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JP2011223559

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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
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DESCRIPTION JP2011223559
An object of the present invention is to provide a speaker with excellent sound quality, which is
an elongated structure and in which split resonance does not easily occur and flat frequency
characteristics can be obtained. SOLUTION: A diaphragm 11 constituted by a long flat plate, an
edge 12 which is disposed at an end of the diaphragm 11 in the longitudinal direction and
supports the diaphragm 11 in a vibratable manner, and a vibration amplitude of the diaphragm
11 In order to support the diaphragm 11 and to transmit the vibration to the diaphragm 11, the
opening 11 is directly connected to the diaphragm 11, and the peripheral edge of the opening is
directly connected to the diaphragm 11. And at least one voice coil bobbin 14, a voice coil 15
wound around an outer periphery of a substantially central portion in the height direction of the
voice coil bobbin 14, and a magnetic circuit 21 for driving the voice coil 15. [Selected figure]
Figure 1
Speaker and electronic device equipped with the same
[0001]
The present invention relates to a speaker and an electronic device provided with the same, and
more particularly to a speaker for achieving slimming and thinning and an electronic device
provided with the same.
[0002]
2. Description of the Related Art In recent years, with the spread of high vision and wide vision
televisions, etc., the screen of a television is becoming generally wide and large.
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1
On the other hand, narrow and thin television sets as a whole are desired from the housing
situation in Japan.
[0003]
A speaker unit for a television (hereinafter referred to as a speaker) is usually attached to both
sides of the display surface of the television such as a cathode ray tube, which contributes to
increasing the width of the television set. Therefore, conventionally, a speaker having a slender
structure such as a square or an oval has been used as a speaker for a television (for example,
Patent Document 1). In addition, the width of the speaker is required to be increasingly narrow
due to the widening of the display surface of a television, such as a cathode ray tube, and the
speaker is also required to have a high sound quality corresponding to the high image quality of
the display screen. There is. In addition, since flat-screen TVs using plasma displays and liquid
crystal displays are increasing, thinner speakers are further required.
[0004]
Hereinafter, a conventional elongated (slim) speaker disclosed in Patent Document 1 will be
described with reference to the drawings. 24A to 24C show the structure of a conventional slim
speaker. FIG. 24A shows a plan view of a conventional slim type speaker, FIG. 24B shows a crosssectional view in the longitudinal direction (C-C ′) of the conventional slim type speaker, and
FIG. 24C shows a short side direction (O- Fig. 2 shows a cross-sectional view of O ').
[0005]
The slim speaker shown in FIGS. 24A to 24C includes a magnet 801, a plate 802, a yoke 803, a
frame 804, a voice coil bobbin 805, a voice coil 806, a damper 807, a diaphragm 809, a dust cap
810, and an edge 811. . Further, in the slim speaker, a magnetic gap 808 is formed by the
magnet 801, the plate 802 and the yoke 803.
[0006]
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The voice coil 806 is composed of a winding of a conductor such as copper or aluminum. The
voice coil 806 is fixed to a cylindrical voice coil bobbin 805. In other words, the voice coil 806 is
supported by the voice coil bobbin 805 so as to be suspended in the magnetic gap 808.
[0007]
The voice coil bobbin 805 is connected to the frame 804 via the damper 807. The voice coil
bobbin 805 is bonded to the diaphragm 809 on the side opposite to the side to which the voice
coil 806 is fixed.
[0008]
The vibrating plate 809 has an elliptical or substantially elliptical shape, and a dust cap 810
having a substantially semicircular cross section is fixed to the central portion of the vibrating
plate 809.
[0009]
The edge 811 has an annular shape and a semicircular cross section, and the inner peripheral
portion of the edge 811 is fixed to the outer peripheral portion of the diaphragm 809.
Also, the outer peripheral portion of the edge 811 is fixed to the frame 804.
[0010]
Next, the case of driving the speakers shown in FIGS. 24A to 24C configured as described above
will be described. That is, first, current is applied to the voice coil 806. Then, the voice coil
bobbin 805 performs a piston motion by the drive current applied to the voice coil 806 and the
magnetic field around the voice coil 806. Thereby, the diaphragm 809 vibrates in the direction of
the piston movement, and as a result, a sound wave is emitted from the diaphragm 809.
[0011]
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FIG. 25 is a diagram showing frequency characteristics regarding the reproduction sound
pressure level of the speaker described in Patent Document 1. As shown in FIG. In FIG. 25, the
vertical axis represents the reproduced sound pressure level when a power of 1 W is input to this
speaker, and the horizontal axis represents the driving frequency. Also, the reproduction sound
pressure level is measured by disposing a microphone at a position on the center axis of the
speaker and 1 m away from the speaker on the front side.
[0012]
Unexamined-Japanese-Patent No. 2004-32659
[0013]
However, the above-described conventional speaker has the following problems.
That is, in the speakers shown in FIGS. 24A to 24C, since the driving method is to drive the
central portion of the elongated diaphragm 809, split resonance is likely to occur in the
longitudinal direction, and as a result, the frequency characteristics regarding the reproduced
sound pressure level Show characteristics that cause peak dips in the mid-high range. That is, in
the above-described conventional speaker, split resonance occurs in the longitudinal direction,
which causes deterioration in sound quality. As shown in FIG. 25, this is a noticeable dip around
the drive frequency 2 kHz (position A in the figure), drive frequency 3 kHz (position B in the
figure) and drive frequency 5 kHz (position C in the figure). It can also be understood from the
fact that (peak dip) is observed.
[0014]
The present invention has been made in view of such conventional problems, and is a speaker
having excellent sound quality in which split resonance hardly occurs even with a long structure,
and flat frequency characteristics can be obtained. It aims at providing an electronic device
provided.
[0015]
In order to achieve the above object, the speaker according to the first aspect of the present
invention includes a diaphragm formed of a long flat plate and a longitudinal end of the
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diaphragm, which can vibrate the diaphragm. And the peripheral portion of the opening is
directly connected to the diaphragm, and the diaphragm is supported. And driving at least one
voice coil bobbin for transmitting vibration to the diaphragm, a voice coil wound on an outer
periphery of a substantially central portion in a height direction of the voice coil bobbin, and the
voice coil And a magnetic circuit for
[0016]
According to this configuration, since the edge is not configured in the short direction of the
diaphragm, a very long and thin speaker can be configured.
As a result, it is possible to realize a speaker with excellent sound quality in which split resonance
is unlikely to occur even in the elongated structure, and flat frequency characteristics can be
obtained.
