Sanyo Electric Co., Ltd.

Kazuhiro Kouno

Takashi Miwa

Shunichi Kishimoto

Hajime Hayama

Katsuhiro Hinotani

Yasuo Funazo

A flat CRT having a phosphor screen inclined with respect to the center axis of an electron beam and formed by applying phosphors to the inner surface of a tube wall. The tube inner surface is defined by rotating a plurality of logarithmic spiral curves having a constant angle of incidence and present in the x-y plane of a polar coordinate system in which the deflection center of the electron beam is its origin, the center axis extends through the origin and serves as the x-axis, and the y-axis extends through the origin and intersects the x-axis at right angles therewith. The spiral curves are rotated about the y-axis each through a specified angle to obtain a group of logarithmic curves defining the tube inner surface.

Flat cathode-ray tube and method of fabricating same

A flat color CRT having a phosphor screen comprises red, green and, blue primary phosphor color stripes arranged at a spacing, and phosphor index stripes arranged in some of the spaces between the phosphor color stripes in a definite relation thereto. A black nonluminescent substance is provided between the phosphor index stripes and positioned at least in the spaces between the phosphor color stripes, and a metallic layer of sufficient thickness formed on the inner side of a tube panel and positioned in a corresponding relationship to the phosphor color stripes.

Flat color cathode-ray tube with phosphor index stripes

A flat color CRT wherein a single beam emitted from an electron gun scans the inner surface of a tube wall and which includes a phosphor screen formed on the walls inner surface. The phosphor screen comprises a nonluminescent substance and phosphor index stripes with the substance interposed between the stripes. Red, green, blue primary phosphor color stripes have a sufficient thickness and are arranged repeatedly on the nonluminescent substance at a spacing in a definite relation to the phosphor index stripes.

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Hirakata, Japan

Kazuhiro Kouno