Kabushiki Kaisha Toshiba

Ichiro Saotome

Takashi Murai

Masatsugu Inoue

Munechika Tani

Norio Shimizu

Kumio Fukuda

Shinji Ohama

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

Color cathode ray tube having shadow mask with prescribed bridge widths

A color-cathode ray tube having a shadow mask with improved aperture arrays. The aperture arrays are spaced at appropriate intervals and are curved to suppress local doming of the effective part of the shadow mask and to prevent electron-beam mislanding from occurring on a phosphor screen. The distance between any two adjacent apertures is expressed as: PH(N)=A+BN.sup.2 +CN.sup.4, where PH(N) is the distance between the (N-1)th and Nth arrays and A, B, and C are fourth-degree functions of a Y-coordinate. The apertures along a long side of the effective part of the shadow mask in a section extending for one-fourth of a width of the effective part of the shadow mask from a short side of the effective part of the shadow mask are inclined in an opposite direction to the apertures within the section and located one-third of a height of the effective part of the shadow mask from the long side.

Color cathode-ray tube having a shadow mask with improved arrays of

Growing community of inventors

Urawa, Japan

Ichiro Saotome