Nec Corporation

Masahiro Ueda

Nobumitsu Aibara

Yoshiaki Yanai

Shinji Arai

Tadachika Hidaka

A color cathode ray tube apparatus is provided to reduce the amount of deflection power required, this apparatus having a panel part, on the inside surface of which is formed a phosphor film that emits three primary colors, a funnel part that has its expanded aperture joined to the panel part and a funnel-shaped part, a neck part in which is housed an electron gun structure, and which is joined to the reduced-diameter &phgr; a aperture of the funnel part, and a deflection yoke that is disposed between the funnel part and the neck part, the neck part being formed by a main part that houses the electron gun structure and a reduced-diameter part to which are attached the deflection yokes. The funnel part has a quadrangular pyramid shape at the end that is joined to the neck part, and this can also be used for attachment of the deflection yoke.

Color cathode ray tube having a reduced diameter part in the neck

In a shadow mask of the present invention applicable to a color CRT (Cathode Ray Tube), a part of slots located at the opposite edges of the mask each has a horizontal section so configured as to intercept or reduce the quantity of direct light contained in exposing light, while allowing reflections from, e.g., the casing of an exposing device to pass therethrough.

Growing community of inventors

Shiga, Japan

Masahiro Ueda