Method for manufacturing an electroluminescent lamp

• US 5,667,417 A
• Filed: 02/22/1995
• Issued: 09/16/1997
• Est. Priority Date: 02/22/1995
• Status: Expired due to Fees

• Current Assignee: Novatech Electro-Luminescent Incorporated
• Original Assignee: William C. Stevenson
• Inventors: Stevenson, William C.
• Primary Examiner(s): Pirlot, David
• Assistant Examiner(s): Knapp, Jeffrey T.
• Application Number:
  US08/393,084
• Time in Patent Office: 937 Days
• Field of Search: 445/24, 445/58, 427/66
• US Class Current: 445/24
• CPC Class Codes: H05B 33/10 Apparatus or processes specially adapted to the manufacture of electroluminescent light sources

Abstract

A method for manufacturing low-cost electroluminescent (EL) lamps is disclosed. The method of the present invention includes the first step of die cutting, embossing or chemically etching a metal foil to form one or more rear capacitive electrodes. Next, the capacitive electrodes are bonded to a paper core stock which is coupled to a precisely positioned indexing system. In the third step, a layer of EL phosphor ink is applied to the capacitive electrodes to precisely form the areas of illumination. In step four, a layer of conductive ITO ink is applied to cover the layer of EL phosphor ink. Next, in step five a transparent polyester film or ultraviolet activated dielectric coating is applied to the entire surface of the lamp. Finally, in step six electrical terminations are provided to the rear capacitive electrode and the layer of conductive ITO ink.

Claims

1. A method for manufacturing an electroluminescent lamp, said method comprising the steps of:

forming a capacitive electrode from an indium tin oxide plated conductive plastic film;

applying a layer of electroluminescent phosphor ink to said capacitive electrode, said electroluminescent phosphor ink for precisely defining an area of illumination;

applying a layer of conductive indium tin oxide ink to said layer of electroluminescent phosphor ink; and

applying an insulating coating to a surface of said conductive indium tin oxide ink.

15. The method of claim 1 further comprising the step of forming said capacitive electrode from a metal foil.

16. The method of claim 15 wherein said metal foil is die cut to form said capacitive electrode.

17. The method of claim 15 wherein said metal foil is chemically etched to form said capacitive electrode.

18. The method of claim 15 wherein said metal foil is embossed onto said paper core stock.

2. A method for manufacturing an electroluminescent lamp, said method comprising the steps of:

forming a capacitive electrode from a metal foil by embossing said metal foil onto an insulating paper core stock;

applying a layer of electroluminescent phosphor ink to said capacitive electrode, said electroluminescent phosphor ink for precisely defining an area of illumination;

applying a layer of conductive indium tin oxide ink to said layer of electroluminescent phosphor ink; and

applying an insulating coating to a surface of said conductive indium tin oxide ink.

3. The method of claim 2 wherein said metal foil is die cut to form said capacitive electrode.

4. The method of claim 2 wherein said metal foil is chemically etched to form said capacitive electrode.

5. A method for manufacturing an electroluminescent lamp, said method comprising the steps of:

bonding a capacitive electrode to a paper core stock;

applying a layer of electroluminescent phosphor ink to said capacitive electrode, said electroluminescent phosphor ink for precisely defining an area of illumination;

applying a layer of conductive indium tin oxide ink to said layer of electroluminescent phosphor ink;

applying an insulating coating to an entire surface of said electroluminescent lamp; and

attaching electrical terminations to said capacitive electrode and said layer of conductive indium tin oxide ink.

6. The method of claim 5 further comprising the step of forming said capacitive electrode from an indium tin oxide plated conductive plastic film.

7. The method of claim 5 wherein said indexing system further comprises a plurality of sprocket holes along one or more edges of said paper core stock.

8. The method of claim 5 wherein said step of applying said insulating coating further comprises the step of applying a transparent polyester film.

9. The method of claim 5 wherein said step of applying said insulating coating further comprises the step of applying a translucent polyester film.

10. The method of claim 5 wherein said step of applying said insulating coating further comprises the step of applying an ultraviolet activated dielectric coating.

11. The method of claim 5 wherein said step of applying a layer of electroluminescent ink further comprises the step of applying a dielectric plastic film imbued with electroluminescent phosphors.

12. The method of claim 5 further comprising the step of forming said capacitive electrode from a metal-plated conductive plastic film.

13. The method of claim 12 wherein said metal-plated conductive plastic film is die cut to form said capacitive electrode.

14. The method of claim 12 wherein said metal-plated conductive plastic film is chemically etched to form said capacitive electrode.