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DESCRIPTION JP2005033593

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DESCRIPTION JP2005033593
In a coaxial (coaxial) speaker in which a second speaker is attached on a center pole forming a
magnetic circuit of a first speaker, in particular, in a state where the second speaker is stably and
correctly positioned. Attach to the center of the 1 speaker. SOLUTION: A cylindrical support 30 in
a substantially cup shape is formed by forging with a steel plate, and a bottom portion of the
cylindrical support 30 is fixed on a center pole 12 of a magnetic circuit 10 of a first speaker by a
screw 31. At the same time, the outer peripheral surface of the magnetic circuit 33 of the second
speaker 32 is fitted and held by the fitting support portion which is the tip end portion of the
cylindrical support 30 and is on the open side. [Selected figure] Figure 3
Speaker device
[0001]
The present invention relates to a speaker device, and more particularly to a speaker device in
which a second speaker is mounted on a center pole which forms a magnetic circuit of the first
speaker.
[0002]
There is known a coaxial (coaxial) speaker device in which a plurality of speakers having
different tone ranges are coaxially arranged, and a high sound side speaker is attached on a
center pole of a low sound side speaker.
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Such a speaker device can radiate the sound emitted from the speaker carrying each band from
substantially the center of the speaker on the low frequency side, and can be simply and
collectively configured. Therefore, it is widely used particularly as an on-vehicle speaker device.
[0003]
In JP-A-11-285091, a support for supporting a medium to high-tone speaker unit standing on a
center yoke constituting a magnetic circuit of a bass speaker unit is formed into a polygonal
shape to enhance the heat radiation effect of the surface, and Form a groove through which the
heated air in the space of the magnetic circuit can be released to the outside of the cone to
enhance the cooling effect of the coaxial type speaker device used in a narrow place such as a car
Discloses a coaxial speaker device.
[0004]
In such a speaker device, for example, an aluminum alloy drawing material is used as a column
erected on the center yoke of the low frequency speaker, and the column is fixed by screws on
the center pole of the low frequency speaker. The bottom of the magnetic circuit of the high-tone
speaker is adhered and fixed to the tip of the support.
Therefore, the positioning of the mid to high sound speaker attached to the tip of the support is
not always reliable, and in some cases, the center positions of the low sound speaker and the
high sound speaker may be offset from each other. Further, since the high sound speaker is
attached by adhesive bonding to the tip of the support, the high sound speaker may not be
sufficiently held. Also, an adhesive layer is interposed between the tip of the column and the
bottom of the magnetic circuit of the high-tone speaker, and the adhesive layer prevents the
conduction of heat between the magnetic circuit of the high-tone speaker and the column. This in
particular impedes the heat dissipation of the magnetic circuit of the high-tone speaker.
[0005]
JP-A-11-285091 JP-A-7-322385 JP-A-2002-215270
[0006]
An object of the present invention is to provide a speaker device capable of stably holding a
second speaker on a center pole of the first speaker.
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[0007]
Another object of the present invention is to provide a speaker device capable of correctly
positioning and mounting a second speaker on the center pole of the first speaker.
[0008]
Still another subject of the present invention is that the heat from the magnetic circuit of the
second speaker mounted via the support on the center pole of the first speaker flows or is
dissipated to the support, thereby in particular Another object of the present invention is to
provide a speaker device capable of preventing the temperature rise of the second magnetic
circuit.
[0009]
The main invention of the present application is to attach the proximal end of a cylindrical metal
support which is extended forward through the inner space of the voice coil bobbin to the center
pole which forms the magnetic circuit of the first speaker; The present invention relates to a
speaker apparatus characterized in that a fitting and holding portion is provided at a tip end
portion, and the second speaker having a higher sound range than the first speaker is held by the
fitting and holding portion.
[0010]
Preferably, the support is substantially cup-shaped and is fixed to the tip of the center pole by
screws or bolts.
Further, it is preferable that the fitting holding portion of the support be engaged with and held
by the outer peripheral portion of the magnetic circuit of the second speaker.
