Emergency lighting device

Details Emergency lighting device Emergency lighting device

1993-05-18

1994-08-09

Pascal, Robert J.

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Electric switch controlled by the radiant energy responsive...

315344, 362276, 307 66, H05B 3702, H05B 3904, H05B 4136

Patent

active

053369777

ABSTRACT:
An emergency lighting device includes a hollow casing, a magnetic field detecting unit, a lamp unit and a driving unit. The casing is positioned adjacent to an electric outlet. The magnetic field detecting unit is disposed inside the casing and detects the absence of a magnetic field from the electric outlet. The lamp unit is mounted operatively on the casing. The driving unit is disposed inside the casing and is connected electrically to the lamp unit and to the detecting unit. The driving unit includes a light-sensitive switch unit and is responsive to the detecting unit so as to activate the lamp unit only when the magnetic field from the electric outlet is absent and there is weak surrounding light.

REFERENCES:
patent: 4827244 (1989-05-01), Bellavia et al.
patent: 4977351 (1990-12-01), Bavaro et al.
patent: 5132596 (1992-07-01), Walters et al.

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