| 摘要 |
PURPOSE:To prevent damage due to an abnormal leak of filler gas during recording and reproduction by providing a pressure sensor and a temperature sensor in an airtight container which contains a magnetic disk and a magnetic head airtightly together with inert and comparing their output voltage with each other, and outputting a gas leak signal when the output of the pressure sensor drops below the output of the temperature sensor. CONSTITUTION:The outputs of the pressure sensor 21 and temperature sensors 22 in the airtight container 6 which contains the magnetic disk 3, magnetic head 5, etc., together with gaseous He are amplified and calibrated by operational amplifiers 24 and 25, whose output voltages are compared by a comparator 28 with each other; when the output of the pressure sensor 21 drops below the output of the temperature sensor 22, the abnormality signal A is outputted. Thus, the damage due to an abnormal leak of the filler gas is prevented during recording and reproduction.
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