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JPS63153998

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DESCRIPTION JPS63153998
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker provided with an acoustic resistor on a diaphragm. 2. Description of the Related Art
Conventionally, in a cone speaker or dome speaker at -Jl, braking is mainly performed by an
electromagnetic force generated in a voice coil to improve frequency characteristics and
transient characteristics of the speaker. In the case of braking by the electromagnetic force of the
coil, if it is used by being connected to the amplifier through a network or an attenuator, the
braking force is reduced in a certain frequency range, the braking is insufficient, and the
transient characteristics are degraded. Foam rubber etc. are stuck on the back side of the
diaphragm as a method of damping the piston vibration that the high frequency division
vibration of the hard dome and the diaphragm move as one unit, or a soft sound absorbing
material in the space on the back side of the diaphragm It is known to touch and let it act as a
braking resistance, but it was not very effective in improving frequency characteristics and
transient characteristics. Further, Japanese Patent Application Laid-Open No. 54-150121
discloses a technique for attaching a mechanical element on a diaphragm via a visco-elastic body
to thereby prevent split resonance of the diaphragm. Further, Japanese Utility Model Laid-Open
No. 56-6192 has a disk shape having a central hole, the inner periphery thereof is fixed to the
outer periphery of the diaphragm, and the outer periphery is fixed to the frame. There is shown a
loudspeaker characterized in that it comprises a material. Further, in Japanese Utility Model LaidOpen Publication No. 54-181924, in a flat plate speaker, a flat plate is annularly formed of a
sound absorbing elastic material, and the outer diameter is smaller than the outer diameter of the
flat diaphragm and the inner diameter is the outer diameter of the voice coil. Technology to
insert a larger support member between the flat plate diaphragm and the frame, bond both
surfaces, prevent the horizontal shake of the diaphragm, and absorb the standing wave between
the frame and the diaphragm It is shown. However, this type of device does not make the
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acoustic resistance to the diaphragm suitable either, and the high frequency characteristics and
transient characteristics of the speaker deteriorate to increase the equivalent mass of the
diaphragm, resulting in acoustic distortion. There was a problem of causing [Problems to be
Solved by the Invention] The present invention has been made from the point of view, and the
object of the present invention is to greatly improve the frequency characteristics and transient
characteristics, and in particular, to vibrate. An object of the present invention is to provide a
speaker including an acoustic resistor on a diaphragm which can prevent acoustic distortion
when the vibration width of the body is large and can make the acoustic efficiency better. [Means
for Solving the Problems] For the purpose of the present invention, therefore, it is an acoustic
system comprising a holder fixedly provided substantially parallel to a diaphragm and a soft
porous body provided between the holder and the diaphragm. In the speaker equipped with a
resistor, the holder is provided with a through hole, and the first soft porous body is annularly
provided between the holder and the diaphragm so as to surround the through hole, and the
through hole is provided. This is achieved by the above-mentioned speaker characterized in that
it is closed by a second soft porous body having a density lower than that of the first soft porous
body.
[Function] 畝 如 ((に よ り に よ り 低 密度 密度 密度 密度 密度 密度 密度 密度 密度 密度 密度 密
度 密度 密度 密度 密度 密度 密度 密度 密度 に よ り に よ り に よ り に よ り に よ り に よ り に
よ り に よ り に よ り に よ り に よ り に よ り に よ り に よ り に よ り に よ り 密度 密度 密
度 密度 密度Thus, it is possible to prevent the acoustic distortion particularly when the vibration
width of the diaphragm is large, and to significantly improve the frequency characteristics and
the transient characteristics. Thus, when the diaphragm vibrates, the volume of the space
surrounded by the holder, the diaphragm and the first and second soft porous bodies periodically
fluctuates, in which case, in the soft porous body The flow of air is generated, so that a flow
resistance is generated to apply a braking force to the diaphragm. The first soft porous body
itself is subjected to deformation such as compression when the diaphragm moves, and when the
amplitude of the diaphragm is large, the flow resistance value in the first soft porous body
changes, so the second soft porous body If a body-filled air flow passage is not provided, the
generated braking force becomes excessive and causes distortion. However, in the present
invention, a low density second porous body is provided, which is not subject to deformation due
to the vibration of the diaphragm and has a constant resistance value. Even when the amplitude
of the diaphragm is large, an appropriate braking force can be generated without the occurrence
of distortion. That is, the feature of the acoustic resistor according to the present invention is that
the air flow generated by the vibration of the diaphragm by providing the second soft porous
body having a density lower than that of the first soft porous body in the through hole of the
holder. Most of the air flow in the second soft porous body is used to damp the diaphragm, and
the low-density second soft porous body is not subjected to deformation such as compression
even if the diaphragm moves. Even when the vibration width of the diaphragm is large, the flow
resistance value in the second soft porous body is kept constant to improve the frequency
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characteristics. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present
invention will now be described in detail with reference to the drawings. FIG. 1 is a sectional view
showing an embodiment of a speaker according to the present invention, and FIG. 2 is an
enlarged sectional view showing the details of the acoustic resistor. First, FIG. 1 will be described.
