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JPH09163488

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH09163488
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm for a speaker.
[0002]
2. Description of the Related Art An electrodynamic speaker as shown in FIG. 9 has been known
conventionally. In such a speaker, an annular magnet 103 and an annular plate 104 have a
cylindrical pole piece 102 attached to the central portion of a disk-shaped back plate 101 and
coaxially attached to the peripheral portion of the disc-shaped back plate 101. To form a
magnetic circuit provided with a magnetic gap consisting of ring-shaped openings of a
predetermined width. In such a speaker, the diaphragm 108, the center cap 109 and the voice
coil bobbin 106 are vibrators, and in the electrodynamic speaker, they are portions for
converting an input signal to the voice coil 105 into an acoustic output. In order to faithfully
convert the driving force generated by the input signal of the voice coil 105, these vibrators
perform an ideal piston motion together within the reproduction frequency band, and an
unnecessary peak is generated. It is necessary to have a smooth reproduction sound pressure
frequency characteristic without any occurrence. This means that it is necessary to set the
respective material properties so as to have adequate internal loss at the same time as the conical
diaphragm provided for generating the acoustic output, and the center cap, of the vibrating parts,
in particular, have rigidity. There is.
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[0003]
A voice coil bobbin 106 for fixing a voice coil 105 formed by winding an electric wire of a
predetermined length in this magnetic gap is supported by a damper 107 so as to be freely
slidable in the axial direction of the pole piece 102. It is done. Further, a cone-shaped diaphragm
108 is coupled to the voice coil bobbin 106 at a central portion thereof, and a center cap 109 is
crowned at an end portion thereof. The outer peripheral edge of the cone-shaped diaphragm 108
is supported by a frame 111 fixed to the plate 104 via an edge 110. The outer peripheral end of
the edge 110 is fixed to the frame 111 by a gasket 112. The lead wires 105a forming the coil
end portions of the voice coil 105 are respectively connected to a pair of tinsel wires 113 made
of a conductive material and connected to terminals 114 provided on the side surfaces of the
frame 111.
[0004]
In recent years, the application of such a loudspeaker has been greatly expanded, and a
loudspeaker diaphragm having an excellent appearance in terms of design while strongly
satisfying the above-described material properties of the diaphragm is strongly demanded from
the market. Further, in the case of a vehicle-mounted speaker, particularly when mounted as a
door, it is strongly desired that the portion in contact with the outside air, in particular the
diaphragm, be waterproof, from the viewpoint of reliability and performance maintenance.
[0005]
Under such circumstances, plastic diaphragms, particularly polypropylene diaphragms, have
begun to be used in many cases for the cone-shaped diaphragm and the center cap due to their
sound quality and f characteristics. Polypropylene (hereinafter referred to as PP). The diaphragm
of the above has well-balanced properties required as a diaphragm and also has waterproofness,
but due to its nature, it is not without problems in the manufacturing process. That is, since there
is no polarity in the molecular structure of PP, there is a problem in adhesion. In order to
compensate for this, pretreatment such as primer treatment is generally performed, and in rare
cases corona discharge treatment or the like is performed to improve the surface adhesiveness.
For this reason, when bonding the diaphragm to a voice coil or center cap formed of plastic,
paper, glass fiber, metal or the like, pretreatment such as primer treatment is required, and
therefore, the number of assembling steps is increased. There is a problem that mass productivity
is bad and cost increases. Furthermore, since the diaphragm is formed by injection molding or
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heat and pressure molding of plastic or the like, the appearance design is restricted, and it has
been difficult to form various appearances.
[0006]
SUMMARY OF THE INVENTION The present invention has been made in view of the above
problems, and has waterproofness, and can improve physical properties such as rigidity and
internal loss as a speaker, and further, an assembly process It is an object of the present
invention to provide a speaker diaphragm having reliability in the above adhesive strength and
capable of being formed with an appearance having various characters, patterns and the like.
