PURPOSE: To perform microscopic examination without clouding an optical system lens and a light source aperture window even at a very low temperature by cooling the atmosphere in a chamber to a prescribed very low temperature required for a pertinent sample and supplying a normal-temperature pressurized dry gas to a gas seal case.
CONSTITUTION: Normal-temperature pressurized dry air is always supplied to a gas seal case 3 through a seal hose 73 and is filled up there. A cooling chamber 2 is cooled preparatorily to a prescribed temperature. The sample of microscopic examination is placed on a slide glass in the cooling chamber 2, and a cover glass is placed on the sample. The cooling chamber 2 is closed with a cover. The temperature of the atmosphere in the cooling chamber 2 is transmitted to a controller 6 by temperature sensors 61 and 62. A control box 7 which receives a command opens solenoid valves 710 and 720 for a prescribed time to send a liquefied nitrogen in a cooling medium vessel 4 into the cooling chamber 2 through heat insulating hoses 71 and 72.
TAKENAKA IKU
HONDA KOUJI
| JPS423499Y1 | 1967-03-01 |