| 摘要 |
In order to simplify closure thereof, the casing of the resonator comprises a tube (2) which is preferably of glass and a glass ball (4) through which conductive pins (6, 8) are sealed. The ball (4) is sealed into the open end of the tube (2) by a sealing ring (18) of organic adhesive material, preferably an epoxy resin. If the tube (2) is also of glass, the frequency of the resonator may be adjusted by use of a laser after the resonator has been fitted into the casing. <IMAGE> |
