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JPS58137400

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DESCRIPTION JPS58137400
[0001]
The present invention relates to an electrodynamic speaker using a rectangular flat diaphragm,
and an object of the invention is to provide an electrodynamic speaker capable of simultaneously
reducing distortion and rolling phenomenon. Generally, as shown in FIG. 1, an electrodynamic
loudspeaker using a rectangular flat diaphragm is supported on the outer periphery of the
rectangular flat diaphragm 1 by a frame 3 via an edge member 2. It is configured to vibrate up
and down by being attached to the field section and the voice coil. The support of the vibration
system needs to support the vibration system at the correct position and to elastically support it
with appropriate softness so that the vibration system can move linearly with respect to the
electrical signal or the acoustic signal. In particular, in the case of an electrodynamic loudspeaker
having a rectangular flat diaphragm, the lowest resonance frequency 10 of the vibration system
is increased due to the characteristics of the edge member that elastically supports the
rectangular flat diaphragm, so some improvement has to be made. . That is, since the
deformation characteristic of the edge portion 2 supporting the rectangular flat diaphragm 1 is
equal length conversion in the portion supporting the linear portion of the rectangular flat
diaphragm 1, a rectangular flat surface is generated without causing undue deformation. The
diaphragm is supported so as to be displaceable by the piston and has linear characteristics, but
since the portion supporting each of the corners a, b, C, d of the rectangular planar diaphragm 1
is not equal length conversion, The piston displacement of the rectangular flat diaphragm is
suppressed to deviate from the linear characteristic. Thus, the rectangular flat diaphragm has a
disadvantage that distortion at the time of large amplitude is increased, and the low resonance
frequency f0 is increased as compared with the case where the third portion of the straight
portion is supported by the edge member. The Furthermore, in the case of an electrodynamic
speaker using a rectangular flat diaphragm, when the method of directly driving the rectangular
flat diaphragm by one voice coil bobbin is adopted, the high frequency reproduction limit is
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determined by the division resonance of the diaphragm. . Therefore, an attempt has been made to
expand the reproduction band by controlling the resonance in the low order by a node drive
method in which the node at the time of resonance of the diaphragm is directly driven by a voice
coil. In this case, there is a disadvantage that rolling is likely to occur due to one-side driving, and
as a means for solving this, as shown in FIG. 2, the rectangular flat diaphragm 1 is made of the
edge member 4 with the edge width asymmetrical. By supporting the frame 3, a method is
proposed to reduce the rolling phenomenon. However, in the case of the asymmetrical edge, each
corner portion e, f of the rectangular flat diaphragm 1 as shown in FIG.
Smooth connection by q and h is not only not good, but also it deviates from the linear
characteristic by suppressing the piston displacement of the rectangular flat diaphragm, and
thereby, There is a disadvantage that distortion increases. Further, as a means for solving the
above-mentioned drawbacks, as shown in FIG. 4, one has been proposed in which an edge shape
of a part of each corner of the rectangular flat diaphragm 1 is diagonally provided with a
rhombus 6. However, in the case of the above-mentioned edge, it is possible to reduce the nonequidistant conversion of each corner portion relatively to the piston displacement of the
rectangular flat diaphragm 1 by the effect of diagonally inserted grooves, and keep the linear
characteristic of the amplitude. Although it is possible, diagonally inserted grooves will reinforce
the softness of the edge (with nodes in the direction of the amplitude, making it difficult to
move). 2.) This has the disadvantage that the stiffness of the edge increases and, consequently,
the lowest resonance frequency f0 of the vibration system rises. The present invention solves
such a conventional drawback, and by providing a wedge-shaped lip at a part of each corner of a
dummy edge member resiliently supporting a rectangular flat diaphragm on a frame, the
vibration system can be obtained. It is designed to be able to perform elastic support well, and
even in the case of an asymmetric edge, it is possible to connect smoothly at each corner portion,
thereby reducing strain and rolling. In order to be able to An electrodynamic speaker according
to the present invention will be described below with reference to the drawings. FIG. 5 shows an
embodiment of the present invention. In FIG. 6, the rectangular flat diaphragm 1 is elastically
supported by the frame 3 by the edge member 2 whose edge width is symmetrical. In this case,
the rectangular flat diaphragm 1 is configured to be directly driven by one voice coil bobbin. The
edge member 2 is provided with a wedge-shaped lip 6 at each corner portion 'f 31 J'. The wedgeshaped lip 6 has a V-shaped groove in the diagonal direction at each corner portion tlllk, l, and
the V-shaped groove is common to the longitudinal direction and the latitudinal direction of the
rectangular flat diaphragm 1 described above. Have a length equal to When the rectangular flat
diaphragm 1 is elastically supported on the frame 3 by the edge member 2 provided with the
wedge-shaped lip 6 at each corner portion '1 11 k,' as described above, not only straight portions
of the rectangular flat diaphragm By providing a wedge-shaped rib also in each corner portion, it
is possible to absorb mechanical strain generated at the edge due to the amplitude in the lip
shape and to reduce the stress which causes non-equidistant conversion.
