Electric lamp and discharge devices – Cathode ray tube – Beam deflecting means
Patent
1986-03-10
1988-06-21
Moore, David K.
Electric lamp and discharge devices
Cathode ray tube
Beam deflecting means
313432, 313449, 313460, 313103CM, H01J 146, H01J 336, H01J 2980
Patent
active
047527145
ABSTRACT:
An electrostatic decelerating and scan expansion lens system (10) includes a mesh element (56) and operates in a cathode-ray tube (12) that incorporates a microchannel plate (24). The lens system is positioned downstream of the deflection structure (42 and 44) and provides linear magnification of the electron beam deflection angle. The mesh element is formed in the shape of a convex surface as viewed in the direction of travel of the electron beam (40) to provide a field with equipotential surfaces (100) of decreasing potential in the direction of electron beam travel. Secondary emission electrons generated by the mesh element as it intercepts the electron beam, are therefore, directed back toward the lens system and not toward the microchannel plate. Only the beam electrons strike the microchannel plate, which provides on the phosphorescent display (20) an image of high brightness, free from spurious light patterns.
REFERENCES:
patent: 3376447 (1968-04-01), Petit
patent: 4511822 (1985-04-01), Washington et al.
patent: 4543508 (1985-09-01), Saito
Hawken Kenneth W.
Sonneborn John H.
Angello Paul S.
Moore David K.
Tektronix Inc.
Wieder K.
Winkelman John D.
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