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JPS6213197

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DESCRIPTION JPS6213197
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
coaxial speaker in which heat dissipation of a tweeter is improved and input resistance is
improved. 2. Related Art In recent years, coaxial speakers with good directivity have been
announced by each network 1, and a large number of high surface 1 input speakers
corresponding to digital sources are also commercially available. ????????? A
conventional coaxial speaker will be described below with reference to the drawings. The
conventional 1q11 speaker of this type has a structure as shown in FIG. 2, as shown in 1, for
example, JP-A-59-215199. That is, the heat generated at the ring portion of the pois coil 40 wire
of the tweeter constituted by 1 to 7 is dissipated into the air through the plate 5 and the yoke 7,
and further passes through the through holes 8 a of the inner frame 8. Since the heated air
comes out, the temperature rise of the voice coil 4 of the tweeter is kept low. Problems to be
solved by the invention However, with such a structure, a speaker system with relatively low
input (for example, less than DIN 50 W) has no problem, but in the case of a speaker system with
a large input, The heat radiation area of the plate 6 and the yoke 7 is sufficient, and the amount
of heat radiated is smaller than the amount of heat produced in the wire ring portion of the voice
coil 4. As a result, there is a problem that the temperature rise of the voice coil 4 is broken after
reaching the limit. The results of the experiments conducted by the inventors are shown as a
temperature of the tweeter voice coil in FIG. In the experiment, the diameter 1911 B of the voice
coil 4 of the tweeter, the copper clad aluminum wire of ? 0.1 1 for its wire ring, and the bobbin
impregnated with phenol impregnated kraft, although not shown, During the note 6, a so-called
gap portion into which a magnetic fluid (a dispersion of fine magnetic powder dispersed in oil)
was injected was used. The impedance of the extraneous voice coil 4 is 6 ?, the crossover
frequency of the work circuit is 2 KHz, and the input is DIN 90 W. As a result, the temperature
rose in the curve indicated by 20 in FIG. 3, and after 20 hours, the wire was finally broken at 160
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░ -L rise. At this time, the bottom temperature of the yoke end reached 130 degrees or more. In
the case of a coaxial speaker, the tweeter is often miniaturized due to the need to increase the
diaphragm area of the woofer and the desire to improve directivity, and the heat dissipation area
of the field section becomes smaller and less sweet. Also inhibits heat dissipation. As described
above, simply providing the through hole 8 a in the inner frame 8 makes it possible to obtain a
high input speaker system.
In addition, since the temperature of the bottom of the yoke 7 reaches a high temperature, the
inner frame 8 in direct contact with that portion also has to be made of high heat resistant,
expensive materials. Therefore, the present invention suppresses the temperature rise of the
voice coil of the tweeter even at high input, and enables the use of an inexpensive material
having a low heat-resistant temperature for the inner frame and other peripheral parts. Means
for Solving the Problems In order to solve the above problems, the coaxial speaker according to
the present invention comprises a tweeter, an inner 71 holding the tweeter, and a yoke bottom of
the tweeter and an inner bottom of the inner frame. Is provided with a heat sink. Operation
According to the present invention, the heat generated at the wire ring portion of the tweeter
voice coil is transmitted to the yoke by the above-described configuration. Furthermore, after
being transmitted to the heat dissipation plate in contact with the yoke. Since the heat is
efficiently dissipated into the air, the temperature rise of the tweeter voice coil can be suppressed
to a low level. Example 5,. Hereinafter, the coaxial speaker according to the embodiment of the
present invention. Description will be made with reference to the drawings. FIG. 1 is a crosssectional view of a coaxial speaker according to an embodiment of the present invention,
showing a two-way configuration consisting of a tweeter and a woofer. In FIG. 1, the same parts
as in FIG. 2 as the conventional example are given the same reference numerals. Description of
all components has been omitted, and will be described again here. 1 is a diaphragm, 2 is an
edge, 3 is a frame holding an edge, 4 is a voice coil, 5 is a plate, 6 is a magnet, 7 is a yoke, and
these 1 to 70 parts constitute a tweeter, The parts of 5 and 6.7 constitute the field section. Next, I
will explain the woofer. 9 is an annular diaphragm, and 10a and 10b are inner and outer edges
supporting the diaphragm 9, respectively. The reference numeral 11 denotes a frame, a 12 bar
damper, a 13 id drive cone, and a voice coil 14. The movement of the voice coil 14 is coupled to
the diaphragm 9 via the drive cone 13 while being supported by the damper 12. . ??????
