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JPH0619395

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH0619395
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention stops
secondary resonance and improves directivity characteristics, and is particularly required for
high definition sound quality such as television speakers and PA speakers (in-field loudspeakers)
The present invention relates to a diaphragm for flat speaker suitable for
[0002]
2. Description of the Related Art Conventionally, various flat dynamic speakers have been
proposed, but it is difficult to remove split resonance peculiar to a flat plate, and the structure for
removing this split resonance becomes complicated, in any case. It is expensive and not widely
used.
[0003]
In addition, in order to remove the secondary resonance in the prior art, node driving is often
performed.
[0004]
Although the prior art for removing the second resonance has the effect of removing the second
resonance, it has an effect of eliminating the second resonance, but on the other hand, because
the drive diameter becomes large, Deteriorated
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1
[0005]
The present invention has been made in view of the above-described circumstances, and an
object thereof is to provide a diaphragm for a flat speaker which can eliminate the second
resonance and improve the directivity in the high frequency range. It is said that.
[0006]
SUMMARY OF THE INVENTION In order to achieve the above object, according to the present
invention, on the back surface 8b side of the flat diaphragm 8, the addition position of the weight
15 is in the radial direction of the diaphragm 8. Assuming that the effective diameter of the
diaphragm 8 is A and the addition position of the weight 15 is B, the center of gravity of the
diaphragm 8 in the back and forth direction of the diaphragm 8 is B / A = 0.7-0.9. In the vicinity,
at least four points at equal intervals in the circumferential direction of the diaphragm 8 and the
total weight of the weight 15 is 0.2 to 1.0 times the weight of the diaphragm 8 It is set.
[0007]
In the present invention, assuming that the additional position of the weight 15 is A, and the
effective diameter of the diaphragm 8 is A in the radial direction of the diaphragm 8 and B is the
additional position of the weight 15, B / A = It is set at a position of 0.7 to 0.9 and in the vicinity
of the center of gravity of the diaphragm 8 in the front-rear direction of the diaphragm 8, which
is the optimum position for removing the second resonance.
[0008]
Further, since the addition position of the weight 15 is set at 4 to 16 places at equal intervals in
the circumferential direction of the diaphragm 8, an optimum position is also obtained for the
high-order resonance mode.
[0009]
Furthermore, the total weight of the weight 15 is set to 0.2 to 1.0 times the weight of the
diaphragm 8, and the total weight of the weight 15 is also the optimum weight for removing the
second resonance.
[0010]
As a result, in the present invention, it is possible to effectively remove the second resonance,
and it is possible to significantly improve the directivity in the high range.
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2
[0011]
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing an embodiment of a speaker using a diaphragm
according to the present invention, and FIG. 2 is a rear view of the diaphragm.
[0012]
The loudspeaker shown in FIG. 1 comprises an inverted T-shaped yoke 1, a ring-shaped magnet 2
fixed on the flange of the yoke 1, a plate 3 fixed on the magnet 2, and A frame 4 fixed on the
plate 3 through the bottom, a diaphragm 8 attached to the top of the frame 4 through the edge 9,
and a magnetic gap between the center pole of the yoke 1 and the magnet 2 and the plate 3 The
voice coil 5 disposed inside, the voice coil bobbin 6 supporting the voice coil 5 and supported by
the diaphragm 8, the damper provided between the outer periphery of the voice coil bobbin 6
and the inner periphery of the frame 4 And 7 are configured.
[0013]
The vibrating plate 8 is formed in a round plate shape using a foam material such as styrene.
The front surface 8a side of the diaphragm 8 is formed flat, and the throat portion 10, the
reinforcing ribs 11a and 11b, the weight reduction holes 12a and 12b, the outer peripheral
portion hole 13, and the weight are formed on the back surface 8b. And 15 are provided.
[0014]
The throat portion 10 is formed in a frusto-conical shape.
The reinforcing rib 11 a is formed in the throat portion 10 in an annular shape concentric with
the diaphragm 8.
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The reinforcing rib 11 b is formed in an annular shape concentric with the diaphragm 8 near the
outer peripheral portion of the diaphragm 8.
The weight reduction holes 12 a are formed in an annular shape between the reinforcing ribs 11
a in the throat portion 10.
The weight reduction holes 12 b are formed by arranging triangular holes in a back-to-back
manner between the reinforcing ribs 11 b near the outer periphery of the diaphragm 8.
The outer peripheral hole 13 of the diaphragm 8 is formed by arranging a triangular hole slightly
larger than the weight reduction hole 12b on the circumference in a back-to-back manner.
[0015]
By the way, the present invention is characterized in that a weight 15 having a set weight is
added to a setting position on the back surface 8b side of the diaphragm 8, and the addition
position of the weight 15 is the diaphragm 8. In the radial direction of the diaphragm 8 as shown
in FIG. 1, assuming that the effective diameter is A and the addition position of the weight 15 is
B, the front-rear direction of the diaphragm 8 (B / A = 0.7-0.9) Arrows c) in FIG. 1 are added at 4
to 16 places in the vicinity of the center of gravity of the diaphragm 8 at equal intervals in the
circumferential direction of the diaphragm 8, and the total weight of the weight 15 is vibration It
is set to 0.2 to 1.0 times the weight of the plate 8.
[0016]
In this embodiment, a weight 15 is attached using the outer peripheral hole 13.
