近几年来,在电真空工业方面随着电子管用途的日益广泛,其结构也有着复杂多变的形式.在制造工艺中,有的需要玻璃和金属焊接;有的陶瓷和金属焊接;有的玻璃和金属、云母焊接等等.例如有些计数管和X光管,为使穿透能力弱的射线有高的透过率,则须采用云母窗和管壳(金属)及玻璃三者焊合的结构,以便软射线能充分透过很薄的云母片. In recent years, in the vacuum industry, with the increasing use of electronic tubes, the structure also has a complex and changeable form.In the manufacturing process, some require glass and metal welding; some ceramic and metal welding; and some glass And metal, mica welding, etc. For example, some counting tubes and X-ray tubes, in order to weak penetration of the rays have a high transmittance, you must use mica window and the shell (metal) and glass three welding Structure, so that soft rays can fully penetrate the thin mica.