Further, it is preferable that the fitting holding portion of the support be fitted to and held by the
outer peripheral portion of the magnetic circuit of the second speaker and the outer peripheral
portion of the frame.
Preferably, the fitting holding portion of the support receives a corner portion between the outer
peripheral portion and the bottom surface of the magnetic circuit of the second speaker.
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[0011]
Another main invention of the present application mounts the proximal end of a cylindrical metal
support which is extended forward through the inner space of the voice coil bobbin to the center
pole forming the magnetic circuit of the first speaker A grille frame is provided at the distal end
of the body, which holds a second speaker having a higher sound range than that of the first
speaker by providing a fitting holder at the tip end of the body, and is attached to the frame of
the first speaker The present invention relates to a speaker apparatus characterized in that a
center side coupling portion is brought into contact with a fitting holding portion of the support,
and a speaker grill attached to the grill frame covers the front of the second speaker.
[0012]
Preferably, the grille frame comprises a radially extending arm, and the tip of the arm is attached
to the outer periphery of the frame of the first speaker.
In addition, it is preferable that the tip end of the fitting holding portion be sandwiched and held
by the outer peripheral portion of the frame of the second speaker and the connecting portion of
the grill frame.
[0013]
In still another main invention of the present application, the proximal end of a cylindrical metal
support, which extends forward through the inner space of the voice coil bobbin, is attached to
the center pole forming the magnetic circuit of the first speaker; A fitting holding portion is
provided at the tip end of the support, and the second portion holding a higher sound range than
the first speaker is held by the fitting holding portion, and the tip end portion of the fitting
holding portion The present invention relates to a speaker apparatus characterized in that a
holding frame is supported on an outer peripheral portion of the second speaker, and the third
speaker having a higher sound range than the second speaker is held by the holding frame.
[0014]
Here, it is preferable that the holding frame includes a holding portion that extends outward at a
predetermined position in the circumferential direction, and the third speaker is held by the
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holding portion.
Further, it is preferable that the holding portion be formed by die-casting of an aluminum alloy
and also be used as a heat dissipation means.
[0015]
According to the first main invention, the second speaker is mounted while being held by the
fitting holding portion of the cylindrical metal support mounted on the center pole of the first
speaker. As a result, the holding of the second loudspeaker becomes stable, and the fitting holder
makes it possible to ensure particularly radial positioning.
Also, no adhesive is required to attach the second speaker to the first speaker, heat transfer from
the second speaker to the support by the adhesive layer is not impeded, and the heat dissipation
is improved. Excessive temperature rise of the two speakers is prevented.
[0016]
According to another main invention, heat is caused to flow from the fitting holder to the grille
frame through the joint of the grille frame by bringing the central joint of the grille frame into
contact with the fitting holder of the support. .
Therefore, the grille frame functions as a heat dissipation means, and it becomes possible to
prevent the temperature rise of the first speaker or the second speaker.
[0017]
According to still another main invention, the holding frame is supported on the outer peripheral
portion of the second speaker by the tip end portion of the fitting holding portion, and the third
holding frame provides a higher frequency range than the second speaker by the holding frame.
The speaker is held. Therefore, the holding frame holding the third speaker functions as a heat
dissipation means with respect to the fitting holding portion, and the heat of the first speaker or
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the second speaker is dissipated by the holding frame via the fitting holding portion. It will be
possible.
[0018]
FIG. 1 and FIG. 2 show the entire configuration of the speaker device according to the present
embodiment, and the speaker device is provided with a magnetic circuit 10 of a first speaker
which takes on a low frequency range. As shown in FIG. 2, the magnetic circuit 10 is provided
with a substantially disk-shaped yoke 11, and a cylindrical center pole 12 projecting upward is
integrally provided at the center of the yoke 11. A ring-shaped magnet 13 is attached to the
outer peripheral side of the center pole 11. The magnet 13 is magnetized such that both ends in
the axial direction have different poles. A ring-shaped plate 14 is attached to the upper surface of
the magnet 13.
