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JP2000354294

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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 JP2000354294
[0001]
TECHNICAL FIELD The present invention relates to a method of manufacturing a speaker and a
speaker manufactured by the method.
[0002]
2. Description of the Related Art FIG. 5 shows a conventional example of a cone type speaker,
wherein A is a frame, B is an edge, C is a damper, D is a cone (diaphragm), E is a voice coil, F is a
voice coil. A permanent magnet, G is a pole, and H is a damper. In the above speaker, by
supplying an electrical signal to the voice coil E, the energy of the electrical signal is converted
into kinetic energy of the cone D. Also, the ultimate goal of the loudspeaker is to convert all of
the input signal into kinetic energy, so ideally it should be infinitely stiff and infinitely light, but
this requirement Naturally, it is impossible to fill, and from the viewpoint of cost, a structure in
which the pulp is cut into a predetermined cone shape, or a predetermined cone by heating the
sheet-like pulp into a plastic state to deform it. It is common to have a shaped structure.
[0003]
By the way, in order to convert all the electrical energy supplied to the voice coil E into kinetic
energy, the motion of the voice coil E is transmitted to the cone D as it is, that is, the cone D is
Although it is ideal to have a good mechanical response to the voice coil E, in the cone applied as
a diaphragm to a conventional speaker, there are various factors that deteriorate the response.
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[0004]
That is, if the cause of the response decrease is estimated, (1) When a sudden large current flows
in the voice coil E, a large acceleration is generated in the cone D. In this case, the cone D is first
shown in FIG. It is deformed as shown by a dashed line, and then, in the same shape as the voice
coil E, it is deformed in the same direction while returning to the original shape.
Therefore, the deformation causes a time delay in the transfer of motion from voice coil E to cone
D, or some of the kinetic energy of voice coil E is consumed as thermal energy by the
deformation of cone D, and the air is transferred to the air. The kinetic energy is not sufficiently
transmitted, which causes a decrease in response.
[0005]
(2) The formed pulp has a complex intertwined fiber orientation in various directions and is
porous (high porosity) normal, so when the cone D vibrates, the voice coil E A deformation that
increases the density of the material inside the cone D (such as reducing the gap between fibers)
by the interference of the vibration diffused in the direction different from the movement
direction or by the movement of the voice coil E in the axial direction Tends to be absorbed and
kinetic energy is absorbed.
[0006]
Then, in order to remove the cause of the above-mentioned response reduction to some extent,
for example, mixing of materials such as plastic, metal or carbon fiber to increase the density of
pulp is performed, but when these are mixed, The weight per unit area of the cone D increases
and efficiency (sound pressure measured at a predetermined distance in front of the speaker
when the predetermined current flows through the voice coil E) decreases, or the lowest
resonance frequency f 0 There is a problem that the
Although the reduction of f0 is not necessarily a defect because the reproduction frequency is
low for the low frequency speaker, it is not a preferable tendency because it is a factor that
impairs the reproduction capability of the high and low frequency range in the middle and high
frequency sound speaker.
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[0007]
The present invention has been proposed in view of the above circumstances, and provides a
speaker manufacturing method capable of improving the response of the speaker without
making a special change in the material of the cone, and a speaker manufactured by the method.
The purpose is to
[0008]
SUMMARY OF THE INVENTION In order to achieve the above object, the speaker manufacturing
method of the present invention is characterized by applying a stress to a diaphragm.
For example, the diaphragm is made to be a curved surface by elastically bending and deforming
the plate body, and the surface on the compression deformation side of the diaphragm is
attached forward.
[0009]
With the above configuration, the stress applied to the diaphragm increases the density of the
surface that directly imparts kinetic energy to air and causes stress in one direction to the tissue
that constitutes the cone, resulting in randomness. The vibration propagating in the direction is
propagated in a certain direction in the direction of the stress. Specifically, the following
manufacturing method is adopted.
[0010]
The arc side of the chordal rib whose one side is formed in a substantially arc shape is made to
face the plate, and first, the end of the rib and the plate are fixed. Thereafter, while the plate is
curved, the rib and the plate are fixed. A plurality of ribs are usually fixed. By adhering in this
manner, stress can be applied to the plate.
[0011]
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Longitudinal beams may be fixed to both sides of the plate in advance. Thereby, the plate can be
curved and fixed to the rib while holding both sides of the plate in a straight line. Further, if the
plate is made of wood and its fibers are fixed in the longitudinal direction of the rib, a larger
internal stress can be given.
