Integrally formed linear light strip with light emitting diodes

• US 6,673,292 B1
• Filed: 07/26/1999
• Issued: 01/06/2004
• Est. Priority Date: 08/28/1995
• Status: Expired due to Fees

• Current Assignee: Stantech Incorporated (Cooper-Standard Holdings Incorporated)
• Original Assignee: Cooper Technologies
• Inventors: Mental, Richard, Gustafson, Thomas L.
• Primary Examiner(s): Vargot, Mathieu D.
• Application Number:
  US09/360,573
• Time in Patent Office: 1,625 Days
• Field of Search: 362/800, 264/171.11, 264/272.15, 264/272.17, 264/1.29, 264/1-6, 264/1.24, 264/1.7, 264/272.16, 264/148, 264/149
• US Class Current: 264/149
• 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. A process for manufacturing an integrally formed single piece light strip, comprising the steps of:

continuously feeding bus elements to an extruder;

continuously feeding circuitry having at least one LED operatively mounted thereon to said extruder; and

extruding a plastic at a temperature below that which would damage said circuitry to encapsulate said bus elements, said circuitry and said LED.

2. The process of claim 1, further comprising the step of operatively connecting said circuitry to said bus elements during said step of extruding said plastic.

3. The process of claim 1, further comprising the step of continuously feeding a semitransparent layer of material containing indicia thereon to said extruder to encapsulate said layer of semitransparent material near a top surface of said light strip.

4. The process of claim 1, further comprising the step of passing said encapsulated bus elements and said circuitry between shaping rollers to shape said light strip.

5. The process of claim 1, further comprising the step of cooling said formed light strip in a cooling tank.

6. The process of claim 5, further comprising the step of cutting said cooled light strip into discrete segments.

7. The process of claim 6, further comprising the step of attaching electrical connectors to first and second ends of said light strip for electrical connection of said bus elements to a power source or to electrical connectors of a second like light strip.

8. The process of claim 1, wherein said step of extruding a plastic at a temperature below that which would damage said circuitry comprises extruding a plastic at about 350°

F.

9. A method for manufacturing a single piece light strip, comprising the steps of:

supplying circuitry having at least one LED associated therewith, said LED being illuminated when said circuitry is selectively energized; and

encapsulating said circuitry and said LED within an extruded thermoplastic material to form an elongated integral single piece light strip having no internal voids.

10. The method of claim 9, further comprising the steps of:

supplying bus elements;

encapsulating said bus elements together with said circuitry and said LED; and

causing said bus elements to operatively contact said circuitry during said step of encapsulating said bus elements, said circuitry and said LED within said extruded thermoplastic material.