CRT faceplate panel having coded marking and method of providing same

摘要

The novel method for producing a coded marking Ä32Ü on a CRT faceplate panel Ä12Ü having an exterior surface and an interior surface, with a viewing area Ä18Ü surrounded by a periphery Ä20Ü and having a luminescent screen Ä22Ü with a plurality of different light-emitting phosphors ÄR, G, BÜ separated by light-absorbing material Ä23Ü, includes the steps of: depositing a suitable photoresist on the interior surface of the panel to form a layer Ä42Ü that extends across the viewing area Ä18Ü and onto the periphery Ä20Ü; 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 Ä32Ü, including a pattern of light-absorbing material Ä34Ü and open areas Ä36Ü, on the periphery of the panel. $$