Electric lamp or space discharge component or device manufacturi – Process – With assembly or disassembly
Patent
1985-04-22
1986-05-27
Ramsey, Kenneth J.
Electric lamp or space discharge component or device manufacturi
Process
With assembly or disassembly
445 45, 445 52, H01J 930
Patent
active
045913447
ABSTRACT:
A method of making a color cathode ray tube is disclosed that utilizes a tensed color selection electrode assembly as a stencil for screening a pattern of luminescent phosphor deposits upon a faceplate. The faceplate has a target area and a peripheral sealing area and a plurality of registration-affording means at selected locations about its periphery. The faceplate is utilizable as a constituent of a color cathode ray tube. Electrode assembly comprises frame means to which is bonded a planar tensed foil. Means are provided for bonding the faceplate and the frame means such that the frame becomes an integral part of the vacuum envelope for the tube during final assembly of the tube. Indexing means mechanically associated with the frame and cooperable with the faceplate registration-affording means to facilitate multiple registered matings of the frame and the faceplate during the screening. The method according to the invention comprises applying a photosensitive coating to the target area; registering the frame with a faceplate to enable the foil to serve as a screen stencil; causing the coating to be exposed to radiation actinic thereto such that the latent image of the pattern formed in the photosensitive coating corresponds to the patterns of electron beam landings on the target area when the tube is finally assembled and operating; removing the frame means and processing the exposed coating. The method steps are repeated for each method of elemental phosphor deposits desired to be established. The faceplate screening area is then sealed to the frame sealing area with a registration-affording means and indexing means in mating registration, whereby the frame becomes an integral constituent of the cathode ray tube envelope.
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Clarke, Jr. Ralph E.
Ramsey Kenneth J.
Zenith Electronics Corporation
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