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TECHNICAL FIELD The present invention relates to a center cap for a sound 11 diaphragm.
BACKGROUND ART Generally, a center cap for an acoustic diaphragm is high in rigidity and has
appropriate internal loss, and a ratio of Young's modulus E to density ρ, a large [ratio of β [is
required. . As conventional materials, paper, phenolic resin impregnated woven fabric,
polyethylene terephthalate film, metal plate and the like have been used. Since the center cap for
the acoustic diaphragm has a great influence on the frequency characteristics of the diaphragm
itself, particularly in the high frequency band, physical characteristics such as high specific
elastic modulus, low density, high internal loss and the like are required like the diaphragm.
However, while paper has a large internal loss and flat properties of 1 q, its stiffness is small,
resulting in split braking from the low frequency band, which not only degrades transient
characteristics and distortion characteristics but also absorbs moisture and makes it difficult to
trade off. It causes changes and deterioration of sound quality is likely to occur due to aging.
Moreover, in the case of paper, papermaking is carried out one by one, and a drying press
process is required, and the thickness density becomes uneven due to the material and shape in
terms of production, the physical characteristics are unstable, and advanced to obtain stable
characteristics. Skill and experience are required. Polyethylene terephthalate films are
thermoformable and have excellent water resistance, but have the disadvantages of low internal
loss and low specific modulus. Moreover, in the high temperature atmosphere of about 100 ° C.,
there is a problem that it is easily deformed. With regard to metal plates, although having high
rigidity, it is difficult to damp the high-frequency band because the internal loss is small, and
there is a drawback that the material is so hard and brittle that the processability is bad. Phenolic
resin-impregnated woven fabrics have the disadvantage of low efficiency but low efficiency due
to their air permeability. As apparent from the above, paper, phenolic resin-impregnated woven
fabric, polyethylene terephthalate film and metal plate were not necessarily satisfactory as a
center cab material for an acoustic pregnancy moving plate. Accordingly, the object of the
present invention is to solve the above-mentioned problems, and to provide a center cab for a
sound Il sliding plate having a large internal loss and a low density. The resonator amplifier 1 of
the present invention is formed by mixing a titanium fiber or potassium titanate fiber with a
polymeric thermoplastic resin such as polypropylene, a copolymer mainly composed of
polypropylene, or a mixture thereof. It is characterized in that it is formed of a material.
Implementation In the following, one embodiment of the present invention will be described
based on tables and figures. In order to form a film from polypropylene, a copolymer mainly
composed of polypropylene, or a mixture thereof and a titanium fiber or a potassium titanate
fiber as a raw material, first, a ratio of vo 1% as shown in Table 1 ( Body B!
l Mix the raw materials at the mixing ratio) and breathe the beretized material. Thereafter, the
pellet material is film-formed while heating to a sheeting temperature of 230 ° C. to 260 ° C.
by an extrusion molding machine, and passed through several stages of rolling cooling rolls to
obtain a film of any thickness. . Thereafter, the film is heated and softened with a heating plate of
about 150 ° C., and formed at a sheeting temperature of 230 ° C. to 260 ° C. in a vacuum or
pressure atmosphere using a heated forming kana mold of a predetermined shape Get a center
cap. The characteristics of the obtained center cap are shown in Table 2. As a comparative
example, a center cap is manufactured from a mixture of polypropylene and mica powder
according to the manufacturing method of the present invention, and the mixing ratio is shown
in Table 1. Further, in Table 2, characteristics of a center cap having the same shape as that of
the present embodiment are also described as a conventional example. As is apparent from Table
1 in Table 1, the center cap of this example has a characteristic value higher than that of the
conventional example. Paper cone, Boriba O Bi has obtained more than double the value. In
addition, a center cap that withstands use even if the potassium titanate fiber-to-polypropylene
body ratio is 5:95 can be replaced. The potassium titanate (Ill) used in this example is Tismo
(trade name I, manufactured by Ohka Chemicals Co., Ltd., having an average mH length of 20 to
30 μm 1 and an average fiber H diameter of 0.1 to 0,3 μm) . Further, the sound pressure
frequency characteristics of the center cap of the present invention and that of the conventional
one are as shown in FIG. 1 under the same measurement conditions. The characteristics shown in
A are those of the center cap of the present invention, and the characteristics shown in B are
conventional. It can be seen that the center cap of the present invention has a flat frequency
characteristic in the high frequency range. Further, the center-1 top of the present invention has
little hygroscopicity and is excellent in heat resistance, and can be mass-produced. As described
above, according to the present invention, the physical properties required for the center cap of
low density, high specific elastic modulus and high internal loss are satisfied, and high efficiency,
wide band, high frequency band An acoustic diaphragm center cap with a flat characteristic is
manipulated. In addition, the center cap is excellent in reliability because it has little
hygroscopicity and a high degree of softening water. Furthermore, by containing a fine titanic
acid fiber in the polymer-based thermoplastic resin, the forming surface becomes smooth and
faithful to the fine change of the forming mold also in the manufacturing process, and the
forming surface becomes smooth. The filling effect inside the resin is uniform, and it is difficult to
generate an unreinforced part even in detail, and the amount of cracking (slip, warpage, etc.) at
the time of molding is reduced.
4, a simple drawing illustration is a graph of sound pressure frequency characteristics comparing
the center cap of the present invention and the conventional one. procedure? fliJE (Spontaneous)
January 17, 1984 Patent Application No. 140372 2, Name of Invention Center cap 3 for acoustic
swing plate, person with correction Case relationship Patent applicant Residence Meguro-ku,
Tokyo Meguro 1-chome 4-1 Name (501) PIONEER CORPORATION (1 outside) 4, agent 〒 104
house paternity Ginza 3-chome 10-9 6 Chuo-ku, Tokyo, number of inventions increased by
correction None 7. Object of correction [Claim of claim] and [claim of the invention 8 [Details of
the invention, content of correction (1) column of the claim as given in the attached sheet (2)
column of the detailed description of the invention (i) Correct "polyethylene terephthalate film J"
with "bole ethylene terephthalate film" on page 3, line 10 to page 3, line 11 of aS. (Ii) Correct the
ratio of vo1% (volume mixing ratio) J to the ratio of rwt% (weight mixing ratio) on page 4 line 11
of the specification. (Iii) Correct the "raw material and volume mixing ratio (vo1%)" in the first
frame of Table 1, first column on page 6 of M4 to "raw material and weight mixing ratio (wt%) J".
(D) On page 8, line 3 of the specification, [volJ is corrected as "wtJ. 9. Relationship with the case
other than the above corrections Patent applicant Residence One of the names of the town
Shinoji Shionogi No. 954 in Omuro, Muromachi, Mogami-gun, Yamagata Prefecture Mojo l! Kikai
Co., Ltd. [Attachment] [2, Claims (1)] It is formed by mixing titanium mlt or potassium titanate
fiber with a synthetic resin consisting of polypropylene, copolymer consisting mainly of
polypropylene, or a mixture of these. Center cap for acoustic diaphragm. (2) A method according
to claim 1, characterized in that W [% (weight mixture is in the range of 5:95 to 40:60) between
said titanium II fiber or said potassium titanate IIN and said synthetic resin. Center cap, as
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