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JP2010087925

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DESCRIPTION JP2010087925
PROBLEM TO BE SOLVED: To provide a speaker member having high durability, in which a
member for a speaker is reformed so as to have excellent wettability and rigidity, and the
obtained modification effect is high. SOLUTION: The speaker member of the present invention is
provided by a speaker member formed by irradiating a thermoplastic resin with gamma rays. 【
Selection chart】 None
Speaker member and method of manufacturing the same
[0001]
The present invention relates to a speaker member and a method of manufacturing the same, and
provides a speaker member having excellent wettability and rigidity.
[0002]
Representative thermoplastic resins used for members for speakers include olefin resins having
excellent internal loss.
However, olefin resins have low surface energy and poor wettability, which causes problems in
adhesion strength between members. As conventional methods, there are surface treatment
methods such as primer application, plasma discharge, visible light and ultraviolet irradiation as
methods of solving the problem of wettability.
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1
[0003]
Japanese Patent Application Laid-Open No. 11-355895 discloses a method of manufacturing a
speaker diaphragm in which a speaker diaphragm is subjected to plasma treatment to activate
the surface, and then primer coating is performed to modify adhesion. Further, Japanese Patent
Application Laid-Open No. 2001-258091 discloses a method of manufacturing a diaphragm for a
speaker, in which a visible light laser is caused to act on a diaphragm for a speaker to modify a
surface portion of the diaphragm.
[0004]
Each of these conventional methods is a processing method of modifying only the surface of the
member to be used. The plasma discharge treatment brings the surface of the member close to
the surface where the plasma flame is generated, but the effect does not extend to the inside of
the member. Similarly, in the visible light laser, the light energy is small and the transmission
power is weak due to the long wavelength, so that the modification effect of the member does
not extend to the inside of the member. Furthermore, the effect imparted to the member by these
methods has the problem that the effect is not sustained because the energy received by the
member is small.
[0005]
JP-A-11-355895 JP-A-2001-258091
[0006]
The present invention has been made to solve the above-mentioned problems of the prior art,
and its object is to modify the speaker member so as to have excellent wettability and stiffness,
and to obtain the modified product. An object of the present invention is to provide a speaker
member having high durability and high durability.
[0007]
The speaker member of the present invention is provided by a speaker member formed by
irradiating a thermoplastic resin with gamma rays.
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[0008]
Preferably, the speaker member of the present invention is a thermal selected from polyethylene
terephthalate (PET) resin, polypropylene (PP) resin, polyetherimide (PEI) resin, polycarbonate
(PC) resin, and polyarylate (PAR) resin. It is a member for speakers consisting of plastic resin.
[0009]
In addition, preferably, the member for speakers of the present invention is a member for
speakers in which the thermoplastic resin is a film sheet, and the film sheet is formed.
[0010]
Furthermore, preferably, the speaker member of the present invention is a speaker member
having a total dose of gamma rays irradiated to the thermoplastic resin of 20 kGy to 400 kGy.
[0011]
The method for manufacturing a speaker member according to the present invention includes
the steps of irradiating a thermoplastic resin composition with gamma rays, and forming the
gamma ray irradiated thermoplastic resin composition into a speaker member. It is a method.
[0012]
The method for manufacturing a speaker member according to the present invention is a method
for manufacturing a speaker member, including the steps of forming a thermoplastic resin
composition into a speaker member and irradiating the molded member with a gamma ray.
[0013]
Also preferably, the method of manufacturing a speaker member according to the present
invention is a method of manufacturing a speaker member, further including selecting cobalt 60
as the gamma ray source.
[0014]
Hereinafter, the operation of the present invention will be described.
[0015]
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The member for a speaker of the present invention is obtained by irradiating a thermoplastic
resin to be used with gamma rays.
Gamma rays are short in wavelength and have high energy and strong transparency.
When the thermoplastic resin is irradiated with gamma rays, the gamma rays pass through the
thermoplastic resin composition to excite the polymer molecules of the thermoplastic resin
composition.
When the polymer molecule is excited, cleavage of the main chain and detachment of the side
chain occur to convert the polymer structure.
Cleavage of the polymer main chain generates polymer radicals.
After the formation of polymer radicals, a crosslinking reaction in which the polymer radicals
recombine with each other and an oxidation reaction in which the polymer radicals bond with
oxygen proceed in a competitive manner.
The competitive reaction between the crosslinking reaction and the oxidation reaction depends
on steric structural factors of the thermoplastic resin composition.
[0016]
After irradiating gamma rays to a thermoplastic resin having poor wettability, for example, an
olefin resin to generate polymer radicals, if an oxidation reaction proceeds predominantly, the
olefin resin after irradiation has an active functional group on the surface. The surface is
activated.
Therefore, the surface energy is increased, and the so-called wettability is improved and the
surface resin is reformed into a thermoplastic resin having excellent adhesiveness.
