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JPH09187094

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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 JPH09187094
[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. 12, a cone paper, which is the above-mentioned 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 FIG. 13, 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]
By the way, in the speaker apparatus as described above, particularly in the small-sized speaker
apparatus, in order to improve the high frequency characteristic, the central portion (the top
portion) of the above-mentioned cone paper 101 It is conceivable to increase the stiffness of the
In order to increase the stiffness of the central portion of the corn paper 101, if the inclination
angle of the central portion of the corn paper 101 is constant, the rigidity of the corn paper 101
is increased or the thickness is increased. The thing is done.
[0008]
However, in such a cone paper, it is difficult to make sufficient sound reproduction possible for a
wide frequency band by making the internal loss in the cone paper sufficient for a wide
frequency band.
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2
[0009]
Therefore, the present invention is proposed in view of the above-mentioned situation, and the
internal loss in the cone paper is made sufficient for a wide frequency band, and good sound
reproduction can be performed for a wide frequency band. It is an object of the present invention
to solve the problem of providing a speaker device.
[0010]
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. The magnetic gap portion includes
a magnetic circuit for positioning the voice coil, and the diaphragm is provided in a plurality of
substantially concentric circular portions extending from the inner peripheral portion near the
voice coil toward the outer peripheral portion. These parts are divided, and the internal sound
speed is higher at the inner peripheral part than at the outer peripheral part.
[0011]
Further, according to the present invention, in the above speaker device, each portion of the
diaphragm is formed of different materials.
[0012]
Still further, according to the present invention, in the above speaker device, the diaphragm is
formed of a pulp having a higher degree of beating toward the inner peripheral portion.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
[0014]
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.
[0015]
The magnetic circuit has a disk-shaped yoke 11 made of a magnetic material, and an annular
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3
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.
[0016]
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
circumferential surface of the tip end of the center pole 13 face each other to form a magnetic
gap 16.
[0017]
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.
[0018]
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.
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[0019]
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.
[0020]
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.
[0021]
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.
[0022]
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.
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[0023]
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.
[0024]
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.
[0025]
The cone sheets 1 and 2 are divided into a plurality of substantially concentric circular portions
extending from the inner peripheral portion near the voice coil 8 toward the outer peripheral
side.
That is, the cone sheets 1 and 2 are an inner peripheral cone sheet 1 constituting a central
portion to which the bobbin is attached, and an annular ring continuously connected to the inner
peripheral cone sheet 1 on the outer peripheral side of the inner peripheral cone sheet 1 It is
composed of an outer peripheral cone paper 2 of a shape.
[0026]
The inner sound speed of each of the portions constituting the above-mentioned cone sheets 1
and 2 is higher than that of the portion on the outer peripheral side. That is, the material forming
the inner peripheral cone paper 1 has an internal sound velocity faster than the material forming
the outer peripheral cone paper 2. The fact that the internal sound velocity is fast means that √
(E / ρ) is large, where Young's modulus is E and density is ρ.
[0027]
As described above, in order to make the internal sound speed of the portions on the inner
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6
peripheral side of the material constituting the above-mentioned cone paper 1, 2 faster than the
portions on the outer peripheral side, these portions are made of different materials or different
degrees of repulsion different from each other It can be realized by forming with the pulp of
[0028]
For example, if the inner peripheral corn paper 1 is formed of a material such as honey mata,
hemp, biocellulose, and the outer peripheral corn paper 2 is formed of a material such as kraft
pulp, sulfide or wool-containing pulp, The inner sound velocity can be made faster in the inner
circumferential portion than in the outer circumferential portion.
[0029]
Further, the pulp forming the inner peripheral cone paper 1 has a beating degree of about 25 to
30 degrees, and the pulp forming the outer peripheral cone paper 2 has a beating degree of
about 20 to 25 degrees If so, the internal sound velocity can be made faster in the inner
peripheral portion of the above-mentioned cone paper than in the outer peripheral portion.
[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, those having various beating degrees corresponding to the inner peripheral cone
paper 1 and the outer peripheral cone paper 2 are prepared.
[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
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can make papermaking by mixing a dye and a sizing agent.
[0033]
Next, as shown in FIG. 2, the pulp 23 is stacked on a wire mesh 18 (or punching) in which a
central portion bulges downward from the pulp tank 17 like a cone paper.
The wire mesh 18 is supported at its periphery by a support frame 19.
At this time, the pulp 23 is adsorbed to the wire mesh 18 by suctioning the pulp 23 from the
back side (lower side) of the wire mesh 18 as shown by arrow A in FIG. Dehydrate the water in
23.
[0034]
The upper end portion of the cylindrical member 20 is in contact with the central portion of the
wire mesh 18 from the lower side of the wire mesh 18.
Therefore, the suction by the vacuum pump is performed via the outer peripheral portion of the
wire mesh 18. That is, the pulp 23 adsorbed to the wire mesh 18 at this time is a pulp forming
the outer peripheral cone paper 2. The pulp is not adsorbed to the inward portion of the
cylindrical member 20.
[0035]
Then, as shown in FIG. 3, the pulp 25 forming the inner peripheral cone paper 1 is stacked on
the central portion of the wire mesh 18 through the guide cylinder 24. At this time, as shown by
arrow A in FIG. 3, the pulp 25 is adsorbed to the wire mesh 18 from the back side of the wire
mesh 18 by a vacuum pump, and the pulp 25 is dewatered.
