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JPS56165904

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DESCRIPTION JPS56165904
Description 1, title of the invention
Production method of tone arm for record reproduction
3. Detailed Description of the Invention The present invention relates to a method of
manufacturing a tone arm for reproducing a record. More specifically, a record consisting only of
depositing a low density, high stiffness, high velocity material onto a metal surface by plasma
spraying, or a record consisting of the process followed by a subsequent heat treatment. The
present invention relates to a method of manufacturing a tone arm for reproduction. As the
characteristic 2'-no to be equipped with the tone reproduction for the record reproduction, it is
required that the rigidity is large, the mass is small, and the divided vibration does not occur.
Therefore, as a characteristic of the material constituting the tone arm, one having a low densityand a large Young's modulus E is required. This corresponds to the large specific modulus E / p.
Further, the speed of sound is proportional to the square root of the specific elastic modulus, but
the material of the tone arm requires low density, high rigidity and high speed of sound.
Conventionally, aluminum, titanium, magnesium, carbon fiber reinforced plastic composite
materials, etc. have been used as tone arms for recording reproduction, among which aluminum
and titanium are among these. For magnesium, the sound propagation speed of each material is
as low as 500m77B solo. In addition, even in carbon fiber reinforced plastic and plastic materials,
the resin of the matrix can bond the carbon fiber of high elastic modulus sufficiently strongly,
and the speed of sound as a composite material is generally lowered. . On the other hand, boron
and beryllium are used as low density, high rigidity and high sound velocity materials, but when
these materials EndPage: 13 · · · · are extremely poor in processability, they are used as a record
reproduction tone arm There is a drawback that the cost is very expensive. In view of these
points, the object of the present invention is to provide a low density, high rigidity, high sound
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velocity material layer on the surface of a formed metal, and as a whole, low density, high
rigidity, high It is an object of the present invention to provide a method of manufacturing a
sound reproducing l · n arm for reproducing a record. According to the present invention, a very
low cost recording reproduction tone arm is provided.
Production method of tone arm for record reproduction
Hereinafter, the present invention will be described in detail. First of all, the price, weight, rigidity
and sound of the metal. Somewhat faster aluminum, titanium, or alloys of these two are desirable,
but of course other nickels can be used. Next, a tube of a predetermined size made of the metal is
formed into a predetermined shape and size by a method such as pressing. Further, the formed
metal tube is polished with a 1500 to 3000 emery vapor or the like to roughen the surface. After
thoroughly washing with water, chemical corrosion is performed according to the method
suitable for the material of the metal tube, and then the plate is thoroughly washed with ion
exchange water to prepare a pretreatment. Thus, if the roughness of the metal tube is increased
by emery paper or chemical corrosion, and a fresh surface is still provided on the surface of the
metal tube, the sticking property of the plasma spray film is obtained by the so-called anchoring
effect or the like. Improve. Next, the metal pipe is placed on a several-phrase jig which is matched
to a predetermined shape 1 dimension. This jig needs to be devised so that four rounds of the
metal tube are plasma sprayed if necessary. Thereafter, a predetermined material is plasma
sprayed to form a predetermined amount of a sprayed film on the metal pipe. As the material to
be sprayed, low density, high rigidity. Select the high sound velocity interest. Also, in view of
adhesion to the metal tube, the difference in thermal expansion coefficient with the material of
the metal tube is also a factor to be considered. Low density and high rigidity as a plasma spray
material. If the material has high sound velocity, there is a difference in adhesion, difficulty of
thermal spraying, etc., but in the present invention, no limit of 5. In view of the characteristics of
the record reproduction tone arm, desirable materials include titanium, aluminum, chromium,
zirconium carbide, boride, nitride, boride and the like. Furthermore, more preferably, titanium
carbide (Tie), carbonized C1 (Cr3C2), zirconium carbide (ZrC), boron carbide (B4C), titanium
boride (TiB2 artificially populated chromium B2), zirconium boride ( ZrB2), titanium nitride (Tie),
zirconium nitride (ZrN), chromium boride (Or3Si) and the like. In addition, a desirable result is
obtained even if a mixture of these substances is used as a thermal spray material. Further, in
order to reduce the porosity of the plasma sprayed film 7 and maintain the mechanical strength
of the dog, it is desirable that the purity of the sprayed material be 95% or more, and that the
particle diameter be 10 μm or less on average. Further, the thermal spraying conditions include
the gas forming the plasma, the flow rate thereof, the flow velocity, the nozzle diameter of the
thermal spraying gun, the input power of the plasma generation reservoir, the supply amount of
fine particle interest forming the thermal spraying film, the spraying time and the like.
