close

Вход

Забыли?

вход по аккаунту

?

JP2011239125

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 JP2011239125
PROBLEM TO BE SOLVED: To provide an electrodynamic speaker having an elongated edge
including a support movable portion connecting an inner peripheral portion and an outer
peripheral portion, which can suppress peak dip of reproduced sound pressure frequency
characteristics and has high efficiency. Provided is an electrodynamic speaker which has a
sufficiently high reproduction sound pressure level, is excellent in reproduction sound quality,
and is suitable for being attached to a device such as a display. SOLUTION: In the cross-sectional
shape of the corner roll portion of the edge, the length of the central straight portion of the
corner roll portion, the length of the inner peripheral straight portion, and the length of the outer
peripheral straight portion are respectively from the long side to the short side From the smallest
to the largest and then from the smallest to the smallest, and is defined correspondingly to the
central plane, which is the plane defined correspondingly to the central straight line, and the
inner circumference straight line An inner peripheral upstanding wall which is a curved surface
and an outer peripheral upstanding wall which is a curved surface defined corresponding to the
outer peripheral straight line are respectively formed. [Selected figure] Figure 3
Edge and electrodynamic speaker using the same
[0001]
The present invention is an edge supporting an elongated substantially rectangular diaphragm
having a short diameter direction shorter than the major axis direction, which is excellent in
sound reproduction capability and suitable for being attached to a device such as a display. It
relates to the electric speaker.
[0002]
11-05-2019
1
In audio equipment such as a display to which a speaker for reproducing sound is attached, it is
required to miniaturize a space required to attach the speaker.
In particular, the elongated (rectangular, rectangular, oval (including elliptical) track type)
electrodynamic speaker has a divided vibration unique to the elongated speaker diaphragm in
which the diaphragm area is limited in the minor axis direction. When it is attempted to adopt a
speaker magnetic circuit with a high magnetic flux density in the magnetic gap that makes it
difficult to obtain a flat reproduction sound pressure frequency characteristic, the width of the
magnetic circuit is wider than the speaker diaphragm, making it impossible to miniaturize. There
are disadvantages in sound reproduction capability for various reasons such as. Therefore, in
order to solve these problems, various speaker diaphragms, edges, magnetic circuits for speakers,
and electrodynamic speakers using the same have been proposed.
[0003]
A conventional elongated speaker has a motion comprising a elongated coil having a major axis
direction and a minor axis direction and a voice coil including a elongated bobbin, an elongated
diaphragm on which the bobbin is fixed at its center, and an edge. In the electronic speaker, a
track in which the outer peripheral end of the diaphragm and the inner peripheral part of the
edge are formed by a pair of long sides along the major axis direction and a pair of arcs
connecting the pair of long sides The outer periphery of the edge and the fixed part of the frame
are formed of a pair of long sides along the major axis direction and a pair of short sides along
the minor axis connecting the pair of long sides. The movable support portion has a long side roll
portion corresponding to the track-shaped long side of the inner peripheral portion and a short
side roll portion corresponding to the arc of the inner peripheral portion, and the short side The
cross-sectional shape and dimensions of the roll portion, the connecting portion with the long
side roll portion and Gradually change so that the roll width becomes the largest in the short
diameter direction and is approximately the same as the cross-sectional shape and dimensions of
the long-side roll, and corresponds to the connecting corner with the long and short sides of the
outer periphery of the edge There is an edge for the speaker to do (patent document 1).
[0004]
On the other hand, conventionally, in the case of a so-called square speaker provided with a
diaphragm having a substantially rectangular edge at the joint with the roll edge, the roll inner
curvature of the arc portion of the roll edge coupled to the corner of the diaphragm There is a
11-05-2019
2
square speaker which makes the same as or larger than the outer curvature (Patent Document 2).
Since the width of the roll of the edge portion coupled to the corner portion of the diaphragm is
larger than that of the linear portion and the inner circumferential curvature of the roll is large,
the increase of the compliance due to the expansion and contraction in the circumferential
direction is suppressed In general, the edge compliance can be reduced, thereby reducing the
lowest resonance frequency and expanding the low frequency reproduction capability.
[0005]
Also, for example, the width dimension at the corner portion of the edge to be attached to the
frame is made larger than the width dimension at the straight portion of the edge, and the
stiffness at the corner portion is integrated with the cone having the voice coil. There is a speaker
device characterized in that the stiffness of the straight portion is equal to or smaller than the
stiffness of the straight portion (Patent Document 3). In the speaker device shown in FIGS. 3 and
4 of Patent Document 3, as a result of forming the width at the corner of the edge to be larger
than the width at the straight portion of the edge, the cross-sectional shape of the corner 9b of
the edge 9 A straight line portion appears as the vertex of the edge is extended. However, the
detailed configuration including the cross-sectional shape other than the cross-section illustrated
in FIG. 4 of Patent Document 3 is unclear for the shape of the corner portion 9b of the edge 9,
and in the cross-section illustrated in FIG. Roll portions of a single arc substantially equal to the
roll shape of the straight portion of the edge 9 are formed at both ends of the portion, and are
continuous with the inner circumferential portion and the outer circumferential portion of the
edge, respectively.
