| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-stage refrigerator capable of surely cutting off thermal connection in a thermal switch when the thermal switch is off even in the case where axial direction of the thermal switch is arbitrarily positioned, and capable of exercising sufficient convection heat transmission effect. SOLUTION: The multi-stage refrigerator is equipped with a first refrigerating end of which lowest achieving temperature and refrigerating performance are high and a second refrigerating end of which lowest achieving temperature and refrigerating performance are low and a thermal switch for being switched from thermal-connection-on to thermal-connection-off at a predetermined temperature with which the first refrigerating end and the second refrigerating end can be thermally connected. The multi-stage refrigerator refrigerates an object to be refrigerated to a cryogenic temperature by attaching the object to be refrigerated to the second refrigerating end in a thermally connected manner. A gas solidification chamber for communicating with inside of the thermal switch via a tube at a side of the second refrigerating end of the thermal switch is also provided and at least part of the gas solidification chamber is thermally connected to the second refrigerating end. COPYRIGHT: (C)2006,JPO&NCIPI
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