| 摘要 |
<p>PURPOSE:To improve reliability and assembly workability and permit the com pact structure by reducing the number of parts, in a detecting device for detecting a 'pachinko' ball in noncontact manner. CONSTITUTION:An oscillation circuit using a coil and a condenser and a switching circuit which is tuned-ON/OFF according to the oscillation state of the oscillation circuit are installed on a circuit substrate 13, and a through hole 51 for the passing of a 'pachinko' ball is formed. On the periphery of the through hole 5i on the circuit substrate 13, a wiring pattern 52 is formed, and the coil of the oscillation circuit is constituted according to the wiring pattern 52.</p> |
