Kabushiki Kaisha Toshiba

Kouichi Soneda

Masahiro Yokota

Yuuichi Sano

Shuuji Makimoto

Nobuyuki Tai

Shinji Ohama

Cathode-ray tube device comprising a deflection yoke with a non-circular core having specified dimensional relationships

A shadow mask opposed to a phosphor screen of a panel has a rectangular mask body and a rectangular mask frame fixed to the periphery of the mask body. The mask body has a pair of long side edges and a pair of short side edges, and the long side edges are respectively welded to long side walls of the mask frame while the short side edges are respectively welded to short side walls of the mask frame. The long and short side walls of the mask frame are respectively supported on the panel by mask holders. Each mask holder has a fixed portion welded to the mask frame and an engaging portion engaged with a stud pin of the panel. Welding positions between the long side edges of the mask body and the long side walls of the mask frame are shifted from the short axis, and welding positions between the short side edges of the mask body and the short side walls of the mask frame are shifted from the long axis.

Color cathode ray tube

An exposure apparatus for exposing a resist film coated on the inner surface of a face panel in a color cathode-ray tube through a shadow mask with a number of apertures apparatus comprises an exposure light source having an optical axis coaxial with an axis of the face panel, for radiating a light beam onto the inner surface of the face panel through the shadow mask. A discontinuous lens is arranged between the exposure light source and the shadow mask to be rotatable about the optical axis. The discontinuous lens has first and second regions arranged adjacent to one another in the direction of rotation of the discontinuous lens. A light beam from the exposure light source is guided by means of the first and second regions to the shadow mask along different paths. The lens is rotated by a drive motor so that the light beam from the light source passes through each of the apertures along two different paths.

Method of forming phosphor screen of color cathode-ray tube and exposure

Growing community of inventors

Kumagaya, Japan

Kouichi Soneda