[0017]
In the speaker according to the second aspect, the magnetic circuit is an internal magnetic type
magnetic circuit, and a yoke having a recess at a central portion, a magnet disposed on the
bottom of the recess of the yoke, and the yoke A rectangular plate disposed in the recess and
fixed to the upper surface of the magnet, a through hole penetrating the center of the plate, the
magnet and the yoke, an inner wall of the voice coil bobbin, and an outer peripheral surface of
the plate And a magnetic fluid, which is a liquid having magnetic attraction, disposed so as to
close the magnetic gap inner portion, the magnetic fluid comprising the diaphragm and the voice
coil bobbin. In the enclosed space, the passage of the sound generated by the diaphragm other
than the through hole may be blocked.
[0018]
According to this configuration, even when the speaker reproduces a sound, the voice coil bobbin
can maintain air shutoff without popping out from the inner side of the magnetic gap, and it is
possible to prevent the magnetic fluid from being scraped out due to the separation and reentry
movement. be able to.
That is, the speaker can maintain a stable state without the magnetic fluid being scattered,
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regardless of the state of vibration of the diaphragm.
[0019]
Further, as the speaker in the third aspect, the yoke is formed in a concave shape in a cross
section in the short direction, and a side facing the side in the longitudinal direction of the plate
is substantially circular when viewed from the back direction of the speaker. An arc, wherein the
width in the short direction of the central portion in the longitudinal direction is wider than the
width in the short direction of the end in the longitudinal direction, and the yoke has the plate in
the back direction of the speaker. The magnetic gap including the inner side of the magnetic gap
may be formed by the side in the longitudinal direction and the opposite side.
[0020]
With this configuration, it is possible to prevent the efficiency from being reduced by the
magnetic circuit corresponding to the voice coil bobbin shape change due to the pressure of the
magnetic fluid.
[0021]
Further, as the speaker in the fourth aspect, the magnetic circuit is an external magnetic type
magnetic circuit, and is an inverted T-shaped yoke having a center pole, a magnet disposed
outside the center pole, and A magnetic gap between a plate disposed outside the center pole and
fixed to the top surface of the magnet, a through hole penetrating the center of the center pole,
an inner wall of the voice coil bobbin and an outer peripheral surface of the center pole An inner
portion, and a magnetic fluid which is a magnetic adsorptive liquid which is disposed so as to
close an inner portion of the magnetic gap, the magnetic fluid in a space surrounded by the
diaphragm and the voice coil bobbin; The passage of the sound generated by the diaphragm
other than the through hole may be blocked.
[0022]
According to this configuration, even when the speaker reproduces a sound, the voice coil bobbin
can maintain air shutoff without popping out from the inner side of the magnetic gap, and it is
possible to prevent the magnetic fluid from being scraped out due to the separation and reentry
movement. be able to.
That is, the speaker can maintain a stable state without the magnetic fluid being scattered,
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regardless of the state of vibration of the diaphragm.
[0023]
Further, as a speaker according to a fifth aspect, in the plate, the side in the longitudinal direction
opposite to the center pole is substantially arc-shaped when viewed from the back direction of
the speaker, and the central portion of the side in the longitudinal direction is an end It may be
wider than.
[0024]
With this configuration, it is possible to prevent the efficiency from being reduced by the
magnetic circuit corresponding to the voice coil bobbin shape change due to the pressure of the
magnetic fluid.
[0025]
Further, as the speaker in the sixth aspect, the diaphragm may have a substantially planar shape,
and a plurality of reinforcing ribs formed of concavities and convexities continuous on a surface
in the longitudinal direction of the diaphragm may be provided.
[0026]
According to this configuration, it is possible to suppress the resonance by increasing the rigidity
in the short direction of the diaphragm.
[0027]
In the seventh aspect, as the speaker, the edge is formed in a roll shape, and the top of the roll is
formed thinner than the base of the roll, and is formed so as to be thicker from the top of the roll
to the base of the roll It may be
[0028]
Further, as a speaker in an eighth aspect, when the length in the longitudinal direction is 1, the
diaphragm may be formed to have a length of 0.5 or less.
[0029]
In the ninth aspect, as the speaker, the speaker is connected to a connecting member having one
end fixed to the diaphragm vertically, and one end connected to the other end of the connecting
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member, The voice coil may be supported on the frame by the connecting member and the
damper through the diaphragm.
[0030]
A stable support structure with dampers and edges can be provided to prevent the occurrence of
rolling at large amplitudes.
[0031]
In the speaker according to the tenth aspect, the connecting member may be connected to the
diaphragm and the one end of the damper through the through hole.
[0032]
In addition, in order to achieve the above object, an electronic device in an eleventh aspect of the
present invention includes the speaker according to any one of the first to tenth aspects.
[0033]
According to the present invention, it is possible to realize a speaker with excellent sound quality
and an electronic device equipped with the same, which is an elongated structure and in which
split resonance hardly occurs and flat frequency characteristics can be obtained.
[0034]
FIG. 1 is a diagram showing a configuration of a loudspeaker according to a first embodiment of
the present invention.
FIG. 2 is a diagram showing the configuration of the loudspeaker according to the first
embodiment of the present invention.
FIG. 3 is a diagram showing the configuration of the loudspeaker according to the first
embodiment of the present invention.
FIG. 4 is a diagram showing the configuration of the speaker according to the first embodiment
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of the present invention.
FIG. 5 is a view showing a voice coil bobbin constituting the speaker according to Embodiment 1
of the present invention.
FIG. 6 is a diagram showing a voice coil constituting the speaker according to the first
embodiment of the present invention.
FIG. 7 is a view showing a speaker diaphragm which constitutes the speaker according to
Embodiment 1 of the present invention.
FIG. 8 is a diagram showing a magnetic circuit that constitutes the speaker according to the first
embodiment of the present invention.
FIG. 9 is a view showing an example of a diaphragm constituting the speaker according to
Embodiment 1 of the present invention.
FIG. 10 is a diagram showing a configuration of a speaker in a modification of the first
embodiment of the present invention.
FIG. 11 is a diagram showing a configuration of a speaker in a modification of the first
embodiment of the present invention.
FIG. 12 is a diagram showing a configuration of a speaker in a modification of the first
embodiment of the present invention.
FIG. 13 is a diagram showing a configuration of a speaker in a modification of the first
embodiment of the present invention.
FIG. 14 is a diagram showing the configuration of the speaker in the second embodiment of the
present invention.
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FIG. 15 is a diagram showing the configuration of the speaker in the second embodiment of the
present invention. FIG. 16 is a diagram showing the configuration of the speaker in the second
embodiment of the present invention. FIG. 17 is a diagram showing components constituting a
speaker in the second embodiment of the present invention. FIG. 18 is a diagram showing
components that constitute the speaker in the second embodiment of the present invention. FIG.
