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JPH03247099

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DESCRIPTION JPH03247099
[0001]
FIELD OF THE INVENTION The present invention relates to a loudspeaker provided to an
acoustic system. 2. Description of the Related Art Generally, as shown in FIG. 7, a conventional
speaker supports a diaphragm 76 which radiates a signal current of sound as a sound wave by a
frame 79 for protecting each component inside the speaker. In order to support the voice coil
bobbin 75 connected to the inner periphery of the diaphragm 76 by the frame 79, a damper 78
as a support system member is provided. ing. The edge 80 as the support system member and
the damper 78 are each formed of a single material such as cloth and have individually uniform
hardness, and from the voice coil 74, the voice coil bobbin 75, and the diaphragm 76. It
functions as a stopper for controlling the stroke of vibration of the vibration system member.
[Problems to be Solved by the Invention] However, when the above conventional speaker is used
for high power and an excessive sound signal is input to the speaker, an excessive vibration load
is applied to the vibration system member, and the vibration system member Since the stroke of
the vibration of the vibration reaches a limit, harmonic distortion occurs, and as a result, the
sound quality emitted from the diaphragm 76 becomes tight like a tight sound, resulting in the
deterioration of the sound quality. In addition, if the compliance of the edge 80 and the damper
78 is lowered by increasing the hardness of the speaker edge 80 and the damper 78 in order to
avoid such a problem, the occurrence of harmonic distortion can be avoided. There is a problem
that the low resonance frequency becomes high and the bass disappears. [Means for Solving the
Problems] In order to solve the above-mentioned problems, the speaker according to the present
invention emits sound waves by the vibration of a vibration system member and a support
system member for supporting the vibration system member by a frame. In a speaker provided
with an edge and a damper as each of the support system members, vibration system members
are connected to the inner circumferences of the support system members, and a frame is
connected to the outer circumferences of the support system members. , Have taken the
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following measures. That is, the hardness of at least one of the edge as the support system
member and the damper gradually decreases from the outer periphery of the support system
member to the inner periphery of the support system member. [Operation] According to the
above configuration, the compliance of the support system member gradually increases from the
outer periphery of the support system member to the inner periphery of the support system
member according to the change in hardness of the support system member. There is.
For this reason, at the time of small input of the signal current of sound, the inner peripheral
portion of the support system member with high compliance corresponds and the low frequency
resonance frequency is lowered, so that rich bass can be reproduced. On the other hand, at the
time of large input of voice signal current, the peripheral portion of the support system member
with low compliance corresponds to control the stroke of vibration of the vibration system
member, so generation of harmonic distortion can be avoided. Become. [Embodiment 1] The
following description will explain an embodiment of the present invention, while referring to
FIGS. 1 and 2. FIG. The speaker according to the present invention has a magnetic circuit 12 on
the back as shown in FIG. The magnetic circuit 12 includes a disc-like top plate 1 having an
opening 1 a, a disc-like bottom plate 3 having a cylindrical center ball 3 a at a central position,
and the top plate 1 and the bottom plate 3. It comprises an annular magnet 2 which is provided
between and is arranged to surround the outer periphery of the center ball 3a at a
predetermined interval, and these respective members are integrally connected. On the front end
face of the top plate 1, the inner peripheral end side of a frame 9 for protecting each component
inside the speaker is attached. An edge supporting portion 9 a having an annular flat surface
shape is formed on an outer peripheral portion of the frame 9. An outer peripheral portion of an
annular edge 10 as a support system member is fixed to the edge support portion 9a. In the
above-mentioned edge 10, convex portions 10a protruding upward in a continuous shape are
laid over the entire circumference, and in a state where the coating amount is gradually reduced
from the outer peripheral portion to the inner peripheral portion of the edge 10, For example, a
coating agent 11 such as acrylic is applied. In addition, the inner peripheral portion of the work
piece 10 is connected to the outer peripheral portion of the cone-like vibration vi 6 as a vibration
system member, whereby the outer peripheral portion of the diaphragm 6 is supported by the
edge 10 of the frame 9 via the edge 10. It is supported by the part 9a. An inner peripheral
portion of the diaphragm 6 is connected to an outer peripheral portion of a front end portion of a
voice coil bobbin 5 as a vibration system member, and the voice coil bobbin 5 is supported by a
frame 9 via a damper 8 as a support member. . The damper 8 has an annular shape, and in the
radial direction of the damper 8, convex portions 8a ... projecting upward and concave portions
8b ... projecting downward are alternately arranged in a row. A center cap 7 is attached to the
cone-shaped central portion of the diaphragm 6 so as to cool the opening of the voice coil bobbin
5, and the rear portion of the voice coil bobbin 5 is between the center ball 3 a and the top plate
1. The voice coil 4 as a vibration system member is wound around the rear outer periphery of the
voice coil bobbin 5 located in the formed gap.
