JPS54181932

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DESCRIPTION JPS54181932
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a conventional
horn speaker, and FIGS. 2a and 2b are a longitudinal sectional view and a partially cut plan view
showing a diaphragm supporting structure of the same loudspeaker as above. 3a and 3b are a
longitudinal sectional view and a partially cut plan view showing an essential part of one
embodiment of the horn speaker according to the present invention 4 and FIGS. 4a to 4c
respectively show an essential part of another embodiment FIG. -1 · · · · · · · · · · · · · · · · · · · · · · edge
part, 4. . 5 ······································································································· 5 In the drawings, the same
reference numerals indicate the same or corresponding parts.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a horn speaker,
and more particularly to a support structure of its diaphragm. In the conventional horn speaker,
the diaphragm is configured such that an edge portion for supporting the diaphragm is
supported and fixed from both sides by a ring-shaped support member having a predetermined
thickness. FIG. 1 is a longitudinal sectional view of such a conventional horn speaker, and FIGS. 2
(a) and 2 (b) are the Ho 1 7 suspension 1- 1 'shown in FIG. It is the longitudinal cross-sectional
view which takes out and shows a board support structure part, and is a partially cut top view. In
these FIGS. 1 and 2 (a) and (b), 1 is a diaphragm, 2 is an edge portion, 3 is a voice coil, 4 is a
holding member on the upper surface side, 5 is a holding member on the lower surface side, 6 is
a holding member. A magnetic circuit unit, 7 is an equalizer, and 8 is a horn. That is, the flange 2
is flanged at a constant radius R1 by the edge portion 2ti supporting the diaphragm 1 and the
pair of upper and lower ring-shaped holding members 4 and 5. Conventionally, it has been
known that the frequency of resonance generated by the edge portion 2 is inversely proportional
to the square of the clamp radius hole of the edge portion 2, but in the conventional horn
speaker shown in FIG. 1 and FIG. In this case, the holding members 4 and 5 are merely formed in
a simple ring shape with a certain thickness, and the flange radius R8 of the edge portion is
constant over the entire circumference, so that sharp resonance occurs at a specific frequency.
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Since this resonance frequency is generally within the reproduction frequency band of the horn
speaker, the sound pressure frequency characteristic of the horn speaker is disturbed in the high
frequency band, and the sound quality of the do-J '-2 is not high. It was one of the causes of
deterioration. In addition, the occurrence of the above-mentioned sharp resonance causes
problems such as distortion of harmonic components. In the past, in order to cope with this, a
material with a large loss component was used as the material of the above-mentioned edge
portion 9) and the clamp diameter for holding the edge portion 2 was changed. However, the
above-mentioned resonance becomes a major problem in horn speaker design, and in some
cases, the reproduction frequency band may have to be narrowed, for example, by lowering the
high frequency limit frequency of the horn speaker. The The present invention has been made in
view of the above situation, and the edge fixing surface side of at least one holding member of
the pair of holding members for holding and fixing the edge supporting the horn speaker
diaphragm from both sides. In addition, by forming the recess so that the inner diameter of the
surface that flanges the edge portion is partially different in the circumferential direction, the
diameter of the edge portion is fixed to be partially uneven. It is an object of the present
invention to provide a horn speaker No. 1 in which sharp resonance does not occur at frequency.
An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.
3 (a) and Φ) are a longitudinal sectional view and a partially cut plan view showing an essential
part of one embodiment of the horn speaker according to the present invention, in which 1 is a
diaphragm, 2 is an edge, 4 Reference numeral 5 denotes a holding member on the upper surface
side, 5 denotes a holding member on the lower surface side, and 11 denotes a recess formed in
the holding member 5. That is, in this invention, at least one of the pair of holding members 4
and 5, in this case, the inner diameter (clamp diameter of the surface to which the edge portion 2
is flanged on the end 2 fixing surface side of the lower holding member 5). The recess 9 is
formed to be partially different in the circumferential direction. Therefore, in the recess 9, the
edge portion 2 is not retained, and the clamp diameter of the edge portion 2 is partially
nonuniform in the central direction, so that the resonance frequency is dispersed, and the
specific frequency as in the conventional horn spill force No sharp resonance will occur. For this
reason, the sound pressure frequency characteristics of the sound wave radiated from the horn
speaker can be improved, and the harmonic distortion generated by the resonance of the edge
portion 2 can be reduced. In the above embodiment, the case where the recess 9 is formed only
on the holding member 5 on the lower surface side is described, but it may be formed only on
the holding member 4 on the upper surface side or together with the holding members 4.5 on
the upper and lower surfaces. Of course. In addition, the shape of the recess 11 is not limited to
that illustrated in FIG. 3, and may be formed into a shape as shown in FIG. 4 (a) or FIG. 4C, for
example. The inner diameter of the flange 2 may be partially different in the circumferential
direction of the holding member. As described above, according to the present invention, it is
possible to provide a horn speaker in which sharp resonance does not occur at the specific
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frequency at the edge portion 2.
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