19 is a diagram showing a configuration of a speaker in a modification of the second
embodiment of the present invention. FIG. 20 is a perspective view showing a magnetic circuit
constituting the speaker of the third embodiment. FIG. 21 is a plan view showing a magnetic
circuit constituting the speaker of the third embodiment. FIG. 22 is a plan view showing the yoke
34 constituting the speaker of the third embodiment. FIG. 23 is a view showing an example of a
display device using the speaker of the present invention. FIG. 24A is a view showing the
structure of a conventional slim speaker. FIG. 24B is a view showing the structure of a
conventional slim speaker. FIG. 24C is a view showing the structure of a conventional slim
speaker. FIG. 25 is a diagram showing frequency characteristics regarding the reproduction
sound pressure level of the speaker described in Patent Document 1. As shown in FIG.
[0035]
First Embodiment A loudspeaker according to a first embodiment of the present invention will be
described below. In FIG. 1 to FIG. 22, the same reference numerals are given to components
having the same functions, and the description thereof is omitted.
[0036]
1 to 4 are diagrams showing the configuration of the speaker in the first embodiment of the
present invention. FIG. 1 shows a perspective view of the speaker according to the present
embodiment as viewed from the back (also referred to as the back). FIG. 2 is a perspective view
of the speaker according to the present embodiment as viewed from the front side (also referred
to as the front direction). FIG. 3 shows an A-a sectional view of the speaker shown in FIG. 1, and
FIG. 4 shows a B-b sectional view of the speaker shown in FIG. Moreover, FIGS. 5-8 is a figure
which shows the components which comprise the speaker shown in FIG. 1, respectively. FIG. 5
shows a voice coil bobbin, FIG. 6 shows a voice coil, FIG. 7 shows a diaphragm, and FIG. 8 shows
a magnetic circuit.
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[0037]
The speaker 1 shown in FIGS. 1 to 4 includes a diaphragm 11, a roll edge 12, a frame 13, a voice
coil bobbin 14, a voice coil 15, a magnetic circuit 21 having a plate 16, a magnet 17, and a yoke
18. Have. The speaker 1 is configured in a long shape in which the lengths in the longitudinal
direction (longitudinal direction) and the lateral direction (short direction) are different. For
example, the speaker 1 is configured to have an elongated shape in which the longitudinal
direction (longitudinal direction) is twice or more as long as that in the lateral direction (short
direction). The speaker 1 emits a sound from the front direction shown in FIGS.
[0038]
Hereinafter, the entire configuration of the speaker will be described with reference to FIGS. 1 to
8.
[0039]
The diaphragm 11 is a flat diaphragm configured of a long flat plate.
Moreover, the diaphragm 11 is comprised by thin sheet materials, such as paper, aluminum, or a
polyimide. For example, the diaphragm 11 has an elongated shape in which the length in the
longitudinal direction (longitudinal direction) and the lateral direction (short side direction) are
different, and the ratio of the length in the longitudinal direction (longitudinal direction) to the
lateral (short side direction) Is 2: 1 or more. The roll edge 12 is fixed to both ends in the
longitudinal direction of the diaphragm 11. On the other hand, the roll edge 12 or the like is not
fixed to both ends in the short direction of the diaphragm 11. With this configuration, the
diaphragm 11 is vibratably supported by the roll edge 12. Further, since the roll edge 12 is not
arranged in the short direction, the roll width of the roll edge 12 is not necessary. That is, the
speaker 1 can be configured to be thin and slim as much as the roll edge 12 is not disposed.
Further, in the diaphragm 11, the voice coil bobbin 14 is fixed to the whole of the outer
peripheral portion 11a on the front side (front direction). With these configurations, the driving
force is applied to the diaphragm 11 in the entire longitudinal direction. In the diaphragm 11, as
shown in FIG. 3, the outer peripheral portion 11a is preferably formed in a U-shape. By doing so,
the fixation with the voice coil bobbin 14 becomes firmer.
[0040]
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11
The voice coil bobbin 14 is formed in a substantially rectangular tube shape having a height
twice or more the vibration amplitude of the diaphragm 11, and the opening peripheral edge is
directly connected to the diaphragm 11. The voice coil bobbin 14 supports the diaphragm 11
and transmits vibration to the diaphragm 11.
[0041]
Specifically, as shown in FIG. 5, the voice coil bobbin 14 has a height h which is twice or more of
the maximum amplitude of the diaphragm 11 and has a long shape in which the surface in the
longitudinal direction is opened. It is comprised by a substantially square tube shape. The voice
coil bobbin 14 is made of, for example, a polymer film such as polyimide or a thin sheet material
of aluminum. Further, in the voice coil bobbin 14, the voice coil 15 is wound at the center
position (around h / 2) in the height direction. Further, as shown in FIGS. 3 and 4, the voice coil
bobbin 14 has the diaphragm 11 fixed to one end (the periphery of the opening), supports the
diaphragm 11, and transmits the vibration to the diaphragm 11.
[0042]
The voice coil 15 is wound around the outer periphery of a substantially central portion in the
height direction of the voice coil bobbin 14. Specifically, the voice coil 15 plays the role of
converting voice current into vibration, and as shown in FIG. 6, the voice coil 15 is wound at a
central position in the height direction of the voice coil bobbin 14. The voice coil 15 is made of,
for example, a wire made of copper or aluminum.
[0043]
The roll edge 12 is an edge which is disposed at the longitudinal end of the diaphragm 11 and
vibratably supports the diaphragm 11. Specifically, as shown in FIGS. 1 and 3, the roll edge 12 is
configured in a roll shape having a semicircular cross section. One end of the roll edge 12 is fixed
to the end of the diaphragm 11 in the longitudinal direction, and the other end is fixed to the
frame 13 so that the voice coil 15 can vibrate (the diaphragm 11 vibrates) The diaphragm 11 is
supported so as to be possible.
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12
[0044]
Here, the edge material of the roll edge 12 and the cross-sectional thickness shape will be
described. The roll edge 12 is preferably formed by injection molding using a foamed rubber
material, a solid rubber, or a polymer material as a material. If the roll edge 12 is made of these
materials, its thickness can be varied freely, so it is desirable that the roll edge 12 be configured
to thin the top of the roll and thicken the base. In other words, the roll edge 12 is configured in a
roll shape, and the top of the roll is preferably formed thinner than the base of the roll and is
formed to be thicker from the top of the roll to the base of the roll. When the roll edge 12 is
formed in this way, the top portion is deformed in a state where the amplitude of the diaphragm
11 is small, so it moves softly, and when the amplitude of the diaphragm 11 is large, it gradually
becomes hard due to the deformation of the base. The reason is that the That is, even at the
maximum amplitude of the diaphragm 11, it is possible to realize an excellent support system
capable of realizing a desired operation (maximum amplitude operation) on the diaphragm 11
without the roll edge 12 rapidly pinching the diaphragm 11 It is from.
