Luminescent screen devices

Details Luminescent screen devices Luminescent screen devices

1979-05-30

1983-05-10

Blum, Theodore M.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

H01J 3150, H01J 4014

Patent

active

043831699

ABSTRACT:
The aluminium-backed phosphor layer on the output window of conventional image intensifier tubes of the photoemissive/luminescent screen type can be seriously damaged by the extremely high energy density pulse of electrons resulting from exposure of the tube to very bright light (such as a shell flash). The invention prevents or minimises the damage by placing in between and in contact with the phospher layer and the aluminium layer a layer of material (for example, potassium silicate) whose thermal properties are such as to cause it to act as a heat sink and so absorb most, if not all, of the thermal energy released by the electron pulse.

REFERENCES:
patent: 3513345 (1970-05-01), Feaster
patent: 3665247 (1972-05-01), Gordon
patent: 4002938 (1977-01-01), Pehe

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