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JP2008167150

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2008167150
An object of the present invention is to provide a speaker capable of achieving both excellent
high frequency characteristics and excellent middle high frequency characteristics. SOLUTION: A
corrugation 5a is provided at an intermediate position of the diaphragm 5, and the damping
member 8 is stuck on the outer peripheral side of the diaphragm 5 near the outer peripheral
edge of the corrugation 5a. While suppressing transmission of high-frequency vibration, in the
high-frequency region, only the inner circumferential side vibrates mainly on the inner side of
the corrugation 5a, and the resonance in the mid-high region on the outer circumferential side
relative to the corrugation 5a in the diaphragm 5 Was also configured to suppress. [Selected
figure] Figure 1
スピーカ
[0001]
The present invention relates mainly to full-range speakers, which are widely used in stereo and
multi-channel sound reproducing devices, radios and televisions.
[0002]
In recent years, with the spread of multi-channel home theater playback devices and the like, in
order to install a large number of speakers in a home, further downsizing and cost reduction of
the speakers are required.
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1
Therefore, it is desirable that one speaker can reproduce high-quality sound from low frequency
to high frequency without using multi-way speakers.
[0003]
However, in general, it is difficult to reproduce with excellent sound quality from the low band to
the high band with only one speaker, and it is particularly difficult to reproduce the high band
with an excellent characteristic. This is because the aperture of the speaker can not be made very
small in order to reproduce to a low frequency to a certain extent, the high frequency
reproduction frequency band narrows, and in particular, the directivity characteristic of the high
frequency area also becomes worse. The difficulty of regenerating the area with excellent
properties is well known.
[0004]
On the other hand, for example, a speaker as described in Non-Patent Document 1 has long been
proposed as a speaker in which high frequency characteristics are improved, and some products
have been commercialized in practice. FIG. 9 is a block diagram of a conventional speaker
described in Non-Patent Document 1 for improving the high frequency characteristic, which will
be described below with reference to FIG.
[0005]
In FIG. 9, the field section 41, the damper 44 and the edge 47 are attached to the frame 42, and
the voice coil 43 is supported by the damper 44. The diaphragm 45 is a cone type, and the inner
peripheral side thereof is coupled to the voice coil 43, and the outer peripheral side is supported
by the edge 47. The dust cap 46 is attached to the inner periphery of the diaphragm 45. A
corrugation 45 a is provided at an intermediate position of the diaphragm 45.
[0006]
With this configuration, the entire diaphragm 45 vibrates in the low band, but the corrugation 45
a operates as a mechanical filter in the high band, and the high band vibration is less likely to be
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2
transmitted to the outer peripheral side than the corrugation 45 a. Only the inner circumference
side of the corrugation 45a of the second embodiment vibrates mainly, and the high frequency
characteristic is improved. Yamamoto Takeo ed. "Speaker system (upper)" radio technology
company publication, first edition: July 15, 1977, P. 145 Figure 5 2
[0007]
However, in the above-described conventional speaker, when it is intended to suppress the
transmission of high-frequency vibration to the outer peripheral side of the diaphragm 45 with
respect to the corrugation 45 a, the mechanical compliance of the corrugation 45 a must be
greatly increased. The vibration mode of the outer peripheral portion of the above is disturbed or
resonance occurs, and the mid-high frequency characteristics are significantly degraded.
[0008]
In addition, in order to prevent the deterioration of the middle and high frequency
characteristics, the mechanical compliance of the corrugation 45a has to be made very small.
Therefore, suppressing the vibration transmission of the high region to the outer peripheral
portion of the diaphragm 45 by only the corrugation 45a. There is a problem that it is impossible
to improve the high frequency characteristic.
[0009]
Recently, with the progress of diaphragm materials, etc., the difficulty of expanding the high
frequency reproduction frequency band only on the axis of the speaker is gradually becoming
smaller, but the directivity characteristics off the axis of the speaker I just couldn't improve.
This is because the high frequency band is also radiated from the outer peripheral portion of the
diaphragm 45 by the high frequency vibration transmission to the outer peripheral portion of the
diaphragm 45, and the effective vibration area does not decrease.
