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JPS62200999

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPS62200999
[0001]
The present invention relates to a diaphragm for a speaker. An electrodynamic speaker as shown
in the cross-sectional view of FIG. In such an electrodynamic speaker, the pole piece 2 is mounted
at the central portion of the back plate 1 and the annular magnet 3 is mounted at the peripheral
portion thereof. The annular plate 4 is mounted on the magnet 3 while the hole forms a magnetic
gap with the pole piece 2. A voice coil bobbin 6 carrying a voice coil 5 is vibratably inserted into
the magnetic gap, and the voice coil bobbin 6 is supported by a damper 7. A cone-shaped
diaphragm 8 is coupled to the voice coil bobbin 6 at its central portion, and a center cap 9 is
crowned at its end. The outer peripheral edge of the cone-shaped diaphragm 8 is supported by a
frame 11 which is fixed to the plate 4 through an etch 10. The etch 10 is further secured to the
frame 11 by a gasket 12. The lead 5 'of the voice coil is connected to a terminal 14 provided on
the side surface of the frame 11 through the tinsel wire 13. In such a speaker, the diaphragm 8,
the center cap 9 and the voice coil bobbin 6 are a speaker moving body. In order to faithfully
convert an input signal to the voice coil 5 into an acoustic output in the electrodynamic speaker,
it is necessary that these loudspeaker diaphragms integrally perform a piston movement ideally.
This means that the diaphragm, in particular the diaphragm and the center cap, must be rigid
and at the same time have adequate internal losses to attenuate unwanted vibrations. Further, in
order to enhance electroacoustic conversion, it is desirable that the diaphragm and the center
cap have a large Young's modulus and an appropriately large internal loss. In recent years, the
application of such a speaker has been greatly expanded, and a speaker diaphragm having a
design that is excellent in appearance in terms of design while satisfying the above-described
characteristics is strongly demanded from the market. Therefore, in general, a full range, an
imaging plate such as a woofer can be easily dyed with a dye in these diaphragm manufacturing
processes, and can control various physical properties by a paper making method such as mixed
paper, particularly a valve. Those mainly composed of fibers are widely used. However, for
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example, in the case of dyes, the problem of lack of definition in the color tone may occur, and
color variations may occur depending on the conditions of dyeing. Moreover, the diaphragm for
speakers which dye | stained by dye had some inferior to light resistance.
Although there is a pigment as a supplement to the light resistance by the dye, when the pigment
enters inside the diaphragm, there is a problem that the bonding between the valve fibers is
inhibited and the Young's modulus is lowered. Therefore, an object of the present invention is to
provide a speaker diaphragm having light resistance while maintaining physical property values
such as rigidity and internal loss. The speaker diaphragm of the present invention comprises a
substrate made mainly of natural impurities, chemical fibers or a mixture thereof, and a
deposited layer obtained by depositing metal or metal compound on the surface of the substrate
by vacuum deposition method, sputtering method or the like. It is characterized by consisting of.
In the following, an embodiment of the present invention will be described based on the attached
drawings and the following table. FIG. 1 is a cross-sectional view of the speaker diaphragm of the
present embodiment, which shows a cone shape. As shown in the enlarged partial cross-sectional
view of FIG. 2 (a), the imaging plate 21 is covered with the deposition layer 23 of AI on the entire
surface on the sound wave emission direction side of the diaphragm substrate 22. The
manufacturing method for obtaining the speaker diaphragm of this embodiment is as follows.
First, NBKP (softwood bleached kraft valve) is beaten to a beating degree of 20 degrees 5R (JIS P8121), and this is paper-made by a predetermined cone-shaped metal mesh, heated and pressed
by a predetermined die to obtain the diaphragm substrate 22 . Here, a diaphragm substrate may
be used in which natural mM is used but mixed with chemical fiber. Chemical fibers include
inorganic fibers such as glass fibers, carbon fibers and alumina fibers, and organic fibers such as
acrylic fibers and aromatic polyamide fibers. The surface of the diaphragm substrate is
preferably sealed by coating and immersion of a resin solution such as methacrylic resin in order
to obtain a uniform vapor deposition layer in the next vapor deposition step. Next, A1 is vapordeposited on the sound wave emitting surface side of the diaphragm base 22 by the apparatus
shown in the schematic cross sectional views of FIG. 3 and FIG. 4 to form the vapor deposition
layer 23. FIG. 3 is a schematic cross-sectional view of the vacuum chamber 25. The formed base
22 is fixed to the inside by a suitable jig, and the deposition source 26 of metal, metal compound
or alloy is disposed to face the surface on which deposition of the base is to be applied. Further,
the heater 27 is disposed in the vicinity of the steam B source. Metals for vapor deposition
include AI, W, Ta, Mo. ?????????????????????? Au, Ti, Si, etc. are al.