[0019]
A portion between the circular opening provided at the center of the plate 14 and the outer
peripheral surface of the center pole 12 forms an air gap 15, and the voice coil 16 is disposed in
the air gap 15. That is, the voice coil 16 is disposed in the air gap 15 in a state of being wound
around the outer periphery of the cylindrical bobbin 17.
[0020]
Mounted on the plate 14 is a cup-like steel frame 20 whose front side is open. In the frame 20, a
diaphragm 21 made of a cone is attached. That is, the outer peripheral portion of the diaphragm
21 is attached and fixed to the front of the outer peripheral edge of the frame 20 via the edge 22
formed of a ring having a semicircular cross section, and the outer peripheral portion of the edge
22 is framed by the gasket 23. It is fixed to
[0021]
The central portion of the diaphragm 21 is fixed to the outer periphery of the bobbin 17 on
which the voice coil 16 is wound. A damper 24 is disposed below the diaphragm 21 in FIG. The
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damper 24 connects the bobbin 17 and the frame 21. An input terminal plate 25 is provided on
the outer surface of the frame 20. The tinsel wire 26 is connected to the input terminal plate 25.
[0022]
A cylindrical support 30 is mounted on the center pole 12 of the magnetic circuit 10, as shown
particularly in FIG. The cylindrical support 30 is formed by forging of metal such as iron, steel,
copper, brass, aluminum alloy or the like, and the bottom portion thereof is fixed to the upper
surface of the center pole 12 by a screw 31. ing. The mid-high-pitched speaker 32 is supported
by the cylindrical support 30.
[0023]
The magnetic circuit 33 of the middle to high-tone speaker 32 is provided with a cup-shaped
yoke 34, and the magnet 35 is held at the center of the inside of the yoke 34. A center pole 36 is
mounted on the magnet 35, and a portion between the outer periphery of the center pole 36 and
the inner peripheral surface of the yoke 34 constitutes an air gap. The voice coil 37 is disposed
in the air gap in a state of being wound around the bobbin 38.
[0024]
A diaphragm 41 made of a cone of the middle to high-pitched speaker 32 is attached to the
bobbin 38, and an outer peripheral portion of the diaphragm 41 is supported by a frame 43.
Further, a damper 42 is disposed between the bobbin 38 and the frame 43. In addition, the
decoration ring 44 is attached to the outer peripheral side of the frame 43. A dome-shaped cap
45 is attached to close the opening of the bobbin 38.
[0025]
Next, the operation of such a speaker will be described. When an audio signal is supplied to the
voice coil 16 of the first speaker via the input terminal plate 25, the voice coil 16 disposed in the
air gap 15 of the magnetic circuit 10 by this audio signal is a bobbin according to Fleming's left
hand rule. Receives 17 axial forces. For this reason, the bobbin 17 moves in the same direction,
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and the diaphragm 21 vibrates in the same direction in accordance with this movement, and the
sound is reproduced.
[0026]
The same applies to the operation of the second middle to high-pitched speaker 32, and when an
audio signal is supplied to the voice coil 37 disposed in the air gap of the magnetic circuit 33
through the input terminal plate 25, The law produces an axial force on the bobbin 38, which
causes the diaphragm 41 coupled to the bobbin 38 to vibrate in the axial direction of the bobbin
38. Accordingly, the sound of middle and high range is reproduced.
[0027]
A characteristic of such a speaker device is that the cylindrical support 30 in which the second
middle high-pitched sound speaker 32 is fitted and effectively contributes to heat dissipation. As
described above, when the temperature change of the voice coils 16 and 37 of the first and
second speakers when steel formed by forging, for example, is used as the cylindrical support 30,
the results shown in FIG. 4 are obtained. The That is, when continuous input was performed at
50 W, the temperature of the voice coil 16 of the first low-frequency speaker (WF) finally
saturated and stabilized at 178 ° C. On the other hand, the voice coil 37 of the second middle /
high-tone speaker (TW) 32 was saturated at 158 ° C.
