Coded marking on an interior surfaces of a CRT faceplate panel a

Details Coded marking on an interior surfaces of a CRT faceplate panel a Coded marking on an interior surfaces of a CRT faceplate panel a

1996-03-18

1998-04-28

Angebranndt, Martin

Radiation imagery chemistry: process, composition, or product th

Producing cathode-ray tube or element thereof

With light-absorbing matrix on faceplate

430 26, 427 68, 427 66, 396546, 396542, G03B 4100, G03C 500

Patent

active

057442703

ABSTRACT:
The novel method for producing a coded marking on a CRT faceplate panel having an exterior 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; 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.

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Technochemical Processes of Electrovacuum Manufacture, pp. 278-281 with translation.
Translation of JP 62-128419.
Translation of JP 2-061934.

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