Registration-enhancing means and method for color cathode ray tu

Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield

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Details

313408, 445 37, 445 45, H01J 2982, H01J 2907

Patent

active

046722602

ABSTRACT:
A glass faceplate for use in a color cathode ray tube has a target area with a pattern of phosphor deposits circumscribed by a sealing area, and a frame supporting a shadow mask with a sealing area geometrically matching the sealing area of the faceplate. Three indexing means are spaced apart along the sealing areas for indexing the faceplate in relation to the frame, providing a gap of predetermined width, and leaving at least one corner of the faceplate unsupported. Shims means having shimming dimension equivalent to or slightly less than the predetermined gap width is located in the gap at the unsupported corner, whereby the unsupported corner is supported by the shim means such that the predetermined gap width is maintained during tube fabrication even at the unsupported corner. A method for assembling a color cathode ray tube which utilizes the shimming means according to the invention is also disclosed.

REFERENCES:
patent: 3858284 (1975-01-01), Costa et al.
patent: 3879629 (1975-04-01), Durant
patent: 4547696 (1985-10-01), Strauss

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