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JP2008035055

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DESCRIPTION JP2008035055
PROBLEM TO BE SOLVED: To reduce the volume of a diaphragm rear space S surrounded by a
vibrating portion of a vibrating member, a voice coil and a top plate, and discharge air by using a
small-sized and thin conductive type speaker used for a mobile phone etc. As a result, the air
pressure in the rear portion of the vibrating membrane S resists the amplitude operation of the
vibrating portion and interferes with the acoustic effect. SOLUTION: A magnetic circuit
comprising a permanent magnet, a yoke fixed to one magnetic pole side of the permanent
magnet, a top plate fixed to the other magnetic pole side, a vibrating part, an edge damper part
formed around the vibrating part In a conductive type speaker having a vibrating member
comprising a flat portion for holding a coil formed between the vibrating portion and the edge
damper portion, and a voice coil fixed to the flat portion, the flat portion of the vibrating member
has a back surface By forming a plurality of spacer portions projecting to the side and fixing the
voice coil via the spacer portions, an air gap is provided between the flat portion where the
spacer portion does not exist and the voice coil to make a vent. [Selected figure] Figure 1
Conductive speaker
[0001]
BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a
conductive speaker, and more particularly to a structure for forming a vent hole in a vibrating
member.
[0002]
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1
2. Description of the Related Art In recent years, thin-shaped, high-performance, conductive
speakers have been widely adopted as acoustic devices in portable devices such as mobile
phones.
The conductive speaker includes a cone speaker and a dome speaker, and a dome speaker is
often used for portable equipment that needs to be miniaturized. The reason is that the dome
speaker has a dome shape in which the shape of the vibrating portion is substantially spherical
and the voice coil is provided on the outer peripheral portion of the vibrating portion. This is
because a relatively large driving force can be obtained even if the diameter of the aperture is
small. For the above reasons, there has been proposed a conductive speaker having a dome
speaker structure conventionally used for a mobile phone or the like (see, for example, Patent
Document 1). ) Will be described below with reference to the drawings.
[0003]
FIG. 11 is a cross-sectional view of a conventional conductive speaker. In FIG. 11, reference
numeral 50 denotes a conductive speaker, and reference numeral 1 denotes an annular frame,
which includes a vibrating member fixing portion 1a and a yoke fixing portion 1b. A yoke 2 made
of a magnetic material is fixed to the yoke fixing portion 1b of the frame 1 by an adhesive.
Reference numeral 3 denotes a disk-shaped permanent magnet having magnetic poles on the
upper and lower surfaces, and is fixed to the center of the bottom of the yoke 2. A disc-like top
plate 4 is fixed on the upper surface side of the permanent magnet 3. A magnetic circuit is
formed through an air gap G between the upper end of the yoke 2 sandwiching the permanent
magnet 3 and the peripheral edge of the top plate 4.
[0004]
Reference numeral 5 denotes a vibrating member formed of a resin sheet, a substantially
spherical vibrating portion 5a at the center, a flat portion 5b at the outer peripheral portion of
the vibrating portion 5a, an edge damper portion 5c at the outer peripheral portion of the flat
portion 5b, and the edge damper portion A fixing portion 5d is provided on the outer peripheral
portion of 5c, and is integrally formed of the resin sheet. The vibrating member 5 is held by
adhering and fixing the fixing portion 5 d to the vibrating member fixing portion 1 a of the frame
1. A voice coil 6 is an air core coil, and its base is adhered and fixed to the flat portion 5b of the
vibrating member 5, and its tip end is a magnetic gap G between the upper end of the yoke 2 and
the peripheral portion of the top plate 4. Is inserted in the
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2
[0005]
12 is a plan view showing the back surface side of the vibrating member 5 shown in FIG. 11, and
FIG. 13 is a sectional view taken along the line A-A of the vibrating member 5 shown in FIG. 12
and 13, the vibrating portion 5a is circular and spherically provided at the central portion of the
vibrating member 5, and a flat portion 5b of a width to which the voice coil 6 can be bonded is
formed on the outer peripheral portion. Further, an edge damper portion 5c for determining the
stiffness as a vibrating member is provided on the outer peripheral portion in a ring shape in a
spherical shape. Further, a fixing portion 5d is provided at the outermost periphery, and the flat
portion 5b and the fixing portion 5d have substantially the same height. Denoted at 7 is a lead
wire of the voice coil 6, and after securing the lead portion 7a by adhesion to the flat portion 5b
for stabilization, the back surface side of the edge damper portion 5c is rolled and taken out as
an external terminal 7b from one place of the fixing portion 5d. . Further, in FIG. 13, the voice
coil 6 adhesively fixed to the flat portion 5b is shown by a dotted line so that the height
relationship can be understood.
