JP2008028459

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DESCRIPTION JP2008028459
PROBLEM TO BE SOLVED: To reduce the size and thickness of a conductive type speaker used
for a cellular phone etc. When the amplitude is increased to secure a predetermined sound
volume, the voice coil in the air gap of the magnetic circuit can not be set at the optimum
position. There is a problem that the amount can not be secured sufficiently. An object of the
present invention is to provide a conductive type speaker with good acoustic efficiency by
securing a substantial effective coil length of a voice coil without changing a basic configuration
as a conductive type speaker. 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 A spacer portion
protruding to the side was formed, and the voice coil was fixed to the spacer portion. [Selected
figure] Figure 1
Conductive speaker
[0001]
The present invention relates to a conductive speaker, and more particularly to a fixed structure
of a vibrating member and a voice coil.
[0002]
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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. 15 is a cross-sectional view of a conventional conductive speaker. In FIG. 15, reference
numeral 50 denotes a conductive speaker, and 1 denotes an annular frame, which has 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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[0005]
FIG. 16 is an enlarged sectional view of a portion X of the conductive speaker 50 shown in FIG. A
voice coil 6 adhesively fixed to the flat portion 5b of the vibrating member 5 with an adhesive 8
is inserted into the gap G of the magnetic circuit formed by the yoke 2, the permanent magnet 3
and the top plate 4.
[0006]
FIG. 17 is a plan view showing the back surface side of the vibrating member 5 shown in FIG. 15,
and FIG. 18 is a sectional view taken along the line A-A of the vibrating member 5 shown in FIG.
In FIG. 17 and FIG. 18, the vibrating portion 5a is circularly and spherically provided at the
central portion of the vibrating member 5, and a flat portion 5b of a width to which the 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 and 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 side of the edge damper portion 5C is rolled up
and taken out as an external terminal 7b from one place of the fixing portion 5d. . Further, in FIG.
18, 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.
[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 that determine the sound pressure that is the output of the conductive speaker, and
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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. 15 has a
diameter Φ 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]
FIG. 16 shows an example of the size of each part of the conductive speaker 50 incorporated in
the mobile phone, and the requirement for the vibrating part 5a when the external shape of the
vibrating member 5 is 15 mm as a condition for obtaining the performance as the speaker The
amplitude amount H needs to be 0.3 to 0.4 mm or more. Therefore, in order to satisfy this
condition, as shown in FIG. 16, the amplitude of the vibration member 5 is set to the required
amplitude H with the attachment distance H1 from the flat portion 5b at the lowest position of
the vibration member 5 to the top surface A distance obtained by adding a height of 0.05 to 0.1
mm as a retraction distance H2 for avoiding that the bonding portion of the vibrating portion 5a
or the voice coil 6 collides with the top plate 4 during operation, that is, H1 = H + H2. Further,
the air gap distance H3 corresponding to the length of the air gap G forming the magnetic gap is
set to 0.4 to 0.5 mm, which is slightly larger than the necessary amplitude amount H.
[0010]
Then, if the length L of the voice coil 6 adhesively fixed to the flat portion 5b is made larger than
the length obtained by adding the attachment distance H1 and the air gap distance H3, the voice
coil 6 becomes the air gap G by the amplitude operation of the vibrating portion 5a. The sound
pressure improvement can be expected by securing a sufficient amount of crossing crossing the
magnetic flux in the inside of. However, the voice coil 6 formed of this self-bonding copper wire
can secure a sufficient amount of intersection with the magnetic flux if the number of turns is
increased and the length is increased as described above, but the weight of the coil increases. As
a result, the efficiency of the vibration system is lowered, and there is a problem that the winding
resistance value is increased due to the lengthening of the coil wire, resulting in the reduction of
the driving force.
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[0011]
For the above reason, the length L of the voice coil 6 needs to be equal to or slightly shorter than
the length obtained by adding the mounting distance H1 and the air gap distance H3. Since the
voice coil 6 is shortened, the set position of the voice coil 6 with respect to the gap G is shifted
upward with respect to the proper position, resulting in that the effective length of the coil can
not be sufficiently obtained. (Object of the Invention) An object of the present invention is to
provide a conductive type speaker with good acoustic efficiency by securing a substantial
effective coil length of a voice coil without changing the basic configuration as a conductive type
speaker. It is in.
[0012]
A 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 circuit
comprising a top plate fixed to the other magnetic pole side; A conductive type speaker
comprising: a vibrating member comprising an edge damper portion formed around the
periphery; 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, It is a conductive type speaker
characterized in that a spacer portion projecting to the back surface side is formed on a flat
portion of the vibrating member, and a voice coil is fixed to the spacer portion.
[0013]
According to the above configuration, the effective effective coil length of the voice coil can be
secured only by forming the spacer portion by performing simple processing on the vibrating
member, and a conductive speaker with good acoustic efficiency can be provided. .