[0006]
JP, 2009-201005, A (Fig. 1, Fig. 2) A real fair 3-14878 (Fig. 1a-2b) A real opening 60-144390
(Fig. 3-4)
[0007]
However, none of the prior art speakers is sufficient.
11-05-2019
3
The speaker described in Patent Document 1 is a special type having a track-shaped coil having a
major axis direction and a minor axis direction and a voice coil including a track-type bobbin, and
a track-type diaphragm to which the bobbin is fixed at its center. Speakers, which are not always
suitable for elongated speakers having a substantially rectangular diaphragm. In the case of a
substantially rectangular diaphragm close to a square, although the edge described in Patent
Document 2 or 3 is effective, in the case of an elongated speaker having a rectangular
diaphragm, a long side connected to a corner portion of the edge Since the configurations of the
side and short side edges are significantly different, there is a problem that excessive stress is
applied to the corner portions, the sound pressure frequency characteristics may be disturbed, or
edge breakage may occur.
[0008]
The present invention has been made to solve the above-mentioned problems of the prior art,
and its object is to provide an electrodynamic type having an elongated edge including a support
movable portion connecting an inner peripheral portion and an outer peripheral portion. With
regard to the speaker, an electrodynamic speaker capable of suppressing peak dip of reproduced
sound pressure frequency characteristics, having high efficiency and sufficiently high reproduced
sound pressure level, excellent in reproduced sound quality and suitable for attaching to a device
such as a display To provide.
[0009]
The edge of the present invention comprises an inner peripheral portion joined to the outer
peripheral end of an elongated diaphragm having a long diameter direction and a short diameter
direction, an outer peripheral portion connected to the fixed portion of the frame, an inner
peripheral portion and an outer peripheral portion An elongated peripheral edge including a
supporting movable portion, and a front shape of inner and outer peripheral portions of the edge
includes a pair of long sides along a major axis direction and a pair of long sides It is a
substantially rectangular shape defined by a pair of short sides along a short diameter direction
to be connected and four corner portions connecting one long side and one short side in a
substantially arc shape, The section includes a long side roll section including an arc with a single
cross section corresponding to the long side section, and a cross section including an arc having
a single cross section corresponding to the short side section, the entire height is the same as the
entire height of the long side roll section And a corner roll portion whose total height is equal to
the total height of the long side roll portion and the short side roll portion corresponding to the
corner portion, In the circumferential cross-sectional shape, the center straight portion which is a
straight line defining the entire height, the inner circumferential side arc portion which is a
circular arc continuously formed on the inner circumferential end of the central straight portion,
and the center An inner peripheral straight portion which is a straight line continuously formed
on the outer peripheral arc portion which is an arc continuously formed on the outer peripheral
11-05-2019
4
end of the linear portion and an inner peripheral end of the inner peripheral side arc portion And
a straight line continuously formed on the outer circumferential end of the outer circumferential
arc portion and including an outer circumferential straight portion connected to the outer
circumferential portion, the length of the central straight portion of the corner roll portion and
the length of the inner circumferential straight portion And the length of the outer peripheral
straight portion is respectively increased from the minimum to the maximum from the long side
to the short side and then reduced again to the minimum, and is defined corresponding to the
central straight portion Corresponding to a central flat portion which is a flat surface, an inner
peripheral upright wall portion which is a curved surface defined corresponding to an inner
peripheral straight portion, and an outer peripheral straight portion And an outer peripheral
erect wall portion is a curved surface to be constant, but are formed respectively.
[0010]
Preferably, in the edge according to the present invention, the radius defining the inner
circumferential arc and the outer circumferential arc in the sectional shape of the corner roll of
the support movable portion of the edge is from the long side to the short side Decrease from
maximum to minimum and then increase again to maximum.
[0011]
Preferably, in the electrodynamic loudspeaker according to the present invention, the edge, the
diaphragm to which the inner peripheral portion of the edge and the outer peripheral end are
joined, and the frame to which the outer peripheral portion of the edge and the fixing portion are
joined; It further comprises a voice coil coupled to the diaphragm, and a magnetic circuit coupled
to the frame and having a magnetic air gap in which the coil of the voice coil is disposed.
[0012]
Hereinafter, the operation of the present invention will be described.
[0013]
The edge of the present invention comprises an inner peripheral portion joined to the outer
peripheral end of an elongated diaphragm having a long diameter direction and a short diameter
direction, an outer peripheral portion connected to the fixed portion of the frame, an inner
peripheral portion and an outer peripheral portion An elongated peripheral edge including a
supporting movable portion, and a front shape of inner and outer peripheral portions of the edge
includes a pair of long sides along a major axis direction and a pair of long sides It is a
11-05-2019
5
substantially rectangular shape defined by a pair of short sides along the short diameter
direction to be connected and four corner portions connecting one long side and one short side
in a substantially arc shape.
