| 摘要 |
PROBLEM TO BE SOLVED: To provide a speaker which has its high-frequency range reproduction improved as a speaker used for various sound equipment. SOLUTION: To actualize sufficient high-frequency range reproduction, a pattern coil part 4a of a film part 3a of a leaf diaphragm 1a is made of lightweight aluminum, plated with nickel having proper adhesive strength with the aluminum, and further plate with gold to improve anicorrosiveness of the aluminum part and increase the soldering operability of an input signal cord and the pattern coil part. The aluminum material is used for the pattern coil part 4a of the leaf diaphragm 1a, to improve high pressure and make the reproduction range high and the nickel plating and gold plating improve the soldering operability and environment characteristics, such as anticorrosiveness, thereby providing the speaker having high practical value.
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