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AssigneeU.S. Philips Corporation
InventorsLeendert Johan van de Polder, Sing Liong Tan
Estimating the term…
A black-white or color television camera has a pick-up tube having a signal electrode comprising separate strips. Before a line scanning operation to be performed by an electron beam takes place, the signal electrode strips are coupled to a reference potential. After the line scan, the strips which are coupled separately to parallel inputs of a switching circuit which is provided with switches coupled to the parallel inputs, are coupled for supplying video information. This results in a separation between electron beam scanning and picture signal supply by the pick-up tube, which has the advantage that the beam scanning does not affect the picture quality in the direction of line scan. Furthermore, the construction with strips yield an improved signal-to-noise ratio. The switching circuit may, possibly together with a shift register, be integrated in a semiconductor body, which is provided near the signal electrode in the pick-up tube or outside the pick-tube.
A television camera comprising a a pick-up tube including an electron gun means for generating an electron beam, and a target plate including a photo-sensitive layer to be scanned by the electron beam and a signal electrode having electrically conducting strips which are separated from each other, deflection means for providing a line scanning across successive strips by said beam, a switching circuit having parallel inputs separately coupled to the strips of the signal electrode respectively, and switches coupled to the parallel inputs, and a switching signal generator means for controlling the switches and for providing that prior to a line scan of the target plate by the electron beam the signal electrode strips are coupled to a reference potential through the switching circuit and for providing that after a local line scan by the electron beam of a signal electrode strip the switch which is coupled to the associated parallel input is closed for providing information.
A television pick-up tube comprising an envelope, a target plate disposed at one end of said envelope and including a photosensitive layer and a signal electrode comprising a plurality of adjacent strips, an electron gun means disposed at an opposing end of said envelope for generating an electron beam for scanning the target plate, and an integrated circuit having a plurality of parallel inputs separately coupled to the strips of the signal electrode respectively.
Dependencies are inferred from the claim text.