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JPH11136793

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH11136793
[0001]
Prior to the present invention, we proposed a repulsive multi-point drive type speaker in
Japanese Patent Application No. 9-147037, etc., but the present invention relates to the structure
of the multi-repulsion multi-point drive type speaker, in particular, the diaphragm. It relates to
the improvement of the structure.
[0002]
2. Description of the Related Art An example of a repulsive multi-point drive type speaker
proposed last time will be described with reference to FIGS. 10 and 11. The maximum external
dimensions of the speaker are 49.6 mm wide, 228 mm long and 20 mm deep (magnetic circuit) A
thin plate for driving the diaphragm 1 having an elongated shape having a flat shape of about 6:
1 and an aspect ratio of about 6: 1 by three sets of voice coils C and a repulsive magnetic circuit
RM. In addition, it is a multipoint drive type speaker having a slender shape.
[0003]
The diaphragm 1 has a width of 29.4 mm, a length of 183 mm, and a thickness of 3 mm, and is
formed into a track shape by connecting the end portions of the long sides with a curve having a
radius of 14.7 mm.
[0004]
The material of the diaphragm 1 is mainly pulp, and the hole 13 for attaching the voice coil C
with a diameter of 17 mm on the center line of the diaphragm 1, and one at the center of the
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diaphragm 1 and a center distribution 60 mm A total of three locations are provided, and a
bonding margin portion for attaching the edge 2 to the outer peripheral portion on the back side
of the diaphragm 1 is further provided.
[0005]
The edge 2 is an edge (hereinafter referred to as a conductive edge 2) formed by attaching a
conductor in a state along the main roll 21 disposed on the outer peripheral portion.
The conductor used is a hot-pressed rubber-coated edge substrate generally used in many cases,
and the conductor used is any number of conductive wires known as so-called cob wire formed
by winding copper wire foil around fibers. In addition, a silk yarn wire (hereinafter referred to as
a plain knitting silk yarn wire W) knitted in a flat knitting shape.
), And the flat knitting tinsel wire W is attached by sewing two threads in parallel along the
sticking margin of the edge 2 with a thread.
[0006]
As shown in FIG. 11, the diaphragm 1 with the conductive edge 2 has a coil inner diameter of
16.23 mm (tolerance 0, +0.05 mm), a winding width of about 3.6 mm, 144 turns, and 6 winding
layers. The called bobbinless type voice coil C is attached by adhesion to obtain the voice coil C
and the diaphragm 1 with a conductive edge.
Then, the voice coil C and the diaphragm 1 with a conductive edge are attached to a frame by
adhesion.
[0007]
The outer diameter of the frame 3 is made of ABS resin containing glass fibers having a length of
228 mm, a width of 49.6 mm, and a depth of 15 mm, and the center of the frame 3 is at the
bottom 32 of the basket portion of the frame 3 as shown in FIG. , And a guide pole portion 31
having a diameter of 14 mm and a diameter of 4.9 mm (0, -0.1 tolerance) and 14 mm in height is
provided by integral molding at a total of three locations distributed 60 mm in the length
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direction from the center. At the center of the top of the portion 31, a screw hole 36 for 3 mm is
provided at a depth of 6 mm.
[0008]
Further, two flanges 33 for mounting the input terminal lug 4 (see FIG. 7) are provided in one of
the flanges 33 for mounting the frame 3 provided on the short side of the frame 3. The terminal
lugs 4 are attached by caulking, and the mounting pitch dimension of the terminal lugs 4 is the
same as the sewing pitch dimension of the flat knitting tinsel wire W attached to the conductive
edge 2.
[0009]
The terminal lug 4 is an input terminal lug 4 often used for a conventional general speaker, and
is commonly referred to as a faston terminal lug, and is plated with nickel by pressing brass with
a plate thickness of 0.5 mm. One of the parts shown in the figure is the positive side lug and the
other is the negative side input terminal lug 4.
[0010]
The frame 3 with the connection wiring between the voice coil C and the input terminal lug 4
completed by soldering the input terminal lugs 4 to the end of the flat knitting tinsel wire W is
soldered, and the pole of the frame 3 with the vibration system The three repulsion magnetizing
circuits RM are inserted into a portion, fixed by screws as shown in FIG. 10 after a predetermined
mounting operation, and the outer periphery of the center plate RM3 of the repulsion magnetic
circuit RM and the voice coil The multipoint drive type speaker is completed by fixedly mounting
in a state where it has a predetermined clearance L shown in FIG.