[0028]
By supporting the magnetic circuit 33 of the second speaker 32 in particular with the cylindrical
support 30 made of metal, the temperature rise of the second speaker (TW) 32 is gradual due to
the increase of the heat capacity by the cylindrical support 30. At the same time, the heat
dissipation effect of the cylindrical support 30 lowers the saturation temperature of the second
speaker 32. Also for the first speaker, the temperature of the voice coil 16 in the magnetic circuit
10 is lowered because the heat is dissipated by the cylindrical support 30.
[0029]
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FIG. 5 shows a speaker of a comparative example in which the cylindrical support 30 is formed
of a resin molded body. The change in temperature when 50 W continuous input is performed
for the speaker of the comparative example is shown in FIG.
[0030]
When a resin is used as the cylindrical support 30, the heat dissipation of the magnetic circuit 33
of the second speaker 32 is particularly impeded because the support 30 functions as a heat
insulating means, and the temperature rise of the voice coil 37 becomes rapid. . Finally, heat is
stored in the magnetic circuit 33 of the second speaker, and the temperature of the voice coil 37
finally reaches 188 ° C. In addition, since the voice coil 16 of the first speaker is also stored in
the magnetic circuit 10 and is not dissipated, the final temperature is 184 ° C., and the metal
cylindrical support 30 is used. The temperature will be higher than in the case. Therefore, if
metal is used instead of resin as the cylindrical support 30, the cooling efficiency is increased by
6% for the low frequency speaker (WF) 32 and by 20% for the high sound speaker (TW).
[0031]
Another feature of such a speaker device is that, as shown in FIGS. 2 and 3, the center pole 12 of
the magnetic circuit 10 of the first speaker via the cylindrical support 30 for the second medium
high to high frequency sound speaker 32 via the cylindrical support 30. It is to support above.
That is, the outer periphery of the magnetic circuit 33 of the mid-high-tone speaker 32 is
received by the fitting holding portion on the tip side of the cup-shaped cylindrical support 30,
and the mid-high-tone speaker 32 is stably held. In this embodiment, the open end of the
cylindrical support portion 30 is abutted against the lower end portion of the frame 43 of the
middle to high-tone speaker 32.
[0032]
Therefore, according to such a structure, the positioning in the circumferential direction and the
height direction of the second speaker 32 is very stable. In particular, when the inner diameter of
the open end of the cylindrical support 30 is made to match the outer diameter of the magnetic
circuit 33 of the middle to high-tone speaker 32 with high accuracy, the second speaker 32 can
be stably held by the fitting accuracy of both. As well as being possible, the positioning of the
second loudspeaker 32 is very easy.
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[0033]
Further, the magnetic circuit 33 of the middle to high-tone speaker 32 is fitted on the center pole
12 of the first speaker via the fitting holding portion at the tip of the cylindrical support 30
without necessarily using an adhesive. It becomes possible to attach. Therefore, the adhesive
layer becomes a heat insulating layer and the flow of heat from the second speaker 32 to the
cylindrical support 30 is not impeded. This means that, in particular, an excessive temperature
rise of the magnetic circuit 33 of the middle to high-tone speaker 32 can be prevented. That is,
the cylindrical support 30 can prevent the temperature rise of the magnetic circuit 33 of the
second speaker 32 as well as the magnetic circuit 10 of the first speaker.
[0034]
Next, modifications of the above embodiment will be described. The modification shown in FIG. 7
is the frame 43 of this speaker as well as the outer peripheral portion of the magnetic circuit 33
of the middle high / high sound speaker 32 by the fitting support portion of the cylindrical
support 30 mounted on the center pole 12 of the first speaker. It also covers the outer periphery
of That is, the cylindrical support 30 is narrowed in three steps so as to substantially match the
outer peripheral portion of the magnetic circuit 33 of the speaker 32 and the outer peripheral
portion of the frame 43. The magnetic circuit 33 and the frame 43 of the speaker 32 are
received. Therefore, the holding of the second speaker 32 becomes stable, and the cylindrical
support 30 can ensure the heat radiation of the second speaker 32 in particular.
