| 摘要 |
A cathode-ray tube is arranged in such a way that a fluorescent screen is formed on a tubular panel, and is scanned by a single electron beam emitted from an electron gun; and a luminescent picture image formed on the screen is viewed from the side on which the electron beam is incident. This beam-indexing color cathode-ray tube has a fluorescent screen (8) which is constituted by a plurality of fluorescent stripes (R), (G), (B), and first and second indexing electrode stripes (ID1), (ID2). The fluorescent stripes (R), (G), (B) are formed by deposition on a panel (4) in such a manner that the stripes are arranged alternately in a direction orthogonal to the scanning direction of a single electron beam (EB), so that each extends in the scanning direction. The first and second indexing electrode stripes (ID1), (ID2) have light-absorbing properties and are formed by deposition on the panel (4) in such a manner that the electrode strips are arranged alternately between adjacent of the fluorescent stripes (R), (G), (B). The color cathode-ray tube is further provided with auxiliary vertical deflection means (24), (25). The fluorescent stripes (R), (G), (B) and the first and second indexing electrode stripes (ID1), (ID2) disposed on either side of each of the stripes (R), (G), (B) are simultaneously scanned by the single electron beam EB. A signal representing the difference between first and second electron beam arrival position detection signals is supplied to the auxiliary vertical deflection means (24), (25) as a correction signal for the vertical deflection, so that the scanning tracking of the single electron beam EB in relation to the fluorescent stripes (R), (G), (B) can be controlled by the auxiliary vertical deflection means (24), 25). Thus it is possible to obtain a beam-in-dexing color cathode-ray tube which is free from undesirable color smearing, which has a simplified construction, a low separation frequency during color separation modulation of the electron beam (single electron beam) by each of the primary color signals, a high degree of accuracy in detecting the electron beam arrival position, a large detection signal quantity, and which also enables the easy positioning of the indexing electrode stripes and the fluorescent stripes for each of the colors with respect to each other. |
