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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an embodiment of
the present invention, and FIG. 2 is a sectional view showing another embodiment. DESCRIPTION
OF SYMBOLS 1 иии AE opening ииииииииииииииииииииииииииии Diaphragm, 8?1: dome, 8?2: edge, 9: packing, 10:
braking material , 11: voice coil, 12 ...... horn. 4- ? 1 ? -53 ? ? 4688724 (2) ? 2 ? 54-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a loudspeaker having a dome-shaped diaphragm, commonly referred to as a horn-type
loudspeaker. In general, in this type of speaker, a phase shift tends to occur between lW + of the
radiation sound from the vibrating object dome portion and the radiation sound from the edge
portion of the outer periphery supporting the diaphragm. Those that have caused problems such
as causing extreme peak dick in the frequency characteristic on the suit-4B-88724-02 peaker
axis due to phase relationship etc. or causing distortion in the low band in the band etc. It is. In
the past, the width of the edge portion has been taken into consideration as a means for
regenerating such an adverse pick-up, or a bis-colloidal damping material is applied to the edge
portion to prevent this. It is easy to generate various conditions that do not favor the
characteristics of the tatami mat due to the design or the unreasonable use of the former means,
and the characteristics may vary even if the latter means is adopted. It is inconvenient to cause
changes, and it is difficult to obtain an effective braking action by adopting any means. The
object of the present invention is to eliminate such inconveniences. The present invention will be
described below based on FIG. In Fig. 1, one implementation second of the present invention is
shown by a broken line, and (D ((B is a yoke, a cylindrical magnet, a plate and a pole piece,
respectively. The magnetic circuit is bic. There is a throat 48-88724-3-2 mounted on the plate (a
plate is a plate plate), and an equalizer (a mouth is provided at the center of the opening (6) of
the throat. (8) is a diaphragm which shoulders the dome & <8-7 and an edge portion (8-2)
formed on the outer peripheral edge of this dome portion, and this diaphragm (this is the edge
portion (B-2 8 "plate (in town and throat) (in the town and ji) inserted in the M outer cylinder
part of the 7" I. Patzkin (9 attached). (10) is a damping material attached to the edge portion so
as to substantially occupy the entire empty rd1 portion formed on the th of the edge portion and
the throat portion surrounding the edge portion 1, this damping If the material is fl, it is formed
of polyurea / dan resin 1, r и the diaphragm (8) is the same shape (и == IJv formed, and it is held
by a composite type or a mold) as the BL component A liquid polyurethane is injected into the
wood mold or mold and the edge part and the CIMI, and after the original polyurethane foam is
completed, the He wood mold or mold is removed and the paper sheet is removed by etching.
Note that a predetermined shape 0 ░ ? ? L: '+ ? pH ? ? iB и ? 1 is provided at a
predetermined position in the case where a fireproofing material is applied to the fireproofing
material. By using the adhesion of polyurethane by setting the diaphragm edge 5- ,? It is possible
to tightly bond polyurethane molded in a predetermined shape only to 4B-88724-0441 part. In
the drawing, (77) j ? ? ? ?) leg ? ? ? ? ? ? ? ? ? ? ? ?) K * (= tlbin ? ? ? ? ? 1
и () 2) indicates a horn fitted to the opening of the throat . Since the present invention is described
as described above, the damping member provided with the vibration ? j ? ? ? ? ? ? ? ?
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?? ? ? is the gap between the ????
and the speaker body surrounding the edge of the ?1?. It is possible to store so as to occupy
the entire space without difficulty, so that it is possible to give a very good braking effect to the
edge portion, and the conventional .sigma .. It can be resolved to the width. Moreover, according
to this invention, the damping material does not occupy the entire space as shown in -F, and the
air rt! It is also possible to provide a damping material of a shape different from that of the +
internal part. The damping material may be applied only to the upper surface of the edge portion
as shown in FIG. 1, but may be provided only on the lower surface or on both the upper and
lower surfaces as needed. Fig. 2 shows the effect of providing a damping material to the upper
and lower picture quotients of the edge portion so as to increase the braking effect from -4 to -4).
Each has shown the considerable part.
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