Patent ID: 6534908
Filing Date: 2003-03-18
Classification: H01J

Abstract:
A color cathode ray tube including a vacuum envelope comprised of:a panel portion having an approximately rectangular shape, which has a long axis, a short axis, and a diagonal axis, with a phosphor film formed on an inner surface thereof; a neck portion having a circular cross section which accommodates an electron gun; and a funnel portion which is gradually enlarged toward a panel portion side thereof and gradually reduced in the opening cross section thereof toward a neck portion side and includes a deflection yoke mounting region having a pyramidal shape at a side which is connected to the neck portion; wherein an inflection point, at which a curving direction of an inner wall changes from an inner wall of the deflection yoke mounting region to a panel portion side inner wall, is formed on an inner surface of the funnel portion at a cross section of the color cathode ray tube including a tube axis and at least one of the long axis, the short axis, and the diagonal axis; and wherein an angle made by a straight line, which passes through the inflection point and is perpendicular to the tube axis, and a tangent line at the inflection point which passes through the tube axis is within 5Â°-11Â°.