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JP2008066959

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DESCRIPTION JP2008066959
PROBLEM TO BE SOLVED: To secure a sufficient surface rigidity and suppress a warp without
impairing the formability and mass productivity by press heat forming. [Solution] A laminated
sheet 33 comprising a wood sheet 29 obtained by cutting a wood 27 having a wood grain into a
sheet and a reinforcing sheet 31 laminated to one surface of the wood sheet 29 is provided. A
combined diaphragm of a cross-sectional laminated structure in which a first diaphragm 23 and
a second diaphragm 25 previously formed into a conical shape by a plurality of sheets 33 are
superimposed in the order of a wooden sheet 29, a reinforcing sheet 31, a reinforcing sheet 31,
and a wooden sheet 29 To have a structure. [Selected figure] Figure 1
Speaker, method of manufacturing speaker diaphragm and method of manufacturing voice coil
cover
[0001]
The present invention relates to a speaker using natural wood, a diaphragm for the speaker and a
method of manufacturing a voice coil cover.
[0002]
In recent years, one using natural wood as a material of a diaphragm of a speaker is known.
[0003]
The reason for using wood as the material of the diaphragm is that, in addition to the natural
sound that the wood originally has, the appearance is improved and the effect of giving a high
quality feeling is obtained. It is noted as one of the materials.
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1
[0004]
On the other hand, there are many problems as opposed to natural wood, especially the strength
of the sheet-like wooden sheet and measures against warping.
[0005]
The wood sheet is, for example, as shown in FIG. 8, when the wood sheet 103 is cut in a sheet
form from the log-shaped wood 101, the wood surface 105 (outside with respect to the center of
the wood) and the wood back 107. (With respect to the center of the tree), and as time passes, a
sled occurs toward the wood table 105 as shown.
[0006]
Therefore, as shown in Patent Document 1, a laminated sheet in which a reinforcing sheet 101
such as non-woven fabric or Japanese paper is attached to the wood back surface 107 of the
wood sheet 103 in order to keep the warp small and secure the surface rigidity of the wood
sheet. The means to be taken are taken.
JP 10-304492 A
[0007]
The laminated sheet is formed into, for example, a conical diaphragm by press heat forming, but
the wooden sheet 103 can not be made thicker than necessary when considering the forming
process surface by press heat forming and the surface of mass productivity is the current
situation.
[0008]
Generally, the thickness varies depending on the diameter of the diaphragm, but a thin one with
a thickness of 0.1 mm and a thick one with a diameter of 0.6 mm are used, and means for
suppressing surface rigidity and warpage by using a bonded sheet. Have taken
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Nevertheless, there is a need for adequate sled measures because sledding occurs.
[0009]
As one of the solution methods, a plurality of composite sheets comprising a sliced wood and a
non-woven fabric made of an adhesive resin attached to the back of the sliced wood are disclosed
in JP-A-5-83792. A method of laminating and forming into a curved surface shape, and
laminating at least two sheets of the composite sheet softened and softened, and then heating
and pressing to form an acoustic diaphragm A method of manufacturing is disclosed.
In this method, when forming a thick wooden diaphragm, a plurality of composite sheets
composed of a thin wood and a non-woven fabric made of an adhesive resin attached to the back
surface thereof are laminated to have a predetermined thickness and a curved surface. It is a
method of forming into a cone shape by preventing cracking during molding.
However, if the composite sheet is laminated and bonded before curved surface molding, the
amount of strain applied when curving on wood varies depending on the position of the layer
(for example, in the inner wood layer and the outer wood layer of the cone shape) Even with a
composite sheet, as the thickness increases, distortion may occur on the laminated bonding
surface, which may cause cracking.
Furthermore, since the force of strain is likely to act as a restoring force that tends to return after
molding, there is a possibility that the curved surface shape may be deformed with time.
