Pillsbury Winthrop LLP
Color cathode ray tube for reducing landing drift of electron beams on phosphor layers
A main body 34 of a shadow mask is opposed to a phosphor screen and is formed in a substantially rectangular shape. The main body 34 has a main surface portion 31 where a number of electron beam apertures are formed, and a skirt portion 33 provided around the main surface portion with a non-aperture portion 32 interposed between the skirt portion and the main surface portion. A plurality of rectangular openings 38a extending in the long axis direction (or X-direction) of the mask body are formed at the skirt portion. Concave portions 47 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.
Kabushiki Kaisha Toshiba
H H
H01J H01J
additional inventional
Takashi Ichiro Masatsugu Munechika
Murai Saotome Inoue Tani