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JPS5622893

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DESCRIPTION JPS5622893
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a honeycomb block, FIG.
2 is an enlarged top view of a portion of the honeycomb block, and FIG. 3 is a honeycomb core
formed by stretching the honeycomb block. 4 is a side view before bonding a surface material to
the same honeycomb core, and FIGS. 5A, 5B, 5C are each manufacturing steps of a honeycomb
core of a diaphragm for acoustic equipment in one embodiment of the present invention. FIG. 6 is
a sound pressure frequency characteristic diagram of a speaker using the conventional
diaphragm and a speaker using the diaphragm of the present invention. 1 · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · film adhesive, 4, 4 '· · · · · · surface material '· · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · Slit. C
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diaphragm for
an acoustic device having a sandwich structure in which the surface material is adhered to both
surfaces of the honeycomb core, · · · bending rigidity is lowered in the heating press process
when the surface material is adhered to the nick core The present invention provides a
diaphragm for acoustic equipment. FIG. 1 shows a honeycomb block. The honeycomb block 1 is
formed by laminating metal foils such as aluminum and bonding adjacent foils at regular
intervals as shown in FIG. As shown in FIG. 1, this honeycomb block is cut at a-d ', and the cut
honeycomb block is expanded to have hexagonal C shaped hexagonal cells as shown in FIG. A
honeycomb core (2) can be formed. As shown in FIG. 4, on both sides of this expanded
honeycomb core (2), thermoplastic film adhesives 3, 3 'are disposed, and surface materials 4, 4'
such as aluminum foil are further disposed, and 100 By pressing in a temperature atmosphere of
about 'C to 200'C, the surface material (4) and f4'l were adhered to both sides of the nick core (2)
with a molten thermoplastic film adhesive. As the surface materials 4 and 4 'of this type of
diaphragm, an aluminum foil or the like having a thickness of several tens of microns is used to
reduce the weight of the diaphragm. If the surface material 4, 4 'is bonded by a honeycomb core
(2), heat pressing, the surface material (4). There was a defect that ← was deformed. That is, in
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the heating and pressing step, the air in the cells of the honeycomb core (2) is sealed in the cells
in a state of being expanded by heating, so it shrinks when the air in the cells is returned to the
chamber or island. The internal pressure is lowered and the surface materials (4) and (4 ') are
deformed so as to project into the cells of the honeycomb core. 3 In the above-described
conventional row, in the heating and pressing step, the air in the cells of the nick core is heated
and expanded, the adhesion portion between the foils constituting the cells and the foil is peeled
off, and the hexagonal cells are cylindrical There was a defect that it was deformed into a shape.
As described above, when the cells of the honeycomb core are deformed or the surface material
is deformed, the flexural rigidity of the diaphragm is reduced and the high-resonance frequency
is lowered. In addition, each cell is resonated. There is a defect that causes distortion. The present
invention eliminates the above-mentioned conventional drawbacks, and one embodiment of the
present invention will be described together with (q) in FIG. In FIG. 5, (5) is a foil constituting the
nick core, this foil (5) is laminated, and adjacent foils (5) are bonded with an adhesive (6), A
honeycomb block (1) as shown in FIG. (B) is formed.
A plurality of slits (7) are formed at the upper edge of the honeycomb block (1). In addition, the
formation location of a slit (7) is a location which is not adhere | attached between foil (5), and
the dimension of the dimensioned slit (7) is about 0, j-0.3 mm. The honeycomb block (1) shown
in FIG. 5 (B) is an arrow (b). 展 When stretched between the two sides, a honeycomb core (2) is
formed that shoulders hexagonal cells as shown in Fig. 5 (q), and slits (7) are formed in the upper
part of the wall between the cells It is The film adhesive is disposed on both sides of the
honeycomb core (2) shown in FIG. 6 (Q), and the film adhesive H is melted by disposing the
surface material on the film adhesive H and heating pressing the honeycomb core The surface
material is adhered to both sides of 2. In the above embodiment, the slits (7) may be formed only
in the upper edge of the honeycomb block, or the slits may be formed in at least one of the upper
edge and the lower edge. Thus, according to the present invention, since sulfur is formed
between the cells, even if the air in the cells expands due to the heating at 100 ° C. to 200 ° C.
in the heating press furnace, After the heating step, even if the temperature returns to room
temperature, the air flows through the slit, and the cell shape is not deformed or the surface
material is not deformed, and the bending rigidity is not reduced, There is no reduction in high
frequency resonance frequency or distortion. FIG. 6 shows the sound pressure frequency
characteristics of a 25 cm-aperture speaker using a conventional diaphragm and the diaphragm
of the present invention. According to the conventional loudspeaker using the diaphragm, since
the bending rigidity of the diaphragm is lowered as described above, the high-resonance
frequency is lowered as shown by (3) in FIG. In the speaker using the diaphragm of the above, as
shown by (7) in FIG. The present invention is configured as described above, and according to the
present invention, in the bonding process of the facing material, bending rigidity does not
decrease, high region resonance frequency does not decrease, and a reproduction frequency
band is wide. Also, a diaphragm with little distortion is obtained.
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