Method for making high resolution phosphorescent output screens

Details Method for making high resolution phosphorescent output screens Method for making high resolution phosphorescent output screens

1980-03-31

1981-09-15

Hoffman, James R.

Coating processes

Electrical product produced

Fluorescent or phosphorescent base coating

427 2, 427 72, H01J 2918, G21K 400

Patent

active

042897998

ABSTRACT:
A screen for converting an electron image to an optical image is made by coating a transparent substrate with 1 micron mean particle size phosphor in fluid thermoplastic material using a spinning method. When the thermoplastic is set it is heated to near melting and additional fine phosphor is driven into its surface with an ultrafine sponge. After baking, this first layer is coated with a slurry of coarser grain phosphor suspended in water and a silicate compound and the substrate is centrifuged. After this second layer is dry, a thin coat of lacquer is applied and dried followed by aluminizing the lacquer. The coated screen is then baked to drive off the lacquer volatiles.

REFERENCES:
patent: 2119309 (1938-05-01), Batchelor
patent: 2798821 (1957-07-01), Lehmann
patent: 4025662 (1977-05-01), Sumner

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