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JPH09187095

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH09187095
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
technical field of a speaker device for converting an electrical signal into sound.
[0002]
2. Description of the Related Art A voice circuit comprising a magnetic circuit, a voice coil
disposed in the magnetic gap of the magnetic circuit and movably disposed, and a diaphragm
attached to the voice coil. A speaker device has been proposed that converts an electrical signal
supplied to a coil into a sound generated by the vibration of the diaphragm.
[0003]
Such a speaker device is referred to as a conductive speaker.
In this conductive type speaker device, the voice coil is supplied with an electric signal to move in
the magnetic flux in the magnetic gap along with the diaphragm to vibrate the diaphragm.
[0004]
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1
As shown in FIG. 19, the cone paper, which is the diaphragm, is formed of a material having a
uniform thickness such as paper, and has a shape that forms a circumferential surface of a cone.
An opening 105 is formed at the center of the cone paper 101.
[0005]
Then, as shown in FIGS. 20 and 21, the voice coil is attached to the central portion of the cone
paper 101, which is the diaphragm, through a bobbin formed in a cylindrical shape from an
insulating material. The voice coil 104 is wound around the outer peripheral surface portion of
the bobbin. That is, the voice coil 104 has its front end attached to the rear surface of the central
portion of the cone paper 101. The voice coil 104 is in a state of being protruded rearward from
the cone paper 101.
[0006]
The cone paper 101 has its outer peripheral edge supported by the frame of the magnetic circuit
unit via the flexible edge 102 to position the voice coil 104 in the magnetic gap of the magnetic
circuit unit.
[0007]
In addition, in the cone paper 101 of the conventional speaker device, as shown in FIG. 22, a
conical shape is obtained by joining the both sides of the missing portion with an adhesive
margin 106 using an annular paper which is partially lost. There is a shape.
Also in this corn paper, it has a substantially uniform thickness as a whole.
[0008]
By the way, in the above-mentioned speaker device, particularly in the small-sized speaker
device, in order to improve the sound quality of the reproduction sound, the weight reduction
and high rigidity of the above-mentioned cone paper 101 are made. It is possible to Further, in
order to improve the sound quality, it is conceivable to make the magnetic force generated by the
magnetic circuit stronger.
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[0009]
However, all of these measures lead to an increase in the size of the configuration of the speaker
device and a difficulty in manufacturing.
[0010]
Moreover, in the above-mentioned speaker apparatus, improvement of directivity is difficult.
This directional characteristic indicates the degree of deterioration of the sound quality when the
reproduced sound is heard at a position deviated from the front position of the speaker device.
That is, in the above-mentioned speaker device, it is difficult to radiate a sound with good sound
quality over a wide angle range centered on the speaker device.
[0011]
Therefore, the present invention is proposed in view of the above-mentioned situation, and the
improvement of the sound quality of the reproduced sound and the improvement of the
directivity characteristic can be achieved without causing the enlargement of the device
configuration or the difficulty of manufacturing. It is an object of the present invention to solve
the problem of providing a speaker device.
[0012]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a speaker
device according to the present invention comprises a diaphragm, a voice coil attached to a
central portion of the diaphragm, and a magnetic gap portion. And a magnetic circuit for
positioning the voice coil in a magnetic gap portion, wherein the diaphragm is divided into a
plurality of portions arranged via a radial boundary centering on a central portion of the
diaphragm. These parts are supposed to be different in split resonance frequency.
[0013]
A speaker device according to the present invention includes a diaphragm, a voice coil attached
to a central portion of the diaphragm, and a magnetic circuit having a magnetic gap and
positioning the voice coil in the magnetic gap. And the diaphragm has a plurality of discrete parts
arranged discretely, and these parts have mutually different split resonance frequencies, and
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symmetrical positions centering on the central part of the diaphragm. The divided resonance
frequencies are supposed to be different from each other.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
[0015]
As shown in FIG. 1, the speaker device according to the present invention is configured to include
a magnetic circuit and a frame 6 disposed on the magnetic circuit.
[0016]
The magnetic circuit has a disk-shaped yoke 11 made of a magnetic material, and an annular
magnet 10 fixed to the front surface of the yoke 11.
At the center of the front surface of the yoke 11, a cylindrical center pole portion 13 is integrally
protruded.
The center pole portion 13 is coaxial with the magnet 10 and enters the central through hole
portion of the magnet 10.
[0017]
On the front surface of the magnet 10, a disk-shaped plate 9 having a through hole at its central
portion is attached.
The tip end side portion of the center pole portion 13 is inserted into the through hole in the
central portion of the plate 9.