Further, in the electrodynamic speaker according to the present invention, the edge, the
diaphragm in which the inner peripheral portion of the edge and the outer peripheral end are
joined, the frame in which the outer peripheral portion of the edge and the fixing portion are
joined, and the diaphragm And a magnetic circuit connected to the frame and having a magnetic
air gap in which the coil of the voice coil is disposed.
Therefore, even if the space to which the audio device is attached is narrow, it is possible to
realize an elongated electrodynamic speaker that can be attached with excellent reproduction
sound quality.
[0014]
In the edge of the present invention, the supporting movable portion includes a long side roll
portion including an arc having a single cross section corresponding to the long side, and an
entire height including an arc having a single cross section corresponding to the short side Is
equal to the total height of the long side roll portion, and the corner roll portion corresponding to
the corner portion, whose total height is equal to the total height of the long side roll portion and
the short side roll portion.
That is, this edge is a roll edge whose height is uniform over the entire circumference of the
elongated shape and whose popping dimension is constant.
The long side roll portion corresponding to the long side portion and the short side roll portion
corresponding to the short side portion are roll edges each consisting of a circular arc in cross
section, and in some cases, a straight line in part of the cross section It is a roll edge including a
part.
The width of the long side roll portion may be different from the width of the short side roll
portion. Preferably, the width in the cross sectional shape of the long side portion of the support
movable portion of the edge is the cross sectional shape of the short side portion It is better to be
11-05-2019
6
larger than the width in.
[0015]
On the other hand, the corner roll connecting the long side roll and the short side roll is a roll
edge in which the cross section in the circumferential direction is not composed of only a single
arc. In the corner roll portion, since the cross-sectional shape gradually changes depending on
the angle in the circumferential direction, the long side roll portion and the short side roll portion
can be smoothly connected. The width of the corner roll portion in the circumferential crosssectional shape may have a width equal to or greater than any of the width of the long side roll
portion and the width of the short side roll portion. The angular roll portion has, in the
circumferential cross-sectional shape, a central straight portion which is a straight line defining
the entire height, an inner circumferential arc portion which is a circular arc continuously formed
on the inner peripheral end of the central straight portion, and a central portion An inner
peripheral straight portion which is a straight line continuously formed on the outer peripheral
arc portion which is an arc continuously formed on the outer peripheral end of the linear portion
and an inner peripheral end of the inner peripheral side arc portion And an outer peripheral
straight portion which is a straight line continuously formed on the outer peripheral end of the
outer peripheral arc portion and connected to the outer peripheral portion.
[0016]
Therefore, in the corner roll portion, the central flat portion which is a plane defined
corresponding to the central linear portion, the inner peripheral upright wall portion which is a
curved surface defined corresponding to the inner peripheral linear portion, and the outer
peripheral linear portion An outer peripheral standing wall portion, which is a curved surface
which is defined, is formed. The length of the central straight portion increases from the
minimum to the maximum from the long side to the short side and then decreases again to the
minimum according to the change of the angle in the circumferential direction. Form In addition,
the length of the inner circumferential straight portion increases from the minimum to the
maximum from the long side to the short side and then decreases again to the minimum
according to the change of the angle in the circumferential direction. The inner circumferential
straight portion forms an inner circumferential wall. Similarly, the length of the outer peripheral
straight portion increases from the minimum to the maximum from the long side to the short
side and then decreases again to the minimum in accordance with the change of the angle in the
circumferential direction. The outer peripheral straight line portion forms an outer peripheral
upright wall portion. On the other hand, the radius defining the inner circumferential arc and the
11-05-2019
7
outer circumferential arc in the sectional shape of the corner roll of the supporting movable
portion of the edge is reduced from the maximum to the minimum from the long side to the short
side And then grow again to the maximum.
[0017]
In this manner, the overall height is defined in the cross-sectional shape in the circumferential
direction so that not only the flat and strong central flat portion but also the inner
circumferential wall and outer circumferential wall which enhance the rigidity are formed in the
corner roll portion. Center straight part, inner straight line part and outer straight line part, so
that the rigidity of the corner roll is enhanced to withstand the excessive stress which tends to be
concentrated on the corner roll. It is possible to prevent the disconnection and to suppress the
peak dip of the reproduced sound pressure frequency characteristic, and to improve the
reproduced sound quality of the electrodynamic speaker using this edge. In the electrodynamic
speaker of the present invention, by setting the shape of the elongated edge as described above,
even if the electrodynamic speaker has a substantially rectangular diaphragm, the divided
vibration of the diaphragm is suppressed, and the efficiency is improved. And the playback sound
pressure level can be increased to improve playback sound quality and input resistance.
