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JP2006050410

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DESCRIPTION JP2006050410
PROBLEM TO BE SOLVED: To provide a technique capable of automatically determining the
positional relationship between a yoke and a voice coil in an electroacoustic transducer.
SOLUTION: A frame portion 121 supporting a diaphragm 124 has a cylindrical structure, and a
projecting portion 126 having a convex cross section is formed inside thereof. On the other hand,
the outer diameter of the yoke 115 is made smaller than the outer diameter of the magnet 111
constituting the magnetic drive system unit 110 to form a step structure 117. When the
projecting portion 126 is combined with the step structure 117, when the magnetic drive system
unit 110 is inserted into the frame unit 120 and combined, relative positional adjustment of both
is automatically performed. Thus, the positional relationship between the yoke 113 and the voice
coil 125 can be automatically determined. [Selected figure] Figure 1
Electro-acoustic transducer and method of manufacturing the same
[0001]
The present invention relates to an electroacoustic transducer mounted on a cellular phone or
the like, and relates to a configuration that is advantageous for downsizing, low in cost, and
excellent in productivity.
[0002]
A mobile phone or the like includes an electroacoustic transducer for outputting voice
information.
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In general, the electroacoustic transducer is called a speaker or a receiver and has a function of
converting an electrical signal into an acoustic signal (sound wave).
[0003]
The reduction in size and weight of mobile phones and the reduction in price thereof are
remarkable, and accordingly, the reduction in size and weight and cost reduction of the
electroacoustic transducer are required. A structure described in Patent Document 1 is known as
an electroacoustic transducer having a structure for reducing the size and the assembly cost.
[0004]
Patent Document 1 describes a configuration in which an integrated magnetic circuit system is
formed separately from a vibration system, and the assembly can be simplified by joining the
two.
[0005]
Japanese Utility Model Application Publication No. Sho 63-23897
[0006]
In order to reduce the manufacturing cost, it is important to eliminate installation of parts at
difficult angles and alignment of parts with one another, and to minimize work procedures as
much as possible.
For example, an electro-acoustic transducer such as that mounted on a mobile phone is pursued
to have a thin structure, but in a structure pursuing thin, a structure in which assembly is
completed by stacking components in order It is preferable to
This is because, in the assembly in the small and thin structure, the overall thickness is reduced,
which makes it difficult to arrange the components in three dimensions.
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[0007]
In this regard, the technique described in Patent Document 1 has a point to be improved. An
object of the present invention is to provide a thin electroacoustic transducer which is easy to
assemble.
[0008]
An electro-acoustic transducer according to the present invention comprises: a magnetic drive
system unit including a base, a magnet disposed on the base, and a yoke disposed on the magnet;
a voice coil; and the voice coil And a frame unit having a cylindrical structure with one end
opened, and a peripheral edge portion of the yoke portion and a peripheral edge portion of the
magnet. A step structure is formed by utilizing it, and a projecting part having a convex cross
section is formed inside the cylinder structure of the frame unit, and the magnetic drive system
unit is opened inside the cylinder structure of the frame unit. The position of the magnetic drive
system unit with respect to the frame unit is inserted from the end, and the step portion is
pressed against the projecting portion. Characterized in that it is determined.
[0009]
According to this structure, the projecting portion, which is protruded to the inside of the frame
unit of the cylindrical structure, is fitted to the stepped portion formed by the edge of the yoke
and the edge of the magnet, thereby the magnetic vibration unit and the frame unit Both can be
combined in the state of alignment.
[0010]
That is, in this configuration, the step portion provided in the magnetic vibration system unit and
the projecting portion inside the frame unit can be used as alignment means for the magnetic
vibration system unit and the frame unit.
According to this structure, the relative positional relationship between the magnetic drive
system unit and the frame unit can be determined only by inserting the magnetic drive system
unit into the inside of the frame unit of the cylinder structure.
Therefore, it is possible to secure the quality while simplifying the manufacturing process, and to
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realize low cost without lowering the quality.
[0011]
In the electro-acoustic transducer of the present invention, the yoke portion is preferably fixed to
the magnet by welding. For example, by utilizing a welding method using a laser beam, it is
possible to obtain a structure having no useless projections and the like in a planar structure.
