Mesh lens focus mask for a cathode-ray tube

Details Mesh lens focus mask for a cathode-ray tube Mesh lens focus mask for a cathode-ray tube

H - Electricity

01

J

313/35.15

H01J 29/07 (2006.01) H01J 29/02 (2006.01) H01J 29/81 (2006.01)

Patent

CA 1207371

Abstract of the Disclosure The inventive CRT is similar in structure to prior art CRT's except for the color-selection structure, which, as in the prior CRT's, produces a plurality of lenses for passing and focusing portions of electron beams to associated color groups of the target. In the inventive CRT, the color-selection structure comprises at least one lenticular member having therein an array of windows associated with only one color group, each window having a half-width, r, and a conductive mesh having interstitial dimensions small compared to the phosphor elements in the color groups. The lenticular member is longitudinally spaced a distance, s, from the conductive mesh so that the ratio of the longitudinal spacing, s, to the half-width, r, of the window is much less than unity (s/r << 1), whereby the lenticular member and the conductive mesh provide a strong lens action.

449982

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