| 摘要 |
PURPOSE:To obtain an electric conduction to a piezoelectric buzzer positioned at the reverse side of a circuit board from its front side with the aid of solid coil spring. CONSTITUTION:A coil spring 4 is thrown at the position decided by a recessed part of the case 6 and a pin, and a circuit board 5 is screwed to the case 6 from upward. When a reverse cover 1 stuck by a piezoelectric buzzer 3 is fixed to the case 6 by screwing in such condition, a pattern at the front of the circuit board 5 and piezoelectric buzzer 3 are made electrically conductive. In order to ring the buzzer 3 actually said electric conductions are provided at two locations. |
