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1. 发明授权

US3796913A Dynamic focus waveform generators 失效
标题翻译：动态聚焦波形发生器
公开(公告)号：US3796913A
公开(公告)日：1974-03-12
申请号：US3796913D
申请日：1973-02-28
申请人： SEACO COMPUTER DISPLAY INC
发明人： HARDING R , LESLIE L , OLSEN E
IPC分类号： G01R13/22 , G06G7/28 , H03K4/04 , H04N3/26 , H01J29/56
CPC分类号： G01R13/22 , G06G7/28 , H03K4/04 , H04N3/26
摘要： Disclosed is waveform shaping network responsive to an incoming signal of varying magnitude and polarity for producing an output signal which waveform or slope is altered, the network including a differential amplifier coupled to the input terminal having a variable level constant current source coupled thereto, the respective outputs of the differential amplifier being coupled to a pair of transistors having their collector outputs coupled to the output terminal of the network, the emitter terminals of each of the transistors respectively coupled to a pair of variable resistance networks, each of the variable resistance networks having a plurality of parallel resistive paths including a fixed and variable resistor and an emitter follower transistor for selectively and sequentially coupling each of the parallel resistive paths to the emitter of the coupled transistor for varying the slope of the signals provided at the output terminal in response to the breakpoint or conduction level of each of the emitter follower transistors. The waveform shaping network is embodied in a pair of focus generators respectively coupled to horizontal and vertical position generators which produce output signals proportional to the horizontal and vertical excursion of the electron beam of a CRT system, the output signals from the focus generators thereafter being coupled through an amplifier to the focus means for effecting the dynamic focus of the electron beam as it engages in its excursions across the CRT tube face.

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