[0035]
FIG. 8 shows another variation. In this modification, the bolt 31 penetrating the center pole 12 of
the first speaker is screwed into the female screw hole of the yoke 34 of the magnetic circuit 33
of the second speaker 32, and the second speaker 32 is pulled downward by the bolt 31. Thus,
the cylindrical support 30 is fixed on the center pole 12. The cylindrical support 30 is fitted to
and held by the outer peripheral surface of the magnetic circuit 33 of the second speaker 32.
Moreover, the radially bent portion of the upper end of the cylindrical support 30 abuts on the
lower end of the frame 43. The frame 43 is also used as a decoration ring.
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[0036]
FIG. 9 shows still another modification. In this modification, the bolt 31 penetrating the center
pole 12 of the first speaker is screwed into the female screw hole of the yoke 34 of the magnetic
circuit 33 of the second speaker 32, and the yoke 34 is pulled downward to support the
cylindrical shape. The body 30 is fixed on the center pole 12. The cylindrical support 30 is
formed such that the upper end thereof opens substantially to the outer peripheral side, and the
opened portion receives the lower surface of the yoke 34.
[0037]
10 and 11 show still another variation. Also in this variation, the bolt 31 passes through the
center pole 12 and is screwed into the female screw hole of the yoke 34 of the magnetic circuit
33 of the second speaker 32. The outer peripheral surface of the magnetic circuit 33 of the
second speaker 32 is held by the fitting support portion on the upper end side of the cylindrical
support 30. Moreover, the flange portion on the tip end side of the cylindrical support 30 is in
contact with the lower surface of the frame 43 of the second speaker 32 and the decoration ring
44. Here, in particular, the decoration ring 44 is formed of an aluminum die-cast decoration ring,
and constitutes a heat sink. Therefore, even if the heat of the magnetic circuits 10 and 33 is
transmitted to the cylindrical support 30, the heat is further dissipated by the decoration ring 44.
[0038]
Next, a second embodiment will be described with reference to FIGS. In this embodiment, a grill
frame 50 holding a speaker grill 54 is coupled to the cylindrical support 30. That is, the grille
frame 50 is attached to the front side of the first speaker and to the outer peripheral portion of
the frame 20. The grille frame 50 is formed of, for example, a formed body of an aluminum alloy,
and its main portion has an oval shape. A total of four arms 51 extending obliquely upward and
obliquely downward are connected to the grille frame 50, and the distal ends of the arms 51 are
fixed to the outer periphery of the frame 20.
[0039]
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Further, a coupling portion 52 formed of a circular recess is formed in a central portion of the
grille frame 50, and the inner peripheral surface of the coupling portion 52 is formed on the
outer peripheral surface of the cylindrical support portion 30 as shown in FIGS. It is supposed to
be fitted. A speaker grill 54 made of a metal net is attached to a step 53 provided inside the grill
frame 50. The speaker grill 54 covers the front side of the second speaker 32.
[0040]
The cylindrical support 30 coupled to the coupling portion 52 of the grill frame 50 is fixed on
the center pole 12 of the first speaker by a bolt 31, and the magnetic circuit 33 of the second
speaker 32 is fixed. The magnetic circuit 33 is fitted to the outer peripheral portion to hold the
magnetic circuit 33, and the portions on both ends of the cylindrical support 30 are narrowed in
two steps to hold the outer peripheral portion of the frame 43. The outer peripheral surface of
the cylindrical support 30 holding the outer peripheral portion of the frame 43 of the second
speaker is fitted to the outer peripheral surface of the connecting portion 52 of the grill frame
50.
[0041]
Therefore, according to such a configuration, the cylindrical support member 30 supporting the
second speaker 32 on the center pole 12 of the first speaker is fitted to the coupling portion 52
of the grille frame 50 at the outer peripheral portion on the tip end side. Will be combined.
