yoke 7 by arrows. The direction is the same as the
magnetization direction of the magnet 5 disposed at the center on the surface side of the yoke 7.
A ring-shaped magnet (third magnet) 15 is disposed in place of the portion corresponding to the
radial direction magnetic path width 11 of the yoke 7 in FIG. The reference numeral 15a
indicates the magnetizing direction of the magnet 15, and the direction is opposite to that of the
magnets 5 and 8. As shown in FIG. 4, the magnet 15 is disposed at a position to be a common
magnetic path portion of the yoke 7 and the magnetizing direction 15a is made opposite to the
magnets 5 and 8 so that the magnet 15 is a magnet Both the magnetic paths of 5 and 8 can be in
the bias direction, and the magnetic flux amount is reduced even if the thickness of the magnets
5 and 8 is reduced by compensating the magnetic flux amount, or if the outer diameter of the
magnet 8 is reduced. It is possible to reduce the outer diameter or to reduce the thickness of the
magnet without reducing the sound pressure. However, since the magnetization direction 15a of
the magnet 15 is different from that of the magnets 5 and 8 and is the opposite direction, after
assembling the magnet in the unmagnetized state as described in the first embodiment described
above, It becomes difficult to magnetize in a uniform magnetic field. Third Embodiment As in the
first embodiment described above, when the acoustic device 10 in which the receiver 10 a and
the speaker 10 b are integrated is formed, the yoke 7 has a magnetic path cross-sectional area to
pass the magnetic flux to the inner peripheral side of the magnet 8. The smaller the size, the
more likely magnetic saturation occurs. As indicated by reference numeral 30 (magnetically
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saturated portion) in FIG. 5, the portion of the yoke 7 located above the ring-shaped gap in which
the coil 4 is disposed, that is, the inner peripheral side of the magnet 8 of the magnetic path
portion of the speaker 10b. Especially, the magnetic saturation is remarkable in the part of.
When magnetic saturation occurs, a leakage flux is generated as shown by an arrow 31 in FIG. 5,
and the radial component of the magnetic flux linked to the coil 4 is insufficient, and the sound
pressure can not be secured. Will occur.
Therefore, an acoustic device which does not cause the magnetic saturation portion 30 is
proposed next. FIG. 6 is a cross-sectional view showing an acoustic device 32 according to a third
embodiment of the present invention, and in the figure, reference numeral 7a is a projecting
portion (yoke convex portion) provided at the outer peripheral end of the surface side of the yoke
7. The portion of the yoke convex portion 7a located on the outer side than the outer peripheral
end of the receiver diaphragm 1 of the yoke 7 is formed with the upper limit up to the highest
position of the movable range of the receiver diaphragm 1 as the upper limit. It is. If the entire
yoke 7 is formed thick, there is a drawback that the thickness of the entire acoustic device is
increased. However, in the yoke 7, a portion where magnetic saturation tends to occur on the
outer peripheral side of the receiver vibrating film 1 (magnetic saturated portion When only the
thickness 30) is made thicker than the other portions, it is possible to utilize an axial space
necessary for disposing the receiver diaphragm 1 originally secured or to be the movable range
thereof. As described above, according to the third embodiment, by providing the yoke convex
portion 7a, the effect of reducing the magnetic saturation and securing the sound pressure of the
speaker 10b can be obtained after thinning the acoustic device. In the third embodiment, the
magnetizing directions of the magnets 5 and 8 constituting the acoustic device 32 are the same
as those described in the first embodiment, in the same direction along the axial direction. In the
case where the magnet 15 is disposed as in the second embodiment, the magnets 5 and 8 may be
magnetized in opposite directions along the axial direction. If the magnets 5 and 8 are
magnetized in opposite directions along the axial direction, flux lines 13 and 14 as shown in FIG.
2 do not occur. For example, the magnetic circuit is a magnet 5-top plate 6-coil 2-yoke 7-magnet
8-top plate 9-coil 4-yoke 7-magnet 5 are drawn in order. Fourth Embodiment In the third
embodiment described above, the technology for improving the saturation of the magnetic circuit
by partially thickening the outer peripheral end of the yoke 7 and forming the yoke convex
portion 7a has been described. In the fourth embodiment, an example will be described in which
the sound generation characteristics of the bass region of the speaker 10b of the acoustic device
32 shown in the third embodiment are improved. FIG. 7 is a cross-sectional view of the acoustic
device 32 according to the fourth embodiment. In the figure, reference numeral 7b is a yoke
recess formed to widen the movable range when the coil 4 makes a stroke, and the yoke recess
7b is The coil 4 of the yoke 7 is formed in a portion located at the bottom of a ring-shaped gap
opened downward and is further rounded from the surface where the yoke 7 and the coil 4 are in
contact with each other.