[0011]
Magnets RM1 and RM2 in the repulsion magnetic circuit RM have a ring shape with an outer
diameter of 15 mm (tolerance +0.2 mm, −0.2 mm), an inner diameter of 5.1 mm (tolerance +0.2
mm, 0 mm) and a thickness of 6 mm The center plate RM3, which is a magnetic circuit
component using a neodymium magnet with a maximum energy storage of 37 Me, is made of a
generally used iron plate, and has an outer diameter of 15.83 mm (tolerance of 0 mm, −0. It is
galvanized with a ring shape with an inner diameter of 5.1 mm (tolerance +0.05 mm, 0 mm) and
a thickness of 2 mm.
[0012]
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The multipoint driven speaker is referred to as a plasma display panel (hereinafter referred to as
a PDP).
And the like for practical use for the purpose of being used in a flat-screen television.
[0013]
Therefore, it is expected that the speaker has the specified environment atmosphere for general
household appliances in the reliability test, for example, under the environment of −20 ° C. to
60 ° C. and the humidity of approximately 40% to 80%. It is possible to achieve the purpose by
exhibiting the performance, and it has been confirmed that the speaker is a loudspeaker that
exhibits the performance stably and sufficiently withstands practical use.
[0014]
However, when the multi-point drive type speaker is used for vehicles, etc., it is known that the
temperature in the environmental atmosphere in which the speaker is used is further lowered or
increased, for example, in the reliability test. The ambient atmosphere temperature is -30 ° C to
80 ° C and the humidity is about 40% to 80%, and the speaker to be tested must exhibit the
desired performance in the atmosphere, but the speaker It was found that abnormal noise was
generated in the vicinity of ° C. and under relatively low humidity conditions.
[0015]
The cause of the abnormal sound is the expansion or contraction of the speaker, and when the
ambient temperature where the speaker is installed rises or falls, the frame 3 and the vibration
system parts also expand or contract accordingly.
Because the expansion coefficient of the frame 3 and the vibration system parts, in particular, the
expansion coefficient of the vibration plate 1 are different, the installation interval of the
repulsive magnetic circuit RM shown in the figure is extended or reduced as a result. The
clearance L set for the voice coil C deviates from a predetermined value.
[0016]
In a conventional single point drive type speaker in which the central portion of the cone-shaped
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diaphragm 1 is driven by one voice coil C, expansion or contraction of the frame 3 and the
diaphragm 1 is from the center of the front of the speaker Since the dimensions of the voice coil
C and the dimensions of the magnetic circuit components constituting the magnetic gap occur
concentrically, and the dimensions of the magnetic circuit components constituting the magnetic
gap are so small that the thermal expansion can be ignored, the abnormality due to the thermal
expansion difference between the diaphragm 1 and the frame 3 It is not necessary to consider
the generation of sound, and the above-mentioned failure can be said to be due to the structure
of the multipoint drive type speaker.
[0017]
On the other hand, when a thermal expansion difference appears in the frame 3 and the
diaphragm 1 of the multipoint drive type speaker, the center plate RM3 outer diameter portion
and the voice coil C inner diameter portion of the repulsion magnetic circuit RM disposed above
and below shown in the figure. One of the clearances L (0.2 mm) is narrow and the other is wide.
When an audio signal is added and the vibration system is oscillated while the clearance L is
narrowed beyond the allowable range, the center plate outer diameter portion and the coil inner
diameter portion constituting the clearance L come in contact with each other to generate an
abnormal sound.
[0018]
The reason why the multi-point drive speaker proposed by us last time can be used without any
problem in practical use is that the temperature in the environmental atmosphere is -20 ° C to
60 ° C and the humidity is about 40% to 80% Therefore, when the normal temperature is about
20 ° C., the speaker assembled under the normal temperature will be installed in an
environment having a temperature difference of about plus or minus 40 ° C. Under this
environment, the glass fiber is This is because the change in the clearance L due to the expansion
difference between the frame 3 and the diaphragm 1 made of pulp falls within a practically
acceptable tolerance.
