close

Вход

Забыли?

вход по аккаунту

?

DESCRIPTION JP2013219642

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 JP2013219642
Abstract: [Problem] To provide a thin speaker capable of simultaneously realizing thinning and
good bass reproduction. A diaphragm 2 in the form of a film is disposed in a gap between
magnet groups 3a to 7a and 3b to 7b disposed facing each other, a voice coil 2b is provided on
the diaphragm 2, and magnets adjacent in the horizontal direction The diaphragm 2 emits a
sound wave from the area of (b), and the diaphragm 2 has a mountain-like or roll-like area
between horizontally adjacent magnets, and the voice coil 2b is provided on this area It is
characterized by [Selected figure] Figure 1
Thin speaker
[0001]
The present invention relates to a thin speaker having magnets disposed opposite to each other,
and a diaphragm in the form of a film being disposed in the gap between the magnets, for
example, suitable as an acoustic device such as an ultra thin display. is there.
[0002]
With the thinning of TVs and mobile devices, thinning of speakers mounted on these is also
required.
Conventionally, as a thin speaker, a cone-shaped speaker is generally designed to be thin. For
example, the thickness is reduced by increasing the apex angle of the cone. In addition, there is
12-04-2019
1
also a product that is made thinner by accommodating the magnetic circuit in the recess of the
cone in the shape of an inverted cone. However, a general cone-type speaker has a limitation in
thinning due to its structure in which a cone-shaped diaphragm is driven to produce sound.
[0003]
Therefore, for example, as described in Patent Documents 1 to 3, a diaphragm in which a voice
coil is fixed by adhesion or the like is formed on a flat plastic film, and the diaphragm is opposed
to the same pole in the horizontal direction. A thin speaker has been developed which achieves
sound emission by being disposed in the gap between magnet groups arranged at predetermined
intervals so that adjacent poles are alternately different.
[0004]
In this type of thin speaker, when a drive current flows through the voice coil, an electromagnetic
force along the thickness direction of the diaphragm acts on the voice coil according to Fleming's
left-hand rule to vibrate the plastic film as the diaphragm. Sound is generated at
By using such a film-shaped diaphragm, it is possible to make it thinner than a cone type.
[0005]
JP-A-62-160900 JP-A-51-121322 JP-A-2011-171780
[0006]
However, since the diaphragm has a film-like planar shape, there is a problem that the amplitude
can not be large and the bass reproduction is not sufficient.
Also, in order to stabilize the performance, it is necessary to fix the periphery while applying
tension to the diaphragm (plastic film), which also adversely affects the bass reproduction.
[0007]
The present invention has been proposed in view of the above, and an object of the present
12-04-2019
2
invention is to provide a thin speaker which can simultaneously realize thinning and good bass
reproduction.
[0008]
In order to solve the above problems, in the thin loudspeaker of the present invention according
to claim 1, the diaphragm 2 in the form of a film is disposed in the gap between the magnet
groups 3a to 7a and 3b to 7b disposed facing each other. 2 is a thin speaker provided with a
voice coil 2b on the top and emitting sound waves from the area between magnets adjacent in
the horizontal direction, wherein the diaphragm 2 has a chevron or roll shape in the area
between the magnets adjacent in the horizontal direction , And the voice coil 2b is provided on
this area.
[0009]
According to a second aspect of the present invention, in the thin loudspeaker according to the
first aspect, the facing surfaces of the magnet groups 3a to 7a and 3b to 7b are the same poles,
and the horizontally adjacent poles are alternately different. The magnetic circuit is constituted
by the magnets adjacent in the direction, and the voice coil 2b is arranged corresponding to the
gap for sound wave emission provided between the magnets adjacent in the horizontal direction,
The magnetic field is formed by adjacent magnets of the opposite polarity.
[0010]
The invention according to claim 3 is the thin speaker according to claim 1 or 2, wherein
deformation prevention of the magnets is performed in the central portion of the opposing
surfaces of at least a pair of opposing magnets in the magnet groups 3a to 7a and 3b to 7b. Are
provided with reinforcing and fixing members 11a and 11b for fixing the magnets facing each
other.
[0011]
According to the thin speaker of the present invention according to the first aspect, by forming
the unevenness on the diaphragm, the diaphragm can be expanded and contracted in the
horizontal direction, and the displacement in the vertical direction can be increased to
advantageously reproduce the bass.
Further, by disposing a portion having a mountain shape or a roll shape of the diaphragm in the
12-04-2019
3
region between the magnets adjacent in the horizontal direction, it is possible to prevent the
diaphragm from coming into contact with the components of the speaker.
Furthermore, since the rigidity of the entire diaphragm can be expected to be increased by the
