Integrally formed linear light strip with light emitting diodes

• US 5,927,845 A
• Filed: 08/28/1995
• Issued: 07/27/1999
• Est. Priority Date: 08/28/1995
• Status: Expired due to Fees

• Current Assignee: Stantech Incorporated (Cooper-Standard Holdings Incorporated)
• Original Assignee: Stantech Incorporated (Cooper-Standard Holdings Incorporated)
• Inventors: Gustafson, Thomas L., Mental, Richard
• Primary Examiner(s): TSO, LAURA K
• Application Number:
  US08/520,237
• Time in Patent Office: 1,429 Days
• Field of Search: 362/235, 362/103, 362/800, 362/147, 362/152, 362/145, 362/153, 362/153.1, 362/125
• US Class Current: 362/152
• CPC Class Codes: B64D 2203/00 Aircraft or airfield lights using LEDs
• CPC Class Codes: B64F 1/002 Taxiing aids
• CPC Class Codes: B64F 1/205 arranged underground, e.g. underground runway lighting units
• CPC Class Codes: E01F 9/582 illuminated
• CPC Class Codes: E04F 2011/1048 with lighting means
• CPC Class Codes: F21S 4/28 rigid, e.g. LED bars
• CPC Class Codes: F21S 8/032 the surface being a floor or like ground surface, e.g. pavement
• CPC Class Codes: F21V 23/06 the elements being coupling devices , e.g. connectors
• CPC Class Codes: F21V 31/04 Provision of filling media
• CPC Class Codes: F21W 2111/06 for aircraft runways or the like
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G08B 7/062 indicating emergency exits
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

An integral single piece extruded LED light strip and an associated process for producing such an LED light strip. The light strip includes first and second bus elements spaced apart from one another by a predetermined distance. The light strip also includes at least one light emitting diode (LED) connected between the bus elements that is illuminated when the first bus element conducts electricity provided from a power source. An extruded plastic material completely encapsulates the first and second bus elements and the LED, thereby providing a barrier to protect the elements from damage and to make the light strip impervious to moisture. A process for manufacturing an integrally formed single piece light strip includes the steps of continuously feeding bus elements to an extruder; continuously feeding circuitry having at least one LED operatively mounted thereon to the extruder; and extruding a thermoplastic material at a temperature below that which would damage the circuitry or the LED to thereby encapsulate the bus elements, the circuitry and the LED and to operatively connect the circuitry to the bus elements.

Claims

1. An integrally formed single piece light strip, comprising:

a flexible substrate including a light strip circuit with at least one light emitting diode (LED) that is illuminated when the light strip circuit conducts electricity;

first and second bus elements spaced apart from one another by a predetermined distance and being in electrical communication with said light strip circuit; and

a semi-rigid homogeneous plastic material extruded around said first and second bus elements, said flexible substrate including a light strip circuit, and said at least one LED, completely encapsulating said flexible substrate, said first and second bus elements and said LED to form a single piece, seamless, substantially voidless protective barrier.

2. The light strip of claim 1, further comprising at least one resistor connected in series with said LED between said first and second bus elements.

3. The light strip of claim 1, further comprising a first plurality of LEDs connected between said first and second bus elements.

4. The light strip of claim 3, further comprising a substrate strip having a plurality of discrete printed circuits thereon, said LEDs being mounted on said discrete printed circuits to permit said light strip to be cut into discrete segments corresponding to said discrete printed circuits.

5. The light strip of claim 4, wherein said substrate strip comprises a polyester substrate strip.

6. The light strip of claim 4, wherein said substrate strip comprises a fiberglass substrate strip.

7. The light strip of claim 4, wherein said substrate strip comprises a polyimide substrate strip.

8. The light strip of claim 1, further comprising a third bus element operatively connected to said power source;

at least one resistor operatively connected in parallel between said third bus element and said second bus element; and

at least one LED connected in series with said at least one resistor.