[0019]
However, when the environmental temperature is -30 ° C. to 80 ° C. and the humidity is about
40% to 80%, it is naturally installed in an environment where the temperature difference is even
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larger. On the large, high temperature side, the change of the clearance L due to the expansion
difference exceeds the allowable range and an abnormal sound is generated.
In order to avoid the problem, as one means, the same material is selected as the vibration
system, in particular, the material of the diaphragm 1 and the material of the frame 3, and the
mutual expansion coefficients are made the same.
Alternatively, even if the material of the diaphragm 1 and the material of the frame 3 are
different, the expansion coefficient is selected to be substantially equal.
[0020]
However, in consideration of the sound quality and frequency characteristics of the speaker, it is
often extremely difficult to obtain the matching of the expansion coefficient with the vibration
system and the frame 3 in order to preferentially consider the material and shape of the
diaphragm 1 Even if the expansion coefficients of all the parts constituting the speaker can be
made to completely match, it has the following drawbacks.
For example, assuming that the speaker is installed at the door of a car and the car is operated
under the sun, the speaker frame 3 is heated over the door, and the diaphragm 1 is cooled by the
cold air of the air conditioner. Can easily be imagined.
[0021]
In other words, the environment in which the in-vehicle speaker is installed changes much more
rapidly than the home speaker, and when the in-vehicle speaker is mounted on the vehicle body,
the components constituting the speaker, in particular, the diaphragm 1 and the frame 3 Since
the temperature difference necessarily occurs as described above, and the temperature
difference is used in an extremely large environment, the diaphragm 1 and the frame 3 always
have a difference in thermal expansion, and the speaker component It can be said that the
measures to adjust the expansion coefficient of are less practical means that can not be expected
to be effective.
[0022]
Therefore, the present invention solves the problems of the conventional multi-point drive type
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loudspeakers, and the environmental changes such as on-vehicle loudspeakers are severe, and
each component of the loudspeakers, especially the diaphragm 1 It is an object of the present
invention to provide a speaker that can reliably exhibit the expected performance of the speaker
even if a difference in thermal expansion amount occurs in the frame 3.
[0023]
[Means for Solving the Problems] In order to achieve the above object, the diaphragm 1 is cut at
an arbitrary position, and the cut positions are provided with slits 11 at arbitrary intervals, and
these are connected to form one sheet. The diaphragm 1 is configured, and further, the joint
portion has a structure capable of absorbing expansion or contraction.
[0024]
DESCRIPTION OF THE PREFERRED EMBODIMENTS The speaker structure of the present
invention will be described with reference to FIGS. 1 to 9. However, the basic structure of the
speaker is the same as that of the prior art, and common parts are given the same component
numbers as the prior art. is there.
The parts completely similar to the prior art are the voice coil C and the magnetic circuit parts
RM1, RM2 and RM3. The frame 3 and the diaphragm 1 and the edge 2 are slightly changed in
design.
The external dimensions and material of the diaphragm 1 are completely the same as those of
the conventional example, but as shown in FIG. 1, the slit 11 with a width of 1 mm is distributed
30 mm from the center line in the horizontal direction in the front view. It is a cut shape with the
provided shape.
[0025]
That is, the diaphragm 1 of the present embodiment becomes the central diaphragm 1C, the
upper diaphragm 1U, and the lower diaphragm 1D in a state where the diaphragm 1 of the
conventional example is divided into three equal parts.
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Therefore, the central diaphragm 1C has a width of 29.4 mm and a length of 60 mm, and a voice
coil C mounting hole is provided at the center of the diaphragm 1C. The upper and lower
diaphragms 1U and 1D have a width of 29.4 mm and a length of 60. The end of the diaphragm 1
adjacent to the central diaphragm 1C of the diaphragm 1 is at right angles, and the other end is
connected by a circular arc having a radius of 14.7 mm, and the hole 13 for voice coil C
attachment has a diameter of about 17 mm. The central diaphragm 1C, the upper diaphragm 1U,
and the lower diaphragm 1D are disposed at a position 29 mm from the end adjacent to the
central diaphragm 1C on the central line connecting the central diaphragm 1C, the upper
diaphragm 1U, and the lower diaphragm 1D.