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[0017]
When the speaker member to which gamma rays are irradiated is a diaphragm, the diaphragm to
which the gamma rays are irradiated is improved in wettability and has excellent adhesion.
Therefore, the diaphragm and the voice coil bobbin connected to the diaphragm And are firmly
fixed.
Therefore, the driving force from the vibration system can be transmitted to the diaphragm
without loss.
[0018]
The method for manufacturing a speaker member according to the present invention can
irradiate gamma rays to the thermoplastic resin before molding into the speaker member, while
irradiating the gamma resin onto the thermoplastic resin after molding the speaker member It is
also possible.
Since gamma rays have strong penetrating power, gamma rays may be radiated regardless of the
shape of the thermoplastic resin or the member for a speaker that emits gamma rays.
Therefore, even if the thermoplastic resin is in the form of a film, gamma rays can be irradiated
even if the film is wound in a roll. In addition, even after the thermoplastic resin is molded into
the speaker member, gamma rays can be irradiated. Furthermore, in the process of irradiating
gamma rays, since a large number of speaker members can be processed per one irradiation, the
manufacturing cost is excellent in that a large number of speaker members can be procured in a
short time.
[0019]
The member for a speaker according to the present invention and the method for manufacturing
the same provide a member for a speaker excellent in wettability, rigidity and internal loss by an
easy processing method.
[0020]
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Hereinafter, embodiments of the present invention will be specifically described, but these are
merely examples for carrying out the present invention.
Therefore, the present invention is not limited to the embodiments to be described later, and the
embodiments can be appropriately modified and implemented without departing from the scope
of the invention.
[0021]
The speaker member of this embodiment is a speaker frame 1.
[0022]
A speaker frame 1 was obtained by injection molding a composition consisting of a
polypropylene resin and 20 wt% of glass fiber.
The aperture of the speaker frame is 16 cm. The speaker frame 1 was enclosed in an aluminum
container and installed in a gamma ray irradiation apparatus. The total dose of gamma rays
irradiated to the speaker frame 1 was adjusted to 20 kGy.
[0023]
The wetting index of speaker frame 1 was measured to compare the wetting index before and
after gamma irradiation. The measuring method was performed based on the wetting index test
(JIS-K6768). The number of measurements is eight listed below: unirradiated (A), immediately
after irradiation (B), two days after irradiation (C), four days after irradiation (D), one week after
irradiation (E), two weeks after irradiation (F), 3 weeks after irradiation (G), 4 weeks after
irradiation (H). The measurement results are shown in Table 1 below together with the results of
Examples 2 to 3 and Comparative Examples 1 to 2 described later.
[0024]
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[0025]
The speaker frame 2 was obtained in the same manner as in Example 1 except that the total dose
of gamma rays to be irradiated was adjusted to 100 kGy.
The obtained speaker frame 2 was subjected to the same evaluation as in Example 1. The results
are shown in Table 1 above.
[0026]
The speaker frame 3 was obtained in the same manner as in Example 1 except that the total dose
of gamma rays to be irradiated was adjusted to 200 kGy. The obtained speaker frame 3 was
subjected to the same evaluation as in Example 1. The results are shown in Table 1 above.
[0027]
Comparative Example 1 A speaker frame 10 was obtained by injection molding using a
thermoplastic resin having the same composition as in Example 1. The obtained speaker frame
10 was installed in an irradiation device (manufactured by Sen Special Light Source: EUV 200 W)
equipped with an ultraviolet low pressure mercury lamp. The conditions for irradiating
ultraviolet light were a peak wavelength of 185 nm, an irradiation distance of 10 mm from the
ultraviolet low pressure mercury lamp to the speaker frame 10, and an irradiation time of 3
minutes. The speaker frame 10 irradiated with ultraviolet light was subjected to the same
evaluation as in Example 1. The results are shown in Table 1 above.
[0028]
Comparative Example 2 A speaker frame 20 was obtained by injection molding using a
thermoplastic resin having the same composition as in Example 1. The obtained speaker frame
20 was subjected to plasma discharge treatment using an atmospheric pressure plasma
generator (manufactured by Kasuga Denki Co., Ltd .: PS-601C). The plasma discharge treatment
was performed for 3 minutes while maintaining the distance between the plasma generation
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surface in the atmosphere and the speaker frame 20 to be 20 to 40 mm. The speaker frame 20
subjected to plasma discharge treatment was subjected to the same evaluation as in Example 1.
The results are shown in Table 1 above.