9. The light strip of claim 8, further comprising a nonconductive layer located across a top portion of said first and third bus elements for insulating said at least one resistor and said at least one LED connected between said third and second bus elements from electrical contact with said first bus element and for insulating said at least one resistor and said at least one LED connected between said first and second bus elements from electrical contact with said third bus element.

10. The light strip of claim 1, further comprising a partially transparent layer of non-conductive material containing indicia thereon imbedded between a top surface of said extruded plastic material and said LED, said indicia being illuminated upon illumination of said LED.

11. The light strip of claim 1, wherein said extruded plastic material comprises an ionomer resin.

12. The light strip of claim 1, wherein said extruded plastic material comprises a high density polyethylene.

13. The light strip of claim 1, wherein said extruded plastic material comprises polychlorotrifluoroethylene.

14. The light strip of claim 1, further comprising a polyester substrate on which said LED is mounted.

15. An integrally formed light strip, comprising:

a flexible light strip circuit;

a plurality of light emitting diodes (LEDs) mounted on said flexible light strip circuit for electrical communication with a power source; and

a homogeneous thermoplastic material extruded about said light strip circuit and said plurality of LEDs that completely encapsulates said substrate and said plurality of LEDs to form a single piece seamless protective barrier.

16. The light strip of claim 15, wherein said substrate comprises a polyester material.

17. The light strip of claim 15, further comprising:

a printed circuit formed on said substrate to which said LEDs are contacted; and

bus elements encapsulated within said extruded thermoplastic material and contacting said printed circuit for electrically connecting said light emitting diode to said power source.

18. The light strip of claim 15, further comprising a second row of light emitting diodes electrically contacted to said substrate for electrical communication with said power source, said second row of light emitting diodes being completely encapsulated within said extruded thermoplastic material.

19. The light strip of claim 15, wherein said extruded thermoplastic material protects said LEDs from moisture damage and mechanical damage due to loads being directly placed on said light strip.

20. The light strip of claim 15, further comprising an elongated channeled track for housing said light strip.

21. The light strip of claim 15, further comprising an adhesive secured to a bottom surface of said extruded thermoplastic material for maintaining said light strip in a predetermined location.

22. The light strip of claim 15, further comprising a second light strip spaced apart from and electrically connected to said integrally formed light strip.

23. The light strip of claim 15, wherein said LEDs are encapsulated such that said light strip may be severed into discrete sections.

24. The light strip of claim 15, further comprising a semitransparent film encapsulated in said extruded thermoplastic material over said plurality of light emitting diodes for providing a decorative appearance when said plurality of light emitting diodes are not illuminated and for passing light when said plurality of light emitting diodes are illuminated.

25. A light strip, comprising:

a seamless single piece extruded housing;

a plurality of longitudinally extending electrical conductors encapsulated within the extruded housing that conduct electricity therethrough; and

a plurality of light emitting diode (LED) circuits, including a plurality of LEDs mounted thereon, encapsulated within the extruded housing, the extruded housing electrically connecting the plurality of conductors with the plurality of LED circuits.

26. The light strip of claim 25, further comprising a flexible substrate populated with the plurality of LED circuits;

the light strip being severable between each of the plurality of circuits to form a plurality of discrete light strips.

27. The light strip of claim 26, wherein the plurality of LED circuits is printed on the flexible substrate.

28. An integrally formed single piece light strip, comprising:

first and second bus elements spaced apart from one another by a predetermined distance and being operatively connected to a power source;

at least one light emitting diode (LED) connected between said first and second bus elements, said LED being illuminated upon said bus elements conducting electricity; and

an extruded homogeneous plastic material that completely encapsulates said first and second bus elements and said LED and that provides a protective barrier and for making said light strip impervious to moisture;

a third bus element operatively connected to said power source;

at least one resistor operatively connected in parallel between said third bus element and said second bus element;

at least one LED connected in series with said resistor; and

a non-conductive layer located across a top portion of said first and third bus elements for insulating said resistor and said LED connected between said third and second bus elements from electrical contact with said first bus element and for insulating said resistor and said LED connected between said first and second bus elements from electrical contact with said third bus element.