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Description 1, title of the invention
3. Detailed Description of the Invention In the present invention, the cantilever of the 0 record
reproducing cartridge relating to the cantilever for record reproduction (a word desired as-, an
elastic modulus is dogble to extend a reproduction frequency band to a high range, and a divided
vibration occurs It is required that the internal loss is large because there is no internal loss, and
the density of the material is small to reduce needle point equivalence disease, and that the
molding process is easy and the product is finished evenly and as a product. . By the way,
although aluminum, titanium, etc. have been conventionally used as the material of such a
cantilever, these materials are excellent in processability, and moreover, the density is 2sso (Kg /
d)% of titanium 4540 (KfEndPage: 1 / 11rl). 2.) It was difficult to produce a high performance
cantilever having a relatively small but small elastic modulus and a small internal loss. As a
representative material with large surface modulus and small density, IJ-rium is a typical
material, but even with this, internal loss is small and performance is not sufficient, and beryllium
is mechanically brittle in its processability, Therefore, since processing into a capillary tube is
very difficult and exhibits toxicity, preventive measures at the manufacturing stage are expensive
and there is a drawback that the product cost becomes high. Further, as a material for a
cantilever, a composite material in which a graphite powder is mixed with a caking polymer
material such as polyvinyl chloride has been proposed. In this material, it has properties
comparable to those of aluminum and titanium in terms of density and elastic modulus, and in
terms of internal loss and ease of forming, these gold 4 · ′ ′ are much more advantageous than
the material M. However, within f3I! In the point of loss, it can not be said that it is enough yet
and further improvement was desired. This problem has been solved in the conventional
problems that arise from the present j), and its object is to provide a cantilever having high
internal loss and high td + iφlit ′ ′ high elasticity. That is, according to the present invention,
for a cantilever formed of the mixed material of thermoplastic ffftll & and flaked graphite powder
proposed by the present inventors, for example, polyvinyl chloride and polyvinylidene chloride as
the thermoplastic resin thereof Thus, it is an object of the present invention to provide a
cantilever characterized in that a plurality of glass transition points higher than normal
temperature and lower than normal temperature are used. Generally, a polymer material has the
property that the elastic modulus decreases at temperatures higher than the boundary of the
glass transition point, and the internal loss rises sharply. Therefore, in the case of a cantilever
formed by kneading a polymer material having a glass transition temperature higher than normal
temperature and a polymer material lower than the normal temperature, the internal loss can be
freely controlled by adjusting the compounding ratio of the materials. .
In order to improve the elastic modulus of the cantilever, VC may be mixed with a flake-like
inorganic powder such as flake-like graphite powder in the material, and the powder may be
oriented along the surface of the molding when the cantilever is molded. The present invention
has been made in view of such points, and will be described in detail below. As the thermoplastic
resin, polyvinyl chloride (pvc), a copolymer of PvC and polyvinyl acetate, a copolymer of pvc and
polyacrylonitrile, and the like are used as those having a glass transition point higher than
normal temperature. Polyvinylidene chloride (PVDO), a copolymer of PVO and co-cocopolymer
PvDc and polyacrylonitrile, etc. are used for PVD when the glass transition point is lower than
normal temperature. The flaky graphite powder preferably has an average particle size of about
20 μm or less, and more preferably 5 μm or less. Further, if the compounding ratio of the
graphite powder to the thermoplastic resin is in the range of 10 to 90 wt% of the graphite
powder and 90 to 10 wt% of the resin, improvement of elastic modulus by the graphite powder
can be expected, and the formability of the mixed wire material is impaired. Although the
brittleness of the molded product hardly occurs, particularly, the improvement of the
characteristic of the molded product is remarkable when 50 to 75 wt% of the graphite powder
and 50 to 25 wt% of the resin are used. In manufacturing the EndPage: 2 cantilever, first, the αi
fat 1 and the graphite powder 2 are kneaded while heating to a temperature at which the resin is
softened by a kneader or roll as shown in FIG. 1 (IL). Add plasticizers and stabilizers if necessary.
Here, in the case of intermingling with a roll, the intermingled material 3 is obtained as a rolled
sheet material, and as shown in FIG. 1 (b), it becomes a material in which the graphite powder 2
is oriented parallel to the sheet surface, The modulus of elasticity of the material itself is high.
