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JPH08251691

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH08251691
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker unit used for various audio equipment.
[0002]
2. Description of the Related Art Conventionally, there is a speaker unit 21 having a so-called
discrete edge type structure, in which an edge is fixed inside an outer peripheral edge of a
diaphragm and the edge is covered with the diaphragm. The configuration and operation of the
speaker unit 21 will be described below with reference to FIGS. 3 and 14 to 16.
[0003]
As shown in FIG. 14, in the speaker unit 21, the frame 23 is coupled to the upper surface of the
magnetic circuit 22 holding the ring-shaped magnet 32 between the lower plate 30 having the
center pole 30 a and the ring-shaped upper plate 31. It is done. Further, a damper 29 is fixed to
the frame 23 so as to hold an intermediate portion of the voice coil 27 so that the lower portion
of the voice coil 27 fits into the magnetic gap 28 of the magnetic circuit 22 without eccentricity.
[0004]
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The outer peripheral portion of the diaphragm 25 is fixed to the frame 23 together with the
gasket 26 via the edge 24, while the inner peripheral portion of the diaphragm 25 is connected
to the upper portion of the voice coil 27. The diaphragm 25 has a shape in which the outer
peripheral portion is enlarged so as to cover the radiation surface of the edge 24. Furthermore, a
cap 33 is fixed to the center front of the diaphragm 25. Further, as shown in FIG. 15, the
attachment of the edge 24 to the diaphragm 25 is performed by an adhesive margin 24a
extending in the center direction of the diaphragm 25.
[0005]
The shape of the diaphragm 25 is substantially the same as that of the diaphragm 5 of FIG. 3
used in Example 1 described later.
[0006]
The operation of the speaker unit 21 configured as described above will be briefly described.
First, when an input signal (current) to be reproduced is applied to the voice coil 27, it receives a
magnetic field from the magnetic circuit 22, and the voice coil 27 receives a force according to
the law of Fleming's left hand, and is displaced in the axial direction. The amount of displacement
changes due to fluctuations in the magnitude of the current value and the frequency. As a result,
the voice coil 27 and the diaphragm 25 connected to the voice coil 27 vibrate at a frequency
according to the input signal, and sound is emitted from the diaphragm 25 into the air.
[0007]
In the above speaker unit 21, since the edge 24 is covered by the diaphragm 25, it is possible to
block the radiation sound from the edge 24 and reproduce only the radiation sound from the
diaphragm 25. Further, as a result of incorporating the edge 24, the height of the speaker unit 1
can be reduced, and the size of the diaphragm 25 can be increased to the limit when a frame of
the same size is used. Suitable for use in places where space is limited. Furthermore, in the case
of the speaker system, only the diaphragm 25 and the cap 33 can be seen from the outside, so it
has a very clean appearance and matches without disturbing harmony with any design. It has
become a thing.
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[0008]
However, in the discrete edge type speaker unit, the inner diameter of the edge 24 is small, so
the strength in the circumferential direction is reduced, and low frequency distortion occurs due
to bending resonance, or it is made free end at split resonance. The high frequency distortion
generated from the outer peripheral edge portion of the diaphragm 25 may disturb the
frequency characteristics or, in a severe case, may cause a defect such as generation of an
abnormal sound called surface noise. For example, although an example of the sound pressure
characteristic of the speaker shown in FIG. 15 is shown in FIG. 16, a drop of the sound pressure
level near 2 kHz is observed in this speaker.
[0009]
This effect is remarkable particularly when the diaphragm is reduced in weight for the purpose
of improving the sound pressure level or raising the resonance frequency.
[0010]
Therefore, in JP-A-6-125594, as shown in FIG. 17, a configuration in which corrugations 34a of
cross-sectional waveform are radially formed on the outer peripheral portion of the diaphragm
34 is disclosed. It is disclosed that the rising portion 35a and the flat flange 35b are provided
near the outer periphery of the diaphragm 35 as shown in FIG. 19 and the rising portion 36a and
the roll flange 36b are provided on the diaphragm 36 as shown in FIG. It is done.
The above publication discloses a configuration that suppresses disturbance of frequency
characteristics due to split resonance or bending resonance by improving rigidity in the axial
direction or circumferential direction in the outer peripheral portion of the diaphragm to
increase the resonance frequency.
[0011]
However, in the above configuration, since the shape of the reinforced portion appears on the
surface of the diaphragm, the speaker system also has an appearance matching the shape of the
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diaphragm on the premise thereof You will need to design. That is, there is a problem that the
shape of the diaphragm is restricted, and the degree of freedom in designing the appearance is
greatly restricted.
[0012]
Therefore, when designing with a priority given to the appearance of the speaker system, the
rigidity of the diaphragm can not be secured, and unnecessary resonance occurs at the outer
peripheral portion of the diaphragm to disturb the sound pressure characteristics or surface
noise. Or reduce the sound pressure level to avoid the above.