[0006]
FIG. 14 is an enlarged cross-sectional view of a portion X of the conductive speaker 50 shown in
FIG. A voice coil 6 bonded and fixed by applying an adhesive 8 to the entire periphery of the flat
portion 5b of the vibrating member 5 is inserted into the gap G of the magnetic circuit formed by
the yoke 2, the permanent magnet 3 and the top plate 4. ing.
[0007]
JP 2001-169389 A
[0008]
However, the conventional conductive speaker has the following problems.
In general, vibration system mass Mo, magnetic force B, effective coil length L, current I are the
main factors for determining the sound pressure which is the output of the conductive speaker,
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and the sound pressure = A × B × L × I / ( It is expressed by So × Mo). (A is a unique constant
of each speaker, and So is a resistance value of the voice coil. However, due to the demand for
smaller and thinner mobile phones, the conventional conductive speaker as shown in FIG. 11 has
a diameter 15 of 15 mm or less and a thickness t of 3 mm or less as the size when incorporated
into a mobile phone. It is desired. However, this size has a problem that desired characteristics
can not be secured, and in order to improve the characteristics, the amplitude of the vibrating
member is secured, the weight of the voice coil is reduced, and the voice coil and magnetic flux in
the air gap of the magnetic circuit It is necessary to secure a sufficient amount of intersection
with the
[0009]
Furthermore, in a small dome speaker structure such as a conductive speaker 50 incorporated in
a mobile phone, as shown in FIG. 11, it is surrounded by the vibrating portion 5a of the vibrating
member 5, the voice coil 6 surrounding the periphery, and the top surface of the top plate 4. The
volume of the vibrating membrane rear space S becomes small. Since the air pressure in the rear
space S of the diaphragm acts as a resistance to the amplitude operation of the vibrating portion
5a when the conductive speaker 50 is driven, the air pressure is released to the outside at the
amplitude operation of the vibrating portion 5a. It is necessary to However, as shown in FIG. 11
and FIG. 14, since only a narrow space passing through the air gap G formed around the voice
coil 6 and the top plate 4 exists as a vent for releasing air from the vibrating membrane rear
space S Only a small amount of air flow Pa passing through the vent can be discharged. As a
result, the air pressure in the rear portion of the vibrating membrane S does not decrease, and
the amplitude of the vibrating portion 5a is disturbed to reduce the acoustic effect. Although the
problem of air pressure in the diaphragm rear space S does not become a problem when the
volume of the diaphragm rear space S is sufficiently large as in a large-sized conductive speaker,
This becomes a problem when the volume of the diaphragm rear space S can not be increased
due to the small and thin structure.
[0010]
It is an object of the present invention to secure a vent from the diaphragm rear space S to
enable sufficient air flow discharge without changing the basic configuration as a conductive
speaker, and to provide a conductive speaker with good acoustic efficiency. To provide.
[0011]
The configuration of the present invention for achieving the above object comprises: a
permanent magnet; a yoke fixed to one magnetic pole side of the permanent magnet; a magnetic
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circuit comprising a top plate fixed to the other magnetic pole side; In a conductive type speaker,
the vibrating member includes an edge damper portion formed around the periphery, a vibrating
member including a flat portion for holding a coil formed between the vibrating portion and the
edge damper portion, and a voice coil fixed to the flat portion. Forming a plurality of spacers
projecting to the back side on the flat part of the vibrating member, and fixing the voice coil via
the spacer to form a gap between the flat part where the spacer does not exist and the voice coil
It is a conductive type speaker characterized in that it is provided.