The inner circumferential surface of the through hole at the center of the plate 9 and the outer
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circumferential surface of the tip end of the center pole 13 face each other to form a magnetic
gap 16.
[0018]
The frame 6 is made of a material having sufficient rigidity, such as metal, and is formed in a
cylindrical shape whose front end side is expanded in a substantially conical shape, and its rear
end side portion is fixed to the front surface portion of the plate 9.
[0019]
In the holding portion on the front end side of the frame 6, the peripheral portion of the cone
paper 1, 2 serving as a diaphragm is attached with a gasket 4 via an edge 3.
The edge 3 is formed with flexibility and is displaceable in the front-rear direction.
[0020]
The above-mentioned cone paper sheets 1 and 2 are composed of a substantially conical cone
portion and a dome-shaped cap 5 attached to the cone portion so as to close the through hole at
the central portion of the cone portion. .
The peripheral portion of the cone portion is joined to the edge 3.
[0021]
A bobbin is attached to the central part of the cone paper 1 and 2 toward the rear side. The
bobbin is formed in a cylindrical shape, and its front end is attached to the center of the cone
paper 1 and 2.
[0022]
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It is desirable that the bobbin be formed lightweight while having high rigidity. Therefore, it is
desirable that the bobbin be formed by rounding a synthetic resin material such as Bakelite
board, paper or cloth impregnated with epoxy resin, glass-epoxy board (glass fiber material
solidified with epoxy resin), etc. into a cylindrical shape. Also, the bobbin may be formed of a
metal plate, paper or the like.
[0023]
The voice coil 8 is bonded to the outer peripheral surface of the bobbin. The voice coil 8 has a
tinsel wire (lead wire) 14 and is wound and formed in a cylindrical shape. The tinsel cord 14 is
connected to an input terminal 15 provided on the frame 6 via a support member.
[0024]
The voice coil 8 is located in the magnetic gap 16. That is, the voice coil 8 is coaxial with the
center pole portion 13 and enters between the center pole portion 13 and the inner surface of
the through hole at the central portion of the plate 9.
[0025]
The front end side portion of the bobbin is connected to and supported by the rear end side
portion of the frame 6 via a flexible and vibration absorbing damper 7.
[0026]
The cone sheets 1 and 2 are, as shown in FIG. 10, a plurality of portions arranged via radial
boundaries centered on the central portions of the cone sheets 1 and 2 which are in the vicinity
of the voice coil 8 That is, it is divided into a substantially semicircular first cone paper 1 and a
second cone 2 respectively.
The respective divided resonance frequencies of the cone sheets 1 and 2 are different from each
other. In order to make the above-mentioned respective cone papers 1 and 2 different from each
other in dividing resonance frequency, it is possible to change their weight, to change their
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thickness, to change their Young's modulus, or to use different materials or pulps having
different freeness. This can be realized by forming the
[0027]
Further, as shown in FIG. 11, the above-mentioned corn paper is, as shown in FIG. 11, three parts
arranged via a radial boundary centering on the central part of this corn paper, ie, approximately
fan having an opening angle of 120 °. The mold may be divided into semicircular first to third
cone sheets 1, 2, 37.
[0028]
Furthermore, as shown in FIG. 12, the above-mentioned corn paper is, as shown in FIG. 12, four
parts arranged via a radial boundary centered on the central part of this corn paper, ie,
approximately fan having an opening angle of 90.degree. The mold may be divided into
semicircular first to fourth cone sheets 1, 2, 37, 38.
[0029]
Then, as shown in FIG. 13, the above-mentioned corn paper has a plurality of divided portions 2,
37, 38, 39 discretely arranged in the circular area 1 as a base, and each of these portions is The
split resonance frequencies may be different from one another.
At this time, in the cone paper, the divided resonance frequencies are made to be different from
each other at symmetrical positions about the center of the cone paper.
That is, the divided portions having the same divided resonance frequency are not formed at
symmetrical positions with the central portion of the above-mentioned cone paper as a center.
[0030]
Such corn paper 1 and 2 can be prepared by the following process. That is, first, the pulp to be
the material of the above-mentioned corn paper is beaten with a beater to obtain a desired
beatiness. At this time, pulps having various beating degrees corresponding to the abovementioned respective corn papers 1, 2 or the above-mentioned divided portions 37, 38, 39 are
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prepared. In addition, the degree of beating may be the same for each of the cone sheets 1 and 2
or the divided portions 37, 38, and 39.
[0031]
In addition, in the case of mixing different materials or different kinds of pulp in the pulp, after
the pulp is beaten with a beater, the different materials or different kinds of pulp are mixed in the
beater or the pulp tank.
[0032]
And the said pulp is made into a pulp solution of the density | concentration of the grade which
can make papermaking by mixing a dye and a sizing agent.
