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JPS5734686

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DESCRIPTION JPS5734686
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1A, 1B, and 1C are cross-sectional views of the
main parts of a flat speaker adopting the conventional edge structure, and FIG. 2 is a flat speaker
adopting the edge structure according to the present invention. A sectional view and I11 and H2
of FIG. 3 are explanatory views showing a sticking process of the same edge structure. 1 ...... flat
speaker, 2 ...... flat diaphragm, 9 ...... Etsujihoruda, 11 ...... edge, 12 ...... edge material, 13 ······
Viscoelastic thin film, 15 ·················
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the edge structure
of a flat loudspeaker. The edge structure of this type of flat speaker of this type is, as shown in
(a), (b) and (c) of FIG. 1, in order to obtain the compliance of the amplitude of the flat diaphragm
A, Rolls, reverse rolls, and concentric waves are formed to form an edge B, and this edge B is
adhesively fixed to the plane diaphragm A and the edge holder C. In the case of the edge B of
such a shape, the plane vibration is Since it is not in the same plane as the plate A, the sound
pressure frequency characteristic is disturbed (pick, dip) due to the blue light diffraction and
interference effect. Also, in order to form the edge B into a shape of 1 楚 z Z −5, -5), 2 y roll,
reverse roll, concentric wave, etc., a certain amount of edge is required, and thus the width
becomes wide The edge resonance is apt to occur, and the effective area of the plane diaphragm
A becomes small. Furthermore, since the sticking and fixing of the edge B is performed by the
adhesive ring, there is a disadvantage that the application, sticking, and the like of the adhesive
require a large number of processes. Therefore, in order to solve the above-mentioned defect ts,
the present invention forms an adhesive layer on one surface of an edge-shaped visco-elastic thin
film, and fixes this visco-elastic thin film to a flat diaphragm and an edge holder β garden
attachment by the adhesive layer. It is an object of the present invention to provide an edge
structure for a flat speaker which is free from the disturbance of the sound pressure /
unadditional frequency characteristic and which can simplify the sticking and setting operation
of the edge. Hereinafter, the present invention will be described with reference to an embodiment
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of the drawings. FIG. 2 is a cross-sectional view of a flat speaker adopting the edge structure
according to the present invention, and FIG. 3 (a) to b)) is an edge. It is an explanatory view
showing the pasting process of structure. In the above drawings, 1 is a flat speaker, 2 is a flat
diaphragm, 3 is a voice coil, 4 # i magnetic circuit, 2's, a top plate 5, a magnet 6, a center ball 7, a
back plate 8 And consists of 9けエツジホルダ、10i;iダンパー、1ltljエツジである
。 The edge 11 is formed of the edge material 12, which will be described below with reference
to (a) (b) e (b) in FIG. The edge material 12 has a viscoelastic thin film 13 and two separators 14a
as shown in FIG. 14b and adhesive layer 1 5 are stacked, and the area thereof is sufficiently
larger than the outer peripheral area of the edge holder 9 of the flat speaker. Thus, the
viscoelastic thin film 13 is very thin, 3 [1 in 20] to 100. At position A, it is rich in stretchability,
has excellent durability against repeated 9W movement, and it is best to use polyurethane with
priority to heat and humidity resistance and cold resistance, but it is also butyl rubber, SBR, etc.
And any material that meets the above conditions.
A non-drying adhesive layer 15 is formed on the back surface of the viscoelastic thin film 13, and
the separator 14 b is attached to the adhesive layer 15 or a separator 14 m is non-peelably fixed
on the surface of the viscoelastic thin film 13. . , 3, here, as the separators 14m and 14b,
materials having high flexibility may be used. Then, leaving the upper separator 14m in the
above edge material 12, notches 16m and 16bt are formed on the lower separator 14b and the
viscoelastic thin film 13 ° adhesive layer 15 according to the planar shape of the edge 11. Then,
as shown by (→ in FIG. 3), the separator piece 1 + 1 / + peeled off between the upper one bothcuts 16m and 16b, as shown by (a) in FIG. The adhesive layer 151, which is hollowed by
separation of the separator piece 14W, is attached to the upper surface of the edge holder 9 so
that the outer notch 16m abuts on the outer surface of the edge holder 9, and the edge material
12 abuts on the surface of the flat diaphragm 20. At the time of bonding, the flat diaphragm 2 is
lowered against the elastic force of the damper 10 by the thickness thereof by the lower
separator 14b in direct contact with the diaphragm 2. Then, as shown in FIG. 3), when the edge
material 12 is peeled away from the end, flat vibration is left except for the viscoelastic thin film
piece 13m between the notches 16m and 16b that match the shape of the edge 11. Removed
from plate 2. removed. The inner side of the viscoelastic thin film piece 13m whose outer side is
adhered and adhered to the upper surface of the edge holder 9 is adhered to the outer peripheral
surface of the flat diaphragm 2 by the adhesive layer 15, and the viscoelastic thin film 13m
forms an edge 11 . Thus, since the edge 11 itself expands and contracts due to the amplitude of
the edge 1 lFi plane diaphragm 2 and there is no unevenness on the edge 11, there is no acoustic
diffraction and interference, and no disturbance of the sound pressure frequency characteristic
occurs. In addition, since the edge 11 has a planar shape, the radiation area of the flat diaphragm
2 is increased and the radiation characteristic is improved. In the present invention, as described
above, the adhesive layer 15 is formed on one surface of the viscoelastic thin film 13 having the
shape of the edge 11, and the thin film 13 is adhered and fixed to the flat diaphragm 2 and the
edge holder 9 by the adhesive layer 15. Since the viscoelastic thin film 13 which is the edge 11 is
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in the same plane as the plane diaphragm 2, as a result, there is no acoustic diffraction, no
interference, and the viscoelastic thin film 13 has flat sound pressure frequency characteristics.
Because of the planar shape, the radiation area of the flat diaphragm 2 is increased, and the
radiation rate is improved. Furthermore, since the viscoelastic thin film 13 is adhered and fixed
to the flat diaphragm 2 and the edge holder 9 by the adhesive layer 15 (5 formed on the back
surface, the number of processing of adhesion is compared to the conventional example Can be
significantly reduced.
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