[0036]
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In this manner, the pulp 25 forming the inner peripheral cone paper 1 is deposited on the central
portion (inner peripheral portion) of the wire mesh 18, and the pulp 23 forming the outer
peripheral cone paper 2 on the outer peripheral portion of the wire mesh 18 is Be deposited. The
pulps 25 and 23 are in contact via a circular boundary centered on the center of the wire mesh
18. Each of the pulps 25 and 23 entangles fibers with each other in the wet state at the
boundary.
[0037]
The pulps 25 and 23 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 25 and 23 are joined
to each other at the boundary while their fibers are entangled with each other.
[0038]
The pulps 25 and 23 are formed substantially as the corn paper as shown in FIG. Then, the cone
paper is cut off 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.
[0039]
As shown in FIG. 7, the edge 3 is adhered to the outer peripheral edge portions of the cone
sheets 1 and 2, and further, the gasket 4 is adhered as shown in FIGS.
[0040]
The cone paper in this speaker device may be divided into three parts 34, 35, 36 from the inner
periphery toward the outer periphery as shown in FIG.
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Furthermore, the cone paper in this speaker device may be divided into four or more parts from
the inner peripheral side toward the outer peripheral side.
[0041]
Also in these cases, the above-mentioned corn paper is formed from different materials
sequentially from the outer peripheral side or pulp with different beating degrees, and the inner
peripheral portion has a faster internal sound velocity than the outer peripheral portion. It is
made and formed.
[0042]
In addition, the cone paper of this speaker device is made once for the entire cone paper, and
then it is further made only for the central portion of the corn paper so that only the central
portion is made twice. You may form.
[0043]
In addition, although it is possible to attach the corn paper which consists of different materials
by adhesion only to the central part of the above-mentioned corn paper, as mentioned above, the
direction which joined each corn paper in the papermaking process does not require the process
of adhesion. So it is easy to create.
[0044]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The speaker apparatus according
to the present invention having the configuration as described above was produced, and
frequency characteristics over 50 Hz to 20000 Hz or more were measured as shown in FIG.
In this speaker device, the outer diameter of the outer peripheral cone paper 2 (that is, the outer
diameter of the entire cone paper) is 43 mm, and the outer diameter of the inner peripheral cone
paper 1 is 26 mm.
Moreover, this speaker apparatus formed the said inner peripheral cone paper 1 by biocellulose.
[0045]
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10
The frequency characteristic of this speaker device is compared with the frequency characteristic
of the conventional speaker device shown in FIG.
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.
[0046]
The frequency characteristic of the speaker device according to the present invention is
improved over the conventional speaker device in the high frequency characteristic of 10000 Hz
or more as shown in FIGS.
[0047]
Further, in the speaker device according to the present invention, not only the central part (top
part) of the cone paper but also the rigidity of the whole cone paper is high, and the driving force
of the voice coil 8 is low also for low frequency. It was found that the sound was sufficiently
transmitted to the corn paper and the sound quality was improved.
[0048]
As described above, in the speaker device according to the present invention, the internal sound
speed is made faster in the inner peripheral portion of the cone paper than in the outer
peripheral portion, so that particularly high frequency band can be obtained. By improving the
frequency characteristics and increasing the rigidity of the entire cone paper, the driving force of
the voice coil is sufficiently transmitted to the cone paper also for the low frequency, and the
sound quality is improved.
[0049]
That is, the present invention can provide a speaker device in which the internal loss in the cone
paper is made sufficient for a wide frequency band and good sound reproduction can be
performed for a wide frequency band.
[0050]
Brief description of the drawings
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11
[0051]
1 is a longitudinal sectional view showing the configuration of the speaker device according to
the present invention.
[0052]
2 is a longitudinal sectional view showing a first manufacturing process of cone paper of the
above speaker device.
[0053]
3 is a longitudinal sectional view showing a second manufacturing process of the cone paper of
the above speaker device.
[0054]
4 is a longitudinal sectional view showing a third manufacturing process of the cone paper of the
above speaker device.
[0055]
5 is a longitudinal sectional view showing a fourth manufacturing process of the cone paper of
the speaker device.
[0056]
6 is a longitudinal sectional view showing the shape of the cone paper of the above speaker
device.
[0057]
7 is a longitudinal sectional view showing the shape of the main part of the cone paper and the
edge of the above speaker device.
[0058]
8 is a longitudinal sectional view showing the shape of the cone paper and the edge of the above
speaker device.
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[0059]
9 is a perspective view showing the shape of the cone paper and the edge of the above speaker
device.
[0060]
10 is a graph showing the frequency characteristics of the above speaker device.
[0061]
11 is a perspective view showing another example of the configuration of the cone paper of the
above speaker device.
[0062]
12 is a longitudinal sectional view showing the configuration of the cone paper and the edge of
the conventional speaker device.
[0063]
13 is a perspective view showing the configuration of the cone paper and the edge of the
conventional speaker device.
[0064]
14 is a graph showing the frequency characteristics of the conventional speaker device.
[0065]
Explanation of sign
[0066]
Reference Signs List 1 inner circumferential cone paper 2 outer circumferential cone paper 5 cap
8 voice coil 9 plate 10 magnet 11 yoke 13 center pole portion 16 magnetic gap portion
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