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<Industrial Field of Application> The present invention relates to a bellows-shaped speaker edge.
Conventionally, roll edges, fix edges, and the like have been known as speaker edges, but all are
ring-shaped members that expand from the peripheral edge of the diaphragm toward the outer
periphery, and the outer diameter of the edge. Is generally much larger than the actual outside
diameter of the diaphragm. <Problems to be Solved by the Invention> As described above, since
there is conventionally a large edge of the outer diameter on the outer periphery of the
diaphragm, 40 to 50% of the entire area of the completed speaker is viewed from the front. As a
result of being occupied by parts other than the diaphragm such as an edge or a frame, the
speaker becomes large, the diameter of the speaker that can be attached to the speaker box of a
certain size becomes small, or the speaker box becomes large. ing. The present invention has
been made in view of such problems and to reduce the area as viewed from the front of the edge.
In order to achieve the above object, according to the present invention, the edge of the speaker
is formed in a bellows shape so as to be axially expandable. Since the edge of the present
invention is bellows-like and does not expand in the outer peripheral direction of the diaphragm,
the area viewed from the front is small, and the speaker can be miniaturized. Next, an
embodiment of the present invention shown in the drawings will be described. FIG. 1 is a crosssectional view of a speaker using an edge according to one embodiment, in which (1) is an edge
according to the present invention, (2) is a diaphragm, (3) is a frame, and (4) is a damper. , (5) is
a voice coil, and (6) is a magnet. The edge (1) is bellows-like having three arc-shaped folded
portions (1a) and has a short cylindrical shape as a whole, and the front end face is adhered to
the outer periphery of the diaphragm (2). The rear end face is adhered to the outer periphery of
the frame (3). The edge (1) of this embodiment is configured in this way and can be axially
expanded and contracted so that vibration of the diaphragm (2) is free because it is bellows-like,
and in the direction perpendicular to the axis It has a certain strength, supports the diaphragm
(2) securely, has no air permeability, etc., and its function is completely the same as that of the
conventional edge, and it has all the characteristics to be possessed as the edge, and from the
front There is a feature that the viewed area is extremely small compared to the conventional
example, and the ratio of the area of the diaphragm (2) to the entire area can be significantly
improved. FIG. 2 is a view for explaining this relationship, and in the case where the diaphragm
(2) is attached to the same frame (3) using the edge (1) of the present embodiment, a solid line
shows an edge (11 of the conventional example). The case where the diaphragm (12) is attached
by using is shown by a broken line.
?????????????????? The diameters of the diaphragm (2) and the diaphragm
(12). In this case, the ratio of A: B: C is 100: 87: 69, and the area ratio is 100: 76: 48. The area
ratio of the diaphragm (2) to the diaphragm (12) is 76/48 = 1.58, which is a significant increase
of 58%. This figure is a somewhat extreme example, but it is extremely easy to make the area of
the diaphragm about 30 to 45% larger than the conventional one with a speaker of the same
outer diameter. As the material of the edge (1), it is theoretically possible to use any of the
materials conventionally used as the edge material, but in order to form in a bellows shape, for
example, a forming process is suitable, so 1 paper More than cloth. The use of a material that is
easy to mold and process, such as a rubber-based material, a synthetic resin-based material such
as polyurethane foam, or a thermoplastic elastomer is easier to manufacture. As the shape of the
edge (1), the cross-sectional shape of the folded portion (la) may be one other than the arc shape
as shown in FIG. 1, eg, an acute angle, and the number of folded portions (1a) is also minimum. It
is free from one to a suitable plural number, and the shape, number, etc. of the folded portions
(1a) can be changed as appropriate, and the overall shape seen from the front is not limited to a
circle, and may be oval or square. For example, the shape may be adapted to one combined
diaphragm. FIGS. 3 to 5 show an embodiment having a different shape. Fig. 3 shows the front
end extended inwards and adhered to the front outer periphery of the flat diaphragm (2), Fig. 4
shows the accordion shape with four folded parts (1a), Fig. 5 shows The example which made the
return part (1a) an acute angle is illustrated, respectively. <Effects of the Invention> As is
apparent from the above embodiments, the edge for a speaker according to the present invention
is formed in a bellows shape. It is characterized in that the area seen from the front is greatly
reduced while having all the various characteristics to be provided as an edge. Therefore, the
aperture diameter of the diaphragm can be made larger than that of the prior art with respect to
the external dimensions of the entire speaker, and when the diaphragm has the same dimensions,
the speaker box that can be attached becomes small, and conversely On the other hand, it
becomes possible to attach a speaker of a diaphragm larger than before. In addition, in order to
improve the space factor when attached to a speaker box in recent years, a square speaker has
been manufactured, but the edge of the present invention is effective in improving the space
factor, and such a square It is particularly effective when used for a speaker.
Brief description of the drawings
The drawings are sectional views of a speaker using the speaker edge according to one
embodiment of the present invention, FIG. 2 is a comparative explanatory view with the
conventional example, and FIGS. 3 to 5 are sectional views of other embodiments. .
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