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In the above configuration, as shown in FIG. 2, the edge 10 extends from the outer peripheral
portion of the edge 10 where the coating amount of the coating agent 11 is increased to the
inner peripheral portion of the edge 10 where the coating amount of the coating agent 11 is
reduced. The hardness of 10 gradually decreases, and correspondingly, the compliance of the
edge 10 gradually increases from the outer peripheral portion of the edge 10 to the inner
peripheral portion of the edge 10. [Embodiment 2] The speaker according to this embodiment is
formed in the same manner as the speaker of the first embodiment except for the edge. In the
edge 20 according to the second embodiment, as shown in FIG. 3, the convex portion 20a
protruding upward, the concave portion 20b protruding downward, and the convex portion 20c
protruding upward in the radial direction of the edge 20 , And from the inner periphery to the
outer periphery of the edge 20 in order. Further, the lengths L1, L2 and L3 of the concavities and
convexities of the convex portion 20a, the concave portion 20b and the convex portion 20c have
a relationship of Ll> L2> L3. The number of convex portions and concave portions provided at
the edge 20 is not particularly limited, and the length of the concavities and convexities gradually
decreases from the inner circumferential portion to the outer circumferential portion of the
machining edge 20. I do not mind. In the above configuration, the edge 20 has a hardness of the
frame of the edge 20 in accordance with changes in the lengths Ll, L2, and L3 of the respective
convexes 20a, the concave 20b, and the convex 20c provided in a row. It gradually decreases
from the outer peripheral portion connected to 9 to the inner peripheral portion connected to the
diaphragm 6 of the edge 20. Correspondingly, the compliance of the edge 20 from the outer
peripheral portion of the edge 20 It becomes higher gradually toward the inner circumference of
the edge 20. In addition to the edge 10 of the first embodiment and the edge 20 of the second
embodiment, the edge of the speaker according to the present invention is an edge in which the
foaming ratio is changed from the outer peripheral portion to the inner peripheral portion of the
edge. Alternatively, even when the edge whose thickness is changed is used, the compliance of
the edge can be gradually raised from the outer periphery to the inner periphery of the edge.
[Third Embodiment] The loudspeaker according to this embodiment is formed to be equivalent to
the loudspeaker of the first embodiment except for the edge and the damper. An edge (not
shown) of the third embodiment is one in which the coating agent 11 is not applied to the edge
10 of the first embodiment. The damper 18 according to the third embodiment, as shown in FIG.
4, has the same shape as the damper 8 of the first embodiment, and for example, the
impregnating agent 21 such as phenol / enol is an outer peripheral portion of the damper 18
From the inside to the inner circumference, with the amount of application being reduced.
In the above configuration, the damper 18 is connected to the voice coil bobbin 5 of the damper
18 from the outer peripheral portion connected to the frame 9 of the damper 18 in accordance
with the change in the applied amount of the applied impregnating agent 21. The inner
peripheral portion gradually decreases, and correspondingly, the compliance of the damper 18
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gradually increases from the outer peripheral portion of the damper 18 to the inner peripheral
portion of the damper 18. [Embodiment 4] A loudspeaker according to this embodiment is
formed in the same manner as the loudspeaker of the third embodiment except for the damper.
In the damper 28 according to the fourth embodiment, as shown in FIG. 5, convex portions 28a...
Projecting upward in the radial direction of the damper 28 and concave portions 28b. It is set up.
In addition, the length of each of the convex and concave portions 28a ... and the concave
portions 28b ... is the outer circumference connected to the frame 9 of the damper 28 from the
inner peripheral part connected to the voice coil bobbin 5 of the damper 28 It is in a state of
decreasing gradually over time. In the above-described configuration, the damper 28 has a
hardness from the outer peripheral portion of the damper 28 to the inner periphery in
accordance with the change in the length of the unevenness of each of the projected convex
portions 28a ... and the recessed portions 28b ... The portion gradually decreases, and
correspondingly, the compliance of the damper 28 gradually increases from the outer peripheral
portion of the damper 28 to the inner peripheral portion of the damper 28. In the loudspeaker
according to the present invention, coating of the coating agent on the edge of the first
embodiment, modification of the shape of the edge of the second embodiment, coating of the
impregnating agent on the damper of the third embodiment, and the fourth embodiment The
shape of the damper may be changed by combining any means, and a speaker taken by
combining these means is much more than a single speaker adopting these means. It is possible
to obtain the effect of the speaker according to the present invention. As described above, in the
speaker according to the present invention, the hardness of at least one of the edge as the
support system member and the damper is measured from the outer periphery of the support
system member to the inner periphery of the support system member The configuration is
gradually decreasing. Thereby, as shown in FIG. 6, the stroke of the vibration with respect to the
load of the vibration of the vibration system member of the speaker according to the present
invention is voiced when compared with the speaker A in which the compliance of the
conventional support system member is increased. When the signal current is small, that is, at
point a of small load, the stroke value is the same as that of the speaker A, while the speaker A
reaches the stroke limit at the load at point b, while the stroke limit is 0 It is extended to the
point.
Also, when compared with the speaker B in which the compliance of the conventional support
system member is lowered, the value of the stroke equivalent to that of the speaker B is taken at
the time of large input of audio signal current, that is, at zero point of heavy load The value of the
stroke of the speaker B is small at point a, which is a small input of the signal current, and the
reproduced sound in the low range is reduced, whereas the value of the large stroke is taken,
enabling rich bass reproduction. Play an effect.
[0002]
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Brief description of the drawings
[0003]
FIG. 1 is a longitudinal sectional view showing a speaker according to a first embodiment of the
present invention.
FIG. 2 is an enlarged cross-sectional view showing an edge of the first embodiment of the present
invention. FIG. 3 is an enlarged cross-sectional view showing an edge of a second embodiment of
the present invention. FIG. 4 is an enlarged sectional view showing a damper according to a third
embodiment of the present invention. FIG. 5 is an enlarged sectional view showing a damper
according to a fourth embodiment of the present invention. FIG. 6 is a characteristic diagram
showing the value of the stroke with respect to the load of the vibration of the speaker of the
present invention, the conventional speaker A, and the conventional speaker B. FIG. 7 is a
longitudinal sectional view showing a conventional speaker. 6 is a diaphragm, 8 · 18 · 28 is a
damper, 9 is a frame, 10 · 20 is an edge, 11 is a coating agent, and 21 is an impregnating agent.
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