[0045]
The magnetic circuit 21 is a circuit for driving the voice coil 15. In other words, the magnetic
circuit 21 generates a driving force for driving the voice coil 15. The magnetic circuit 21 is
formed in an elongated shape (here, elongated shape) having a similar shape to the voice coil 15,
and as shown in FIGS. 4 and 8, the plate 16, the magnet 17, the yoke 18, the through hole 19,
and the magnetic There is a gap 22. Further, as shown in FIG. 4 and FIG. 8, the magnetic circuit
21 is an internal magnet type magnetic circuit in which the magnet 17 is formed inside the yoke
18.
[0046]
The yoke 18 is a component for bonding (fixing) the magnet, and is configured such that the
cross section in the short direction is substantially U-shaped, that is, has a recess in the central
portion. The magnet 17 is fixed (disposed) to the bottom of the recess of the yoke 18. The plate
16 has a rectangular parallelepiped shape, and is fixed (disposed) on the upper surface of the
magnet 17 in the recess of the yoke 18.
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[0047]
The through hole 19 is provided to penetrate through the central portion of the plate 16, the
magnet 17 and the yoke 18. The through hole 19 functions to guide the sound generated by the
diaphragm 11 to the surface (front direction) of the speaker.
[0048]
The magnetic gap 22 is a gap (a gap) between the plate 16 including the magnetic gap inner
portion which is a gap (a gap) between the plate 16 and the recess inner wall of the yoke 18 and
the yoke 18 and generates magnetic flux concentratedly. This is a gap (interval) for Further, since
the magnetic gap 22 is formed in a similar shape to the voice coil 15, as shown in FIG. 8, when
viewed from the rear side, it has two long linear shapes in the longitudinal direction.
[0049]
The magnetic gap inner portion is a gap (interval) between the inner wall of the voice coil bobbin
14 and the outside of the plate 16. Then, the magnetic fluid 20 which is attracted by the
magnetic force is filled in the magnetic gap inner portion, thereby blocking the sound generated
by the diaphragm 11 between the inner side and the outer side.
[0050]
The magnetic fluid 20 is a liquid having magnetic adsorptivity, which is a characteristic of being
attracted by magnetic force, and is filled (arranged) so as to close the inner portion of the
magnetic gap. Thereby, in the space surrounded by the diaphragm 11 and the inner wall of the
voice coil bobbin 14, the magnetic fluid 20 blocks the passage of the sound generated by the
diaphragm 11 other than the through holes 19. That is, the sound generated by the diaphragm
11 is blocked on the inside and the outside.
[0051]
The speaker 1 is configured as described above.
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14
[0052]
Next, the effects of the speaker 1 configured as described above will be described.
[0053]
First, the vibration system of the speaker 1 will be described.
That is, a current is applied to the voice coil 15.
Then, in the voice coil 15, a driving force is generated by the applied current and the magnetic
field of the magnetic circuit 21, and the diaphragm 11 is vibrated through the voice coil bobbin
14. That is, the voice coil 15 vibrates the diaphragm 11 by the generated driving force, and the
sound generated by the vibration of the diaphragm 11 is radiated to the space.
[0054]
Here, in general, when a flat diaphragm made of a thin sheet is centrally driven at only one point,
a large number of resonances are induced, and the sound pressure frequency characteristic
becomes a characteristic having many peaks and dips. In particular, in the case where the flat
diaphragm has an elongated shape and is made of a thin film material, many resonances occur in
the longitudinal direction from a low frequency.
[0055]
On the other hand, in the present invention, since the voice coil bobbin 14 is fixed to the entire
outer peripheral portion of the diaphragm 11, a driving force is applied to the entire longitudinal
direction. For this reason, it is possible to suppress all the resonance modes in the longitudinal
direction.
[0056]
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15
Further, the short direction of the diaphragm 11 is half or less in length with respect to the
longitudinal direction. Therefore, the resonance frequency is higher than that in the longitudinal
direction. As described above, by driving the entire surface in the longitudinal direction in the
very long and thin diaphragm 11, the use band can be expanded to a high frequency.
[0057]
Next, the support system of the speaker 1 will be described.
[0058]
First, an effect achieved by the speaker 1 including the roll edge 12 will be described.
[0059]
Generally, the role of the edge is to support the diaphragm so that it can oscillate in a piston and
to block air before and after the diaphragm.
[0060]
In the speaker 1, as described above, the roll edge 12 is fixed only to the end in the longitudinal
direction of the diaphragm 11.
That is, the roll edge 12 is disposed (fixed) at both ends in the longitudinal direction of the
diaphragm 11, and supports the diaphragm 11 so as to be capable of vibrating.
[0061]
With this configuration, in the speaker 1, the stiffness can be reduced as compared to the case of
a general speaker in which the entire circumference of the diaphragm is supported by the edge.
The reason why the stiffness is increased when the entire periphery of the diaphragm is
supported by an edge is as follows.
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16
That is, this is because the stiffness is in proportion to the edge circumferential length and the
circumferential length differs between the inside and the outside of the edge at the corner
portion of the diaphragm. That is, if the edges have different circumferential lengths, the
diaphragm needs to operate with material contraction during piston vibration, and the
contraction operation requires a large amount of force, resulting in high stiffness.
[0062]
As described above, in the speaker according to the first embodiment, since the edge
circumferential length is short, and there is no difference in circumferential length between the
inner periphery and the outer periphery because they are not connected along the entire
periphery, the stiffness can be reduced. That is, by providing the roll edge 12 in the speaker 1,
the lowest resonance frequency of the speaker 1 can be reduced.
[0063]
Then, even if the speaker 1 is provided with the roll edge 12, it will be described that the air
around the diaphragm 11, which is another role of the edge, can be shut off.
[0064]
In the speaker 1, as described above, the magnetic fluid 20 is filled in the gap (inner portion of
the magnetic gap) between the inner side (inner wall) of the voice coil bobbin 14 and the outer
periphery of the plate 16.
The magnetic fluid 20 works to prevent the voice coil 15 and the magnetic circuit 21 from
coming in contact with each other. The magnetic fluid 20 also blocks the sound generated by the
diaphragm 11 between the inside and the outside.
[0065]
That is, in the speaker 1, since the roll edge 12 is configured as described above, it is not
necessary to dispose the roll edge 12 around the entire circumference of the diaphragm 11 to
block the air before and after the diaphragm 11.