[0014]
The spacer portion is a plurality of protrusions formed on a part of the flat portion.
[0015]
The spacer portion is a projection formed integrally with the vibrating member.
[0016]
As described above, by forming the spacer portion with a plurality of protrusions, the bonding
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accuracy is improved by reducing the bonding area of the vibrating member and the voice coil,
and the weight reduction and the material can be achieved by reducing the amount of adhesive.
You can save money.
[0017]
The vibration member is a resin sheet, and the spacer portion is a protrusion integrally formed
on the resin sheet.
[0018]
The spacer unit is a spacer member fixed to a flat portion of the vibrating member.
[0019]
A conductive type speaker characterized in that a lead wire of the voice coil is adhered to a
portion where the protrusion of the flat portion does not exist.
[0020]
As described above, the conductive speaker according to the present invention performs simple
processing on the vibrating member to secure a substantial effective coil length of the voice coil
simply by forming the spacer portion, thereby achieving a conductive speaker with good acoustic
efficiency. Can be provided.
[0021]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings.
1 to 4 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 an enlarged cross section of a
portion X of the conductive speaker shown in FIG. FIG. 3 is a plan view showing the back side of
the vibrating member shown in FIG. 1, and FIG. 4 is a cross-sectional view of the vibrating
member shown in FIG.
The conductive type loudspeakers shown in FIGS. 1 to 4 correspond to the conductive type
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loudspeakers in the conventional example shown in FIGS. 15 to 18. The same elements are
denoted by the same reference numerals, and the redundant description will be omitted.
[0022]
In the cross-sectional views of FIGS. 1 and 2, reference numeral 10 denotes a conductive speaker,
and the difference from the conductive speaker 50 shown in FIG. 15 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
[0023]
The differences from the conventional example will be described in detail with reference to the
drawings.
A different point from the conventional vibrating member 5 in FIG. 2 is that a spacer portion 16
projecting to the back surface side is formed at the position of the flat portion 15 b of the
vibrating member 15 and the voice coil 6 is fixed to the spacer portion 16.
As a result, the setting position of the voice coil 6 is lowered downward by the height of the
spacer portion 16, that is, the spacer distance Hs.
As a result, the attachment position of the voice coil 6 is H1 from the upper surface of the top
plate 4 to the flat portion 5b indicated by the dotted line in the related art, while in the case of
the vibrating member 15, the top of the top plate 4 It has been changed to H4 of the department.
As a result, the voice coil 6 is set to the optimum position of the air gap G, and the effective
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length of the coil can be sufficiently obtained to perform efficient driving.
[0024]
As shown in FIGS. 3 and 4, the vibrating member 15 is formed by projecting the spacer portion
16 in a ring shape at the position of the flat portion 15b, and the position of the voice coil 6 as
shown by the dotted line in FIG. In contrast to the height L of the voice coil 6 from S, in the
present invention, the height L of the voice coil 6 is changed to Ls obtained by adding the spacer
distance Hs to the height L of the voice coil 6.
[0025]
Next, a conductive speaker according to a second embodiment of the present invention will be
described with reference to FIGS.
5 is a plan view showing the back surface side of the vibrating member, and FIG. 6 is a crosssectional view of the vibrating member shown in FIG. 5, taken along the line A-A, corresponding
to FIGS.
A vibrating member 25 is different from the vibrating member 15 in that the spacer portion
formed in the flat portion 25b is not ring-shaped, and a plurality of projection shaped spacer
portions 26a and 26b formed in a part of the flat portion 25b. ...
Then, the lead-out wire 7 of the voice coil 6 is drawn by providing the lead-out portion 7a in a
portion where the projection-shaped spacer portion 26 of the flat portion 25b does not exist. The
height relationship of the voice coil 6 in the vibrating member 25 shown in FIG. 6 is the same as
that of the vibrating member 15 in FIG.
[0026]
FIG. 8 is a cross-sectional view taken along the line B-B in FIG. 7 and shows a cross section at the
position of the flat portion 25 b where the spacer portion 26 of the vibrating member 25 is
present. That is, the voice coil 6 shown by a dotted line in FIG. 8 is adhesively fixed to 12 spacer
portions 26 formed on the flat portion 25 b of the vibrating member 25. Therefore, in portions
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where the voice coil 6 is not adhesively fixed to the 12 spacer portions 26, a gap 27
corresponding to the height Hs of the spacer portion 26 between the bottom surface of the voice
coil 6 and the flat portion 25 b of the vibrating member 25. Is formed.
[0027]
In the conductive speaker using the vibration member 25 in the second embodiment, the
adhesion precision is improved by forming the spacer portion with a plurality of projections,
thereby reducing the bonding area of the vibration member and the voice coil, and further
improving the adhesion accuracy. By reducing the amount of adhesive, weight saving and
material cost saving can be achieved. Further, the air gap 27 is formed between the bottom
surface of the voice coil 6 and the flat portion 25 b of the vibrating member 25 so that the flow
of air accompanied by the vibration of the vibrating portion 25 a is improved and the acoustic
characteristic is improved.
