| 摘要 |
Roughly described, a CRT contains a magnetic loop bender which causes the beam to undergo a 270° (for example) bend and intersect itself before exiting the bender orthogonally with the screen. Downstream of the bender, the beam is deflected by conventional biaxial scanning means before impingement on the screen. A magnetic field stop plate can be added in a plane that passes through the beam intersection point and that lies parallel to the pole termination plane of the bender magnetic structure. An astigmatic beam shaping mechanism can also be included, as can post-deflection acceleration of the beam to provide further shortening of the tube depth as well as a focusing action that reduces the effect of beam enlargement due to mutual electron repulsion within the beam. All of the beam bending and deflection can be done by externally attached components.
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