Method of screeing projection tube incorporating interference filter
AssigneeNorth American Philips Corporation
InventorsJoseph E. Lane, Kenneth Speigel
Life of this patent
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Abstract
A phosphor screen for a cathode ray tube employing an interference filter for projection television is produced by temporarily sealing the face panel and funnel of the tube toegether, forming the screen by a settling technique, and then separating the screened panel and funnel to allow access to the panel for further processing prior to permanently sealing the panel and funnel together.
Claims9
A method for producing a luminescent phosphor screen on a display panel of a monochrome cathode ray tube for projection television, the method comprising temporarily sealing the display panel to a funnel to form a temporary bulb-like envelope, forming the screen on the panel by settling phosphor particles from a liquid contained in the envelope, decanting the liquid, and unsealing the screened panel from the funnel.
Dependencies are inferred from the claim text.