[0007]
According to the first aspect of the present invention, there is provided a diaphragm for a
speaker comprising a polypropylene-based substrate, wherein the metal or metal compound is
deposited on part or all of the substrate surface. It is characterized in that
According to the second aspect of the present invention, the surface of the vapor-deposited layer
of metal or metal compound is provided on a part or all of the surface of a substrate formed of a
plastic material mainly composed of polypropylene. Since the resin layer is further provided so as
to cover, the vapor deposition layer is difficult to peel off, and further, it can be formed with an
appearance having various characters, patterns and the like on the substrate.
[0008]
According to a second aspect of the present invention, in the speaker diaphragm of the first
aspect, a resin layer is further provided on at least the surface of the vapor deposition layer.
[0009]
Since the present invention is configured as described above, according to the first aspect of the
present invention, the speaker diaphragm is formed of a plastic material mainly made of
polypropylene with a base, and a part or all of the surface of the base is produced. Since the
metal or metal compound is vapor-deposited to form a vapor deposition layer, various characters,
patterns, etc. are expressed with the metal or metal compound on the diaphragm composed of a
cone-shaped diaphragm or center cap. it can.
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Next, a Ni-Cr alloy is vapor-deposited on the sound wave emitting surface side of the diaphragm
substrate 2 by the vapor deposition apparatus shown in the schematic cross sectional views of
FIG. 2 and FIG. 3 to form a vapor deposition layer 3. The deposition layer 3 is actually deposited
not only on the sound wave emitting surface side but also on the back surface. In this manner, by
forming the vapor deposition layer 3 in advance in the portion where the diaphragm substrate 2
and the voice coil bobbin are adhered, the pretreatment such as the primer treatment is omitted
in the adhesion step. Furthermore, the adhesion strength does not decrease even if the
conventional primer treatment is added.
[0010]
In addition, since the diaphragm is a multilayer formed of the base and the vapor deposition
layer, the rigidity of the diaphragm comprising the cone-shaped diaphragm and the center cap
can be enhanced and the internal loss can be increased. Performance can be improved. FIG. 2 is a
schematic cross-sectional view of a vacuum chamber used to form a vapor deposition layer of a
speaker diaphragm according to an embodiment of the present invention. A deposition source
comprising the diaphragm substrate 2 fixed in the vacuum chamber 4 by a suitable jig (not
shown) and directed to the surface of the diaphragm substrate 2 on which vapor deposition is
mainly intended to be performed. Arrange 5 Further, a heater 6 for heating is disposed in the
vicinity of the vapor deposition source 5.
[0011]
Further, since the diaphragm is formed of the waterproof base and the vapor deposition layer,
the waterproof property can be maintained, and therefore, the diaphragm can be used for a
speaker for outdoor or car use.
[0012]
In addition, since a cone-shaped diaphragm, a center cap and the like can be easily and reliably
adhered to the voice coil bobbin, the assembly of the speaker is facilitated, the number of
assembling steps can be significantly reduced, and the mass productivity is improved.
Further, by enclosing a gas inside the vacuum chamber 4, vapor deposition in the form of various
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compounds can also be performed. For example, when Al is evaporated in O2 gas (10E-4 to 10E5 Torr), a vapor-deposited layer made of Al2O3 can be formed on the surface of the diaphragm
substrate 2. Similarly, in the case of Si in C2 H2 gas, an evaporation layer made of SiC is formed,
and in the case of Al in NH3 gas, a vapor deposition layer made of AlN is formed.
