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JP2001112089

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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
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DESCRIPTION JP2001112089
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker for use in a small receiving receiver mainly used for portable telephones and the like,
and a method for manufacturing a diaphragm used for the speaker.
[0002]
2. Description of the Related Art In recent years, the development of the information
communication field business has been remarkable, and among them, the development of mobile
communication equipment has been remarkable with the mobile phone as a representative, and
the demand thereof is rising year by year. Along with this, the miniaturization of mobile
communication devices has progressed, and a receiver receiver speaker to be mounted is also
desired to be small in size and have high sound pressure and rich in low-pass feeling.
[0003]
Here, a speaker for a conventional receiving receiver will be described.
[0004]
FIG. 7 (a) is a cross-sectional view of a conventional speaker, and FIG. 7 (b) is an enlarged view of
a coupling surface of a frame and a diaphragm, which are the same as the main part.
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1
[0005]
According to the figure, reference numeral 1 denotes a diaphragm made of a film made of a resin
generating air vibration (for example, a thermosetting resin such as a thermoplastic resin such as
a polyethylene phthalate resin or a polycarbonate resin). The outer peripheral portion of is
bonded and held to the frame 3 via the adhesive 2.
[0006]
A voice coil 4 is coupled to an intermediate portion of the diaphragm 1, and the voice coil 4 is
disposed in a magnetic gap 8 of a magnetic circuit formed of a plate 5, a magnet 6, and a yoke 7
formed at a central portion of the frame 3. There is.
[0007]
Reference numeral 9 denotes a protector for protecting the diaphragm 1, and the peripheral
edge thereof is coupled to the frame 3 via the diaphragm 1 by an adhesive.
[0008]
In the speaker configured as described above, the voice coil 4 is moved in a piston by the
external driving current (voice signal) flowing to the voice coil 4, the combined diaphragm 1
vibrates, and a sound wave is emitted. is there.
[0009]
SUMMARY OF THE INVENTION However, in order to improve the sound quality of a mobile
communication device equipped with this type of speaker, it is necessary to improve the
efficiency of the speaker and to improve the low-frequency feeling of the sound quality. The
diaphragm 1 is desired to have a light weight and a shape with high compliance, that is, an
unstable shape with low rigidity.
[0010]
However, the thickness of the resin film of diaphragm 1 used for the construction of the speaker,
especially the arrangement of diaphragm 1 on frame 3 at the time of assembly, and the
workability of bonding by adhesive 2 is, for example, about 15 mm in speaker diameter If it is a
thing, about 30 microns is a limit, and big compliance was not obtained but it was a bottleneck of
sound quality improvement.
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2
[0011]
The present invention solves the above-mentioned problems, and by providing a diaphragm
having a shape with greater compliance and which does not interfere with the workability at the
time of assembling the speaker, it is possible to provide a speaker with richer low-range sound
quality. The present invention also provides a method of manufacturing a diaphragm used for the
same.
[0012]
SUMMARY OF THE INVENTION In order to solve the above problems, a loudspeaker according to
the present invention comprises a magnetic circuit, a voice coil inserted in a magnetic gap of the
magnetic circuit, and a frame coupled to the magnetic circuit. A diaphragm that is coupled to an
end face of the voice coil and is at least a peripheral edge that is adhesively coupled to the frame
and has an improved rigidity over other portions, the peripheral edge of the diaphragm being a
coupling portion with the frame The rigidity of the speaker is enhanced to facilitate the handling
at the time of assembling the speaker and the diaphragm can be made thinner, and the
diaphragm is made lightweight and highly compliant to achieve high sound pressure and lowrange sound quality speaker It is possible to offer.
[0013]
According to a first aspect of the present invention, there is provided a magnetic circuit, a voice
coil inserted in a magnetic gap of the magnetic circuit, a frame coupled to the magnetic circuit,
and the voice coil. And a diaphragm having an improved peripheral rigidity to be adhesively
bonded to at least the above-mentioned frame, the rigidity of the peripheral edge of the
diaphragm is improved, and the rigidity of the peripheral edge of the diaphragm is increased to
assemble the speaker. At the same time, it makes it possible to reduce the size of the diaphragm
while facilitating the handling of the diaphragm, and to provide a speaker excellent in the
practicality of high-sound pressure and low-range sound quality by achieving lightness and high
compliance of the diaphragm. It is
[0014]
According to a second aspect of the present invention, the rigidity of the peripheral edge is
improved over the other portions by providing fine asperities on the peripheral edge of the
diaphragm of the speaker according to the first aspect. It is possible to provide an excellent
speaker using a diaphragm which is suitable for the purpose of improving the compliance.
[0015]
The invention according to claim 3 of the present invention is characterized in that the
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diaphragm according to claim 1 or 2 is opposed to at least the upper mold or the lower mold
which has been subjected to the processing of fine irregularities on one side and the other to the
other. It is molded by sandwiching a resin film to be a diaphragm in a pressure-molding mold
provided with an elastic layer portion at a position, and substantially uniform vibration of the
thickness of the film even at the peripheral edge of the diaphragm provided with irregularities. It
is possible to provide a stable plate as a diaphragm according to claims 1 and 2.
[0016]
Hereinafter, an embodiment of a speaker according to the present invention will be described
with reference to FIGS. 1 to 6.
In the description, the same parts as in the prior art will be assigned the same reference
numerals and explanations thereof will be omitted.
