Signal lamp with LEDs

Details Signal lamp with LEDs Signal lamp with LEDs

1997-10-14

1999-09-07

Cariaso, Alan

Illumination

Plural light sources

With modifier

362268, 362331, 362800, F21V 500

Patent

active

059475870

ABSTRACT:
The invention relates to a signal lamp comprising a box-shaped housing having an open end, a number of LEDs being provided in the housing and the open end of the housing being closed by means of a spreading window. The invention is characterized in that the LEDs are clustered around the central axis of the housing and in that the lamp comprises a positive lens (preferably a fresnel lens). The signal lamp in accordance with the invention provides an optimum, homogeneous brightness distribution on the surface of the spreading window. Preferably, the lens has a focal distance f, the LEDs are arranged at a distance v from the lens, and 0.55<v/f<0.975. This measure contributes to the intended optimum homogeneous brightness distribution.

REFERENCES:
patent: 4684919 (1987-08-01), Hihi
patent: 4965876 (1990-10-01), Foldi et al.
patent: 5006971 (1991-04-01), Jenkins
patent: 5388035 (1995-02-01), Bodem, Jr.
patent: 5567036 (1996-10-01), Theobald et al.
patent: 5580156 (1996-12-01), Suzuki et al.

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