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Publication numberUS2684450 A
Publication typeGrant
Publication dateJul 20, 1954
Filing dateJul 20, 1949
Priority dateJul 20, 1949
Publication numberUS 2684450 A, US 2684450A, US-A-2684450, US2684450 A, US2684450A
InventorsLowry Erwin F, Mager Eric L
Original AssigneeSylvania Electric Prod
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electroluminescent lamp
US 2684450 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

A LLT July 20, 1954 E. L. MAGER ET AL 2,684,450

ELECTROLUMINESCENT LAMP Filed July 20, 1949 [Rvw/v Elem RY [Rm .4. MAGER INVENTORS BY W ATTORNEY Patented July 20, 1954 UNITED STATES T OFFICE ELECTROLUMINESCENT LAMP Massachusetts Application July 20, 1949, Serial No. 105,794

6 Claims.

This invention relates to electroluminescent lamps and particularly to such lamps having a luminescing material in an electric field, for example between the plates of a condenser.

An object of the invention is the production of light by excitation of a luminescent material by an electric field.

An advantage of the invention is the production of light from the luminescent material directly by the field, without the intermediary of a gaseous discharge of the nature used in ordinary fluorescent lamps, and Without requiring a transparent electrode to transmit the light produced by the action of th held on the phosphor.

A feature of the invention in its broader aspects is a spaced pair of parallel conductors with a luminescent material therebetween, either directly between the conductors or with a layer of dielectric material between it and one or more of the conductors.

Other objects, advantages, and features of the invention will be apparent from the following description, taken with the accompanying drawings in which:

Fig. 1 is a perspective view of one embodiment of the invention;

Fig. 2 is a longitudinal section, to a larger scale, through the same device;

Fig. 3 is a view of another embodiment of the invention; and

Fig. 4 is a longitudinal section on line 33 in the preceding figure.

In Figs. 1 and 2, an insulating tube l, for example, a hollow tube of glass, has wound thereon a pair of wires 2, {i spaced a short distance from each other, the wires being close together and side by side, that is parallel to each other. An enamel or other insulating coating 3, i"; may be present on each wire, although this may be omitted if other pro-vision is made to prevent flashover between wires. A phosphor coating 6 is placed over and between the wires.

The phosphor may be any material which emits light on excitation by an electric field, for example, a fired mixture of 75% Zinc sulphide and 25% zinc oxide, activated by small amounts of halogens, copper and/or lead. Such a phosphor is shown in the co-pending application Serial No. 105,803 of Elmer C. Payne, filed on July 20, 1949, and other phosphors shown in that application may also be used. If desired, the wires may be wound in a flat spiral instead of a helix, and then placed on a fiat sheet of glass, or otherwise arranged in a manner to hold its spacing.

In the foregoing I have, of course, used the word wires a generic term to include not only wires of round, but also of square or other crosssection, such as thin strips.

In Fig. 4, two intermeshed metallic grids l, 8 may be printed on an insulating plate Q, for example of glass, or may be deposited by sputtering, electrodeposition or the like, or in any convenient manner. A thin coating of insulating material It may be placed over the metal, and the phosphor layer I i coated on top of that.

When a sufficient difference of potential is placed between the wires 2, 3 or the grids i, 8 the phosphor 6, II will emit light. The light will be emitted only when the potential is varied, so we prefer alternating current for excitation of our device. With direct current, light is emitted only when the voltage is applied and removed.

The spacing between the wires 2, 3 or grids l, 3 is exaggerated in the figures for greater clarity, and should generally be quite small, and with round wires, as in Fig. 2, coated with insulation 4, 5 the insulating layer may be permitted to touch in some cases.

What we claim is:

1. A luminescent lamp consisting essentially of two metal conductors, each very long in comparison with its thickness and width, side by side and close together but spaced apart, and an electroluminescent phosphor therebetween.

2. A luminescent lamp consisting essentially of two closely-spaced parallel Wires and an electroluminescent phosphor therebetween.

3. A luminescent lamp consisting essentially of an insulating plate, two intermeshed but spaced grids fixed thereon, and an electroluminescent phosphor coating therebetween and thereover.

