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JPS5474521

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5474521
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view of a conventional speaker,
FIG. 2A-C is a half sectional view of a conventional free edge type diaphragm, and FIG. 3 is a
conventional speaker of the present invention. Sound pressure frequency characteristics, FIG. 4 is
a half sectional view showing one embodiment of the speaker of the present invention, and FIG.
5A-C is a top view of a free edge used for the same speaker. 17 иииии Field-X 22 и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и Free edge, 24 и и и и cone paper, 25 и и и и и и и и и и и и и и ----- voice
coil, 27 ...... dampers, 28 ...... magnetic gap, 30 ...... reinforcing piece.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker
provided with a free-edge type diaphragm, in which reinforcing pieces extending radially inside
the free edge are attached to the diaphragm to suppress split resonance. A conventional speaker
is configured as shown in FIG. The frame 6 is connected to the king by the plate 2 provided with
the center pole 1, the ring-shaped magnet 3 and the field portion 6j constituted by the ringshaped upper plate 4> 2-2 and the rim of the frame 6 The diaphragm 8 is added to the gasket 7
together with the gasket 7, the voice coil 9 is coupled to the center of the diaphragm 8, the
middle part of the voice coil 9 is held by the damper 10, and the magnetic gear tube 11 of the
field unit 6 is The voice coil 9 is properly fitted, and a dust cap 12 is attached to the upper
surface of the central portion of the diaphragm 8. In the speaker having such a configuration, as
the diaphragm 8, a free edge type is used. As the diaphragm 8 having this free edge, as shown in
FIG. 2A-C, a corrugated free edge 14 is attached to a cone 13 paper, and a down roll free edge 16
is attached to a cone 13 paper. There are those in which an up-roll type free edge 16 is attached
to corn paper 13 and the like. Most of the free edges 14 to 16 are in the form of a ring, and
bonding with the cone paper 13) 3X. In such a configuration, the cone paper 13 causes split
resonance in a certain frequency lower region, and as shown by the solid line in FIG. It was
impossible to obtain the characteristics. The present invention eliminates the above-mentioned
conventional drawbacks. Hereinafter, an embodiment of the present invention will be described
12-05-2019
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with reference to FIGS. 4 to 5. FIG. First, in FIG. 4, reference numeral 17 denotes a field portion,
which is constituted by a plate 19 provided with a center pole 18, a ring-shaped magnet 20, and
a ring-shaped upper plate 21 as well. Although the field section 17 shown here is called an
external magnet type, it may be an internal magnet type field section in which a columnar
magnet or a laminate of a columnar magnet and a pole piece is incorporated in a yoke. . ?? A
frame 22 is connected to such a field part 17, and a diaphragm 26 made of a cone paper 24 with
a gasket 31 and a free edge 23 attached to the periphery is attached to the periphery of the
frame 22. A voice coil 26 is coupled to a central portion of the voice coil 26, the middle portion
of the voice coil 26 is held by a damper 27, and the lower portion of the voice coil 26 is properly
fitted in the magnetic gap 28 of the field section 17.
A dust cap 29 is attached to the upper surface of the central portion of the diaphragm 26. In the
above configuration, the free edge 23 constituting the diaphragm 25 is a roll as shown in FIGS.
6A to 6C, and a plurality of radial reinforcing pieces 30 are provided on the inner side thereof.
3o is stuck on the corn paper 24. Of course, not only the reinforcing piece 30 is attached to the
corn paper 24 but also the inner peripheral edge of the free edge 23 is attached. In general, split
resonance in a speaker changes depending on the shape of the cone paper, the strength of the
free edge, the shape of the cone, the weight of the cone paper and the voice coil, and so on.
??????????? Therefore, as described above, the reinforcing piece 30 of the free edge
23 is attached to the corn paper 24 to make the bending strength of the corn paper 24 strong
and to absorb the division resonance of the surface of the cone paper 24 by the reinforcement
piece 3o. Occurrence can be suppressed. Note that providing the reinforcing pieces 30 radially is
to suppress the decrease in the efficiency of the speaker to a low level without increasing the
weight of the diaphragm 25 so much and at the same time not to create a resonance point. As
described above, since the speaker of the present invention is configured, occurrence of split
resonance can be prevented, and sound pressure frequency characteristics can be flattened as
shown by the broken line in FIG. It has the advantage of being able to achieve high quality by
eliminating the possibility that the connection between the free edge and the free edge will be
strong, and that the connection of both will be broken at the time of large amplitude and the
occurrence of an abnormal person, etc. It is of great value.
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