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A Principles of television
MODERN CAMERA TUBES FOR TELEVISION
THEORY OF THE IMAGE ICONOSCOPE
amplifier beam current black level C.P.S.-emitron calculated cathode cathode potential cathode-ray tube chapter characteristics collector anode collector potential corresponding curve decrease deflection depth of focus effect electric electron beam electron current employed equals focused frame frequency gamma correction high-light illumination level image iconoscope increase iphtot layer lens light line-by-line restoration measured method mica modern camera tubes monitor mosaic multiplier records negative charge Nipkow disk noise number of lines number of secondary optical image oscilloscope output signal photo-cathode photo-conductive photo-current and beam photo-electrons photo-sensitive pick-up device picture element picture quality potential image potential rise reaching the collector redistribution current result scanning beam scene Schematic secondary electrons released secondary-emission coefficient sensitivity signal current signal level signal output signal plate signal resistor signal-to-noise ratio spurious signals stabilization potential successive scans target element target potential target stabilization television thermal noise total photo-current true black tubes with high-velocity uA/lm unilluminated video-signal Volts