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JPH10294986

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DESCRIPTION JPH10294986
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
improvement of a compact loudspeaker having two dampers.
[0002]
2. Description of the Related Art Conventionally, in a large-sized speaker, holding of a vibration
system by two or double dampers in order to hold a large diaphragm and a vibration system is
carried out. It is disclosed by Unexamined-Japanese-Patent No. 3-49000, Unexamined-JapanesePatent No. 62-216497, etc., and is well-known.
[0003]
FIG. 5 shows a side cross-sectional view of a double damper speaker 20 using a flat cone as
disclosed in JP-A-62-216495.
In FIG. 5, the yoke 4 is a plate material made of pure iron or the like formed in a substantially
disk shape, and a columnar center pole 4a is provided upright in the vicinity of the central
portion of the disk plate material.
[0004]
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1
A concentric magnet such as ferrite is magnetized in the thickness direction, and is bonded to the
vicinity of the outer periphery of the plate material of the yoke 4 via an adhesive. On the upper
surface of the magnet 3, a plate 1 having a through hole in the center of a concentric circle is
similarly bonded with an adhesive or the like, and the frame 7 is fixed on the plate 1 by brazing
or the like. The frame 7 is formed of a steel material or the like in a funnel shape, and a step 7a is
formed as necessary.
[0005]
The lower damper 9a holds the voice coil 8a which is wound around the voice coil bobbin 8 in a
magnetic gap 17 formed between the inner diameter of the through hole formed at the center of
the plate 1 and the outer diameter of the center pole. In the case of the flat speaker 21, the voice
coil bobbin 8 is extended upward because the mass of the cone is larger than that of the funnel
cone, and the funnel is formed on the outer periphery of the voice coil bobbin 8. The maximum
diameter portion of the coupling cone 22 is joined to the lower surface of the flat plate cone 21,
and the maximum diameter portion of the flat plate cone 21 is framed via the edge 13. 7, and the
coupling cone 22 is formed between the step portion 7a formed in the middle portion of the
frame 7 and the middle portion of the coupling cone 22. It has been made and swingably held
speaker 20 the mass of the large plate type cone 21 by the damper 9b on engaged.
[0006]
In the conventional large-sized speaker, the upper and lower double dampers are configured to
be supported between the voice coil bobbin 8 and the frame 7 as in the above-mentioned
publications besides the configuration of FIG. .
However, when considering a small speaker, in a small speaker, the magnetic force of the
magnetic circuit is weak and the radiation power in the low region and the resonance sharpness
(Q) at resonance of the low region resonance frequency f0 are large, and the low region is
radiated. Was difficult. In addition, since the aperture is small in a small-sized speaker, it is also
difficult to radiate sound pressure to a high frequency and to use it as a speaker for the entire
band. Therefore, in order to obtain a sufficiently low frequency without dropping the sound
pressure in the low frequency, it was necessary to make the damper highly compliant and to
make the edge highly compliant.
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2
[0007]
However, in a small speaker, the gap length of the magnetic gap 17 of the magnetic circuit is so
narrow that the voice coil 8a abuts against the inner diameter of the plate 1 or the side of the
outer diameter of the center pole 4a to generate a burr. There was a problem.
[0008]
The problem of hitting of the voice coil 8a like a sickle is an unavoidable problem due to the
inhomogeneity of a support system such as a damper and the inhomogeneity of a drive system.
Therefore, as a matter of course, it is considered to use a double damper as a method to improve
the nonuniformity of the damper, and even with a small speaker, a somewhat larger speaker has
a double damper structure as shown in FIG. Not only the frame of the speaker has a double
damper structure, but with such a structure, the outer diameter of the lower damper 9a is
reduced, which causes a problem in lowering the minimum resonance frequency f0.
