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JPH09261794

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DESCRIPTION JPH09261794
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of manufacturing a speaker diaphragm of a speaker used in an audio apparatus or the
like and a molding die used in the method.
[0002]
2. Description of the Related Art In recent years, in the audio industry, the development of highpitched bass has progressed, and non-press diaphragms that have large amplitude and little
distortion as speakers are used.
[0003]
A conventional non-press speaker diaphragm and a method of manufacturing the same will be
described below.
[0004]
FIG. 5 shows an example of a conventional speaker diaphragm, and FIG. 6 is a side crosssectional view of the speaker. 2 is a conical diaphragm having a central hole 2a coupled to a
voice coil bobbin at the center. , 1 is an annular edge to be adhered to the outer peripheral
portion 2b of the diaphragm main body 2, and this edge 1 is formed by molding foamed rubber
in order to reduce distortion; The diaphragm body 2 is combined with the adhesive 3 to form a
speaker diaphragm.
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1
[0005]
The diaphragm 4 is coupled to a voice coil bobbin 5 having a voice coil at a central hole 2a on
the inner periphery, and the outer periphery is coupled to a frame 6 coupled to a magnetic
circuit 7 consisting of a plate and a magnet via an edge 1; The voice coil bobbin 5 inserted in the
magnetic block of the magnetic circuit 7 is caused to oscillate back and forth by a voice input
signal inputted to the magnetic circuit 7, and is generated by the diaphragm 4.
[0006]
However, since the material of the edge 1 of the above-mentioned conventional speaker
diaphragm is foam rubber, it can not cope with the solvent and the adhesive 3 is restricted, and
the adhesive force is weak. In addition, a bonding process of the edge 1 and the diaphragm main
body 2 is also required.
[0007]
The present invention solves the above-mentioned conventional problems, and aims to improve
the adhesion and reduce the number of assembly steps.
[0008]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, in the method
of manufacturing a diaphragm for a speaker according to the present invention, a step of filling a
foam rubber in a mold and a peripheral edge are positioned in the mold And a step of heating the
mold to foam the foamed rubber and integrally molding an edge made of the foamed rubber so
as to sandwich the peripheral edge of the diaphragm body. In addition to the bonding process of
the edge and the diaphragm main body being omitted, since the edge sandwiches the diaphragm
main body, the bonding strength is also improved and the quality and performance are stabilized.
[0009]
The invention according to claim 1 of the present invention comprises the steps of: filling foamed
rubber into a mold; and disposing the diaphragm main body so that the peripheral edge is
positioned in the mold. A step of heating the mold to foam the foam rubber and integrally
molding an edge made of the foam rubber so as to sandwich the peripheral edge of the
diaphragm main body; and bonding the edge and the diaphragm main body Further, the
diaphragm main body is held between the edges to further improve the bonding strength, and
the quality and performance can be stabilized.
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2
[0010]
The invention according to claim 2 of the present invention is to integrally form an edge made of
foamed rubber after passing through the step of pressing the peripheral edge of the diaphragm
main body in advance to equalize the thickness. It is intended to make the bonding strength of
the edge to the diaphragm body uniform.
[0011]
In the invention according to claim 3 of the present invention, the peripheral portion of the
diaphragm main body is held by the concave portion filled with the foam rubber forming the
edge portion of the speaker diaphragm and the heated foam rubber. It consists of a split mold
which has a holding groove which has a space thicker than the thickness of the peripheral part
and which has holding means for holding the above-mentioned diaphragm main body, and the
edge formed of foam rubber ensures the diaphragm main body. It is something which is made to
hold.
[0012]
According to the invention of claim 4 of the present invention, in addition to the constitution of
claim 3, the holding means for holding the outer peripheral rim of the diaphragm main body is a
holding means for holding the peripheral rim of the diaphragm main body with a fixed value
Thus, it is intended to make the thickness of the peripheral edge of the diaphragm body uniform.
[0013]
The invention according to claim 5 of the present invention is that, in addition to the constitution
according to claim 4, a clamping portion is provided to at least one of the divided molds as a
clamping means via a spring in a fixing portion of the mold. The spring prevents the excessive
holding force from being applied to the diaphragm main body.
[0014]
Hereinafter, an embodiment of a method of manufacturing a speaker diaphragm of the present
invention will be described with reference to FIGS. 1 to 4.
