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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional fulldrive speaker. FIG. 2 is a cross-sectional view of the same loudspeaker diaphragm, and FIG. 3 is a
full-seven 7-drive loudspeaker of this invention. FIG. 31a is a base, 31b is an insulating oxide
film, and 31C is a coiled conductor.
DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to an
improvement of a diaphragm for forming a full drive type speaker (in particular, the
improvement of the heat resistance of the diaphragm. The full drive speaker will be described
with reference to FIG. 1. A coiled conductor is formed in the magnetic gap formed by the center
ball 2 and the front plate 3 of the magnetic circuit consisting of the magnet 11, the center ball 2,
the front plate 3 and the back plate 4. The diaphragm 5 is formed in parallel with the magnetic
flux in the front air magnetic gap, and an audio current flows through the conductor to vibrate
the diaphragm 5 so that sound waves are emitted into the atmosphere. ,,,! + IJ 2 In such a full
drive speaker, the diaphragm 5 is made as shown in FIG. 2 (generally, a polymer material such as
polyester or polyamide is used as the base 5a, and at least -II of the base 5a) The coiled
conductor 5b made of aluminum or the like is formed by etching or vapor deposition. In such a
speaker, since a voice current flows through the coil 5-b, Joule heat is generated and the
diaphragm substrate is formed. 5a is heated. Therefore, although the human-resistance
characteristic of the speaker is determined by the heat-resistance characteristic of the diaphragm
substrate 5a, the limit of 400 ° C. front grain is at most a limit when using the conventional
polymer material. In order to further improve the heat resistance of the diaphragm substrate (in
order to further improve the diaphragm substrate, the heat-resistant metal foil is used as the
diaphragm base (... And the coiled conductor is formed through the insulating oxide layer formed
on the surface). The history will be described in detail with respect to the embodiment shown in
FIG. 3 which is a fully driven diaphragm formed. In FIG. 3, a diaphragm substrate 31a is, for
example, a metal foil such as aluminum, and at least one surface thereof is alumite-treated to
form an aluminum oxide layer 31b. The aluminum oxide layer 31b insulates the conductor
formed on the aluminum oxide layer 31b, and further improves the heat resistance of the
diaphragm substrate. As in the prior art, the coiled conductor 31C of aluminum, copper or the
like is formed by etching or vapor deposition as in the prior art. As described above, the
diaphragm of the full drive speaker according to the present invention uses metal foil such as
aluminum as its base, and since the insulating oxide layer is formed on the surface, the heat
resistance is extremely improved. I can do that. For example, when the above-mentioned
aluminum substrate is subjected to near-alumite treatment, it can withstand up to about
Father In the above-mentioned example of the right, although aluminum was described, the same
effect can be obtained even if there are two other gold groups capable of forming an insulating
oxide film. 1 is a cross-sectional view of a conventional full-drive speaker. FIG. 2 is a crosssectional view of the same speaker diaphragm, and FIG. 3 is a cross-sectional view of the fulldrive speaker diaphragm of this invention. is there. 31a is a base, 31b is an insulating oxide film,
and 3tC is a coiled conductor. Practical 7 I 二 出 オ ン Onkiyo Co., Ltd. Attorney Attorney
Attorneys Satoshi I Yu 3 I; = 1: · · 2 first × S Shiri Q 2nd division 1b 3 JC 31 α 3rd division 5668
utility model applicant Applicants Onkiyo- Co., Ltd. H-Pan i i
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