| 摘要 |
<p>PURPOSE:To prevent a decline in the performance of a rectifier by providing a plastic cover which is installed at an open edge at a recessed part in a blockaded state so as to cover a plastic layer for airtight sealing and by providing a leg part which is installed at the cover and is buried into the plastic layer for airtight sealing so that it can prevent the cover from being detached. CONSTITUTION:At a cover 9 a hole 9a to be used for leading a lead wire 7 is made, and at its periphery a flange 9b which fits the open edge of a disc 4 is provided. In addition, a ring-shaped leg part 9c is provided in such a way that it is buried into a silicon rubber layer 8 and that the cross section of its tip part is T-shaped. It is inevitable that a gap is formed between the hole 9a at the cover 9 and the lead wire 7. Even when salt water enters the inside through this gap, the distance along the surface between the lead wire 7 and the disc 4 is made longer because the distance is actually a long distance along the inner surface of the cover 9 and the peripheral surface of the leg part 9c, and, therefore, the electrolysis is difficult to generate between the lead wire 7 and the disc 4. Therefore, it is possible to effectively suppress the corrosion of the lead wire 7 and the disk 4 and to prevent the deterioration of a rectifier 2.</p> |
