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JP2011010167

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2011010167
An object of the present invention is to provide a speaker which is excellent in input resistance
and bass reproduction ability, and which can be miniaturized and thinned without increasing
parts cost and manufacturing cost. A diaphragm 2 of a speaker 1 has an elongated shape, and at
least two recesses 2a are formed along the longitudinal direction. The voice coil 4 is fixed by the
side surface portions of these concave portions 2a, and the voice coil 4 is fixed by the rib 2c of
the wide portion 2b formed in the short direction of the diaphragm 2. The inner peripheral
portion of the edge 3 joined to the front side of the diaphragm 2 is joined to the diaphragm 2
inside the outer peripheral end of the diaphragm 2, so the outer diameter of the voice coil 4 and
the outer diameter of the diaphragm 2 Even if is increased, the width of the edge 3 is not
narrowed under the influence thereof. According to the present speaker 1, the aperture of the
voice coil 4 can be enlarged without narrowing the width of the edge 3, and high input resistance
can be achieved. [Selected figure] Figure 1
Speaker and diaphragm
[0001]
The present invention relates to a speaker and a diaphragm for the speaker.
[0002]
Speakers are widely used not only in home audio equipment and in-vehicle audio equipment, but
also in personal computers, mobile phones, game machines and various electronic devices.
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1
As electronic devices are becoming lighter, thinner, smaller and smaller, smaller, thinner and
higher-performance loudspeakers are also required. In addition to the excellent sound quality,
high input tolerance is required for high performance.
[0003]
The electronic device is required to have high input resistance while having an elongated shape
because the installation space of the speaker is limited. The elongated speaker is limited in its
minor axis size, so that the voice coil diameter can not be increased, which is disadvantageous for
the input resistance. If the voice coil aperture is increased without changing the minor diameter
of the speaker, the edge width is narrowed accordingly, the amplitude of the diaphragm is
limited, and as a result, the input resistance can not be increased. In addition, when the edge
width is narrowed, the lowest resonance frequency is also increased, and the reproduction
performance in the low band is deteriorated.
[0004]
FIG. 5 is a cross-sectional view of a conventional elongated speaker 21. The cross sectional
structure of the short diameter side of the speaker 21 is shown on the left side, and the cross
sectional structure of the long diameter side is shown on the right side. The speaker 21 of FIG. 5
is fixed to the frame 22, the magnetic circuit 23 coupled to the frame 22, the voice coil 24
supported in the magnetic gap of the magnetic circuit 23, and the outer peripheral portion to the
frame 22 via the edge 25. And the damper 27 whose inner periphery is fixed to the voice coil 24
and whose outer periphery is fixed to the frame 22; and the center cap 28 covering the front of
the voice coil 24; Is equipped.
[0005]
In the speaker 21 of FIG. 5, if the diameter of the voice coil 24 is increased in order to achieve
high input resistance, the width of the short diameter side edge 25 becomes narrower, the
minimum resonance frequency is increased, and the reproduction capability in the low band is
improved. It will deteriorate. Patent Document 1 is an example for solving such a problem.
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2
[0006]
FIG. 6 is a view showing the structure of the elongated speaker 31 described in Patent Document
1. As shown in FIG. 6 (a) is a cross-sectional view of the speaker 31, and FIG. 6 (b) is a
perspective view of an essential part of the speaker 31. FIG. In FIG. 6A, as in FIG. 5, the crosssectional structure on the short diameter side of the speaker 31 is shown on the left, and the
cross-sectional structure on the long diameter side is shown on the right.
[0007]
The voice coil 32 of the speaker 31 of FIG. 6 is disposed on the short diameter side outside the
inner periphery of the edge 33, and one of the front end portions of the voice coil 32 so that the
edge 33 and the voice coil 32 do not contact. Part 35 is cut out. Therefore, the diameter of the
voice coil 32 can be increased without narrowing the width of the short diameter side edge 33,
and high input resistance can be secured.
[0008]
Moreover, there exists patent document 2 as another example which solves the said problem.