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17
[0066]
Therefore, in the speaker 1 of the present invention, by providing the magnetic fluid 20 as
described above, the effect of blocking the air before and after the diaphragm 11 can be
exhibited, and the stiffness is reduced by providing the roll edge 12. Can.
Thereby, the speaker 1 can obtain excellent bass reproduction characteristics.
[0067]
Next, the relationship between the height of the voice coil bobbin 14 and the vibration amplitude
will be described.
[0068]
In the speaker 1, the height h of the voice coil bobbin 14 is twice or more the maximum vibration
amplitude (maximum amplitude) of the diaphragm 11.
The vibration amplitude changes according to the frequency of the sound to be reproduced.
[0069]
For example, assuming that the speaker 1 is a speaker equivalent to an aperture of 8 cm, and can
cope with the low band 100 Hz and the maximum sound pressure level of 87 dB / m, the
maximum amplitude of the diaphragm 11 is + -4 mm. In this case, the voice coil bobbin 14 is
configured to have a height h of 8 mm or more. The voice coil bobbin 14 is preferably configured
to have a height h of 10 mm in consideration of the normal amplitude margin in the diaphragm
11.
[0070]
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18
In practice, the maximum amplitude of the diaphragm 11 is determined by the component (roll
edge 12) that constitutes the speaker 1. Therefore, the maximum amplitude of the diaphragm 11
is set from the physical limit value of the components constituting the speaker 1.
[0071]
Specifically, the diaphragm 11 may determine its maximum amplitude based on the state in
which the roll edge 12 is extended. That is, in the speaker 1, the maximum amplitude of the
diaphragm 11 corresponds to the position where the roll edge 12 is linear if the expansion and
contraction of the material is ignored.
[0072]
The roll edge 12 is a roll-shaped edge having a substantially semicircular cross section attached
across the frame 13 and the diaphragm 11. The roll edge 12 supports the diaphragm 11 so that
the diaphragm 11 can perform stable piston vibration while changing its shape according to the
vibration amplitude. Then, at the roll edge 12, the state in which the roll is extended linearly is
the maximum value of the vibration amplitude of the diaphragm 11.
[0073]
For example, it is assumed that the roll shape of the roll edge 12 is semicircular. In this case, in a
state in which the roll shape extends in a straight line, a right triangle whose edge
circumferential length of the roll edge 12 is the oblique side, the distance between the frame 13
and the diaphragm 11 is the bottom side, and the maximum amplitude distance of the diaphragm
11 is the height It can be considered to form. Thus, it can be seen that the maximum amplitude
distance of the diaphragm 11 is 2.4 times the roll radius. Therefore, in view of the above
calculation, the height h of the voice coil bobbin 14 may be 4.8 times or more of the roll radius of
the roll edge 12.
[0074]
On the contrary, as a design value, the maximum amplitude of the diaphragm 11 may be ± 4
11-05-2019
19
mm. In that case, from the above calculation method, it can be calculated that the radius of the
roll of the roll edge 12 is 1.7 mm, and the distance between the frame 13 and the diaphragm 11
is 3.4 mm.
[0075]
As described above, in the speaker 1 of the present invention, only the roll edges 12 are disposed
at both ends in the longitudinal direction of the diaphragm 11, and the roll edges 12 are not
disposed in the short direction. Therefore, the speaker 1 has an effect that the speaker 1 can be
configured to be thin and slim as much as the roll edge 12 is not disposed in the short direction.
Specifically, when the edge width is set to 3.4 mm with a speaker equivalent to 8 cm aperture,
the speaker width in the width direction of 10.8 mm in total is reduced by 3.4 * 2 + edge pasted
parts (2 mm * 2). An effect of being able to be configured is exhibited.
[0076]
Next, the effects based on the configurations of the magnetic fluid 20 and the voice coil bobbin
14 will be described.
[0077]
As described above, the voice coil bobbin 14 has a height at least twice the maximum amplitude
of the diaphragm 11, and the voice coil 15 generating a driving force is wound at the center in
the height direction.
Further, the magnetic gap inner portion which is a gap (interval) between the inner side (inner
wall) of the voice coil bobbin 14 and the outer side of the plate 16 is filled with the magnetic
fluid 20 attracted by the magnetic force.
[0078]
With these configurations, the voice coil bobbin 14 does not fly out of the region of the magnetic
gap inner portion of the magnetic circuit 21 when the speaker 1 reproduces a sound. In other
words, the voice coil bobbin 14 does not protrude from between the outer periphery of the plate
11-05-2019
20
16 and the inner surface of the recess of the yoke 18. Therefore, since the magnetic fluid 20 and
the voice coil bobbin 14 are not separated, the voice coil bobbin 14 vibrates while maintaining
the wettability by the magnetic fluid 20 and the surface tension. When the magnetic fluid 20 and
the voice coil bobbin 14 are separated, there is a possibility that the magnetic fluid 20 may be reentered so as to tear the magnetic fluid 20 apart and the magnetic fluid 20 may be scattered.
However, in this configuration, the operation of separation and re-entry is not performed.
[0079]
Thus, the magnetic fluid 20 remains inside the voice coil bobbin 14 without being separated
from the plate 16. As a result, the air blocking effect before and after the diaphragm 11 can be
maintained.
[0080]
Further, in the speaker 1, the voice coil bobbin 14 contacts the plate 16 by providing the roll
edge 12 which is disposed (fixed) to both end portions in the longitudinal direction of the
diaphragm 11 and supports the diaphragm 11 so as to be able to vibrate. To prevent.
[0081]
Further, as described above, since the voice coil 15 is wound around the outside of the voice coil
bobbin 14, the inner dimension of the voice coil bobbin 14 can be maintained substantially
uniform.
For this reason, the contact state between the inside of the voice coil bobbin 14 and the magnetic
fluid 20 can be maintained stable regardless of the vibration state of the diaphragm 11.
[0082]
As described above, according to the first embodiment, it is possible to realize the speaker 1 with
excellent sound quality in which split resonance does not easily occur even with the elongated
structure and flat frequency characteristics can be obtained.
[0083]
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21
Specifically, since the edge is not formed in the direction of the short side of the diaphragm 11,
the very elongated speaker 1 can be formed.
More specifically, the voice coil bobbin 14 having twice or more the vibration amplitude of the
diaphragm 11 is configured, and the voice coil 15 is disposed at the center in the height direction
of the voice coil bobbin 14 and the height direction of the voice coil bobbin 14 The diaphragm
11 is disposed at one end of the sensor. As a result, it is possible to realize the speaker 1 with
excellent sound quality in which split resonance hardly occurs even in the elongated structure,
and flat frequency characteristics can be obtained.