[0026]
Edge 2 is basically the same as the conventional example, and has an outer diameter dimension
of 202 mm in length and 48 mm in width, and has a track shape in which long sides and short
sides (widths) are connected by an arc of 24 mm in radius. A bonding margin portion having a
width of about 3 mm for bonding the edge 2 to the frame 3 from the outermost side toward the
inside is provided in the outer bonding margin portion 24 which is a circular arc portion and a
linear portion.
[0027]
A shape in which a main roll 21 having a width of 6 mm and a radius of 3 mm and having a
width of 6 mm inward from the outer bonding margin portion 24 protrudes to the front side of
the diaphragm 1 as shown in the local enlarged cross sectional view shown in FIG. It is called up
roll.
And a bonding margin of 3 mm in width for bonding to the diaphragm 1 toward the inner side in
a circular arc portion, and a bonding margin of 4 mm in width is described as a linear portion
(hereinafter, referred to as an inner bonding margin 25).
Provided in).
Hereinafter, differences from the conventional example will be described.
[0028]
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A shape in which a roll portion having a width of about 2 mm and a cross-sectional radius of
about 1 mm protrudes to the back side of the diaphragm 1 at a position corresponding to the
diaphragm 1, that is, a position distributed 30 mm above and below the center line of the edge 2
Mark it as a down roll.
Provided in). That is, the main roll 21 of the straight portion of the edge arranged on the left and
right shown in the figure crosses, and the upper and lower inner bonding margin portions are
vertically connected to form a connecting roll 22. A bonding margin portion of 3 mm is provided,
and the bonding margin portion becomes a joining portion 23 of the respective diaphragms 1U,
1C, 1D (see FIG. 1 (c)).
[0029]
As in the conventional example, since the flat knitting tinsel wire W is sewn in parallel with the
same size (about 26 mm) as the conventional one, as shown in FIG. One flat yarn is attached to
the back of the 25 straight portions, and each flat knitting tinsel wire W passes from the bonding
margin 25 through the main roll 21 to reach the arc portion of the outer bonding margin portion
24, and one arc The end portion of the flat knitting tinsel wire W extending to the portion is
extended in a length of about 6 mm, and the plain knitting tinsel wire W serves as a wiring
material for supplying an input signal to the voice coil C.
[0030]
The conductive edge 2 is attached to the three divided diaphragms 1U, 1C, 1D, but the method of
attaching the conductive edge 2 to the diaphragms 1U, 1C, 1D is the same as the conventional
attachment method of the diaphragm 1 and the edge 2, A rubber-based adhesive H (hatched
portion shown in FIG. 2) is applied to the edge pasting margin 12 of the diaphragm 1, the solvent
of the adhesive H is evaporated, and both of the edge 2 and the diaphragm 1U, 1C, 1D While
applying pressure to the bonding margin by applying heat and pressure treatment to the bonding
margin, the adhesive margin H is thermally reactivated to attach and attach the bonding margin
to each other. .
[0031]
In the case of the present embodiment, when the diaphragms 1U, 1C, 1D in three divided states
are placed at predetermined positions of the lower mold DD as shown in FIG. 2, the upper
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diaphragm 1U, the central diaphragm 1C, the lower left diaphragm 1D In a continuous state, the
adjacent end portions of the respective diaphragms 1 are installed in the mold so that the width
(1 mm) of the predetermined slit 11 is obtained.
Next, when the edge 2 is put in a predetermined position (see FIGS. 3 and 4), each connecting roll
22 of the edge 2 covers the 1 mm wide slit 11 adjacent to the diaphragm 1U, 1C, 1D The inner
pasting margin portion 25 and the joint portion 23 are installed in a state of being overlapped
with the pasting margin portion 12 of the diaphragm 1, that is, the adhesive H application
portion.
[0032]
In this state, as shown in FIG. 4, the upper mold UD is lowered to apply pressure and bond.
In the case of this embodiment, the upper mold UD temperature is about 200 ° C., the pressure
is about 600 kg (shaft output), and the press time is about 6 seconds. Since the edge 2 is the
same conductive edge 2 as the conventional example, the flat knitting tinsel wire W is sewn on
the straight portion of the inner bonding margin 25 and the straight line of the bonding margin
12 of the diaphragm 1U, 1C, 1D. In this state, two wiring members for supplying the input signal
to the voice coil C are mounted in parallel, and after bonding, the diaphragm 1 is taken out of the
lower mold DD and the vibration with the conductive edge 2 is generated. Plate 1 is obtained.