[0013]
On the other hand, when designing with priority given to sound pressure characteristics and
frequency characteristics using the speaker unit disclosed in, the speaker system is designed
according to the appearance of the speaker unit resulting from securing the rigidity of the
diaphragm. Not only in terms of price and performance but also in terms of design, the
appearance of the speaker unit restricts the design of the speaker system in the current situation
where sales will be influenced by the design It is not desirable that you
Further, in the configuration of (1), since the strength is obtained by the rising portions 35a and
36a, there is also a problem that the height of the speaker unit has to be increased.
[0014]
An object of the present invention is to provide a speaker unit for realizing good frequency
characteristics and sound pressure characteristics without affecting the appearance of a speaker
unit used for various audio devices.
[0015]
In order to solve the above-mentioned problems, the speaker unit according to the first aspect of
the present invention connects the edge to the inside of the outer peripheral edge of the back
surface of the diaphragm, and the edge by the outer peripheral edge. In the speaker unit in which
the cover is covered, an adhesive margin between the diaphragm and the edge is formed on the
outer peripheral side.
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[0016]
The speaker unit of the invention according to claim 2 is an outer peripheral side than a position
where the edge is connected in the speaker unit in which the edge is connected to the inside
from the outer peripheral edge of the back surface of the diaphragm and the edge is covered by
the outer peripheral edge. A rib integrally formed with the diaphragm is provided on the back of
the panel so as to protrude.
[0017]
According to the construction of the first aspect of the invention, since the bonding margin
between the edge and the diaphragm is provided on the outer peripheral side of the diaphragm,
the diaphragm is not specially processed for reinforcement. Even in this case, the adhesive
margin acts as a reinforcing member for the outer peripheral portion of the diaphragm.
Therefore, even if the weight of the diaphragm is reduced to improve the input resistance and the
sound pressure level, the rigidity of the diaphragm is secured by reinforcing the outer peripheral
portion, so that the sound pressure characteristics and the frequency characteristics are
disturbed or surface noises It can be suppressed.
Moreover, since the appearance of the front side of the diaphragm is not affected, the
appearance of the speaker unit hardly affects the design as the speaker system, and there are few
restrictions on the degree of freedom in design, which is compact and sound pressure
characteristics The speaker unit is excellent in any of the frequency characteristics.
[0018]
Further, according to the configuration of the second aspect, since the rib projecting on the back
surface of the diaphragm integrally formed with the diaphragm is provided, the outer peripheral
portion of the diaphragm is not affected on the shape of the surface of the diaphragm. It is
possible to reinforce the
Therefore, as in the first aspect, even if the design is given priority to the appearance or the
weight of the diaphragm is reduced to improve the sound pressure level, the rigidity of the
diaphragm can be secured by reinforcing the diaphragm outer peripheral portion. The speaker
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unit is capable of suppressing sound pressure characteristics, disturbances of frequency
characteristics, surface noises and the like, so there are few restrictions on freedom in design,
and a speaker unit that is compact and excellent in both sound pressure characteristics and
frequency characteristics It can be done.
[0019]
In particular, when radial ribs are provided on the outer peripheral portion of the diaphragm,
axial division resonance is suppressed, and in the case where circumferential ribs are provided
on the outer peripheral portion of the diaphragm, bending in the circumferential direction is
achieved. Suppress resonance. Thereby, reverse resonance of the diaphragm outer peripheral
portion can be suppressed. Of course, when the radial ribs and the circumferential ribs are
provided at the same time, both split resonance and bending resonance are suppressed, and
further improvement of the effect of the above-mentioned reverse resonance suppression can be
expected.
[0020]
[Embodiment 1] The following description will explain another embodiment of the present
invention, while referring to FIGS. 1 to 3. FIG.
[0021]
As shown in FIG. 2, the speaker unit 1 according to this embodiment has a frame on the top
surface of the magnetic circuit 2 in which the ring-shaped magnet 12 is held between the lower
plate 10 having the center pole 10a and the ring-shaped upper plate 11. 3 are combined.
[0022]
Further, the damper 9 is fixed to the frame 3 while holding the middle portion of the voice coil 7
so that the lower portion of the voice coil 7 fits into the magnetic gap 8 of the magnetic circuit 2
without eccentricity.
[0023]
The outer peripheral portion of the diaphragm 5 is fixed to the frame 3 together with the gasket
6 via the edge 4, while the inner peripheral portion of the diaphragm 5 is connected to the upper
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portion of the voice coil 7.
The diaphragm 5 is a so-called discrete edge type speaker unit in which the outer peripheral
portion is enlarged so as to cover the radiation surface of the edge 4.
Further, a cap 13 for preventing adsorption of dust and the like is fixed to the center front of the
diaphragm 5.
