Electric lamp and discharge devices – Cathode ray tube – Secondary emissive electrode
Patent
1991-07-05
1992-07-28
DeMeo, Palmer C.
Electric lamp and discharge devices
Cathode ray tube
Secondary emissive electrode
313435, 313437, 313105CM, 315 15, 315 17, H01J 2956, H01J 2962, H01J 4302
Patent
active
051343371
ABSTRACT:
A projection lens assembly (10) projects onto a display screen (38) electrons emitted from an output side (86) of an electron multiplier such as, for example, a microchannel plate (70). The projection lens assembly includes a dome-shaped mesh element (16) that is concave as viewed from the display screen. The mesh element is positioned between the microchannel plate and a filter element (20) having a beam-limiting aperture (22). The mesh element is of an aspherical shape that allows the projection lens assembly to project the electrons toward the display screen with substantially no spherical aberration, thereby forming near the beam-limiting aperture an electron beam crossover of small diameter. The beam-limiting aperture is formed with a relatively small diameter that allows the filter element to block electrons of energies outside a preselected range of energy values, thereby reducing chromatic aberration in the image formed on the display screen.
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A. A. van Gorkum and L. C. M. Beirens, "Experiments on Eliminating Spherical Aberration in Electron Guns Using Aspherical Mesh Lenses," vol. 4, No. 5, pp. 2297-2306 (Sep./Oct. 1986).
Nobuyoshi Koshida, "Effects of Electrode Structure on Output Electron Distribution of Microchannel Plates", Rev. Sci. Instrum. 57(3), pp. 354-358 (Mar. 1986).
John H. Sonneborn and Kenneth W. Hawken, "Design of a Microchannel Plate CRT for a General-Purpose Oscilloscope," SID '86 Digest, pp. 240-243 (1986).
Hughes Duncan F.
Kongslie Keith F.
Nelson Gary A.
DeMeo Palmer C.
Meininger Mark M.
Tektronix Inc.
Winkelman John D.
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