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Specification 1. Title of invention
Speaker diaphragm
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker
diaphragm for a honeycomb structure having well-balanced acoustic characteristics and excellent
mass productivity. In general, the characteristics required for the speaker diaphragm are, first,
that the specific elastic modulus of the diaphragm (hereinafter referred to as E / ?, E is an elastic
modulus and ? is a density) is as high as possible, It is necessary to have an internal loss of
Here, raising E / ? is necessary to expand the piston movement area of the speaker, and
increasing internal loss is necessary to smooth the sound pressure characteristics in the high
frequency area. It is. FIG. 1 shows an example of the sound pressure-frequency characteristics of
the speaker, which can generally be roughly divided into a piston movement region and a divided
vibration region. The piston movement area, that is, the area to the left of the dotted line in the
figure is an area of relatively low frequency where vibration vibrates together, and the sound
pressure-frequency characteristic is flat and y distortion is also generated. ,small. On the other
hand, in the divided vibration region, that is, the one on the right side of the dotted line in the
figure, the sound pressure characteristic tends to be uneven in the region of relatively high
frequency where each portion of the diaphragm vibrates locally differently. -Also often large.
Therefore, there has been a method in which carbon fibers are mixed into a single-plate
diaphragm mainly made of paper No. Lug for the purpose of improving E / ?. In this method, the
amount of carbon fibers mixed is EndPage: 1 limit As a result, the increase in E / ? can not be a
hope. There is also a method of impregnating the diaphragm of paper with various organic-based
paints in order to increase the internal loss, but this method has the disadvantage that the E / ?
? decreases while the internal loss increases. is there. There are various other Q attempts, but it
is almost impossible to satisfy the requirements of both E / ? and internal loss with a simple
?configured diaphragm?. From the above, recently, in order to obtain a diaphragm having a
high E / ?? and an appropriate internal loss, a honeycomb core made of a thin film of metal or
polymer-material is used as a core material, and metal is used on both sides of this core material.
Alternatively, a diaphragm of a so-called three-layer sandwich structure in which a thin film of a
fiber reinforced resin based on a polymer material, glass fiber, carbon fiber, or Kepler fiber is
laminated. Although these diaphragms increase E / ? several times in comparison with
conventional pulp and paper diaphragms, the internal loss is reduced, or the outer surface of the
diaphragm is increased to increase the internal loss. However, it has been practiced to apply a
rubber-based paint or to adhere a foam sheet, but there have been drawbacks such as a decrease
in E / ? and a decrease in sound pressure due to an increase in weight.
Furthermore, these diaphragms were inferior in mass productivity. The present invention has
been made to eliminate the above-mentioned drawbacks of the prior art, and a paper-made thin
film honeycomb core is used as a core material, and a paper thin film is used as a skin on both
sides of the core material. It is an object of the present invention to provide a speaker diaphragm
having an E / ? and an internal loss of an appropriate size and being excellent in mass
productivity by laminating the two through an adhesive. The most important point of the present
invention is to use a base material mainly composed of paper No. f as a member of the structure
of Germanium nicomsan, Germany. Paper Norongue is a material that has well-balanced
performance of E / ? and internal loss, and there are other factors such as the small dependence
on E / ? frequency and temperature, etc. Since it is low, there is a problem that the piston
movement area is narrow and the extension of the high range is small. The present invention,
unlike the conventional paper / 4 'luso veneer construction, has an extremely improved
performance because it has a two cam tended inch construction via an adhesive. -As described
above, the diaphragm with a nick-and-sand structure has a) a hollow honeycomb core as a core
material, so the density ? is small and the surface density does not increase even if the thickness
is increased, so the total weight of the diaphragm can be reduced. . b) Even if the elastic modulus
E is not necessarily large as in M, since the density ? ? ? is small, E / ? is a large value, and
the piston movement region can be made wide. C) The combination of a honeycomb core that is
resistant to compressive force has a large bending rigidity compared to a single sheet of paper,
and is less likely to cause divided vibration. d) Since the core material and the skin portion are
bonded with an adhesive, internal loss due to structural damping is large. Thus, it has a great
advantage as a speaker diaphragm that makes full use of the excellent acoustic characteristics of
paper. Hereinafter, an embodiment of the present invention will be described with reference to
the drawings. ?Example! In FIGS. 2 and 3, the core 1 which is a core material has a honeycomb
shape formed by arranging a large number of unit core cells 2 of a hexagonal cylinder adjacent
to each other. The unit core cell 2 is made of a thin film having a thickness of 0.05 m + and a
height of 3 mm, and the minimum diameter of the hollow portion is 9 ?. The skins 3 and 3 in
contact with both the front and back sides of the core 1 are bleached sulfates, which are made
from a mother rug with a degree of freeness of 25 ? ? SR, 2 m, density, Bt / all?fJ paper.
