| 摘要 |
PURPOSE:To give directivity to emission of light of phosphorescent surface by providing a multi-layer optical film where silicon oxide film and tantalum oxide film are alternately formed between a face plate glass and phosphor material layer. CONSTITUTION:While a phase plate glass which is used as a substrate is heated up to about 300 deg.C, tantalum oxide and silicon dioxide are alternately vacuum deposited through heating by electron beam in the designed constant thickness and an optical interference film is formed by the six-layer coating. Thereby, an optical interference film for very stable cathode-ray tube phosphor surface providing both heat resistance characteristic and chemical resistance property can be obtained, it is also possible to give dependency on angle to distribution of luminousity of light emission of phosphor surface. As a result, a high quality cathode-ray tube for terminal and projection type cathode-ray tube can be obtained. |