[0010]
9 (a) shows a conical diaphragm viewed from a plane, FIG. 9 (b) shows an initial state of XX ′
and YY ′, and FIG. 9 (c) shows one composite sheet. The composite sheet of X-X 'and Y-Y' at that
time showed the change over time when the wood grain was crossed 90 degrees, but it was
molded into a curved surface shape by one composite sheet composed of wood and nonwoven
fabric. In the case of the vibrating plate, since the direction of the wood fiber is in one direction,
if it is insufficient for resin impregnation etc., for example, as shown in (c), it changes with time in
only one direction of x or y. In some cases,
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Further, in the above-mentioned Japanese Patent Application Laid-Open No. 5-83792, when it is
desired to increase the mechanical strength of the diaphragm 5, a method of laminating wood
fibers of the composite sheet 4 so as to cross 90 ° in the longitudinal and transverse directions.
However, if the composite sheets made of wood and non-woven fabric are laminated in the same
order, the direction of the wood fibers will be crossed and the force of deformation will be
dispersed, as in (d). In some cases, deformation may occur uniformly in the x and y directions.
[0011]
Therefore, in the present invention, a speaker which is excellent in appearance and is capable of
securing sufficient surface rigidity and suppressing warpage without impairing the formability
and mass productivity by press heating and molding, It is an object of the present invention to
provide a method of manufacturing a speaker diaphragm and a method of manufacturing a voice
coil cover.
[0012]
In order to achieve the above object, according to the first aspect of the present invention, a
laminated sheet having a wood sheet made of natural wood and a reinforcing sheet laminated on
one side thereof is oriented in such a manner that the reinforcing sheet becomes an inner
peripheral surface. The first diaphragm formed in a substantially conical shape and the second
diaphragm formed in a substantially conical shape in the direction in which the reinforcing sheet
is the outer peripheral surface are in the order of a wooden sheet, a reinforcing sheet, a
reinforcing sheet and a wooden sheet It is characterized in that it is provided with a diaphragm of
a laminated structure formed by being superposed and formed.
[0013]
Second, the reinforcing sheet is formed by overlapping both ends of a notch opening cut out in a
V-shape toward the center with a part of the laminated sheet obtained by laminating a
reinforcing sheet to a wooden sheet made of natural wood. A step of forming a substantially
conical first diaphragm in the direction of the inner peripheral surface, and overlapping of both
ends of the notch opening of the bonded sheet in the direction of the reinforcing sheet in the
outer peripheral surface Forming the second diaphragm of the shape, and superposing the first
and second diaphragms of the substantially conical shape in the order of wood sheet,
reinforcement sheet, reinforcement sheet and wood sheet by press heating and forming It is
characterized in that it comprises a step of producing a speaker diaphragm of a laminated
structure having a substantially trumpet shape.
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[0014]
Third, the first diaphragm and the second diaphragm, which are made of a laminated sheet
having a wood sheet made of natural wood and a reinforcing sheet laminated on one side of the
sheet, are a wooden sheet, a reinforcing sheet, and a reinforcement It is characterized in that it
comprises a diaphragm having a laminated structure in which sheets and wooden sheets are
stacked in order and formed into a substantially dome shape.
[0015]
The fourth is a first diaphragm in which a bonded sheet having a wood sheet made of natural
wood and a reinforcing sheet bonded to one surface thereof is formed in a substantially dome
shape in the direction in which the reinforcing sheet is the inner peripheral surface. And a second
diaphragm in which the laminated sheet is formed into a substantially dome shape in such a
direction that the reinforcing sheet becomes an outer peripheral surface, and is laminated in the
order of a wooden sheet, a reinforcing sheet, a reinforcing sheet and a wooden sheet to form a
substantially dome shape And a diaphragm having a laminated structure formed into
[0016]
Fifth, the first diaphragm and the second diaphragm, which are made of a laminated sheet having
a wood sheet made of natural wood and a reinforcing sheet laminated on one side of the sheet,
are a wooden sheet, a reinforcing sheet, and a reinforcement A voice coil cover of a laminated
structure is provided, which is laminated in the order of a sheet and a wood sheet and formed
into a substantially dome shape.
