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JP2006128925

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DESCRIPTION JP2006128925
PROBLEM TO BE SOLVED: To provide a structure capable of fixing an electrode member to a
frame with high reliability without increasing the manufacturing cost in a speaker unit.
SOLUTION: A pair of electrode members 3, 3 are attached to both ends of a frame 21 made of
synthetic resin, and each electrode member 3 is made of sheet metal, and a pinched portion 23
provided at an end of the frame 21 A clamping portion 31 having a U-shaped cross section to be
clamped and fixed to the clamping portion 23 and a strip-shaped elastic arm portion 32
extending from the clamping portion 31 along the back surface of the frame 21 are provided.
The holding portion 31 of the electrode member 3 is a pair of locking pieces that face both
surfaces of the held portion 23 of the frame 21 and protrude toward the held portion 23 at
positions where the held portion 23 is sandwiched. 33 and 34 are formed, and a pair of concave
portions 24 and 25 to be engaged with the pair of locking pieces 33 and 34 are formed on both
surfaces of the held portion 23 of the frame 21. [Selected figure] Figure 8
スピーカユニット
[0001]
The present invention relates to a speaker unit incorporated in a small electronic device such as a
mobile phone and a digital camera.
[0002]
Conventionally, as a speaker unit of this type, a disk-shaped one using a circular diaphragm has
been the mainstream (see Patent Document 1), but in recent years, an elliptical or track-shaped
diaphragm having an aspect ratio of more than 1 A track type speaker unit using the above has
been developed (see Patent Document 2).
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[0003]
For example, in the track type speaker unit (4) shown in FIGS. 16 to 20, a diaphragm (6) having
an aspect ratio exceeding 1 as shown in FIGS. 16 and 17 in the internal space of the synthetic
resin frame (41). And a driving mechanism (7) such as a coil (71) for driving the diaphragm (6),
and both ends in the longitudinal direction of the frame (41) have sound emitting surfaces (40)
as shown in FIG. A pair of air holes (42) (42) are opened in the back of the opposite side.
Each air hole (42) is covered by a mesh sheet (8).
[0004]
Further, as shown in FIGS. 18 to 20, at both end portions in the longitudinal direction of the
frame (41), there are a pair of electrode members (5, 5) for supplying power to the coil (71) from
the outside. It is attached at a position near the mesh sheet (8) covering the pair of air holes (42)
(42).
Each electrode member (5) is made of sheet metal and holds an end portion of the frame (41)
and holds a U-shaped holding portion (51) to be fixed to the end portion; and the holding portion
(51) And an elastic arm (52) extending obliquely to the back of the frame (41).
[0005]
FIG. 21 shows the process of attaching each electrode member (5) to the frame (41). As shown in
the drawing, the clamped portions (43) are respectively provided at both end portions in the
longitudinal direction of the frame (41), and any one of the three inner wall surfaces forming the
clamping portion (51) of the electrode member (5). After applying an adhesive to the surface, the
holding portion (51) is fitted to the held portion (43) of the frame (41). As a result, the electrode
member (5) is adhered and fixed to the frame (41) in a state where the holding portion (51) of
the electrode member (5) holds the held portion (43) of the frame (41). .
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[0006]
Thereafter, the pair of conducting wires (not shown) drawn from the coil (71) of the drive
mechanism (7) shown in FIG. 17 is soldered to the sandwiching portion (51) of the electrode
member (5), respectively. Complete the assembly). In the process of incorporating the speaker
unit (4) thus assembled into an electronic device such as a portable telephone, as shown in FIG.
15, the sound emission opening (13 of the case half 1 constituting one of the cases) After the
speaker unit (4) is installed facing the above, the case half (1) and the other case half (11) are
joined to each other with the circuit board (12) in between. As a result, the electrode member (5)
of the speaker unit (4) is pressed into contact with a pad (not shown) formed on the surface of
the circuit board (12), and the space between the circuit board (12) and the speaker unit (4)
Electrical connection is made. In this state, the elastic arm (52) of the electrode member (5) is
elastically deformed as shown in FIG. 22, and the elastic return force maintains the pressure
contact of the elastic arm (52) against the pad. JP, 2004-48223, A JP, 2000-350286, A
[0007]
However, in the conventional speaker unit (4), in the sandwiching portion (51) of the electrode
member (5) fixed to the frame (41) by the adhesive, the lead wire extending from the coil (71) of
the drive mechanism (7) In the soldering process, the heat generated by the soldering is
transmitted to the adhesive to soften the adhesive, which causes the electrode member (5) to be
detached from the frame (41). In addition, since the bonding strength of the adhesive varies,
there is a problem that a certain reliability can not be secured. In order to solve this problem, a
method is conceivable in which the electrode member (5) is integrated with the frame (41) by
insert molding, but there is a problem that the mold becomes expensive and the manufacturing
cost increases.
