| 摘要 |
A cooling device for cooling a to-be- cooled object without using a forced cold air circulation system for forcibly circulating cold air. The cooling device is at a practical use level and with which sufficient cooling effect can be achieved. A cooler (18) is provided in a chamber heat-insulated from the outside, and a cooling fan (20) is provided in front of the cooler (18). A space in front of the cooling fan (20) is set as a cooling chamber (22) where the to-be-cooled object is placed. Cold air behind the cooling fan (20) is sucked by the fan to cause the air to flow to the cooling chamber (22). The relation a/D = 1/2 to 1/4 is satisfied, where a is the dimension in the front-back direction of a gap between the cooler (18) and the cooling fan (20), and D is the diameter of the cooling fan (20).
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