[0017]
A sixth diaphragm is a first diaphragm in which a bonded sheet having a wood sheet made of
natural wood and a reinforcing sheet bonded to one surface thereof is formed into a substantially
dome shape in a direction in which the reinforcing sheet is an inner peripheral surface. And a
second diaphragm in which the laminated sheet is formed into a substantially dome shape in
such a direction that the reinforcing sheet becomes an outer peripheral surface, and is laminated
in the order of a wooden sheet, a reinforcing sheet, a reinforcing sheet and a wooden sheet to
form a substantially dome shape And a voice coil cover of a laminated structure formed into the
following.
[0018]
Seventh, a first diaphragm and a second diaphragm made of a laminated sheet obtained by
laminating a reinforcing sheet on a wood sheet made of natural wood are pressed by heat
molding to form a wooden sheet, a reinforcing sheet and a reinforcing sheet And a step of
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forming a speaker diaphragm of a laminated structure having a substantially dome shape by
superposing the wooden sheets in order.
[0019]
Eighth, a first diaphragm and a second diaphragm made of a laminated sheet obtained by
laminating a reinforcing sheet on a wood sheet made of natural wood are pressed by heat
molding to form a wooden sheet, a reinforcing sheet and a reinforcing sheet And a step of
forming a voice coil cover of a laminated structure having a substantially dome shape by
overlapping in order of wooden sheets.
[0020]
The ninth is forming a first diaphragm by forming a bonded sheet in which a reinforcing sheet is
bonded to a wooden sheet made of natural wood in a substantially dome shape in a direction in
which the reinforcing sheet is an inner peripheral surface, and Forming a second diaphragm by
forming the laminated sheet into a substantially dome shape in a direction in which the
reinforcing sheet is to be an outer peripheral surface, and forming the second diaphragm and the
second diaphragm by pressing heat molding And a step of forming a speaker diaphragm of a
laminated structure in a substantially dome shape in which the sheet, the reinforcing sheet, the
reinforcing sheet, and the wooden sheet are stacked in this order.
[0021]
Tenth is a step of forming a bonded sheet in which a reinforcing sheet is bonded to a wooden
sheet made of natural wood into a substantially dome shape in a direction in which the
reinforcing sheet is an inner peripheral surface to form a first diaphragm; Forming a second
diaphragm by forming the laminated sheet into a substantially dome shape in a direction in
which the reinforcing sheet is to be an outer peripheral surface, and forming the second
diaphragm and the second diaphragm by pressing heat molding And forming a combined voice
coil cover of a laminated structure in a substantially dome shape by stacking in the order of a
sheet, a reinforcing sheet, a reinforcing sheet and a wooden sheet.
[0022]
In the first and second loudspeakers and the method of manufacturing the diaphragm according
to the present invention, the combined vibration of the laminated structure is obtained by
respectively superposing the first diaphragm and the second diaphragm which are formed in a
conical shape in advance. Since the plate is used, distortion is unlikely to occur on the bonding /
adhesion surface, so that surface rigidity of the entire diaphragm can be ensured and warpage
can be reliably suppressed, and it can be used as a speaker for middle sound and bass.
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[0023]
In addition, diaphragms for medium sound and bass can be manufactured without impairing the
molding processability and mass productivity.
In addition, since the first and second diaphragms, which are formed in a conical shape in
advance, are overlapped, if the thickness of the wooden sheet is thin, about half of the
conventional one can be used, the press with high forming accuracy While it is possible to obtain
the heat forming and improve the appearance by the wood sheet made of wood grain on both
sides, it is possible to reliably suppress the warp.
[0024]
Further, in the third and fourth loudspeakers of the present invention, since the combination
diaphragm of the laminated structure in which the first and second diaphragms formed in a
dome shape in advance are superimposed, both sides are woodgrained It is possible to secure the
surface rigidity of the entire diaphragm and securely suppress warping while improving the
appearance by using a wooden sheet, and it can be used as a high sound speaker.
[0025]
Further, in the fifth and sixth loudspeakers of the present invention, securing of the surface
rigidity and sagging can be reliably suppressed while the appearance of the voice coil cover is
improved by the wood sheet having a woodgrain on both sides.
[0026]
In the seventh to tenth speaker diaphragms and voice coil cover manufacturing method of the
present invention, the first and second diaphragms, which are formed in a dome shape in
advance, are superposed by press heating and forming. Since the laminated structure can be
made, the high-tone diaphragm and voice coil cover can be made without impairing the
formability and mass productivity.
