Exhaust oven for cathode ray tubes

摘要

An exhaust oven for cathode ray tubes having a housing and a baffle structure arranged within the housing for forming an atmosphere circulating passage between them. There are formed, at least in heating and slow cooling zones within the housing, plural pairs of upper discharge ports through which the circulating atmosphere is supplied towards panel portions of the cathode ray tubes. There are also plural pairs of lower discharge ports through which the circulating atmosphere is supplied towards funnel portions of the cathode ray tubes. Both the upper and lower discharge ports are located on respective sides in the housing. The positioning and discharge direction of the upper and lower discharge ports reduce the temperature difference between different portions of the cathode ray tubes to less than 10 DEG C. Thus, breakage of tubes owing to heat stresses is virtually eliminated. Each of the cathode ray tubes is securely mounted on an evacuation pipe carried on an evacuation cart within the baffle structure and is applied with a heat treatment, while the circulating atmosphere is supplied towards the cathode ray tubes from the upper and lower discharge ports. The gas contained in the cathode ray tubes is evacuated simultaneously.