[0009]
The present invention is intended to provide a double-dampered speaker suitable for a smallsized speaker in which the above-mentioned problems have been solved, and the problem to be
solved by the present invention is that the frame structure does not face the double damper Even
if it is another structure, it is an object of the present invention to obtain a small speaker capable
of double damper structure without reducing the outer diameter of the lower damper 9a.
[0010]
SUMMARY OF THE INVENTION The speaker according to the present invention, as the example
of which is shown in FIG. 1, comprises voices in a speaker adapted to support a vibration system
using two dampers. The coil 8a extends downward from the magnetic gap 17, and has a vibration
system configured to increase thin flow resistance between the voice coil bobbin 8 and the center
pole 4a, and this vibration system is outside the upper portion of the voice coil bobbin 8. It is
configured to be swingably supported by the lower damper 9a disposed between the diameter
and the bottom surface of the frame 7a, and the upper damper 9b disposed between the vicinity
of the middle portion of the outer periphery of the cone 10 and the vicinity of the middle portion
of the frame 7. ing.
[0011]
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3
According to the supporting method of the cone 10 by the double damper as described above,
even if it is the frame 7 of the small speaker, the characteristics of the low range can be matched
to the desired characteristics without reducing the outer diameter of the lower damper 9a. Can
provide an improved speaker.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION A loudspeaker according to the present
invention will be described in detail below with reference to FIGS.
The parts corresponding to the speakers described in detail in FIG. 5 are denoted by the same
reference numerals.
FIG. 1 is a side sectional view showing a method for mounting a double damper of the speaker of
this embodiment.
[0013]
The configuration of the small speaker 20 of this embodiment will be described in detail with
reference to FIG.
The speaker of this example is formed of a disk-shaped plate material, and is integrated with a
columnar center pole 4a planted in the center and a magnet guide 4b concentrically formed with
a stepped portion so as to surround the center pole 4a. A yoke 4 having an inverted T-shaped
cross section, a ring-shaped magnet 3 magnetized in the thickness direction and an inner
diameter fitted and joined to a magnet guide 4b of the yoke 4 and an upper surface of the
magnet 3 The magnetic circuit of the metal part is constituted by the ring-shaped plate 1 joined
by an adhesive or the like and the funnel-shaped frame 7 made of steel or the like fixed on the
plate 1.
[0014]
A state in which a spacer such as kraft paper is wound around the inner periphery of the voice
coil bobbin 8 in order to insert the voice coil 8a wound around the voice coil bobbin 8 in the
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4
concentric magnetic gap 17 between the center pole 4a and the plate 1 Then, the voice coil
bobbin 8 is inserted into the center pole 4 a from the upper side, and the position of the voice
coil 8 a is set so as to be disposed in the magnetic gap 17.
[0015]
The voice coil bobbin 8 of this example is extended by a length L in the space 18 in the
downward winding position of the voice coil 8a as compared with a normal voice coil bobbin for
a small speaker.
Therefore, the air resistance (thin flow resistance) at the time of bobbin vibration generated in a
narrow gap between the inner diameter of the voice coil bobbin 8 and the outer diameter of the
center pole 4a is larger than that of a normal small speaker, and the acoustic impedance Z is
large. To be configured to
[0016]
A corrugated concentric lower damper 9b is bonded between the outer diameter of the upper
end of the voice coil bobbin 8 and the bottom of the frame 7 with an adhesive or the like, and in
the middle of the funnel cone 10 (10a and 10b). The inner diameter portion of the joined cone
10 of the upper damper 9b is fitted to the outer diameter of the upper end portion of the voice
coil bobbin 8 and joined, and the cone maximum diameter portion is joined to the maximum
diameter opening of the frame 7 via the arrowhead 12 Do. Damper Further, the outer diameter
portion of the upper damper 9b is joined to the inner periphery of the middle portion of the
frame 7, and after drying the adhesive, the spacer inserted into the inner diameter of the voice
coil bobbin 8 is removed and the dust preventing cap 14 is made of the voice coil bobbin 8 Bond
to the top.
