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JPH01320900

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DESCRIPTION JPH01320900
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
improvement of a speaker provided with an acoustic resistor on a diaphragm. 2. Description of
the Related Art Conventionally, in a cone speaker, a dome speaker or a horn speaker, the
transient characteristics of the speaker are improved by braking by an electromagnetic force
mainly generated in a voice coil. In the case of braking by the electromagnetic force of a coil, if it
is used by connecting to an amplifier through a network or assembly, the braking force is
reduced in a certain frequency range, the braking is insufficient, and the transient characteristic
is deteriorated. The network divides the electrical input into the respective use bands such as
tweeters and squawkers. The network is divided into the respective frequency bands, and the
attenuation of the electric input at the I cos over frequency is usually -3 db and the out of the use
band Then it will be more than that. Therefore, outside the use band, a large resistance
(impedance) for electrical input attenuation will be inserted between the speaker and the
amplifier, braking by electromagnetic force does not work, and the braking force will be
insufficient outside the use band. Transient characteristics will be degraded. Then, foam rubber
etc. is attached to the back side of the diaphragm as a method of damping the piston vibration
where the high frequency division vibration of the heart and dome and the diaphragm move
together, or a soft sound absorbing material in the space on the back side of the diaphragm.
Although the method of touching the vibration plate and putting it into action and acting as a
braking resistance has been adopted, it was not very effective in improving the frequency
characteristic and the transient characteristic. In order to solve the above-mentioned problems, a
technique (Japanese Patent Application Laid-Open No. 54-150121) has been disclosed in which a
mechanical element is fixed on a diaphragm via a visco-elastic body to thereby prevent split
resonance of the diaphragm. A speaker comprising an elastic material having air permeability
and sound absorption characteristics, which has a disk shape having a central hole, the inner
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periphery thereof is fixed to the outer periphery of the diaphragm, and the outer periphery is
fixed to the frame. In the flat plate speaker, the support member having an outer diameter
smaller than the outer diameter of the plate-like diaphragm and an inner diameter larger than
the outer diameter of the voice coil is formed in the above-mentioned flat shape. A technology
that is configured to be inserted between the diaphragm and the frame, to bond both surfaces, to
prevent the lateral vibration of the diaphragm, and to absorb standing waves between the frame
and the diaphragm No. 181924) and the like, all of which are not suitable for acoustic damping
against piston vibration in which the diaphragm moves as one unit, and frequency characteristics
of a speaker for increasing the equivalent mass of the diaphragm and Transient characteristics
No longer there has been a problem that the cause acoustic distortion.
In order to solve the above-mentioned problems, the inventor of the present invention disclosed a
totally new speaker in Patent Application No. 203425 and the like. That is, it is a speaker
provided with an acoustic resistor formed by filling a soft porous body between a holder or
equalizer provided close to and in parallel with the diaphragm and the diaphragm. Thus, the
speaker has an improvement in transient characteristics due to insufficient braking power of the
speaker, in particular, lack of electromagnetic force generated outside the use band with the
speaker using a network, and piston vibration in which the diaphragm moves integrally By
generating the acoustic braking force for the above, it is possible to significantly improve the
frequency characteristics and the transient characteristics. However, in the above-mentioned
speaker, since an acoustic resistor consisting of a soft porous body is provided between the
diaphragm and the holder or the equalizer, the distance between the holder and the diaphragm
should be considerably large in order to obtain an effective braking force. Therefore, when the
displacement of the diaphragm is increased, the soft porous body is compressed, the density is
increased, and the resistance is increased. That is, when the diaphragm vibrates and the
displacement becomes large, the soft porous body is pressed by this and the density increases,
and the change of the thickness of the soft porous body changes the acoustic resistance value,
causing a problem called distortion. There was a point. SUMMARY OF THE INVENTION The
present invention has been made from the viewpoint of soft soil, and the object of the present
invention is to provide a substantially constant acoustic resistance regardless of the magnitude of
displacement of the diaphragm. It is an object of the present invention to provide a speaker
which can obtain a force and allows the porous substance to follow the vibration of the
diaphragm well and which is easy to manufacture. [Means for Solving the Problems] The object
of the present invention is achieved by forming acoustic resistors provided in these speakers into
a multilayer structure of at least two or more layers of different hardness. [Operation] By
constructing as soft soil, a substantially constant acoustic resistance can be obtained regardless
of the displacement of the diaphragm, and the porous material follows the vibration of the
diaphragm well. , Frequency characteristics and transient characteristics can be greatly
improved. Embodiments of the present invention will be specifically described below with
reference to the drawings. FIG. 1 is a sectional view showing an embodiment of a cone speaker
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according to the present invention, and FIGS. 2 and 3 are sectional views showing an
embodiment of a dome speaker and a pawn speaker, respectively. First, FIG. 1 will be described.
