| 摘要 |
<p>A transparent cellulose film is applied over the picture screen of a cathod ray tube in order to screen off electrostatic fields and other radiation from the picture screen. The cellulose film (21) may be supported by a transparent support film (22) which imparts suitable strength properties and optical properties to the aggregate of cellulose film and support film. The support film may consist of cellulose acetate butyrate, and could to advantage contain closely spaced microlouvers for improvement of optical properties of the screen device and the observable picture on the picture screen.</p> |
