Abstract: A sensor system is adapted for use in automatically adjusting the deflection system of a television picture tube so as to compensate for pincushion distortion including a rectangular frame disposed along the edge of the screen within the sweep range of the electron beam. The frame comprises a striplike, regular arrangement of alternately transparent and opaque segments. In a first embodiment, a conductive path having an external terminal and shielded from the cathode of the television picture tube at regular intervals by equally large metal areas runs along the edge of the screen. This arrangement is on the inside of the screen. In a second embodiment, an optical-fiber array with at least one light-sensitive detector mounted at at least one corner is used.

Abstract: A zener diode is disclosed which is temperature-compensated for a special application. If a zener diode is operated with a switch shunted across it, and its on-off ratio is variable, its dissipation will vary. It is proposed to form on the zener diode crystal an additional dissipative component which is switched on/off in an opposite sense to that of the zener diode. Thus, the total dissipation remains constant.