[0013]
DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will
be described below with reference to FIGS. FIG. 1 is a schematic cross-sectional view of a speaker
diaphragm in an embodiment of the present invention, and FIG. 1A shows a cross-sectional view
of a cone-shaped diaphragm 1. FIG. 1 (b) is an enlarged view of an arrow A showing a crosssectional view of the diaphragm 1 shown in FIG. 1 (a). As shown in FIG. 1 (b), the diaphragm 1 is
a diaphragm base The vapor deposition layer 3 which consists of nickel-chromium alloys is
laminated | stacked on the whole surface of the sound emission surface side of 2, and is
comprised. Next, the valve 8 is opened to guide the air remaining in the space in the vacuum
chamber 4 to the low vacuum pump 9 for removal. As the low vacuum pump 9, for example, an
oil rotary pump or a sorption pump is used. A low vacuum gauge 15 is provided in the middle of
the piping of the vacuum tank 4 and the low vacuum pump 9 and suctioned by the low vacuum
pump 9. When the vacuum pressure becomes, for example, 760 Torr to 1 Torr, the valve 8 is
closed and closed. The valve 10 and the valve 11 are opened and the high vacuum pump 12
further sucks. As shown in the figure, a high vacuum gauge 13 and a liquid nitrogen trap 14 are
provided in the middle of the piping of the high vacuum pump 12. As the high vacuum pump 12,
for example, an oil diffusion pump or a sputter ion pump is used.
[0014]
Here, a method of manufacturing the speaker diaphragm in the present embodiment will be
described below.
[0015]
First, a PP pellet containing 3% mica and 7% carbon fiber is formed into a diaphragm base 2
made of a cone body having a predetermined diameter by an injection machine.
Table 1 below shows physical property values before and after the vapor deposition treatment in
forming the diaphragm for a full range speaker of 16 cm according to this example.
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[0016]
As the evaporation source 5, for example, metals or metal compounds such as Al, W, Tu, Mo, Nb,
Pt, Ni, Cr, SiO, Zr, Ti, Si, and the like, and alloys of these, etc. can be used. In addition, two or more
of these metals or metal compounds or alloys may be simultaneously used as the deposition
source 5, and in that case, these alloys can be deposited on the surface of the diaphragm
substrate 2 as their alloys. The deposited layer formed of these alloys can be easily bonded to the
voice coil bobbin without any pretreatment such as primer treatment.
[0017]
In this example, Ni-Cr was used as a deposition source, the vacuum pressure in the vacuum
chamber was 10E-4 Torr, and Ni-Cr was heated and evaporated at about 400-500.degree. Here,
since temperature measurement in vacuum is difficult, calculation is made from the heater
capacity, current and voltage in this embodiment. About the film thickness of a Ni-Cr vapor
deposition layer, a slide glass is put in the same tank, this is measured, and it sets to about 1-2
micrometers.
[0018]
FIG. 3 is a cross-sectional view of a vacuum vapor deposition apparatus used to form a vapor
deposition layer of a speaker diaphragm according to an embodiment of the present invention,
which is formed using the vacuum chamber of FIG. A desired vacuum pressure can be obtained in
the vacuum chamber 4 at the time of deposition by the following operation. First, the valve 7
provided in the pipe connected to the vacuum chamber 4 is closed to shut off the space in the
vacuum chamber 4 from the atmosphere.
[0019]
As described above, the predetermined vacuum pressure necessary for vapor deposition can be
obtained by drawing the inside of the vacuum chamber of the vacuum vapor deposition
apparatus stepwise using the low vacuum pump and the high vacuum pump. When an oil rotary
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pump is used as the low vacuum pump 9, the obtained vacuum pressure is 10E-2 Torr to 10E-8
Torr, but when using a sorption pump instead of the oil rotary pump, suction up to 10E-4 Torr is
possible. is there.
[0020]
As described above, the vapor deposition layer can be formed on the diaphragm substrate using
a vacuum vapor deposition apparatus, but the method used for vapor deposition is not limited to
this, and may be formed by, for example, a sputtering method. In the above embodiments, the
deposition layer 3 and the voice coil are bonded to each other at the central portion of the
speaker diaphragm. However, the deposition layer 3 edge is bonded to the periphery of the
diaphragm. The same applies to the above, and it is not necessary to perform primer treatment in
advance on the portion of the vapor deposition layer to be bonded with the edge formed using
cloth, foamed urethane resin, plastic resin or the like.
[0021]
As can be seen from Table 1, the diaphragm for a speaker according to the present embodiment
obtained after the vapor deposition treatment forms a multilayer diaphragm by providing a vapor
deposition layer as compared with the diaphragm substrate before the vapor deposition
treatment. It can be seen that the Young's modulus is increased and the internal loss is improved.
