close

Вход

Забыли?

вход по аккаунту

?

DESCRIPTION JP2000032589

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
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 JP2000032589
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker suitable for application to a small speaker.
[0002]
2. Description of the Related Art Conventionally, as a small-sized speaker, one as shown in FIG. 6
has been proposed. As shown in FIG. 6, this speaker comprises a ring magnet 1 having N and S
poles magnetized in the vertical direction, a ring plate 2 mounted so as to sandwich the ring
magnet 1, and a center pole 3a. A yoke 3 integrally formed with the flange 3 b is provided, and a
magnetic gap 4 is formed between the inner peripheral side of the plate 2 and the center pole 3 a
of the yoke 3.
[0003]
A speaker frame 5 is attached to the plate 2 and an edge 7 is provided on the outer peripheral
portion of the diaphragm 6. The outer peripheral portion of the cone-shaped diaphragm 6 is held
by the frame 5 by the edge 7 ing. 8はガスケットである。
[0004]
12-04-2019
1
On the other hand, a voice coil bobbin 9 is attached to the inner peripheral portion of the
diaphragm 6, and a voice coil 10 is wound around the voice coil bobbin 9. The voice coil 10 has a
plate 2 and a center pole 3a of the yoke 3. Are inserted into the magnetic gap 4 formed by
[0005]
Further, in FIG. 6, reference numeral 11 denotes a damper for holding the voice coil 10 in the
magnetic gap 4.
As the damper 11, for example, a spiral damper in which a cloth is impregnated with a synthetic
resin is used.
[0006]
Reference numeral 12 denotes an input terminal, and an acoustic signal from the input terminal
12 is supplied to the voice coil 10 through the tinsel wire 13. Reference numeral 14 denotes a
dust intrusion preventing cap which covers the upper surface of the voice coil bobbin 9.
[0007]
As shown in FIG. 6, in the speaker, a ring-shaped magnet 1 → plate 2 → magnetic gap 4 →
center pole 3a of the yoke 3 → flange 3b → ring-shaped magnet 1 constitutes a magnetic circuit.
Since the yoke 2 and the yoke 3 have different polarities, as shown in FIG. 6, there is a
disadvantage that the magnetic flux flows directly from the plate 2 to the flange 3 b of the yoke
3.
[0008]
A speaker using a canceling magnet as shown in FIG. 7 has been proposed as a speaker for
eliminating such a leakage flux.
The parts corresponding to those in FIG. 6 will be assigned the same reference numerals as those
in FIG.
12-04-2019
2
[0009]
In FIG. 7, a ring-shaped cancel magnet 15 magnetized in the direction opposite to the main drive
magnet 1 is mounted in the vicinity of the outer periphery of the lower surface of the flange 3b
of the yoke 3 of FIG. A bottomed cylindrical shield cover 16 is attached so as to cover the cancel
magnet 15 so as to eliminate the leakage flux. Others are configured in the same manner as in
FIG.
[0010]
As described above, the speaker provided with the cancel magnet 15 and the shield cover 16 as
shown in FIG. 7 has the disadvantage that the magnetic circuit becomes large and the main
magnet 1 and the speaker are canceled. The two magnets 1 and 15 need to be magnetized
separately because the polarity is opposite to that of the magnet 15. If the number of parts is
large, there is a disadvantage that the number of assembling steps is large.
[0011]
In view of the foregoing, it is an object of the present invention to provide a loudspeaker in which
a magnetic circuit having no leakage flux is obtained with a simple configuration and the
magnetic flux of the magnetic circuit is increased.
[0012]
SUMMARY OF THE INVENTION In the speaker according to the present invention, the center
pole and the flange are integrally formed of a plastic magnet and a pole piece is provided on the
center pole, and the outer periphery of the flange and the outer periphery of the pole piece And a
magnetic circuit having a magnetic gap formed between the yoke and the pole piece.
[0013]
According to the present invention, the magnetic flux from the magnet in which the center pole
and the flange are integrally formed by the plastic magnet flows from the flange → the yoke →
the magnetic gap → the pole piece → the center pole, and this magnetic circuit has a simple
