H - Electricity – 01 – J
Patent
H - Electricity
01
J
H01J 29/98 (2006.01) H04N 3/26 (2006.01)
Patent
CA 2227080
The focus coil 14 adjusts the focal point of electron beam which forms raster. The electromagnetic focus apparatus controls the ON/OFF-combinations of the respective switches 42 to 45 in synchronization with the horizontal synchronization signal S1. By this ON/OFF-controlling, the current waveform is formed, which is supplied into the focus coil 14. The microcomputer 55 adjusts the timing of the ON/OFF-controlling of the respective switches 42 to 45 in compliance with the horizontal amplitude value of the electron beam.
L'invention est une bobine de concentration 14 servant à ajuster le point de concentration d'un faisceau électronique utilisé pour créer une trame. Le dispositif de concentration électromagnétique de l'invention contrôle les combinaisons MARCHE/ARRET des commutateurs 42 à 45 en synchronisme avec le signal de synchronisation horizontale S1. Ce contrôle permet d'établir la forme d'onde du courant transmis à la bobine de concentration 14. Le micro-ordinateur 55 effectue l'ajustement temporel du contrôle des commutateurs 42 à 45 selon l'amplitude horizontale du faisceau électronique.
Matsushita Electric Industrial Co. Ltd.
Osler Hoskin & Harcourt Llp
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