close

Вход

Забыли?

вход по аккаунту

?

JP2001238289

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 JP2001238289
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used in various audio equipment.
[0002]
2. Description of the Related Art In recent years, since a speaker is attached to both sides or the
lower part of a cathode ray tube in a television receiver, a small-sized, narrow speaker having a
magnetic shielding type has conventionally been used. With the development of electronic
devices, it has been increasingly required to make the speakers smaller and narrower (narrower).
[0003]
Such a conventional speaker will be described with reference to the cross-sectional view of the
speaker shown in FIG.
[0004]
In the same figure, 36 is composed of a bottom plate 33 having a center pole, a ring-shaped main
magnet 32, a ring-shaped top plate 31, a ring-shaped cancel magnet 34 and a shield cover 35
covering the outer periphery. The frame 8 is coupled to the top surface of the magnetic circuit
36.
13-05-2019
1
[0005]
Also, 10 is a voice coil, and the damper 9 supports the middle portion of the voice coil 10 so that
the lower portion fits into the magnetic gap 37 of the magnetic circuit 36 without eccentricity.
The outer peripheral portion of the damper 9 is coupled to the frame 8.
[0006]
The diaphragm 11 has an outer peripheral portion coupled to the frame 8 through the edge 12
and a central portion of the diaphragm 11 and an upper portion of the voice coil 10 coupled to
each other. Is covered with a dust cap 13.
[0007]
The operation of the conventional speaker configured as described above will be described
below.
First, when an input signal is applied to the voice coil 10, the voice coil 10 in the magnetic gap
37 is driven according to Fleming's left-hand rule, and this driving force causes the diaphragm
11 to oscillate and emit sound waves into the air. It is a thing.
[0008]
However, in order to miniaturize and narrow the outer shape of the speaker, it is necessary to
miniaturize and narrow the magnetic circuit 36, and the speaker 32 of the above-described
conventional structure has a magnet 32. , 34 also need to be miniaturized.
However, if the main magnet 32 is miniaturized, a high magnetic flux density can not be
obtained, and a small diameter of the voice coil 10 must be used, and the outer periphery of the
main magnet 32 is made close to the inner periphery of the shield cover 35 And the leakage of
magnetism increases, and a sufficient magnetic shielding effect can not be obtained.
13-05-2019
2
[0009]
The present invention solves the above-mentioned problems, and it is an object of the present
invention to provide a speaker having high magnetic resistance, high sound pressure, and high
input resistance in space saving speakers such as small speakers and narrow speakers.
[0010]
[Means for Solving the Problems] In order to solve the above problems, the speaker according to
claim 1 of the present invention has a magnet attached to the inner peripheral side surface of the
shield cover of the speaker, and the main magnet is a shield cover The magnetic flux attached to
the inner periphery of the shield cover cancels out the leakage flux of the main magnet even if it
is brought close to it, and the external leakage can be suppressed and the space between the
shield cover and the main magnet can be made small. The width can be reduced, contributing to
downsizing and narrowing of the speaker.
[0011]
According to a second aspect of the present invention, there is provided the speaker according to
the first aspect, wherein at least the shield cover of the speaker according to the first aspect is
elongated, the magnet is mounted on the longer diameter inner peripheral side , It is possible to
suppress the magnetic flux leakage from the large diameter side which has a large influence, and
to provide an excellent speaker with less leakage flux to the outside which can be attached to a
narrower space which is a feature of the elongated speaker. .
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a loudspeaker according
to the present invention will be described below with reference to FIGS. 1 to 3. FIG.
[0013]
(First Embodiment) FIG. 1 is for explaining the invention of claim 1 of the claims of the present
invention, and the configuration of the whole speaker is the same as that of the prior art. The