[0018]
The electrodynamic speaker according to the present invention can suppress the peak dip of
reproduced sound pressure frequency characteristics even if the electrodynamic speaker is
provided with an approximately rectangular diaphragm having a major axis direction and a
minor axis direction and an edge. Thus, it is possible to provide an electrodynamic speaker
having high efficiency, sufficiently high reproduction sound pressure level, and excellent
reproduction sound quality.
[0019]
It is a figure explaining the electrodynamic-type speaker 1 by preferable embodiment of this
invention.
(EXAMPLE 1) A diagram for explaining an edge 3 according to a preferred embodiment of the
present invention. (Example 1) FIG. 6 is a view for explaining a corner roll 30 of an edge 3
according to a preferred embodiment of the present invention. (Example 1) It is a figure
11-05-2019
8
explaining the change of the cross-sectional shape of the angle | corner roll part 30 of the edge 3
by preferable embodiment of this invention. (Example 1) It is a figure explaining change of the
section shape of corner roll part 40 of edge 3x of a comparative example. (Comparative example
1)
[0020]
The following describes the electrodynamic speaker according to the preferred embodiments of
the present invention, but the present invention is not limited to these embodiments.
[0021]
FIG. 1 is a view for explaining an electrodynamic speaker 1 according to a preferred embodiment
of the present invention, and more specifically, a perspective view of the electrodynamic speaker
1 viewed obliquely from above on the front side.
The electrodynamic speaker 1 of the present embodiment is a slender electrodynamic speaker
having a substantially rectangular speaker diaphragm 2 having a length in the major axis
direction of about 16.0 cm and a minor axis length of about 4.0 cm. In addition, as described
later, a part of the structure of the electrodynamic speaker 1, an internal structure, and the like
are omitted. The direction in which the straight line connecting points A-A 'extends is the major
axis direction, and the direction in which the straight line connecting points B-B' extends is the
minor axis direction.
[0022]
The speaker diaphragm 2 having a substantially rectangular outer shape is a flat diaphragm
formed by press-forming a paper having five rectangular vibration surface portions each having
a substantially rectangular shape and a slightly convex central portion, and the outer periphery
thereof is edged by the edge 3 The end is supported, and the outer peripheral end of the edge 3
is fixed to the frame 6. A gasket 5 is connected to the front side of the outer peripheral end of the
edge 3. Further, on the back side of the speaker diaphragm 2, a total of three (not shown)
rectangular voice coils and a rectangular head coil member (not shown) connecting these in a
grid shape of one vertical row and three horizontal rows are provided. A voice coil assembly 4
(not shown) is connected. The speaker diaphragm 2 may be a flat diaphragm press-forming PSP,
PP, foamed PP, paper, aluminum alloy or the like, or it may be formed by punching out a flat
11-05-2019
9
material made into a thin plate. May be
[0023]
In the voice coil assembly 4 (not shown), a rectangular head coil member connects rectangular
voice coils correspondingly to three portions of the center and both ends of the five rectangular
vibration surface portions, and a pair of adjacent rectangular voices A rectangular space in which
no voice coil is disposed is defined between the coils, and rectangular voice coils are separated
and connected in a substantially lattice shape. In the voice coil assembly of this embodiment,
since the rectangular bobbin and the rectangular head coil member are formed of an aluminum
material which is lightweight and has sufficient rigidity when formed in a rectangular shape, the
rectangular voice coils are closely attached to each other. It is possible to secure sufficient
strength to drive the flat diaphragm 2 over the entire surface, even if it is not made to By driving
the flat diaphragm 2 over the entire surface of the speaker 1, it is difficult for split vibration to
occur and flat frequency characteristics can be obtained.
[0024]
Further, the frame 6 has an elongated shape corresponding to the track-shaped speaker
diaphragm 2, and the magnetic circuit 10 fixed to the frame 6 also has an elongated shape
having a narrow width equal to or less than the length in the short diameter direction.
Specifically, the magnetic circuit 10 fixed to the frame 6 includes three magnetic circuits having
magnetic gaps corresponding to the shapes of the three rectangular voice coils of the voice coil
assembly 4. From the window on the back side of the frame 6, components constituting the
vibration system such as the magnetic circuit 10 and the voice coil assembly 4 are exposed.
Therefore, the electrodynamic speaker 1 is a speaker suitable for a device having a small width
for attaching the speaker, such as a side portion of a display unit of a device such as a display.
[0025]
A speaker vibration system comprising the speaker diaphragm 2, the edge 3 and the voice coil
assembly 4 is vibratably supported relative to the frame 6. In the electrodynamic speaker 1,
when a voice current is supplied to the rectangular voice coil of the voice coil assembly 4, a
driving force acts on the rectangular voice coil disposed in the magnetic gap of the magnetic
circuit 10, and the voice coil assembly 4 Vibrates in the front-rear direction, and the coupled
11-05-2019
10
speaker diaphragm 2 also vibrates in the front-rear direction. The back and forth in the
electrodynamic speaker 1 refers to the side on which the voice coil 4 and the magnetic circuit 10
are attached when the speaker diaphragm 2 vibrates is the rear side, and the speaker diaphragm
2 and the edge 3 are The exposed side is the front side.