[0033]
Next, as shown in FIG. 2 and FIG. 9, the pulp 23, 25 is put on the wire mesh 18 (or punching) in
which the central part bulges downward as in the shape of cone paper from the pulp tank (not
shown). I will pile up.
The wire mesh 18 is supported at its periphery by a support frame 19.
At this time, as shown by arrow A in FIG. 2 from the back side (lower side) of the wire mesh 18,
the pulp 23, 25 is adsorbed to the wire mesh 18 by suctioning the pulp 23, 25 with a vacuum
pump. At the same time, the water in the pulp 23, 25 is dewatered.
[0034]
The suction path by the vacuum pump is divided into an area to be the first cone paper 1 and an
area to be the second cone paper 2. And, as shown in FIG. 9, the wire mesh 18 is supported by a
support beam 34 at a portion corresponding to the boundary of the respective regions. The
upper portion of the support beam 34 is sharpened in the shape of a knife edge so as to reduce
the contact area with the wire mesh 18.
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[0035]
The area to be the first cone paper 1 is sucked through the through holes 35 of the inner frame
provided in the support frame 19 as shown by the arrow E in FIG. Further, as shown by the
arrows F and G in FIG. 2, the area to be the second cone paper 2 is sucked through the through
holes 36, 36 of the inner frame. By changing the sizes of the through holes 35, 36, the suction
force can be changed mutually in the area to be the above-mentioned respective cone sheets 1, 2.
[0036]
Since the suction forces are different between the regions to be the above-mentioned corn paper
1 and 2, the amounts of the pulps 23 and 25 deposited on the respective regions are different
from each other as shown in FIG. 9. As described above, even when the beating degrees of these
pulps are equal to each other by making the amounts of the pulps 23 and 25 deposited in the
area to be the respective corn papers 1 and 2 different from each other, the respective corn
papers 1 and 2 are obtained. 2 is formed as cone paper which is different in weight from each
other and different in divided resonance frequency.
[0037]
The pulps 23 and 25 are in contact via radial boundaries centered on the center of the wire mesh
18. Each of the pulps 23 and 25 entangles fibers with each other in the wet state at the
boundary.
[0038]
The pulps 23 and 25 are heated to about 200 ° C. by the heater 28 on the wire mesh 18 and
pressurized (pressed) by the molding die 29, as shown in FIG. The mold 29 has a conical
projection 30 corresponding to the shape of the wire mesh 18. The forming die 29 cooperates
with the wire mesh 18 by fitting the projection 30 into the recess formed by the wire mesh 18 as
shown by the arrow D in FIG. Pressurize across the At this time, the pulps 23 and 25 are joined
to each other at the boundary while their fibers are entangled with each other.
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[0039]
The amount of pulp in the region where the amount of pulp is large when pressed by the
molding die 29 in a state in which the amounts of pulp 23, 25 which become the respective corn
paper 1, 2 differ from one another and differ in weight and thickness The pressure increases and
the density and Young's modulus become larger than in the region where there is less.
[0040]
And each said pulp 23 and 25 is formed substantially as said corn paper, as shown in FIG.
Then, the cone paper is cut at the peripheral portion 31 and the central portion 32 to become
cone paper 1 and 2 of a predetermined shape as shown in FIG.
[0041]
As shown in FIGS. 6 and 16, the edge 3 is adhered to the outer peripheral edge portions of the
cone sheets 1 and 2, and the gasket 4 is further adhered as shown in FIGS. 7 and 8.
[0042]
Also, from the corn paper, the three portions consisting of the first to third corn paper 1, 2, 37
and the first to fourth corn paper 1, 2, 37, 38 as described above Even in the case of forming a
plurality of divided portions 2, 37, 38, 39 arranged discretely, the above-mentioned wire mesh
18 may be formed on each of the divided portions in the same manner as the process described
above. It may be divided correspondingly and suctioned by the vacuum pump.
[0043]
Also in these cases, the corn paper is formed with different weight and Young's modulus for each
of the divided portions.
When the divided portions are formed by papermaking using different materials or pulps having
different degrees of beating, the supply of pulp from the pulp tank onto the wire mesh 18 is
performed using each material or each pulp. At this time, each material or pulp is deposited only
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in a corresponding predetermined area by masking on the wire mesh 18 or the like.
[0044]
In addition, the cone paper of this speaker device is provided with projections and recesses
corresponding to the above-described areas in the projecting portion 30 of the molding die 29,
and the Young's modulus in each of the areas can be obtained Can differ from one another.
