| 摘要 |
PROBLEM TO BE SOLVED: To provide a piston which secures a long stroke and perform a reciprocative motion having a continuous linear operation, by so forming a solenoid coil out of a wiring board having a laminated film as its base as to obtain a small-sized thinned actuator. SOLUTION: A solenoid coil is formed on a flexible printed wiring board as a fine wiring pattern to become a coil. The whole of the printed wiring board is so insulated and so covered with a thermally conductive resin layer as to wind it around a bobbin and as to radiate its heat to the external by storing it in a metal case having a heat radiating effect. Consequently, such a small-sized thin solenoid coil as to be able to deal also with a coil having many turns and a coil having wide width is obtained, and it can be utilized for a solenoid, an electromagnetic valve, a solenoid having a long stroke, a piston capable of a reciprocative motion, and the like. COPYRIGHT: (C)2004,JPO&NCIPI
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