[0084]
Further, in the speaker 1 of the present embodiment, the magnetic fluid 20 is provided in the
magnetic gap inner portion formed in the gap (interval) between the voice coil bobbin 14 and the
plate 16. With this configuration, the voice coil bobbin does not jump out of the region of the
magnetic gap inner portion when the speaker 1 reproduces the sound, and the air blocking is
maintained, and the scraping of the magnetic fluid 20 accompanying the separation and reentry
movement is prevented. Can. That is, the speaker 1 can maintain the stable state without the
magnetic fluid 20 being scattered, regardless of the state of the vibration of the diaphragm 11.
[0085]
Thus, a stable support structure and an air blocking effect before and after the diaphragm 11 can
be realized without arranging the roll edge 12 as the edge on the entire periphery of the
diaphragm 11. And since the shape of the speaker 1 can be shortened because the roll edge 12 is
not installed in the short direction, the slim speaker 1 can be realized.
[0086]
In the first embodiment, the diaphragm 11 is described as a flat diaphragm configured of a long
flat plate, but the present invention is not limited thereto. For example, as shown in FIG. 9, it is
good also as diaphragm 11A which provided the reinforcing rib 23 of uneven structure. In other
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22
words, the diaphragm 11A may have a substantially planar shape, and a plurality of reinforcing
ribs formed of asperities continuous on the surface in the longitudinal direction of the diaphragm
11A may be provided. Here, FIG. 9 is a view showing an example of a diaphragm which
constitutes the speaker according to Embodiment 1 of the present invention. As described above,
by providing the reinforcing rib 23 on the diaphragm 11A, the resonance frequency in the short
direction can be further increased, and even higher frequency sound can be reproduced without
distortion.
[0087]
In the first embodiment, the magnetic circuit 21 is described as an internal magnet type
magnetic circuit in which the magnet 17 is formed on the inside of the yoke 18. However, the
present invention is not limited thereto. Of course, it may be an external magnet type magnetic
circuit. Hereinafter, the case will be described as a modified example with reference to the
drawings.
[0088]
10 to 13 are diagrams showing the configuration of the speaker in a modification of the first
embodiment of the present invention. FIG. 10 is a perspective view of the speaker according to
the modification of the present embodiment as viewed from the back (in the back direction). FIG.
11 is a perspective view of the speaker according to the modification of the present embodiment
as viewed from the front side (front direction). 12 shows an A-a cross-sectional view of the
speaker shown in FIG. 10, and FIG. 13 shows a B-b cross-sectional view of the speaker shown in
FIG. In addition, the same code | symbol is attached | subjected to the element similar to FIGS. 14, and detailed description is abbreviate | omitted.
[0089]
The speaker 2 shown in FIGS. 10 to 13 includes a diaphragm 11, a roll edge 12, a frame 13, a
voice coil bobbin 14, a voice coil 15, a magnetic circuit 21a having a plate 16a, a magnet 17a
and a yoke 18a. Have.
[0090]
11-05-2019
23
The magnetic circuit 21 a is a circuit for driving the voice coil 15.
In other words, the magnetic circuit 21 a generates a driving force for driving the voice coil 15.
The magnetic circuit 21a is formed in a long shape (elongated shape in this case) which has a
similar shape to the voice coil 15, and as shown in FIG. Have. Further, as shown in FIG. 13, the
magnetic circuit 21 is an external magnet type magnetic circuit in which the magnet 17 is
formed outside the yoke 18.
[0091]
The yoke 18a is a component for bonding (fixing) the magnet, and is configured such that the
cross section in the lateral direction has an inverted T shape, that is, a convex portion at the
central portion. In addition, this convex part is called a center pole.
[0092]
The magnet 17 a is disposed on the bottom surface of the yoke 18 so as to face the outer surface
of the convex portion (center pole) of the yoke 18.
[0093]
The plate 16a is disposed to face the outer surface of the convex portion (center pole) of the yoke
18, and is fixed (disposed) to the upper surface of the magnet 17a.
[0094]
The through hole 19a is provided so as to penetrate the central portion of the convex portion
(center pole) of the yoke 18, and serves to guide the sound generated by the diaphragm 11 to the
surface (front direction) of the speaker.
[0095]
The magnetic gap 22a is a gap (a gap) between the plate 16 and the yoke 18, and is a gap (a gap)
for generating magnetic flux in a concentrated manner.
11-05-2019
24
Further, since the magnetic gap 22a is configured in a similar shape to the voice coil 15, as with
the magnetic gap 22, when viewed from the rear direction, it has two long linear shapes in the
longitudinal direction.
[0096]
Further, the magnetic gap 22 a includes a magnetic gap inner portion which is a gap (interval)
between the inner wall of the voice coil bobbin 14 and the outer peripheral surface of the center
pole.
In other words, the magnetic gap inner portion is a gap (interval) between the inner wall of the
voice coil bobbin 14 and the outside of the center pole.
Then, the magnetic gap 20 is filled with the magnetic fluid 20 attracted by the magnetic force, so
that the sound generated by the diaphragm 11 is blocked between the inside and the outside.
[0097]
The magnetic fluid 20 is a liquid having magnetic adsorptivity, which is a characteristic of being
attracted by magnetic force, and is filled (arranged) so as to close the inner portion of the
magnetic gap. Thereby, in the space surrounded by the diaphragm 11 and the inner wall of the
voice coil bobbin 14, the magnetic fluid 20 blocks the passage of the sound generated by the
diaphragm 11 other than the through holes 19a. That is, the sound generated by the diaphragm
11 is blocked on the inside and the outside.
[0098]
Second Embodiment In the first embodiment, the configuration in which the diaphragm 11 is
supported by the roll edge 12 has been described, but the present invention is not limited
thereto. In the second embodiment, a case where a diaphragm 11 is added to the roll edge 12
and supported using a damper will be described.
11-05-2019
25
[0099]
Hereinafter, the speaker 3 according to the second embodiment will be described.
[0100]
14 to 16 are diagrams showing the configuration of the speaker in the second embodiment of
the present invention.
FIG. 14 is a perspective view showing the configuration of the loudspeaker according to the
present embodiment as viewed from the front. FIG. 15 shows an A-a sectional view of the speaker
shown in FIG. 14, and FIG. 16 shows a B-b sectional view of the speaker shown in FIG. Further,
FIGS. 17 and 18 are diagrams each showing components constituting the speaker shown in FIG.
FIG. 17 shows a connecting member, and FIG. 18 shows a damper. 14-16, the same referential
mark is attached | subjected to the element similar to FIGS. 1-8, and detailed description is
abbreviate | omitted.