[0010]
There is also known a method of adding a sub cone for high frequency reproduction without
providing the diaphragm with a corrugation.
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However, since the high sound emitted from the diaphragm and the high sound emitted from the
sub cone interfere with each other to cause deterioration of the sound quality, it is desirable that
the high frequency characteristic can be improved by one diaphragm.
[0011]
The present invention solves such conventional problems, and can achieve both excellent high
frequency characteristics, that is, a wide reproduction frequency band with high frequency and
particularly wide directivity characteristics, and excellent middle and high frequency
characteristics, and further cost increase. The aim is to provide a speaker that is both unique and
even unique in appearance.
[0012]
The speaker according to the present invention has a diaphragm in which the inner peripheral
side is coupled to the voice coil and a corrugation is provided at an intermediate position thereof,
an edge supporting the outer peripheral side of the diaphragm, and the vicinity of the outer
peripheral edge of the corrugation in the diaphragm. A damping member attached to the outer
peripheral portion is provided, and an effective vibration area on the inner peripheral side of the
inner peripheral edge of the corrugation is configured to be approximately half or less of the
total effective vibration area.
[0013]
With this configuration, the mass of the braking member and the mechanical resistance are
superimposed to increase the mass and mechanical resistance of the diaphragm on the outer
peripheral side of the corrugation, so that high-frequency vibration transmission to the
diaphragm on the outer peripheral side of the corrugation is suppressed. Not only that, but it is
also possible to suppress resonance and divided vibration in the middle and high frequencies.
[0014]
According to the speaker of the present invention, vibration transmission in the high region to
the diaphragm on the outer peripheral side of the corrugation is suppressed, so that in the high
region, only the diaphragm on the inner peripheral side of the corrugation mainly vibrates, which
is effective. The vibration area is reduced.
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Therefore, the high frequency reproduction frequency band is broadened, and in particular, the
directivity characteristic of the high frequency band is broadened, and excellent high frequency
characteristics can be obtained.
Further, since the resonance and the divided vibration in the middle high region of the
diaphragm on the outer peripheral side of the corrugation are suppressed, excellent middle and
high frequency characteristics can also be obtained.
[0015]
In addition, the damping member can be integrally formed of the edge by forming the damping
member with the adhesive portion of the edge by extending the adhesive portion of the edge to
the diaphragm to the vicinity of the outer peripheral edge of the corrugation. You can suppress
the up.
[0016]
Further, by providing the braking member on the front side of the diaphragm, not only can the
unnecessary unnecessary vibration due to the skin effect of the diaphragm material in the middle
and high frequencies or high regions be suppressed, and the material appearance of the braking
member and the diaphragm The contrast can also give a unique appearance.
[0017]
Further, a plurality of the corrugations are provided, and the braking member is provided on the
outer peripheral portion of the outermost periphery of the outer periphery of the outer
periphery, and the effective vibration area on the inner peripheral side of the inner peripheral
edge of the innermost peripheral corrugation is the total effective vibration. By making the area
approximately half or less, a plurality of corrugations are formed, so that the rigidity of the whole
diaphragm is enhanced by the rib reinforcing effect of the plurality of corrugations, and a
speaker capable of high power reproduction can be realized.
[0018]
Hereinafter, the best mode for carrying out the present invention will be described in detail with
reference to the drawings.
[0019]
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5
First Embodiment First, the configuration of a speaker according to a first embodiment of the
present invention will be described with reference to FIG.
FIG. 1 is a block diagram of a speaker according to a first embodiment of the present invention,
in which (a) shows a cross section and (b) shows a front appearance.
[0020]
In FIG. 1, the field portion 1, the damper 4 and the edge 7 are attached to the frame 2, and the
voice coil 3 is supported by the damper 4.
The diaphragm 5 is a cone type, and the inner peripheral side thereof is coupled to the voice coil
3, and the outer peripheral side is supported by the edge 7.
The dust cap 6 is attached near the inner peripheral portion of the diaphragm 5.
[0021]
A corrugation 5 a is provided at an intermediate position of the diaphragm 5.
A damping member 8 is attached to the outer peripheral portion of the diaphragm 5 in the
vicinity of the outer peripheral edge of the corrugation 5 a.