[0026]
Figures 2, 3 and 4 illustrate edge 3 according to a preferred embodiment of the present
invention. Specifically, FIG. 2 is a plan view of the electrodynamic speaker 1 including the edge 3,
and FIG. 3 is a portion S 1 surrounded by a dotted line in the perspective view of FIG. 1 including
the corner roll portion 30 of the edge 3. It is the perspective view which expanded. FIG. 4 is a
view for explaining the change of the cross-sectional shape of the corner roll portion 30 of the
edge 3 and an enlarged view of a portion S2 surrounded by a dotted line in the plan view of FIG.
Including several cross-sectional views at intervals of 15 °.
[0027]
The edge 3 is formed, for example, by impregnating a woven fabric in which a plurality of warps
and wefts of cotton and polyester fibers are substantially orthogonal with each other to
impregnate rubber as a base material, heat molding with a mold, and cutting the inner periphery
and outer periphery It is a roll edge for an elongated speaker, and its thickness is about 0.2 mm.
The edge 3 is, for example, a foamed rubber injected into a mold, hot press molded and foamed
to obtain a predetermined shape, and the inner and outer peripheral sides are cut by a cutting die
to form a substantially annular shape It may be a speaker edge shaped into an elongated roll
edge.
[0028]
The edge 3 has a substantially rectangular and planar inner peripheral portion 31 joined with the
outer peripheral end of the speaker diaphragm 2, and a substantially rectangular and planar
outer peripheral portion 32 including a plane joined with the frame 6, and an inner peripheral
portion 31. And a support movable portion 33 configured in a roll shape in which a cross section
in the radial direction connecting the outer peripheral portion 32 and the outer peripheral
portion 32 is continuous. The front shapes of the inner peripheral portion 31 and the outer
peripheral portion 32 and the support movable portion 33 of the edge 3 are a pair of long side
11-05-2019
11
portions along the major axis direction and a minor axis direction connecting the pair of long
sides. It is a substantially rectangular shape defined by a short side portion of a set and four
corner portions connecting one long side and one short side in a substantially arc shape.
Specifically, the external dimensions of the edge 3 are about 139.1 mm in the major axis
direction and about 35.0 mm in the minor axis direction. The internal dimensions of the edge 3
are about 123.9 mm in the major axis direction and about 19.8 mm in the minor axis direction.
[0029]
The supporting movable portion 33 of the edge 3 is generally an up-roll shape convex in the
forward direction, and corresponds to the long side roll portion 34 including an arc having a
single cross section corresponding to the long side, and the short side And the entire height of
the short side roll portion 35 corresponding to the corner portion is the same as that of the long
side roll portion and the short side roll portion. And an angular roll portion 30 having the same
height as the full height. The long side roll portion 34 is a convex roll whose cross sectional
shape is defined from a single arc having a radius of 1.5 mm, a width Lw1 of about 3.5 mm, and
a total height Lh of about 1.9 mm. The planar inner peripheral portion 31 and the outer
peripheral portion 32 are connected to each other at the long side portion. Similarly, the short
side roll portion 35 is a convex roll whose cross sectional shape is defined from a single arc
having a radius of 1.5 mm, the width Lw2 is about 3.5 mm, and the total height Lh is long. The
planar inner peripheral portion 31 and the outer peripheral portion 32 are connected at the
short side portion so as to be equal to the total height Lh of the side roll portion 34.
[0030]
FIG. 4 is a cross-sectional view showing how the cross-sectional shape changes in the angular roll
portion 30 formed following the long side roll portion 34 and the short side roll portion 35 of
the edge 3 at intervals of 15 °. FIG. As illustrated in FIG. 4, the cross-sectional shape of the
corner roll unit 30 includes a convex roll defined from a single arc at the long side roll unit 34 at
an angle of 0 degrees shown in FIG. In the case of the angle of 90 degrees shown in FIG. 4 (g),
the convex-shaped roll in the short side roll part 35 is included. The width Lw0 of the crosssectional shape of the corner roll portion 30 is the width Lw1 of the long side roll portion 34 at
an angle of 0 degrees, and the angle even when the angle is 15 degrees to 75 degrees shown in
FIGS. The width Lw2 of the short side roll portion 35 at 90 degrees is not changed and is
constant. When the width Lw1 of the long side roll portion 34 is larger than the width Lw2 of the
short side roll portion 35, the width Lw0 of the cross section of the corner roll portion 30 is Lw1
or less and Lw2 or more according to the angle. It may change smoothly.