[0101]
The speaker 2 according to the present embodiment shown in FIGS. 14 to 16 is configured in
that a connecting member 25 and a damper 26 are provided to the speaker 1 according to the
first embodiment shown in FIGS. 1 to 8. Is different. Specifically, in the speaker 2 according to
the present embodiment, compared to the speaker 1 according to the first embodiment, a
configuration in which the connecting member 25 is passed through the through hole 19 and the
connecting member 25 is supported by the damper 26 is added. ing.
[0102]
One end of the connecting member 25 is vertically fixed to the diaphragm 11, and the diaphragm
11 and one end of the damper 26 are connected to each other through the through hole 19.
[0103]
Specifically, as shown in FIG. 17, the connecting member 25 is a flat portion 27 provided as one
end to be fixed to the diaphragm 11, and a speaker from the back surface of the diaphragm 11
11-05-2019
26
through the through hole 19. 3 and a connecting portion 29 reaching the front surface (front
direction side).
At the end of the connecting portion 29 (the end opposite to the flat portion 27), a projection 28
connected to the damper 26 is formed. Then, as shown in FIG. 16, one end of the connecting
member 25 is vertically fixed to the back surface (front direction) of the diaphragm 11, that is,
the through hole 19 side of the diaphragm 11. Thereby, the connecting member 25 connects the
diaphragm 11 and the damper 26 via the through hole 19.
[0104]
One end of the damper 26 is connected to the other end of the connecting member 25, and the
other end is connected to the frame 13 of the speaker 3. Specifically, as shown in FIG. 18, the
damper 26 includes a damper flat portion 30, two semicircular rolls 261, and a connection area
262 formed between the two semicircular rolls 261. It consists of
[0105]
The connection area 262 has a flat area of a certain area for fixing the protrusion 28, and the
protrusion 28 is fixed as shown in FIGS. 15 and 16.
[0106]
The damper flat portion 30 is fixed to the frame 13.
[0107]
The roll 261 is formed by injection molding using a foamed rubber material, a solid rubber, or a
polymer material as a material.
Here, it is desirable that the roll 261 is configured to be thin at the top of the roll and thick at the
base.
The direction in which the roll 261 of the damper 26 is attached is perpendicular to the direction
11-05-2019
27
in which the roll of the roll edge 12 is attached as viewed from the front.
[0108]
The connecting member 25 and the damper 26 configured as described above support the
diaphragm 11 together with the roll edge 12. In other words, the voice coil 15 is supported by
the connecting member 25 and the damper 26 on the frame 13 via the diaphragm 11.
[0109]
Next, the effects of the speaker 3 configured as described above will be described.
[0110]
That is, the speaker 3 of the present embodiment is supported by the damper 26 together with
the roll edge 12 to realize reinforcement of the support system as compared with the speaker 1
of the first embodiment.
Specifically, the damper 26 supports the diaphragm 11 and the voice coil 15 via the connection
member 25 fixed to the diaphragm 11. Therefore, in the speaker 3, stable vibration of the
vibration system can be realized by supporting the vibration system (diaphragm 11, voice coil
bobbin 14 and voice coil 15) by the roll edge 12 and the damper 26 at two points. Furthermore,
the roll edge 12 and the damper 26 are disposed on the front and back (front and back) of the
diaphragm 11 to realize a structure in which the center of gravity of the vibration system exists
between two supports (roll edge 12 and damper 26). There is. For this reason, a support system
can be realized in which the distance between the support points of the two-point support is
maximized, so that more stable vibration system support can be performed. As a result, rolling
and abnormal vibration do not occur even if the vibration system has a large amplitude, so that
the speaker 3 with little distortion can be realized.
[0111]
In addition, since the directions of the damper 26 and the roll edge 12 are orthogonal to each
other, a support system having resistance in both the lateral direction and the longitudinal
direction of the speaker 3 can be realized.
11-05-2019
28
[0112]
As described above, according to the second embodiment, it is possible to realize the speaker 3
with excellent sound quality in which split resonance does not easily occur even with the
elongated structure, and flat frequency characteristics can be obtained.
[0113]
In addition, the connection member 25 is not limited to the form mentioned above.
For example, the connecting member 31 in which the length of the connecting portion 29 is
shortened may be used.
An example in that case is described below.
[0114]
FIG. 19 is a diagram showing a configuration of a speaker in a modification of the second
embodiment of the present invention. FIG. 19 shows a perspective view of the configuration of
the speaker according to the present modification as viewed from the back side (the back side
direction). In addition, the same referential mark is attached | subjected to the element similar to
FIGS. 1-8, and detailed description is abbreviate | omitted.
[0115]
A speaker 3 according to the present modification shown in FIG. 19 is different from the speaker
2 according to Embodiment 2 in the configurations of a damper 26A, a connecting member 31,
and an auxiliary frame 32.
[0116]
Specifically, the connecting member 31 is fixed to the diaphragm 11 on the same side as the roll
edge 12.
11-05-2019
29
In addition, the auxiliary frame 32 is attached to the top of the frame 13 in the back direction of
the speaker 3. Also, the damper 26A is fixed to the auxiliary frame 32 in the back direction of the
speaker 3. More specifically, as in the second embodiment, damper 26A is a connection area
formed between damper flat portion 30, two semicircular rolls 261, and two semicircular rolls
261. 262 and the like. The end (protrusion 28) of the connecting area 262 is fixed to the end of
the connecting member 31 which is not fixed to the diaphragm 11. Also, the damper flat portion
30 is fixed to the auxiliary frame 32.
[0117]
Thus, the speaker 3 may constitute a support system by the damper 26A, the connecting
member 31, and the auxiliary frame 32. With such a configuration, the damper 26A and the roll
edge 12 can be configured on the same side. Therefore, since the damper 26A can be fixed
without turning over the speaker 3 after fixing the roll edge 12, the assembling operation can be
simplified. Further, that the connecting member 31 is not formed in the through hole 19 means
that the through hole 19 which is a passage of the sound emitted by the diaphragm 11 is not
closed, and the sound quality is lower than that of the speaker 2 of the second embodiment. The
effect is improved.
[0118]
Third Embodiment In the first and second embodiments, the inner shape of the voice coil bobbin
14 is described as a rectangle (rectangular parallelepiped), but the present invention is not
limited thereto. Since the voice coil 15 is wound on the outside of the voice coil bobbin 14, the
inside dimension of the voice coil bobbin 14 can be maintained substantially uniform, but the
voice coil bobbin 14 is formed in a thin sheet shape, so that the longitudinal The width in the
short direction may increase near the center of the direction. Hereinafter, this case will be
described as the speaker according to the third embodiment.