[0012]
According to the above configuration, the air in the rear portion of the vibrating membrane S is
sufficiently discharged from the air gap provided between the flat portion where the spacer
portion does not exist in the vibrating member and the voice coil, thereby preventing the
vibration of the vibrating portion 5a. There is no sound, and good sound effects can be obtained.
[0013]
The spacer portion is a projection formed integrally with the vibrating member.
[0014]
The vibration member is a resin sheet, and the spacer portion is a protrusion integrally formed
on the resin sheet.
[0015]
According to the above configuration, the formation of the projection can be easily performed by
integral molding on the vibrating member made of the resin sheet.
[0016]
The conductive speaker is characterized in that a reinforcing resin is filled in the inside of the
spacer portion.
[0017]
According to the above configuration, the small-area protrusion formed by integral molding of
the resin sheet can be reinforced, and the reliability with respect to the bonding and driving
operation of the voice coil can be improved.
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[0018]
The spacer unit is a spacer member fixed to a flat portion of the vibrating member.
[0019]
The fixing of the vibrating member and the voice coil is performed by adhesively fixing the
adhesive by an adhesive applied between two spacer portions in the flat portion.
[0020]
According to the above configuration, the application of the adhesive to the flat portion can be
uniformly performed with the two spacer portions as the guide portion, and the voice coil can be
positioned on the spacer portion, so that the voice coil Positional accuracy and adhesive strength
are improved.
[0021]
The conductive speaker is characterized in that the lead-out portion of the lead-out wire of the
voice coil is bonded to a portion of the flat portion where the spacer portion does not exist.
[0022]
According to the above configuration, since the lead-out portion of the lead-out wire can be
adhered and fixed to the flat portion where the voice coil does not exist, adhesion of the lead-out
wire becomes easy.
[0023]
As described above, the conductive type speaker according to the present invention can
sufficiently discharge the air in the rear portion S of the vibrating membrane by simply forming
the spacer portion by performing simple processing on the vibrating member, thereby vibrating
the vibrating portion 5a. Can be unhindered and good acoustic effects can be obtained.
[0024]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings.
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1 to 6 show a conductive speaker according to a first embodiment of the present invention, FIG.
1 is a sectional view of the conductive speaker, and FIG. 2 is a plan view showing the back side of
the vibrating member shown in FIG. 3 is a cross-sectional view of the vibrating member shown in
FIG. 2 taken along the line A-A, and FIG. 6 is a cross-sectional view of the vibrating member
shown in FIG.
4 is an enlarged cross-sectional view of the X1 portion of the conductive speaker shown in FIG. 1,
and FIG. 5 is an enlarged cross-sectional view of the X2 portion of the conductive speaker shown
in FIG.
The conductive type loudspeakers shown in FIGS. 1 to 6 correspond to the conductive type
loudspeakers in the conventional example shown in FIGS. 11 to 14, and the same elements are
denoted by the same reference numerals and redundant description will be omitted.
[0025]
In the cross-sectional view of FIG. 1 and the plan view of FIG. 2, 10 is a conductive speaker, and
the difference from the conductive speaker 50 shown in FIG. 11 is that the vibrating member 5 is
changed to the vibrating member 15.
However, in the vibrating member 15, the vibrating portion 15a, the edge damper portion 15c,
and the fixing portion 15d are the same as the vibrating member 5, and the difference is that the
spacer portion 16 projecting to the back side is formed at the position of the flat portion 15b.
The voice coil 6 is fixed to the
[0026]
The differences from the conventional example will be described in detail with reference to the
drawings.
2 and 3 differ from the conventional vibrating member 5 in that a plurality of spacer portions
16a, 16b... (12 pieces in this embodiment) are projected to the back side at the flat portion 15b
of the vibrating member 15. The voice coil 6 is fixed to the spacer portion 16.
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As a result, as shown in FIG. 3, an air gap 17 is formed between the flat portion 15b where the
spacer portion 16 does not exist and the bottom surface of the voice coil 6, and the air passage
17 in the diaphragm rear space S passes as described later. It functions as a pore.