Next, the sheet-like mixed wire material 3 is formed into a desired cantilever shape as shown in
FIG. In this molding, as shown in FIG. 3 (&) (b), the material 3 is rolled into a cylindrical shape
and bonded with [IQ] mesh 4t-thermostatic bonding or an adhesive. Thereby, the graphite
powder 2 is oriented along the surface, and the elastic modulus is improved. In order to further
improve the properties of the cantilever, carbonization or graphitization is performed. This
means that the cantilever obtained by the above self method is held in a predetermined shape VC
fit and held in shape, and first subjected to preheating for insolubilization (1iii firing in a fc state,
then the mold is removed, and a non-oxidizing atmosphere is Alternatively, carbonization at
about 1200 ° C. or graphitization at about 2500 ° C. in a vacuum may be performed by baking
at a temperature of 10 to b.
The infusibilization treatment is carried out by gradually raising the temperature of the material
to about 350 DEG C. in an oxidizing atmosphere and then heating and firing the material in an
oxidizing atmosphere. The invention will now be described on the basis of examples. FIG. 4
shows that the compounding ratio of the resin and the graphite powder is fixed at 1: 2 (weight
ratio), and the combination of the resin is a copolymer of PvO and polyvinyl acetate as one
having a high glass transition point. How the elastic modulus and internal loss of the cantilever
formed after rolling were changed when the composition ratio was changed between PVDC and a
copolymer of polyacrylonitrile as those having a low glass transition temperature It shows. In
addition, about 1/10 of plasticizer (BPBG) ldm fat and stabilizer (lead stearate) were added in the
ratio of about 1150 of resin. As can be seen from the figure, even if the compounding ratio of the
elastic modulus stop pvnc shown by the dotted line increases, it does not change so much, while
the internal loss -δ shown by the solid line rises dramatically with the increase of pvnc. Also, is
the density ρ of this cantilever about 1.84? /cf/lである。 Now, the physical properties
when the compounding ratio of PvDC is 30 wt% and PV (70 wt%) are as shown in the following
table in comparison with those of other materials. In addition, this cantilever mold is held and
subjected to 1 to b baking and infusiblizing treatment to about 300 ° C. in an oxidizing
atmosphere, and then at a temperature ratio of 10 to b in a non-oxidizing atmosphere to 1200 °
C. The characteristics of the force and chiller obtained by heating and carbonizing are shown in
the same table. Furthermore, the properties of the cantilever obtained by heating the abovementioned cantilever up to about 2500 ° C. and graphitizing are also shown in the same table.
EndPage: 3 As is apparent from the above table, according to the embodiment of the present
invention, the addition and orientation of the graphite powder show light weight and high
elasticity, and high internal loss is caused by the presence of one having a low glass transition
point in the resin. I can do it because I can achieve it. That is, the specific elastic modulus can be
at least as high as that of titanium or aluminum, and the internal loss shows a value comparable
to that of paper by more than 10 times that of paper. Furthermore, the carbonization treatment
improves the elastic modulus by about 80%, and the graphitization treatment reaches about 2.5
times as many as that of the graphitization treatment, resulting in a cantilever whose property is
further degraded. According to the present invention, light weight 9 high elasticity and high
specific elastic modulus can be achieved by the presence of graphite powder oriented along the
surface in the resin, and a resin with a low glass transition point is present Thus, high internal
loss can be achieved, and a lightweight, highly elastic and large internal loss cantilever can be
In addition, the characteristics can be arbitrarily controlled by adjusting the compounding ratio
of graphite powder, the type of resin material, and the existence ratio of low glass transition
point in 1C resin material, etc., and the material is inexpensive and has good moldability. In
combination with being a cantilever, cantilevers of various desired properties can be provided
4. Brief description of the drawings Fig. 1 (IL) (b) is a cross-sectional view of the mixed wire
material used in the present invention, Fig. 2 is a cross-sectional view of one embodiment of the
present invention, Fig. 3 (a) (b) Is an explanatory diagram of the above-mentioned manufacturing
method, and FIG. 4 is 4? It is a sex change figure. 1 · · · Thermoplastic resin 2 · · · Graphite powder
3 · · · mixed wire material · · · · · Cantilever EndPage: 4 continued from the first page 0 inventor
Shiro Yoshino-Omori Ward Tokyo Omori Ward 4-5 15 No. 5 Pioneer Corporation Omori factory
0 inventor Araihara 2 Tokyo Ota ward Omori Ward Ocori District 4 chome 15-5 Pioneer
Corporation Omori factory 0 inventor Kobayashi Walnut Restaurant Sawa City Flower Garden 4
chome address Pioneer Corporation Tokorozawa factory EndPage: 6 Warning: Page discontinuity