Further, the effective vibration area on the inner peripheral side of the inner peripheral edge of
the corrugation 5a is set to about half or less of the total effective vibration area.
[0022]
Next, specific dimensions and materials of the component parts of the speaker of Embodiment 1
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6
will be described. The aperture of this speaker is 6.5 cm, so-called a full range type. The field part
1 is an external magnet type field part by a general ferrite magnet. The material of the frame 2 is
an iron plate. The nominal diameter of the voice coil 3 is 19 mm. The material of the damper 4 is
a cotton cloth.
[0023]
The material of the diaphragm 5 is pulp having a thickness of about 0.25 mm, and the outer
diameter of the diaphragm 5 is 47 mm. The cross-sectional shape of the corrugation 5 a is
formed to project to the surface side in an arc shape of approximately 1⁄3 of the circumference,
and the cross-sectional radius of curvature is about 1 mm. The outer peripheral diameter of the
corrugation 5a is 35 mm, and the inner peripheral diameter is 32 mm. The material of the dust
cap 6 is a pulp having a thickness of about 0.2 mm and a diameter of 24 mm. The material of the
edge 7 is urethane foam having a thickness of 0.5 mm, the outer peripheral diameter of the roll
portion is 58 mm, and the inner peripheral diameter of the roll portion is 48 mm. That is, the
effective vibration diameter is 53 mm, and the total effective vibration area of the speaker of the
first embodiment is about 22 cm <2>. The diameter of the inner peripheral edge of the
attachment portion of the edge 7 to the diaphragm 5 is 44 mm.
[0024]
The material of the braking member 8 is a foamed rubber having a thickness of about 0.5 mm,
the outer peripheral diameter is 47 mm, and the inner peripheral diameter is 37 mm. That is, the
braking member 8 is attached to the outer side of the outer peripheral edge of the corrugation 5a
and is stuck to the vicinity thereof. The effective vibration area on the inner peripheral side of the
inner peripheral edge of the corrugation 5a is about 8 cm <2>, which is about half or less of the
total effective vibration area.
[0025]
The principle, operation, and effects of the speaker according to the first embodiment configured
as described above will be described below with reference to FIGS. 2, 3, 10, and 11. FIG. FIG. 2 is
a symbol explanatory view of an electro-acoustic equivalent circuit of the speaker in the first
embodiment, and FIG. 3 is an electro-acoustic equivalent circuit diagram thereof. FIG. 10 is a
symbol explanatory view of a conventional electroacoustic equivalent circuit of a speaker, and
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FIG. 11 is an electroacoustic equivalent circuit diagram thereof.
[0026]
First, with reference to FIG. 10 and FIG. 11, the problems of the conventional speaker are
analyzed in principle. In FIGS. 10 and 11, Fvc is a driving force of the voice coil 43, and Vvc is a
vibration velocity of the voice coil 43. Mvc is the equivalent vibration mass of the voice coil
winding portion 43a, and Cvc is the mechanical compliance of the voice coil bobbin portion 43b.
Mdc is an equivalent vibration mass of the dust cap 46. Mdi is the equivalent vibration mass of
the diaphragm 45b on the inner peripheral side of the corrugation 45a, and Vdi is its vibration
velocity. Generally, Cvc is small, so it can be almost ignored except for the ultra-high range.
[0027]
Cc is the machine compliance of the corrugation 45a. Vc is the vibration velocity absorbed by the
corrugation 45a. Mdo is an equivalent vibration mass of the diaphragm 45c on the outer
peripheral side of the corrugation 45a, Z is an equivalent mechanical impedance appearing
during divided vibration of the same portion, and Vdo is a vibration velocity of the same portion.
[0028]
If the mechanical compliance Cc is increased, that is, if the corrugation 45a is softened, the
vibration velocity Vc increases and the vibration velocity Vdo decreases, so it is possible to
suppress high-frequency vibration transmission to the diaphragm outer peripheral portion 45c.
[0029]
However, as the mechanical compliance Cc is increased, the Q of the resonant circuit formed by
the mechanical compliance Cc and the equivalent vibration mass Mdo is increased, so that the
vibration velocity Vdo is increased at the resonance frequency.
That is, the diaphragm outer peripheral portion 45c generates a large resonance in the middle
and high frequencies.