That is, as shown in FIG. 2, the mounting base 14 provided with the weight 15 is fitted in the
eight outer peripheral holes 13 selected at intervals of 45 ° on the circumference, and the arrow
c in FIG. It is fixed after adjusting the position in the front and back direction shown by.
The mounting base 14 of the weight 15 is formed of the same foam material as the diaphragm 8
into a short triangular prism fitted in the outer peripheral hole 13, and is adhered and fixed to
the diaphragm 8.
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The weight 15 may be made of metal, plastic, rubber or the like, but using butyl rubber for highorder resonance modes produced a good effect.
[0017]
Further, in this embodiment, the effective diameter A of the diaphragm 8 is formed 2.0 to 3.0
times the diameter of the voice coil 5, and the height of the throat 10 is about 0 of the diameter
of the voice coil 5. It is formed 0.5 to 1.5 times.
[0018]
Further, in this embodiment, at a position 0.5 to 0.8 times the effective diameter A of the
diaphragm 8 on the back surface 8b side of the diaphragm 8, the thickness of the diaphragm 8 is
1.8 to 2. A reinforcing rib 11b five times as high is provided.
[0019]
As described above, in the diaphragm for a flat speaker of this embodiment to which the weight
15 is added, since the weight 15 is adjusted to the optimum position and adjusted to the
optimum weight and added, the second resonance is generated. It can be effectively removed and
can be effectively tuned to higher-order resonance modes.
[0020]
By the way, FIG. 4 is a diagram showing the directivity characteristic of a conventional speaker
using a diaphragm of 16 cm cone type, and FIG. 5 is a flat-plate round shaped weight in the
embodiment shown in FIG. 1 and FIG. It is a figure which shows the directional characteristic of
the speaker which used the 16 cm diaphragm made.
From these FIGS. 4 and 5, it can be seen that the directivity characteristics in the high range are
significantly improved according to this embodiment of the present invention.
[0021]
Further, in this embodiment, the effective diameter A of the diaphragm 8 is formed 2.0 to 3.0
times the diameter of the voice coil 5, and the height of the throat 10 is about 0 of the diameter
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5
of the voice coil 5. Since it is formed by 5 to 1.5 times, the difference in distance from the surface
of the diaphragm 8 to the measurement position is small compared to a speaker using a
diaphragm of the cone type generally used in the prior art. The directivity characteristics in the
range can be greatly improved.
[0022]
Furthermore, in this embodiment, at a position 0.5 to 0.8 times the effective diameter A of the
diaphragm 8 on the back surface 8b side of the diaphragm 8, the thickness of the diaphragm 8 is
1.8 to 2. A reinforcement rib 11b having a height of 5 times is provided, and a large number of
holes 12b and 13 are opened on the outer peripheral portion side of the diaphragm 8 including
between the reinforcement ribs 11b to make the structure lightweight and having a large
internal loss. Therefore, higher order resonance can also be improved.
[0023]
FIG. 3 is a partially enlarged sectional view showing another embodiment of the present
invention.
In the embodiment shown in FIG. 3, a free edge 16 separate from the diaphragm 8 is attached to
the upper end of the frame 4, and the diaphragm 8 is supported by the frame 4 via the free edge
16. There is.
[0024]
The other construction and operation of the embodiment shown in FIG. 3 are the same as those
of the embodiment shown in FIGS. 1 and 2.
[0025]
In the present invention, the weight reduction holes 12b provided on the outer peripheral
portion of the diaphragm 8 and the outer peripheral holes 13 are not limited to the triangles
shown in FIG. 2, but may be circular or square.
Also, the way of adding the weight 15 is not limited to the method of fitting the mounting base
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14 into the outer peripheral portion hole 13, and may be directly attached to a predetermined
position of the diaphragm 8.
[0026]
As described above, in the present invention, on the rear side of the flat diaphragm, the weight
application position is A, and in the radial direction of the diaphragm, the effective diameter of
the diaphragm is A, Assuming that the additional position of the weight is B, B / A = 0.7 to 0.9, in
the back and forth direction of the diaphragm in the vicinity of the center of gravity of the
diaphragm, and at equal intervals in the circumferential direction of the diaphragm. In addition to
setting the weight at least at four locations, the total weight of the weight is set to 0.2 to 1.0
times the weight of the diaphragm, and the mounting position of the weight eliminates secondary
resonance. Position, and also for the higher-order resonance mode, and the total weight of the
weight is adjusted to the optimum weight to eliminate the second resonance, so the second
resonance is made effective and appropriate. It has an effect that can be An effect that can
significantly improve.
[0027]
Brief description of the drawings
[0028]
1 is a longitudinal sectional view showing an embodiment of the present invention.
[0029]
2 is a back view of the diaphragm used in the embodiment of FIG.
[0030]
FIG. 3 is a partially enlarged sectional view showing another embodiment of the present
invention.
[0031]
FIG. 416 is a directional characteristic diagram of a conventional loudspeaker using a cone-type
diaphragm.
[0032]
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FIG. 516 is a directional characteristic diagram using the circular plate flat plate of the present
invention diaphragm.
[0033]
Explanation of sign
[0034]
Reference Signs List 1 yoke 2 magnet 3 plate 4 frame 5 voice coil 6 voice coil bobbin 7 damper 8
diaphragm 8b diaphragm back surface 10 throat portions 11a and 11b reinforcing ribs 12a and
12b weight saving hole 13 outer peripheral hole 14 weight mounting base 15 weights
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