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JPS56165489

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DESCRIPTION JPS56165489
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a conventional flat panel
loudspeaker, FIG. 2 is an enlarged sectional view of a flat panel loudspeaker according to the
present invention, and FIG. 3 is a characteristic chart. 1 is a diaphragm, 2 is a honeycomb core
13 is a surface material, 4 is a synthetic resin, 5 is a voice coil.
[Detailed Description of the Invention] In the present invention, the lower surface facing material
of the flat diaphragm, sandwiching like a sandwich in the surface material with the nick core as a
core, is impregnated with a synthetic resin to increase the human resistance. It relates to a flat
loudspeaker. Conventionally, as shown in FIG. 1, the center pole 7, the magnet 8, and the plate 9
constitute a magnetic circuit, the center pole 7 and the plate 9 form a magnetic gap, and the
frame 10 is attached to the upper surface of the plate 9. The winding portion 7dy2f'2 of the
voice coil 5 is disposed at the center of the voice coil 5, and the voice coil 5 is held in the center
by the damper 11 which adheres the outer peripheral end to the inner bottom of the frame 10.
The upper end of the bobbin of the voice coil 5 is attached with adhesive 6 to the lower surface
of diaphragm 12 in which the sheet material Q surface material is attached to both sides of a flat
plate honeycomb core formed of The inner peripheral edge of the edge 13 having an annular
cross-sectional circular shape is adhered to the outer peripheral edge of the plate 12, and the
outer peripheral edge of the edge 13 is adhered to the outer peripheral edge of the frame 10. In
this case, since the surface material of the diaphragm 12 is pushed and bent in the direction of
movement of the voice coil bobbin, wrinkles enter the surface of the surface material, and the
surface facing material is only entanglement of fibers. There was a drawback that delamination
of the surface material occurred. The present invention was devised to eliminate the abovementioned drawbacks, and if the embodiment shown in the drawings is described, as shown in
FIG. The front surface 3 of the material is attached to both sides of the flat plate-like cam core 2
formed on the lower surface of the diaphragm 1 of the voice coil 5 of the lower surface 3 of the
diaphragm 1 A relatively strong synthetic resin 4 such as epoxy, ananoacrylate, polyester, acrylic,
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etc. is impregnated and reinforced in the surface material 8 of the portion where the honeycomb
core of the present exists, and the bobbin of the voice coil 5 is bonded to the V center of the
reinforcement portion. It is a flat speaker having a structure bonded with an agent 6. Since the
present invention is structured as described above, the adhesion vicinity of the voice coil bobbin
becomes hard. Therefore, as shown in FIG. 3, the custom-designed solid line shown by the solid
line of the present invention is compared with the conventional custom-order indicated by dotted
line. As a result, the high frequency range reproduction band is expanded, the movable plate l is
lightweight, and the input resistance is increased. When impregnating the entire lower surface
material 3 with the effect of resistance, the surface material requires four or more fingers of the
same amount as the weight of the weight, and the moving plate becomes heavy, which reduces
the efficiency. The synthetic resin 4 impregnated portion should be limited to the side facing the
voice coil 5 bobbin sticking portion, and the weight is increased and the effect is not improved.
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