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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
speaker, FIG. 2 is a cross-sectional view of the inventive speaker edge, FIG. 3 is an exploded view
thereof, and FIGS. 4 and 5 are respective inventive speakers FIG. 23 is a frame, 22 is an edge, 24
is a diaphragm, 21 a is a square hole, and 21 is a plastic edge material. -91-55-55736 (2)-92-
DETAILED DESCRIPTION OF THE INVENTION This invention relates to the improvement of the
speaker edge. In a cone type speaker, as shown in FIG. 1, a cone type diaphragm 4 is attached to
the upper end of a voice coil 3 held by a damper 2 in an annular magnetic gap 1 and vibration
generated by voice current flowing in the voice coil 3 To the diaphragm 4 to generate a sound. 2)
Since it is stuck to the frame 6 through the edge part 5 which formed the corrugation in the
outer peripheral part of the cone-type diaphragm 4, the edge part 5 receives the vibration of the
diaphragm 4, and various influences are It will be given. Especially in large-aperture, large-input
waste beakers (bass dedicated speakers), materials with large compliance (for example, rubber
thin film, foam rubber, urethane foam, etc.) different from corn paper because it is necessary to
take a large amplitude especially in low range The so-called free edge which is formed separately
from the edge portion by the like and attached to the outer peripheral portion of the cone
diaphragm is often used. A speaker using such a free edge can increase the compliance of the
edge portion so that it can maintain good linearity even for vibrations with large amplitude, while
the compliance is large, so the vibration of the edge portion The effect of holding the center of
the plate is reduced to cause lateral vibration of the diaphragm. In addition, the above-mentioned
edge material has a large mass, and since it is necessary to take a large amplitude of the
diaphragm in the low region, the area of the edge becomes large, and the real effective mass seen
from the voice coil becomes large and the efficiency as a speaker decreases. At the same time,
due to the increase in the area of the edge portion, there is a defect such as generation of nodal
vibration due to the natural vibration of the edge portion to deteriorate the frequency
characteristic of the midrange. In this device, the inner part of the edge part is configured to be
large in compliance, and the question is configured to be small in compliance. The whole edge is
large when the low range is large amplitude, or only the inside of the edge is small when the
middle and high range small amplitude In this way, the fire source of the free edge of the prior
art is solved, and the drawings will be described in more detail. FIG. 2 is a sectional view of the
edge portion of this invention speaker. FIG. 3 is the same exploded view, and the frame 23 is
made of a material with relatively small compliance such as plastic, and the square holes 21a are
radially extended to obtain desired compliance. On the upper surface of the edge material 21
provided with the second material 22 (for example, urethane foam) having a relatively large
compliance (eg, urethane foam) and having the corrugation 22a in the inner part and the cone
diaphragm 24 attached part 422b in the innermost peripheral part Stick it.
Thus, the corn paper is supported by edges of different compliance in the inner and outer
peripheries. That is, while the inner portion of the edge is only the edge member 22a and
compliance is large, the outer peripheral portion is a composite edge of the edge member 22 and
the edge member 21 so that the compliance is smaller than the inner peripheral portion. It
becomes. For large-amplitude vibration in the low region near foN, the edge part vibrates as a
whole as shown in Fig. 4. For small-amplitude vibration in the middle to high range, the
characteristics of Fig. 5 are compared. Only the inner circumference of the edge vibrates and the
outer part acts as a fixed end. In this case, since the driving load of the edge portion viewed from
the voice coil is only the inner peripheral portion of the edge and the effective mass is extremely
small, the efficiency in the middle to high range is remarkably improved. In the case of this
invention, the adverse effect on the frequency characteristics due to the nodal vibration of the
edge portion generated in the middle range is also only the internal part in the case of actually
vibrating. Since the condition of development is also small, it can be suppressed to the minimum.
Further, the outer peripheral portion is supported by the plastic edge 21 and the rigidity in the
direction perpendicular to the vibration direction is remarkably large as compared with the
conventional edge, so that the lateral vibration of the cone diaphragm can be suppressed. More
than the above, the present invention measures the efficiency improvement of the speaker by
combining the material with the above material and the material with less compliance such as
plastic with the material with the larger compliance such as foam and rutan at the inner
periphery of the edge portion, It is possible to prevent the disadvantages of the conventional free
edge by preventing the vibration of the diaphragm by using the joint vibration of the edge
portion and the rigidity of the plastic, and it is possible to provide an efficient speaker with good
frequency characteristics.