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JPS62216494

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DESCRIPTION JPS62216494
[0001]
The present invention relates to a diaphragm for a speaker. Generally, the diaphragm for a
speaker has physical properties as a performance to improve the efficiency on the acoustic
characteristics of the speaker using the diaphragm, the flatness of the sound pressure frequency
characteristic, the durability against the maximum input, and the like. It is required that the
density is small, the Young's modulus is large, the internal loss is appropriately large, and that
the processability is high and the material is inexpensive in manufacturing the diaphragm. 2.
Description of the Related Art Conventionally, as a diaphragm that satisfies these various
requirements to some extent, diaphragms formed by refining and forming wood pulp, which is a
natural fiber, are widely manufactured. In addition, a diaphragm made of aluminum, beryllium,
boron or the like as a highly elastic and lightweight diaphragm having good moisture resistance,
or an inorganic fiber such as ceramic as a diaphragm having a high elasticity and appropriate
internal loss, plastic Diaphragms formed by bonding organic fibers such as E.I. with a binder are
also manufactured. However, in the case of a diaphragm made of a conventional natural fiber as
a main component, there is a limit in increasing the Young's modulus and increasing the internal
loss, and there is a disadvantage such as being susceptible to humidity. In the case of an imaging
plate made of a material such as aluminum, its internal loss is small, and there is a drawback that
flattening of the sound pressure frequency characteristics of the speaker is difficult. In addition,
in the case of a diaphragm made of inorganic or organic fibers, there are drawbacks such as an
increase in density, a decrease in internal loss, and an increase in the number of manufacturing
steps. Also, recently, the use of speakers has been expanded and, for example, those used in
vehicles require moisture resistance and water resistance in addition to the above-mentioned
performance. For this purpose, although a diaphragm provided with a synthetic resin has been
developed, it also has disadvantages such as an increase in density, an increase in the number of
manufacturing steps, and an increase in cost due to the use of an expensive synthetic resin
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material. The purpose of the present invention is to solve the above-mentioned drawbacks and to
provide a waterproof speaker diaphragm which maintains appropriate elasticity and increases
internal loss. is there. The speaker diaphragm according to the present invention is characterized
by comprising a base mainly composed of natural mM, chemical fibers or a mixture thereof, and
asphalt impregnated between the fibers of the base. An embodiment of the present invention will
be described below with reference to the attached drawings. FIG. 1 is a cross-sectional view of a
cone-type speaker diaphragm of this embodiment. Roll edges 2 are attached to the outer
peripheral edge of the diaphragm 1. FIG. 2 is an enlarged partial cross-sectional view of a portion
shown by circle A in FIG. 1, and shows that the diaphragm 1 is composed of a base fiber [3 and
asphalt 4 adhering to the base fiber.