[0119]
FIG. 20 is a perspective view showing a magnetic circuit constituting the speaker of the third
embodiment. FIG. 21 is a plan view showing a magnetic circuit constituting the speaker of the
11-05-2019
30
third embodiment. FIG. 22 is a plan view showing the yoke 34 constituting the speaker of the
third embodiment. The same elements as in FIG. 8 are denoted by the same reference numerals,
and the detailed description will be omitted.
[0120]
The magnetic circuit 33 shown in FIGS. 20 and 21 includes a plate 16, a magnet 17 (not shown),
a through hole 19, a yoke 34, and a magnetic gap 35, similarly to the magnetic circuit 21 shown
in FIG. The magnet 17 is an inner magnet type magnetic circuit configured inside the yoke 34.
[0121]
This magnetic circuit 33 is substantially similar to the magnetic circuit 21 shown in FIG. 8 in that
as shown in FIG. 21, the yoke 34 has a length at the center in the longitudinal direction gradually
wider than that at the end. It is configured in an arc shape.
[0122]
The magnet 17 is fixed to the lower portion of the rectangular parallelepiped plate 16 on one
side and to the yoke 34 on the other side.
[0123]
The yoke 34 is formed in a concave shape in a cross section in the short direction, and the side
opposite to the side in the longitudinal direction of the plate 16 is substantially arc-shaped when
viewed from the back direction of the speaker. The width in the hand direction is wider than the
width in the lateral direction of the longitudinal end.
In addition, the yoke 34 forms a gap including the magnetic gap 35 between the side in the
longitudinal direction of the plate 16 and the side opposite to the side when viewed from the rear
direction of the speaker.
Specifically, the yoke 34 is configured as shown in FIG. 22, and the length Dc in the widthwise
direction at the central portion in the longitudinal direction is smaller than the length De in the
widthwise direction at the end in the longitudinal direction. It has a gentle arc shape so as to
widen.
11-05-2019
31
[0124]
The magnetic gap 35 is a gap (interval) between the plate 16 including the magnetic gap inner
portion including the gap (interval) between the plate 16 and the recess inner wall of the yoke 34
and the yoke 34 to generate magnetic flux concentratedly. Gap between the
The magnetic gap 35 here is such that the plate 16 has a rectangular parallelepiped shape and
the yoke 34 has the above-described arc shape, so that the central portion in the longitudinal
direction is shorter than the end portion in the longitudinal direction as shown in FIG. The length
of the hand direction is wide.
[0125]
The speaker of Embodiment 3 is configured as described above.
[0126]
Next, the effect of the speaker configured as described above will be described.
[0127]
First, the vibration system of the speaker 1 will be described.
That is, a current is applied to the voice coil 15.
Then, in the voice coil 15, a driving force is generated in the voice coil 15 by the applied current
and the magnetic field of the magnetic circuit 33, and the diaphragm 11 is vibrated through the
voice coil bobbin 14. That is, the voice coil 15 vibrates the diaphragm 11 by the generated
driving force, and the sound generated by the vibration of the diaphragm 11 is radiated to the
space.
[0128]
11-05-2019
32
Subsequently, the magnetic fluid 20 generates an internal pressure so that the voice coil bobbin
14 does not contact the plate 16. The voice coil bobbin 14 has a substantially square cylindrical
shape and an elongated shape, but is displaced so as to expand outward by the internal pressure.
At that time, the central part is displaced the most.
[0129]
The magnetic circuit 21 shown in the first and second embodiments has the linear magnetic gap
22, but the width of the magnetic gap 22 is wide over the entire circumference. On the other
hand, in the magnetic circuit 33 of the present embodiment, the inner surface of the yoke 34 is
formed in an arc shape, so that the magnetic gap 35 has a wider central portion than the end in
the longitudinal direction. That is, in the magnetic circuit 33 according to the present
embodiment, in consideration of the swelling at the central portion in the longitudinal direction
of the voice coil bobbin 14, the magnetic gap 35 corresponding to the amount of deformation is
provided instead of widening over the entire circumference.
[0130]
With this configuration, it is possible to prevent a decrease in magnetic flux density and realize a
speaker having a high sound pressure level.
[0131]
As described above, according to the third embodiment, it is possible to realize a speaker with
excellent sound quality in which split resonance does not easily occur even with the elongated
structure, and flat frequency characteristics can be obtained.
[0132]
Although the inner wall of the yoke 34 is described as being configured as an arc, it is not limited
thereto.
For example, the widths of the longitudinal center and the end may be linearly changed to form
an isosceles triangle.
11-05-2019
33
[0133]
Further, although the magnetic circuit 33 has been described as an internal magnet type
magnetic circuit in which the magnet 17 is configured inside the yoke 34, the present invention
is not limited thereto.
It may be an external magnet type magnetic circuit in which a magnet is disposed outside. In that
case, the plate 16a shown in FIGS. 10 to 13 has a substantially arc-shaped side in the
longitudinal direction opposite to the center pole as viewed from the back of the speaker, and the
width of the central portion in the longitudinal direction is an end The width may be wider than
the width of the part.
[0134]
As described above, according to the present invention, it is possible to realize a speaker with
excellent sound quality, which is an elongated structure and in which split resonance does not
easily occur and flat frequency characteristics can be obtained.
[0135]
Note that the speaker according to the present invention can be easily made slim and thin, and
therefore, can be used for a thin television as shown in FIG. 23, or an electronic device such as a
mobile phone or a PDA.
In other words, the electronic device is configured to include the speaker according to the
present invention and a housing that holds the speaker inside.
[0136]
As mentioned above, although the speaker of this invention and the electronic device provided
with it were demonstrated based on embodiment, this invention is not limited to this
embodiment. Without departing from the spirit of the present invention, various modifications
that may occur to those skilled in the art may be made to the present embodiment, or a form
11-05-2019
34
constructed by combining components in different embodiments is also included in the scope of
the present invention. .
[0137]
INDUSTRIAL APPLICABILITY The present invention can be applied to a speaker capable of a
large amplitude while having an elongated structure and capable of reproducing up to lower
frequencies and an electronic device provided with the same.
[0138]
1, 2, 3 speaker 11, 11A, 809 diaphragm 12 roll edge 13, 804 frame 14, 805 voice coil bobbin
15, 806 voice coil 16, 16a, 802 plate 17, 17a, 801 magnet 18, 18a, 34, 803 yoke 19, 19a
through hole 20 magnetic fluid 21, 21a, 33 magnetic circuit 22, 22a, 35, 808 magnetic gap 23
reinforcing rib 25 connecting member 26, 26A, 807 damper 27 flat portion 28 projection 29
connecting portion 30 damper flat portion 31 connecting Parts 32 Auxiliary frame 261 Roll 262
Coupling area 810 Dust cap 811 edge
11-05-2019
35
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