Kabushiki Kaisha Toshiba

Munechika Tani

Takashi Murai

Masatsugu Inoue

Ichiro Saotome

Naoyuki Makino

A mask frame comprises a sidewall portion in the form of a rectangular frame including a pair of long sidewalls opposed to each other, a pair of short sidewalls opposed to each other, and corner sidewalls between the long and short sidewalls, and a base portion extending from the sidewall portion toward the center of the rectangular frame. The base portion has beads located near the corner sidewalls and connecting the long and short sidewalls.

Color cathode ray tube with mask frame having beads for rigidity

A main body of a shadow mask is opposed to a phosphor screen and is formed in a substantially rectangular shape. The main body has a main surface portion where a number of electron beam apertures are formed, and a skirt portion provided around the main surface portion with a non-aperture portion interposed between the skirt portion and the main surface portion. A plurality of rectangular openings extending in the long axis direction (or X-direction) of the mask body are formed at the skirt portion. Concave portions extending in the long axis direction (X-direction) of the mask body are formed at the non-aperture portion. The openings and concave portions are provided within a range of about &frac14; of the length W of the mask body in the long axis direction, with respect to a center of the range defined at a position distant from the short axis Y by about &frac13; of the length W of the long axis direction of the mask body.

Color cathode ray tube for reducing landing drift of electron beams on phosphor layers

A substantially rectangular shadow mask is arranged opposite to a phosphor screen formed on an inner surface of a panel. The shadow mask has a mask body and a mask frame to which a peripheral portion of the mask body is attached. The shadow mask has a rectangular form having a center through which a tube axis passes, and a long axis and a short axis passing through the center and perpendicular to each other. The mask frame has a pair of long side walls extending parallel to the long axis and a pair of short side walls extending parallel to the short axis. The height of each long side wall at a central portion along the tube axis is lower than the height of each short side wall at a central portion along the tube axis.

Growing community of inventors

Konosu, Japan

Munechika Tani