METHOD OF MANUFACTURING A CATHODE RAY TUBE, IN WHICH A DISPLAY SCREEN IS INSPECTED

摘要

The display screen (32) of a cathode ray tube is inspected. The arrangement with which the display screen is inspected comprises an adjustable mirror arrangement and an adjustable focal lens (37). By means of the arrangement, a set of sub-images is picked up, which sub-images are analyzed. The movable elements of the mirror arrangement and the focal lens (37) are not moved during the image pick-up operation so as not to disturb the measurements. The difference data between picked-up images and standard images are generated in a unit, and errors are detected with reference to these difference data. These errors are preferably ordered as to magnitude and/or importance.