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Generally suitable conditions are: argon or nitrogen as gas, 6 pages flow rate 3-81 / s, flow rate
1.3-1-7 m / St material spray rate 480 m / s, input power 35-5 o KW, Under the conditions, a
plasma sprayed film is formed at a rate of 0.001 to 0.0031 + Im / min. Thus, although the tone
arm main body for reproducing the record is obtained, when the heat treatment in the inert
atmosphere is performed after the formation of the plasma sprayed film, the rigidity and the
speed of sound of the obtained tone arm improve to some extent. This effect is most exhibited
when borides, among which boron carbide (B4C), titanium boride (TiB2) chromium boride (CrB2)
zirconium boride and mixtures thereof are used as materials for plasma spraying. As the cause of
this, it is considered that the diffusion and the improvement of the adhesion of the sprayed film
act. As an atmosphere, an inert atmosphere is required. In particular, when the metal tube is
made of titanium or aluminum, the atmosphere needs an argon atmosphere or a vacuum
atmosphere of about 10 Torr. If the metal tube is made of titanium, a nitrogen atmosphere is also
not possible. EndPage: 2 了 -1 The temperature of the heat treatment should be higher if it is
acceptable, but it is mainly determined by the material of the metal tube, and the material is
about 1000 ° C for titanium, 600 for aluminum It is around 'C'. The lower limit of the
temperature at which the invention is exhibited was about 450'C. Thus, a tone arm main body for
reproducing a record is obtained. Thus, the present invention provides a low-cost, massproduction method for producing a tone arm for reproducing a record, and the resulting l · n-arm
has a low density, high rigidity and high speed of sound as a whole. And have excellent acoustic
characteristics. Next, an embodiment of the present invention will be described. EXAMPLE 1 The
surface of a titanium tube molded into a predetermined shape 2 dimensions is polished with
2Ooo number of emery paper to make the surface immune, and then the temperature is kept at
60 ° C., 1 as a chemical polishing solution. Soak for a minute. The chemical polishing solution
contains distilled water in a volume ratio of 5. Nitric acid is 4. The hydrofluoric acid is a mixture
of 1. Thereafter, it is washed with ion exchange water to prepare pretreatment. Next, it mounts
on the fitting jig which the shape 2 dimension matched. In addition, the attachment jig was
devised so that it could be thermally sprayed on four circumferences of this titanium pipe. Next,
titanium carbide fine particles having a purity of 96.5% and an average particle diameter of 8
μm are argon plasma sprayed on the surface of the titanium tube. Spraying conditions are:
nozzle diameter 4.6 mrn of the thermal spray gun and plasma generation output 50! At a gas
flow rate of 51 / s and a gas flow rate of 1.7 pieces, the thermal spray rate of titanium carbide
under this condition is 48 o 77 I / s.
The spraying time is determined by the thickness of the sprayed titanium carbide film formed on
the titanium pipe. In this case, it was 0.2 mm. Furthermore, the temperature of the titanium tube
at the time of thermal spraying is about 170 ° C., and there is no temperature rise that causes a
problem. The characteristics of the record reproduction tone arm obtained in this manner are
excellent, as a whole, with a density of 4.5 g / c, i, and a longitudinal elastic coefficient of 8000
TL / S at 3Q · 0 × 10-no sound velocity, Met. In addition, it is as inferred that page 9 which can
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manufacture the outstanding diaphragm for speakers by such a method. EXAMPLE 2 The surface
of an aluminum tube molded into a predetermined shape and size 2 is polished with a # 1500
emery vapor to make the surface impermeable, and then dipped for 5 minutes in a chemical
polishing solution maintained at a temperature of 70 ° C. . In the chemical polishing solution,
distilled water is 10.% by volume. Sodium hydroxide is a mixture of two. Thereafter, it is washed
with ion exchange water to prepare pretreatment. Thereafter, under the same conditions as in
Example 1, chromium carbide fine particles having an average particle diameter of 6 μm were
plasma sprayed to form a sprayed film of 0-1 mm on the aluminum pipe. The surface
temperature of the aluminum tube at the time of thermal spraying was about 180 ° C. In
addition, the characteristics of the obtained record playback tone arm as a whole, the density 2.9
f! / C 'longitudinal elasticity e, mosquito 20 x 103 Kgp. The sound speed was 8 ooom / s and it
was excellent. In addition, it is as speculated that an excellent speaker diaphragm can be
manufactured by such a method. Pretreatment similar to that of Example 2 is applied to the
surface of an aluminum tube molded into a predetermined shape and a two-dimensional shape,
and plasma-sprayed silicon carbide fine particles having an average particle diameter of 1 oμm
under the same conditions as in Example 2. Then, a 0.17 n1 n sprayed film was formed. The
surface temperature of the aluminum tube at the time of thermal spraying in this case was
190.degree. Moreover, the obtained deposited layer was somewhat lacking in adhesion. The
characteristics of the recording reproduction tone arm obtained in this manner have a density of
2.5 g / c4 + longitudinal elastic modulus of 18 × 10 竪 9. The sound speed was 8200 pieces and
it was excellent. Next, the aluminum tube having the above-mentioned deposited layer was heattreated at 620 ° C. for 2 hours in an argon atmosphere. The characteristics of the record
reproduction tone arm obtained in this way have an overall density of 2.65 g / c4. The
longitudinal elastic modulus was 9600 rn / s at a sound velocity of 25 × 10 'Kp2 °, showing a
further improved characteristic.
The adhesion of the deposited layer was also improved. EndPage: 31'1, <-; · · · As described above,
in the method of manufacturing a tone arm for reproducing a record according to the present
invention, a low density, high rigidity, high velocity material is deposited by vacuum evaporation
or sputtering. It is not necessary to heat the metal tube to 300 ° C. or higher, as in the case of
the case, and the plasma spraying method proposed by the present invention is excellent in mass
productivity as compared with the vacuum deposition method and the sputtering method. Thus,
the effects of the present invention are remarkable. Name of Agent Attorney Nakao et al. 1
person 20-EndPage: 4
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