| 摘要 |
PURPOSE:To raise the temp. of the top plate of the emitting duct provided to the top surface of a low temp. chamber, to abolish a heater and to reduce power consumption by independently providing the emitting ducts guiding cold air to the low temp. chamber to both corners of the top surface of the low temp. chamber apart from the second partition wall. CONSTITUTION:The fourth emitting duct 22 is provided to the back surface of a low temp. chamber 5 and one end thereof is connected to the third emitting duct 15 and the other two ends thereof are opened to both deep corners of the top surface of the low temp. chamber 5. The fifth emitting duct 23 is connected to the fourth emitting duct 22 and forwardly extend from the interior of both corners of the top surface of the low temp. chamber 5. The fifth emitting duct 23 is formed from an insulating material 24 provided with a plurality of emitting orifices 23a. The cover 25 becoming a part of the top surface of the low temp. chamber 5 is provided so as to cover the heat insulating material 24 and the engaging part 25 of the cover 25 is mounted to the side wall 26 of the low temp. chamber 5 in a contact state. By this constitution, even when the cover 25 is cold by the cold air in the fifth emitting duct 23 through the heat insulating material 24, the difference between the temp. of the cover 25 itself and that of the low temp. chamber 5 is eliminated. |
