Indicator light assembly for control panel

Details Indicator light assembly for control panel Indicator light assembly for control panel

1984-03-14

1988-07-19

Luebke, Renee S.

Electricity: circuit makers and breakers

Electric switch details

Indicators

200311, H01H 918

Patent

active

047587016

ABSTRACT:
An indicator light assembly forms part of a push button switch. A base member is formed from a transparent material having a high index of refraction. A shaft is formed on the back of the base member which cooperates with other switch elements and which defines a space in which an indicator lamp is mounted. A concave lens is formed on the back of the base member at the forward end of this space, and a Fresnel lens is formed on the front surface of the base member. A Fresnel plate is positioned over the front of the base member and the optical surfaces thus formed serve to uniformly disperse the light from the indicator lamp.

REFERENCES:
patent: 1955599 (1934-04-01), Lamblin-Parent
patent: 2334479 (1943-11-01), Creager
patent: 3334958 (1967-08-01), Appeldorn
patent: 3740501 (1973-06-01), Kiessling et al.
patent: 3770925 (1973-11-01), Nelson et al.
patent: 4071726 (1978-01-01), Werda
patent: 4146306 (1979-03-01), Wallach
patent: 4254317 (1981-03-01), Schlegel
patent: 4404445 (1983-09-01), Baran et al.
Dennis Vanderwerf, Approximating the Fresnel Lens, Feb. 1982, pp. 57-51.

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