JPH05176392

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DESCRIPTION JPH05176392
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used in many other fields such as for Hi-Fi and vehicles.
[0002]
2. Description of the Related Art Conventionally, an edge is fixed inside the surface outer
peripheral portion of a diaphragm and the edge is covered with the diaphragm, and a ring fixed
to a frame is used to maintain a fixed gap with the surface outer peripheral portion of the
diaphragm. There is something to configure.
[0003]
Such a conventional speaker will be described below.
FIG. 3 shows a cross-sectional view of a loudspeaker in the prior art. In FIG. 3, 21 is a bottom
plate, 22 is a magnet, 23 is a top plate, 24 is a frame, 25 is a diaphragm, 26 is a corrugated edge,
27 is a voice coil, 28 is a suspension, 29 is a dust cap, 30 is a diaphragm 25 The gap formed by
the outer periphery of the surface of the frame 24 and the inner periphery of the frame 24. In
this example, the outer peripheral portion of the frame 24 is formed vertically to replace the
clearance ring.
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[0004]
FIG. 4 shows a cross-sectional view of a speaker edge portion in another conventional example.
In FIG. 4, reference numeral 34 denotes a frame, 35 denotes a flat diaphragm, 36 denotes an
edge, 40 denotes a gap ring, and 41 denotes a gap formed by the flat diaphragm 35 and the gap
ring 40.
[0005]
In the speaker as described above, the edge 36 is covered with the flat plate diaphragm 35 to
reduce the radiation noise from the edge 36 to reduce the edge resonance, and at the same time,
the gap ring 40 which maintains the predetermined gap 41 with the outer surface. The effect of
expanding the effective radius of vibration can be expected by the baffle effect of.
[0006]
However, in the above-described conventional configuration, since the edge supports the middle
of the diaphragm, the vibration surface is easy to move with this as a node.
Therefore, there is a difficulty that the vibration of the edge resonance leads to the divided
resonance of the surface even if the radiation from the edge is reduced, and the edge shape is a
simple roll with no resonance and the down roll from the point of contact with the diaphragm.
Often used.
[0007]
However, when the conventional down roll edge is used, the outer periphery of the diaphragm
approaches the edge so as to close the space inside the down roll edge, so an acoustic
capacitance is formed, and resonance occurs at a specific frequency. Sound pressure frequency
characteristics are disturbed. If the outer peripheral portion of the diaphragm is thick and the
gap is narrow, inertance also occurs, resulting in a more complicated acoustic circuit. These
acoustic circuits are structural factors that disturb the sound pressure frequency characteristics
except when actively used, and have been a conventional problem.
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[0008]
The present invention solves the above-mentioned conventional problems, and provides a
speaker with flat sound pressure frequency characteristics without generating an acoustic
resonance circuit while taking advantage of a speaker having a structure in which an edge is
covered with a diaphragm. The purpose is
[0009]
[Means for Solving the Problems] In order to achieve this object, the speaker according to the
present invention comprises an edge fixed inside the outer surface of the diaphragm and covered
with the diaphragm, and a ring fixed to the frame. While maintaining a fixed gap with the outer
surface of the diaphragm, use the down roll edge at the above-mentioned edge, and the contact
point of the down roll edge and the fixed part of the diaphragm is at least 1 down roll radius
forward of the frame's edge fixing surface. It has a configuration that jumps out by two or more.
[0010]
With this configuration, it is possible to maintain the necessary distance between the surface
outer peripheral portion of the diaphragm and the edge, and to prevent the generation of the
acoustic resonance circuit without generating the acoustic capacitance inside the down roll edge.
is there.
[0011]
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 shows a cross-sectional view of a loudspeaker according to a first embodiment of the
present invention.
In FIG. 1, 1 is a bottom plate, 2 is a magnet, 3 is a top plate, 4 is a frame, 5 is a diaphragm, 6 is a
down roll edge, 7 is a voice coil, 8 is a suspension, 9 is a dust cap, and 10 is a gap. A ring 11, 11
is a fixed gap formed by the outer periphery of the diaphragm 5 and the clearance ring 10, R is a
radius of the down roll edge 6, H is an edge fixing surface of the frame 4 from the down roll edge
6 and the diaphragm 5 It is the distance to the fixed part contact point.
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[0012]
The speaker configured as described above will be described with reference to FIG.
Here, the relationship of H ≧ 1/2 · R is satisfied. For this reason, a certain distance or more is
maintained between the surface outer peripheral portion of the diaphragm 5 and the down roll
edge 6, and since the space inside the down roll edge 6 is not blocked, the generation of acoustic
capacitance is prevented. When the distance between the fixing point contact of the down roll
edge 6 and the edge fixing face of the frame 4 is as 1⁄2 · RH as H >> 1/2 · R, the center of the
down roll edge 6 moves too much. Since the amplitude of the down roll edge 6 is limited or the
vertical portion of the down roll edge 6 is too long and there is a problem in strength and
formability, it is considered that H <2R or so is the limit. The small uproll portion provided on the
outer periphery of the downroll edge 6 is a consideration for preventing the contact between the
downroll portion and the frame 4.
[0013]
FIG. 2 shows the sound pressure frequency characteristics when H> 1/2 · R according to the
present embodiment and the sound pressure frequency characteristics when H00 according to
the present embodiment in the 16 cm speaker.
[0014]
As apparent from FIG. 2, the loudspeaker according to the present embodiment has an
improvement effect due to the flatness of the sound pressure frequency characteristic.
[0015]
As described above, according to the present embodiment, the edge is fixed inside the surface
outer peripheral portion of the diaphragm 5 and the edge is covered with the diaphragm 5, and
the surface outer peripheral portion of the diaphragm 5 with the ring 10 fixed to the frame 4 In
the speaker having a constant gap 11, the down roll edge 6 is used at the above-mentioned edge,
and the fixing point contact of the down roll edge 6 and the diaphragm 5 is at least down radius
of the down roll radius forward from the edge fixing face of the frame 4. By setting it as the
structure which jumps out by 1/2 or more, generation ¦ occurrence ¦ production of the acoustic
capacitance in the down roll edge 6 can be prevented, and the disorder of the sound pressure
frequency characteristic by an acoustic system resonance circuit can be improved.
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[0016]
As described above, according to the present invention, the edge is fixed inside the surface outer
peripheral portion of the diaphragm and the edge is covered with the diaphragm, and the ring
fixed to the frame is fixed to the surface outer peripheral portion of the diaphragm. In the
speaker having a gap, the down roll edge is used for the edge, and the contact point of the down
roll edge and the fixed part of the diaphragm protrudes at least 1/2 or more of the down roll
radius forward from the edge fixing surface of the frame. With the structure, the following
excellent speakers can be realized.
(1) There is no occurrence of acoustic capacitance in the edge roll which is a structural problem
of the conventional example, and the disturbance of the sound pressure frequency characteristic
by the acoustic circuit is improved.
(2) The effect of improving the sound pressure frequency characteristic by reducing the radiation
sound from the edge and expanding the effective radius of vibration of the diaphragm is also
utilized as it is.
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