[0012]
Furthermore, after the ribs and the plate are fixed, the paint may be applied to one side of the
plate thicker than the other side. The paint shrinks when it is dried, but if the thickness of the
paint is different in this way, stress can be applied to the plate by the difference in the shrinking
force. Note that the paint may not be applied to one side surface. Further, the present invention
can be applied not only to the plate to which the rib is fixed but also to the diaphragm of any
speaker.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a loudspeaker
manufactured by the loudspeaker manufacturing method of the present invention will be
described below. What is indicated by reference numeral 1 in FIG. 1 is a diaphragm. As shown in
FIG. 2, the diaphragm 1 is composed of a curved plate (plate) 2 and flat plates (longitudinal
beams) 3 provided on both sides thereof. The curved plate 2 is curved so that both side portions
are substantially a part of a cylindrical surface, and the central portion has a substantially flat
shape. The flat plate 3 is a part of a plane substantially parallel to the axis of the curved plate 2
and is fixed to both side edges of the curved plate 2.
[0014]
In addition, at both ends and the middle part of the curved plate 2, a horizontal rib having a
plane shape substantially equal to the shape of a cross section orthogonal to the axis of the
curved plate 2 and having one side formed in a substantially arc shape (String-like ribs) 4A to 4D
are fixed. Between the transverse ribs 4A to 4D, longitudinal ribs 5A to 5F directed in a direction
perpendicular to the longitudinal ribs 5A to 5D are provided to mutually connect the transverse
ribs 4A to 4D at respective portions, and the longitudinal ribs 5A to 5F is also fixed to the surface
of the curved plate 2. Furthermore, between the longitudinal ribs 5A and 5B and the curved plate
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2, between the longitudinal ribs 5C and 5D and the curved plate 2, and between the longitudinal
ribs 5E and 5F and the curved plate 2, the curve of the corresponding portion Lateral ribs 6A, 6B,
6C, 6D and 6E, 6F having planar shapes corresponding to the cross-sectional shape of the plate 2
are fixed to form a grid as a whole.
[0015]
It is desirable that the curved plate, the flat plate, and the longitudinal and lateral ribs be
lightweight and have high rigidity, and in the present embodiment, a balsa material is applied. In
addition, these members are combined in such a manner that the direction of the fibers is
directed to the longitudinal direction of the members. Furthermore, in this embodiment, the
curved plate 2 is formed into the illustrated shape by elastically deforming a flat plate as
described later, and this elastic deformation state (a state in which an internal stress is
generated) is maintained. A structure in which each rib is fixed to the curved plate 2 is adopted.
In addition, as a fixing means of the said rib, any of an adhesive agent or mechanical means like a
bolt and a nut is applicable.
[0016]
The diaphragm 1 having the above-described configuration is disposed inside the frame 7 as
shown in FIG. 2, and the outer periphery of the diaphragm 1, that is, the flat plates 3 and 3 on
both sides and the upper and lower horizontal ribs Between the 4A and 4D and the inner
periphery of the frame member 7, edge members 8 are provided to block the flow of air
therebetween. For example, a material having a high degree of elasticity and a good vibration
damping property, such as a foamed urethane resin, is applied to seal the space between the
diaphragm 1 and the frame member 7.
[0017]
Further, six drive units 9 are connected to the diaphragm 1. These drive units 9 are disposed
three each on the back surface of both flat plates 3, and act between the voice coil 10 and the
magnet 11 by supplying an electrical signal of the voice coil (moving coil) 10. It functions as
drive means for driving the diaphragm 1 by the electromagnetic force. The magnet 11 is fixed to
the inner surface of the back plate 12 provided on the back surface of the frame member 7.
Furthermore, the voice coil 10 is connected to a frame 13 integral with the magnet 11 via an
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elastically deformable damper 14. Further, the back plate 12 is provided with an opening 12a,
and the space on the back side of the diaphragm 1 is opened so that this space does not become
a closed chamber (a space where air is compressed to generate back pressure). ing.
[0018]
Furthermore, in the figure, reference numeral 15 denotes a reinforcing material that reinforces
the connection portion between the curved plate 2 and the flat plate 3 from the front side in the
vicinity of the connection portion of each drive unit 9; The reinforcing member, numeral 17 is an
opening for providing an auxiliary small speaker (not shown) for high sound, for example. Of
course, the opening 17 may be omitted when the small speaker is not used.
[0019]
Next, the method of bonding the curved plate 2 and the lateral ribs 4A to 4D will be described
with reference to FIG. First, as shown in FIG. 3A, the flat plate 3 is fixed to both side ends of the
curved plate 2. The curved plate 2 is positioned with its fiber direction in the left-right direction.
