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DESCRIPTION JPS605700

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DESCRIPTION JPS605700
[0001]
The present invention is to improve the frame to provide a speaker with excellent characteristics.
As a conventional closed loudspeaker, as shown in FIG. 1, a window 2 is formed in a magnetic
circuit 5 formed of a plate 2 provided with a center ball 1, a link-like magnet 3 and a ring-like
upper plate 4 as well. And the peripheral edge of the cone-shaped diaphragm 8 together with the
gasket 7 at the periphery of the frame 60, and the voice coil 10 to the center of the diaphragm 8;
The lower part of the voice coil 10 is inserted into the magnetic gap 12 of the magnetic circuit 6
without eccentricity by holding the middle part of the voice coil by the damper 11, and the nonair permeable dust cap 13 is closed on the central upper surface of the diaphragm 8 It was
configured. Since such a closed-type speaker has a small volume between the rear surface of
diaphragm 8 and frame 6, the stiffness of air in this volume is increased and the minimum
resonance frequency io of the speaker or the high-frequency speaker is high. In the frequency
characteristic, there is a drawback that a large rise (Q becomes large) occurs in the low band. In
order to improve such a drawback, methods of making the volume of the back surface of the
diaphragm 8 thicker or letting the air between the diaphragm 8 and the frame 6 out are
inspected. An example is shown in FIG. FIG. 2 shows a configuration in which the through hole
14 is provided in the diaphragm 8 so that the air between the diaphragm 8 and the frame 6 is
released to the outside, and thereby the stiffness of the air between the diaphragm 8 and the
frame 6 is h Minimum resonance frequency f as a speaker. I tried to lower the In addition, as a
substitute for the through holes 14, it is also considered to make the diaphragm s itself
breathable. However, the mechanical strength of the diaphragm 8 is weakened by providing the
through holes 14 in the diaphragm 8 or air permeability as described in 4 above, and the
characteristics in the high region where the distortion is increased. When they were
disorganized, they always had drawbacks. The present invention eliminates the above-mentioned
conventional defects, and by improving the frame, the air between the diaphragm and the frame
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1
is released to the outside, the lowest resonance frequency is low, and the speaker is stable as the
frequency characteristic. It is intended to be provided. Hereinafter, an embodiment of the present
invention will be described with reference to FIG. A magnetic circuit 16 includes a plate 17
having a center ball 16, a ring-shaped magnet 18, and a ring-shaped upper plate 19.
The magnetic circuit 16 is made of metal, and a frame 2o having no window is connected by
welding or the like. The frame 2o has a bottom surface 20a serving as a coupling portion to the
magnetic circuit 16, an inclined portion 20b extending obliquely from the peripheral portion of
the bottom surface 20a, and a horizontal portion 200 continuously with the upper end of the
inclined portion 20b. An inclined portion 20 (i, and an upper end horizontal portion 20e of a step
connecting the peripheral portion of the diaphragm to the upper end of the inclined portion 20d,
and an upper end of the inclined portion 20c) It is configured to have a downward inclined
portion 2Of which is extended downward to the outer periphery of the horizontal portion 20e,
and a terminal horizontal portion 20g having the same height as the horizontal portion 20C at
the lower end of the downward inclined old city 2Of. An air vent 21 is provided in the portion
20d and the lower inclined portion 2Of. The peripheral edge portion of a cone-shaped diaphragm
22 is bonded to one end of the frame 2o (end horizontal portion 20e) by bonding or the like, and
the voice coil 23 is coupled to the central portion of the diaphragm 22. A middle portion 23 is
held by a damper 24 and a lower portion of the seventh coil 23 is fitted into the magnetic gap 26
of the magnetic circuit 16 without eccentricity. Also, on the upper surface of the central portion
of the diaphragm 22, a non-air-permeable dust camp 26 is attached. In this configuration, when
an input signal is opened 1) to the voice coil 23, the voice coil 23 vibrates up and down in the
magnetic gap 25 and the vibration is transmitted to the diaphragm 22 so that sound is radiated
from the diaphragm 22. However, when the diaphragm 22 vibrates, the air in the space between
the diaphragm 22 and the frame 2 ░ enters and exits from the vent hole 21 of the frame 20, and
the stiffness of the air in this space becomes small. , The lowest resonant frequency f as a
speaker. Can be low. The baffle plate 27 is assembled so that the horizontal portion 2oc and the
terminal horizontal portion 20g of the frame 2o are in contact with each other as shown by a
broken line. As described above, since the Ariake speaker is configured, the air in the space
between the diaphragm and the frame can be made to flow in and out by means of the vent holes
in the peripheral portion of the frame according to the vibration of the diaphragm. The resistance
can be used to eliminate the buildup in the low frequency range of the sound pressure frequency
characteristics and to lower the lowest resonance frequency, and to deteriorate the strength of
the diaphragm to increase distortion or to increase the high frequency characteristics. It is a
stable, high-quality one with no deterioration of the characteristics, and becomes a practical
value straight dog.
[0002]
Brief description of the drawings
12-04-2019
2
[0003]
FIG. 1 is a half sectional front view of a conventional sealed speaker, FIG. 2 is a half sectional
view showing another conventional speaker, and FIG. 3 is a half sectional view showing one
embodiment of the speaker of the present invention .
15 иииии Magnetic circuit, 20 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и vent holes, 22 и и и diaphragm, 23 и
и и voice coil, 24 и и и? Damper, 25 ? ? ? ? ? ? Magnetic gap, 26 ? ? ? ? ? ? ? ? Dust
camp. Name of Agent Attorney Nakao Toshio Other 1 person Figure 1 Figure 2 Figure 1 q Figure
3
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3
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