FIG. 7 is a cross-sectional view of the speaker 41 described in Patent Document 2. As shown in
FIG. In the speaker 41 of FIG. 7, the diameter of the voice coil 43 is larger than the diameter of
the diaphragm (central dome) 42, and the expansion member 44 is disposed between the voice
coil 43 and the diaphragm 42. The inner peripheral portion of the edge (outer peripheral dome)
45 is joined to the
[0009]
By providing the expansion member 44 in the speaker 41 of FIG. 7, the width of the edge 45
does not have to be narrowed even if the diameter of the voice coil 43 is increased, and the input
resistance can be increased.
[0010]
Patent No. 3956485 gazette JP, 2006-311156, A
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[0011]
However, in Patent Document 1 described above, processing for cutting out the front end portion
of the voice coil 32 is necessary, and also in assembling the speaker 31, the workability is
deteriorated because the voice coil 32 has directivity.
These can be a factor in rising component costs and manufacturing costs.
[0012]
Moreover, in patent document 2, while the expansion member 44 is needed and components cost
rises, an assembly man-hour increases and manufacturing cost will also rise.
[0013]
The present invention has been made to solve the above-mentioned problems, and the object
thereof is to achieve miniaturization and thinning with excellent input resistance and bass
reproduction ability without raising parts cost and manufacturing cost. To provide a speaker and
a diaphragm.
[0014]
In order to solve the above problems, in one aspect of the present invention, a diaphragm, a
frame disposed from the outer peripheral side to the rear of the diaphragm, an inner peripheral
portion is joined to the diaphragm, and an outer peripheral portion is the above A speaker
comprising: an edge joined to a frame; a magnetic circuit disposed rearward of the diaphragm
and joined to the frame; and a voice coil supported in a magnetic gap of the magnetic circuit. The
diaphragm includes at least two recesses disposed at an interval substantially equal to the
diameter of the voice coil along a first direction, and a second direction different by
approximately 90 degrees from the first direction. And a rib formed along the outer diameter of
the voice coil and formed along the outer peripheral edge of the diaphragm including the wide
portion; In the first direction A speaker is provided, which is joined to the side surface of the two
recesses and joined to the rib of the wide part in the second direction.
[0015]
Further, in one aspect of the present invention, at least two recesses disposed at an interval
substantially equal to the diameter of the voice coil along the first direction, and a second that
differs by approximately 90 degrees from the first direction. And a rib formed along an outer
12-05-2019
4
peripheral edge including the wide portion, the rib being formed in the direction of the outer
diameter of the voice coil, and the rib in the first direction. There is provided a diaphragm for a
speaker, characterized in that the voice coil is fixed by side surfaces of two concave parts and the
voice coil is fixed by the rib of the wide part in the second direction.
[0016]
According to the present invention, it is possible to provide a speaker which is excellent in input
resistance and bass reproduction ability, and which can be miniaturized and thinned without
increasing parts cost and manufacturing cost.
[0017]
The perspective view of the principal part of the speaker 1 concerning one embodiment of the
present invention.
Fig.2 (a) is the top view seen from the front of the speaker 1, FIG.2 (b) is the sectional view on the
AA line of Fig.2 (a), FIG.2 (c) is BB of FIG.2 (a) Line cross section.
Fig.3 (a) is the top view which looked at the diaphragm 2 from the front, FIG.3 (b) is the CC
sectional view taken on the line of Fig.3 (a).
The figure which shows the cross-section of the speaker 1 whole provided with the structure of
FIGS.
Sectional drawing of the conventional elongate-shaped speaker 21. FIG.
The figure which shows the structure of the speaker 31 of the elongate shape described in patent
document 1. FIG.
FIG. 6 is a cross-sectional view of a speaker 41 described in Patent Document 2.
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[0018]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings.
[0019]
FIG. 1 is a perspective view of the main part of a speaker 1 according to an embodiment of the
present invention, in which a frame and a magnetic circuit are omitted.
The speaker 1 shown in FIG. 1 includes an elongated diaphragm 2, an elongated edge 3 disposed
so as to surround the diaphragm 2, and a voice coil 4 attached to the back of the diaphragm 2.
