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    • 10. 发明专利
    • HEAD DRUM FOR MAGNETIC TAPE DEVICE
    • JPH10340404A
    • 1998-12-22
    • JP15317798
    • 1998-06-02
    • THOMSON BRANDT GMBH
    • KAADEN JUERGENOLDERMANN KLAUSWURSTHORN EDGAR
    • G11B5/008G11B5/02G11B5/53G11B15/14G11B15/473G11B33/12
    • PROBLEM TO BE SOLVED: To reduce interference with a head signal by providing an electric energy accumulating means on a rotary upper cylinder and supplying electric power to all electronic parts to be rotated with the upper cylinder from this accumulating means as occansion calls. SOLUTION: This head drum 1 has a fixed lower cylinder 2 and the rotary upper cylinder 3, and the rotary upper cylinder 3 is connected with the upper end 4 of a driving shaft 6 to be rotated together. The lower end 9 of the driving shaft 6 is connected to a driving motor 11, and the upper cylinder 3 is rotated during operation of a video recorder. A control circuit is connected with an intermediate coil of a transformer, an accumulating capacitor and an amplifier, so as to control charging of the accumulating capacitor, transmission of the electric power and a changeover to the amplifier. When a secondary voltage of the accumulating capacitor is gradually raised in accordance with an increase of a receiving electric charge amt., reaching a threshold voltage, the accumulating capacitor is separated from a charging current by the control circuit to suppress energy consumption of the device to a min.