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As shown in FIG. 7, by providing the yoke recess 7 b having a shape in which a part of the yoke 7
is excavated, the coil 4 and the yoke 7 serving as a magnetic circuit are obtained even when the
coil 4 makes a large stroke. Contact can be avoided. At this time, as described in the third
embodiment, since the yoke convex portion 7a is provided in advance in the yoke 7 to make the
magnetic circuit sufficiently large, magnetic saturation occurs even if the yoke concave portion
7b is formed. There is no. Therefore, there is no chattering noise or the like due to the contact
between the coil 4 and the yoke 7 in the case of producing the low range large volume, and the
loudness of the speaker can be achieved. Also in this case, as described in the third embodiment,
the height of the outer peripheral end of the yoke 7 on the receiver 10 a side is increased by the
height of the yoke convex portion 7 a, but the receiver vibration originally secured The height of
the yoke convex portion 7 a does not affect the overall thickness of the acoustic device 32 for
disposing the film 1 or utilizing the axial space required for the receiver vibrating film 1 to
vibrate. Therefore, it is possible to secure the volume of the bass of the speaker 10 b without
increasing the overall axial thickness of the acoustic device 32. Although FIG. 7 shows an
example in which the cross-sectional shape of the yoke recess 7b is semicircular, it may be
formed to have another shape such as V-shaped. In addition, the yoke concave portion 7b may be
formed by boring the corresponding portion after molding the yoke 7, or may be formed in
advance as a mold. Although the techniques in the first to fourth embodiments described above
are described as aiming at thinning the acoustic device when integrating the speaker and the
receiver for the mobile phone, the high sound and the low sound are also divided. By applying to
an acoustic device such as a surface mount type 2 WAY speaker, or an automobile speaker, a
portable information device, etc., in which integration and thinning of two sound producing parts
having different characteristics are simultaneously required, Similar effects can be obtained. As
described above, according to the sound apparatus of the present invention, the sound producing
unit has the first sound producing unit and the second sound producing unit coaxially disposed
on the front and back of the yoke, respectively. The first sound emitting portion is opened
upward between the yoke and the circular yoke provided at the center on the front side of the
yoke and the yoke located on the outer peripheral side of the first recess. A disk-shaped or ringshaped first magnet disposed at the center of the yoke, a first top plate covering the top surface
of the first magnet, and a ring opened upward so as to open a ring-shaped gap And a first
vibrating membrane driven by the first coil, and the second sounding portion includes the yoke
and the yoke. In the second recess on the outer side of the back of the A ring-shaped member
disposed in contact with the rear surface side end of the yoke so as to leave a ring-shaped gap
opening downward between the second recess and the central protrusion of the yoke positioned
on the inner peripheral side of the second recess. A second magnet, a second top plate covering
the lower surface of the second magnet, a second coil arranged to secure a movable area in the
ring-shaped gap opened downward, and the second coil An acoustic device comprising a second
vibrating membrane driven by a coil of claim 1, wherein the movable ranges in the axial direction
of the first and second coils overlap, the first magnet and the second magnet. Since the magnet is
magnetized in the same direction along the axial direction, it is possible to maintain and improve
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the sound generation characteristics of the respective sound generating parts while suppressing
the thickness and mounting area as mounted parts to be small. Sound device can be obtained.
Furthermore, according to the acoustic device of the present invention, in addition to the effects
as described above, the diameter perpendicular to the axial direction of the yoke sandwiched
between the first coil and the second coil Since the width of the direction is equal to or more than
the sum of the thicknesses of the first top plate and the second top plate, the occurrence of
magnetic saturation in the yoke is alleviated, and the amount of magnetic flux can be secured.
The sounding characteristics of the respective sounding units can be improved. Further,
according to the sound device of the present invention, it has a first sound producing unit and a
second sound producing unit coaxially disposed on the front and back of the yoke, and the first
sound producing unit includes the above-mentioned yoke and The ring-shaped gap opened
upward between the yoke located on the outer peripheral side of the first recess is opened in the
circular first recess provided in the center on the front side of the yoke. A movable region is
secured in a disk-shaped or ring-shaped first magnet disposed at the center of the yoke, a first
top plate covering the upper surface of the first magnet, and a ring-shaped gap opened upward.
