JPS6424584A - Convergence device - Google Patents

Abstract

PURPOSE:To detect a static color slippage with a simple circuit constitution and with good accuracy without providing a detector on a screen and to automatically execute the static convergence correction by converging the light of a pattern signal by the optical system to set a pattern signal reflected on the screen at the position away from the screen. CONSTITUTION:By lenses 32 and 33 to provide pattern signals 34 and 35 reflected on a screen 20 at a position away from the screen, the light of a pattern signal is converged, and for the light of the converged pattern signal, the dislocation is detected by detectors 30 and 31 composed of an one- dimensional photoelectric converting element, the detecting signal is supplied to a position detector 36, the dislocation quantity to a reference position is detected, and a convergence correcting circuit 38 is controlled by the detecting signal. Thus, since a display screen and a detector can be divided, detection can be executed without providing the detector on the screen, respective parts of the screen can be detected, the convergence dislocation of a central part can be detected with good accuracy and the fluctuation of the static convergence can be automatically adjusted.