| 摘要 |
The invention comprises a cathode ray tube of the index type having tracking structures (15,17) that comprise finger elements (15A, 17A). A width wP of the finger element at the position P is dependent upon the position of P on the screen (10). This enables to compensate for a position dependent compromise between various parameters of the electron beams (7,8,9), thereby improving brightness and color purity of the tube. In a preferred embodiment the width wB near the border of the screen (10) is larger than the width wC near the center of the screen.
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