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8
[0030]
Next, with reference to FIG. 2 and FIG. 3, the principle, operation, and effects of the speaker of
the first embodiment will be described. In FIGS. 2 and 3, Fvc is a driving force of the voice coil 3,
and Vvc is a vibration speed of the voice coil 3. Mvc is the equivalent vibration mass of the voice
coil winding portion 3a, and Cvc is the mechanical compliance of the voice coil bobbin portion
3b. Mdc is an equivalent vibration mass of the dust cap 6. Mdi is the equivalent vibration mass of
the diaphragm 5b on the inner peripheral side of the corrugation 5a, and Vdi is its vibration
velocity.
[0031]
Cc is the machine compliance of the corrugation 5a. Vc is the vibration velocity absorbed by the
corrugation 5a. Mdo is an equivalent vibration mass of the diaphragm 5c on the outer peripheral
side of the corrugation 5a, Z is an equivalent mechanical impedance appearing during divided
vibration of the same portion, and Vdo is a vibration velocity of the same portion. And, Mda is an
equivalent vibration mass of the braking member 8 and Rda is its mechanical resistance, in other
words, viscoelastic resistance.
[0032]
As can be seen from the electroacoustic equivalent circuit of FIG. 3, since the equivalent vibration
mass Mda and the mechanical resistance Rda are inserted in series in the equivalent vibration
mass Mdo, the vibration velocity Vdo is sufficiently small without increasing the mechanical
compliance Cc. can do. That is, even if the corrugation 5a is not softened, high-frequency
vibration transmission to the diaphragm outer peripheral portion 5c can be suppressed by
utilizing the equivalent mass Mda of the braking member 8 and the mechanical resistance Rda.
That is, it can be said that the braking member 8 brakes the diaphragm outer peripheral portion
5c in terms of mass and mechanical resistance.
[0033]
Furthermore, since Q of the resonant circuit composed of the mechanical compliance Cc, the
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9
equivalent vibration mass Mda, the mechanical resistance Rda, and the equivalent vibration mass
Mdo is smaller due to the mechanical resistance Rda, the diaphragm outer peripheral portion 5c
is less likely to resonate in the middle and high frequencies. Become. Further, since the
mechanical resistance Rda is also in series with the equivalent mechanical impedance Z, the
divided vibration of the diaphragm outer peripheral portion 5c is also suppressed.
[0034]
Therefore, as described above, according to the configuration of the first embodiment, the
vibration transmission of the high region to the diaphragm 5c on the outer peripheral side of the
corrugation 5a is suppressed, so the high region on the inner peripheral side of the corrugation
5a in the high region. Only the diaphragm 5b vibrates mainly, and the effective vibration area is
reduced. As a result, the reproduction frequency band in the high frequency band is broadened,
and in particular, the directivity characteristic in the high frequency band is broadened, and an
excellent high frequency band characteristic can be obtained. Further, since the resonance and
the divided vibration in the middle and high regions of the diaphragm 5c on the outer peripheral
side of the corrugation 5a are suppressed, excellent middle and high frequency characteristics
can also be obtained. In addition, since the damping member 8 is attached to the front side of the
diaphragm 5, it is possible to suppress even the fine unnecessary vibration due to the skin effect
of the diaphragm material in the middle and high frequencies or the high frequency.
[0035]
By the way, in order to exert the above-mentioned effect of the present invention, a desirable
relation exists between the diaphragm 5, the corrugation 5a and the damping member 8. When
the outer peripheral edge of the corrugation 5a and the inner peripheral edge of the braking
member 8 are far apart, the braking effect of the middle high region of the diaphragm outer
peripheral portion 5c by the braking member 8 is reduced. It is desirable to have an inner
peripheral edge. Further, in order to obtain a sufficient braking effect by the braking member 8,
it is preferable that the area of the braking member 8 be half or more of the area of the
diaphragm 5 outside the outer peripheral edge of the corrugation 5a.
