Document Type and Number:
Japanese Patent JPS5625828
Kind Code:
B2
Abstract:
A method and sweep signal monitoring circuit for protecting scanned electron tubes, particularly high sensitivity imaging devices such as television camera tubes, from damage upon loss of a sweep voltage. A monitoring circuit monitors the sweep voltage and generates, through the use of complementary gating signals, a digital signal having a first signal level for a normal sweep voltage and a second signal level for an abnormal sweep voltage. The second signal level of the digital signal not only indicates loss of the sweep voltage but also indicates undesirable changes in the zero crossing point of the sweep voltage. The signal level of the digital signal is monitored and the detection of the second signal level may result in the inhibiting of the scanning of the tube or in any other suitable protective measures.
Application Number:
JP12741073A
Publication Date:
June 15, 1981
Filing Date:
November 14, 1973
Export Citation:
International Classes:
H02H7/20; H04N3/20; H04N5/228
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