presence of the mountain-shaped or roll-shaped portion of the diaphragm, the performance can
be stabilized.
By this, it is possible to simultaneously realize thinning and good bass reproduction.
[0012]
Further, in the thin loudspeaker according to the second aspect of the present invention, since a
magnetic flux sufficient to obtain a driving force sufficient to vibrate the diaphragm is present
between magnets adjacent in the horizontal direction, the chevron or roll shape of the diaphragm
is The portion which it has can also be made to contribute to vibration, and the driving force of a
diaphragm can be raised.
[0013]
Furthermore, in the thin speaker according to claim 3, the reinforcing and fixing member can
prevent the magnets from being deformed by the repulsive force of the opposing magnets of the
same pole.
Moreover, since the central part of the opposing magnets of the same pole has a weak magnetic
field, the influence on the magnetic circuit by providing the reinforcing and fixing member can
be reduced.
[0014]
It is sectional drawing of the thin speaker which concerns on embodiment of this invention, (a)
FIG. Is sectional drawing of the center part of the transversal direction, (b) A sectional view of the
other part of the transversal direction.
12-04-2019
4
It is an exploded view of the thin speaker shown in FIG. The diaphragm in the thin speaker
shown in FIG. 1 and FIG. 2 is shown, (a) a perspective view, (b) a magnified view of one end side
of the voice coil in (a) a diagram, (c) a diagram (A) It is an enlarged view of the other end side of
the voice coil in a figure. It is for demonstrating two magnetic distribution which adjoins the
horizontal direction of the magnet arrange | positioned opposingly, (a) The figure of magnetic
distribution, (b) The figure seen from the side.
[0015]
Hereinafter, an embodiment of the present invention will be described based on the drawings.
[0016]
FIG. 1 is a cross-sectional view of different positions in the short side direction in a thin speaker
according to an embodiment of the present invention, and FIG. 2 is an exploded view of the thin
speaker shown in FIG.
FIG. 1 (a) shows a cross section of the central portion (AA ′ line) in the short direction in the
state where the thin speaker of FIG. 2 is assembled, and FIG. 1 (b) shows an end portion (BB ′)
in the short direction. Line) is shown.
[0017]
As shown in FIGS. 1 and 2, in this thin speaker, the outer peripheral portion of the film-like
diaphragm 2 is between the pair of frames 1-1 and 1-2 having the track-like openings 1a and 1b,
respectively. It is stretched in a pinched state. Bar-like magnet groups 3a to 7a and bar-like
magnet groups 3b to 7b are arranged in parallel on the upper and lower surfaces of the
diaphragm 2, respectively.
[0018]
The magnet groups 3a to 7a and the magnet groups 3b to 7b are disposed at predetermined
intervals such that opposing poles are the same and poles adjacent in the horizontal direction are
alternately different. Further, the facing corner portions of the magnet groups 3a to 7a and the
12-04-2019
5
magnet groups 3b to 7b are respectively tapered. A magnetic circuit is formed between the
magnets adjacent in the horizontal direction by the magnet groups 3a to 7a and 3b to 7b.
[0019]
An upper panel 9-1 and a lower panel 9-2 in which circular sound holes 8-1 and 8-2 are
arranged in a matrix are joined to both sides of the frames 1-1 and 1-2. The sound hole 8-1 is
formed to be located between the magnet groups 3a to 7a adjacent in the horizontal direction,
and the sound hole 8-2 is also between the magnet groups 3b to 7b adjacent in the horizontal
direction. It is formed to be located.
[0020]
As shown in FIGS. 3A to 3C, the diaphragm 2 is composed of a plastic film 2a and a voice coil
(drive coil) 2b formed in a track shape on the plastic film 2a. . The voice coil 2b is a spiral wiring
continuous from one end T1 arranged at the outermost periphery to the other end T2 inside, and
a predetermined number adjacent in the longitudinal direction is made into one set, and this set
is arranged at a predetermined interval It has a linear portion 2ba and bent portions 2bb and 2bc
at both ends. In the present example, four wires are adjacent to the four linear portions 2ba and
densely arranged.
[0021]
The area under the voice coil 2b in the plastic film 2a protrudes in a chevron shape or a roll
shape (semicircular shape) with respect to the sound wave radiation direction (upper in FIG. 1
and FIG. 3). A wire acting as the voice coil 2b is fixed by adhesion or the like.
[0022]
As shown in FIG. 1, the diaphragm 2 has a mountain-shaped or roll-shaped portion between the
magnet groups 3a to 7a and the magnet groups 3b to 7b arranged with the same poles facing
each other in the horizontal direction. Are disposed so as to be located in the gaps between
adjacent magnets.
[0023]
12-04-2019
6
Reinforcing / fixing members 11a and 11b for preventing and fixing the deformation of the
magnets 5a and 5b are provided at the central portions of the opposing surfaces of at least a pair
of opposing magnets in the magnet groups 4a to 6a and 4b to 6b. .
The reinforcing and fixing members 11a and 11b are used as an aid when driving the large
diaphragm 2, and the distance between the opposing magnets 5a and 5b and the distance