[0015]
(Embodiment) FIG. 1 is a cross-sectional view of an essential part of a speaker diaphragm
according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view for
explaining a state of installation in the lower mold. 3 is a conceptual cross-sectional view of the
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3
same mold, and FIG. 4 is a cross-sectional view for explaining the same molding state.
[0016]
Referring to the figure, the molding die will be described first. The lower mold 10 comprises a
movable lower mold 10b and an edge molding lower mold 10c, etc. via a plurality of springs 10a
provided circumferentially. The edge molding lower mold 10c is provided with an annular
stopper 10d and an annular recess 10e protruding upward.
[0017]
The upper mold 11 is composed of a movable upper mold 11b and an edge molding upper mold
11c via a plurality of springs 11a provided on the circumference, and the edge molding upper
mold 11c corresponds to the recess 10e. The annular convex part 11d is provided, and the edge
17 is formed in the gap (holding groove part) formed by the convex part 11d and the concave
part 10e.
[0018]
The movable upper die 11b is provided with an annular holding projection 11e for holding a
diaphragm main body 15 of a non-press described later with the movable lower die 10b.
[0019]
Next, the manufacturing method using the said metal mold | die of the diaphragm for speakers of
this invention is demonstrated.
Reference numeral 15 denotes a non-press diaphragm main body, which is first attached to the
movable lower die 10b.
At this time, the outer peripheral tip portion 15a of the diaphragm main body 15 is mounted so
as to protrude above the recess 10e.
[0020]
Next, foam rubber 16 is appropriately placed in the recess 10e of the lower edge molding die
10c, and press molding is started, and the upper die 11 is lowered until the upper edge molding
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4
11c abuts on the stopper 10d.
[0021]
At this time, the movable lower mold 10b and the movable upper mold 11b holding the
diaphragm main body 15 are respectively retracted while the diaphragm main body 15 is slightly
pressurized by the springs 10a and the springs 11a.
[0022]
Since the lower mold 10 and the upper mold 11 are heated, the foamed rubber 16 foams and
expands to fill the gap formed by the convex portion 11 d and the concave portion 10 e, and the
edge 17 is the diaphragm main body 15 Formed so as to sandwich the
[0023]
As described above, since the diaphragm main body 15 is held between the movable lower die
10b and the movable upper die 11b via the spring 10a and the spring 11a, vibration can be
generated by appropriately selecting the elasticity of the spring 10a and the spring 11a. While
making it possible to hold the plate main body 15 with a pressure that does not lose the feature
of the non-press, a ring-shaped uniform thickness portion is formed on the outer periphery of the
diaphragm main body 15 adjacent to the edge 17 While the volume density becomes uniform
and contributes to the stabilization of the variation of the performance, it has the additional
effect of improving the appearance of the appearance.
[0024]
In the above embodiment, the diaphragm main body 15 is non-press, but even if a general
pressed diaphragm main body is used, it can be applied as an efficient method for manufacturing
a speaker diaphragm. .
In addition, although not particularly shown in FIGS. 1 to 4 in the above embodiment, small holes
and narrow grooves for degassing when the foam rubber 16 foams are provided as necessary.
[0025]
As described above, according to the method of manufacturing the speaker diaphragm of the
present invention, the bonding process can be reduced by integrally molding the foamed rubber
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5
which becomes an edge on the speaker diaphragm main body in the mold. In addition, the
adhesive strength can be improved.
[0026]
Brief description of the drawings
[0027]
1 is a side sectional view of a speaker diaphragm which is an essential part of an embodiment of
the present invention.
[0028]
2 is a side sectional view for explaining the state of installing the diaphragm main body which is
the main part to the lower mold
[0029]
Fig. 3 Conceptual side sectional view of the same mold
[0030]
Fig. 4 A side sectional view for explaining the same molding state
[0031]
Fig. 5 Cross-sectional view of the conventional speaker diaphragm
[0032]
Figure 6 Side cross-sectional view of the same speaker
[0033]
Explanation of sign
[0034]
DESCRIPTION OF SYMBOLS 10 lower mold 10a spring 10b movable lower mold 10c edge
molding lower mold 10d stopper 10e recessed part 11 upper mold 11a spring 11b movable
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upper mold 11c edge molding upper mold 11d convex part 15 diaphragm main body 16 foamed
rubber 17 edge
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