[0036]
In addition, when the damping member 8 gets over the corrugation 5a and reaches the
diaphragm inner peripheral portion 5b, the vibration in the high region of the diaphragm inner
peripheral portion 5b is suppressed, and the damping member 8 also hangs on the corrugation
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10
5a Since the mass productivity of the speaker is deteriorated to cause a significant cost increase,
it is desirable that the damping member 8 be on the outer peripheral side than the outer
peripheral edge of the corrugation 5a.
[0037]
Also, if the diameter of the corrugation 5a is not reduced to a certain extent or more with respect
to the effective vibration diameter constituting the total effective vibration area, the effect of
reduction of the effective vibration mark in the high region becomes small and the improvement
effect of the high region characteristics Not only the area of the damping member 8 can not be
sufficiently secured, the resonance suppressing effect of the diaphragm outer peripheral portion
5c by the damping member 8 also decreases.
Therefore, by setting the effective vibration area on the inner peripheral side of the inner
peripheral edge of the corrugation 5a to approximately half or less of the total effective vibration
area, sufficient effects can be obtained at the above two points. did.
[0038]
By sticking the damping member 8 to the diaphragm 5, the overall effective vibration mass tends
to increase, and the output sound pressure level of the speaker tends to decrease. However, if the
diaphragm 5 is designed lightly in advance, That is, for example, if the material of the diaphragm
5 is made thin, it is possible to prevent the sound pressure drop due to the braking member 8.
[0039]
In the first embodiment, the diaphragm 5 has a cone shape, but it may have a dome shape, an
inverted conical cone shape, a planar shape, or any other shape as will be described later in the
fourth embodiment.
Although the diaphragm 5 is circular in the first embodiment, it may be square, rectangular, oval
or any other shape. In addition, although the corrugation 5a is circular, it may be rectangular,
rectangular, elliptical or any other shape. That is, the shape of the diaphragm and the corrugation
may not be the same.
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11
[0040]
Further, in the first embodiment, the cross-sectional shape of the corrugation 5 is an arc and has
a shape projecting to the surface side, but a step shape, a wave shape, a concave arc, and other
cross sections as described later in the third embodiment Of course, it may be shaped.
[0041]
In addition, although the number of corrugations 5 is one in the first embodiment, a plurality of
corrugations 5 may be used.
In this case, if the braking member is disposed on the outer peripheral portion of the outermost
periphery of the outer peripheral portion of the corrugation, mass productivity does not
deteriorate and the cost does not increase. In addition, if the effective vibration area on the inner
peripheral side of the inner peripheral edge of the innermost peripheral corrugation is
approximately half or less of the total effective vibrational register, the effect of reducing the
effective vibration area in the high region can be secured. . When a plurality of corrugations are
formed, the rigidity of the entire diaphragm is increased by the rib reinforcing effect of the
plurality of corrugations, so that a speaker capable of reproducing even more high power can be
realized.
[0042]
Although the material of the diaphragm 5 is pulp in the first embodiment, it is needless to say
that various materials such as metal, resin molded product, resin film and the like can be used.
For example, when the diaphragm 5 is a resin molded product, the diaphragm outer peripheral
portion 5c is formed to be thicker than the diaphragm inner peripheral portion 5b, and the
equivalent vibration mass Mdo in FIG. The effect of can be further enhanced. Further, since the
thickness of the corrugation 5a can be made thinner than the diaphragm 5, the degree of
freedom in design of the mechanical compliance Cc in FIG. 3 is increased.
[0043]
Further, in the first embodiment, the inner peripheral edge portion of the damping member 8 is
provided up to a distance of 1 mm from the outer peripheral edge of the corrugation 5a, but the
area of the damping member 8 is the diaphragm 5 outside the outer peripheral edge of the
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12
corrugation 5a. This interval may be made wider as long as a half or more of the area can be
secured.
[0044]
Although the material of the edge 7 is urethane foam in the first embodiment, it is needless to
say that various materials such as cloth, various rubbers, elastomers, and paper may be used.
Although the material of the braking member 8 is foam rubber, various materials such as cloth,
solid rubber, urethane foam, etc. can be used as will be described later in the second
embodiment. Needless to say, the present invention is not limited to the examples described
above.
