Optical interprogation system for use in constructing flat tension shadow mask CRTS

DETAILED DESCRIPTION What is claimed is: 1.
An apparatus for interrogating at least one CRT workpiece, comprising; a) a plurality of video cameras placed in known locations, the cameras each having a field of view on at least one CRT workpiece; b) means for representing each field of view as a series of pixels; c) means for valuing each pixel in a single-bit image value; d) processor means for serially comparing each camera's series of pixel image values in parallel to determine where transitions take place between pixel image values for each camera; e) means for filtering the transition locations to determine where desired features in the fields of view occur.
2.
The apparatus according to claim 1 wherein the means for representing each field of view in claim 1 (b) includes: means for synchronizing each camera's operation.
3.
The apparatus according to claim 1, further comprising: means for manipulating the workpiece in response to the determinations of the processing and filtering means.
4.
The apparatus according to claim 3 wherein the means for manipulating includes means for moving a CRT shadow mask and a CRT faceplate towards registry.
5.
The apparatus according to claim 4 wherein the means for moving towards registry further includes means for affixing the mask to a faceplate mounted mask support to form a faceplate assembly.
6.
In the manufacture of CRTs a system for registering undedicated flat tension masks to phosphorescent screens deposited on CRT front panels, comprising: (a) an assembly station where the mask and panel are joined together; (b) a mask module for supporting the mask for transport to the assembly station; (c) a panel module for supporting the panel for transport to the assembly station; (d) module registration means at the assembly station for locating serially the mask module and the panel module; (e) interrogation means for interrogating the mask and the panel to determine the locations of the desired features of the mask and panel, including: 1.
) a spaced array of video cameras, each camera located in a known position and each producing a video signal electronically representing its field of view; 2