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JPS5735497

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DESCRIPTION JPS5735497
Description a's n 'tr (no change to the contents)
Boronization of metal diaphragms
Detailed Description of the Invention The present invention relates to a method of processing a
boronated metal diaphragm such as a speaker in an audio device. Conventionally, for a speaker
in an audio device, a titanium foil or the like which is light in weight and good in formability is
used after being processed into a predetermined shape. In the case of the speaker made of the
metal diaphragm described above, a specific vibration mode was generated in the entire
diaphragm, or a peak was generated in the frequency characteristic of the high frequency range
to significantly impair the sound quality. In order to improve this characteristic, the boroso
treatment is used as one method of increasing the ratio Tn / p of the Young's modulus E to the
density p (hereinafter referred to as "Kun elastic modulus"). As main borinization methods, +1 +
gas method, (2) electrolysis method, and (3; powder method are put to practical use. However, in
the case of the gas method, handling is inconvenient in processing because even a trace amount
of diporan (B * "s) and the like is used to cause harmful gases to the human body. In the
electrolysis and the method, it is difficult to make the temperature distribution of the molten salt
used uniformly and uniform, the variation of the ionization density is likely to occur, and the
boronization may be uneven. In the powder method, in order to embed a metal diaphragm, a
large amount of expensive boron etc. is used, and the manufacturing cost is high. According to P.
Reiding (page 45), it is noted that if the sample is not buried in boron, boronation does not occur.
However, even if the sample is not buried in the pot, it can be boronated if it is heated with a
substance such as magnesium, but the use of highly flammable magnesium makes handling and
storage complicated. The The present invention solves the above-mentioned drawbacks. EndPage:
1 is an easy-to-handle, safe and uniform boronizable metal diaphragm with excellent acoustic
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characteristics. It provides the law. Hereinafter, it demonstrates with drawing. FIG. 1 is a crosssectional view of the apparatus of the boronation method studied. In the figure, 111 is a sample,
(2) is a frame for suspending the sample 111, 131! d Boron, (41 is Boron (3) and Sample + 11).
Container (6) is a lid. FIG. 2 is a cross-sectional view of “conventional Hv1” for boronating a
titanium diaphragm by heating boron and magnesium. Ilφ is a titanium diaphragm, (3: boron, (6)
magnesium, (force is a diaphragm for holding a titanium diaphragm (41; (8; boron (3) and
magnesium (61 gas (91 is a furnace, (10) is a heater). FIG. 8 is a cross-sectional view of an
apparatus showing the boronation treatment method of the present invention.
Is a titanium diaphragm, (Illf high purity boron, 篠 (a titanium diaphragm (a frame for holding
61, 18) is a passage hole for passing high purity boron gas, 0: 1 is high purity Boron (+21 and a
former for holding a frame, 041 is a heat resistant container, (10) is a heater, and 051 is a
furnace body. As a result of investigations by the inventors of the present invention, as shown in
1M, in detail, the sample +11 can not be boronated by heating unless it is buried in the boron (3).
It turned out that it is because it is not high purity and because the pressure in the container (3)
is reduced to high vacuum and not heated. In the conventional example shown in FIG. 2, the
titanium diaphragm 'l · · is provided with a partition plate (7) provided with a gas passage hole
(8) for partitioning the furnace (9) placed in boron (3) and magnesium (e + ′). Placed on top, the
furnace (9) is sealed with a lid 1 fi +, the furnace (91 is heated by the heater (10) to around 1000
° C., boron (3) and magnesium (61 become gas, gas passage holes ( It reaches the boron
diaphragm (4) through 8), and boronization proceeds. In the method according to the present
invention shown in FIG. 3, the titanium diaphragm f11 is placed on high purity boron in a heatresistant container f141 (placed on a container 0 covered with a sheet and held on a solid
support (12 Is evacuated to a high vacuum (10-'Torr to 10'-Torr) and heated to a predetermined
temperature of 900 to 1200C by a heater 1101 in a furnace. At this time, the high purity boron
(11) is vaporized, passes through the gas vent 18), reaches the titanium diaphragm →, and is
boronated. High purity boron (for example, boron (amorphous) manufactured by Wako Pure
Chemical Industries, Ltd.) is used, but as the impurity content of high purity boron (11) is
smaller, the boronation reaction is performed more rapidly. In the method of boronating a metal
diaphragm according to the present invention, boron can be borated with a purity of 99 or more,
and for boronization, 9αθ or more is practically preferable, and 99. More than 99 inches is
more desirable. According to the boronation treatment method of the metal diaphragm of the
present invention, the titanium foil diaphragm and the heat resistant container containing high
purity boron are decompressed to a high vacuum and heated to be treated by boronization. Can
be easily, safely and uniformly boronated. The composition of the surface of the boronated
titanium foil (30μ) is TiB, ,, as a component, and under the boronization conditions of 1200 °
C., the specific elastic modulus shows 5.5 × 10 1 / 'See', and titanium It is about 2.5 times the
specific modulus of elasticity.
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Accordingly, the acoustic characteristics were significantly improved over the boronized ninewave plate having a mixed composition of TiB and TiB. In addition, this boronation treatment
method can be used also for the boronation treatment method of other audio equipment parts
etc. As described above, according to the present invention, boronization can be performed
easily, safely and uniformly, and the metal-made diaphragm having excellent acoustic
characteristics can be subjected to boronization treatment.
4. Brief description of the drawings. FIG. 1 is a cross-sectional view of the device of the
boronation method studied, and FIG. 2 is a cross-sectional view showing an example of a
conventional device of the boronation treatment method of titanium diaphragm, FIG. 8 is a crosssectional view showing an embodiment of the apparatus for the boronization treatment method
of a metal diaphragm according to the present invention. In the figure, fi + is a frame for hanging
the sample and 121k'i sample, (3) is boron, (41 is a container, (6) is a lid, (61 is magnesium, (7) is
a partition plate, (8) is Gas passing hole, (91 for furnace, (101 for heater, (Ill for high purity
boron, θ 匈 for rack, 03 for pan, ■ for heat resistant container, 051 for furnace body,! is a
titanium diaphragm EndPage: 2. In the drawings, the same reference numerals denote the same
or corresponding parts. Agent Shino Shinno-Revised field (not changed to contents) Fig. 1, Fig. 2
End Page: 3 Procedure Amendment (Method) 5 ° 6 ° Patent Office Secretary 1, Case display
Japanese Patent Application No. 55- No. 110 987 2 ° 発 1 (I (7) Name J 31 ボ ロ ン 振動 ボ ロ
ン 振動 振動 ボ ロ ン ボ ロ ン 法 、 、 補正 者 補正 補正 日 付 日 付 日 付 日 付 日 付 日 付 昭和
昭和 月 月 月 月 月. Target application for amendment 1, Request for contents of specification
and drawing correction, clear statement of specification and drawing (no change in contents).
LEndPage: 4
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