[0045]
Second Embodiment Next, a loudspeaker according to a second embodiment of the present
invention will be described with reference to FIGS. 4, 5 and 6. FIG. FIG. 4 is a block diagram of a
loudspeaker according to the second embodiment of the present invention, FIG. 5 is a frequency
characteristic chart of a conventional loudspeaker, and FIG. 6 is a frequency characteristic
diagram of the loudspeaker according to the second embodiment of the present invention.
[0046]
In FIG. 4, the specifications of the field portion 11, the frame 12, the voice coil 13, the damper
14, and the dust cap 16 are the same as those of the first embodiment described above, and thus
the description thereof is omitted. The difference of the second embodiment from the first
embodiment is the thickness of the diaphragm 15, the material of the edge 17, and the pasting
portion 17a of the edge to the diaphragm 15 integrally formed on the edge 17.
[0047]
The dimension of the diaphragm 15 is the same as that of the first embodiment, but the material
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13
is a pulp having a thickness of about 0.2 mm. As in the first embodiment, the corrugation 15a is
formed to project on the surface side in a circular arc shape of approximately 1⁄3 of the
circumference and has a sectional radius of curvature of about 1 mm, which is outside the
corrugation 15a. The peripheral diameter is 35 mm and the inner peripheral diameter is 32 mm.
[0048]
The dimensions of the roll portion of the edge 17 are the same as in the first embodiment, but
the material is a rubber-coated cloth having a thickness of about 0.2 mm. The edge affixing
portion 17a to the diaphragm 15 is provided on the front side of the diaphragm 15, and its inner
peripheral diameter is 37 mm. That is, the edge sticking margin 17a is extended to the vicinity of
the outer peripheral edge of the corrugation 15a, and this edge sticking margin 17a is used as a
braking member. Here, the material of the edge affixing portion 17a is integrally formed with the
edge 17 and is the same rubber coated cloth.
[0049]
By being configured as described above, the speaker of the second embodiment has exactly the
same operation and effect as the first embodiment. That is, since the edge sticking margin 17a
operates as a braking member, the same function and effect as described in the first embodiment
can be obtained.
[0050]
The effects will be specifically described with reference to FIGS. 5 and 6. The conventional
speaker whose frequency characteristic is shown in FIG. 5 is also the same as the speaker of the
second embodiment with an aperture of 6.5 cm, and only the diaphragm and the edge are
different. The diaphragm of this conventional speaker is a normal cone type of pulp having a
thickness of about 0.3 mm without corrugation. The width of the margin of the edge is 2 mm,
and it is affixed to the back side of the diaphragm.
[0051]
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14
In both FIGS. 5 and 6, a curve indicated by a solid line A is a sound pressure frequency
characteristic of 2 m on the axis when the speaker is housed in a small cabinet and an input of 1
W is applied. The curves of dotted line B are all directivity characteristics of 2 m 30 °.
[0052]
It can be seen from FIG. 5 that although the reproduction frequency band extends to less than 20
kHz on the axis in the conventional loudspeaker, the 30 ° directivity characteristic largely
attenuates in the high region and the directivity characteristic in the high region is bad. On the
other hand, from FIG. 6, in the loudspeaker according to the second embodiment, not only the
reproduction frequency band extends to 20 kHz on the axis, but also the attenuation of the 30 °
directivity is extremely small and the directivity in the high region is extremely high. It turns out
that it is excellent.
[0053]
Moreover, when FIG. 5 and FIG. 6 are compared, it turns out that distortion of the characteristic
of 1.5 kHz-4 kHz is smaller than the conventional speaker, and the speaker of this Embodiment 2
is improved to the characteristic of middle-high range.
[0054]
Furthermore, since the speaker according to the second embodiment does not need to be
provided with a braking member separately, the cost increase can be suppressed to a very small
amount.
This is an edge pasting margin 17a extended to the vicinity of the outer peripheral edge of the
corrugation 15a, which is a portion originally discarded at the time of inside diameter removal of
edge mass production, and new material cost due to the extended edge pasting margin 17a It is
because you do not need it.
[0055]
Therefore, in addition to the effects described in the first embodiment, the loudspeaker according
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15
to the second embodiment can minimize the cost increase by configuring as described above.
Furthermore, in the second embodiment, since the edge pasting portion 17a is provided on the
front side of the diaphragm 15, it is possible to suppress fine unnecessary vibration due to the
skin effect of the diaphragm material in the middle or high band.