Next, the horizontal ribs 4A to 4D are arranged at predetermined intervals in the vertical
direction (in the drawing, in the depth direction in the drawing) with the arc side facing the
curved plate 2 and the end thereof at the end of the curved plate 2 Stick. And as shown in FIG.3
(b), the curved plate 2 and horizontal rib 4A-4D are closely_contact | adhered and fixed, making
the curved plate 2 curve. Here, when the flat plate 3 bends the curved plate 2, both side surfaces
thereof are held in a linear shape, and the horizontal ribs 4A to 4D and the curved plate 2
function to be securely fixed.
[0020]
By fixing the curved plate 2 and the lateral ribs 4A to 4D in this manner, the elastically deformed
state (the state in which the internal stress is generated) of the curved plate 2 is maintained.
Since the fiber direction of the curved plate 2 is the left-right direction (rib longitudinal
direction), internal stress is effectively generated. Thereafter, the surface of the curved plate 2 is
coated with a varnish. At this time, the coating film thickness of front and back of the curved
plate 2 is made different, and it paints. The coated varnish shrinks when it is dried, but the
thicker the coating, the more the amount of shrinkage, so that the internal stress can be applied
to the curved plate 2 further.
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[0021]
In the flat speaker configured as described above, the energy of the electric signal is converted
by the drive unit 9 into mechanical energy as reciprocating movement of the voice coil 10
(reciprocation movement in the direction orthogonal to the plane plate 3) and vibration is
generated. The curved plate 2 of the plate 1 can be vibrated to generate musical tones. Further,
as illustrated, a space surrounded by the surface on the front side of the curved plate 2 and the
horizontal ribs 4A to 4D, 6A to 6F and the longitudinal ribs 5A to 5F is formed inside the curved
plate 2 Therefore, the air held in this space is pushed forward of the diaphragm 1.
[0022]
Further, since the diaphragm 1 is in a state of having an internal stress due to elastic
deformation, a compressive stress is generated on the inner surface (the surface facing forward),
the structure becomes dense, and the gap between the structures is narrowed. Such small
deformation is reduced, and the motion of the voice coil 10 can be reproduced as it is, and can be
vibrated with the minimum attenuation amount. Further, the propagation of the vibration in the
fibers of the wood constituting the diaphragm 1 is directional, and the loss due to the
interference of the vibration propagating in the random direction is suppressed. Further, since
the diaphragm 1 is in the form of a curved surface curved around one axis, the left and right in
FIG. 1 are similar to a so-called toned zone (also called a line speaker) in which a plurality of
speakers are arranged in a straight line in the vertical direction. Good directional characteristics
can be obtained in the direction. Therefore, when performing two-channel stereo reproduction,
good stereo reproduction capability can be exhibited by arranging flat speakers directed in the
direction as shown in FIG. 1 side by side in the horizontal direction in FIG.
[0023]
Furthermore, FIGS. 4 and 5 show an example in which the present invention is applied to a cone
type speaker. That is, as described in the prior art, the conventional cone is formed by peeling the
pulp dissolved in water into a predetermined cone-like mesh or by deforming it into a plastic
state by heating. Although internal stress does not occur due to deformation, in this embodiment
a fan-shaped sheet (as material, pulp, wood, plastic, or a composite material of these may be
considered) as shown in FIG. By elastically deforming 20 into a cone shape as shown in FIG. 4
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and by bonding and forming the radially facing edges 20a and 20b of the sheet 20 in a mutually
abutting state, an internal stress is generated I have to.
[0024]
Also in such a cone-shaped diaphragm, as in the case of the one embodiment, it is possible to
expect an improvement in response due to the internal stress state. Furthermore, the surface of
the sheet 20 is coated with a varnish. At this time, the coating film thickness of front and back of
the sheet 20 is made different, and it paints. The painted varnish shrinks when it is dried, but a
thicker paint will have more shrinkage, so that the sheet 20 can be further stressed internally.
[0025]
Here, as shown by a chain line in FIG. 4, instead of a structure in which the edge portions 20a
and 20b are butted and adhered, a tape-like reinforcing material 22 is provided on the front,
back or both of the joint 21 The reinforcing member 22 may be attached to the sheet 20 or may
be joined by mechanical means to join the edge portions 20a and 20b. In addition, the edges 20a
and 20b may be connected to each other in a partially overlapped state. Furthermore, the surface
coating may be performed with a varnish on the front and back surfaces of the cone formed by
plastic deformation. At this time, it is possible to apply internal stress to the cone by applying
different coating thicknesses on the front and back surfaces of the cone.
[0026]
As apparent from the above description, according to the present invention, the density of the
diaphragm of the speaker is increased or the rigidity is enhanced by using the same material,
that is, without mixing other materials. Therefore, the mechanical response to the input signal
can be improved and the tone can be reproduced faithfully, without lowering the efficiency due
to mixing in other materials and lowering the lowest resonance frequency. Play.
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