[0008]
SUMMARY OF THE INVENTION An object of the present invention is to provide a structure
capable of highly reliably fixing an electrode member to a frame in a speaker unit without
increasing the manufacturing cost.
[0009]
In the speaker unit according to the present invention, a diaphragm (6) and a drive mechanism
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(7) for driving the diaphragm (6) are provided in the internal space of the frame (21) made of
synthetic resin. A pair of electrode members (3) and (3) for supplying electric power to the drive
mechanism (7) is attached to both ends of.
Each electrode member (3) is made of sheet metal, and has a U-shaped cross section to be held
by the pinched portion (23) provided at the end of the frame (21) and fixed to the pinched
portion (23) And an elastic arm (32) in the form of a strip extending along the back of the frame
(21) from the sandwiching portion (31). The sandwiching portion (31) of the electrode member
(3) faces both surfaces of the sandwiching portion (23) of the frame (21) and sandwiches the
sandwiching portion (23) at offset positions. A pair of locking pieces (33) and (34) projecting
toward (23) are formed, and the pair of locking pieces (33) are formed on both sides of the
clamped portion (23) of the frame (21). A pair of recesses (24), (25) to be engaged by (34) are
formed.
[0010]
In the specific configuration, the pair of locking pieces (33) and (34) of the electrode member (3)
is provided to protrude on both side edges of the U-shaped portion forming the sandwiching
portion (31).
[0011]
In the speaker unit according to the present invention, in the state where each electrode member
(3) is attached to the frame (21), the sandwiching portion (31) of the electrode member (3) is the
pinched portion (23) of the frame (21) Electrode member by engaging the pair of locking pieces
(33) and (34) provided in the holding portion (31) with the pair of recesses (24) and (25) of the
frame (21). (3) is fixed to the frame (21) with almost no rattling.
Therefore, it is not necessary to fix the electrode member (3) to the frame (21) by the adhesive as
in the prior art, and as a result, the adhesive is used when soldering the lead wire extending from
the drive mechanism (7) to the electrode member (3) However, this can solve the problem that
the electrode member (3) is softened and the electrode member (3) comes off, thereby obtaining
high reliability.
[0012]
If necessary, an adhesive is applied to one of the contact surfaces of the sandwiching portion (31)
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of the electrode member (3) and the frame (21) to apply the electrode member (3) to the frame
(21). It is also possible to temporarily fix, whereby the electrode member (3) is attached
completely to the frame (21) without rattling, so the lead wire extending from the drive
mechanism (7) The work of soldering to (3) becomes easy.
[0013]
According to the speaker unit of the present invention, the electrode member (3) is made of sheet
metal and it is easy to project the pair of locking pieces (33) and (34) in the holding portion (31).
21) is made of synthetic resin and it is easy to form a pair of recesses (24) (25), so that the
electrode member (3) can be highly reliable in the frame (21) without increasing the
manufacturing cost. Can be attached.
[0014]
Hereinafter, embodiments of the present invention will be specifically described with reference to
the drawings.
As shown in FIGS. 4 and 5, the speaker unit (2) according to the present invention is made of a
synthetic resin and has a flat, substantially rectangular frame (21) elongated in one direction, and
the length of the frame (21) A pair of sheet metal electrode members (3) and (3) are attached to
both end portions in the direction to constitute a track type speaker unit having a sound emission
surface (20) of 11 mm × 20 mm.
[0015]
In the internal space of the frame (21), as shown in FIGS. 2 and 3, a drive mechanism (7) such as
a diaphragm (6) having an aspect ratio of more than 1 and a coil (71) for driving the diaphragm
(6). And at both ends in the longitudinal direction of the frame (21), as shown in FIG. 3, there are
a pair of air holes (22) and (22) opening on the back side opposite to the sound emitting surface
(20). It has been established.
Each air hole (22) is covered by a mesh sheet (8).
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[0016]
The electrode member (3) is, as shown in FIGS. 10 and 11, a holding portion (31) having a Ushaped cross section, and a strip-like elastic arm portion projecting in one direction from one end
of the holding portion (31). 32), and both sides of the U-shaped part of the holding part (31)
project in L-shape at diagonal positions which are mutually contradictory to each other, and the
tip thereof is directed to the inside of the holding part (31) A first locking piece (33) and a
second locking piece (34) to be bent are formed.