In addition, it is possible to reliably suppress the warping and securement of the overall surface
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rigidity while improving the appearance of the diaphragm and the voice coil cover by the wood
sheet having a woodgrain on both sides.
[0027]
Hereinafter, the first embodiment of the present invention will be specifically described with
reference to the drawings of FIGS. 1 to 4.
[0028]
FIG. 1 shows a speaker used for middle tone and low tone according to the present invention.
The speaker 1 includes a diaphragm 5 disposed in the housing 3, a voice coil 7 provided at a
central portion of the diaphragm 5, and a diaphragm driving device 9 for driving the diaphragm
5 via the voice coil 7. And.
[0029]
The outer peripheral edge of the diaphragm 5 is fixedly supported by the housing 3 via an
elastically deformable rubber edge 11 mounted over the entire peripheral edge thereof and an
annular arrow 13 for restraining the end of the rubber edge 11.
The voice coil 7 is covered by a voice coil cover 15 and is fixed to a central portion of the
diaphragm 5 and supported by the housing 3 via a movable movable damper 17.
The diaphragm driving device 9 is composed of a magnetic circuit portion 19 in which the pole
19a is exposed in the voice coil 7 and a doughnut-shaped magnet 21 mounted on the magnetic
circuit portion 19. Reference numeral 21 gives a driving force in the arrow direction to the voice
coil 7.
[0030]
On the other hand, as shown in FIGS. 2 and 3, the diaphragm 5 is a combination diaphragm of a
laminated structure in which the first diaphragm 23 and the second diaphragm 25 are
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superimposed, and it is used for middle and low tones. It has a conical shape in cross section.
[0031]
The first and second diaphragms 23 and 25 are, as shown in FIG. 6, a non-woven fabric or
Japanese paper on one side of a wooden sheet 29 that has been sheeted from a log-like wood 27
that is a natural wood. The sheet 33 is made of a laminated sheet 33 obtained by laminating a
reinforcing sheet 31 formed of
[0032]
The wooden sheet 29 is, for example, 0.05 mm, which is about half as thin as conventional one,
and 0.6 mm, which is thick, when used for sheeting from the log-shaped wood 27 into a sheet.
There is.
[0033]
The stacking direction of the first and second diaphragms 23 and 25 formed in a conical shape in
advance by the laminated sheet 33 is, as shown in FIGS. 2 and 3, a wooden sheet 29, a
reinforcing sheet 31, a reinforcing sheet 31, a wooden It is the order of the sheet 29.
[0034]
Next, a method of manufacturing the diaphragm of the speaker 1 will be described based on FIG.
[0035]
First, a sheet-like wooden sheet 29 is made by slicing from the log-cut wood 27 (1-a, 1-b).
At this time, the thickness of the wooden sheet 29 is different depending on the diameter of the
diaphragm 5, but the thin one uses 0.05 mm which is about half the conventional one and the
thick one uses 0.6 m as the conventional one. Then, a reinforcing sheet 31 such as non-woven
fabric or Japanese paper is attached to one side of the sheet to make a laminated sheet 33 (1-d).
[0036]
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9
Next, a V-shaped cutout 35 is formed in a part of the laminated sheet 33, and then the first
diaphragm 23 and the first diaphragm 23 in a state in which both ends 35a and 35b of the
cutout 35 are overlapped and temporarily fixed. The second diaphragm 25 is immersed in a
solution (37) containing a lubricant (or a penetrant) (1-e, 1-f).
The first diaphragm 23 is temporarily fixed so that the wood surface is on the conical inner
surface, and the second diaphragm 25 is temporarily fixed so that the wood surface is on the
conical outer surface.
As a result, the first diaphragm 23 and the second diaphragm 25 become soft, so that the male
mold 41 and the female mold 43 provided with the first and second diaphragms 23 and 25 and
heating means such as the heater 39 etc. It sets to the press 45 which consists of this, and carries
out temporary shaping | molding separately.