4. An electroluminescent lamp consisting essentially of two opposed metallic sets of teeth, the teeth of one set interineshed with but spaced from the teeth or" the other set, and an electroluminescent phosphor in the spaces between the teeth.

5. The lamp of claim 4, in which the teeth are printed onto an insulating plate.

6. The combination of claim 2, in which there is a coating of insulation around the wires.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,565,565 Harrington Dec. 15, 1925 1,651,398 Lorenz Dec. 6, 1927 2,438,356 Alexander Mar. 23, 1948 2,459,633 Farris Jan. 18, 1949 OTHER REFERENCES G. Destriau: The New Phenomenon of Electrophotoluminescence and Its Possibilities for the Investigation of Crystal Lattice, Philosophical Magazine, October 1947, vol. 38, pp. 0, 701, 702, 71,1, 712, 713 and 7.2.3.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1565565 *Feb 2, 1922Dec 15, 1925Westinghouse Lamp CoElectric gas lamp
US1651398 *Mar 26, 1923Dec 6, 1927Westinghouse Lamp CoArc incandescent lamp
US2438356 *Jul 15, 1944Mar 23, 1948Albert LavenburgGaseous discharge device
US2459633 *Jul 14, 1947Jan 18, 1949Farris Clarence EFluorescent lamp
Referenced by
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US2765419 *Nov 3, 1951Oct 2, 1956Gen ElectricElectroluminescent cell
US2834903 *Oct 30, 1952May 13, 1958Gen ElectricElectroluminescent lighting device
US2841730 *Dec 5, 1955Jul 1, 1958Gen ElectricSingle crystal electroluminescence
US2851634 *Aug 3, 1953Sep 9, 1958Rca CorpFlying spot generator
US2866118 *Aug 19, 1957Dec 23, 1958Sylvania Electric ProdElectroluminescent lamp
US2886777 *Apr 27, 1955May 12, 1959Hyman HurvitzAmplitude displays
US2918594 *Aug 1, 1958Dec 22, 1959Gen ElectricVariable color electroluminescent lamp
US2928015 *Mar 26, 1959Mar 8, 1960Sylvania Electric ProdElectroluminescent lamp
US2928974 *Jun 28, 1955Mar 15, 1960Thorn Electrical Ind LtdElectro-luminescent device
US2972076 *Jan 7, 1957Feb 14, 1961Philips CorpSolid-state image intensifier
US2972703 *Jul 30, 1957Feb 21, 1961Kaiser Ind CorpElectronic control system
US2980817 *Jun 14, 1956Apr 18, 1961Libbey Owens Ford Glass CoElectroluminescent structure
US3050654 *Nov 6, 1957Aug 21, 1962Moore & HallImprovements in light source control and modulation
US3136912 *Jul 18, 1960Jun 9, 1964Gen Precision IncMethod for obtaining a conductor panel
US3283194 *Nov 16, 1955Nov 1, 1966Sylvania Electric ProdElectroluminescent lamp with a barium titanate layer
US3289025 *Jul 23, 1963Nov 29, 1966Bendix CorpContact arrangement for an electroluminescent indicator device
US3571647 *Mar 19, 1969Mar 23, 1971Astronics Luminescent IncFlexible electroluminescent structures
US4266223 *Dec 8, 1978May 5, 1981W. H. Brady Co.Thin panel display
US5485355 *Dec 6, 1993Jan 16, 1996Elam-Electroluminescent Industries Ltd.Electroluminescent light sources
US5917288 *Jun 11, 1997Jun 29, 1999Feldman; HaroldSound responsive electroluminescent visual display
US5951140 *Jun 11, 1997Sep 14, 1999Live Wire Enterprises, Inc.Display with flexible electroluminescent connector
US5959402 *Jul 30, 1997Sep 28, 1999Ruben PolyanFlexible electroluminescent light source
US6747415Dec 20, 2002Jun 8, 2004Fer Fahrzeugelektrik GmbhElectroluminescent light arrangement
WO1999016290A1 *Aug 11, 1997Apr 1, 1999Trotter InternationalElectroluminescent light source and method of making same
U.S. Classification313/494, 313/358
International ClassificationH05B33/26
Cooperative ClassificationH05B33/26
European ClassificationH05B33/26