structure. Since no leakage flux is generated, a cancel magnet and a shield cover are not required,
and a small and thin speaker can be obtained by that amount.
12-04-2019
3
[0014]
In addition, since the center pole and the flange are magnetized, the magnetic force is increased
and the resonance acuity Q at the lowest resonance frequency of the speaker can be reduced.
The reproduction band can be expanded.
[0015]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the speaker
according to the present invention will be described below with reference to FIG.
In FIG. 1, parts corresponding to FIG. 6 are given the same reference numerals.
[0016]
In this embodiment, as shown in FIG. 2, a flanged center pole 20 obtained by integrally molding
the center pole 20a and the flange 20b with a plastic magnet is used. The plate-like pole piece 21
is adhesively fixed.
[0017]
Between the outer periphery of the flange 20b of the flanged center pole 20 and the outer
periphery of the pole piece 21, a yoke 22 made of a magnetic material having an inverted Lshaped cross section is adhesively fixed to the outer periphery of the flange 20b. A magnetic air
gap 4 is formed between the outer peripheral surface of the pole piece 21 and the surface of the
yoke 22 facing the pole piece 21.
[0018]
In this case, the flanged center pole 20 is formed of an isotropic plastic magnet, and a magnetic
field is applied between the tip of the center pole 20a and the outer periphery of the flange 20b.
For example, the tip of the center pole 20a is N The outer periphery of the pole 20b is
magnetized with the S pole.
[0019]
Further, in this case, a recess 23 is provided at the center of the lower surface of the flanged
12-04-2019
4
center pole 20, and this recess 23 can be used as a positioning when assembling the speaker.
Further, a dowel 24 is formed on the upper surface of the yoke 22 so that the dowel 24 can be
used for mounting the frame 5.
[0020]
The speaker frame 5 is attached to the upper surface of the yoke 22 by caulking, for example,
the dowel 24 and the outer peripheral portion of the cone type diaphragm 6 provided with the
edge 7 on the outer peripheral portion thereof is held by the gasket 8. Do.
[0021]
On the other hand, a voice coil bobbin 9 is attached to the inner peripheral portion of the
diaphragm 6, and a voice coil 10 is wound around the voice coil bobbin 9. The voice coil 10 is
mounted on the outer peripheral surface of the pole piece 21 and the yoke 22. It is inserted into
the magnetic gap 4 formed between the pole piece 21 and the opposite surface.
[0022]
The voice coil 10 is held by the damper 11 in the magnetic gap 4.
As the damper 11, for example, a spiral damper in which a cloth is impregnated with a synthetic
resin is used.
Further, a cap 14 for preventing dust intrusion is provided so as to cover the upper surface of the
voice coil bobbin 9.
[0023]
Further, an acoustic signal from the input terminal 12 provided at a predetermined position of
the frame 5 is supplied to the voice coil 10 through the tinsel wire 13.
[0024]
Since the loudspeaker according to this embodiment is constructed as described above, the
12-04-2019
5
magnetic flux from the magnet integrally formed by the plastic magnet with the center pole 20a
and the flange 20b is: Since it flows from the yoke 22 to the flange 20b and does not generate a
leakage magnetic flux, it is possible to obtain a magnetically shielded speaker with a simple
configuration and to obtain a small speaker that is thin by that without using a cancel magnet
and a shield cover. There is a profit that can be done.
[0025]
Further, according to the present embodiment, since the center pole 20a and the flange 20b are
magnetized, the magnetic force of the flange 20b can also be utilized, and the magnetic circuit
having such a strong magnetic force is obtained. There is a merit that the resonance sharpness Q
can be reduced, and the reproduction band of the bass can be easily expanded using a small
speaker box.
[0026]
FIGS. 3, 4 and 5 respectively show other examples of the embodiment of the present invention.
In the example of FIGS. 3, 4 and 5, in the examples of FIGS. 3, 4 and 5, the parts corresponding to
the example of FIG.
[0027]
In the example of FIG. 3, the yoke 22 of FIG. 1 is composed of a magnet 22a, and the contact side