magnetic circuit 7 includes a ring-shaped top plate 1, a ring-shaped main magnet 2, a bottom
plate 3 with a center pole, a ring-shaped cancel magnet 4, a shield cover 5, and a thin ringshaped inner surface of the shield cover 5. The rubber magnet 6 is arranged.
[0014]
8 is a frame coupled to the upper surface of the magnetic circuit 7, 9 is a damper for holding the
13-05-2019
3
voice coil 10 embedded in the magnetic gap of the magnetic circuit 7, 11 is a central portion
coupled to the voice coil 10 and a peripheral portion The diaphragm 13 is connected to the
peripheral portion of the frame 8 through the edge 12, and 13 is a dust cap attached to the
upper surface of the central portion of the diaphragm 11.
[0015]
Next, the rubber magnet 6, which is a difference from the prior art, will be described in relation
to the main magnet 2. If the main magnet 2 is magnetized such that the top plate 1 side is N pole,
the bottom plate side is S It is a pole.
The rubber magnet 6 magnetized in the S pole on the side in contact with the portion of the S
pole on the bottom plate 3 side is disposed.
[0016]
With the above configuration, the magnetic flux leaked from the main magnet 2 is canceled by
the rubber magnet 6 even when the outer shape of the main magnet 2 is made close to the inner
periphery of the shield cover 5, and the leaked magnetic flux to the outside is small. Since the
outer shape of the main magnet 2 can be enlarged, a high magnetic flux density can be obtained.
In addition, since the outer shape of the magnet can be made large, the diameter of the voice coil
10 can be made large, and the input resistance can be improved.
[0017]
In the above description, the cancel magnet 4 has a ring shape, but may have another shape such
as a cylindrical shape, and may be omitted if leakage of the magnetic flux to the rear does not
occur depending on the attachment state to the device.
[0018]
(Second Embodiment) FIG. 2 is an exploded perspective view of another embodiment of the
speaker according to the present invention, FIG. 3 (a) is a cross-sectional view of the same length
side, and FIG. 3 (b) is the same short diameter. It is sectional drawing of the side.
13-05-2019
4
[0019]
Referring to FIGS. 2 and 3, 21 is a top plate having an elongated outer shape and having a center
hole, 22 a main magnet having an elongated shape and having a center hole, 23 a bottom plate
having a center pole, and 24 having an elongated cancellation. A magnet 25 is an elongated
shield cover, and sheet-like thin rubber magnets 26a and 26b are disposed on the inner surface
on the long side of the shield cover 25.
8 is a frame, 9 is a damper, 10 is a voice coil, 11 is a diaphragm, and 13 is a dust cap.
[0020]
Next, the rubber magnets 26a and 26b will be described in relation to the main magnet 22. If the
main magnet 22 is such that the top plate 21 side is magnetized to the N pole, the bottom plate
23 side is the S pole.
The rubber magnets 26a and 26b magnetized in the S pole on the side in contact with the
portion of the S pole on the bottom plate 23 side are disposed inside the long side of the shield
cover 25.
[0021]
In a speaker having an elongated magnetic circuit, it is easy to increase the size of the magnet or
plate in the direction of the long side because there is often a dimensional margin on the long
side, but the size of the short side is Many restrictions can not be extended often.
However, by configuring as described above, even in the speaker having the elongated magnetic
circuit, the same effect as that of the first embodiment can be obtained.
[0022]
13-05-2019
5
As in the first embodiment, the cancel magnet 24 can be omitted depending on the position of
the speaker set.
[0023]
As described above, since the speaker of the present invention is configured, even if the main
magnet is brought close to the shield cover, the magnet attached to the inner peripheral side
surface of the shield cover cancels the leakage flux of the main magnet and the outside Since the
leakage is suppressed, the distance between the shield cover and the main magnet can be
reduced, and the magnetic circuit portion can be miniaturized and narrowed, which contributes
to the miniaturization and narrowing of the speaker.
13-05-2019
6
Документ
Категория
Без категории
Просмотров
0
Размер файла
13 Кб
Теги
jp2001238289
1/--страниц
Пожаловаться на содержимое документа