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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a conventional domeshaped speaker, FIG. 2 is a sectional view showing an embodiment of the dome-shaped speaker
according to the present invention, and FIG. 3 is a dome according to the present invention FIG. 7
is a cross-sectional view showing another embodiment of the speaker. In the figure, 1 is a
diaphragm, 2 is a drive wire ring, 3 is a yoke, 4 is a frame, 5 is a damper, 6 is a central pole, and
7 is an external diaphragm. In the drawings, the same reference numerals indicate the same or
corresponding parts. (I) 71-real opening 48-60 532 (2)-72-
DETAILED DESCRIPTION OF THE INVENTION In the present invention, the improved KWA of the
dome-shaped speaker 0 year 1 shows an example of a conventional dome-shaped speaker, and in
the figure, (1) indicates aluminum, duralin, titanium, cloth 1 A diaphragm formed in a dome
shape by a thin plate of paper, Bakelite, Mylar or the like, (2) is a drive-wheel fixed inside the
spherical surface of the diaphragm (1), (3) is a ring, <4 The frame attached to the yoke (3), (5)
has the inner peripheral surface fixed to the outer periphery of the drive wire ring (2), the outer
peripheral surface fixed to the frame (4), and the diaphragm (1) And an annular damper for
supporting the drive wire ring (2), (6) being a central pole. Therefore, in the above structure, the
diaphragm (1) is formed in a dome shape, which has an advantage of wide directivity, but on the
other hand, it is difficult to increase the diameter of the diaphragm (1) in structure, and acoustic
radiation There was a drawback of low efficiency. Therefore, the diaphragm (1) may be enlarged
to increase the acoustic radiation efficiency, but since the diameters of the diaphragm (1) and the
drive wire ring (2) are almost equal, the drive wire ring ( Since the diameter of 2) must be
increased, and the value of the impedance of the speaker is specified, the l1ft resistance value
will also be decreased, so the winding width becomes smaller if the diameter of the drive wire (2)
is increased As a result, the strength of the drive wire ring (2) is reduced, which tends to cause
contact or abnormal resonance. Furthermore, there is a drawback that the size of the center pole,
the yoke or the magnet becomes large and the cost increases. Mouth) ρ-F'in! In addition, since
the conventional dome-shaped speaker has only the damper in the conventional dome-shaped
speaker, the vibration system is compared with a cone speaker having two supporting portions of
the outer peripheral portion and the damper as compared to the cone speaker. There was a
drawback that was prone to sideways. The present invention eliminates the above-mentioned
drawbacks, and in the following, the embodiment according to the present invention will be Bm
according to the drawings. FIG. 2 shows an embodiment fll of a dome-shaped speaker according
to the present invention, in which (7) has a ring-shaped inner peripheral surface fixed to the
outside of the spherical surface of the diaphragm (1) and a ring-shaped outer peripheral surface
Is an external diaphragm attached to the frame (4), and the ring-shaped half section of the
external diaphragm (7) is semicircular with a convex portion formed on the upper side, b is the
main part of an arc (7 m) And an outer edge portion (7b) of a small circular arc which is
connected to the outer edge of the main portion (7a) and has a convex portion formed
downward. The material of this external diaphragm (7) may be the same as or different from the
material of the diaphragm (1), but it is integral when the diaphragm (1) is moved by the drive
wire ring (2) It is necessary to have a sufficient hardness W 'to be driven in the (b) direction, and
in particular, the material of the outer edge portion (7b) is a main portion (body) 4B-60532-04
□-to-7a) K It is desirable to perform the same operation as the softer edge, for example, =-in
Therefore, in the dome-shaped speaker of the above structure, when the dome-shaped diaphragm
(1) is operated, the external diaphragm (7) is also moved in the same direction and integrally
operated, thereby increasing the radiation area And the acoustic radiation efficiency can be
increased. In addition, as the support of the vibration system, the damper (5) and the external
diaphragm (also supported by η, the support portion is doubled, so the vibration of the vibration
system has less lateral deflection, and the motorized wire ring The contact to the working air gap
of (2) can prevent abnormal resonance. Fig. 8 shows another example of the rod of the domeshaped speaker according to the present invention. In Fig. K, the external diaphragm (7) has a
triangular main part (7 heat) and a small arc outer edge (7b And those formed by Of course, the
operation is the same as the intention. As described above in detail, according to the domeshaped speaker according to the present invention, the acoustic radiation efficiency is high (2)
Ao-QnKQ-nr-6 body, nr, nr, and vibration system The support is doubled 9, the lateral vibration
of the vibration system is small, and the contact of 1 □ to the gap of the drive wire or abnormal
resonance can be prevented. −
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