[0024]
As shown in FIG. 3, the diaphragm 5 has almost no difference in shape from the diaphragm used
in the conventional discrete edge type speaker unit.
[0025]
An end view of the outer peripheral portion of the speaker unit 1 is shown in FIG. 1, but the edge
4 is attached inside the outer peripheral edge of the diaphragm 5, and the bonding margin 4 a of
the edge 4 and the diaphragm 5 is the edge 4 It can be seen that it covers from the mounting
portion to the outer peripheral edge.
That is, by acting as a member that reinforces the outer peripheral portion of the diaphragm, the
adhesive margin 4a is less likely to cause disturbance of the frequency characteristic
accompanying weight reduction of the diaphragm for improving the sound pressure
characteristic, and the diaphragm itself Because there is no need to process for reinforcement,
there is no change in appearance and there are few design restrictions.
[0026]
As a result, it is possible to provide a speaker unit which is excellent in sound pressure
characteristics and frequency characteristics and has a high degree of freedom in the design of
the appearance.
[0027]
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[Embodiment 2] The following description will explain another embodiment of the present
invention, while referring to FIGS.
For convenience of explanation, the same reference numerals are appended to members having
the same functions as the members shown in the drawing of the first embodiment, and the
description thereof will be omitted.
[0028]
The speaker unit 14 of this embodiment is the same as the speaker unit of the first embodiment
except that the shape of the edge 4 and the shape of the diaphragm 15 are different as shown in
FIG.
[0029]
An end view of the outer peripheral portion of the speaker unit 14 is shown in FIG.
In the present embodiment, the adhesive margin 4a of the edge 4 is provided on the inner
peripheral side as in the conventional case, and protrudes from the attachment portion of the
edge 4 to the outer peripheral portion toward the outer peripheral portion toward the back
surface side of the diaphragm 15. The radial rib 15a is provided.
As shown in FIG. 6, a total of five locations are provided at positions equally dividing the
circumferential direction into five as shown in FIG. 6. However, if the number, dimensions, etc. of
the radial ribs 15a are appropriately set according to the output of the speaker unit, the size, etc.
Good. Thus, the rigidity in the axial direction of the diaphragm 15 can be improved, and the
resonance frequency at the time of split resonance can be increased.
[0030]
As a result, it is possible to provide a speaker unit which is excellent in sound pressure
characteristics and frequency characteristics and has a high degree of freedom in the design of
the appearance.
[0031]
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[Third Embodiment] The following description will explain another embodiment of the present
invention, while referring to FIGS. 7 to 9. FIG.
For convenience of explanation, the same reference numerals are appended to members having
the same functions as the members shown in the drawings of the first and second embodiments,
and the description thereof will be omitted.
[0032]
The speaker unit 16 of this embodiment is the same as the speaker unit of the second
embodiment except that the shape of the rib provided on the diaphragm 17 is different as shown
in FIG.
[0033]
An end view of the outer peripheral portion of the above speaker unit 16 is shown in FIG. 8. Two
of the circumferential ribs 17a ии which protrude from the attachment portion of the edge 4
toward the outer peripheral side of the diaphragm 4 and have different diameters. 17b is
provided.
The circumferential ribs 17a and 17b are formed concentrically with the diaphragm 17 as shown
in FIG. 9, but the number, dimensions, etc. of the circumferential ribs 17a and 17b may be
appropriately set depending on the output of the speaker unit, the size, etc. Just do it. Thereby,
the rigidity in the circumferential direction of the diaphragm 17 can be improved, so that the
resonance frequency at the bending resonance can be increased.
[0034]
As a result, it is possible to provide a speaker unit that is excellent in sound pressure
characteristics and frequency characteristics and has a high degree of freedom in appearance
design.
[0035]
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[Embodiment 4] The following description will explain another embodiment of the present
invention, while referring to FIG. 10 to FIG.
For convenience of explanation, the same reference numerals are appended to members having
the same functions as the members shown in the drawings of the first and second embodiments,
and the description thereof will be omitted.
[0036]
As shown in FIG. 10, the speaker unit 18 of this embodiment is the same as the speaker unit of
the second embodiment except that the shape of the diaphragm 19 is different.
[0037]
An enlarged view of the outer peripheral portion of the above speaker unit 18 is shown in FIG.
11. However, circumferential ribs 19a and 19b and radial ribs 19c are projected on the back side
of the diaphragm in the outer peripheral direction side from the attachment portion of the edge
4. It is provided.
As shown in FIG. 12, the circumferential ribs 19a and 19b are formed concentrically with the
diaphragm 19, and the radial ribs 19c are provided at a total of five positions at which the
concentric circles are equally divided into five. However, the number, dimensions, and the like of
the ribs described above may be appropriately set according to the output, size, and the like of
the speaker unit. Thereby, the rigidity in the axial direction and the circumferential direction of
the diaphragm 19 can be improved, so that the resonance frequency at the time of divided
vibration or bending vibration can be increased.
