| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem wherein it is difficult to produce a metallic cylindrical body having desired pressure proof property, a large diameter, and a thin wall with reduced cost, although it is possible to provide a refrigerator having high performance by enlarging the diameter of the metallic cylindrical body constituting cold head of the refrigerator and making its wall thin. SOLUTION: At least one reinforcing region constituted by at least one thick-walled part is provided in the metallic cylindrical body constituting the cold head of the refrigerator. COPYRIGHT: (C)2004,JPO
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