Beam-indexing color picture tube

Details Beam-indexing color picture tube Beam-indexing color picture tube

H - Electricity

01

J

313/35.152

H01J 29/18 (2006.01) H01J 29/34 (2006.01) H01J 31/20 (2006.01)

Patent

CA 1174721

-23- ABSTRACT OF THE DISCLOSURE A beam-indexing color picture tube includes a gun for producing an electron beam that scans across a screen of the tube and a plurality of index phosphor stripes provided on the screen for emitting near-ultraviolet index lights. The near-ultraviolet index lights are transmitted through a window formed in the tube to a detector. The detector is formed by a planar fluorescent collector doped with fluorescent material for absorbing the near-ultraviolet index lights, and at the same time, generating secondary index lights having different wavelength than that of the near-ultraviolet index lights. A silicon p-i-n photodiode is mounted on the planar fluorescent collector for detecting the secondary index lights and fox generating electrical signal representing the near-ultraviolet index lights.

387225

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