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The present invention relates to improvement of a honeycomb diaphragm used for a diaphragm
of a speaker. The diaphragm of honeycomb structure is made of aluminum, synthetic resin,
lightweight and rigid material as shown in Fig. 1 and carbon fiber or chemical fiber on both sides
of core material (1) formed in honeycomb shape. A skin material (2) impregnated with a resin is
bonded to the formed woven fabric with an adhesive and formed. 9 ordinary diaphragms (a light
weight and high rigidity can be obtained compared to two and widely used as a diaphragm of a
speaker It became so. However, since the skin material to be attached to both sides of the core of
the honeycomb diaphragm is formed by cutting the sheet-like one into a circular shape and
adhering to both sides of the core material, the core material has an entire vibration surface. And
the internal loss does not change, and when the honeycomb diaphragm is incorporated into a
speaker and vibrated, there is a drawback that a large peak is generated due to the division
resonance in the high frequency characteristic. The present invention has been made to eliminate
the disadvantages of the prior art as described above, at the time of molding the skin material. It
is an object of the present invention to provide a honeycomb diaphragm of a speaker in which
the split resonance occurring in the high frequency region is reduced by partially increasing the
internal loss by partially using papermaking in which the press pressure is changed. .
Hereinafter, an embodiment of the present invention will be described with reference to the
drawings. In FIG. 2, 9 (1) is a core material, which is used by forming a thin plate of aluminum or
synthetic resin in a honeycomb shape as in the prior art. (2) is a skin material attached with an
adhesive on both sides of the core material, and this skin material is formed by making a pulp
material. (3) is a sparse portion of the skin material, and (4) is a dense portion of the skin
material, which is obtained by changing the pressing pressure during the skin material forming
process. That is, the sparse portion (3) is formed with a weak press pressure, and the dense
portion (4) is formed with a strong press pressure. The sparse portion (3) and the dense portion
(4) are, for example, sparse on the inner peripheral portion and dense on the outer peripheral
portion as shown in FIG. When the boil coil is built in and vibrated in the inner peripheral part of
the honeycomb diaphragm formed in this way, the internal loss of the sparse part (3) of the skin
material (2) becomes large and the mechanical loss becomes large. It was possible to suppress
the split resonance in the high frequency band and absorb the peak. Also, change the press
pressure during papermaking. Alternatively, the internal loss of the skin material can be
controlled by changing the ratio of density to density. In the above embodiment, the inner
circumferential portion is sparse and the outer circumferential portion is dense, but it is also
possible to provide sparse / dense reversely or randomly, or to add radial / dense sparse / dense.
is there.
As described above, according to the present invention, the speaker capable of suppressing the
occurrence of split resonance in high frequency characteristics by an easy means of partially
changing the press pressure on the skin of the honeycomb diaphragm and providing the sparse
and dense portion. The honeycomb diaphragm of the invention can be obtained.
Brief description of the drawings
FIG. 1 is a longitudinal sectional view of a conventional diaphragm, and FIG. 2 is a longitudinal
sectional view of one embodiment of the present invention.
In the figure, (1) is a core material, (2) is a skin material, (3) is a sparse part, and (4) is a dense
part. In FIG. 1, the same reference numerals indicate the same or corresponding parts. Procedure
Corrective Instructions (, Method) 1, Display of Incidents Japanese Patent Application No. 5852876 2, Title of the Invention Honeycomb Diaphragm 3 of Speaker, Representative of Person
Doing Correction Representative 4 To Ari Katayama Part 4 Agent 5, Correction Instruction Date
of June 28, 1983 (shipment date) 6, full text 7 of the statement subject to amendment, clear
statement of contents statement of amendment (no change in contents) 8, list statement of
attached documents 1 or more Showa in Showa The date of the day 2, the name of the invention
speaker Speaker No. 3, relationship with the case to make correction Patent applicants residence
Tokyo, Tokyo Chiyoda-ku, Marunouchi 2-chome, 2nd and 3rd name (601) Mitsubishi Electric
Corporation Representative Katayama Correct all drawings as per part 8, agent 5, target drawing
6 for correction, and content sheet for correction. 7, attached document correction drawing 1 or