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AssigneesHitachi, Ltd., Hitachi Device Engineering Co., Ltd.
InventorsMasahiro Nishizawa, Hiroshi Yoshioka, Yoshiyuki Odaka, Toshio Tojo
Estimating the term…
A color cathode ray tube of the present invention includes an evacuated envelop that is structured from a panel having a phosphor screen on its inner surface, a neck portion containing therein an electron gun assembly, and a cone-shaped section called the funnel for integrally coupling the panel and the neck together, wherein when the main scanning direction of a display screen formed of the panel is defined as an X direction whereas a direction at right angles to the main scan direction is as a Y-direction, an equivalent radius of curvature Rxo of an outer surface of the panel in the X direction is at least 2.6 times greater than an equivalent curvature radius Rxi of the inner surface while forming on the inner panel surface an inside light absorption layer that is comprised of pigments as its principal component.
A color cathode ray tube comprising an evacuated envelop including a panel portion, a neck portion and a funnel portion for connecting said panel portion and said neck portion, a phosphor screen formed on an inner surface of said panel portion, and an electron gun housed in said neck portion, characterized in that while letting a main scanning direction of a display screen formed of said panel be given as an X direction and a direction at right angles to the main scan direction be given by a Y direction, an equivalent radius of curvature of an outer surface of said panel at least in the X direction is greater by 2.6 times or above than an equivalent radius of curvature of the inner panel surface, that said panel has on its inner surface an inside light absorption layer and also has on the outer surface of said panel an outside light absorption layer including a reflection prevention film and an antistatic film, and that light absorption of said outside light absorption layer is greater at central part of said panel while being less at a peripheral portion.
Dependencies are inferred from the claim text.