| 摘要 |
PROBLEM TO BE SOLVED: To suppress generation of axial deviation between pole-piece and spacer in manufacture of vacuum envelopes, eliminating need of jig for central collimation and problem of joint to the jig. SOLUTION: For the structure of assembling pole-pieces 1 and spacers 2, centering of the vacuum envelope is made simple, when the both are assembled alternately, by using the pole-piece 1 and spacer 2 which has a concave on one side while a convex at the other side.
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