[0056]
In addition, the appearance design of the speaker can be made unique and beautiful. In other
words, the diaphragm 2 is as high as the diaphragm for high-pitched sound than the corrugation
15a, and the edge pasting portion 17a on the outer peripheral side than the corrugation 15a
looks like a diaphragm for low-pitched sound. It is suitable to express the effect image of And in
this Embodiment 2, since it is not necessary to use a separate damping member, the kind of
material which can be seen from front side in appearance can be reduced, and appearance design
processing becomes easy.
[0057]
In the second embodiment, the material of the edge 17 is a rubber coated cloth, but various
rubbers, urethane foams, etc. may be used. As the material with a large internal loss is used, the
effect of improving the characteristics in the middle to high range is increased, but since a
general cloth edge material contains a phenol resin and a rubber component, a constant effect
can be obtained. In addition, since the ratio of the mass per unit area of the diaphragm 15 on the
inner peripheral side and the outer peripheral side of the corrugation 15a becomes larger as the
thickness of the diaphragm 15 is reduced, the effect of reducing the effective vibration area in
the high region is obtained. Get higher.
[0058]
In the second embodiment, the end of the inner peripheral edge of the edge-sticking portion 17a
is extended from the outer peripheral edge of the corrugation 15a to a distance of 1 mm, but this
distance can be made wider. However, if this interval is made too wide, the damping effect of the
edge pasting margin 17a decreases too much, so the area of the edge pasting margin 17a can be
within a range of half or more of the area of the diaphragm 15 outside the outer periphery of the
corrugation 15a. It is desirable to do.
12-05-2019
16
[0059]
On the other hand, if this interval is too narrow, when mass-producing diaphragms with edges,
the edge pasting margin 17a runs on the corrugation 15a due to the misalignment between the
diaphragm 15 and the edge 17, and the difference between the left and right spacing Since the
appearance is unsightly, the distance of 1 mm is not too wide. Needless to say, the present
invention is not limited to the examples described above.
[0060]
Third Exemplary Embodiment Next, a loudspeaker according to a third exemplary embodiment of
the present invention will be described with reference to FIG. FIG. 7 is a block diagram of a
speaker in the third embodiment of the present invention. In FIG. 7, the frame 22, the voice coil
23, the damper 24, and the dust cap 26 are the same as in the first embodiment described above,
and thus the description thereof is omitted.
[0061]
The third embodiment is different from the first embodiment in the diaphragm 25, the
corrugation 25a, the edge 27, and the adhering part 27a of the edge to the diaphragm 25. The
material of the diaphragm 25 is pulp having a thickness of about 0.3 mm. The inner diameter
and the outer diameter of the diaphragm 25 are the same as those of the first embodiment, but
the corrugation 25a has a stepped shape. The inner peripheral diameter of the corrugation 25a is
36 mm, the outer peripheral diameter is 38 mm, and the step height is 0.7 mm.
[0062]
The material of the edge 27 is a foamed rubber having a thickness of 0.5 mm. As in the first
embodiment, the dimensions of the roll portion of the edge 27 are 58 mm in outer peripheral
diameter and 48 mm in inner peripheral diameter of the roll portion. That is, the effective
vibration diameter is 53 mm, and the total effective vibration area is about 22 cm <2> as in the
loudspeaker of the first embodiment.
12-05-2019
17
[0063]
The adhesive film portion 27a for the diaphragm 25 is provided on the back surface of the
diaphragm 25, and the diameter of the inner peripheral edge is 39 mm. That is, as in the second
embodiment, it is extended to the vicinity of the outer peripheral edge of the corrugation 25a.
And the edge pasting margin part 27a is used as a braking member. Needless to say, the material
of the edge pasting margin 27a is the same foamed rubber cloth as the edge 27. The effective
vibration area on the inner peripheral side of the inner peripheral edge of the corrugation 25a is
about 10 cm <2>, which is about half or less of the total effective vibration area.
