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JPS6187500

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DESCRIPTION JPS6187500
[0001]
The present invention relates to a diaphragm for a speaker. Generally, as the material of the
speaker diaphragm, it is light in weight and has high Young's ?? low density moderate
consonant internal loss so that the output sound pressure frequency characteristics etc. of the
speaker can be obtained favorably. It is also required that the bending rigidity is large and the
like C. As the size or Young's modulus is higher and the density is lower, the resonance frequency
of the diaphragm is higher and the piston movement area is expanded, so that the frequency
band of the speaker is wider, and the division resonance of the moving plate is reduced as the
internal loss is larger. The frequency characteristic is flattened. In addition, when the diaphragm
is soft or when the frequency is high, partial vibration occurs to deteriorate the characteristics,
and therefore the bending rigidity must be high. For this reason, a foamable material has
conventionally been attracting attention as a material of the diaphragm, and for example, a
method of adhering the foamable material to the shaking temporary group 4A, non-foamed
particles are natural fibers, synthetic fibers or these There are a method of mixing and sheetforming the mixture, and then heating and foaming, and further, a method of forming a foamable
plastic into a powder, filling it in a mold and subjecting it to processing such as heating and
pressing. That is, by using the foamable material, the density can be reduced and Nm can be
achieved, and the efficiency of the speaker can be improved. Also, acoustical internal losses can
be obtained sufficiently. However, such conventional techniques have the following problems.
That is, in the case of the method of sticking the foam material, it is difficult to uniformly stick
one having the same foaming ratio to the substrate. In addition, in the case of the method of
mixing and forming non-foamable particles, it is difficult to fix the particles to the base material.
In these cases, the physical properties of the diaphragm (q) are unstable and the Young's
modulus is extremely reduced. Further, in the case of a method in which foamable plastic is filled
into a mold as a powder and then foam-formed, it is necessary to make the plastic into a powder,
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and work such as filling, molding, mold release tends to be complicated. In the obtained moving
plate, the degree of freedom in making the physical properties of the shell is poor, and in
particular, in the Young's modulus etc., the vibrating plate can not be replaced with limited
performance. The object of the present invention is to provide a speaker side moving plate in
which good physical property values can be freely obtained according to the purpose while
suppressing a decrease in Young's modulus. The diaphragm for a speaker according to the
present invention is C-sheet-fabricated using natural fibers, synthetic fibers or a mixture of these
as raw materials, and a non-foamable foamable thermosetting resin is attached to the fiber
material in the obtained diaphragm. It is characterized in that the attached thermosetting resin is
foamed 11.
Tomo-LJL and below 1 An embodiment of the present invention will be described based on the
drawings. FIG. 1 (a) shows a diaphragm substrate 1 obtained by papermaking. The diaphragm
substrate 1 is formed by mutual fiber-to-fiber bonding of the giN material 2 consisting of natural
fibers, synthetic fibers or a mixture thereof as shown in FIG. 1 (b). There is a gap 3 between the
fiber materials. The vibration plate substrate 1 is slightly impregnated into the gap 3 in a
thermosetting resin solution having foamability. After that, it is the diaphragm 4 for a speaker
shown in FIG. 2 (a>) that has been foamed and hardened by heating. The speaker diaphragm 4 is
as shown in FIG. 2 (b)! It comprises a fiber material 2 and a foamed resin part 5 of a foamed
thermosetting resin. By using an organic solvent such as thinner as the solvent for the
thermosetting resin, the solution of the resin penetrates into the gaps between the uA fibers
without loosening the bonds between the fibers 1f1 and the resin is used as a resin. Attach it. In
addition, uniformly adhering the resin solution to the fiber material in the gap is colored with the
bonding force between the iam4ii agents. For example, when using a raw material with a high
degree of beating during the production of the base material, adding an internal sizing agent
such as rosin, or ? increasing the pressing pressure at the time of drying with a heat press, a
strong fiber-to-fiber bonding takes place Therefore, it is difficult to permeate the resin solution to
the inside. Therefore, the diaphragm for a speaker in the present embodiment uses a hollow fiber
as a raw material or a material having a relatively low degree of beating and dried without
pressing to provide a relatively wide gap for fiber-to-fiber bonding to form a diaphragm
substrate. The surface and the inside of the imaging plate obtained by adhering the
thermosetting resin to the inside also have a foamed material portion. The speaker diaphragm of
this embodiment can be obtained through the manufacturing process as shown in FIG. First, as a
beating step S1, for example, a generally known kapok is subjected to beating to give a beating
degree of 20 to 22 degrees SR. Next, the material which has been beaten as a papermaking
process $ 2 is used as a raw material to make a sheet with a predetermined shape and a
thousand inch without using a sizing agent, and dried to form a substrate. Next, in the
impregnation step S3, the base obtained in the thermosetting resin solution having foamability
prepared in the ?I fat liquid preparation step S4 is dipped, and the thermosetting resin solution
is put in the base Impregnated onto the kapok fiber. Thereafter, in the drying step S5, the base
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material impregnated in the dryer is dried and foamed and hardened by heating with a hot air of
80 to 100'C for about 10 minutes. At this time, if necessary, a pressure of about 1.0 to 2 kg / cm
2 may be applied.