[0022]
FIG. 4 is a graph of the sound pressure frequency characteristics of a speaker prepared using the
two diaphragms under the same conditions as in the other embodiment. As can be seen from the
figure, the present embodiment (broken line B) Since the internal loss is improved, it can be seen
that the dip in the middle low region of the frequency characteristic is suppressed as compared
with the example of the speaker (solid line C) with the diaphragm made of the diaphragm base
without the deposition layer.
[0023]
Since the speaker diaphragm in one embodiment of the present invention is made and configured
by the above method, when the speaker is prepared, the central portion of the diaphragm to
which the voice coil bobbin is attached and attached is pre-primed. Since it is not necessary to
apply, and it can be surely adhered, the assembly of the speaker becomes easy.
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[0024]
In the present embodiment, the Ni-Cr alloy is vapor-deposited on the entire surface of the sound
wave emitting surface of the diaphragm substrate 2 to form the vapor deposition layer 3.
However, the diaphragm substrate is appropriately masked. Can be partially deposited, for
example, as shown in the speaker diaphragm in the other embodiment of the present invention
shown in FIG. Etc. can also be expressed visually.
[0025]
Further, since the appearance of the vapor deposition layer 3 becomes metallic gloss, the
diaphragm of the speaker constituted by the appearance of a single color is expressed in various
appearances by being selected in a limited manner in view of physical properties. It can be
formed.
In addition, since the diaphragm base 2 and the vapor deposition layer 3 have waterproof
property, the waterproof property can be maintained, and therefore, the diaphragm base 2 and
the vapor deposition layer 3 can be used for an outdoor or vehicle-mounted speaker.
[0026]
FIG. 6 is a schematic cross-sectional view of a speaker diaphragm according to another
embodiment of the present invention, wherein a methacrylic resin or urethane resin is further
applied to the surface of the vapor deposition layer 3 in FIG. 1 (b). To form a thin film 16.
Therefore, since the film 16 is waterproof and has good adhesion to the voice coil bobbin, even
when it is formed on the central portion of the diaphragm to which the voice coil bobbin is
attached and attached when forming the speaker, Since it is not necessary to apply primer
treatment on the film 16 and adhesion can be made reliably, assembly of the speaker becomes
easy.
[0027]
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Further, since the film 16 is formed to cover the vapor deposition layer 3, the vapor deposition
layer 3 of the speaker is the diaphragm substrate 2 due to the vibration of the diaphragm during
the sound wave emission, the friction or the shock from the outside. Can be prevented from
peeling off.
Therefore, even if the vapor deposition layer 3 having a minute area is laminated on the
diaphragm substrate 2, it is difficult to peel off, and further, it can be formed with an appearance
having various characters, patterns, etc. on the substrate.
[0028]
As another embodiment of the present invention, for example, a conductive metal or metal
compound or alloy is used as a vapor deposition source, and as shown in FIG. Can be formed as a
lead wire for drawing out the voice coil, and the number of steps for drawing out and bonding
the voice coil lead wire onto the diaphragm becomes unnecessary, and the assembly of the
speaker becomes easy.
[0029]
Furthermore, as another embodiment of the present invention, for example, in the case where the
diaphragm substrate contains a large amount of a conductive material such as carbon fiber, a
voice coil lead can be formed by forming a deposition layer of metal oxide. It is possible to form
an insulating film of bead solder that electrically connects the wire and the tinsel wire, and at the
time of speaker assembly, the diaphragm substrate and the voice coil lead wire and the tinsel
wire are easily insulated. The number of steps can be reduced.
[0030]
Also, as shown in FIG. 8 (a) or FIG. 8 (b), the divided vibration which occurs when the diaphragm
substrate vibrates as the diaphragm of the speaker as shown in FIG. 8 (a)-(b) In order to suppress
the antinodes or nodes in the dotted line), it may be formed partially along the radial or
circumferential direction.
In this case, since the vapor deposition layer has a reinforcing structure for divided vibration, it is
possible to suppress peaks and dips in reproduced sound pressure frequency characteristics
caused by the divided vibration.
