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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a loudspeaker, and
FIG. 2 is a frequency characteristic of a loudspeaker using an edge material according to the
present invention and a loudspeaker using a conventional edge material. Description of the
symbols of the main parts, 7: dampers, 8: cones, 9: center ones 7), 10: ends, 11: frames, 12:
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker.
FIG. 1 shows an example of a cone speaker. 1 is a back plate, this back plate 1-image-/ ly! The
pole piece 2 is placed at the central part of the tps 5 and the magnet 3 is placed at the peripheral
part. The plate 4 is placed on the magnet 3 and forms a magnetic gearing with the pole piece 2. A
voice coil bobbin 6 carrying a voice coil 5 is vibratably inserted into the magnetic gap and
supported by a damper 7. A cone 8 is coupled to the voice coil bobbin 6 at its central hole, and a
center cap 9 is further crowned. The opening peripheral edge portion of the cone 8 is supported
by the frame 11 through the edge 0. The edge 10 is further secured to the frame 11 by a gasket
12. The lead wire of the voice coil is connected to a terminal 14 provided on the side surface of
the frame 11 through the tinsel wire 13. The edges of such a speaker include a fixed edge made
of the same material as corn paper and made integrally with corn paper, and a free edge made of
a material different from corn paper. Conventionally, cloth, urethane, rubber or the like is used as
the material of the free edge, and it is generally considered preferable to have a suitable degree
of flexibility and little change with time. However, in the edge using cloth and urethane, there is a
disadvantage that the compliance in the low-pitch range is poor in the case of a large-diameter,
heavy-weight r-n paper because of the small specific gravity. In the case of the rubber edge,
though, the above-mentioned compliance o can be substantially improved, but it has the
disadvantage that the weather resistance, the durability and the formability are poor. An object of
the present invention is to provide a speaker having a ridge that solves the above-mentioned
drawbacks, and such an edge is obtained by copolymerizing polystyrene and polyolefin. It
consists of an elastomer of The elastomer has little change in hardness due to temperature
change, and is excellent in weatherability and durability. The hardness is adjusted by changing
the blending ratio of polystyrene and polyolefin when the elastomer is a copolymer of
polystyrene and polyolefin. It is possible. The specific gravity can also be adjusted by mixing the
elastomer with a hollow hollow body such as a shirasu balloon or microscare. Therefore, by
adjusting the hardness and specific gravity of the elastomer in accordance with the body shape
such as the weight or size of the cone when manufacturing the edge, an edge having the
optimum weight and appropriate flexibility can be obtained.
The elastomer is preferably an ABA type copolymer of polystyrene and polybutadiene or
polyisoprene, and the copolymer can be obtained, for example, by a living polymerization
method. Here, A is poly, styrene and B is polybutadiene or polyisoprene. Although this type of
elastomer exhibits behavior as a thermoplastic resin at 140 ° C. or higher, it exhibits rubber
elasticity similar to that of a flowable rubber at ordinary temperature. Furthermore, such
elastomers can be processed by injection molding, extrusion molding, blow molding,
thermoforming and the like using a conventional processing machine for thermoplastics. Fig. 2
shows the frequency characteristics of the speaker (A) using the edge material according to the
present invention and the speaker (B) using the conventional edge material, and (A) shows a
standard environment with a temperature of I ° C and a humidity of 70%. The characteristics
under the measurement conditions, (B) are the characteristics after a temperature of 110 ° C.,
humidity + 50%, heat resistance for 96 hours, 1 li I wet test. (C) shows the characteristics after a
cold resistance test for 96 hours at a temperature of -30 ° C. As is apparent from the figures (A)
t (B) and (C), the loudspeaker (using the edge material according to the present invention) has
better rising characteristics in the low frequency range as compared with the conventional one.
In addition, after the cold resistance and heat resistance test, the elastic modulus of the
conventional one increases as the temperature decreases, or the rubber hardness is hard. For this
reason, the resonance phenomenon is likely to occur in the low band and the high band, and the
sound pressure is reduced. Also, as the temperature rises, the edge material softens and the
rising characteristic of the low band becomes worse, and the resonance phenomenon tends to
occur in the high band. Since the edge material according to the present invention has good
weather resistance characteristics as compared with such a conventional enone material, the
decrease in sound pressure due to temperature change is small, and the resonance phenomenon
in the low region and high region is also small.
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