In the resin liquid preparation step S4, the mixing ratio by weight of novolak to thinner is mixed
at a ratio of 1: 4 to 1: 6 to dissolve the novolak, and then 8% to 10% weight ? to the obtained
liquid The foaming agent is added in the proportion of 1 part, and after stirring, the
thermosetting resin solution having the foaming property by adding the curing agent in the
proportion of 8% to 10% heavy mouth part to the obtained liquid ( q. In this example, since
novolak type phenol resin is used as the curable resin, for example, azodecarbonamide or
azobisisobutyl nitrile is used as the foaming agent, and hexamethylenetetramine etc. is used as
the curing agent. Do. In addition, expansion ratio can be changed according to the objective by
changing the heating foaming conditions in a drying process. The physical properties of the
speaker diaphragm of the present invention obtained in this manner and the physical properties
of the speaker diaphragm consisting only of the base material are not shown in Table 1. Table 1
First, the diaphragm of this embodiment effectively internal loss, and there is no decrease in
Young's modulus. Also, the lC1 density has not increased. Then, the surface thickness is
increased and the stiffness is greatly increased. These are because the resin solution is embedded
and foamed and hardened to the inside of the diaphragm. In this example, the expansion ratio is
set to match the density to the base material, so there is no big difference in Young's modulus,
however, even in the base material of 100% kapok, which was conventionally considered difficult
to use. Since the bending stiffness can be greatly improved, its use is realized without losing the
low density that is characteristic of the katsupoku fiber. This makes it easy to obtain an interfiber bond having as wide a gap as possible in the base material obtained by selecting raw
materials and paper-making conditions, even in the case of using natural saccharin fibers or
synthetic fibers. It is possible. Further, although the novolak foamable phenolic resin is attached
to the entire diaphragm in the above embodiment, other partial attachment is possible. For
example, the base material after paper making is impregnated with a polyurethane resin solution
or the like to form a film on the surface, and then the novolak foamable phenolic resin is
attached, for example, to a portion near the etch of the diaphragm, ie, near the outer peripheral
edge. In particular, it is possible to improve the performance of the diaphragm, such as
suppressing divided vibrations at the time of reproduction of high frequencies. As described
above, according to the present invention, a vibratory plate obtained by forming a natural fiber
and a synthetic fiber is used as a base material, and a thermosetting resin solution having
foaming property is attached to the base material and foamed by heating. By curing it, the
complexity of the working process, the instability of the physical properties, etc. are eliminated,
and (the performance required for the peristaltic plate is satisfied, and further the performance
of the base material is maintained, and the bending rigidity is It can be greatly improved.
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Further, by changing the raw material of the base material, the paper-making conditions thereof,
and the drying conditions, it is possible to obtain an excellent 1 swing temporary speaker for a
speaker having physical properties suitable for the purpose.
[0002]
Brief description of the drawings
[0003]
Fig. 1 (a) is a cross-sectional view of the base material of the speaker diaphragm according to the
present embodiment, Fig. 1 <b> is a partially enlarged cross-sectional view of Fig. 1 (a), and Fig. 2
(a) is this embodiment FIG. 2 (b) is a partial enlarged cross-sectional view of FIG. 2 (a>), and FIG.
3 is a flowchart showing a manufacturing process of the speaker diaphragm according to the
present embodiment.
Explanation of symbols of main parts 1 иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Diaphragm for
loudspeaker 5 иииии .. Foam part
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