Therefore, the grille frame 50 functions as a heat radiating means with respect to the cylindrical
support 30, and at the same time, the outer peripheral portion on the tip end side of the
cylindrical support 30 is stably positioned and held.
[0042]
Next, a third embodiment will be described with reference to FIGS. In this embodiment, a third
speaker, that is, a high sound speaker 63 is attached to the front end of the second speaker 32
via a support 60. A die-cast support 60 made of aluminum alloy is attached to the outer
peripheral portion of the frame 43 of the second speaker 32 mounted via the cylindrical support
30 on the center pole 12 of the first speaker. Then, a holding portion 62 protruding in the radial
direction is formed at a predetermined position in the circumferential direction of the support
60, and the high sound speaker 63 is held by the holding portion 62.
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[0043]
A cylindrical support 30 is mounted on the center pole 12 of the first speaker, and a bolt 31
penetrating the center pole 12 is screwed into a female screw hole of the yoke 34 of the
magnetic circuit 33 of the second speaker 32. Further, a flange 59 is formed at a tip end side
portion of the cylindrical support 30, and the flange 59 supports the support 60 via a screw 61
at a front side portion.
[0044]
Accordingly, the support 60 is attached and held on the flange 59 of the cylindrical holding
portion 30, and the support 60 serves as the heat dissipating means of the cylindrical support 30
together with the support of the high sound speaker 63. Therefore, the temperature rise of the
cylindrical support 30 can be prevented by the support 60.
[0045]
The present invention is widely applicable to reproduction of sound, particularly as a coaxial type
speaker device in which a plurality of speakers are coaxially mounted. In particular, it can be
widely used as an on-vehicle speaker which must be arranged in a limited space.
[0046]
It is a front view showing the shape of the whole of a speaker.
[0047]
It is the sectional view on the AA line in FIG.
[0048]
It is the principal part enlarged sectional view.
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[0049]
It is a graph which shows the state of the temperature change of the voice coil of a speaker.
[0050]
It is a principal part expanded sectional view of the speaker of the comparative example using
the resin-made cylindrical support body.
[0051]
It is a graph which shows the state of the change of the temperature of the voice coil of the same
speaker.
[0052]
It is a principal part expanded sectional view of the speaker apparatus of a modification.
[0053]
It is a principal part expanded sectional view of the speaker apparatus of another modification.
[0054]
It is a principal part expanded sectional view of the speaker apparatus of another modification.
[0055]
It is a front view of the speaker apparatus of another modification.
[0056]
It is a principal part expanded sectional view of the speaker device.
[0057]
It is a front view of the speaker apparatus of 2nd Embodiment.
[0058]
It is a principal part longitudinal cross-sectional view.
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[0059]
It is a principal part disassembled perspective view of the same speaker apparatus.
[0060]
It is a front view of the speaker apparatus of 3rd Embodiment.
[0061]
It is the BB sectional drawing in FIG.
[0062]
It is the same principal part disassembled perspective view.
Explanation of sign
[0063]
10. Magnetic circuit 11. Yoke 12. Center pole 13. Magnet 14. plate 15. Air gap 16. Voice coil 17.
Bobbin 20 Frame 21 ... Diaphragm (cone), 22 .. Edge, 23 .. Gasket, 24 .. Damper, 25 .. Input
terminal plate, 26 .. Wire, 30 .. Tubular support, 31 .. .. .. Speakers for middle and high-pitched
sound, 33 .. magnetic circuit, 34 .. yoke, 35 .. magnet, 36 .. center pole, 37 .. voice coil, 38 ..
bobbin, 39 .. (Cone), 42 .. Damper, 43 .. Frame, 44 .. Ornament Ring, 45 .. Cap, 50 .. Grill Frame,
51 .. Arm, 52 .. Joint, 53 .. Step, 54 .. .. Speaker curb , 59 ‥‥ flange, 60 ‥‥ support, 61 ‥‥
bis, 62 ‥‥ holding portion, 63 ‥‥ tweeter
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