| 摘要 |
PURPOSE:To simplify the structure of the titled waterproof device by covering the device having a drip preventive structure with a dome having an open bottom part, and submerging the device under water. CONSTITUTION:The drip preventive device 7 is covered with a circular cylindrical waterproof dome 9 having an open bottom surface to form the waterproof type device. In a case where the device was submerged under water 5, water corresponding to the inside atmospheric pressure of the waterproof dome 9 only infiltrates into the vicinity of the bottom part of the waterproof dome 9 at the inner part of the waterproof dome 9. Therefore, the drip preventive device 7 is installed at a position where air exists constantly to carry out water prevention. |
