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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 showing an essential part of one embodiment of the
present invention, and FIG. 3 is a cross-section showing an essential part of another embodiment.
FIG. 1 ································································································································ Voice coil, 6 ····· · · · · · · · · · · ·
· · · · · · · · · · Center pole, 7 · · · · · · · · Dan / S, 8 + · · · Frame, 8a · · · · · · flat portion, 8b · · · · · · · · Side
wall, 8c · · · · Outer peripheral surface, 8 d ··· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · Dust cap, 11 · · · · · · · · Gasket, 12a ·········································································· Adhesives.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker which
allows the bent portion of the frame to serve as a center offset of the adhesive or the gasket by
providing a ridge on the outer periphery of the gasket and to keep the appearance beautiful. .
FIG. 1 shows a cone type dynamic speaker which is used in a large amount in the prior art: 1 is a
cone, 2 is an edge thereof, 3 is a plate, 4 is a mug) net, 6 is a voice coil, 6 is a center A pole, a
wedge -9S27 is a damper, 8 is a frame, 9 is a bobbin, 1o is a dust cap, 11 is an arrow, and 12 is a
gasket. The frame 8 is formed by forming a metal plate in a substantially conical shape, and a
plane fa8a, a side wall 8b facing in the axial direction, and an outer peripheral surface 8C
obtained by bending the entire periphery of the side wall 8b outward Is integrally formed by
drawing. Then, the outer periphery of the edge 2 is placed on the flat portion 8a to hold the cone
1, and the arrow sheet 11 on the ring is placed thereon, and the ring-like gasket 12 is placed
thereon, The outer peripheral surface is adhered to the inner surface of the side wall 8b of the
arrow paper 11 and the frame 8 with an adhesive. However, with this configuration, cracks and
wrinkles specific to drawing which occur in the bent portion 8d between the side wall 8b and the
outer peripheral surface 8C at the time of drawing appear directly on the outside of the gasket
12 and the quality of the speaker is significantly reduced. There's a problem. Further, the
adhesive applied between the bottom surface of the gasket 12 and the arrowhead 11 and
between the outer peripheral surface and the side wall 8b protrudes into the bent portion 8d,
which also causes a problem that the appearance of the speaker is impaired. Furthermore, it is
extremely difficult to bring the inner circumference of the side wall sa of the frame 8 into close
contact with the outer circumference of the gasket 12 accurately all over the circumference.
There is also a problem that arises. The present invention provides a speaker that solves such
conventional problems at once with a simple configuration. An embodiment of the present
invention will be described below with reference to FIG. In FIG. 2, parts having the same
functions as those in FIG. And 12 & is a protrusion integrally formed on the entire outer
periphery of the gasket 12, and 12 is a recess formed on the entire region under the outer
periphery of the gasket 12 by forming the protrusion 12 a. In the above configuration, when the
adhesive 13 is applied to the boundary portion between the arrow 11 and the side wall 8b and
the cass gnot 124 is pressed there, the adhesive 13 only flows into the recess 12b to the bent
portion 8d of the frame 8. There is no spill.
Further, since the bent portion 8d is completely covered by the protrusion 12 &, the protrusion
of the adhesive 13 is also prevented by this, and cracks and wrinkles produced in the bent
portion 8d are also wrinkled by the protrusions 12 and 1. . Furthermore, since the protrusion
12a protrudes to the outside of the side wall 8b, even if the center of the force pocket 12 is
shifted and a gap is generated between the outer periphery of the gasket 12 and the inner
periphery of the side wall 8d, this is covered by the protrusion 12a. It can be published. Thus, the
overall appearance of the loudspeaker can be made extremely beautiful. Of course, the ridges
12a and the recesses d12b are not limited to the shape shown in FIG. 2, but may be shaped as
shown in FIG. Further, in the case where the protrusion of the adhesive can be completely
overshadowed only by the protrusion 12a, it is not necessary to provide the recess 12b. As
described above, according to the present invention, with a very simple structure in which the
ridges are provided on the outer periphery of the gasket, the crack of the bent portion of the 5
frame, the adhesive protrusion and the gap due to the center displacement of the gasket are
completely covered. Because it can be ripened, the overall appearance of the loudspeaker can be
made significantly L-like.