H - Electricity – 01 – J
Patent
H - Electricity
01
J
355/56, 313/35.3
H01J 29/48 (2006.01) H01J 29/62 (2006.01)
Patent
CA 1177971
TITLE OF THE INVENTION: Cathode-Ray Tube Driving Apparatus ABSTRACT OF THE DISCLOSURE: A decelerating grid is interposed between grids which form a main lens and a pre-triode which comprises a cathode, a control grid and an accelerating grid and which forms a pre-focusing lens. A voltage application means applies to the decelerating grid such a voltage that only the outer electrons which defines the outer shell or envelope of an electron beam which has been subjected to the crossover in the vicinity of the pre-focusing lens and directed toward the main lens are subjected again to the crossover. The blooming due to the spherical aberration of the main lens can be reduced to a minimum and the desired diameter of the beam spot can be positively maintained even when a high beam current flows. - 1 -
382797
Arimoto Nozomu
Kimura Masamichi
Taniguchi Masato
Gowling Lafleur Henderson Llp
Matsushita Electric Industrial Co. Ltd.
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