of the outer periphery of the flange 20b of the flanged center pole 20 of this magnet 22a with,
for example, S pole is N pole. The side facing the piece 21 is taken as the S pole.
Others are configured in the same manner as in FIG.
[0028]
In the example of FIG. 3, the same function and effect as the example of FIG. 1 can be obtained
and the yoke 22 of FIG. 1 is formed of the magnet 22a, so that the magnetic force of the
magnetic circuit can be further increased. .
12-04-2019
6
[0029]
In the example of FIG. 4, the yoke 22 of FIG. 1 is composed of a ring-shaped magnet 25 and a
plate 26, and the side of the ring-shaped magnet 25 that contacts the outer periphery of the
flange 20b of the flanged center pole 20 is, for example Let N pole and the side in contact with
the plate 26 be S pole.
The frame 5 is mounted on the plate 26.
Others are configured in the same manner as in FIG.
[0030]
It can be easily understood that the same function and effect as those of FIG. 1 can be obtained
also in this example of FIG.
Furthermore, as compared with the example of FIG. 1, the example of FIG. 4 is provided with the
ring-shaped magnet 25 in the magnetic circuit, so the magnetic force of the magnetic circuit is
increased by the magnetic force of the magnet 25.
[0031]
Further, in the example of FIG. 5, the yoke 22 of FIG. 1 is constituted of a ring-shaped yoke 27
and a hollow disk-shaped magnet 28. The frame 5 is mounted on the hollow disk-shaped magnet
28.
Others are configured in the same manner as in FIG.
[0032]
12-04-2019
7
In this example of FIG. 5, it is easy to understand that the same effect as that of the example of
FIG. 1 can be obtained.
Furthermore, as compared with the example of FIG. 1, the example of FIG. 5 is provided with the
hollow disk-like magnet 28 in the magnetic circuit, so the magnetic force of the magnetic circuit
is increased by the magnetic force of the hollow disk-like magnet 28.
[0033]
Of course, the present invention is not limited to the above-described example, and various other
configurations can be adopted without departing from the scope of the present invention.
[0034]
According to the present invention, the magnetic flux from the magnet in which the center pole
and the flange are integrally formed by the plastic magnet flows from the center pole to the pole
piece to the magnetic gap to the yoke to the flange to generate a leakage magnetic flux. Since
there is no need for a cancel magnet and a shield cover, there is an advantage that it becomes a
magnetically shielded speaker with a simple configuration and can obtain a small speaker that is
thin by that amount.
[0035]
Further, according to the present invention, since the center pole and the flange are magnetized,
the magnetic force of the flange portion can also be utilized, and the magnetic circuit becomes
stronger accordingly, and the resonance sharpening at the lowest resonance frequency of the
speaker is achieved. There is a benefit that the degree Q can be reduced and the bass
reproduction band can be easily expanded using a small speaker box.
[0036]
Brief description of the drawings
[0037]
1 is a cross-sectional view showing an example of an embodiment of the speaker of the present
invention.
12-04-2019
8
[0038]
2 is a perspective view showing an example of the subject matter of the present invention.
[0039]
3 is a cross-sectional view showing another example of the embodiment of the present invention.
[0040]
4 is a cross-sectional view showing another example of the embodiment of the present invention.
[0041]
5 is a cross-sectional view showing another example of the embodiment of the present invention.
[0042]
6 is a cross-sectional view showing an example of a conventional speaker.
[0043]
7 is a cross-sectional view showing an example of a conventional speaker.
[0044]
Explanation of sign
[0045]
4. Magnetic gap, 5. Frame, 6. Vibrator, 9. Voice coil bobbin, 10. Voice coil, 20. Centered pole with
flange, 20a .. Center pole, 20b .. Flange, 21 .. .. Pole piece, 22 .. Yoke, 22a .. Magnet, 25 .. Ring
magnet, 26 .. Plate, 27 .. Ring yoke, 28 .. Hollow disc magnet
12-04-2019
9
Документ
Категория
Без категории
Просмотров
0
Размер файла
16 Кб
Теги
jp2000032589, description
1/--страниц
Пожаловаться на содержимое документа