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JPS52121226

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DESCRIPTION JPS52121226
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1a and 1b are a schematic longitudinal sectional
view and a transverse sectional view of a conventional skier apparatus, and FIGS. 2a and 2b are
schematic longitudinal sectional views of the skier apparatus showing one embodiment of the
present invention. Top view and cross-sectional view. Fig. 3 asb is a longitudinal sectional view
and a transverse sectional view showing another embodiment of the present invention. FIG. 4 is a
diagram showing the time-temperature rise characteristics of a shell. In the drawings, the same
reference numerals indicate the same or corresponding parts, 1 is a baffle plate, 2 is a side plate,
3 is a back plate, 4 and 4 'are a top plate and a base plate, 5.5'. 5 '/ is a reinforcing rod, 6 is a
sound absorbing material, 7 is a skier frame, 8 is a cabinet, and 9, 9' is a connecting rod. .
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker
apparatus having the effect of reinforcing bars for reducing the plate vibration of the speaker
box and the apparatus for radiating the heat rise generated in the voice coil of the speaker. It is
necessary to reduce the plate vibration generated in the speaker box as much as possible
because it has an influence such as distortion of the sound radiated from the speaker or
deterioration of transient characteristics. The cause of the plate vibration of the speaker box is
mainly due to the (1) (+-1 7 ") / 1/1 b action of the speaker vibration, the frame of the speaker
vibrates the baffle plate, The vibration of the baffle plate is transmitted as a longitudinal vibration
(vibration in a direction parallel to the plate surface of the side plate) in the low frequency range
to vibrate the back plate. The phase of plate vibration between the plate walls is complicated and
irregularly changes with the vibration frequency of the speaker. In order to damp these
complicated plate vibrations, reinforcement bars are used as shown in FIG. 1 in the cabinet I of
the speaker. On the other hand, the conversion efficiency of the electric input to the sound
output to the speaker is only a few pieces, as is well known, and the residue is heat. Therefore,
when a large input is applied to the speaker, the temperature of the voice film rises rapidly,
causing an accident such as burnout or disconnection of the voice coil lead. In the audio
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amplifier, it is customary to use a holding circuit by a relay as a measure against heat generation
in order to prevent damage to the circuit cake due to a short circuit of the output or the like.
However, in the case of speakers, a large input has not been put into a voice coil until now, and
thermal measures have not been taken except for a small number of speakers (2). However,
recently, due to the appearance of a large output amplifier, and the use in a large hole, an
outdoor hole, etc., a high input resistant speaker system has been required. As a measure for
damage to the speaker due to temperature rise of the voice coil, 1) Make a circuit and interrupt
when a large input enters the voice coil to protect the voice coil. 2) Use heat-resistant ones for
the rupture of the wire of the voice coil, the adhesive, and the bobbin. 3) The method of attaching
a heat sink to the frame etc. of the speaker is mainly used. However, in 1), it is difficult to set a
new voice coil input for protecting the voice coil. In 2), the performance of the adhesive that can
be obtained is about 250 ° -aoocfi% g, and the coating of the insertion wire and the material of
the bobbin are not sufficient yet. In 3), there is no effect unless a large heat sink is attached. Each
had a drawback. This L device simultaneously solves the above-mentioned measures against the
reduction of the longitudinal plate vibration and the measures against the temperature rise of the
voice 1-character correction coil, as shown in FIG. 2 and FIG. The speaker frame (in the (3) 2
'device, the speaker frame means a portion other than the vibration system of the speaker) and a
part or the whole connected between any two sets of plates of the cabinet. By connecting a
reinforcing material made of a good material with a material having good heat conductivity), it is
possible to effectively reduce any plate vibration and temperature rise of the voice coil.
This will be described in detail with reference to the drawings. Fig. 1 (b (b) A thermal
countermeasure is taken in the longitudinal sectional view of the device where the plate buckle
of the front plate vibration and the back plate are connected by reinforcement bars and the plate
vibration of the cabinet is reduced and the horizontal cross section It is the one of the character
correction worker. Here, (1) is a puff full plate to which the speaker frame 1ill is attached, (2) is a
side plate, (3) i is a back plate, (4) is a top plate, (4) ′ ′ is a ground plate, (5) Are usually made
of wood, with reinforcing bars connecting the full board □ i + t + and the back plate (3). (6) is a
sound absorbing material for removing standing waves generated inside the cabinet. In FIG. 1,
the heat generated in the speaker voice coil is gradually conducted to the speaker frame (7), but
the surface area of the normal speaker frame (1) is small, and the radiation is caused by the
radiation of 1 (4). Attenuation of temperature can not be expected. Also, the cabinet (8) made of
wood and the internal sound absorbing material (6) both have a thermal conductivity of
approximately 0, txca VIC, compared to aluminum 2oOKca〆 C1 pure iron 5axca crush 0C used
for the speaker frame (7) And much smaller, there is almost no radiation of heat from the cabinet
(8). FIG. 2 (a.lambda. (1+) is a sectional view showing an embodiment of the present invention,
and (1) to (4) and (6) to (8) are similar to the longitudinal one shown in FIG. (A reinforcing bar
made of a material having high or low thermal conductivity in part or in whole. (9) is a rod made
of a high material of a heat conduction car in which the speaker frame (7) and the reinforcing bar
(+ are connected to each other). Of course, there is no problem if they are integrally made. As a
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result, as shown in FIG. 94, the voice coil temperature is lowered by about 40 ° to 50 ° in the
method according to the invention in comparison with the conventional method K shown in the
curve a. Has been confirmed. (Note that the characteristic curve in FIG. 4 was measured at & at a
frequency of 20 at a frequency of 20. 3) (&), (11) show another embodiment of the present
invention, (5) Of the present invention, both damping of the plate vibration and measures against
temperature rise of the voice coil Kjl are also effective. It is a thing. (1)∼+41. + 61 to (8)
are the same as those of 巳 1 in Fig. 1 and have a one-character correction, and (C) is a part or
the whole that also dampens the plate vibration of the side plate by connecting the opposing side
plates (2) Is a reinforcing bar made of a material with high thermal conductivity. (6) is a rod
made of a material having a high thermal conductivity, which thermally connects the reinforcing
bars (i) and (C), l, and the effect shown in FIG. I can do it.
In addition, the implementation of Fig. 2 and Fig. 3: In both of the examples, reinforced
reinforcement (W (C) is made of wood and aluminum 11 ′ ′ ′ jo wood is wrapped in “7”
structure) Rather than lowering the price by one: Kiru · ■ As mentioned above, this device is a 1
'! ″′”D、$J! KM+1−″tamit“7“のである。
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