[0027]
1 shows an AA cross section of the vibrating member 15 shown in FIG. 2, X1 in FIG. 1 shows a
cross section of the spacer portion 16 in the vibrating member 15, and X2 shows a spacer
portion in the vibrating member 15. The cross section of the flat part 15b which 16 does not
exist is shown.
The flow of air in the vibrating membrane rear space S in the present invention will be described
below with reference to FIGS. 4 and 5.
4 is an enlarged cross-sectional view of the X1 portion in the conductive speaker 10 shown in
FIG. 1, FIG. 5 is an enlarged cross-sectional view of the X2 portion in the conductive speaker 10
shown in FIG. As in the prior art shown in FIG. 14, there is only a narrow space passing through
the air gap G formed around the voice coil 6 and the top plate 4 as the air vent in the vibrating
membrane rear space S in this portion. Therefore, only a small amount of air flow Pa can be
discharged through this narrow vent.
[0028]
On the other hand, FIG. 5 shows a cross section of the flat portion 15b in which the spacer
portion 16 does not exist, and the air vent in the vibrating membrane rear space S in this portion
is narrow through the air gap G as in FIG. In addition to the vents, a wide vent is formed through
the air gap 17.
As a result, in addition to the small amount of air flow Pa, the exhaust of air in the vibrating
membrane rear space S is performed by the large amount of air flow Pb passing through the
wide vent of the air gap 17.
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Moreover, as shown in FIG. 2, since the area of the flat portion 15b having a large discharge
amount is sufficiently large as compared with the spacer portion having a small discharge
amount as the shape of the vibrating member 15, the gap 17 formed in the flat portion 15b The
air pressure in the vibrating membrane rear space S can be reduced by sufficient discharge of the
[0029]
Further, as shown in FIG. 2, the lead-out wire 7 of the voice coil 6 is drawn by providing the leadout portion 7a in a portion where the projection-shaped spacer portion 16 of the flat portion 15b
does not exist.
For this reason, since the lead-out portion 7a of the lead-out wire 7 can be bonded and fixed to
the flat portion 15 where the voice coil 6 does not exist, bonding and lead-out processing of the
lead-out wire 7 become easy.
[0030]
6 is a cross-sectional view taken along the line B-B in FIG. 2, and shows a cross-section at the
position of the flat portion 15b where the spacer portion 16 of the vibrating member 15 is
present.
That is, the voice coil 6 shown by a dotted line in FIG. 6 is adhesively fixed to 12 spacer portions
16 formed on the flat portion 15 b of the vibrating member 15.
Therefore, in the portion where the voice coil 6 is not adhesively fixed to the twelve spacer
portions 16, twelve gaps 17 equal in number to the spacer portions 16 are provided between the
bottom surface of the voice coil 6 and the flat portion 15 b of the vibrating member 15. It is
formed.
[0031]
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In the conductive speaker using the vibrating member 15 in the first embodiment, the gap 17 is
formed between the bottom surface of the voice coil 6 and the flat portion 15 b of the vibrating
member 15 by forming the spacer portion with a plurality of protrusions. By being formed, the
flow of air accompanying the vibration of the vibrating portion 15a is improved, and the acoustic
characteristics are improved.
Further, by reducing the bonding area of the vibrating member 15 and the voice coil 6, the
bonding accuracy is improved, and by reducing the amount of adhesive, it is possible to reduce
the weight and material cost.
[0032]
Next, a conductive speaker according to a second embodiment of the present invention will be
described with reference to FIGS. 7 and 8. 7 is a plan view showing the back surface side of the
vibrating member, and FIG. 8 is a cross-sectional view of the vibrating member shown in FIG. 7
taken along the line B-B, corresponding to FIGS. Reference numeral 25 denotes a vibrating
member, which differs from the vibrating member 15 in that the reinforcing resin 28 is filled in
the plurality of projection shaped spacer portions 26a and 26b formed on a part of the flat
portion 25b. It is the same as the vibrating member 15 of the second embodiment in that a space
27 is provided between the flat portion 25 b where the spacer portion 26 does not exist and the
bottom surface of the voice coil 6 to form a vent. The spacer portion 26 reinforced by the resin
28 increases the bonding strength with the voice coil 6, and in addition to the improvement of
bonding reliability, it is possible to reduce the area of the spacer portion 26 or reduce the
number thereof. Become.
