| 摘要 |
PURPOSE:To improve the workability in inserting a coil winding and to enable formation of a gap to an exact size by forming a joint layer over the entire surface on the joint surface side of a core, removing the joint layer in the part constituting a through-window for inserting the coil winding to expose the core ground surface and adhering the same by glass. CONSTITUTION:A thin film 17 of a ''Sendust'' alloy composed of 6.2wt% Al, 9.6wt% Si, and 84.2wt% Fe is stuck on the joint surface side of base plates 11, 12 composed of high melting glass having high hardness. The thin film 17 is stuck by a high frequency sputtering method in an Ar atmosphere kept at about 10<-2>Torr. SiO2 18 is stuck at about 1,500Angstrom on the film 17. A photoresist 19 is coated thereon except a notched groove 13 and a part 12' and is masked thereon by a photolithographic technique. The base plates are then dipped in an HF- NH4F etching soln. to remove the SiO2 in the groove 13 and the part 12'. Low meling glass 20 is inserted into a hollow groove 14 and after the base plates 11, 12 are sandwiched, the plates are heated in an inert gaseous atmosphere or vacuum to melt and adhere the glass 20 to the part except the groove 13 and the part 12'. A core block assembly 21 is thus obtd. |