There is thin film -C. The core 1 as the core material and the skin portion 3 are pasted together
with a two-component cold curing type silicone adhesive 4 and pressed for about 30 minutes to
cure the adhesive to form a diaphragm. I got The performance of this diaphragm is shown in
Table 1 for the values of E / ? and internal loss according to the vibration lead method, and the
sound pressure-frequency characteristics as a speaker are shown in I of FIG.
[Example field] As a core material of the same material as Example I, core 1 and skin part 3 are
pasted together with a two-pack type stationary acrylic adhesive, and then pressure forming is
performed for about 30 minutes. The adhesive was cured to obtain a diaphragm. The
performance of the diaphragm of this embodiment is shown in Table 1. Table 1 shows the
performance of a diaphragm of a three-layer sandwich structure having a glass fiber and a
carbon fiber reinforced resin molded product as a skin portion in Table 1 and a diaphragm of
paper and mother-plate single plate. Sound pressure-frequency characteristics as a speaker of a
diaphragm having a three-layer sandwich structure in which a glass fiber reinforced resin molded
product is a skin portion are shown in FIG. As shown in Table 1 Table 1, although the diaphragm
of the present invention has E / ? smaller than that of the molded product made of glass fiber or
carbon fiber reinforced resin as a skin, internal loss is about 3 times . In addition, it can be
understood that both E / ? and internal loss are large in comparison with a paper pulso single
plate product. On the other hand, in the sound pressure-frequency characteristics of FIG. 4, since
the diaphragm I of the present invention has a large internal loss, the change of the sound
pressure characteristics is small in a relatively high frequency region. Therefore, distortion of the
sound is small, and good acoustic characteristics can be obtained. In addition to the above
embodiment, various cell sizes and thicknesses can be used for the paper core of the paper used
in the present invention, and the type of the raw material nokulup, for example, not exposed to
the paper of the skin portion. Although there are differences depending on sulfite pulp,
unbleached sulfate pulp and the like, in any case, the same effect as the above embodiment can
be obtained. Further, the nick core is a paper in which a polymer material is impregnated and
cured in paper and reinforced, and the skin part is a paper in which glass fiber, (inorganic fiber
such as carbon fiber or organic fiber such as Kevlar fiber) is mixed. include. As described above,
according to the present invention, a paper made of paper, nicks and cores is used as a core
material, and a paper thin film is laminated on both sides of this core material via an adhesive,
and a honeycomb sandwich structure diaphragm and As a result, [a speaker diaphragm having a
comprehensively well-balanced acoustic characteristic having a combination of a moderate E / ?
(specific elastic modulus) and a large internal loss] Also, compared to the conventional
diaphragms using metal or fiber reinforced resin moldings, paper is advantageous in terms of
material cost, but it is also possible to directly laminate the core film and the skin thin film with
an adhesive. Therefore, there is an effect such as excellent mass productivity.
4. Brief description of the drawings. FIG. 1 is a diagram of sound pressure-frequency
characteristics of a general speaker diaphragm, FIG. 2 is a partially cutaway plan view of a
diaphragm according to an embodiment of the present invention, and FIG. Similarly, a crosssectional view and FIG. 4 are characteristic diagrams comparing sound pressure-frequency
characteristics of the diaphragm according to the present invention and the diaphragm of the
employee. 1 ... core as core material, 2 ... unit core cell, 3 ... skin portion, 4 ... adhesive. In the
drawings, the same reference numerals denote the same or corresponding parts. Agent Shino
Speaker diaphragm
Fig. 1 7111 Mia ? Fig. 2 EndPage: 3 ?-IIalI-0 ? j i ?-? (spontaneous) 1.1 ? i / i'Jt 3 3, sleeve
11: do Person 5, column 6 of ?Detailed description of the invention? in the specification
subject to correction, contents of correction (1) Specification, page 3, line 7 [ииииииииииииииииии? ? ? ?
? ? ? ? ? ? ? ? Correct. (2) On the same page, page 12 to line 14 [polymer material... Socalled laminated] is corrected as "so-called thin film of polymer material or fiber reinforced resin
molded product is used as a skin portion". (3) On page 5, line 5 "Be sure to correct j as" not
necessarily ". (4) On page 20, correct the "thin film" to "paper thin film". (5) On the same page 6,
2 line 1-skin part 3.3 J .. is corrected as "skin part 3". (6) Correct the same page 4 line ?density
0.8 f / cyllJ as? density 0.7 f / ctl ?. (7) Same as 7) Correct the j5 line "... made as skin" as "...
made as skin". (8) On page 9, line 1 "epidermis" is corrected to "epidermis". EndPage or more: ?
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