[0033]
Next, a conductive speaker according to a third embodiment of the present invention will be
described with reference to FIGS. 9 and 10. FIG. 9 and 10 show a conductive type speaker
according to a third embodiment of the present invention, and FIG. 9 is a plan view showing the
back side of the vibrating member, and FIG. 10 is a cross section of the vibrating member shown
in FIG. It is a figure, and respond | corresponds to said FIG. 2, FIG. A vibrating member 35 has the
same configuration as that of the vibrating member 15, but the application position of the
adhesive 8 for bonding the voice coil 6 is different. That is, the fixing of the vibrating member 35
and the voice coil 6 is fixed by the adhesive 8 applied between the two spacer portions in the flat
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portion 35b.
[0034]
As shown in FIGS. 9 and 10, among the plurality of spacer portions formed on the flat portion
35b, for example, the adhesive 8 is applied between the spacer portions 36a and 36b, and
between the next spacer portions 36b and 36c. The adhesive 8 is applied alternately between the
two spacer portions so that the adhesive 8 is applied between the next spacer portions 36 c and
36 d without applying the adhesive 8. The voice coil 6 is adhesively fixed by the adhesive 8
applied between the spacer portions in a state of being positioned on the 12 spacer portions.
[0035]
Then, in the portion where the adhesive 8 is not applied, a gap 37 having the same height as the
spacer portion 36 is formed between the bottom surface of the voice coil 6 and the flat portion
35b of the vibrating member 35 to form a vent. ing. According to the above configuration, the
application of the adhesive 8 to the flat portion 35b can be uniformly performed using the two
spacer portions 36 as a guide portion, and the voice coil 6 can be placed on the spacer portion
36 for positioning. So the positional accuracy and adhesive strength of the voice coil 6 are
improved.
[0036]
Although the spacer portion of the conductive speaker in each of the above embodiments is
integrally formed on the vibrating member, it is not limited to this, and a spacer member
separate from the vibrating member is provided. It is also possible to fix the spacer member
between the flat portion of the vibrating member and the voice coil to form an air gap. Further,
as the separate spacer member, a foamable resin or the like which is lightweight and has a
certain degree of rigidity is desirable.
[0037]
It is sectional drawing of the conduction type speaker in the 1st Embodiment of this invention. It
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11
is a top view which shows the back surface side of the vibration member shown in FIG. It is AA
sectional drawing of the vibration member shown in FIG. It is an expanded sectional view of X1
part of the conduction type speaker shown in FIG. It is an expanded sectional view of X2 part of
the conduction type speaker shown in FIG. FIG. 3 is a cross-sectional view of the vibrating
member shown in FIG. It is a top view which shows the back surface side of the vibration
member of the conduction type speaker in the 2nd Embodiment of this invention. It is BB
sectional drawing of the vibration member shown in FIG. It is a top view which shows the back
surface side of the vibration member of the conduction type speaker in the 3rd Embodiment of
this invention. FIG. 10 is a cross-sectional view of the conductive speaker according to the related
art, which is a cross-sectional view taken along the line B-B of the vibrating member illustrated in
FIG. 9. It is a top view which shows the back surface side of the vibration member shown in FIG.
It is AA sectional drawing of the vibration member shown in FIG. It is an expanded sectional view
of X part of the electroconductive type speaker shown in FIG.
Explanation of sign
[0038]
1 frame 2 yoke 3 permanent magnet 4 top plate 5, 15, 25, 35, vibrating member 5a, 15a, 25a,
35a, vibrating portion 5b, 15b, 25b, 35b, flat portion 5c, 15c, 25c, 35c, edge damper portion 6
voice coil 7 lead wire 8 adhesive 10, 50 conductive type speaker 16, 26, 36 spacer portion 17,
27, 37 air gap
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