| US 7,600,386 B2 | ||
| Pulse tube cryogenic cooler | ||
| Motokazu Saito, Tokyo (Japan); and Hisae Yamanouchi, Tokyo (Japan) | ||
| Assigned to Sumitomo Heavy Industries, Ltd., Tokyo (Japan) | ||
| Filed on Sep. 26, 2006, as Appl. No. 11/526,810. | ||
| Prior Publication US 2007/0119191 A1, May 31, 2007 | ||
| Int. Cl. F25B 9/00 (2006.01) | ||
| U.S. Cl. 62—6 | 13 Claims |
| 1. A pulse tube cryogenic cooler, comprising:
a pressure vibration generating device configured to generate pressure vibration in operation gas;
a regenerator connected to the pressure vibration generating device;
a pulse tube connected to the regenerator;
a phase control mechanism connected to the pulse tube; and
a heat exchanger provided at an end of the pulse tube;
wherein the heat exchanger includes
a first laminating part where porous plates having piercing holes and first mesh members are mutually laminated; and
a second laminating part where second mesh members are laminated,
wherein the first mesh members have a first mesh member roughness and the second mesh members have a second mesh member roughness
being larger than the first mesh member roughness.
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