?? The reference numeral 16 denotes a magnet, and the reference numeral 17 denotes a yoke,
which constitute a field section. An inner frame 8 is connected to two pole faces of the yoke 17
of the woofer, and an upper end thereof is bonded and fixed to the inner peripheral portion of
the inner edge 10a, and the tweeter is held at the center. 8a is a through hole of the inner frame
8; The reference numeral 18 designates a screw for detachably attaching the tweeter and the
woofer, which is engaged with the screw hole at the bottom of the tweeter yoke 7.
A heat sink 19 is provided in contact with the bottom of the yoke 7 of the tweeter. About the
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coaxial speaker comprised as mentioned above. The operation will be described below with
reference to FIGS. 1 and 3. In FIG. 1, heat is generated in the ring portion by a music signal or the
like applied to the voice coil 4 of the tweeter. The temperature rises gradually, but the heat is
conducted to the plate 5 or the yoke 7 through the air or magnetic fluid (not shown) in the gear
knob of the field section. The bottom of the yoke 7 is in contact with the heat sink 19 made of a
material having high thermal conductivity such as aluminum. The heat of the yoke 7 is rapidly
transmitted to the heat sink 19 and dissipated efficiently into the air. Since the through holes are
provided in the drive cone 13 and the frame 11 of the woo и, the air warmed by the heat
radiation plate 19 and the like can be ventilated by the outer weir of the woofer, so the heat
radiation is not hindered. The inventors also performed a valve test on the temperature in this
example. The specifications are the same as those described above, but the temperature is about
86 degrees as shown by the curve 21 in FIG. 3 because the aluminum heat sink 19 having a
thickness of 1.6 jll 1 M and an area of 35 trJ is provided. There was no break of the voice coil 4
of the tweeter even when it was stabilized for a month and continuously tested for over 100
hours. It was also found that the temperature rise of the bottom of the yoke 7 of the tweeter at
this time was only around 60 degrees, and it was not necessary to use an expensive material
having special heat resistance as a molding material of the inner frame 8. If the inner frame 8 is
made of aluminum or the like, the heat sink 19 can be substituted. However, if the temperature
of the woofer yoke 17 is large, the heat flows back and it is rather dangerous. Also in other
experiments. According to the present embodiment, the heat sink 19 is provided between the
tweeter, the inner frame 8 holding the tweeter, and the bottom of the yoke 7 of the tweeter and
the inner bottom of the inner frame 8. Since it is possible to suppress the temperature rise of the
voice coil 4 of the tweeter to a low level, it is possible to improve the input resistance and to
reduce the rise in impedance due to the temperature rise of the voice coil 4 as well. It can be very
small. Furthermore, as a molding material of the inner frame 8 and the frame 3 of the tweeter
can be used a relatively inexpensive material such as standard grade mu BS, it is advantageous in
cost. Although both the tweeter and the woofer are flat diaphragms in the first embodiment, it is
not a good idea that the effect of the present invention is lost even with a cone type diaphragm
or dome type diaphragm. .
According to the present invention, the bottom of the yoke of the tweeter 9-8. By setting the heat
sink to abut the contact, it is possible to reduce the rise in temperature of the voice coil of the
tweeter, so it is possible to realize a significant improvement in the input resistance, and also to
reduce the rise in impedance. Deterioration can also be prevented. As it is possible to use lowcost materials such as the inner frame and the frame of the tweeter and molding materials such
as i and so on, it has a very good effect of practical use-1.
[0002]
Brief description of the drawings
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[0003]
FIG. 1 is a cross-sectional view of a coaxial speaker according to an embodiment of the present
invention, FIG. 2 is a cross-sectional view of a conventional coaxial speaker, and FIG. 3 is a graph
showing the temperature of tweeter voice coil-valve characteristics.
3... Frame + 4... Voice coil, 5... Foot 1/7, ....... Yoke, 8. 19 ииииии Heat sink. Name of Agent Attorney
Nakao Toshio and others 1-7 7 1 7-? 19--one side board \ l + Fig. 2 If) t '/ + z fO ,, -IL'2. a 'j 76
Fin lz // Figure 3? ? 40 ? 08? too / 2? crescent meridian (H / L)
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