In FIG. 1, 1 is a cone speaker, 2 is a magnet, 3 is a ball piece, 4 is a yoke plate, 5 is a yoke, so that
a cone speaker 1 is a magnet 2, pole piece 3, yoke The magnetic circuit is constituted by the
plate 4 and the yoke 5. 6 is a diaphragm, 7 is an edge for supporting the outer periphery of the
diaphragm 6, 8 is a damper for supporting the central part of the diaphragm 6, 9 is a voice coil
attached to the lower part of the diaphragm 6, 10 is a center A cap 11 is a frame, and 12 is an
acoustic resistor attached to the rear surface of the diaphragm 6.
Thus, the acoustic resistor 12 is disposed to be in contact with the diaphragm 6, and is fixed by
the mounting tool using a frame or the like of the speaker body. Next, the acoustic resistor 12
used for the speaker according to the present invention will be described in detail. In FIG. 2, 6 is
a diaphragm, 12 is an acoustic resistor, 13 is a holder, 14 is an annular first soft porous body,
and 15 is a cylindrical second soft porous body. The acoustic resistor 12 has a lower portion as a
flat plate substantially in parallel to the diaphragm 6, and a holder 13 having a through hole at
the center and a cylindrical portion projecting therefrom is provided between the diaphragm 6
and the holder 13 An annular first flexible porous body 14 is provided, and a cylindrical second
flexible porous body 15 is inserted into the cylindrical portion of the holder 13. As the first and
second soft porous bodies 14, sponges such as soft polyurethanes having continuous cells, fibers
such as felt or glass wool, and other sound absorbing materials are used. In the present
invention, therefore, the second soft porous body 15 having a density smaller than that of the
first soft porous body 14 is used. In the present invention, the hole diameter and the projection
height of the cylindrical portion of the holder 13 are determined to be in the best condition for
the braking effect. In the acoustic resistor 12, when the diaphragm 6 vibrates, most of the air due
to the vibration flows in the second soft porous body 15, and the viscosity resistance of the air is
in the second soft porous body 15. Since the second soft porous body 15 is not affected by the
vibration of the diaphragm 6, the viscous resistance value is kept constant even at a large
amplitude. Vibration can be damped to improve frequency characteristics. The acoustic resistors
12 may be distributed on the surface of the diaphragm 6 symmetrically about the central axis.
Further, in the configuration shown in FIG. 2, both the first and second soft porous bodies are in
the form of a continuous ring along the contour line of one of the diaphragms 6, and the radial
cross section is just FIG. It may be configured to be similar to Since the present invention is
configured as a ladder, according to the present invention, the damping of the vibrating portion
of the speaker and the divided vibration of the diaphragm can be effectively damped, and the
frequency characteristics and the transient characteristics are improved. A speaker can be
provided. The configuration of the present invention is not limited to the above embodiment. For
example, the shapes of the soft porous body and the holder can be freely designed and changed
within the scope of the object of the present invention. To include all of the
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[0002]
Brief description of the drawings
[0003]
FIG. 1 is a sectional view showing an embodiment of a speaker according to the present
invention, and FIG. 2 is an enlarged perspective view showing the details of the acoustic resistor.
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