Abstract: An air-cooled case enabling automatic setting of a flow of cooling air during natural cooling and during forced cooling contains a heating element and a cooling fan in a space surrounded by multiple surfaces that include a top surface and mutually facing side surfaces. The air-cooled case is provided with a top surface ventilation opening formed in the top surface, side surface ventilation openings formed in the side surfaces, and a shutter that is provided in the top surface ventilation opening and opens/closes the top surface ventilation opening.

Abstract: An air-cooled case enabling automatic setting of a flow of cooling air during natural cooling and during forced cooling contains a heating element and a cooling fan in a space surrounded by multiple surfaces that include a top surface and mutually facing side surfaces. The air-cooled case is provided with a top surface ventilation opening formed in the top surface, side surface ventilation openings formed in the side surfaces, and a shutter that is provided in the top surface ventilation opening and opens/closes the top surface ventilation opening.

Abstract: A cooling trap unit including a vacuum vessel with a drain port, a refrigerator connected to the vacuum vessel such that an endothermic unit is located on a vacuum side, and a cooling panel which is fixed to the endothermic unit to be in tight contact with it and condenses or solidifies gas, includes a water reservoir unit capable of storing liquefied liquid in the vacuum vessel, when liquefying the gas condensed or solidified by the cooling panel and discharging the liquid outside the vacuum vessel, such that the liquefied liquid is in contact with the cooling panel, and a detection unit for discharging the liquid stored in the water reserving unit through the drain port based on a detection signal which is obtained by detecting a change in temperature of the liquid and indicates that the temperature reaches a predetermined value