[0012]
In the electro-acoustic transducer of the present invention, a step structure is formed utilizing the
peripheral edge portion of the base portion and the peripheral edge portion of the magnet, and a
groove portion formed of the inner side surface of the frame structure and the step structure.
Preferably, an adhesive member is filled in the magnetic drive system unit and the frame unit is
adhered and fixed by the adhesive member.
[0013]
According to this configuration, it is possible to fix the magnetic vibration system unit to the
frame unit by pouring a material having an adhesive function such as an adhesive or a brazing
material into the groove and developing the adhesive force.
In this structure, since the adhesive member is accommodated in the groove, it is possible to
avoid the disadvantage that an extra bump or the like is formed on the surface. When the whole
is configured thin, the rise of the adhesive may be an obstacle when the electroacoustic
transducer is incorporated into an electronic device (for example, a mobile phone) as an
electronic component. According to the above aspect, occurrence of such an inconvenience is
prevented. In addition, since the bonding area can be secured inside the groove without forming
a bonding layer which is disadvantageous for thinning, adhesion can be secured while seeking
thinning.
[0014]
The present invention can also be grasped as a method of manufacturing an electroacoustic
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transducer. That is, the method of assembling an electroacoustic transducer according to the
present invention comprises: (1) a magnetic drive system unit including a base portion, a magnet
disposed on the base portion, and a yoke portion disposed on the magnet The process of
manufacturing, (2) a voice coil, a diaphragm to which the voice coil is fixed, and a frame portion
supporting the diaphragm, and a process of manufacturing a frame unit having a cylindrical
structure with one end opened. And (3) an assembling step of inserting the magnetic drive
system unit into the cylindrical structure of the frame unit from the open end thereof, using the
peripheral edge portion of the yoke portion and the peripheral edge portion of the magnet A step
structure is formed, and a projecting portion having a convex cross section is formed inside the
cylindrical structure of the frame unit, and in the assembling step, the projecting portion is
formed. By pressing the difference portion to the overhanging portion, characterized in that the
position of the magnetic drive system unit to said frame unit is determined.
[0015]
According to the method of manufacturing the electro-acoustic transducer, by inserting the
magnetic drive system unit into the frame unit having a cylindrical structure, the step portion of
the magnetic drive system unit comes in contact with the projecting portion inside the frame
unit, The relative alignment between the drive system unit and the frame unit is performed
automatically. Therefore, the position of the voice coil can be accurately determined
simultaneously with the assembly.
[0016]
According to the present invention, when assembling the electro-acoustic transducer, both can be
automatically aligned by inserting the magnetic drive system unit into the frame unit of the
tubular structure holding the diaphragm. Therefore, it is possible to obtain a thin electroacoustic
transducer which is easy to assemble.
[0017]
In particular, when the present invention is used, the voice coil position can be accurately
secured while having a structure that can be easily assembled. Therefore, variations in
performance can be achieved while pursuing thinning, downsizing, weight reduction and
reduction in the number of parts. Can be obtained.
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[0018]
Configuration of Embodiment FIG. 1 is a cross-sectional view showing a cross-sectional structure
of an electroacoustic transducer utilizing the present invention.
Fig.1 (a) shows a completion state, and FIG.1 (b)-(d) shows each structural unit.
[0019]
The electroacoustic transducer 101 shown in FIG. 1 (a) is composed of three units as shown in
FIGS. 1 (b) to 1 (d). That is, the electroacoustic transducer 101 is configured by the magnetic
drive system unit 110 shown in FIG. 1 (d), the frame unit 120 shown in FIG. 1 (c), and the
protective case 130 shown in FIG. 1 (b).
[0020]
FIG. 2 is a perspective view showing the appearance of the magnetic drive system unit 110. As
shown in FIG. As shown in FIG. 1 (d) and FIG. 2, the magnetic drive system unit 110 is composed
of a magnet (permanent magnet) 111, a base portion 112 and a yoke 113. In addition, it is FIG.1
(d) which showed the appearance of the cross section cut by A-A 'of FIG.
[0021]
The magnetic drive system unit 110 is provided with a step structure 143 by being set in a
dimensional relationship in which the outer peripheral edge 142 of the magnet 111 is located
outside the outer peripheral edge 141 of the base 112. Due to the presence of the step structure
143, when the magnetic drive system unit 110 is inserted into the opening 122 of the frame unit
120, a recess (groove) is formed in a portion indicated by reference numeral 102 in FIG. .