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In addition, since the shape of the lip is included without preventing the amplitude of the edge,
the stiffness of the edge member is lowered, the range of the linear characteristic between the
input and the displacement in the vibration system is expanded, and the mechanical resonance
sharpness is small. The increase of distortion at the time of large amplitude can be made
extremely small. FIG. 6 shows another embodiment of the present invention. In FIG. 6, the
rectangular flat diaphragm 1 is elastically supported by the frame 3 by the edge member 4
whose edge width is asymmetric. In this case, the rectangular planar diaphragm is configured to
be driven by a node driving method in which the node at the time of resonance of the diaphragm
itself is directly driven by the voice coil, and the resonance in the low order is controlled to
reproduce the band. To expand the And the said edge member 4 is the corner part m. Wedge
shaped ribs 7 are provided on n, o and p. The wedge-shaped rib 7 is a portion of each corner m,
n, o. As shown in FIG. 8 in the diagonal direction at p, the V-shaped groove 8 is provided, and the
V-shaped groove is used in common, and the lengths different in the longitudinal direction and
the lateral direction of the rectangular flat diaphragm 1 are different. have. When the rectangular
planar diaphragm 1 is supported on the frame 3 by the edge member 4 provided with the wedgeshaped rib 7 at each corner portion m, n, o, p as described above, the wedge shape is obtained as
in the above embodiment. The provision of the rib 7 makes it possible not only to connect
smoothly at each corner part of different edge width, but also to be able to support the vibration
system well. As described above, according to the present invention, since the rectangular flat
diaphragm is elastically supported by the edge member provided with the wedge-like rib in each
corner part, in the corner part of the rectangular flat diaphragm Also, it is possible to reduce the
stress due to the non-equidistant conversion and perform isometric conversion equivalent to that
of the straight line part, which has an advantage that strain reduction and rolling phenomenon
reduction can be simultaneously achieved.
[0002]
Brief description of the drawings
[0003]
1 is a top view of a conventional speaker (symmetrical edge), FIG. 2 is a top view of a
conventional speaker (asymmetric edge), and FIG. 3 is an enlarged view of an edge member of
the speaker shown in FIG. FIG. 5 is an enlarged view of the edge shape of the conventional
speaker, FIG. 5 is a top view showing an embodiment of the loudspeaker (symmetrical edge) of
the present invention, and FIG. 6 is another embodiment of the loudspeaker (asymmetrical edge)
of the present invention. The top view which shows, FIG. 7 is an enlarged view of the edge
member of the same speaker, FIG. 8 is the expanded sectional view of the edge member of the
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same speaker.
1 ...... rectangular flat diaphragm, Rei 4 ...... edge member, 3 ...... frames, 6,7-river ... wedge-shaped
ribs. Name of Agent Attorney Nakao Toshio Other 1 person II Figure 2 Figure 3 Figure 14!
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