Patent ID: 6630791
Filing Date: 2003-10-07
Classification: H01J

Abstract:
A cathode ray tube comprising:a cathode ray tube that has a front panel with an effective display region contained within the front panel; an electron gun that is set inside a neck of the funnel projects electron beams onto an inner surface of the front panel; a deflection yoke that is set on the funnel at the neck and deflects the electron beams projected by the electron gun; and a cancel coil that has at least one closed-loop coil, makes an interlinkage with a magnetic field leakage that escapes from the deflection yoke, and generates a magnetic field in a direction so as to cancel the magnetic field leakage, said closed-loop coil is a one-turn coil that lies in a substantially flat surface and is electrically grounded, wherein said closed-loop coil is set at either a first position or a second position, the first position having a part of the closed-loop coil running across the front panel and along a top edge of the effective display region of the front panel, and the second position having a part of the closed-loop coil running across the front panel and along a bottom edge of the effective display region.