| 摘要 |
<p>PURPOSE: To enhance anti-noise performance against static electricity remarkably and simplify the construction in a detecting device to detect existence of pachinko balls and/or coins. CONSTITUTION: An upper lid 11 and a lower box 12 of a pachinko ball detecting device 1 has carbon fibers of several tenμm long mixed at about 12% by volume into a base material of polycarbonate having mechanical strength and elasticity higher than a certain level. Therefore, both members can be assembled easily by utilizing the mechanical strength and elasticity intrinsic to polycarbonate, and form a box body having electric conductivity in an assembled condition. A circuit substrate 13 and a flexible printed substrate 40 are accommodated inside this electrically conductive box body, whereas existence of a pachinko ball P is detected contract-free based on magnetic change caused by the pachinko ball P passing between arms 31, 32. However, the box which is electrically conductive shows high anti-noise performance against static electricity.</p> |