11-05-2019
12
[0031]
The four corner roll portions 30 are arcs continuously formed at the inner peripheral end of the
central linear portion 30a, which is a straight line defining the total height Lh, and the inner
peripheral end of the central linear portion 30a in the cross-sectional shape in each
circumferential direction It is a straight line continuously formed on the inner circumferential
end of the outer circumferential arc portion 30c which is an arc continuously formed on the
outer circumferential end of the circumferential straight arc portion 30b and the central straight
portion 30a, and on the inner circumferential end of the inner circumferential side arc portion
30b. It includes an inner peripheral straight portion 30d connected to the inner peripheral
portion 31 and an outer peripheral straight portion 30e which is a straight line continuously
formed on the outer peripheral end of the outer peripheral arc portion 30c and connected to the
outer peripheral portion 32. The central straight portion 30a is a straight line extending in a
direction substantially orthogonal to the direction in which the speaker diaphragm 2 and the
voice coil assembly 4 vibrate. Therefore, the maximum height of the support movable portion of
the edge 3 is the entire height Lh over the entire circumference, and is substantially constant.
[0032]
The length of the central straight portion 30a of the corner roll portion 30 of the edge 3, the
length of the inner circumferential straight portion 30d, and the length of the outer
circumferential straight portion 30e respectively extend from the long side roll portion 34 to the
short side roll portion 35 It increases from the minimum to the maximum and then decreases
again to the minimum. That is, the length of the central straight portion 30a, the length of the
inner circumferential straight portion 30d, and the length of the outer circumferential straight
portion 30e change as the angle in the circumferential direction changes, and the angle 45
degrees shown in FIG. The longest in the vicinity of Specifically, the length of the central straight
portion 30a changes in the range of 0 mm to about 1.4 mm, the length of the inner
circumferential straight portion 30d changes in the range of 0 mm to about 1.6 mm, and the
outer peripheral straight line The length of the portion 30e varies in the range of 0 mm to about
1.0 mm.
[0033]
11-05-2019
13
On the other hand, the radius defining the inner circumferential arc portion 30 b and the outer
circumferential arc portion 30 c in the sectional shape of the corner roll portion 30 of the edge 3
is from the maximum from the long side roll portion 34 to the short side roll portion 35 It
decreases to the minimum and then increases again to the maximum. That is, the radius defining
the inner circumferential arc portion 30b and the radius defining the outer circumferential arc
portion 30c are respectively smallest around the angle of 45 degrees shown in FIG. It is. The
radius defining the inner circumferential arc portion 30b and the radius defining the outer
circumferential arc portion 30c are respectively largest at an angle of 0 degrees shown in FIG. 4A
to an angle of 90 degrees shown in FIG. 4G. , And continue in a single arc of the long side roll
portion 34 to the short side roll portion 35, respectively.
[0034]
As a result, in the corner roll portion 30 of the edge 3, as shown in FIG. 3, the center flat portion
30A, which is a plane defined corresponding to the center straight portion 30a, and the inner
peripheral straight portion 30d are defined. An inner peripheral upstanding wall portion 30D
which is a curved surface and an outer peripheral upstanding wall portion 30E which is a curved
surface defined corresponding to the outer peripheral straight line portion 30e (not shown
because it is hidden on the back side) are respectively formed. Further, in the corner roll portion
30 of the edge 3, it is a curved surface defined corresponding to the inner peripheral curved
surface portion 30B which is a curved surface defined corresponding to the inner peripheral arc
portion 30b and corresponding to the outer peripheral arc portion 30c. The outer peripheral
curved surface portion 30C is formed.
[0035]
As illustrated in FIG. 3, the central flat portion 30 </ b> A is a plane in which the width gradually
wides as it bends in the circumferential direction, and then the width narrows thereafter. The
inner circumferential wall 30D and the outer circumferential wall 30E are curved surfaces whose
widths gradually increase as they bend in the circumferential direction, and then the widths
become narrower, and do not include a portion that is spherical in appearance locally It is. On the
other hand, inner curved surface portion 30B and outer curved surface portion 30C are curved
surfaces whose width gradually narrows as they are curved in the circumferential direction, and
then their widths become wider, and portions which become spherical when viewed locally It is a
curved surface containing In the corner roll portion 30 of the edge 3, the central flat surface
portion 30A, the inner peripheral curved surface portion 30B, the outer peripheral curved
surface portion 30C, the inner peripheral upright wall portion 30D, and the outer peripheral
11-05-2019
14
upright wall portion 30E are smoothly continuous. .
[0036]
FIG. 5 is a view for explaining the change in the cross-sectional shape of the corner roll portion
40 of the edge 3x of the comparative example. The edge 3x of the comparative example is an
edge having a common material, specification, and dimensions, except that the cross-sectional
shape of the corner roll portion 40 is different from that of the corner roll portion 30 of the edge
3 in the previous embodiment. Therefore, in the following, the common parts are given the
common numbers, and the description is omitted.