[0033]
The diaphragm 1 with the conductive edge 2 is connected and connected by the edge 2 to form
an integrated state. To describe the details, a slit having a width of 1 mm is formed at the
connecting portion, that is, the portion adjacent to the diaphragm 1, the edge connecting portion
23 is mounted on both sides of the slit, and the slit is covered with a roll 22. The respective
diaphragms 1U, 1C, and 1D are connected. In the case of the present embodiment, the diaphragm
is completely divided, but a roll portion may be provided at the connecting portion of the
diaphragm 1, that is, the slit 11, or a part of the roll portion 12 as shown in FIG. It is also possible
to cut out and connect at the connecting portion 23 of the edge 2 and at the connecting roll 22
as described above.
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[0034]
The voice coil C is attached to the diaphragm 1 with the conductive edge 2, but the specification
of the voice coil C this time is completely the same as that of the conventional example. Also, the
mounting method was the same as the method proposed last time, and the voice coil C was
mounted using the mounting jig J as shown in FIG. The voice coil C installation portion J1 is
disposed at three positions of the predetermined position on the mounting jig J of the voice coil
C. Therefore, the voice coil C inner diameter portion is inserted into the installation portion J1.
The lead wire portions C1 and C2 of the voice coil C are arranged in a predetermined direction.
[0035]
Furthermore, as shown in FIG. 6, holes for voice coil C attachment of the diaphragm 1 are
inserted into the outer diameter portion of the voice coil C and installed in the attachment jig J.
The lead wire portions C1 and C2 of each voice coil C Is drawn on the back surface of the
diaphragm 1 and guided to a predetermined position of the flat braided filament wire W disposed
at the bonding margin of the diaphragm 1 (straight line portion of the edge inner bonding
margin), and the winding start side C1 of the lead wire is Lead the end to the plus side plain
knitting tinsel wire W, and guide the end of the winding end side C2 to the minus side plain
knitting tinsel wire W, and solder the contact portion between the end and the plain knitting
tinsel wire W Para connection wiring.
[0036]
Since the diaphragm 1 is provided with an adhesive reservoir consisting of a slope of about 45
degrees toward the outside around the hole 13 for voice coil C attachment, acrylic adhesive is
used in each adhesive reservoir. An adhesive is applied uniformly to about 0.17 g, and after the
adhesive cures and reaches the required strength, the wound portion of the coil wire and the
soldered portion are coated with a rubber adhesive and covered, After the diaphragm 1 is taken
out of the assembling jig J as shown in FIG. 6 after the processing for preventing a rattling noise
generated from the joint portion etc., the voice coil C and the diaphragm 1 are adhesively
bonded, and the voice coil The voice coil C and the diaphragm 1 with a conductive edge
completed with the wiring with the flat knitting tinsel wire W for C and the input signal supply
are completed.
[0037]
The voice coil C and the diaphragm 1 with a conductive edge are bonded to the frame 3, but the
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frame 3 of this embodiment is almost the same as the frame 3 of the conventional example, the
difference is that the edge 2 is bonded as shown in FIG. The groove 35 has a width of 3 mm and
a depth of 1.2 mm in that a groove 35 corresponding to the joining roll 22 of the edge 2 is
provided in the frame 3 bonding margin portion (hatched portion shown in the figure).
The method of attaching the voice coil C and the diaphragm 1 with conductive edge to the frame
3 in the present embodiment applies the rubber-based adhesive H to the frame 3 bonding
margin, that is, the edge bonding portion, The bonding margin portion of the edge is placed on
the surface, and the edge 2 bonding margin portion is pressed and bonded.
[0038]
A voice coil C positioning jig is installed in the guide pole portion of the frame 3 at the time of
bonding, and the voice coil C inner diameter portion is inserted into the jig to bond the voice coil
C and the diaphragm 1 with the edge 2 Therefore, bonding is performed while maintaining the
predetermined positional relationship between the voice coil C and the pole portion 31.
[0039]
After the diaphragm 1 is attached to the frame 3, the voice coil C, the diaphragm 1 and the
conductive edge 4 are attached with the pole portion 31 of the frame 3 disposed at the center of
the inner periphery of the voice coil C. The frame 3 in the broken state was obtained, and the
connection between the voice coil C and the input terminal lug 4 shown in FIG. 8 was completed
by soldering the input terminal lugs and the flat knitting tinsel wire W end as in the conventional
example. A frame 3 of the state (hereinafter referred to as a frame with a vibration system) is
obtained.