Thereafter, the temporarily molded first and second diaphragms 23 and 25 are impregnated with
a thermosetting resin or the like, and the first and second diaphragms 23 and 25 serve as the
wooden sheet 29, the reinforcing sheet 31, and the reinforcement. The sheet 31 and the wood
sheet 29 are combined to be a combination, and set again in a press machine to laminate and
bond two diaphragms with a thermosetting resin, and the whole diaphragm is hardened with a
thermosetting resin to form a curved surface Stabilize (1-g).
[0037]
When the wood sheet is as thin as about 0.1 to 0.2 mm, it is not always necessary to soften it by
dipping in a lubricant.
In that case, the first and second diaphragms 23 and 25 are directly impregnated with
thermosetting resin, and they are superimposed in the order of wood sheet, reinforcement sheet,
reinforcement sheet and wood sheet and set in a press Then, it may be hardened with a
thermosetting resin by hot pressing, and may be molded on a curved surface.
[0038]
Next, by processing the outside diameter of the diaphragm 5 after completion of pressing and
opening the hole 47 for voice coil at the center, the completed diaphragm 5 for medium sound or
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bass which is completed is obtained (1- h).
[0039]
The diaphragm 5 made for medium or low sound is a combined diaphragm of a laminated
structure in which the wooden sheet 29, the reinforcing sheet 31, the reinforcing sheet 31, and
the wooden sheet 29 are sequentially stacked, so the entire surface of the diaphragm The rigidity
can be secured and the sled can be reliably suppressed.
Moreover, since the wood sheet 29 with wood grain is disposed on the inside and the outside, it
is very preferable in terms of appearance quality.
As described above, since the first and second diaphragms 23 and 25 are laminated and bonded
after being deformed in advance to a curved surface, distortion in the two laminated surfaces
becomes small, and the shapes are easily stabilized.
[0040]
Furthermore, since the first and second diaphragms 23 and 25 are laminated facing the opposite
side (inner side, outer side), when the wood fibers are stacked in the same direction and molded,
the distortion of the front and back sides Can be offset, the shape is stable, and distortion of the
diaphragm due to aging can be prevented.
[0041]
FIG. 5 shows a second embodiment of the high sound speaker 1-A in which the diaphragm 49 is
formed in a dome shape in cross section.
[0042]
The diaphragm 49 is the same as that of the first embodiment in that it is a combined diaphragm
of a laminated structure in which the first diaphragm 23 and the second diaphragm 25 are
superimposed, and the difference is a conical shape. It is a point formed in a dome shape in cross
section used for high-pitched sound.
[0043]
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11
The first and second diaphragms 23 and 25 are, as shown in FIG. 7, a reinforcing sheet made of
non-woven fabric or Japanese paper on one side of a wooden sheet 29 that has been sheeted
from a wood 27 with log-like wood grain. A laminated sheet 33 is formed by laminating 31.
[0044]
The wooden sheet 29 is, for example, 0.05 mm, which is about half as thin as conventional one,
and 0.6 mm, which is thick, when used for sheeting from the log-shaped wood 27 into a sheet.
There is.
[0045]
As shown in FIG. 6, the stacking direction of the first and second diaphragms 23 and 25 made by
the laminated sheet 33 is the order of the wooden sheet 29, the reinforcing sheet 31, the
reinforcing sheet 31, and the wooden sheet 29. There is.
[0046]
The high-pitched speaker 1-A has the diaphragm drive device 9 provided in the housing 3
outside the diaphragm 49 in the same manner as in the first embodiment.
[0047]
Next, a method of manufacturing the diaphragm of the speaker 1 will be described based on FIG.
[0048]
First, a sheet-like wooden sheet 29 is made by slicing from a wood 27 cut into a log shape which
is a natural wood (1-a, 1-b).
At this time, the thickness of the wooden sheet 29 is different depending on the diameter of the
diaphragm 5, but the thin one uses 0.05 mm, which is about half the conventional one, and the
thick one uses 0.6 mm as the conventional one. Then, a reinforcing sheet 31 such as non-woven
fabric or Japanese paper is attached to one side of the sheet to make a laminated sheet 33 (1-d).
