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JPS5741389

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5741389
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an example of a
conventional speaker, FIG. 2 is a cross-sectional view showing an embodiment of the speaker
according to the present invention, and FIG. is there. 5 ииииии Ring-shaped diaphragm, 9
ииииииииииииииииииииииииииииииииииииииииииииииии Styrofoam foam. ?
DETAILED DESCRIPTION OF THE INVENTION The invention relates to a loudspeaker. Generally,
there is a speaker as shown in FIG. 1 as a speaker using a ring diaphragm. That is, fl) t; 4
cylindrical coil bobbins, a voice coil (2) is wound around the outer periphery of this coil bobbin
(1), and a cylindrical magnet (3) is loosely inserted from the lower opening The upper and lower
ends are fixed to the yoke (4). (5) is a ring-shaped diaphragm, and this ring-shaped diaphragm (5)
t; The lower end of the groove (9) is attached to the upper peripheral edge of the coil bobbin (1),
and the inner and outer peripheral edges thereof are fixed to the spacer (7) K via an edge (6). The
spacer (7) is held by the yoke (4) and the cover (8). However, in such a conventional speaker
structure, the vibration of the feeding coil bobbin (1) faithful to the ring shape of the feeding coil
bobbin (1) in which the strength of the attachment portion between the coil bobbin (1) and the
ring diaphragm (5) is insufficient. The diaphragm (51 has a problem that transmission can not be
performed. The present invention has been made in view of such conventional problems, and
aims to solve the above-mentioned problems by filling the groove portion of the ring-shaped
diaphragm with foam. , J! ??????????????????? FIG. 2 is a view showing one
embodiment of the present invention. One ?? is a foam such as expanded polystyrene, and this
expanded polystyrene ?? is filled in the groove (9) of the ring-shaped diaphragm (5). . As
described above, according to this invention, since the foam is filled in the groove portion of the
ring-shaped diaphragm, the strength of the attachment portion with the coil bobbin can be
increased, and the vibration of the coil bobbin (2) Can be transmitted to the ring diaphragm
faithfully. Since the strength of the ring diaphragm is also increased, the piston vibration area can
be expanded, and the reproduction band of the speaker can be expanded. Furthermore, it is
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possible to eliminate the interference of unnecessary sound waves generated in the groove
portion. The effect of this filling is shown in FIG. In FIG. 3, (f) is the frequency, (p) is the sound
pressure, the arrow (4) is the conventional blue tatami characteristics, and the arrow CB) shows
the acoustic characteristics of the speaker of this invention. In particular, it can be understood
that the improvement in one treble range (around 20 KHz) is remarkable.
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