[0064]
By being configured as described above, the speaker of the third embodiment has exactly the
same function and effect as the first embodiment. That is, since the edge sticking margin 27a
operates as a braking member, the same effect as described in the first embodiment can be
obtained. Moreover, since the speaker of the third embodiment does not need to have a separate
braking member as in the second embodiment, the cost increase can be suppressed to a very
small amount. Further, in the third embodiment, the edge pasting margin 27a is provided on the
back side of the diaphragm 25a so that the edge pasting margin 27a can not be seen from the
front side of the speaker.
[0065]
Fourth Embodiment FIG. 8 is a block diagram of a speaker in a fourth embodiment of the present
invention. In FIG. 8, the aperture diameter of this speaker is 6.5 cm, which is a dome-shaped fullrange speaker. The configurations of the field unit 31, the frame 32, the voice coil 33, and the
damper 34 are the same as in the first embodiment, and therefore the description thereof is
omitted.
[0066]
In the fourth embodiment, the material of the diaphragm 35 is aluminum having a thickness of
0.1 mm, and the outer diameter is 47 mm, which is a dome shape. The cross-sectional shape of
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the corrugation 35 a is approximately 1⁄3 concave arc, and the cross-sectional radius of
curvature is about 0.7 mm. The outer peripheral diameter of the corrugation 35a is 35 mm, and
the inner peripheral diameter is 33 mm.
[0067]
The material of the edge 37 is foamed rubber having a thickness of 0.5 mm, the outer peripheral
diameter of the roll portion is 58 mm, and the inner peripheral diameter of the roll portion is 48
mm. That is, the effective vibration diameter is 53 mm, and the total effective vibration area of
the speaker of the fourth embodiment is about 22 cm <2>. The pasting margin 37a of the edge
37 to the diaphragm 35 is provided on the front side of the diaphragm 35, and the inner
peripheral diameter thereof is 36 mm. That is, it extends to the vicinity of the outer peripheral
edge of the corrugation 35a. Then, the edge pasting margin portion 37a is used as a braking
member. Needless to say, the material of the edge pasting margin portion 37 a is the same foam
rubber as the edge 37. The effective vibration area on the inner peripheral side of the inner
peripheral edge of the corrugation 35a is about 8.5 cm <2>, which is about half or less of the
total effective vibration area.
[0068]
By being configured as described above, the speaker of the fourth embodiment has exactly the
same function and effect as the first embodiment. That is, since the edge sticking margin portion
37a operates as a braking member, the same effect as described in the first embodiment can be
obtained. Further, since the speaker of the fourth embodiment does not need to have a separate
braking member as in the second embodiment, the cost increase can be suppressed to a very
small amount.
[0069]
According to the speaker of the present invention, the reproduction frequency band in the high
frequency band is broadened, and in particular, the directivity in the high frequency band is
broadened, and excellent high frequency band characteristics can be obtained. Furthermore,
excellent middle and high frequency characteristics can also be obtained. Therefore, it is for
sound reproduction of all kinds of electronic equipment such as audio reproduction equipment
for television, car sound reproduction equipment, built-in sound reproduction equipment for
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personal computer, portable sound reproduction equipment as well as general 2 channel stereo
sound reproduction equipment and multichannel sound reproduction equipment. Useful for As
described above, the speaker of the present invention is extremely high in practical value.
[0070]
The structure of the speaker in Embodiment 1 of this invention is shown, (a) The figure is the
sectional view, (b) is the same front view The symbol explanatory drawing of the electroacoustic
equivalent circuit of the speaker in Embodiment 1 of this invention Electro-acoustic equivalent
circuit diagram of the speaker according to the first embodiment of the invention Sectional view
showing the configuration of the speaker according to the second embodiment of the present
invention Frequency characteristic diagram of the conventional speaker Frequency characteristic
diagram of the speaker according to the second embodiment of the present invention A crosssectional view showing the configuration of the speaker according to the third embodiment of
the invention A cross-sectional view showing the configuration of the speaker according to the
fourth embodiment of the present invention A cross-sectional view showing the configuration of
a conventional speaker Electro-acoustic equivalent circuit diagram of a conventional speaker
Explanation of sign
[0071]
DESCRIPTION OF SYMBOLS 1 field part 2 frame 3 voice coil 4 damper 5 diaphragm 5 a
corrugation 6 dust cap 7 edge 8 damping member
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