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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal cross-sectional view of an
essential part of a conventional edgeless speaker, and FIG. 2 is a longitudinal cross-sectional view
of the main part of the edgeless speaker according to the present invention. is there. 6 is a
composite diaphragm made of a composite plate, 6a is a core material made of a honeycomb
plate, 6 is a skin, and 7 is an adhesive forming a resin material.
[Detailed description of the invention] Book: J: Esoggiless steel with a honeycomb and a
composite plate made of a honeycomb and a core formed by applying a skin to both of them,
especially the periphery of the composite plate This book is intended to avoid unnecessary
radiation caused by the misalignment of the part end l. In the case of a normal cone-shaped
speaker, + EJ flexible Eso is on the peripheral portion of various sheets (hull 1 paper, plastic,
special fiber cloth, non-ferrous metal thread, etc.) formed in the fi- or pseudo-conical shape. It is
made to be the aspect supported by the frame with / members. However, the expected edge
member produces a large disturbance t on the speaker's circumference il + ии ? ? ? ? ?
иииииииииииииииииииииииииии Therefore, the sound quality is also bad. There is an edgeless speaker as shown in
Fig.1. In the figure, (1) is a frame, (2) is a diaphragm made of the sheet as described above, and
(3) is an annular reinforcing member joined to the outside of the peripheral portion of the
diaphragm (-). A uniform gap (5) is provided between the reinforcement member (4) and the
inner periphery of the frame (1) to obtain an acoustic impedance of the value given. By the way, I
mentioned above! Between J (51 acoustic in and и dance is essential to secure the low range, or in
practice the value must be quite large, so the length y of the gap (5) should be as small as
possible?, and clearance C '%: It is necessary to set as small as possible. In this case, if the
clearance C is made too small, contact between the inner periphery of the frame il + and the
reinforcing member (4) is likely to occur due to the diaphragm (inclination of two rings or one
core). It is thought that the method of covering and lengthening Q is a verb. However, as the
length l'4 increases, the mass of the reinforcement (2 in i, the historical material (4) inevitably
increases, and as a result, the vibration characteristics of the diaphragm (2), particularly the
influence on the divided vibration increases. Significantly reduce the speaker characteristics.
Therefore, it is conceivable to use a composite plate comprising a honeycomb plate and a skin as
a diaphragm of such an edgeless speaker. This composite board is obtained by coating a skin on
both sides of the honeycomb board core material. Therefore, it is possible to realize an imaging
plate with a large size and a large size while being lightweight. For this reason, l! J Darkness (The
length of 51 can be reduced and the clearance C can be reduced. However, since such a
composite plate was used as a diaphragm as it is: 10, there is a possibility that unsteady radiation
may occur to deteriorate the sound quality because the honeycomb plates are not completely
SUMMARY OF THE INVENTION The present invention has been made in view of the above
circumstances, and an object of the present invention is to provide an edgeless speaker in which
unnecessary radiation caused by the irregular cross section of the honeycomb plate forming the
composite plate is eliminated. An embodiment of the present invention will be described below
with reference to FIG. (3)) FIG. 2 is a longitudinal sectional view showing the main part of the
edgeless speaker according to the present invention, (1) showing a frame, (6 (showing a flat
composite diaphragm disposed inside thereof The composite diaphragm (6) of this example deals
with both + fo & c skins (6a) (aluminum foil, Berylly titanium dioxide, carbon 7 Ihah, other 4
sheets each) of the core material (6a) consisting of a honeycomb plate. The combination board
and the one which is "wasteful", such a pan and swing & + 61-t thing is already known. That is,
this i: Um 'iM board's curvature 1] is made large and the speaker's performance characteristics
(in the case of woofer-middle, high range) Y & 1! It has been recognized that it is intended to be
completely insane, and that in practice there are considerable advantages and advantages. In the
present invention, [C] is a rubber- or resin-based adhesive in which a crow balloon is mixed with
the end face of the peripheral portion of the composite flat plate (6) shown in the drawing. A
foamable adhesive (7) is applied in a filling manner. As a matter of fact, where the end face with
unevenness corresponding to the hexagonal column or the end face of the peripheral edge
portion of the composite diaphragm t61 is formed as it is, the peripheral end face stiffening (4)! 1. ,,, (Can be done. For this reason, the unnecessary radiation resulting from the unevenness |
corrugation is eliminated. In this example, the mass of the compound moving plate (6) as a whole
is small, and its thickness is about 101 m1 and its bending rigidity is sufficiently large. Not only
can the space j51'5 'be added with the required space between the inner circumferential surface
of the flange il + without spending any members, but also with the inner circumferential surface
of the frame (1) at the time of driving Since there is no concern that a composite mobile board (a
contact state with the peripheral end face of the phrase may occur, it is possible to exert the
inherent immersion characteristics of the edgeless speaker. In addition, although the flat-shaped
edgeless speaker has been described in the above embodiment, it will be easily understood that
the present invention can be applied to a cone-shaped edgeless speaker and the like. As
described above, according to the edgeless speaker of the present invention, since the w fat
material is disposed in at least the honeycomb temporary #lf [l of the composite plate used as the
peristaltic plate, it is necessary to prevent the radiation of unnecessary sound? it can. (5) The
present invention is not limited to the above-described embodiment, and various modifications
can be made without departing from the scope of the invention.
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