[0017]
The lead wire from the voice coil 8a is connected to the input terminal 15 via the tinsel wire 16,
and an acoustic signal is supplied to the voice coil 8a via the input terminal 15. Although the
case where the magnet 3 magnetized in advance is assembled has been described above, the nonmagnetized magnet 3 may be magnetized in the final assembly stage.
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[0018]
Since the small speaker of the present invention is configured as described above, the lower side
of the winding portion of the voice coil bobbin 8 is sufficiently extended to make the speaker 20
by thin flow resistance by the thin fluid layer between the voice coil 8a and the center pole 4a.
The low-frequency radiation can be intensified by reducing the resonance sharpness (Q) at the
lowest resonance frequency f0 of. In this case, in order to extend the lower side of the winding
portion of the bobbin 8 of the voice coil 8a, it is necessary to thicken the magnet 3 in
consideration of the amplitude of the speaker 20. It is not necessary to increase the thickness as
the applied electrical input is small. However, even with a small input, the voice coil bobbin 8
becomes long, and the assembling accuracy of the speaker also causes a problem that the voice
coil 8 a hits the vicinity of the magnetic gap 17.
[0019]
Further, in the case of a small speaker having a fixed edge, if the edge 13 is thickened, the
resonance frequency is increased, and the reproduction band in the low region is increased,
which causes a problem in practical use. Since the lower side is extended, the mass of the bobbin
portion L where the hook is extended is added as the weight of the voice coil 8a. Further, by
making the upper and lower dampers 9a and 9b of the support system and the edge 13 highly
compliant, the lowest resonance frequency f0 is lowered.
[0020]
Also, in the small speaker 20 using free edge type cone paper, the sound pressure characteristic
can realize a full band speaker, but the resonance sharpness (Q) at the lowest resonance
frequency f0 is large, and the speaker having a fixed edge There is the same problem as the
above, but since the Q at resonance at the lowest resonance frequency f0 of the speaker 20 can
be reduced by the acoustic impedance of the thin flow resistance, a wide reproduction band
speaker can be realized as a small speaker.
[0021]
As described above, according to this example, it is possible to increase the radiation power of
the low frequency range of the small-sized speaker and freely set the low frequency range
characteristics and the sound quality, to obtain a full band speaker. There is a slight increase in
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6
mass of the voice coil bobbin 8 without dropping, and a double damper with a simple structure
can improve the allowable input, characteristics and sound quality.
[0022]
In the small speaker 20 shown in FIG. 1, the cone 10 is made of ordinary cone paper, and the
inner diameter portion of the upper damper 9b is joined to the middle position of the cone paper
via the adhesive 19. When joining the inner diameter portion of the upper damper 9b to the
outside of the middle portion of the cone 10, as shown in the A portion enlarged view of 1, to the
bonding position of the upper damper 9b from the lowest diameter portion of the cone 10 to the
middle portion , Material of the cone 10a, or density and material or density of the cone 10b
from the middle part to the maximum diameter part of the cone 10 gradually or in the middle
part, suitable for emitting high sound from the cone 10a side It is possible to select it as the
material and to select the cone 10b side suitable for low to middle sound.
[0023]
FIG. 2 shows another configuration example of the small-sized speaker according to the present
invention, and the corresponding parts to FIG. 1 are given the same reference numerals and
redundant explanations are omitted, and only points different in configuration from FIG.
[0024]
In FIG. 1, a step 7a is formed in the middle of the funnel-shaped portion of the frame 7, and the
outer peripheral portion of the concentric upper damper 9b formed in a wave shape is joined to
the step 7b via an adhesive 19. .
[0025]
The cone 10 changes the funnel-like inclination angle of the inner cone 10a and the outer cone
10b at the junction point of the upper damper 7b as shown in the enlarged view of B part in FIG.