[0037]
The supporting movable portion 33 of the edge 3x of the comparative example includes a long
side roll portion 34 including an arc having a single cross section corresponding to the long side,
and an arc including a single cross section corresponding to the short side A short side roll
portion 35 whose total height is equal to that of the long side roll portion 34, and a corner roll
portion 40 whose total height is equal to the total height of the long side roll portion and the
short side roll portion corresponding to the corners; Have. The long side roll portion 34 is a
convex roll whose cross sectional shape is defined from a single circular arc having a radius of
1.9 mm, the width Lw1 of which is about 3.5 mm, and the total height Lh 'of about 1.3. A planar
inner peripheral portion 31 and an outer peripheral portion 32 are connected to each other at a
long side so as to be 2 mm. Similarly, the short side roll portion 35 is a convex roll whose crosssectional shape is defined from a single arc having a radius of 1.8 mm, the width Lw2 is about
3.5 mm, and the total height Lh 'is The planar inner peripheral portion 31 and the outer
peripheral portion 32 are connected at the short side portion so as to be equal to the total height
Lh ′ of the long side roll portion 34.
[0038]
As illustrated in FIG. 5, the cross-sectional shape of the corner roll portion 40 of the edge 3 x of
the comparative example is defined from a single arc at the long side roll portion 34 in the case
of an angle of 0 degrees shown in FIG. And includes a convex roll at the short side roll portion 35
in the case of an angle of 90 degrees shown in FIG. 5 (g). The width Lw0 of the cross-sectional
shape of the corner roll portion 40 is the width Lw1 of the long side roll portion 34 at an angle
11-05-2019
15
of 0 degrees, and the angle even when the angle is 15 degrees to 75 degrees shown in FIGS. It is
equal to the width Lw2 of the short side roll portion 35 at 90 degrees.
[0039]
The four corner roll portions 40 of the edge 3x of the comparative example are continuous to the
inner circumferential end of the central linear portion 40a which is a straight line defining the
total height Lh 'and the inner peripheral end of the central linear portion 40a in the sectional
shape of each circumferential direction. It includes an inner circumferential arc portion 40b
which is an arc to be formed, and an outer circumferential arc portion 40c which is an arc
continuously formed on the outer circumferential end of the central straight portion 40a. The
central straight portion 30a is a straight line extending in a direction substantially orthogonal to
the direction in which the speaker diaphragm 2 and the voice coil assembly 4 vibrate. Therefore,
the maximum height of the support movable portion of the edge 3 is the entire height Lh
'throughout the entire circumference, and is substantially constant. Further, in the corner roll
portion 40, a straight portion corresponding to the inner peripheral straight portion 30d or the
outer peripheral straight portion 30e in the corner roll portion 30 of the edge 3 of the
embodiment is not formed in the cross sectional shape in the circumferential direction.
[0040]
The length of the central straight portion 40a of the corner roll portion 40 of the edge 3x of the
comparative example increases from the minimum to the maximum from the long side roll
portion 34 to the short side roll portion 35 and then decreases again to the minimum. Do. That
is, the length of the central linear portion 30a changes as the angle in the circumferential
direction changes, and becomes the longest near the angle of 45 degrees shown in FIG. 5 (d).
Specifically, the length of the central straight portion 30a changes in the range of 0 mm to about
1.6 mm.
[0041]
On the other hand, the radius defining the inner circumferential arc portion 40 b and the outer
circumferential arc portion 40 c in the sectional shape of the corner roll portion 40 of the edge 3
x of the comparative example is from the long side roll portion 34 to the short side roll portion
35 Decrease from maximum to minimum and then increase again to maximum. That is, the
11-05-2019
16
radius defining the inner circumferential arc portion 40b and the radius defining the outer
circumferential arc portion 40c are respectively smallest around the angle 45 degrees shown in
FIG. 5D, and each have a radius of 0.7 mm. It is. The radius defining the inner circumferential arc
portion 40b and the radius defining the outer circumferential arc portion 40c are respectively
largest at an angle of 0 degrees shown in FIG. 5A to an angle of 90 degrees shown in FIG. 5G. ,
And continue in a single arc of the long side roll portion 34 to the short side roll portion 35
respectively.
[0042]
As a result, in the corner roll portion 40 of the edge 3x of the comparative example, a central flat
portion 40A (not shown) which is a plane defined corresponding to the central linear portion 40a
is formed, and corresponds to the inner circumferential arc portion 40b. An inner peripheral
curved surface portion 40B (not shown) which is a curved surface which is defined and an outer
peripheral curved surface portion 40C which is a curved surface (not shown) which is specified
corresponding to the outer peripheral arc portion 40c are respectively formed. . However, in the
corner roll portion 40 of the edge 3x of the comparative example, like the corner roll portion 30
of the edge 3 of the embodiment illustrated in FIG. 3, the inner periphery is a curved surface
defined corresponding to the inner periphery straight line portion 30d. The standing wall portion
30D and the outer circumferential standing wall portion 30E which is a curved surface defined
corresponding to the outer circumferential straight portion 30e are not formed.
