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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a conventional
dome-type loudspeaker diaphragm, and FIG. 2 is a cross-sectional view showing one embodiment
of the dome-type loudspeaker diaphragm according to the present invention. Soot A1b ······ Esshi
part. I τ N! 〈で(! (A) ★ Go 2 (t)) 1) East 1b 22 Figure 107
DETAILED DESCRIPTION OF THE INVENTION This invention relates to a diaphragm for a do 7type speaker. A dome-shaped speaker is made of a dome-shaped vibrating rod formed of a
lightweight and rigid birdy material, and this vibrating & full-piston motion is caused to emit
sound to il-contact. -The diaphragm of the c- and r-type loudspeakers has better transient
characteristics than the cone-shaped <<<, excellent transient characteristics and-good cutting
sound can be obtained-where the peristalsis of the dome flood speaker To explain in detail the
wedge structure, a dome-shaped substrate integrally formed with the edge (a material that is
high in elastic group and small in density, such as navelylium, pail, or beryllium alloy) makes
JITol [lightweight and rigid. Lower the low frequency resonance by the edge part and widen the
internal range of the low frequency range. FIG. 1 is a cross-sectional view showing a conventional
imaging type 1i tube for a dome-shaped speaker in FIG. This figure shows the case where the
entire surface is coated with a film of ta + rs group 11 / domes 11s / a and edge portions / b7
beryllium alloy etc., and only 1-light domes s / a are coated with a coat. しかし。 Since the
engine part 10 is also coated with the film λ at the age 1ial, the softness of the edge slo is lost.
Due to the increase in flatness of the edge g / b, the number of lowest resonance iima increases,
and the reproduction band becomes narrower. -In the latter case 1bl, the strength of the outer
part of the dome-like sl & is decreased, so that distortion in one direction of the outer 1tts tends
to cause split peristalsis, resulting in a defect that the high frequency eye field-wave number
decreases. Have. Therefore, this invention is made in view of the above-mentioned point (== in
view, this step: IIi increases the stiffness of the draft (0 ° −0−) without suppressing the divided
vibration, and the piston linear movement region is wide. In other words, it is intended to provide
all the dome-shaped speaker swing plates having a wide reproduction band. Hereinafter, the
present invention will be described in detail using practical examples. FIG. 2 is a cross-sectional
view showing an embodiment of a dome-shaped speaker MJI moving plate according to the
present invention. The same figure is different from the figure 1 fal1 nfb + In the part different
from the beryllium alloy, the coating of the substrate / the coating 會 domed @ i 龜 and domed s
/ a I! It is in the point where it is woven to the range to the edge of 1 ffto of edge 1 lkto over Sff '.
If coating is performed in such a range, the shape of the coating 1 in the outer ms of the domeshaped 11 / a becomes an L-shaped or V-shaped angle, and the strength of the outer 111s is
large compared to the case of FIG. Increase. また。
Since the ETO 911 / b does not have a full-t coaching, the stiffness of the edge portion / b is less
likely to increase. Therefore, in addition to increasing the motility of the diaphragm according to
this fourth proposal-the diaphragm for the domame speaker by t: f, the coach of the donow-like
part, the edge part <1) As coating is applied to a part, the strength of the outer part of the domelike part can be increased to prevent deformation of one circle in one direction, and the high
frequency limit frequency can be generated by suppressing the divided vibration. In addition,
since the stiffness of the edge portion does not increase, the lowest resonance frequency is also
low. That is, according to this invention, it is possible to obtain a wide range of oscillations for a
dome-shaped speaker with a wide piston oscillation range, excellent transient physical properties
over a wide harmonic wave frequency range, and a well-cut sound.