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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1a is a longitudinal sectional view of an
embodiment of the present invention, FIG. 1b is a plan view of a diaphragm, FIG. 2 is a sound
pressure characteristic diagram, and 7 is a dome diaphragm. The main portion 9 is a suitable
hole, and 10 is a viscoelastic synthetic resin layer of a non-air-permeable soft elastic material.
Color (f)-87-Japanese Utility Model Application No. 51-938
DETAILED DESCRIPTION OF THE INVENTION This invention relates to the improvement of a
dome speaker, in particular its diaphragm. Form holes arranged in a spherical portion Km-like
shape of the dome speaker diaphragm and attach non-air-permeable soft elastic material from
the back surface (front or both sides) of the spherical portion A synthetic f1 楢 layer is provided
to cause mechanical loss in the spherical part by soft elastic action of each hole part and lower
the resonance frequency of the diaphragm itself to reduce Q of resonance to cause occurrence in
the spherical part (1) To prevent split resonance due to bending motion, remove sharp resonance
sieves generated in high frequency range, and also prevent abnormal noise generated by a rigid
diaphragm such as metal or Bakelite paper. It is. A conventional dome speaker diaphragm is fixed
to four parts of a drive wire ring and converts imaging motion into sound waves, but in order to
improve the radiation efficiency of the speaker, the mass of the mobile plate is reduced in weight
and formed thin . For this reason, the diaphragm is weak in strength and the diaphragm shows
one body at low frequency, and each part of the vibration vibrates as one unit, but as the
frequency becomes bright, the moving plate integrally vibrates? The bending movement is
caused, and vibration & division resonance occurs in each part by the phenomenon, and a sharp
peak is generated in the high frequency band due to the characteristic, and the material of the
diaphragm is abnormal sound due to metal or hard material such as Bakelite paper The sound
quality characteristics were adversely affected. In the prior art, in order to remove this irregular
sound, the pressing pressure at the time of molding of the diaphragm was weakened, or a sound
absorbing material was inserted inside the spherical portion, or a tamping paint (2) was applied.
However, this method has a drawback that it is difficult to remove resonance noise. This
invention eliminates these conventional drawbacks. An embodiment of the present invention
shown in the drawings will be described below. 1 (a) and 1 (b), p (1) is a speaker yoke, (2) is a
center hole integrated with the yoke, (3) is a permanent magnet, (4) is a speaker plate, +51 is a
frame fixed to this plate, (6) is a speaker drive wire, (7)! dThe end of this drive wire ring V The
main part of the device fixed to this invention, ta) Ii This diaphragm drive wire ring is supported
[7 spars to prevent the side swing, (9) vibrates by 1 尼An array of butterfly-like ones formed in a
spherical part of a plate: 1 ′ ′ formed in a bowl, Q (1 is a non-air-permeable soft elastic
material embedded in the spherical part, a laminated layer VV ′ ′ f1 also embedded in earth Is
a viscoelastic synthetic tree Sa layer. As described above, the dome speaker diaphragm of this
invention is provided with non-air-permeable viscous (3) elastic synthetic resin layers in each
hole provided in the spherical portion, and the soft elastic action of each hole causes the
diaphragm itself to The distortion factor can be greatly reduced without suppressing excessive
vibration and generating sharp resonance taste caused by split resonance of the diaphragm as
shown by the broken line in FIG. 2, and the material of the diaphragm is metal or bakelite Even
with a hard material such as paper, since a good improvement result can be obtained without
generating abnormal noise, the practical effect is large.
In the above description, the case of using a synthetic resin as the soft elastic material has been
described, but it is needless to say that the present invention is not limited to the 9 synthetic
resin, and a soft elastic material such as rubber may be used.
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