[0045]
Further, as shown in FIGS. 14 and 15, the cone paper of this speaker device is composed of a
plurality of fan-shaped contact pieces 40, and a glue strip piece projected to one side from each
of the contact pieces 40. 42 may be adhered to the other side portion 41 of the adjacent contact
piece 40.
[0046]
In this case, the divided resonance frequency is different from that of the other portion due to the
increase in weight of the portion to which the adhesive strip 42 is adhered.
Thus, as shown in FIG. 15, the portions to which the adhesive strip pieces 42 are adhered are
arranged radially about the central portion of the corn paper.
[0047]
EXAMPLE A speaker device according to the present invention having the above-mentioned
configuration is fabricated, and as shown in FIG. 18, the frequency characteristic over 50 Hz to
20000 Hz is shown as in FIG. The 30 ° characteristic and the 60 ° characteristic were
measured.
[0048]
The frequency characteristics of this speaker device are compared with the frequency
characteristics (front characteristics, 30 ° characteristics and 60 ° characteristics) of the
conventional speaker device shown in FIG.
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The conventional speaker device is configured in the same manner as the speaker device
according to the present invention except that cone paper is formed of a uniform material.
[0049]
The frequency characteristics of the speaker device according to the present invention, as shown
in FIG. 18 and FIG. The sound quality and directivity characteristics are improved in that the 60
° characteristics are close to each other.
[0050]
As described above, in the speaker device according to the present invention, the diaphragm is
divided into a plurality of parts arranged via radial boundaries centered on the central part of the
diaphragm, The divided resonance frequencies are different from each other, or the diaphragm
has a plurality of divided parts disposed discretely, and the divided resonance frequencies of the
divided parts are different from each other. Since the split resonance frequencies are mutually
different at symmetrical positions centered on the central portion, the resonance is reduced to
improve the sound quality, and the directivity characteristic is improved.
[0051]
That is, according to the present invention, it is possible to provide a speaker device in which the
sound quality of reproduced sound and the directivity characteristic are improved without
increasing the size of the device configuration or the difficulty of manufacturing.
[0052]
Brief description of the drawings
[0053]
1 is a longitudinal sectional view showing the configuration of the speaker device according to
the present invention.
[0054]
2 is a longitudinal sectional view showing a first manufacturing process of cone paper of the
above speaker device.
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[0055]
3 is a longitudinal sectional view showing a second manufacturing process of the cone paper of
the above speaker device.
[0056]
4 is a longitudinal sectional view showing a third manufacturing process of the cone paper of the
above speaker device.
[0057]
5 is a longitudinal sectional view showing the shape of the cone paper of the above speaker
device.
[0058]
6 is a longitudinal sectional view showing the shape of the main part of the cone paper and the
edge of the above speaker device.
[0059]
7 is a longitudinal sectional view showing the shape of the cone paper and the edge of the above
speaker device.
[0060]
8 is a perspective view showing the shape of the cone paper and the edge of the above speaker
device.
[0061]
9 is a longitudinal sectional view showing the configuration of the main part of the metal mesh
forming the cone paper of the above speaker device.
[0062]
<Figure 10> It is the elevation view which shows the constitution of the cone paper of the abovementioned speaker device.
[0063]
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13
11 is a front view showing another example of the configuration of the cone paper of the above
speaker device.
[0064]
12 is a front view showing still another example of the configuration of the cone paper of the
above speaker device.
[0065]
13 is a front view showing an example in which divided portions are discretely arranged in cone
paper of the above speaker device.
[0066]
FIG. 14 is a developed view of the cone paper in the case where the cone paper of the above
speaker device is laminated.
[0067]
15 is a front view showing cone paper of the above speaker device configured by bonding.
[0068]
16 is a longitudinal sectional view showing the shape of the cone paper and the edge of the
above speaker device.
[0069]
FIG. 17 is a side view showing measurement conditions of directivity characteristics in the above
speaker device.
[0070]
FIG. 18 is a graph showing frequency characteristics of the above speaker device.
[0071]
19 is a longitudinal sectional view showing the configuration of the cone paper and the edge of
the conventional speaker device.
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[0072]
FIG. 20 is a perspective view showing a configuration of cone paper and an edge of the
conventional speaker device.
[0073]
21 is a front view showing the configuration of the cone paper and the edge of the conventional
speaker device.
[0074]
FIG. 22 is a front view showing another example of the configuration of cone paper of the
conventional speaker device.
[0075]
23 is a graph showing the frequency characteristics of the conventional speaker device.
[0076]
Explanation of sign
[0077]
DESCRIPTION OF SYMBOLS 1 1st cone paper 2 2nd cone paper 5 cap 8 voice coil 9 plate 10
magnet 11 yoke 13 center pole part 16 magnetic gap part 37, 38, 39 division part
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