Phosphorescent display system

Details Phosphorescent display system Phosphorescent display system

1976-01-08

1977-04-05

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

40130L, 40134, 250365, 250461R, 250462, 315159, H05B 3702

Patent

active

040164500

ABSTRACT:
A sign having phosphorescent indicia, a light source providing ultraviolet radiation for illuminating the sign and charging the phosphorescent indicia, and a photoelectric sensor responsive to the level of the phosphorescent glow of the indicia for briefly energizing or flashing the light source whereby to effectively recharge the phosphor when the light level of the glow decays below a predetermined value.

REFERENCES:
patent: 2486859 (1949-11-01), Meijer
patent: 3038271 (1962-06-01), MacHutchin et al.

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