[0049]
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Next, the first diaphragm 23 and the second diaphragm 25 made of the laminated sheet 33 are
dipped in a solution (1e, 1f) containing a lubricant (or a penetrant).
As a result, the first diaphragm 23 and the second diaphragm 25 become soft, so the first and
second diaphragms 23 and 25 are set in a press equipped with a heating means such as a heater
39 and separately Temporarily molded into a dome shape.
At that time, the first diaphragm 23 is temporarily molded so that the wood surface is on the
dome surface, and the second diaphragm 25 is temporarily molded so that the wood surface is
on the back of the dome (1-g).
Thereafter, the temporarily molded first and second diaphragms 23 and 25 are impregnated with
a resin such as thermosetting, and the first diaphragm 23 and the second diaphragm 25 are
made of a wooden sheet, a reinforcing sheet, and the like. The sheet is stacked in the order of
reinforcing sheet and wooden sheet, and it is set in the press again to laminate and bond two
diaphragms with thermosetting resin, and harden the whole diaphragm with thermosetting resin
to form a curved surface shape Stabilize.
[0050]
When the wood sheet is as thin as about 0.1 to 0.2 mm, it is not always necessary to soften it by
dipping in a lubricant.
In that case, the first and second diaphragms 23 and 25 are directly impregnated with
thermosetting resin, and they are superimposed in the order of wood sheet, reinforcement sheet,
reinforcement sheet and wood sheet and set in a press Then, it may be hardened with a
thermosetting resin by hot pressing, and may be molded on a curved surface.
[0051]
Next, by performing an outer diameter process of the diaphragm 49 after completion of pressing,
a diaphragm 49 formed in a dome shape in cross section for high-pitched sound is obtained (1h).
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[0052]
The diaphragm 49 made for high sound is a combination diaphragm of a laminated structure in
which the wooden sheet 29, the reinforcing sheet 31, the reinforcing sheet 31, and the wooden
sheet 29 are stacked in this order. Sledge can be reliably suppressed.
Moreover, since the wood sheet 29 with wood grain is disposed on the inside and the outside, it
is very preferable in terms of appearance quality.
[0053]
On the other hand, the diaphragm 49 made for high-pitched sound may be used as the voice coil
cover 15 shown in FIG.
Since the voice coil cover 15 vibrates during operation of the speaker 1, the diaphragm 49 made
to have a dome shape in cross section is used as it is to be the most suitable voice coil cover.
In addition, it is not necessary to make a dedicated voice coil cover separately, which is very
preferable in terms of cost.
[0054]
BRIEF DESCRIPTION OF THE DRAWINGS The general | schematic cutting | disconnection
explanatory drawing which showed 1st Embodiment of the speaker using the diaphragm of the
cross-sectional conical shape concerning this invention.
FIG. 8 is a schematic perspective view showing the overlapping direction of the first diaphragm
and the second diaphragm.
Cross-sectional explanatory drawing of a part of FIG. 2 used as the combination diaphragm.
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The schematic explanatory drawing which showed the process of making the conical diaphragm
for speakers.
The general | schematic cutting | disconnection explanatory drawing which showed 2nd
Embodiment of the speaker using the diaphragm of cross-sectional dome shape.
Explanatory drawing which showed the combination cross section of the diaphragm of crosssectional dome shape.
BRIEF DESCRIPTION OF THE DRAWINGS Outline explanatory drawing which showed the process
of making the diaphragm for speakers of cross-sectional dome shape.
Outline explanatory drawing which showed the state which a sled generate | occur | produces,
when boarding a wooden sheet from log-shaped wood.
Outline explanatory drawing which showed the state which the distortion of a prior art example
appears.
Explanation of sign
[0055]
DESCRIPTION OF SYMBOLS 5 ... Diaphragm of cross-sectional cone 15 ... Voice coil cover 23 ...
1st diaphragm 25 ... 2nd diaphragm 27 ... Wood wood 29 ... Wooden sheet 31 ... Reinforcement
sheet 33 ... Laminated sheet 35 ... Notch opening 45: Press machine 49: Diaphragm of cross
section dome shape
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