[0043]
The central flat portion 40A is a flat surface whose width gradually widens as it is bent in the
circumferential direction, and then the width becomes narrower, similarly to the central flat
portion 30A of the edge 3 in the embodiment shown in FIG. On the other hand, inner curved
surface portion 40B and outer curved surface portion 40C are curved surfaces whose width
gradually narrows as it is curved in the circumferential direction, and then the width becomes
wider, and a portion which becomes spherical when viewed locally It is a curved surface
containing In the corner roll portion 40 of the edge 3x, the central flat surface portion 40A, the
inner peripheral curved surface portion 40B, and the outer peripheral curved surface portion
40C are smoothly continuous.
[0044]
11-05-2019
17
Since the electrodynamic speaker 1 of the present embodiment includes the edge 3 described
above, the substantially rectangular speaker diaphragm 2 and the voice coil assembly 4, it is easy
to generate the elongated speaker diaphragm 2 at 300 Hz or more It is possible to realize smooth
frequency characteristics by suppressing the divided vibration of. In the edge 3 of this
embodiment, not only the central flat portion 30A which is flat and strong against stress but also
the inner circumferential wall portion 30D and the outer circumferential wall portion 30E are
formed in the corner roll portion 30 so as to further enhance the rigidity. Since the central
straight portion 30a defining the entire height, the inner circumferential straight portion 30d,
and the outer circumferential straight portion 30e are included in the cross sectional shape in the
circumferential direction, the overall rigidity of the angular roll portion 30 is enhanced, It is
possible to withstand excessive stress that tends to be concentrated on the corner roll unit 30 to
prevent edge breakage and suppress peak / dip of the reproduced sound pressure frequency
characteristic, and the reproduced sound of the electrodynamic speaker 1 using this edge It can
improve the quality.
[0045]
On the other hand, the electrodynamic speaker 1x (not shown) including the edge 3x of the
comparative example is further rigid although the edge 3x includes the flat central strong plane
portion 40A in the corner roll portion 40 as described above Since the portions corresponding to
the inner circumferential standing wall portion 30D and the outer circumferential standing wall
portion 30E in the present embodiment are not formed in this embodiment, it is not sufficient to
enhance the rigidity of the corner roll portion 40 so as to withstand excessive stress which tends
to concentrate. . As a result, in the corner roll unit 40 of the edge 3 x, edge breakage may occur,
and peak-dip tends to occur also in the reproduced sound pressure frequency characteristic.
[0046]
Therefore, the electrodynamic speaker 1 of the present embodiment makes the shape of the
elongated edge 3 as described above, so that relatively flat reproduction is achieved even if the
substantially rectangular speaker diaphragm 2 is used. Sound pressure frequency characteristics
can be obtained. That is, the sectional shape of the corner roll portion 30 of the edge 3 is a
curved surface defined corresponding to the inner circumferential wall portion 30D, which is a
curved surface defined corresponding to the inner circumferential linear portion 30d, and the
outer peripheral straight portion 30e. Since the outer circumferential standing wall portion 30E
is formed to be gradually changed, the overall rigidity of the angular roll portion 30 can be
11-05-2019
18
enhanced to withstand excessive stress that tends to be concentrated on the angular roll portion
30. Thus, it is possible to prevent the edge breakage and to suppress the peak dip of the
reproduced sound pressure frequency characteristic, and to improve the reproduced sound
quality of the electrodynamic speaker 1 using this edge.
[0047]
The edge 3 constituting the electrodynamic speaker according to the present invention is not
limited to the up roll edge in which the support movable portion 33 is convex in the forward
direction (concave in the backward direction) as in the above embodiment. The movable portion
33 may be a down roll edge that is concave in the forward direction (convex in the backward
direction). Moreover, the edge 3 which comprises the electrodynamic-type speaker of this
invention is not limited to the case of the said Example, The case where it shape | molds from
foam rubber, or when materials, such as urethane foam, may be used. The elastic material
forming the speaker edge may be molded by, for example, injecting rubber or an elastomer into
an injection mold. Further, the sheet of elastomer may be press-molded.
[0048]
The electrodynamic speaker according to the present invention is not limited to a speaker using a
substantially rectangular speaker diaphragm, but an elongated diaphragm emitting a sound wave
and a drive member transmitting a driving force to the elongated diaphragm are elongated. The
invention is also applicable to other electro-mechanical-acoustic transducers with other vibration
systems that are combinations of shapes.
[0049]
Reference Signs List 1 electrodynamic speaker 2 speaker diaphragm 3 edge 4 voice coil assembly
5 gasket 6 frame 10 magnetic circuit 30, 40 square roll portion 31 inner circumferential portion
32 outer circumferential portion 33 support movable portion 34 long side roll portion 35 short
side roll portion
11-05-2019
19
Документ
Категория
Без категории
Просмотров
0
Размер файла
34 Кб
Теги
jp2011239125
1/--страниц
Пожаловаться на содержимое документа