[0017]
The electrode member (3) is manufactured through the steps of cutting the spring plate into the
shape shown in FIG. 12 and the step of plastically working into the shapes of FIGS. 10 and 11 by
a press.
As shown in FIG. 12, the first locking piece (33) and the second locking piece (34) are provided
in a diagonal position of the clamping portion (31) in the unfolded state, and both locking pieces
(33) ( The tips of 34) extend in a direction approaching each other to form an L shape. As
described above, since the first locking piece (33) and the second locking piece (34) are provided
at the diagonal positions of the holding portion (31) in the unfolded state, no trouble occurs in
the cutting process.
[0018]
On the other hand, as shown in FIGS. 8 and 9 (a) and (b), both sides of the frame (21) in the
longitudinal direction are to be held by the holding portion (31) of the electrode member (3) A
part (23) is formed. The to-be-held portion (23) is a to-be-held portion facing the sound emitting
surface (20) side of the frame (21) front surface area (23a), and the to-be-held portion facing the
opposite side to the sound emitting surface (20) And a back surface area (26) having a back
surface area (26) is slightly (about 0. 0.) as compared with the main body back surface area (27)
in which the air holes (22) are opened as shown in FIG. 20 mm) is formed high, and a slight level
difference is provided between the pinched part rear face area (26) and the main body part rear
face area (27).
[0019]
In addition, the recessed portion to be engaged with the first locking piece (33) of the electrode
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member (3) at the inward end portion of the frame (21) in the clamped area rear surface area
(26) of the frame (21) (24) is formed, and the second locking piece (34) of the electrode member
(3) is formed at the outer end of the frame (21) in the clamped portion front surface area (23a) of
the frame (21). A recess (25) with which it engages.
[0020]
As shown in FIG. 8, in the step of attaching each electrode member (3) to each pinched portion
(23) of the frame (21), the three inner wall surfaces constituting the pinched portion (31) of the
electrode member (3). After applying the adhesive on any one side, with the posture that the
elastic arm (32) covers the back of the frame (21), the holding part (31) is directed to the
supported part (23) of the frame (21). Press and fit.
As a result, the inner wall surface of the nipping portion (31) of the electrode member (3) is in
close contact with the front portion area (23a) and the rear portion area (26) of the frame (21). )
And the first locking piece (33) and the second locking piece (34) of the holding portion (31)
respectively engage with the recessed portions (24) (25) of the frame (21) . FIG. 13 shows the
engaged state between the second locking piece (34) of the electrode member (3) and the recess
(25) of the frame (21).
[0021]
In this state, the holding portions (31) of each electrode member (3) are restrained by the guide
surfaces (21a) and (21b) of the frame (21) formed on both sides as shown in FIGS. Movement of
the electrode member (3) in the width direction is restrained, and the tips of the first locking
piece (33) and the second locking piece (34) are recessed portions (24) and (25) of the frame
(21) The inner surface is received to prevent the electrode member (3) from being removed.
Thus, the electrode member (3) is attached to the frame (21) without rattling, and the elastic arm
(32) is provided with the mesh sheet (8) covering the air hole (22) of the frame (21). It will be
extended diagonally oppositely.
[0022]
Thereafter, the pair of conducting wires (not shown) drawn from the coil (71) of the drive
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mechanism (7) shown in FIG. 3 is soldered to the sandwiching portion (31) of the electrode
member (3), respectively. Complete the assembly). In soldering, since the electrode member (3) is
temporarily fixed to the frame (21) at the sandwiching portion (31) by the adhesive to prevent
backlash, the soldering operation is easy.
[0023]
In the process of incorporating the thus assembled speaker unit (2) into an electronic device such
as a portable telephone, as shown in FIG. After the speaker unit (2) is installed facing the above,
the case half (1) and the other case half (11) are joined to each other with the circuit board (12)
interposed therebetween. As a result, the electrode member (5) of the speaker unit (2) is pressed
against the pad (not shown) formed on the surface of the circuit board (12), and the space
between the circuit board (12) and the speaker unit (2) Electrical connection is made. In this
state, the elastic arm (32) of the electrode member (3) is elastically deformed as shown in FIG.
14, and the elastic return force maintains the pressure contact of the elastic arm (32) against the
pad.