[0022]
The groove portion is filled with an adhesive, and the adhesive force is expressed, whereby the
magnetic drive system unit 110 and the frame unit 120 can be integrated.
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[0023]
The magnet 111 generates a magnetic field in the gap 114 via the base portion 112 and the yoke
113.
As described later, when the voice coil is positioned in the gap 114 and a signal current flows in
the voice coil, an interaction occurs with the magnetic field applied from the magnet 111 to the
gap 114, and the voice coil is moved in its axial direction according to the signal current. To
vibrate.
[0024]
Further, the dimension is selected so that the outer peripheral edge portion 116 of the magnet
111 is positioned outside the outer peripheral edge portion 115 of the yoke 113 of the ring
structure (ring structure), and the step structure 117 is formed.
[0025]
FIG. 3 is a perspective view showing the appearance of the frame unit 120. As shown in FIG.
It is sectional drawing of FIG.1 (c) which looked up the cross section which inverted the state
shown in FIG. 3 up and down, and was further cut by B-B '. (The position of diaphragm 124 is
upside down in FIG. 3 and FIG. 1 (c))
[0026]
In the frame unit 120, one end 122 of the cylindrical frame portion 121 is opened, and the
diaphragm 124 is fixed to the other end of the cylindrical frame portion 121. A thin metal plate
123 for adjusting acoustic characteristics is attached to the central portion of the diaphragm
124, and a voice coil 125 is fixed to the back surface thereof. The vibrating plate 124 vibrates
relative to the frame portion 121 via the movable portion 127 (see FIG. 1) to generate a sound
wave.
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[0027]
Further, as shown in FIG. 3, from the voice coil 125, the wires 201 and 202 are drawn out from
the winding start and the winding end, and are connected to the terminal electrodes 203 and
204, respectively.
[0028]
Inside the cylindrical frame portion 121, a projecting portion 126 having a convex cross section
is formed.
The overhanging portion 126 is a bowl-like or bowl-like protrusion extending in the
circumferential direction of the inner surface of the cylindrical structure formed integrally with
the frame portion 121. As shown in FIG. 3, the projecting portions 126 having a convex cross
section are formed at two places inside the frame portion 121.
[0029]
The protective case 130 is a member for protecting the diaphragm 124, and several openings
(not shown) are formed. When the diaphragm 124 vibrates, sound waves are emitted from this
opening.
[0030]
The inner diameter of the overhanging portion 126 of the frame unit 120 is dimensioned to
match the step structure 117 of the magnetic drive system unit 110. As a result, the edge of the
projecting portion 126 comes into contact with the step structure 117, and a structure in which
the positional relationship between the frame unit 120 and the magnetic drive system unit 110 is
determined is realized.
[0031]
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In the embodiment shown in FIGS. 1 to 3, the inner diameter of the projecting portion 126 is
matched with the diameter of the step structure 117 (see FIG. 2) having a circumferential
structure so that the step structure 117 fits and fits inside the projecting portion 126. There is.
Thus, when the magnetic drive unit 110 is inserted into the frame unit 120, the relative
positional relationship between the two can be determined automatically.
[0032]
As described above, since the magnetic drive system unit 110 has a structure in which the
magnet 111, the base portion 112, and the yoke 113 are integrated in advance, the magnetic
drive system unit 110 can be obtained simply by inserting the magnetic drive system unit 110
into the frame unit 120. Can be positioned and fixed to the frame unit 120. In addition, since the
magnet 111 can be abutted against the projecting part 126, the thickness can be reduced
compared to the case where the yoke 113 is abutted against the frame unit 120 in the insertion
direction.
[0033]
(Manufacturing method of embodiment) First, the manufacturing method of magnetic drive
system unit 110 is explained. First, a magnet (permanent magnet) 111 having an annular
structure (ring structure) is prepared. Then, a yoke 113 made of magnetic metal having an
annular structure is fixed to one surface of the magnet 111 by laser welding. Further, on the
other surface of the magnet 111, a base portion 112 made of magnetic metal having an annular
structure of L-shaped cross section is fixed by laser welding. Thus, the magnetic drive system
unit 110 shown in FIG. 1D and FIG. 2 is obtained.
