BAKING DEVICE FOR FILAMENT

摘要

PURPOSE:To detect the completion of baking accurately even when small amount of air is leaked into the casing, by detecting the vacuum in the casing such that the output variation of a vacuum meter when the baking current is periodically supplied to the filament is detected. CONSTITUTION:A vacuum casing 1 is connected through an exhaust tube 2 to a vacuum pump while a X-ray generating target 3 is located in the casing 1 and a a filament 4 is grounded to be fixed in the casing. The current flowing through said target 3 is detected by a detection resistor 8 and the detected signal is provided to a heating power source 7 which controls the heating current supplied to the filament 4 such that the detection signal will always coincide with the referential level. A vacuum meter 13 will produce a signal corresponding with the vacuum in the casing 1 and supply to the first and second sample & hold circuits 14. Consequently the completion of baking can be detected accurately.