H - Electricity – 01 – J
Patent
H - Electricity
01
J
316/3
H01J 9/42 (2006.01) G01R 31/24 (2006.01) H04N 17/04 (2006.01)
Patent
CA 1161489
l PHN. 9441. ABSTRACT A device for and methods of measuring and adjusting the convergence of the electron beams in a colour display tube of the shadow mask type. The device includes a detector in the form of a divided photosensi- tive cell comprising at least two separate photosensitive surface parts which are situated symmetrically relative to the centre of the cell. The photosensitivity of the sur- face parts increases substantially from the centre of the cell. In use the device is mounted so that the detector is on the central area of the display screen. Three lines are produced in one deflection direction of the tube by means of the three electron beams with one video signal. The central line and detector are moved relative to each other until the longitudinal axis of the line coincides with the centre of the cell. Then either the distances from the axes of the other two lines to the axis of the centre line are measured by determining the differences of the incident light impinging on the two separate sur- face parts and the measurements are stored for subsequent use or the static convergence unit of the tube 18 adjusted until all three lines coincide. The method is repeated for three line extending in the other deflection direction.
350552
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
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