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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing an embodiment of the
present invention, FIG. 2 is a plan view, FIG. 3 is a front view showing an embodiment of slack,
and FIG. 4 is a plan view. is there. 1 ...... dome-shaped diaphragm, 2 ...... dome rising Shingo's 3 ......
corrugation. 鏑 / / 、, 占 21 忌 a 79-
DETAILED DESCRIPTION OF THE INVENTION This invention relates to the improvement of a
speaker D using all dome-shaped sway plates, and is intended to expand the high frequency limit
1 # 17 JJE number of the speaker. By the way, as a factor for determining the high frequency
limit frequency of the loudspeaker using dome-shaped diaphragm sound, it is well known that
the dome rising portion stiffener U (based on the diaphragm is also zero). That is, since the domeshaped diaphragm is usually small at the dome rising edge, it is generally a tendency to be
absorbed by the voice coil vibration or its rising edge. Have. As the vibration frequency becomes
higher, the vibration frequency becomes more pronounced, and the vibration does not vibrate in
the high frequency region. G Gτ) Higashi-Tei. Therefore, in order to cope with the problem such
as this, the thickness of the diaphragm is made to be the whole person and the dome rising
portion stiffness is totally raised, whereby the high frequency limit 1. If an attempt is made to
increase the wave number '71, but when doing so, the whole diaphragm is increased in size, and
it also suffers from the disadvantage of a low activity factor of 1; '. In the loudspeaker according
to the present invention, the dome-shaped diaphragm D is provided with a corrugation in order
to cope with the above-mentioned conventional θ problem and to expand the high frequency
band limit frequency V, thereby reinforcing the entire portion. By this, the dome standing-the
capital city-stabness is the same as that of the whole. The detailed description will be made with
reference to the drawings. In the figure, reference numeral 1 denotes a dome-shaped diaphragm,
which is disposed at a radial position with respect to the center of the dome. It is done. A voice
coil 4 is attached to the diaphragm 1 described above. In the actual example shown in FIGS. 1
and 2, since the diameter of the voice coil 40 is approximately equal to the diameter of the dome-
shaped diaphragm 17), the corrugation 3 is provided to the dome rising fM2 as described above,
As shown in FIGS. 3 and 4, if the diameter is smaller than the diameter of the cover, the
corrugation 3 and the dome 2 are slightly separated from each other as shown in FIGS.
Alternatively, the voice coil may be placed on the inner side of the bore. According to the abovedescribed configuration, the dome standing dome 2 of the dome-shaped diaphragm 1 or several
fields Korgeon Yon 3 has x: i, W'Agh, and the portion D is not stiff or the alpha mea, so the voice
The coil 4 will be correctly transmitted to the diaphragm up to the high frequency without being
absorbed by the rise 9 2 and thus the speaker using the sliding plate ■ high frequency limit The
frequency will be greatly expanded.
Further, according to the configuration of such a dome-shaped diaphragm 1, V-m (3) + 714.1: 16.
j-"perpendicular i 2 fi: realized by stiffness in the same ridge or corrugation 3 C. Therefore, it is
possible to vibrate the whole diaphragm efficiently with no loss of vibration energy * without
wasting power as a whole. The loudspeaker according to the invention has a dome-shaped
peristaltic plate θ dome rising portion [W several corrugations all over, this rising! 都 ス テ 高 域
・ ・) r) Since it is an attempt to increase the noise, it has the advantage of being able to expand
the high frequency limit frequency or greatly compared with the conventional one, yet have an
efficient vibration overall figure 9.
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