Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Patent
1978-01-30
1978-12-19
Demeo, Palmer C.
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
324 96, H05B 3302
Patent
active
041307763
ABSTRACT:
Each of a row of spaced, parallel, fired-on silver electrodes or bar segments on the face of a substrate has one end thereof disposed in spaced, confronting relation to one edge of an elongate terminal of fired-on silver, which is formed on the face of the substrate parallel to the row of segments. A plurality of wire-sized grids project from said one end of each segment into spaced, parallel, intermeshed relation with a plurality of similar grids which project from the inner edge of the terminal. These spaced sets of grids, there being one such set for each segment, are coated with a photoconductive material to form with the associated set of grids a light-sensitive switch. A first EL lamp overlies the sets of grids or switches with its light-transmitting side facing downwardly; and a second EL lamp overlies the bar segments with its light-transmitting side facing upwardly. Normally when an AC signal is applied across said terminal and the upper electrode on the second lamp, the latter is not illuminated. However, when an analogue ramp voltage, generated in response to a changing parameter such as temperature, pressure, etc., is applied across electrodes of the first lamp at one end thereof, as the amplitude of the ramp voltage increases the first lamp will be illuminated progressively from said one end thereof toward the other, and its downwardly facing illumination will progressively switch the sets of grids to conductive modes therefore causing the bar segments, as they become energized, to illuminate registering, bar-shaped portions of the second lamp.
REFERENCES:
patent: 3059144 (1962-10-01), Bowerman, Jr.
patent: 3309610 (1967-03-01), Yamamoto
patent: 3904924 (1975-09-01), Hilsum et al.
DeMeo Palmer C.
T. L. Robinson Co., Inc.
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