[0029]
As apparent from the results of Table 1, the speaker frame obtained by the present invention has
a smaller wettability deterioration with time, as the total dose of the gamma ray irradiated is
larger. As a result of any of the examples, the wetting index showed a value of 40 or more even
after 4 weeks of irradiation with gamma rays. On the other hand, the speaker frames 10 and 20
which do not irradiate the gamma ray of Comparative Examples 1 and 2 have large timedependent deterioration of wettability. The speaker frame 10 obtained by the irradiation of
ultraviolet light deteriorates to the same level as the untreated state after 4 days of the
irradiation treatment, and the speaker frame 20 subjected to the plasma discharge treatment is
the untreated state after 2 weeks of the discharge treatment Deteriorated to the same level.
[0030]
The speaker member obtained according to the embodiment of the present invention has better
wettability than the speaker member obtained by the conventional processing method, and the
durability of the modification effect is high. If the effect given to the speaker member is highly
durable, the member can be stored for a certain period of time, and the speaker member does not
need to be quickly assembled to the speaker device, so that the manufacturing efficiency of the
speaker device is excellent.
[0031]
Another aspect of this embodiment is excellent in that the processing method of irradiating
gamma rays is easy. In the method of irradiating ultraviolet light and the method using plasma
discharge, the light source or the surface to be treated must be brought close to the surface to be
treated. In addition, if the member to be processed has a three-dimensional shape, it is difficult to
uniformly give the member a processing effect. However, according to the embodiment of the
present invention, since gamma rays have a strong transmission power, even if the member that
emits gamma rays has a certain distance from the radiation source, the shape of the member to
which gamma rays are irradiated has any shape. Even if it has, a uniform effect is acquired.
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[0032]
The speaker member of this embodiment is a speaker diaphragm 4.
[0033]
After irradiating a film-like sheet of polyetherimide (PEI) resin having a thickness of 40 μm with
gamma rays, the PEI sheet was thermoformed to obtain a diaphragm 4 for a speaker.
The total dose of gamma rays irradiated to the PEI sheet was adjusted to 100 kGy. The Young's
modulus and internal loss of the obtained speaker diaphragm 4 are measured by a conventional
method, and the contact angle of the diaphragm surface is measured using a FACE contact angle
meter (manufactured by Kyowa Interface Chemicals Co., Ltd .: CA-D). It measured using. The
measurement results are shown in Table 2 below together with Examples 5 to 6 and Comparative
Example 3 described later.
[0034]
[0035]
A speaker diaphragm 5 was obtained in the same manner as in Example 4 except that the total
dose of gamma rays to be irradiated was adjusted to 200 kGy.
The obtained speaker diaphragm 5 was subjected to the same evaluation as in Example 4. The
results are shown in Table 2 above.
[0036]
A speaker diaphragm 6 was obtained in the same manner as in Example 4 except that the total
dose of gamma rays to be irradiated was adjusted to 400 kGy. The obtained speaker diaphragm 6
was subjected to the same evaluation as in Example 4. The results are shown in Table 2 above.
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[0037]
Comparative Example 3 A diaphragm for a speaker 30 was obtained by thermoforming a PEI
sheet not irradiated with gamma rays, without irradiating the film-like sheet of polyetherimide
(PEI) resin having a thickness of 40 μm with gamma rays. . The obtained speaker diaphragm 40
was subjected to the same evaluation as in Example 4. The results are shown in Table 2 above.
[0038]
As apparent from Table 2, the contact angle improved significantly as the gamma ray irradiation
dose increased. In addition, the speaker diaphragms 4 to 6 obtained in Examples 4 to 6 have
superior Young's modulus and internal loss compared to the speaker diaphragm 30 of
Comparative Example 3. That is, by improving the Young's modulus and the internal loss, the
speaker diaphragms 4 to 6 are members for a speaker that are excellent in wettability and
rigidity.
[0039]
A graph comparing the sound pressure-frequency characteristics of the speaker diaphragms 4 to
6 obtained in the fourth to sixth embodiments with the speaker diaphragm 30 obtained in the
comparative example 3 is shown in FIG. The speaker diaphragms 4 to 6 obtained by the present
embodiment maintain the sound pressure level of the speaker diaphragm 30 obtained by the
comparative example 3 not irradiated with gamma rays, and show excellent sound pressurefrequency characteristics. There is.
[0040]
A diaphragm for a speaker 7 was obtained in the same manner as in Example 4 except that a
film-like sheet of polycarbonate (PC) resin having a thickness of 40 μm was irradiated with
gamma rays. The total dose of gamma rays irradiated to the PC sheet was adjusted to 100 kGy.
The obtained speaker diaphragm 7 was subjected to the same evaluation as in Example 4. The
results are shown in Table 3 below together with Examples 8 to 9 and Comparative Example 4
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described later.
[0041]
[0042]
A speaker diaphragm 8 was obtained in the same manner as in Example 7 except that the total
dose of gamma rays to be irradiated was adjusted to 200 kGy.
The obtained speaker diaphragm 8 was subjected to the same evaluation as in Example 4. The
results are shown in Table 3 above.
