Traffic light

Details Traffic light Traffic light

1980-06-18

1983-05-17

Caldwell, Sr., John W.

Communications: electrical

Digital comparator systems

340 50, 340 84, 340 87, 340118, 350101, 350104, 362241, 362243, 362245, B60Q 100, G02B 512

Patent

active

043842712

ABSTRACT:
A traffic light construction which provides a signal of a high luminous intensity, a gradual brightness variation over a cover glass and a considerable suppression of phantom phenomena. The traffic light has a parabolic reflector having a depth of about its focal length and a converging lens smaller than the cover glass. The lens produces a parallel light beam, which is incident on the central portion of the cover glass which is outside the reach of the parallel beam formed by the reflector.

REFERENCES:
patent: 1219514 (1917-03-01), Whitney
patent: 1548984 (1925-08-01), Day
patent: 1918480 (1933-07-01), Moore
patent: 3253255 (1966-05-01), Nagel
patent: 3639899 (1972-02-01), Ljungkull

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