The cone 10b is a speaker cone for medium bass, and the adhesive 19 at the bonding point of the
outer peripheral portion of the displacement point of the inclination angle of the upper damper
9b and the inner cone 10a and the outer cone 10b is a high sound (inner) cone It is a case where
it is made to be an edge part.
Of course, also in the case of the speaker of this configuration, the bobbin 8 is extended to the
lower side in the space portion 18.
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[0026]
With this configuration, the two-way speaker can be configured as a single cone, and the
diameter of the lower damper 9a can be unchanged as the high-noise damper, and the upper
damper 9b can be joined very easily.
[0027]
FIG. 3 shows a small speaker of still another configuration of this example, and in this case also,
only the differences from FIG. 1 will be described in detail.
In FIG. 3, the inner cone 10a and the outer cone 10b are completely separated.
The inner cone 10a is formed by joining the inner diameter portion of a high-tone cone formed in
a funnel shape to the upper outer diameter portion of the voice coil bobbin 8, and made of
biocellose, foam mica, metal sinter, etc. Select high quality material to improve high frequency
characteristics and sound quality.
A rising portion 23 is formed at the tip of the inner cone 10a, the inner diameter portion of the
upper damper 9b is joined to the lower end of the rising portion 23 via an adhesive, and the
outer diameter portion of the upper damper 9b is a step portion of the frame 7 It is joined to 7a.
[0028]
Furthermore, the inner diameter portion of the outer cone 10b made of funnel-shaped lowmedium noise paper or the like is joined to the upper portion of the rising portion 23 of the inner
cone 10a via an adhesive, and the maximum diameter portion of the outer cone 10b having the
edge 13 Is joined to the periphery of the maximum diameter opening of the frame 7 via the
arrowhead 12.
In addition, the bobbin 8 is extended to the space 18 and given a predetermined mass and
mechanical resistance.
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8
[0029]
According to the above construction, the mounting method of the upper damper 9b is extremely
simple, and the conventional construction can be used without making the lower damper 9a
smaller.
Further, by selecting a material having a large Young's modulus E and a small E / P for the hightone inner cone 10a, it is possible to obtain one that can improve the sound quality of the hightone characteristics.
[0030]
FIG. 4 shows a small speaker 20 showing still another configuration of the present invention, and
in the case of this example, the upper damper 9b is also used as the high-tone cone 10a.
[0031]
The upper damper 9b and the high-tone cone 10b which is also used as the upper damper 9b
have a funnel-like shape and a central hole is formed in the inner diameter portion thereof. The
inner diameter portion is joined to the upper end of the upper voice coil 8 of the lower damper
10b The outer diameter portion is joined to the inner step 7 of the middle portion of the frame 7.
Furthermore, the lower part than the winding part of the voice coil 8b of the voice coil bobbin 8
is extended into the space 18 to increase the thin flow resistance to increase the acoustic
impedance Z of the vibration system and to resonate at the resonance frequency f0. Dump Q.
[0032]
The inner cone, that is, the high-tone cone 10a which is also used as the upper damper 9b
constituting the high-tone cone, is made of a material that can be used as a soft damper, coated
with a damping material on its surface, and impregnated with thermosetting resin etc. You can
do it.
02-05-2019
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[0033]
In such a configuration, a coaxial type 2-way speaker having a wide reproduction band can be
obtained simply by adding a high-tone cone which is also used as an upper damper to a
conventional small-sized speaker, and the low frequency characteristic is adjusted to the desired
characteristic. Thus, it is possible to obtain a small speaker having a relatively large allowable
input.
[0034]
According to the speaker of the present invention, even if it is a frame of a small speaker not
suitable for the double damper, etc., the double damper can be constructed without reducing the
size of the lower damper.
Also, since the voice coil bobbin is extended to the space portion 18 and the acoustic impedance
is changed to dump Q at the resonance of the low band resonance frequency f0, the speaker
which can be adjusted according to the purpose of the low band characteristics It can be easily
obtained.
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