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JPS5587793

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DESCRIPTION JPS5587793
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view showing a general
speaker, FIG. 2 and FIG. 3 are sectional views showing an essential part of a conventional
speaker, and FIG. FIG. 5 is a top view of an edge of an embodiment of the speaker according to
the present invention, FIG. 6 is a sectional view of the same part, and FIG. 7 is a sectional view of
another main part shown in FIG. FIG. 8 is a top view showing an example of a damper used for
the speaker, and FIG. 9 is a cross-sectional view of the relevant part. 5 · · · Magnetic circuit, 6 · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · voice coil, 11 · · · Damper, 12 Magnetic gap, 16
Corrugation, 17 ... Shallow portion of the corrugation depth. −
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker in
which the change of the lowest resonance frequency is reduced by improving the vibration
system supporting member of the edge or the damper. In general, the speaker is configured as
shown in FIG. That is, the ring magnet 3 on the plate type 2 having the center pole 1, the same
ring shape, \), -1 r) 7 A f-7/7 r) q)! 7L / -muro is coupled to a magnetic circuit 5 configured by
incorporating an upper portion 4 below 2 and an edge 9 of a diaphragm 8 is coupled to a
peripheral portion of the frame 6 together with a gasket 7 by bonding or the like. A central
portion of the plate 8 is connected to a wheel x :: + 1o, and the middle portion of the voice coil 1
° is supported by a damper 11 so that the lower portion of the voice coil 1o is not eccentric to
the magnetic gap 12 of the magnetic circuit 6. In addition, a dust cap 13 is attached to the
central upper surface of the diaphragm 8 so as to fit in. In the speaker having such a
configuration, the lowest resonance frequency F □ is expressed by the following equation. “SM
is the stiffness of the vibration system support member of the edge 9 and the damper 11, and
MMl + MM2 + 21′l [h4A is the mass of the diaphragm 8. As is apparent from the above
equation, the lowest resonance frequency Fo of the speaker changes as the stiffness of the
vibration system supporting member b of the edge 9 and the damper 11 changes. 3) By changing
the lowest resonance frequency Fo, the amplitude amount at a low frequency is changed, and the
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sound quality is changed by the change. The conventional speaker edge 9 has a uniform
waveform over the entire circumference as shown in FIG. 2 or a roll shape as shown in FIG. 3
foot, and the material is a cloth impregnated with resin or , Urethane, maltobrene, rubber, paper
and paper impregnated with resin. Further, as the dampers 11 of the conventional speaker, as
shown in FIG. 4, a plurality of corrugations were formed over the entire surface, and the material
used was a cloth impregnated with a resin. The lowest resonance frequency F when repeatedly
oscillating with the maximum amplitude amount using such an edge 9 or a damper 11. Was a
major change. In particular, when the corrugated edge e and the damper 11 are used, and a
paper, paper or cloth impregnated with a resin is used, the change of the lowest resonance
frequency Fo is the largest. Therefore, although the edge 9 and the damper 11 are designed so
that the amplitude can be taken larger than the amplitude at the maximum input which can be
calculated in calculation, in order to raise the problem of the frequency characteristic and the
lowest resonance frequency Fo In some cases, the amount of shaking could not be increased.
That is, as the area of the edge 9 is larger, the edge resonance is more likely to occur, and as the
width of the edge 9 and the damper 11 is larger, the stiffness becomes smaller and the lowest
resonance frequency F. Was supposed to go down. The present invention addresses the abovementioned conventional drawbacks. Hereinafter, an embodiment of the present invention will be
described with reference to FIGS. 6 to 9. First, an edge 9 will be described with reference to FIGS.
5 to 7. In the embodiment shown in FIGS. 5 and 6, a corrugated corrugation 16 is provided
between the sticking portion 14 with the diaphragm 8 and the sticking portion 15 to the frame 6,
and the corrugation is formed at several points of the corrugation 16 There is a portion 1 16
where the depth of 16 is made shallower than the other portions. Further, 7-3 in FIG. 7 are
several locations 7) of the roll-shaped corrugation 16; and a section 17 in which the corrugation
is made shallow is provided in the garden 5 '. 8 and 9 relate to the damper 11 and are configured
by providing the portion 17 with a shallow depth of corrugation at several places of the
corrugations 16 of the waveform. Thus, by providing the shallow portions 17 of the corrugation
depth at several points of the corrugation 16, the whole is not appreciated at the maximum, and
the change of the stiffness of the edge 9 and the damper 11 is reduced. The change of the lowest
resonance frequency Fo can be reduced. As described above, since the speaker of the present
invention is configured, the stiffness of the vibration system support member can be made
constant, and hence the lowest resonance frequency as the speaker does not become unstable,
and at low frequencies. It has the advantages of stable amplitude and stable sound quality, and is
of great practical value.
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