Deflection system with a controlled beam spot

Details Deflection system with a controlled beam spot Deflection system with a controlled beam spot

H - Electricity

04

N

H04N 3/26 (2006.01) H01J 29/56 (2006.01) H01J 29/76 (2006.01) H04N 9/285 (2006.01)

Patent

CA 2086238

A deflection apparatus comprising a cathode ray tube produces a field gradient that reduces a tendency of a major axis of a beam spot to become elongated at each corner, at each end of a horizontal axis and at each end of a vertical axis of a display screen (22) relative to the beam spot at the center of the display screen. A beam spot stigmator (24) causes the beam spot to be substantially anastigmatic at each of the corners, the end of the horizontal axis and the end of the vertical axis of the display screen. In an embodiment of the invention, means (11) are provided for producing a first non-uniform field providing a lensing action containing a time varying field portion not produced by the deflection coils (10, 99), said means (11) comprising a quadrupole doublet.

Appareil à déflexion comprenant un tube cathodique et produisant un gradient de champ réduisant la tendance d'un axe principal d'un point de balayage à s'allonger à chaque coin,à chaque extrémité d'axe horizontal et à chaque extrémité d'axe coaxial d'un écran de visualisation (22) comparativement au point de balayage situé au centre de l'écran de visualisation. Un stigmateur de point de balayage (24) permet de rendre le point de balayage sensiblement anastigmatique à chaque coin, à l'extrémité de l'axe horizontal et l'extrémité de l'axe vertical de l'écran de visualisation. Selon un mode de réalisation de l'invention, des moyens (11) sont prévus pour produire un premier champ non uniforme agissant comme une lentille et comprenant une partie variable dans le temps non produite par les bobines de déflexion (10, 99), lesdits moyens (11) comprenant un doublet quadripolaire.

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