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In addition, the deposition layer is not limited to the shape along the radial direction or the
circumferential direction, and may be formed by various pattern shapes synthesized by various
straight or curvilinear shapes, and peaks of reproduced sound pressure frequency characteristics
generated by division vibration The dip may be suppressed.
[0031]
In the above embodiments, the diaphragm of the speaker forming the vapor deposition layer is
described as a cone-shaped diaphragm, but the vapor deposition layer may be formed on the
center cap, and the effect is the same. It becomes.
[0032]
Furthermore, the speaker diaphragm may have various shapes such as a dome shape, a
rectangular shape, and a flat plate shape, for example, and not limited to an electrodynamic
speaker, and various types such as an electrostatic type, a piezoelectric type, and an
electromagnetic type. Applicable to speakers.
[0033]
Since the present invention is configured as described above, according to the first aspect of the
present invention, the speaker diaphragm is formed of a plastic material mainly made of
polypropylene with a base and a portion of the surface of the base or Since the metal or metal
compound is vapor-deposited on the entire surface to form the vapor-deposited layer, various
characters or patterns of metal or metal compound are formed on the diaphragm constituted of a
cone-shaped diaphragm or center cap. It can be expressed.
[0034]
In addition, since the diaphragm is a multilayer formed of the base and the vapor deposition
layer, the rigidity of the diaphragm composed of the cone-shaped diaphragm and the center cap
can be enhanced and the internal loss can be increased. The performance as a speaker can be
improved.
In addition, since the diaphragm is formed of the waterproof base and the vapor deposition layer,
the waterproof property can be maintained, and therefore, the diaphragm can be used for an
outdoor or car speaker.
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[0035]
Further, since the cone-shaped diaphragm and the center cap can be easily and surely adhered to
the voice coil bobbin, the assembly of the speaker can be facilitated, the number of assembling
steps can be significantly reduced, and the mass productivity can be improved. .
[0036]
Further, according to the second aspect of the present invention, the surface of the vapordeposited layer made of metal or metal compound is provided on a part or all of the surface of a
substrate formed using a plastic material mainly composed of polypropylene. Since the resin
layer is further provided so as to cover, the vapor deposition layer is difficult to peel off, and
further, it can be formed with an appearance having various characters, patterns and the like on
the substrate.
[0037]
Brief description of the drawings
[0038]
1 is a schematic cross-sectional view of a speaker diaphragm in an embodiment of the present
invention.
[0039]
2 is a schematic cross-sectional view of a vacuum chamber used to form a vapor deposition layer
of the speaker diaphragm in one embodiment of the present invention.
[0040]
3 is a cross-sectional view of a vacuum vapor deposition apparatus used to form a vapor
deposition layer of the speaker diaphragm in one embodiment of the present invention.
[0041]
4 is a graph of the sound pressure frequency characteristics of the speaker using the speaker
diaphragm in one embodiment of the present invention.
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[0042]
5 is a view of the speaker diaphragm in another embodiment of the present invention seen from
the sound pressure emission surface side.
[0043]
6 is a schematic cross-sectional view of a speaker diaphragm in another embodiment of the
present invention.
[0044]
7 is a view of the speaker diaphragm in another embodiment of the present invention seen from
the sound pressure emission surface side.
[0045]
8 is a view of the speaker diaphragm in another embodiment of the present invention seen from
the sound pressure emission surface side.
[0046]
9 is a schematic cross-sectional structural view of a conventional electrodynamic speaker.
[0047]
Explanation of sign
[0048]
DESCRIPTION OF SYMBOLS 1 иии Vibration plate 2 иии Vibration plate base 3 иии Vapor deposition
layer 4 иии Vacuum chamber 5 иии Vapor deposition source 6 иии Heater 7 иии ... valve 8 ----- valve 9 ---- low vacuum pump 10 ... valve 11 ... valve 12 ... high vacuum pump 13 ... high vacuum gauge 14
ииииии Liquid nitrogen trap 15 иии Low vacuum gauge 16 иии Coating 17 иии Vapor deposition layer
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