[0020]
The inner periphery of the edge 3 is joined to the diaphragm 2, and the outer periphery of the
edge 3 is joined to a frame (not shown). The voice coil 4 is supported in the magnetic gap of a
magnetic circuit (not shown). More specifically, the voice coil 4 includes a voice coil bobbin and a
voice coil wound around the outer periphery of the bobbin. However, in the present specification
and drawings, the voice coil bobbin and the voice coil are combined to be a voice coil. Call it 4
[0021]
Fig.2 (a) is the top view seen from the front of the speaker 1, FIG.2 (b) is the sectional view on the
AA line of Fig.2 (a), FIG.2 (c) is BB of FIG.2 (a) FIG. 3 (a) is a plan view of the diaphragm 2 viewed
from the front, and FIG. 3 (b) is a cross-sectional view taken along the line C-C of FIG. 3 (a).
[0022]
As shown in FIG. 1, since the voice coil 4 is attached to the back surface of the diaphragm 2, the
position of the voice coil 4 is indicated by a broken line in FIG. 2 (a). As shown in FIG. 3, in the
diaphragm 2, three recesses 2 a are formed along the longitudinal direction (first direction), and
the voice coil 4 is formed on the side surfaces of the two adjacent recesses 2 a. It is fixed.
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[0023]
The diaphragm 2 is formed with a wide portion 2 b corresponding to the mounting position of
the voice coil 4. The wide portion 2 b has an outer shape that overlaps with a part of the outer
diameter of the voice coil 4.
[0024]
A rib 2c extending rearward is formed at the outer peripheral edge of the diaphragm 2, and a rib
2c is also formed at the end of the wide portion 2b. As shown in FIG. 2C, the voice coil 4 is fixed
by the rib 2c at the end of the wide portion 2b.
[0025]
As described above, the voice coil 4 is fixed from both sides at the side part 2 of the recess 2 a in
the longitudinal direction of the diaphragm 2 and is fixed from both sides by the ribs 2 c in the
short direction (second direction). The voice coil 4 is joined to the diaphragm 2 at the location.
When bonding the voice coil 4 and the diaphragm 2, for example, an adhesive member may be
attached to at least one of the voice coil 4 and the diaphragm 2 to bond the both. The specific
bonding form is not limited.
[0026]
The concave portion 2a, the wide portion 2b and the rib 2c of the diaphragm 2 are all integrally
molded, and are constituted by one member. For example, paper or resin is used as the material
of this member, but the material is not particularly limited.
[0027]
As shown in FIG. 2B and FIG. 2C, the diaphragm 2 has a gently curved surface shape in the short
side direction, and the center line in the short side direction protrudes most forward.
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[0028]
An edge 3 is joined to the front outer periphery of the diaphragm 2.
The inner peripheral portion 3 a of the edge 3 is joined to the diaphragm 2 inside the outer
peripheral edge of the diaphragm 2, and as shown in FIG. It is larger than the inner diameter. The
outer peripheral edge of the diaphragm 2 is not in contact with the edge 3. Since the outer
diameter in the short direction of the diaphragm 2 is substantially equal to the outer diameter of
the voice coil 4, according to the present embodiment, the outer diameter of the voice coil 4 can
be made larger. That is, in the case of the present embodiment, in order to increase the outer
diameter of the voice coil 4, it is necessary to increase the outer diameter of the diaphragm 2 in
accordance therewith, but even if the outer diameter of the diaphragm 2 is increased, Since it is
premised that the edge 3 is joined to the diaphragm 2 inside the outer peripheral edge of the
diaphragm 2, there is no possibility that the width of the edge 3 will be narrowed by the increase
of the outer diameter of the diaphragm 2. Therefore, the problem that the width of the edge 3 is
narrowed and the minimum resonance frequency is raised does not occur due to the effect of
increasing the diameter of the voice coil 4 which has conventionally been a problem.
[0029]
Thus, according to the present embodiment, even if the outer diameter of the voice coil 4 is
increased, the width of the edge 3 is not affected. Therefore, it is possible to easily cope with the
increase in diameter of the voice coil 4.
[0030]
FIG. 4 is a view showing the cross-sectional structure of the entire speaker 1 provided with the
structure of FIGS. The speaker 1 of the present embodiment may be of an internal magnet type
or an external magnet type. FIG. 4 (a) is a cross-sectional view of the internal magnet type
speaker 1 and FIG. 4 (b) is a cross-sectional view of the external magnet type speaker 1. As
shown in FIG.