[0038]
As a result, it is possible to make the speaker unit excellent in sound pressure characteristics and
frequency characteristics and good in design.
[0039]
A comparison is made between the sound pressure characteristics of the conventional product
shown in FIG. 16 and the sound pressure characteristics shown in FIG. 13 measured using the
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speaker unit manufactured by applying the configuration shown in Example 1 to the
conventional product. Then, in the loudspeaker according to the present embodiment, it is
understood that the sound pressure level near 2 KHz is improved as compared with the
conventional product.
[0040]
In addition, since the improvement data of the sound pressure characteristic substantially the
same as the above with respect to the sound pressure characteristic of the conventional product
are obtained, the results of the other examples are representatively shown only for the
measurement results of the first embodiment. The
[0041]
In the above embodiment, when the rigidity in the axial direction is improved, the resonance
frequency at the time of divided vibration is increased, so abnormal noise such as surface noise
due to divided resonance or the like is hard to occur, and the input resistance The high frequency
characteristics of the reproduction frequency can be improved, and when the rigidity in the
circumferential direction is improved, the resonance frequency at the time of bending vibration
becomes high, so that low frequency distortion can be suppressed. As described above, it is
possible to improve the sound pressure characteristics and the frequency characteristics without
changing the appearance of the conventional speaker unit.
[0042]
As described above, the speaker unit according to claim 1 of the present invention has the edge
connected inside the outer peripheral edge of the back surface of the diaphragm, and the edge is
covered by the outer peripheral edge. In the above, the bonding margin between the diaphragm
and the edge is formed on the outer peripheral side.
[0043]
Therefore, this does not require a special configuration on the diaphragm side, improves the
rigidity of the outer peripheral portion, raises the resonance frequency, suppresses split
resonance and bending resonance, and changes the appearance. Since this is not accompanied,
the sound pressure characteristic and the frequency characteristic can be improved even if
priority is given to the appearance as a speaker system.
[0044]
In the speaker unit according to claim 2 of the present invention, the edge is connected to the
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inside of the outer peripheral edge of the back surface of the diaphragm and the edge is
connected by the outer peripheral edge. A rib integrally formed with the diaphragm is provided
on the outer surface of the outer peripheral side so as to protrude therefrom.
[0045]
Therefore, as in the first aspect of the invention, the rigidity of the outer peripheral portion can
be improved without any change in appearance.
[0046]
Brief description of the drawings
[0047]
1 is an enlarged end view of the diaphragm outer peripheral portion of the speaker unit
according to an embodiment of the present invention.
[0048]
2 is a cross-sectional view of a speaker unit according to an embodiment of the present
invention.
[0049]
3 is a view of the diaphragm used for the speaker unit in FIG. 2 viewed from the back.
[0050]
4 is a cross-sectional view of a speaker unit according to another embodiment of the present
invention.
[0051]
5 is an enlarged end view of the diaphragm outer peripheral portion of the speaker unit in FIG.
[0052]
6 is a view of the diaphragm used for the speaker unit in FIG. 4 viewed from the back.
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[0053]
7 is a cross-sectional view of a speaker unit according to another embodiment of the present
invention.
[0054]
8 is an enlarged end view of the diaphragm outer peripheral portion of the speaker unit in FIG.
[0055]
9 is a view of the diaphragm used for the speaker unit in FIG. 7 viewed from the back.
[0056]
10 is a cross-sectional view of a speaker unit according to another embodiment of the present
invention.
[0057]
11 is an enlarged end view of the diaphragm outer peripheral portion of the speaker unit in FIG.
[0058]
12 is a view of the diaphragm used for the speaker unit in FIG. 10 viewed from the back side.
[0059]
13 is a diagram showing the frequency characteristics in Example 1;
[0060]
14 is a cross-sectional view of a conventional speaker unit.
[0061]
15 is an enlarged end view of the diaphragm outer peripheral portion of the speaker unit in FIG.
[0062]
16 is a diagram showing the frequency characteristics of the speaker unit in FIG.
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[0063]
17 is a partial sectional view showing a diaphragm in the other conventional speaker unit.
[0064]
18 is an enlarged end view showing the outer peripheral portion of the diaphragm in still
another conventional speaker unit.
[0065]
19 is an enlarged end view showing the outer peripheral portion of the diaphragm in the other
conventional speaker unit.
[0066]
Explanation of sign
[0067]
DESCRIPTION OF SYMBOLS 1 speaker unit 2 magnetic circuit 3 frame 4 edge 4a bonding margin
5 diaphragm 15 diaphragm 15a radial rib 17 diaphragm 17a circumferential rib 17b
circumferential rib 19 diaphragm 19a circumferential rib 19b circumferential rib 19c radial rib
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