| 摘要 |
PURPOSE:To reduce the number of parts to be attached and to reduce the thickness and the price by insulating the body of a key switch such that the contact of a calculator and a watch including the time elongating contact is kept away from contact with the watch case and the key. CONSTITUTION:A key switch body 30 is composed of a calculating contact 31, a common contact 32 for taking the signals for time elongation and a watch contact 34 as well as a bridge 33 for conducting the contacts 31 and 32 and an insulation holding member 35 covering the former. The watch operating contact 34 is fixed to the insulating member 35 and is electrically isolated from the calculating contact. The inner and outer peripheral portions 37 and 38 of the insulating member 35 are made of an insulating material so that the calculating and watch contact can be prevented from being connected with the watch case and accordingly a battery even if they are held between the upper drum and the inner and outer rings. |
