| 摘要 |
<p>A convergence measuring apparatus for e.g., a color television kinescope (19) and deflection yoke (20) comprises means (23, 45, 46) for activating two of the electron beams of the kinescope to generate a convergence test pattern on the kinescope display screen. The convergence test pattern is a set of alternating color patches (11, 12, 13). The degree of overlap (15) and gap (16) between patches is indicative of the degree of beam misconvergence. A monochrome television camera (21) observes the test pattern and provides a signal to a signal processor (22) which controls the electron beam activating means to move one color patch with respect to the other color to reduce the gap (16) and overlap (15) between patches. A measurement of the amount of patch movement necessary to minimize the overlap and gap between patches is an indication of electron beam misconvergence in the vicinity of the test pattern.</p> |
