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FIELD OF THE INVENTION The present invention relates to a speaker center cap provided at the
center of a cone-shaped diaphragm. In general, paper, -phenol resin impregnated woven fabric,
polynisdelfill 11 and the like are often used as the interest of the speaker center cap in general.
Since this speaker center cap has a large effect 1 on the frequency characteristics of the speaker
itself, particularly in the high frequency band, it has a high specific elastic modulus and low
density like the diaphragm. , Takauchi il (physical properties of loss are required. Among these
physical properties, the specific elastic modulus is mainly related to the band, the density to the
efficiency, and the internal loss to the flatness of the frequency characteristic. However, in the
case of paper, although physical properties are superior, since natural pulp does not grow in
production, there is a need to perform individual sheet forming and heat press forming, and the
variation among L knots Also, it has the disadvantage of poor reliability such as light resistance,
etc. and water resistance 2 side 1 wet f 1 °. Phenolic resin-impregnated woven fabrics are low in
density but have the disadvantage of reduced efficiency due to their air permeability. The
polyester film can be formed by ripening and is excellent in surface J aqueous but has a low
internal loss, a high density ((138 da / Ca), and a low specific elastic modulus (16 × 1 d0cl /
5ea2). There is also a problem that deformation due to molding strain is likely to occur in a high
temperature atmosphere (around 100 ° C.). 9, the purpose of bright light Non-invention is to
solve such conventional defects, low density, high specific modulus, high internal loss winter 1'l:
h: / l: 'sus, high efficiency, It is an object of the present invention to provide a speaker Senku /
Yanozoke capable of carrying out 1 'support of a frequency 1'1 in a wide band and high
frequency band. Inventive structure The inventive speaker center cap f'l, and a mixture of 4methylpentene polymer and polypropylene are used to advantage. 4-Methylpentene polymer is
most suitable for lightening and lowering density in polymer resin, has excellent heat resistance
with a melting point of 245 ° C, a softening temperature of Vicat of 170 ° C, and has a
relatively high elastic modulus. Also high. On the other hand, it has a disadvantage that the glass
transition temperature is near 29 to 50 ° C.j and the melt viscosity is low and the vacuum
forming is 1 eta 11. We found that a blend of FCM 4-methylpentene polymer and polyzolopyrene was effective to eliminate these drawbacks. This effect goes up further by adding
reinforcements less than 2 ovo 11) VC Eli. Reinforcing (min 4 as Altli-like (mica, scaly graphite),
hollow particles (glass balloon, carbon · 'Luno), inorganic filler (talc, calcium carbonate, titanium
dioxide etc.), whiskers (copper).
Polyoxymethylene) is effective. Also, the adhesion strength of Eri is considerably reduced to 1-1
by strengthening (J). The content of polypropylene is desirably less than twice the volume
fraction of 4-methylpentene polymer in terms of density and softening temperature. In this case,
the softening temperature is too low in terms of thermal PIE. As described above, by using a
blend of 4-methylbenzone poly-7 and polypropylene as a politician, it is highly efficient and
broadband compared to the conventional center gear tube. The frequency response in the high
region can be flat, and furthermore, a high-speed, continuously producible center cap can be
obtained which is also heat-resistant, 11 il aqueous, weatherproof. Description of the Examples
Example 14-Methylpentene polymer (March Petrochemical Corp.). Trade name TPX DX-845)
80vo1% and poly-zolopyrene (Ube Industries, Y101J) 20701% i knead well with punnoder to
make master perenot, and then use this pereso) k to make 7 of thickness 300I1117 -Made t-k.
Next, the sheet was heated at a deep infrared peak and vacuum formed to obtain a center cap.
The physical properties of this sheet are shown in Table 1. By combining with poly-zolopyrene!
The film forming property and the formability of 74-methylbenzone were greatly improved n,
and the rapid change in physical properties at the glass transition temperature was also
suppressed. The relationship between the content of polypropylene and the softening
temperature is shown in FIG. The softening temperature is a temperature at which a sample piece
of 1 cm × 3ctn × o · 3 mm is bent by I Cm. It can be seen from FIG. 1 that the softening
temperature drops sharply when the polypropylene content exceeds 65%. Frequency
characteristics of the center cap and polyester film center cap not shown in FIG. 2-J-8 In FIG. 2,
curve A is the sound pressure frequency characteristic of this embodiment, and curve B is the
conventional sound. Pressure frequency characteristics. It can be seen that the second
embodiment does not have a high frequency limit, a high efficiency, and a small increase in high
frequency n. The sound pressure frequency characteristics are as follows: a 21-inch diaphragm
made of natural pulp with a curvature of 200 and a diameter of 11C1I11 is provided with a
center cap with a diameter of fi60jnm between curvatures 2B, and a voice coil with a diameter of
16mm is coupled to a speaker Built-in, measured at the input '(zIW, 1777 T away from the
loudspeaker as a microphone. Example 2 The same 4-methylpentene polymer and
polyzoropyrene as in Example 1 were each added with 6Q vo1% + 3ovot%, and further mica
(Kuraray, Sozolite 325 S) i 10vo1%, to make a sheet in the same manner as Example 1, Work
(The center cap was obtained by empty molding.
Table 1 shows the physical properties of this / -1. Although the density is a little higher, bullet
IA1: the rate is higher and the adhesion and heat resistance are also improved. The relationship
between the mica content and the flexural rigidity shown in FIG. 3 shows that the flexural rigidity
has a peak with respect to the content of the reinforcement 7J-6, and if too much reinforcing
material is added, the rigidity is reduced. Therefore, it is necessary to reduce the content of
reinforcement to 20 vo 1% or less. In addition, rapid changes in physical properties (elastic
modulus, internal loss) at the glass transition temperature could be almost eliminated. In addition
to mica, squamous graphite, balloons, talc, whiskers and the like were effective as reinforcing
materials. Effects of the Invention As described above, according to the invention, the lightest 4methylpentene polymer in the polymer resin is used for weight reduction and the polypropylene
resin is blended in the polymer resin to reduce the density. Low density, high specific modulus.
Each physical property of high internal loss is satisfied, high efficiency, wide band. It is possible
to obtain a flat center gap of frequency characteristics at high frequencies. Also, in terms of
manufacturing, high-quality, continuous, high-speed production is possible with thermoforming
capability. 0 Water absorption! There is almost no hygroscopicity and the softening temperature
is high, so it has excellent reliability.
Brief description of the drawings
1 shows the relationship between the polypropylene content and the softening temperature in an
embodiment of the non-invention center cap, FIG. 2 shows the sound pressure frequency
characteristics of the center cap and the conventional sencucap, FIG. It is a figure which shows
the relationship between a mica containing amount and bending rigidity in the other Example of
the non-invention center cap.
Name of agent Attorney Nakao Toshio has 1 person Figure 1 Figure 2 '@' tyl Il, (In
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