[0017]
(First Embodiment) FIG. 1 is an exploded perspective view of a speaker according to an
embodiment of the present invention, FIG. 2 is a sectional view of the same speaker, and FIG. 3 is
a perspective view of a diaphragm used for the same speaker. 4 is an enlarged cross-sectional
view of the joint portion between the frame and the diaphragm which is the main part, FIG. 5 is a
cross-sectional view of the molding die of the diaphragm which is the main part, and FIG. .
[0018]
Referring to the same figure, only differences from the prior art will be described. 10 is a
diaphragm formed by molding a thin film thermoplastic resin into a dome-like curved shape, and
10a is an extremely fine provided near the periphery of this diaphragm 10. The peripheral
portion is given an uneven shape, and is bonded to the frame 3 by the adhesive 2.
Reference numeral 9 denotes a protector for preventing the exposure of the diaphragm 10,
which is bonded onto the diaphragm 10 coupled to the frame 3 with an adhesive 2.
[0019]
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The rigidity of the outer periphery of the diaphragm 10 can be enhanced by providing the
peripheral portion 10a having a fine uneven shape on the outer periphery of the diaphragm 10
as described above, and the diaphragm 10 using a thinner resin film It became possible.
[0020]
That is, conventionally, the diaphragm having a thickness of about 30 microns was the limit in
the diaphragm using a polyethylene phthalate resin film because the overall shape rigidity of the
diaphragm 10 was enhanced, but a thin film of 6 to 16 microns and a light weight It is possible
to make the diaphragm 10 possible and to greatly improve the workability and handleability at
the time of assembling the speaker, which was a problem, and to improve the high sound
pressure and the compliance by reducing the weight of the diaphragm 10. Thus, it is possible to
provide an excellent speaker capable of reproducing the bass range by suppressing the lowest
resonance frequency f0 to a low level.
[0021]
FIG. 6 shows sound pressure frequency characteristics, where a is that of a conventional speaker
and b is that of the speaker according to the present embodiment, each having a speaker outer
diameter of 16 mm and the thickness of a diaphragm using a polyethylene phthalate resin film.
The sound pressure frequency in the case of using a conventional one having a thickness of 30
microns and the one according to the present embodiment having a thickness of 15 microns
which can be used by improving the rigidity of the diaphragm 10 by providing unevenness on
the peripheral portion 10a FIG.
[0022]
As apparent from FIG. 6, it was confirmed that the lowest resonance frequency was suppressed
to be lower than about 200 to 300 Hz in the case of the present embodiment, and that high
sound pressure was achieved.
[0023]
In the above embodiment, the range of the peripheral portion 10a provided with the fine
concavo-convex shape is included not only for solving the problem of handling at the time of
assembling the speaker but also including the joint with the frame 3 through the adhesive 2.
Because of the expansion, the bonding area of the frame 3 and the peripheral portion 10a is
dramatically increased at the time of adhesive bonding with the frame 3, and the adhesion of the
adhesive 2 is good, and as a result, the bond with the frame 3 is made stronger. It is possible to
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[0024]
Next, a method of manufacturing the diaphragm, which is an essential part of the present
invention, will be described with reference to FIG.
[0025]
As shown in the figure, 15 is a diaphragm molding concave mold, 16 is a diaphragm molding
convex mold, and 17 is a rubber elastic body having a hardness of about 60 degrees of a flat
plate mounted on the diaphragm mold concave mold 15. 18 is a thermoplastic resin film material
of a diaphragm material, and a polyethylene phthalate resin film (PET film) is used in the present
embodiment.
[0026]
The forming method of the diaphragm 10 is performed by sandwiching the thermoplastic resin
film 18 between the diaphragm molding concave mold 15 and the diaphragm molding convex
mold 16 and applying pressure, and the whole diaphragm 10 is dome-shaped and the peripheral
portion 10a is flat. And, it is molded into a very fine uneven shape by the diaphragm molding
convex mold 16.
[0027]
The concave and convex portions 19 corresponding to the fine asperity shape of the peripheral
portion 10a of the diaphragm 10 on the side of the diaphragm molding convex mold 16 have a
circular or elliptical cross section with a convex and concave shape by electric discharge
machining. It is formed.
[0028]
Further, since the rubber elastic body 17 is attached to the portion corresponding to the convex
and concave portions 19, the rubber elastic body 17 is deformed according to the convex and
concave portions 19 at the time of molding to make the thickness of the peripheral portion 10a
of the diaphragm 10 substantially uniform. It is also possible to stabilize the quality of the above
and improve the reliability of the diaphragm 10.
[0029]
By appropriately selecting the hardness of the rubber elastic body 17 also depending on the
difference in the thermoplastic resin film 18 used, it is possible to suppress the variation in the
thickness of the peripheral portion 10a and to make the thickness approximately uniform.
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[0030]
Further, although a thermoplastic resin film is used as the diaphragm 10 in the above
embodiment, a thermosetting film may be used to form the diaphragm of the above embodiment
to constitute a speaker. It is obtained.
[0031]
As described above, according to the present invention, the rigidity of the peripheral edge of the
diaphragm is improved over other parts to improve the ease of handling, and the diaphragm can
be made thinner, so that the weight of the diaphragm can be reduced. -It is also possible to
provide a speaker with high sound pressure and low-range sound quality by achieving high
compliance.
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