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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view of a speaker having a
conventional edge, and FIG. 2 is a half sectional view of a speaker having an edge according to an
embodiment of the present invention. 6 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · 12 ..... Supporter.
DETAILED DESCRIPTION OF THE INVENTION j41)-. The present invention relates to an
electroacoustic transducer improved on a suspension edge (hereinafter referred to as an edge)
for supporting an opening edge of a diaphragm relative to a frame. In a general electrodynamic
speaker, for example, as shown in FIG. 1, the bobbin 3 is framed by the damper 5 so that the
voice coil 4 wound around the bobbin 3 is positioned in the magnetic gap 2 of the magnetic
circuit 1. The base of the diaphragm 70 is attached to the bobbin 3 and the opening edge of the
diaphragm T is supported by the edge 8 at the 7 frames 6. The damper 5 and the edge 8 hold the
bobbin 3 and the diaphragm T so as to keep the bobbin 3 and the diaphragm 7 in precise piston
movement, but the edge 8 further performs the peripheral holding operation, It is a member
which has the largest influence on the vibration of the vibration E plate T. There is an edge KFi
like a grain, a roll edge shown geometrically in the figure and a shaped edge not shown, and a
fixed edge integrally formed with a free edge consisting of the diaphragm and a member
according to the relationship with the diaphragm. There is one, the former 7 Lee enoji is used for
low tones with low lowest resonance frequency fo, the latter fixed edge is used for medium to
high tones whose fo is relatively high. By the way, such an edge is conventionally formed by, for
example, cutting a woven fabric or a non-woven fabric into a predetermined size in the free edge,
as a base material, impregnated with a thermosetting resin, and press-molded it, or a resin foam
sheet is pressed. Although it is obtained by molding and forming, in this method, the variation
between products is large, and selection of materials for obtaining た め J required fo is difficult.
Further, impregnation of the resin is to prevent deformation after molding, but the pinhole and
the resin concentration at that time also greatly affect the air permeability and the above-
mentioned fo. Furthermore, there is a frequency range (piston motion range to reverse resonance
range) that does not match the movement of the damper when it is incorporated into a speaker,
and this range is a tip on the frequency characteristic of sound pressure. Can be admired. The
present invention has been made in view of the problems of the conventional edge as described
above, and provides an electroacoustic transducer having an edge adapted to support the
opening edge of the diaphragm using the elasticity of the honeycomb-shaped material. It is
Hereinafter, one embodiment of the present invention will be described with reference to FIG.
Fig. 2 is for the electrodynamic speaker). It consists of an upper edge 9 and a lower edge 10
which are cut in an edge-like form, and the upper edge 9 and the lower edge 10 are made of an I.
nick-shaped material by drawing.
This honeycomb-shaped material, aluminum foil or other lightweight metal sheet, or a
lightweight, rigid non-metallic sheet of carbon-containing resin sheet is coated by applying an
adhesive to the front and back, and the bonding effect is After being formed, it is stretched and
formed in the opposite direction to the overlapping direction. The upper edge 9 and the lower
edge 10 thus formed are attached to the intermediate plate 11 and also attached to the upper
side 6 & of the frame 6 and the supporter 2 screwed to the frame 6, In addition, the intermediate
plate 11 is attached to the diaphragm T, and the speaker is assembled into the speaker. In this
installation, when the voice coil is positioned at the center of the magnetic gap when the input
signal to the speaker is zero, the middle plate 11 is positioned between the upper edge 6 of the
frame 6 and the hinge of the supporter 2 You need to set it to As a result, the upper edge 9 and
the lower edge 10 exhibit the same elasticity with respect to the intermediate plate 11. In the
above, when the diaphragm T moves upward, the upper edge 9 compresses and the lower edge
10 expands, and when the diaphragm T moves downward, the upper edge 9 expands and the
lower edge 10 compresses. Do. As described above, since the upper edge 9 and the lower edge
100 respond to the vibration of the diaphragm T very well, the followability is very good, and the
movement of the damper can be matched, and the distortion due to the edge does not occur in
the amplitude. Also, it is not preferable for the voice coil to deviate larger than the magnetic gap
in terms of magnetic efficiency and responsiveness, but in this case the IJ mitt position, ie the
maximum amplitude, is the upper side 1ia of the frame 6 and the supporter 2 or the upper edge.
It can be determined by the maximum extension length of 9 and lower edge 10. Furthermore, in
the direction orthogonal to the vibration direction of the diaphragm T, a large rigidity can be
obtained by the adhesive portions between the sheets constituting the edge, so that the centering
action is performed in a normal manner. In addition, since the softness of the edge can be
determined by the number of sheets to be overlapped, regardless of the shape and material, it is
possible to reduce the variation of to between products, and because a lightweight sheet is used,
it is extremely The speed can be reduced and efficient) 1) one strength! Can be realized.
Furthermore, the resonance point can be changed or the frequency characteristic can be
improved by changing the size of the honeycomb core, or by filling or coating the dump material
in the core material. . From the above, according to the present invention, it is possible to provide
an electroacoustic transducer having an extremely excellent edge in terms of performance and
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