| 摘要 |
PURPOSE:To reduce the manufacture cost by adopting an air-tight base made of an insulating base both sides of which a metallic layer is provided. CONSTITUTION:After a needle-shape terminal 41 is pressed into a through-hole 31 to a substrate [(a) is front side and (b) is back side], a metallic foil 32 and a head of a terminal 41 are soldered. A high temperature solder having >=300 deg.C of melting point is used as the solder. A piezoelectric element made of a crystal substrate provided with electrodes is mounted on the base obtained in this way. That is, the crystal plate 52 as the piezoelectric element is placed on the crystal base 51 and its electrode 53 is connected to the terminal 41 by a conductive adhesives 54. The piezoelectric element like this is mounted onto a lead 42 of the terminal by inserting a ring 62 made of a heat resistant and insulating resin such as ''Teflon'' or phenolic resin thereto and placing a solder sheet 71 for sealing. The oscillator assembled in this way is heated at about 200 deg.C in nitrogen environment so as to melt the sealing solder sheet 71 and the inner wall of a metallic can 61 and a metal foil 36 of the back side of the substrate are bonded. |
