Patent ID: 6157124
Filing Date: 2000-12-05
Classification: H01J

Abstract:
A cathode ray tube device comprisinga glass bulb having a substantially rectangular face panel, a cone portion, and a neck portion;a phosphorous screen formed on an inside surface of the face panel;an electron gun inside the neck portion;a deflection coil provided around a peripheral surface portion of the cone portion and the neck portion;a deflection circuit for applying a deflection current to the deflection coil, whereinan effective picture area formed on the inside of said face panel is concave, andthe effective picture area has no inflection points; andwherein .delta. and .sigma. are defined as ##EQU19## D is a distance from the center of the effective picture area (origin) to a diagonal edge of the effective picture area;H is one half of a long side of the effective picture area;V is one half of a short side of the effective picture area;.alpha. is an aspect ratio V/H of the effective picture area;R.sub.d is a curvature radius of a cross-section through a diagonal axis of the effective picture area; and.theta..sub.D is a deflection half angle.