between the diaphragm 2 and the magnets 5a and 5b are accurate. Act to keep in
[0024]
The reinforcing and fixing members 11a and 11b are members made of a plastic material such as
glass-containing ABS or a nonmagnetic metal material having a plate-like shape narrower than
the magnets 5a and 5b and slightly shorter in length, respectively. The diaphragms 2 are fixed by
an adhesive or the like along the longitudinal direction of each of the magnets 5a and 5b, and the
diaphragm 2 is sandwiched by applying pressure from both sides on the back side of the fixed
surface.
Between the magnets 3a and 3b at both ends of the magnet group, and a part of the frame in the
longitudinal direction of the frames 1-1 and 1-2 between the magnets 7a and 7b, respectively,
the deformation of the magnets is prevented and the magnets are opposed. The magnets are
fixed to each other.
[0025]
The reinforcing and fixing members 11a and 11b are provided corresponding to the magnets 5a
and 5b in the central portion in this example, but are appropriately provided according to the
size of the diaphragm 2, the pattern of the voice coil 2b, and the like. For example, it is not
necessary for extremely narrow ones, and it is preferable to increase from one to a plurality as it
becomes wider.
[0026]
12-04-2019
7
In the configuration as described above, the magnetic distribution between adjacent magnets and
the gap is the magnetic flux density of the tapered corner portions of the magnets 3a, 3b, 4a, 4b
as shown in FIGS. The diaphragm 2 can be efficiently driven by disposing the voice coil 2b in the
vicinity of the corner portion of the magnets 3a and 4a adjacent in the horizontal direction. Also,
in the region between the magnets 3a and 4a adjacent in the horizontal direction, the magnetic
flux density of the diaphragm 2 is high, and there is a magnetic flux sufficient to obtain a
sufficient driving force. Can also contribute to vibration. Further, since the central part of the
opposing magnets of the same pole generates a relatively weak magnetic field, the influence on
the magnetic circuit by providing the reinforcing and fixing members 11a and 11b can be
reduced.
[0027]
Therefore, according to the configuration as described above, by forming the concavities and
convexities in the diaphragm 2, the diaphragm 2 can be expanded and contracted in the
horizontal direction, the displacement in the vertical direction is increased, and the bass
reproduction is advantageously performed. By arranging the mountain-shaped or roll-shaped
portion of the diaphragm 2 in the region between the magnets adjacent in the horizontal
direction, it is possible to prevent the diaphragm 2 from contacting the components of the
speaker. As a result, even if the thickness is about 5 mm, sufficient bass reproduction can be
performed as compared with the prior art, so it is suitable as an acoustic device of an ultra-thin
display such as an organic EL television that will appear in the future.
[0028]
Further, since the rigidity of the entire diaphragm 2 can be expected to be increased by the
presence of the mountain-shaped or roll-shaped portion of the diaphragm 2, the performance can
be stabilized. In the case of the small diaphragm 2, the outer asperity has an effect of increasing
the amplitude in the vertical direction, and the inner asperity contributes to the increase in
rigidity. By this, it is possible to simultaneously realize thinning and good bass reproduction.
[0029]
In addition, since a magnetic flux sufficient to drive the voice coil 2b is also present in the gap
between the magnets adjacent in the horizontal direction, the mountain-shaped or roll-shaped
portion of the diaphragm 2 can also contribute to the vibration. The driving force of the
diaphragm can be increased.
12-04-2019
8
[0030]
Further, by providing the reinforcing and fixing members 11a and 11b, it is possible to prevent
the magnets from being deformed by the repulsive force of the opposing magnets of the same
pole.
By installing the reinforcing and fixing members 11a and 11b, the amplitude of the diaphragm 2
is suppressed, but the effect of increasing the amplitude in the vertical direction by the uneven
portion having the mountain shape or the roll shape of the diaphragm 2 You can keep it.
Moreover, since the central part of the opposing magnets of the same pole has a weak magnetic
field, the influence on the magnetic circuit by providing the reinforcing and fixing members 11a
and 11b can be reduced.
[0031]
In the above embodiment, the case where the plastic film 2a is used as the diaphragm 2 has been
described as an example, but it goes without saying that other materials can be used. Although
the voice coil 2b is fixed to the plastic film 2a by adhesion or the like, a metal foil or the like may
be formed on the plastic film 2a and a pattern of the voice coil 2b may be formed by etching.
[0032]
1-1, 1-2 frame 1a, 1b opening 2 diaphragm 2a plastic film 2b voice coil 2ba linear portion 2bb,
2bc bent portion 3a to 7a, 3b to 7b magnet group 8-1, 8-2 sound hole 9-1 Upper panel 9-2
Lower panel 11a, 11b Reinforcing and fixing member T1 One end of voice coil T2 other end of
voice coil
12-04-2019
9
Документ
Категория
Без категории
Просмотров
0
Размер файла
18 Кб
Теги
description, jp2013219642
1/--страниц
Пожаловаться на содержимое документа