Multi-bulb light source

Details Multi-bulb light source Multi-bulb light source

1987-09-28

1989-04-11

Lazarus, Ira S.

Illumination

Automatic substitution of power supply or light source

362211, 362212, 362215, 362347, F21V 1904

Patent

active

048211540

ABSTRACT:
A light source for use in traffic signals has a plurality of light bulbs, in which each bulb is used in turn until it burns out, at which time power is switched to an operable bulb. By means of lenses and mirrors in the light source, a substantially identical pattern of light rays is produced regardless of which bulb is lit.

REFERENCES:
patent: 2032515 (1936-03-01), Troup
patent: 2258575 (1941-10-01), MacKay
patent: 2342085 (1944-02-01), MacKay
patent: 2551029 (1951-05-01), MacKay
patent: 2557531 (1951-06-01), Blanchet
patent: 4225901 (1980-09-01), Luce
patent: 4402038 (1983-08-01), Hartung et al.
patent: 4415951 (1983-11-01), Recane et al.

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