The cone-type speaker diaphragm of FIG. 1 is manufactured as a first embodiment. First, waste
paper, waste cotton and wool waste are used as the main raw materials, and a felt-like continuous
base paper is produced by a circular net paper machine. The main raw materials may be natural
fibers or chemical fibers or mixtures of these. Next, the base paper is dipped in molten asphalt to
make an asphalt felt with 50 to 100 wt% (dry weight) adhered. In this case, petroleum asphalt is
used as the asphalt, and a black semisolid obtained by further distilling the remaining heavy oil
obtained by fractionating volatile components from crude oil is used which is easily melted by
heating. The obtained asphalt felt is also known as a roof ink construction material. Next, the
asphalt felt is cut into a development fan-shaped base 5 as shown in the plan view of FIG. 3 for
forming a desired diaphragm shape by a punching die or the like. In this case, since the base
paper fiber of asphalt felt has directivity (arrow F), it is preferable to cut out the cutout so that
the radial direction of the cutout part of the fan is substantially perpendicular to the fiber
direction. Next, an adhesive for a predetermined time is applied to the sector-shaped notched
edge portions S + and 82 to be stuck, and each is stuck to obtain a cone type substrate. At the
time of bonding, as shown in the sectional view of FIG. 4, the diaphragm substrate 5 is placed on
a convex mold 6 having a predetermined shape for fixing the substrate, and the substrate 5 is
fixed. At a mold temperature of 50 to 100 ░ C., heat pressing is performed from above with a
concave mold for about 5 to 10 seconds to simultaneously perform molding and adhesion. The
convex mold 6 has a plurality of small through holes 7 perforated at a predetermined surface
density on the convex side surface so as to penetrate the mold and sucks air through the small
through holes, and the base 5 Is fixed on the convex mold 6. Thus, the speaker diaphragm of the
first embodiment is obtained. As a second embodiment, a diaphragm for a cone type speaker
similar to that of the first embodiment is manufactured. First, the UKP pulp (unbleached kraft
pulp) is beaten to a freeness of 201 fSR to obtain a stock. A cone-shaped substrate is formed
from the stock with a predetermined cone-shaped wire mesh. The substrate is dried to obtain a
diaphragm substrate. Next, the diaphragm substrate is dipped in a back asphalt obtained by
mixing 1 part of asphalt 55 W and 45 parts by weight of gasoline, and the substrate is
impregnated with the back asphalt, and then the substrate is dried to obtain the whole substrate.
The asphalt penetrates and gets adhered to it. In addition, back asfu? Lu is a light oil such as
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gasoline or kerosene dissolved in asphalt, and the amount of asphalt attached to the substrate
can be adjusted by the mixing ratio.
Thus, the diaphragm for the speaker of the second embodiment is obtained. The diaphragms of
the first and second embodiments obtained, and a diaphragm made from pulp fiber of UKP 20
degree SR conventionally and not subjected to any impregnation treatment (comparative example
1) and a diaphragm formed from 100 wt% of propylene The properties are compared with those
of Comparative Example 2 and the results are shown in the following table. As is apparent from
the table, the imaging plates of Examples 1 and 2 are maintained substantially smaller in Young's
modulus compared to Comparative Examples 1 and 2, and the internal loss and loss elastic
modulus are the values of this embodiment. You can see that the example is much bigger.
Further, it can also be seen that Examples 1 and 2 are maintained at the same level as
Comparative Example 2 in terms of density. FIG. 5 is a graph of sound pressure frequency
characteristics of a speaker using the first embodiment and the comparative example 2. The solid
line A indicates the first embodiment and the broken line B indicates the characteristic curve of
the comparative example 2. As is clear from the graph, it can be seen that the speaker using the
speaker diaphragm according to the present embodiment has a sound pressure frequency
characteristic smaller in dip and more flat than that in Comparative Example 2. Furthermore, also
in the waterproofing test, since the present embodiment is composed of a base that is sealed with
inexpensive asphalt, it is superior in moisture resistance and waterproofness to a conventional
moving plate made of only pulp fibers, and synthetic There is less cost to manufacture than those
obtained by impregnating and drying the resin. As described above, according to the present
invention, the diaphragm for the speaker achieving the flattening of the sound pressure
frequency characteristic of the speaker since the internal loss is greatly increased by maintaining
the appropriate elasticity. can get. Moreover, the diaphragm for speakers which improved
moisture resistance and waterproofness is obtained. Furthermore, even in the manufacturing
process, it is a simple process! A diaphragm capable of 1M construction is obtained.
[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view of a speaker diaphragm according to the present invention, FIG. 2 is an
enlarged partial cross-sectional view of a portion shown by circle A in FIG. 1, and FIG. Fig. 4 is a
cross-sectional view of a mold for fixing an asphalt felt diaphragm base body, and Fig. 5 is a
graph of sound pressure frequency characteristics of a speaker using the first embodiment and
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the second comparative example.
Explanation of symbols of the main part 1 .. .. Cone-shaped diaphragm 2 .. .. .. Roll edge 3... Felt
base 6 ииииииии Mold for fixing
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