[0040]
Furthermore, the inner diameter portions of three repulsive magnetization circuits RM are
inserted into the pole portions 31 of the vibration system-attached frame, fixed by screws b as
shown in FIG. The multi-point drive type speaker is completed by fixedly mounting the outer
peripheral portion of the center plate RM3 of the circuit RM and the inner diameter portion of
the voice coil C in a state of having a predetermined clearance L.
[0041]
According to the speaker structure of the present invention, when a difference appears in the
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amount of thermal expansion in the frame 3 and the diaphragm 1, the dimensional change of the
frame 3 and the diaphragm 1 is severe particularly in an environment with a large temperature
difference. Even in this case, since the difference in the amount of expansion can be absorbed by
the slit portion of the diaphragm 1 and the roll portion of the edge, the center plate outer
diameter portion and the voice coil C inner diameter portion have a constant numerical value
(about 0.2 mm). It is possible to keep the provided clearance L constant.
Therefore, it is possible to avoid a situation where the change in the clearance L provided in the
center plate outer diameter portion and the voice coil C inner diameter portion due to the
difference in expansion amount as in the conventional multipoint drive type speaker exceeds the
allowable range. Sufficient performance can be obtained, and the selection of the material of the
vibration system components and the material of the frame 3 is not affected, so the degree of
freedom in design is increased.
[0042]
Brief description of the drawings
[0043]
FIG. 1 is a front view, a cross-sectional view and a local enlarged cross-sectional view of a
repulsive multipoint drive speaker of the present invention.
[0044]
FIG. 2 is a perspective view showing a state immediately before the diaphragm of the repulsive
multi-point drive speaker of the present invention is installed in a mold.
[0045]
FIG. 3 is a perspective view showing a state immediately before installing the diaphragm of the
repulsive multi-point drive speaker of the present invention in a mold and further installing an
edge.
[0046]
FIG. 4 is a perspective view showing a state in which a diaphragm and an edge of the multirepelling drive speaker according to the present invention are installed in a mold and the edge is
further pressed by an upper mold.
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[0047]
FIG. 5 is a perspective view showing a state immediately before the edged diaphragm and voice
coil of the repulsive multi-point drive speaker according to the present invention are installed on
an assembly jig.
[0048]
FIG. 6 is a perspective view showing an assembled state of the edged diaphragm and voice coil of
the repulsive multi-point drive speaker of the present invention and a completed state.
[0049]
FIG. 7 is a perspective view showing a state immediately before the edge of the repulsive multipoint drive speaker of the present invention and a diaphragm with a voice coil are adhered to a
frame.
[0050]
FIG. 8 is a perspective view showing a completed state in which a repulsion magnetic circuit is
attached to a diaphragm, a voice coil, and a frame with a terminal lug of the repulsion multipoint
drive speaker of the present invention.
[0051]
FIG. 9 is a perspective view showing another example of the diaphragm of the repulsive multipoint drive speaker of the present invention, and a local enlarged perspective view thereof.
[0052]
FIG. 10 is a front view, a cross-sectional view and a local enlarged cross-sectional view of a
conventional repulsive multi-point drive speaker.
[0053]
FIG. 11 is a perspective view showing an edge of a conventional repulsive multi-point drive
speaker and a diaphragm with a voice coil.
[0054]
Explanation of sign
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[0055]
DESCRIPTION OF SYMBOLS 1 diaphragm 11 slit 12 sticking allowance 13 hole 1U for coil
attachment upper diaphragm 1C central diaphragm 1 D lower diaphragm 2 edge 21 main roll 22
connecting roll 23 joining part 24 outside pasting margin 25 inside pasting margin 3 frame 31
pole Part 32 bottom part 33 flange part 34 input terminal lug mounting hole 35 connecting roll
groove 36 screw hole 4 input terminal lug C voice coil DD lower mold H adhesive J voice coil
mounting jig J1 voice coil setting part L clearance UD Upper mold W Flat knitting tinsel wire RM
Repulsive magnetic circuit RM1 Magnet RM2 Magnet RM3 Center plate b Screw
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