[0034]
Fixation of members by laser welding is performed by irradiating a part of the members with a
laser and partially melting the vicinity of the interface between the members to be joined to
perform welding. It can do welding. Since the electro-acoustic transducer shown in the present
embodiment has a small and thin structure to be attached to a mobile phone, laser welding is
used in manufacturing a laminated structure such as the magnetic drive unit 110 to form
irregularities on the surface. It is preferable not to do so.
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[0035]
Next, the frame unit 120 is manufactured. First, a frame portion 121 having a thin cylindrical
structure, in which the projecting portion 126 is integrally formed on the inner surface of the
cylindrical structure, is manufactured. The frame portion 121 is made of plastic and
manufactured using a molding method.
[0036]
Next, a film-like plastic material to be used as a diaphragm is prepared, and a thin metal plate
123 is adhered to one side thereof, and a voice coil 125 is adhered to the other side. Thus, the
diaphragm 124 is obtained and bonded to one open portion of the frame portion 121 so as to be
closed. Thus, the frame unit 120 shown in FIG. 1 (c) and FIG. 3 is obtained.
[0037]
Next, the magnetic drive system unit 110 is inserted into the open portion 122 of the frame unit
120. This operation can be understood as an operation of inverting the magnetic drive system
unit 110 shown in FIG. 2 up and down and inserting it into the opening 122 of the frame unit
120 having a cylindrical structure.
[0038]
At this time, the step structure 117 contacts the projecting portion 126 and the arc-shaped edge
of the projecting portion 126 contacts the step structure 117 so that the relative positional
relationship between the magnetic drive system unit 110 and the frame unit 120 is automatic. It
depends on you. That is, the positional relationship of the voice coil 125 in the gap 114 can be
determined simultaneously with assembly.
[0039]
Once the magnetic drive system unit 110 is inserted into the opening 122 of the frame unit 120,
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the groove (recess) formed in the portion indicated by reference numeral 102 in FIG. 1 is filled
with an adhesive, and the adhesive is cured. The system unit 110 and the frame unit 120 are
integrated.
[0040]
As described above, by filling the groove with the adhesive and bonding the magnetic drive
system unit 110 and the frame unit 120, the adhesive does not bulge from the base portion 112
when the frame unit 120 is adhered. It is possible to realize a structure in which no extra step or
protrusion is formed.
This structure has the advantage of not interfering with the thin structure.
[0041]
After the magnetic drive system unit 110 and the frame unit 120 are integrated, a metal
protective case 130 is covered to complete the electroacoustic transducer 101 whose crosssectional structure is shown in FIG. 1 (a).
[0042]
Alternatively, the magnetic drive system unit 110 may be incorporated into the frame unit 120
after the protective case 130 is put on the frame unit 120.
[0043]
(Operation of Embodiment) When driving signals are supplied to the terminal electrodes 203 and
204 shown in FIG. 2 in the assembled state shown in FIG. 1, a signal current flows in the voice
coil 125 and the magnetic field generated by the magnet 111 In operation, the voice coil 125
vibrates in its axial direction according to Fleming's left-hand rule.
This vibration vibrates the diaphragm 124 to generate a sound wave.
[0044]
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The present invention can be used for an electroacoustic transducer mounted on a small
electronic device such as a mobile phone.
[0045]
It is sectional drawing which shows the outline | summary of the electroacoustic transducer
which utilized invention.
It is a perspective view which shows the outline | summary of the magnetic drive system unit
which comprises the electroacoustic transducer which utilized invention.
It is a perspective view which shows the outline | summary of the frame unit which comprises
the electroacoustic transducer which utilized invention.
Explanation of sign
[0046]
101: electro-acoustic transducer, 102: groove portion filled with adhesive, 111: magnet, 112:
base portion, 113: yoke, 114: gap, 115: outer peripheral edge of yoke 113, 116: outside of
magnet 111 Peripheral portion 117 step structure 120 frame unit 121 frame portion 122 open
end of frame portion 121 thin metal plate 124 diaphragm 125 voice coil 126 convex cross
section Extension portion 127 movable portion 130 protective case 141 outer peripheral portion
of base portion 142 outer peripheral portion of magnet 111 143 step structure 201 wiring 202
wiring 203 terminal electrode , 204 ... terminal electrode.
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