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Flexible LED lighting strip
| Details |
Inventors: Luk, John F.;
Assignee: Altman Stage Lighting, Co., Inc. (Yonkers, NY)
Primary Examiner: Cariaso; Alan
Assistant Examiner:
Attorney, Agent or Firm: Lackenbach Siegel LLP
A flexible lighting device, comprising an elongated flexible tube including a translucent tubular shell with opposed tube ends, a flexible helical circuit board positioned in said tube extending between said opposed tube ends, said flexible helical circuit board having an exterior surface spaced from said tubular shell. Electrical circuitry is mounted to the circuit board and is connected to an external input source and an output source of electrical power. A plurality of light emitting diodes (LEDs) is mounted to the exterior surface of the helical circuit board and is electrically connected to the electrical circuitry. The LEDs are positioned adjacent to the tubular wall. The invention includes a method of making the flexible lighting device including providing a parallelogram-shaped flat circuit board having long edges and short edges with acute angles and obtuse angles and further including a stiffening member embedded with said flat circuit board. Electrical circuitry mounted to the flat circuit board and LEDs mounted to the flat circuit board and to the electrical circuitry thereon, are all rolled and extended into a flexible cylindrical circuit board having spaced spirals and gaps that hold the LEDs, and then inserted into the flexible tubular housing. Power input and power output connectors are added to the electrical circuitry of the flexible helical circuit board, and connector end caps are secured to the opposed ends of the tubular housing. |
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DETAILED DESCRIPTION An object of the present invention is to provide a flexible LED lighting strip that can accomplish the functions of known rope lights with greater energy efficiency and omni-directional light dispersion with color mixing, color changing, and color chasing capabilities.
It is a further object of the present invention to provide a flexible LED lighting strip that is both flexible and versatile, and capable of being configured into numerous configurations and of maintaining the selected configuration.
It is yet another object of the present invention to provide a method of manufacture of a flexible LED lighting strip that is efficient and cost effective.
LEDs are available in different shapes and sizes.
The LEDs used in the following examples are high luminous intensity lamp types available from Nichia Corporation.
They are also readily available from other sources among which are Gelcore Lighting LLC, a joint company comprising GE Lighting and EMCORE Corporation and Lumileds Lighting LLC, a joint venture between Agilent Technologies (formerly with Hewlett Packard) and Philips Lighting.
The LEDs include the 5 mm discrete axial lead types and Surface Mount Device (SMD) LED devices.
A minor drawback at present is the individual retail price of a single white LED.
The cost decreases a bit when purchasing in larger quantities, but the overall cost is still high.
At the present time of this application a single white LED from Nichia Corporation will cost $0.
70 even when buying in quantities of 100,000 pieces.
The cost of using LEDs can be justified in view of the energy savings, their lower current draw, the low profiles that can be achieved, and their low operating temperature.
LEDs are also maintenance free and have a longer lamp life.
The price of individual LEDs will fall as their luminous intensity and performance will continue to increase.
In addition, the direct generation of colored light by the selection of the type of LED used will make redundant the need for colored lenses with consequent improvements in efficiency, visibility, and cost
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