When depositing these, two or more deposition sources 26 can be prepared, and these metals
can be deposited on the surface of the substrate in the form of their alloys by depositing these
metals. In addition, by sealing the gas inside the vacuum chamber 25, vapor deposition in the
form of various compounds can also be performed.
For example, when O: gas (10 -4 to 10 -5 orr) T: A1 is evaporated, it can be vapor deposited in
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the form of A I 203. Similarly, SiC in the case of Si in C2H2 gas. In the case of A1 in NH3 gas, AIN
can be deposited. In this example, vapor deposition of A1 was performed. The vacuum pressure
cover 10 'Torr was used, and A1 was heated and evaporated at 400 to 500 ░ C. Here, since
temperature measurement in vacuum is difficult, in the present embodiment, calculation is made
from the heater 8 group, current and voltage. The film thickness of the A1 vapor deposition layer
is calculated on the basis of the increase in base weight setting by vapor deposition in the
present embodiment because the surface of the substrate made of wood bulbs has unevenness
and is difficult to measure. The increase in mold opening due to the deposited layer was 5 to
10%. Although vacuum evaporation is used here, WSsm can also be formed by sputtering. Thus,
the diaphragm 21 of the present embodiment is obtained. Finally, in order to protect the AI vapor
deposition layer 23, a methacrylic resin may be applied to the surface of the vapor deposition
layer 23 as shown in FIG. 2 (b) and a protective film 24 may be provided. FIG. 4 is a schematic
cross-sectional view of the vacuum deposition apparatus used in the present invention. The
vacuum tank 25 and the pump are closed with the valve 28 for shutting off the atmosphere, and
the valve 31 is opened to evacuate the vacuum tank 25 with the low vacuum pump 3 o. The low
vacuum pump 30 is, for example, an oil rotary pump or a sorption pump. A low vacuum gauge
36 is provided in the piping. When the vacuum pressure is 760 Torr and 1 Torr by the oil rotary
pump, the valve 3.1 is closed, the valves 32 and 33 are opened, and the high vacuum pump 34 is
used to further suck. A high vacuum gauge 35 and a liquid nitrogen trap 37 are provided in the
piping. For example, an oil diffusion pump or a sputter ion pump can be used as the high vacuum
pump 34. The vacuum pressure is set to 10-2 Torr to 10 "Torr by these devices. Instead of the oil
rotary pump, the absorption pump can suction up to 10-4 Torr. In the following table, physical
properties before and after vapor deposition treatment are shown in the table when
manufacturing a diaphragm for a full range speaker having a diameter of 16 cm according to this
example. It can be seen that the present example obtained after the vapor deposition process
improves the internal loss with almost no change in Young's modulus compared to the substrate
before the vapor deposition process. FIG. 7 is a graph of the sound pressure frequency
characteristics of both, but in the present embodiment (broken line A), the dip in the middle low
region of the frequency characteristics is improved compared to the diaphragm substrate (solid
line B) because the internal loss is improved. It is understood that it is suppressed.
Further, in the present embodiment, the metallic gloss is given to the appearance. Furthermore,
the deposited layer prevents light from entering the interior of the substrate. As an application
example of the present invention, partial deposition can also be performed by, for example,
masking the surface of the diaphragm substrate 22 with a mask 40 in the deposition step shown
in FIG. That is, as shown in FIG. 5, it is possible to form lead wires 23 'of the voice coil directly on
the diaphragm base 22 by vapor deposition utilizing the conductivity of metal. Also, as shown in
FIG. 6, it is possible to partially vapor-deposit a character or picture 23 ? ? by a metaldeposition layer. As described above, according to the present invention, since the metal lid Will
is formed on the surface of the substrate mainly made of wood valve, the diaphragm having the
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desired characteristics can be easily maintained easily as in the prior art. And a diaphragm
having a metallic luster on its surface is obtained. In addition, a loudspeaker diaphragm having
light resistance can be obtained while maintaining physical property values such as rigidity and
internal loss.
[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view of a speaker diaphragm according to the present invention, FIG. 2 is an
enlarged partial cross-sectional view of circle A in FIG. 1, FIG. 3 is a schematic cross-sectional
view of a vacuum tank, and FIG. FIG. 5 is a schematic cross-sectional view of a vacuum deposition
apparatus, FIG. 5 and FIG. 6 are front views of a speaker diaphragm showing an application
example of the present invention, and FIG. FIG. 8 is a cross-sectional view of a conventional
electrodynamic speaker, showing a graph of sound pressure frequency characteristics when
assembled.
Explanation of the sign of the main part 21 иииииииии Cone-shaped diaphragm 22 ииииииии Diaphragm
base 23 иииииии Steaming @ layer
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