Patent
1977-03-28
1978-09-12
Corbin, John K.
40452, 350 9618, 350213, 40547, G02B 516
Patent
active
041133471
ABSTRACT:
An arrangement for directional radiation of light in symbol-indicator systems which are to be effective over fairly large distances, with the symbols being formed by dots of a dot matrix which receive light from respective light conductor bundles, particularly for utilization as additional indicators in the railroad signalling field, in which each matrix dot is provided with a lens arrangement comprising two horizontally adjacent lenses having their plane surfaces facing the illuminating light conductors with the two lenses being cooperatively disposed to reproduce two horizontally adjacent partially superimposed light sources in the plane of observation. In the preferred embodiment, the lens structures are of plano-convex configuration, the convex surfaces of which intersect with the spacing between the respective lens axis corresponding approximately to half the lens diameter, and with each lens arrangement being integrally formed with the indicator board or individually formed and adapted to be mounted in respective recesses in a separate indicator board.
REFERENCES:
patent: 3649098 (1972-03-01), Suverison
patent: 3853395 (1974-12-01), Vevick
Corbin John K.
Levy Stewart
Siemens Aktiengesellschaft
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