| 摘要 |
Improvements are set forth for generating and detecting index signals which indicate the position of a scanning beam on a target screen. Light pipe-scintillator combinations are disposed about the target screen, the funnel section and the electron gun section of beam-index and multicolor cathode ray tubes. Multiple configurations of optical fibers, hollow cylinders and funnels collect, transform, and concentrate electromagnetic radiation, index signals, and derivates thereof. Light pipe-scintillator configurations used with the target screen transmit optical signals from different regions of the target screen to its periphery. Scanning of the target screen by light beams is also described.
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