[0031]
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The speaker 1 shown in FIGS. 4A and 4B includes the damper 5, the frame 6 and the magnetic
circuit 7 in addition to the diaphragm 2, the edge 3 and the voice coil 4 having the abovedescribed structure. There is.
[0032]
The magnetic circuit 7 shown in FIG. 4A includes a pot yoke 8 joined to the inner periphery of
the frame 6, a magnet 9 disposed inside the pot yoke 8, and a pole piece 10 disposed on the
front of the magnet 9. And.
[0033]
The magnetic circuit 7 shown in FIG. 4B is disposed between the top plate 11 disposed around
the voice coil 4, the bottom yoke 12 disposed on the rear side of the frame 6, and the top plate
11 and the bottom yoke 12. And a magnet 9.
[0034]
As shown in FIG. 4, regardless of whether the magnetic circuit 7 is of the inner or outer magnet
type, the structure of the diaphragm 2 can be the one shown in FIGS. 1 to 3, and the diaphragm 2
and voice coil Since the arrangement of 4 and the edge 3 is the same as in FIG. 1, the aperture
diameter of the voice coil 4 can be increased and the reproduction capability in the low range
can be improved.
[0035]
Although FIG. 1 illustrates an example in which three concave portions 2a are formed in the
diaphragm 2 and the two voice coils 4 are fixed by these three concave portions 2a, when only
one voice coil 4 is provided, the diaphragm 2 is used. Two concave portions 2a may be provided.
That is, at least two concave portions 2a are formed in the diaphragm 2 of the present
embodiment.
Since the distance between two adjacent recesses 2 a is substantially equal to the outer diameter
of the voice coil 4, it is necessary to set the distance between the recesses 2 a in accordance with
the outer diameter of the voice coil 4.
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[0036]
The present embodiment is also applicable to the case where the number of voice coils 4 is three
or more.
In this case, the concave portions 2 a and the wide portions 2 b may be formed in the diaphragm
2 in a number corresponding to the number of voice coils 4.
[0037]
Summarizing the above, the diaphragm 2 of the present embodiment has an elongated shape,
and at least two concave portions 2a are formed along the longitudinal direction.
The voice coil 4 is fixed by the side surface portions of these concave portions 2a, and the voice
coil 4 is fixed by the rib 2c of the wide portion 2b formed in the short direction of the diaphragm
2. The inner periphery 3 a of the edge 3 joined to the front side of the diaphragm 2 is joined to
the diaphragm 2 inside the outer peripheral end of the diaphragm 2, so the outer diameter of the
voice coil 4 and the outside of the diaphragm 2 Even if the diameter is increased, the width of the
edge 3 is not narrowed due to the influence. Therefore, according to the present embodiment, the
diameter of the voice coil 4 can be increased without narrowing the width of the edge 3, and high
input resistance can be achieved. In addition, since the width of the edge 3 does not have to be
narrowed, the lowest resonance frequency can be maintained low, and the reproduction ability in
the low band can be improved.
[0038]
Moreover, since the recessed part 2a and the rib 2c are integrally molded, the diaphragm 2 of
this embodiment can be assembled, without increasing the number of parts or the number of
operation processes, and workability | operativity becomes good. Thereby, the speaker 1 of the
present embodiment can be manufactured without increasing the parts cost and the
manufacturing cost.
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[0039]
The aspects of the present invention are not limited to the above-described individual
embodiments, but include various modifications that those skilled in the art can conceive, and the
effects of the present invention are not limited to the contents described above. That is, various
additions, modifications and partial deletions can be made without departing from the conceptual
idea and spirit of the present invention derived from the contents defined in the claims and the
equivalents thereof.
[0040]
DESCRIPTION OF SYMBOLS 1 speaker 2 diaphragm 2a recessed part 2b wide part 2c rib 3 edge
4 voice coil 5 damper 6 frame 7 magnetic circuit 8 pot yoke 9 magnet 10 pole piece 11 top plate
12 bottom yoke
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