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JPS6360699

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DESCRIPTION JPS6360699
[0001]
TECHNICAL FIELD The present invention relates to a speaker unit used in headphones and the
like. Prior Art A conventional speaker unit of this type has a structure as shown in FIG. That is,
the magnet 1 and the pole piece 2 are bonded to each other, and the frame 4 obtained by insertmolding the yoke 3 is also bonded to form a magnetic circuit. The terminal 5 is bonded to the
rear surface of the yoke 3, and the magnet 11 pole piece 2. The yoke 3 and the terminal 5 are
fixed by the eyelet 9. The diaphragm sticking ring 8 attached to the outer peripheral portion of
the frame 4 is made of brass material, the diaphragm 7 of polyethylene terephthalate film is
adhered to the diaphragm sticking ring 8, and the voice coil 6 is attached to the diaphragm 7
After bonding, the diaphragm bonding ring 8 is bonded and fixed to the frame 4, and the voice
coil 6 is connected to the terminal 5. A protector 11 made of stainless steel and a dustproof net
10 are bonded to the front of the frame 4. At this time, the imaging moving plate 7 has a
structure in which an edge portion and a central portion are formed in a dome shape by a
polymer film of polyethylene terephthalate film of the same material. The damping cloth 12 is
used for the damping of properties and is bonded to the frame 4. Fig. 5a, bI′′i, shows an
earbud headphone incorporating a conventional speaker unit. The input cord 15 is soldered to
the speaker unit 18 via the bushing 14 in the housing 13. The spiral boat 16 is also configured to
boost the bass. The rubber ring 17 is configured to be worn on the ear. However, the speaker
unit using such a diaphragm 7 has a problem that high frequency reproduction is difficult. This is
due to the following reasons. That is, in order to give the rigidity of the diaphragm 7, the shape of
the diaphragm 7 is dome-shaped. Means for Solving Problems The technical means of the
present invention for solving the above problems is to make the shape of the above-mentioned
diaphragm a flat plate and stick an aluminum plate to the center of the moving plate in order to
give rigidity. And partially vapor deposited. Function The function by this technical means is as
follows. That is, since the center part is made of a polyethylene terephthalate material at the edge
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part and the aluminum plate is attached at the center part or the rigidity is increased by partial
deposition, high frequency reproduction is realized as a characteristic of the speaker unit. It will
be expanded.
Embodiments of the present invention will be described below with reference to the attached
drawings. Referring to FIG. 1, the magnet 21 and the pole piece 22 are bonded and incorporated
into the yoke 23, and the yoke 24 is insert-molded into a frame 24 to form a magnetic circuit.
The terminal 25 is bonded to the rear surface of the yoke 23, and the magnet 21. ポールピース
22. The yoke 23 and the terminal 25 are fixed as the eyelet 2. The diaphragm attachment
ring 28 attached to the peripheral edge of the frame 24 is made of a material such as brass, and
the peripheral edge of the diaphragm 27 made of polyethylene terephthalate film is adhered to
the upper surface of the diaphragm attachment ring 28. The edge portion 27-A of the diaphragm
27 is made of polyethylene terephthalate as it is, and the flat plate-shaped central portion 27-B is
formed of an aluminum plate or an aluminum layer 27-C formed by partial deposition of
aluminum. . A voice coil 26 is bonded to the diaphragm 27 and is embedded in the magnetic gap
of the magnetic circuit. The lead wire of the voice coil 26 is soldered to the terminal 25. A
protector 31 made of stainless steel and a dustproof net 3o are bonded to the front of the frame
24. At this time, the moving plate 27 is a polymer film of polyethylene terephthalate film made of
the same material as the edge and the center, and the center is formed into a flat plate, and only
the center is an aluminum plate, or even aluminum. It has a structure having a partially deposited
aluminum layer 27-C. The damping cloth 32 is used for damping the property and is adhered to
the frame 24. FIG. 2 also shows an earbud headphone incorporating the speaker unit of the
present invention. The input cord 35 is soldered to the speaker unit 38 via the bushing 34 in the
housing 33. The spiral port 36 is also configured for bass enhancement. The rubber ring 37 is
used for attachment to the ear. The sound pressure frequency characteristic of the speaker unit
38 of the present invention according to this configuration is as shown by the solid line in FIG. 3,
and the high frequency band is extended compared to the conventional speaker unit shown by
the broken line, and wide band reproduction is possible. As described above, according to the
present invention, the sound pressure frequency characteristic of the speaker unit is obtained by
providing the central portion of the diaphragm with a flat plate shape and providing an
aluminum plate or an aluminum layer by partial deposition of aluminum to increase the rigidity.
It is possible to make it possible to expand the high frequency reproduction with a large
industrial value.
[0002]
Brief description of the drawings
[0003]
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FIG. 1 is a cross-sectional view showing an embodiment of a speaker unit according to the
present invention, and FIGS. FIG. 4 is a cross-sectional view of a conventional speaker unit, and
FIGS. 5a and 5b are a front view and a cross-sectional view of an innoer-ear type headphone
incorporating the conventional speaker unit.
21 ...... Agenetto, 22 ..... pole piece, 23 ...... York, 24 ..... frame, 25 ..... terminal, 26 ..... voice Coil, 27-diaphragm, 27-person: edge part, 27-B: central part, 27-C: aluminum layer, 28: diaphragm
Sticking ring, 29: Eyelet, 3 o: Dustproof net, 31: Protector, 32: Damping cloth. Name of Agent
Attorney Nakao Toshio and 1 other person l l F2 tight or Sakakai fortune イ イ ワ ン ン Figure 2
ζ 紗, 36 Figure 4 Figure 5
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