H - Electricity – 01 – J
Patent
H - Electricity
01
J
H01J 29/00 (2006.01) H01J 9/00 (2006.01) H01J 29/86 (2006.01)
Patent
CA 2154813
The novel method for producing a coded marking on a CRT faceplate panel having an exterior surface and an interior surface, with a viewing area surrounded by a periphery and having a luminescent screen with a plurality of different light- emitting phosphors separated by light-absorbing material, includes the steps of: depositing a suitable photoresist on the interior surface of the panel to form a layer that extends across the viewing area and onto the periphery; illuminating areas of the photoresist on both the viewing area and the periphery with actinic radiation to selectively change the solubility of the photoresist; and developing the photoresist to remove the more soluble areas, thereby exposing underlying portions of the interior surface of the panel while leaving retained areas of less soluble photoresist. The retained areas of the photoresist and the exposed portions of the interior surface of the panel are then overcoated with a light-absorbing material which is dried to form a coating. The light-absorbing coating is developed by removing the retained areas of the photoresist having the overlying light- absorbing coating thereon, while leaving the coating of light- absorbing material adhered to the exposed portions of the interior surface of the panel. The developing step forms openings in the light-absorbing coating on the viewing area and a coded marking, including a pattern of light-absorbing material and open areas, on the periphery of the panel.
Baran Anthony Stanley
Brunner Glenn William
Diaugustine Frank Thomas
Duschl Robert Anthony
Gadbois George Simon
Craig Wilson And Company
Thomson Consumer Electronics Inc.
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