Radiation imagery chemistry: process – composition – or product th – Radiation modifying product or process of making – Radiation mask
Patent
1977-11-18
1981-02-03
Kimlin, Edward C.
Radiation imagery chemistry: process, composition, or product th
Radiation modifying product or process of making
Radiation mask
430 23, 430 24, 430321, G03C 500, G03C 506
Patent
active
042489474
ABSTRACT:
A method for producing a master pattern used for manufacture of a color picture tube phosphor screen is disclosed. An image of an interchangeable shadow mask is formed on the internal surface of the face glass and transferred onto a photosensitive plate, thereby producing a master pattern with a very high accuracy. In the case of a very thin photosensitive plate, the master pattern is produced directly from the interchangeable shadow mask. The method for producing a color picture tube by use of a master pattern involves equipment much lower in cost and easier in manufacturing processes than the conventional methods due to the facts that exposure by flood light is possible and that the shadow mask and the face glass need not be handled as a couple.
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Hitachi , Ltd.
Kimlin Edward C.
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