[0043]
A speaker diaphragm 9 was obtained in the same manner as in Example 7 except that the total
dose of gamma rays to be irradiated was adjusted to 400 kGy. The obtained speaker diaphragm 9
was subjected to the same evaluation as in Example 4. The results are shown in Table 3 above.
[0044]
Comparative Example 4 A gamma ray-unirradiated PC sheet was thermoformed to give a
diaphragm 40 for a speaker, without irradiating the film-like sheet of polycarbonate (PC) resin
having a thickness of 40 μm with gamma rays. The obtained speaker diaphragm 40 was
subjected to the same evaluation as in Example 4. The results are shown in Table 3 above.
[0045]
As apparent from Table 3, the contact angle improved significantly as the gamma ray irradiation
dose increased. In addition, the speaker diaphragms 7 to 9 obtained in Examples 7 to 9 have
superior Young's modulus and internal loss as compared with the speaker diaphragm 40 of
Comparative Example 4. That is, by improving the Young's modulus and the internal loss, the
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speaker diaphragms 7 to 9 are members for a speaker that are excellent in wettability and
rigidity.
[0046]
A graph comparing the sound pressure-frequency characteristics of the speaker diaphragms 7 to
9 obtained in the seventh to ninth embodiments with the speaker diaphragm 40 obtained in the
comparative example 3 is shown in FIG. The speaker diaphragms 7 to 9 obtained by the present
embodiment maintain the sound pressure level of the speaker diaphragm 40 obtained by the
comparative example 4 not irradiated with gamma rays, and show excellent sound pressurefrequency characteristics. There is.
[0047]
A speaker diaphragm 10 was obtained in the same manner as in Example 4 except that the filmlike sheet of polyarylate (PAR) resin having a thickness of 40 μm was irradiated with gamma
rays. In addition, it adjusted so that the total dose of the gamma ray irradiated to PAR sheet
might be 100 kGy. The obtained speaker diaphragm 10 was subjected to the same evaluation as
in Example 4. The results are shown in Table 4 below together with Examples 11 to 12 and
Comparative Example 5 described later.
[0048]
[0049]
A speaker diaphragm 11 was obtained in the same manner as in Example 10 except that the total
dose of gamma rays to be irradiated was adjusted to 200 kGy.
The obtained speaker diaphragm 11 was subjected to the same evaluation as in Example 4. The
results are shown in Table 4 above.
[0050]
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A speaker diaphragm 11 was obtained in the same manner as in Example 10 except that the total
dose of gamma rays to be irradiated was adjusted to 400 kGy. The obtained speaker diaphragm
11 was subjected to the same evaluation as in Example 4. The results are shown in Table 4
above.
[0051]
Comparative Example 5 A PAR sheet not irradiated with gamma rays was thermoformed to give a
diaphragm 50 for a speaker, without irradiating the film-like sheet of polyarylate (PAR) resin
having a thickness of 40 μm with gamma rays. The obtained speaker diaphragm 50 was
subjected to the same evaluation as in Example 4. The results are shown in Table 4 above.
[0052]
As apparent from Table 4, the contact angle improved significantly as the gamma ray irradiation
dose increased. In addition, the speaker diaphragms 10 to 12 obtained in Examples 10 to 12
have superior Young's modulus and internal loss compared to the speaker diaphragm 50 of
Comparative Example 5. That is, by improving the Young's modulus and the internal loss, the
speaker diaphragms 10 to 12 are members for a speaker that are excellent in wettability and
rigidity.
[0053]
A graph comparing the sound pressure-frequency characteristics of the speaker diaphragms 10
to 12 obtained by the present Examples 10 to 12 with the speaker diaphragm 60 obtained by the
comparative example 5 is shown in FIG. 3. The speaker diaphragms 10 to 12 obtained according
to this embodiment maintain the sound pressure level of the speaker diaphragm 50 not
irradiated with the gamma ray obtained according to Comparative Example 5, and show excellent
sound pressure-frequency characteristics. There is. In particular, the sound pressure in the low
frequency band of 1 kHz or less is superior to that of the speaker diaphragm 50 of Comparative
Example 5.
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[0054]
The present invention is not limited to the speaker frame and the speaker diaphragm, but can be
applied to other speaker members made of thermoplastic resin, for example, a speaker damper.
[0055]
It is a figure which shows the frequency characteristic of the speaker diaphragms 4 to 6 obtained
by this invention, and the speaker diaphragm 40 of a comparative example.
It is a figure which shows the frequency characteristic of the speaker diaphragms 7-9 obtained
by this invention, and the speaker diaphragm 50 of a comparative example. It is a figure which
shows the frequency characteristic of the speaker diaphragms 10-12 obtained by this invention,
and the speaker diaphragm 60 of a comparative example.
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