| 摘要 |
957,026. Cathode-ray storage tubes. RAYTHEON CO. Oct. 4, 1960 [Oct. 28, 1959], No. 34053/60. Heading H1D. [Also in Division H4] In a signal storage tube consisting of writing gun 3, storage electrode 4, secondary electron collector 5 and reading gun 2 in which the reading beam passes through the storage electrode to impinge on the collector 5 which also serves at the output electrode, the potential difference between electrodes 4 and 5 may be adjusted to effect complete or partial erasure of the charge pattern on the storage electrode. It is stated that the potential difference between electrodes 4 and 5 governs the number of elastically scattered primary electrons emitted from the collector electrode 5, these electrons having sufficient energy to reach the storage electrode 4 where they neutralize the charges of the charge pattern. Electrodes 6 and 7 are accelerating electrodes for the respective writing and reading beams. The tube may be used to convert a television picture received at one scan rate, e.g. 60 c/s., into an equivalent picture at another scan rate, e.g. 59.9 c/s., which may be, for example, in synchronism with a local power frequency. The tube may also be used in a radar system having a P.P.I. cathode-ray tube display in which it is desired to display target history to any convenient extent. |
