| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a thin voice coil which excels in the heat resistance at a low production cost by forming an insulating coat on the surface of a material, where a coil pattern is printed with use of the conductive resin by coating the heat resisting resin. SOLUTION: A coil pattern 2 is printed on the surface of a bobbin sheet 1 and the polysiloxane group heat-resisting resin is thinly coated over the pattern 2. Thus, an insulating coat is formed on the surface of the sheet 1. The materials of a voice coil bobbin include a ceramic film or such materials as aluminum, titanium, a magnesium alloy, etc. Furthermore, the voice coil bobbin can use the materials of organic films, having high heat resistance such as polyimide, polyether sulfone, polyether imide, etc. Thus, the pattern 2 is printed on the coating of the polysiloxane group heat resisting resin, and the surface of the sheet 1 is coated by resin. In this way, a material having a multilayer structure can be easily obtained.</p> |
