Cathode ray tube and signal detecting method in cathode ray tube
AssigneeSony Corporation
InventorsShoichi Muraguchi, Hiromu Hosokawa, Takahiro Inoue
Life of this patent
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Abstract
A capacitor for outputting a reference signal is formed by using a part of an envelope. A reference signal according to an anode voltage is output from the capacitor for outputting a reference signal. An unnecessary signal component included in an index-detection signal which is output via the capacitor for outputting an index signal is eliminated on the basis of the reference signal. With the configuration, only the required index-information signal is extracted from the index detection signal with high accuracy at a high SN ratio.
Claims7
A cathode ray tube comprising:
- an envelope;
- an anode voltage portion to which an anode voltage is supplied;
- an electron-gun for emitting an electron beam for scanning a valid picture-plane area and an overscan area outside of the valid picture-plane area;
- first signal-output means for outputting an electric detection signal according to incidence of the electron beam for scanning the overscan area;
- second signal-output means connected to the anode voltage portion, for outputting a reference signal according to the anode voltage;
- and
- signal-extracting means to which the detection signal and the reference signal are input, for eliminating an unnecessary signal component included in the detection signal on the basis of the reference signal and extracting and outputting a necessary signal component.
A signal-detecting method in a cathode ray tube comprising an envelope, an anode voltage portion to which an anode voltage is supplied, and an electron-gun for emitting an electron beam for scanning a valid picture-plane area and an overscan area outside of the valid picture-plane area, comprising the steps of.
- outputting an electric detection signal in accordance with the incidence of the electron beam for scanning the overscan area;
- outputting a reference signal according to the anode voltage supplied to the anode voltage portion;
- eliminating an unnecessary signal component included in the detection signal on the basis of the reference signal;
- and
- extracting and outputting a necessary signal component.
Dependencies are inferred from the claim text.