In FIG. 1, ■ is a cone speaker, 2 is a magnet, 3 is a ball piece, 4 is a yoke plate, 5 is a yoke, and
the cone speaker 1 is a magnet 2, a ball piece 3 and a yoke plate 4. The coke 5 constitutes a
magnetic circuit.
6 is a diaphragm, 7 is an edge for supporting the outer periphery of the diaphragm 6, 8 is a
damper for supporting the center 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, 12 is an acoustic resistor attached to the
rear surface of the diaphragm 6, 13 is a soft porous material, and 14 is a hard porous material.
Thus, the acoustic resistor 12 is a combination of the soft porous material 13 and the hard
porous material 14 in at least two layers, each of which is adhered with an adhesive to form a
multilayer structure, and the acoustic resistor 12 is It is arranged to be in contact with the
diaphragm 6, and is fixed by a bracket using a frame of the speaker body or the like. Thus, as
described above, the magnitude of the displacement of the diaphragm 6 is obtained by
combining the acoustic resistor 12 with at least two layers of the soft porous material 13 and the
hard porous material 14 to form a multilayer structure. Regardless of the size, a substantially
constant acoustic resistance can be obtained, and the porous material of the multi-layer structure
is good (follows to the vibration of the diaphragm, so that the degree of adhesion at the time of
vibration is significantly improved. The braking of the vibrating portion and the divided vibration
of the diaphragm can be effectively braked, and the frequency characteristics and the transient
characteristics can be significantly improved. In addition, it is extremely easy to make a work.
The acoustic resistor 12 may be in the form of a ring that continues along one equal line of the
diaphragm 6. Next, an embodiment of the acoustic resistor used for the speaker according to the
present invention will be described. In FIG. 2, 15 is a dome speaker, 16 is a magnet, 17 is a top
plate, 18 is a center ball, 19 is a hack plate, 20 is a diaphragm 21 is an edge, 22 is a voice coil,
and 23 is Reference numeral 24 denotes an equalizer, 25 denotes a bracket, 26.27 denotes a soft
porous material and a hard porous material constituting an acoustic resistor, and 28 denotes a
holder. The dome speaker 15 is disposed and fixed from the center ball 18 via the bracket 25
and the holder 28 so that the acoustic resistor contacts the diaphragm 20 in the same manner as
the cone speaker 1. A dome-shaped holder 28 is provided substantially parallel to the domeshaped diaphragm 20 from the center ball 18 via the bracket 25, and between the diaphragm 20
and the holder 28 as shown in FIG. Similarly, an acoustic resistor is provided in which the soft
porous material 26 and the hard porous material 27 are combined in at least two or more layers,
and each is bonded with an adhesive to form a multilayer structure. As described above, since the
holder 28 is fixed to the center ball 18 via the bracket 25 and does not vibrate at all, only the
portion in the vicinity of the diaphragm 20 of the porous material having a multilayer structure
vibrates, As a result, the volume of the space of the porous material formed into a multilayer
structure changes, and the air in the space flows to repeat the flow out and inflow from the side
surrounding the multi-layered, porous material.