And the first vibrating membrane driven by the first coil, and the second sound producing
portion is provided on the yoke and the outer periphery of the back side of the yoke. Located on
the inner circumferential side of the second recess in the second recess A ring-shaped second
magnet disposed in contact with the rear surface side end of the yoke so as to open a ring-shaped
gap opened downward between the central portion protrusion of the yoke and the second
magnet A second top plate covering the lower surface of the second coil, a second coil disposed
to secure a movable area in the ring-shaped gap opened downward, and a second vibrating film
driven by the second coil An acoustic device in which the movable ranges in the axial direction of
the first and second coils overlap, and a portion of the yoke located between the first and second
coils is ring-shaped. The third magnet is magnetized in the opposite direction with respect to the
first and second magnets which are constituted by the third magnet and magnetized in the same
direction along the axial direction, Reduce the thickness of the magnet that makes up the
acoustic device, or Be such as fence, it is possible to maintain the sound pressure of each sound
unit. Further, according to the sound device of the present invention, the yoke has a first sound
producing unit and a second sound producing unit coaxially disposed on the front and back of
the yoke, and the first sound producing unit includes the yoke and The ring-shaped gap opened
upward between the yoke located on the outer peripheral side of the first recess is opened in the
circular first recess provided in the center on the front side of the yoke. A movable region is
secured in a disk-shaped or ring-shaped first magnet disposed at the center of the yoke, a first
top plate covering the upper surface of the first magnet, and a ring-shaped gap opened upward.
And a first vibrating membrane driven by the first coil and disposed on the yoke, and the second
sound producing portion is the yoke and the back side of the yoke. In the second recess provided
on the outer peripheral side, the second A second ring-shaped second member disposed in
contact with the rear surface side end of the yoke so as to open a ring-shaped gap which opens
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downward between the central portion protruding portion of the yoke positioned on the inner
peripheral side of the recess; Magnet, a second top plate for covering the lower surface of the
second magnet, a second coil arranged to secure a movable area in the ring-shaped gap opened
downward, and the second coil An acoustic device comprising a second vibrating membrane
driven by the first and second coils, wherein the movable ranges in the axial direction of the first
and second coils have an overlap, and are positioned outside the outer peripheral end of the first
vibrating membrane Since the outer peripheral end of the above-mentioned yoke is formed with
the upper limit of the height of the movable range of the above-mentioned first vibrating
membrane as the upper limit, it is possible to make the acoustic device thinner and reduce the
magnetic saturation. The sound pressure of the second sound producing unit can be secured.
Further, according to the acoustic device of the present invention, in addition to the effects as
described above, a portion located at the bottom of the ring-shaped gap opened downward and in
which the second coil of the yoke is disposed, The second sounding is performed without
increasing the thickness of the acoustic device since the second coil has a wider movable range
since the second coil has a movable shape, which is further rounded from the contact surface
between the yoke and the second magnet. It is possible to secure the volume of the bass of the
part. Further, according to the method of manufacturing an acoustic device of the present
invention, the first sound producing unit and the second sound producing unit are provided
coaxially on the front and back of the yoke, respectively. A ring-shaped gap, which opens upward,
is left between the yoke and a circular first recess provided in the center on the front side of the
yoke and the yoke located on the outer peripheral side of the first recess. A disk-shaped or ringshaped first magnet disposed at the center of the yoke, a first top plate covering the upper
surface of the first magnet, and a movable region within the ring-shaped gap opened upward And
the first vibrating membrane driven by the first coil, and the second sounding portion is on the
yoke and the outer periphery of the back side of the yoke. In the second recess provided, the
inner circumferential side of the second recess A ring-shaped second magnet disposed in contact
with the rear surface side end of the yoke so as to open a ring-shaped gap which opens
downward between the central portion protruding portion of the yoke located in A second top
plate covering the lower surface of the second magnet, a second coil disposed to secure a
movable area in the ring-shaped gap opened downward, and a second driven by the second coil A
method of manufacturing an acoustic device, wherein the first magnet and the second magnet
are disposed on the yoke. After being attached, they are simultaneously magnetized so as to be
magnetized in the same direction along the axial direction, so handling of parts when assembling
the first and second magnets in the unmagnetized state is easy And impurities such as cutting
powder may stick before assembly It is possible to improve productivity because there is no.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of an acoustic device
according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view for
explaining the operation of the acoustic device of the first embodiment of the present invention.
FIG. 3 is a process diagram showing a magnetizing step of the acoustic device of the embodiment
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1 in accordance with the present invention; FIG. 4 is a cross-sectional view showing an acoustic
device according to a second embodiment of the present invention.
FIG. 5 is a cross-sectional view necessary for describing an acoustic device according to a third
embodiment of the present invention. FIG. 6 is a cross-sectional view showing an acoustic device
according to a third embodiment of the present invention. FIG. 7 is a cross-sectional view
showing an acoustic device of a fourth embodiment of the present invention. Explanation of code
1 Receiver diaphragm 2, 4 and 20 coils 3 Speaker diaphragm 5, 8 and 15 magnets 6, 9 top plate
7 and 21 yoke 7a yoke convex section 7b yoke concave section 8a, 12 and 15a magnetization
direction 10 , 16, 32 acoustic device 10a receiver 10b speaker 11 radial direction magnetic path
width 13, 14 magnetic flux line 22 magnetic field 30 magnetic saturation portion 31 leakage flux
71 first recess 72 second recess 73 central protrusion.
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