[0024]
According to the speaker unit (2) of the present invention described above, the first engagement
engaged with the sandwiching portion (31) of the electrode member (3) in a state where each
electrode member (3) is attached to the frame (21) State that the locking piece (33) and the
second locking piece (34) engage with the pair of recesses (24) (25) of the frame (21), and the
electrode member (3) does not rattle the frame (21) It is not necessary to fix the electrode
member (3) to the frame (21) with an adhesive as in the prior art. In addition, since a locking
structure in which two locking pieces (33) and (34) are disposed at diagonal positions of the
holding portion (31) of the electrode member (3) is adopted, a single locking piece can be used.
As compared with the locking structure described above, not only the electrode member (3) is
not easily removed, but the posture of the electrode member (3) becomes stable. Therefore, there
is no problem that the electrode member (3) is detached as in the prior art when soldering the
conducting wire extending from the coil (71) of the drive mechanism (7) to the electrode member
(3). High reliability can be obtained in the mounting state.
[0025]
In addition, since the first locking piece (33) and the second locking piece (34) of the electrode
member (3) are provided so as to protrude on both side edges of the U-shaped portion forming
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the holding portion (31), Lead wire (not shown) is soldered to the clamping part (31) compared
to the case where both locking pieces (33) and (34) are formed by cutting and raising the central
position of the U-shaped part of the clamping part (31). A large heating area can be taken during
this process, which can prevent the occurrence of soldering defects.
[0026]
The electrode member (3) is made of sheet metal and it is easy to project a pair of locking pieces
(33) and (34) in the holding part (31), and the frame (21) is made of synthetic resin Since it is
easy to form the pair of recesses 24 and 25, the implementation of the present invention does
not increase the manufacturing cost.
[0027]
Further, in a state in which the speaker unit (2) is incorporated into an electronic device such as
a mobile phone, the elastic arm (32) of the electrode member (3) has a posture substantially
parallel to the back surface area (27) of the main body of the frame (21). When it is elastically
deformed to the maximum, the elastic arm portion (32) approaches the back surface area (27) of
the main body portion of the frame (21), but as shown in FIG. 9B, the pinched portion of the
frame (21) Since the above-mentioned step is formed between the back surface area (26) and the
main body back surface area (27), the elastic arm (32) and the main body back surface area (27)
A gap corresponding to the level difference is secured, whereby the air hole (22) of the frame
(21) is maintained in a largely open state.
As a result, the flow of air accompanying the ringing of the speaker unit can be well maintained,
and the desired low-range acoustic characteristics can be obtained.
[0028]
It is sectional drawing which shows the process of incorporating the speaker unit which concerns
on this invention in the housing ¦ casing of an electronic device.
It is sectional drawing of the direction in alignment with the short axis of this speaker unit. It is
sectional drawing of the direction in alignment with the long axis of this speaker unit. It is the
perspective view which looked at this speaker unit from the sound emission side. It is the
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perspective view which looked at this speaker unit from the back side. It is the expansion
perspective view which looked at this speaker unit from the back side. It is a rear view of this
speaker unit. It is a figure explaining the process of attaching an electrode member to the flame ¦
frame of this speaker unit, Comprising: The plan view of the flame ¦ frame seen from the sound
emission surface side and the right side from the back side on the left It is a figure showing a side
view. It is a perspective view which shows the principal part of a flame ¦ frame. It is an expansion
perspective view of an electrode member. It is the expansion perspective view which looked at an
electrode member from another direction. It is an expanded plan view of an electrode member. It
is a figure explaining the engagement state of a flame ¦ frame and an electrode member. It is a
figure explaining the elastic deformation state of an electrode member. It is sectional drawing
which shows the process of incorporating the conventional speaker unit in the housing ¦ casing
of an electronic device. It is sectional drawing of the direction in alignment with the short axis of
this speaker unit. It is sectional drawing of the direction in alignment with the long axis of this
speaker unit. It is the perspective view which looked at this speaker unit from the sound emission
side. It is the perspective view which looked at this speaker unit from the back side. It is the
perspective view which looked at this speaker unit from another direction. It is a figure
explaining the process of attaching an electrode member to the flame ¦ frame of this speaker
unit, Comprising: The plan view of the flame ¦ frame seen from the sound emission surface side
and the right side from the back side on the left It is a figure showing a side view. It is a figure
explaining the elastic deformation state of an electrode member.
Explanation of sign
[0029]
(1) Case half (11) Case half (12) Circuit board (2) Speaker unit (21) Frame (22) Air hole (23)
Clamped portion (24) Recess (25) Recess (26) Clamped Back surface area (27) Back surface area
of main body (3) Electrode member (31) Clamping section (32) Elastic arm (33) First locking
piece (34) Second locking piece (6) Diaphragm (7) Drive mechanism (71) Coil (8) Mesh sheet
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