| 摘要 |
PURPOSE:To provide the cover opening/closing detection mechanism for a small- sized easily waterproofable radio telephon system by constituting the cover opening/closing detection mechanism by the contact of the contact points of a key sheet and a substrate. CONSTITUTION:When a cover 2 is closed, a projection 8 provided on the cover 2 presses a cover opening/closing detection button 17 integrally provided on the key sheet 16 and it is detected that the cover 2 is closed by the contact of a first contact point 18 on the side of the key sheet 16 and a second contact point 21 on the side of the substrate 11. Also, when the cover 2 is opened, the depressed state of the button 17 is cancelled and the contact of both contact is released by the elastic recovery of the entire key sheet 16. Also, since the cover opening/closing detection mechanism is constituted in such a manner, it is not required to directly form a hole in a casing 10 and water and bust are prevented from intruding inside the casing. |
