| 摘要 |
PURPOSE:To make it sure to eliminate any shift of convergence adjustment even if purity adjusting two-pole magnets are touched by mistake by providing a lock ring for purity-adjusting two-pole magnets and lock rings for convergence adjusting four-pole magnets and convergence adjusting six-pole magnets. CONSTITUTION:A lock ring 5 is tightened after purity is adjusted by purity adjusting two-pole magnets 1a and 1b. It is different from the conventional ones such that even if the lock ring 5 is tightened, convergence adjusting four- pole magnet rings 2a and 2b and convergence adjusting six-pole magnets 3a and 3b are not tightened because there is a hooking board 8. Accordingly, the magnet rings 2a and 2b and the magnet 3a and 3b are freely adjustable. Therefore, even if the purity-adjusting two-pole magnets 1a and 1b in the vinity are touched by fingers by mistake during adjustment of convergence, the magnets 1a and 1b do not move because they are already locked, so that there is no obstacle for adjustment.
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