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The viscous drag of the air, which occurs when the air passes through the gaps of the porous
material in a multilayer structure, damps the vibration of the diaphragm 20 and prevents the
transient characteristics. FIG. 3 is a cross-sectional view showing an embodiment of the horn /
speaker according to the present invention. In FIG. 3, 31 is a yoke, 32 is a magnet, 33 is a center
ball, 34 is a yoke plate, 35 is a slot, 36 is an end provided on the throat 35, and the other end has
a large cross section. The formed horn 37.37 'is a diaphragm plate, 38 diaphragms, 38a
diaphragms "1 diaphragm of diaphragm 38, 38b is an edge portion of the diaphragm 38, 38c is a
cylindrical portion of the diaphragm 38, 39 is a voice coil , 40 is an equalizer, 41. 42 is a soft and
hard porous material. Thus, the yoke 31 incorporates a cylindrical magnet 32 at its inner central
axis, the center ball 33 is provided at the tip of the magnet 32, and an annular yoke plate 34 is
provided at one end opening of the yoke 31. The magnet 32, the center ball 33, the yokes 1 and
34, and the yoke 31 constitute a magnetic circuit. The throat 35 is connected at one end thereof
to the horn 6 having a gently enlarged cross-sectional area, and is fixed to the yoke 31 at the
other end via a diaphragm 37.37 ''. A diaphragm 38 composed of a diaphragm 38a is provided
on the front surface of the center ball 33, and the outer peripheral portion of the edge portion
38b is sandwiched and supported between the diaphragms 37. 37 ". The voice coil 39 is
provided on the cylindrical portion 38C of the diaphragm 38 and is located in the magnetic air
gap between the center ball 33 and the yoke plate 34. An equalizer 40 for eliminating phase
interference is provided in front of the diaphragm 38a with a predetermined gap. Thus, in the
present embodiment, the acoustic resistor provided between the equalizer 40 and the diaphragm
38a has a two-layer structure including the soft porous layer 41 and the hard porous layer 42. It
is. Conventionally, in general loudspeakers, an acoustic resistor consisting of a homogeneous soft
porous body is provided between the diaphragm and the holder etc. However, in order to obtain
an effective damping force, the holder etc. Although the distance of the diaphragm must be made
considerably small, the larger the displacement of the diaphragm, the larger the pressure on the
soft porous body, the higher the density, and the higher the resistance, which is a drawback. In
the present invention, since the soft and hard porous materials provided between the diaphragm
20 and the holder are combined to form a multilayer structure, the diaphragm is substantially
constant even if the displacement of the diaphragm becomes large. Acoustic resistance is
obtained.
Since the present invention is configured as a ladder, according to the present invention, a
substantially constant acoustic resistance is always obtained regardless of the magnitude of
displacement of the diaphragm, and vibration of the diaphragm is prevented. Since the porous
material follows well, the adhesion at the time of vibration is improved, and the frequency
characteristics and the transient characteristics can be greatly improved. In particular, the
network used in most speaker systems and the improvement effect with respect to the
deterioration of the transient characteristic of the speaker by use of an attenuator can provide
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the speaker with a very favorable transient characteristic and frequency characteristic. The
configuration of the present invention is not limited to the above embodiment. That is, for
example, in the present embodiment, a two-layer structure is used in which the acoustic resistor
is a combination of one soft porous material and one = 13 hard porous material. It is
recommended not to be limited to a multilayer structure such as a three-layer structure, a fourlayer structure or the like, and generally, the soft porous material be on the diaphragm side, but
this may be reversed. The invention can be freely designed and modified within the scope of the
object, and the present invention embraces all of these modified embodiments.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a sectional view showing an embodiment of a cone speaker according to the present
invention, and FIGS. 2 and 3 are sectional views showing an embodiment of a dome speaker and
a horn speaker, respectively.
1------------------------------------------------------------------------ ---------Yoke plate 5.31-------1-yoke 6.20-------1vibration plate 7.21 ------------Edge 8-----Damper 9.22. 39-Voice coil 10---------Center cap 11------ ----Frame 12------Acoustic Resistor 13.26------Soft porous material 14.27------Hard porous material
15-- -------Dome speaker 17-=---1---------------------------Center ball 19------------ hack· Rate 23-----------Patkin 24.40------Equalizer 25--------------------------------------------------------------------------- --------Holder
3L---------Yoke 35--------Throat 36--=------------------- 37. 37 '---diaphragm pad 3B--------diaphragm
38a---------diaphragm 38 b------ ------Edge part 38 c---------------------------------------------Voice coil 41- --------, ------- soft porous material 42 ---- = ------------ rigid porous material patent applicant Yamazaki
Eiji Agent '7524) Shota Mogami part \ tn (T seventy-two
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