[0028]
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 is a plan view showing the back surface side of
the vibrating member, and FIG. 10 is a cross-sectional view of the vibrating member shown in
FIG. 9 taken along the line B-B, corresponding to FIGS. Reference numeral 35 denotes a vibrating
member, which differs from the vibrating member 25 in that reinforcing resin 37 is filled in the
plurality of projection shaped spacer portions 36a and 36b formed on a part of the flat portion
35b. is there. The spacer portion 36 reinforced by the resin 37 can increase the adhesive
strength with the voice coil 6, and in addition to the improvement of the adhesion reliability, the
area of the spacer portion 36 can be reduced or the number of the installed portion can be
reduced. Become.
[0029]
Next, a conductive speaker according to a fourth embodiment of the present invention will be
described with reference to FIGS. 11 to 14 show a conductive speaker according to a fourth
embodiment of the present invention. FIG. 11 is a cross-sectional view of the conductive speaker,
and FIG. 12 is an enlarged cross section of a portion X of the conductive speaker shown in FIG.
FIG. 13 is a plan view showing the back side of the vibrating member shown in FIG. 11, and FIG.
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14 is a cross-sectional view of the vibrating member shown in FIG. The conductive speakers
shown in FIGS. 11 to 14 correspond to the conductive speaker 10 shown in FIGS. 1 to 4, and the
same elements are denoted by the same reference numerals and the description thereof will be
omitted.
[0030]
In FIG. 11, reference numeral 40 denotes a conductive speaker, and the difference from the
conductive speaker 10 is the configuration of the vibrating member 45. That is, as shown in FIG.
12, the spacer member 46 is fixed to the flat portion 45b of the conductive member 45, and the
voice coil 6 is adhered and fixed to the tip of the spacer member 46. The spacer member 46 is
made of, for example, a lightweight resin material such as polyurethane and fixed in advance to
the upper surface portion of the voice coil 6, and the voice coil 6 integrated with the spacer
member 46 is flat of the vibrating member 45. The part 45 b is adhesively fixed to the part 45 b
by the adhesive 8. Furthermore, the height of this spacer member 46 is configured to be the
same spacer distance Hs as the spacer portion 16 in the vibrating member 15 of the conductive
speaker 10, and hence the distance between the voice coil 6 and the air gap G is shown in FIG.
Similarly, the position is set to the optimum position, the effective length of the coil is sufficiently
obtained, and efficient driving is performed.
[0031]
In FIG. 13 and FIG. 14, twelve spacer members 46a, 46b,... Are arranged at substantially equal
intervals on the flat portion 45b of the vibrating member 45, and the voice coil 6 is adhesively
fixed on the spacer member 46. Although shown, it is natural that the spacer member 46 may be
a single ring spacer member. Further, in the case of the spacer member 46, the adhesive strength
with the voice coil 6 can be determined by selecting the material, and therefore, in addition to the
improvement of the adhesion reliability, the area of the spacer member 46 can be reduced Can
be reduced.
[0032]
It is sectional drawing of the conduction type speaker in the 1st Embodiment of this invention. It
is an expanded sectional view of X part of the electroconductive type speaker shown in FIG. It is a
top view which shows the back surface side of the vibration member shown in FIG. It is AA
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sectional drawing of the vibration member shown in FIG. FIG. 10 is a plan view showing the back
surface side of the vibrating member of the conductive speaker in the second embodiment of the
present invention. It is AA sectional drawing of the vibration member shown in FIG. FIG. 10 is a
plan view showing the back surface side of the vibrating member of the conductive speaker in
the second embodiment of the present invention. 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 which is a BB sectional drawing of the vibration member shown in FIG. 10 is a crosssectional view of the vibrating member shown in FIG. 9 taken along the line B-B. FIG. 10 is a
cross-sectional view of the conductive speaker according to the fourth embodiment of the
present invention. It is an expanded sectional view of X part of the electroconductive type
speaker shown in FIG. 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 sectional
drawing of the conduction type speaker in a prior art example. It is an expanded sectional view of
X part of the electroconductive type speaker shown in FIG. 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.
Explanation of sign
[0033]
Reference Signs List 1 frame 2 yoke 3 permanent magnet 4 top plate 5, 15, 25, 35, 45 vibrating
member 5a, 15a, 25a, 35a, 45a vibrating portion 5b, 15b, 25b, 35b, 45b flat portion 5c, 15c,
25c, 35c , 45c Edge damper portion 6 voice coil 7 lead wire 8 adhesive 10, 40, 50 conductive
type speaker 16, 26, 36 spacer portion 46 spacer member
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