LED Lighting Device with Optical Fiber Light-Outcoupling
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Solution Overview
Problem
Existing lighting systems with solid-state light sources face inefficiencies due to the need for light conversion and complex multi-layer optical coatings, making them costly and complicated.
Innovation Solution
A lighting device with an optically coupled solid-state light source and separate optical means featuring a light-outcoupling surface, allowing direct emission of light without conversion, and incorporating a screw or bayonet base for compatibility with existing fixtures, along with electronic driving means for control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light conversion means are used to convert blue light to appropriate wavelength, then the lighting device can emit light in the desired wavelength range, but the efficiency is reduced and the device becomes more complex
Solution Approach 1:
The patent removes the light conversion means from the system entirely. Instead of converting blue light from LEDs to other wavelengths, the invention uses multiple LEDs emitting different wavelengths (red, green, blue) directly, eliminating the conversion step and associated energy losses.
Solution Approach 2:
The lighting device is segmented into multiple independent LED sources, each emitting a specific wavelength range. This allows direct emission of desired wavelengths without needing to convert from a single blue LED source, thereby maintaining efficiency.
2Illumination intensity
If multi-layer optical coating is applied on the inner side of the envelope, then light reflection towards conversion means is improved, but the device complexity and cost increase
Solution Approach 1:
The patent eliminates the multi-layer optical coating by removing the conversion means. Since there is no conversion means requiring light reflection, the complex optical coating is no longer needed, simplifying the device structure and reducing cost.
Solution Approach 2:
Instead of using optical coatings to redirect light from LEDs to conversion means, the invention inverts the approach by having multiple LEDs directly emit light in the desired directions without requiring reflection or conversion intermediaries.
3Device complexity
If light conversion means are used, then the lighting device can function with a single LED source, but the overall system efficiency decreases
Solution Approach 1:
The single LED source is segmented into multiple LED sources (red, green, blue LEDs), each optimized for its specific wavelength emission. This segmentation eliminates the need for inefficient light conversion while maintaining manageable device complexity through modular LED components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables efficient, cost-effective lighting with a wide range of colors and long lifespan, suitable for replacing incandescent lamps with improved light distribution and control features.
Implementation Method 1
a solid-state light source (4), in operation emitting light
Implementation Method 2
the solid-state light source (4) being optically coupled to said optical means (5)
Data Source
AI summary
The invention relates to a lighting device (1) comprising an envelope (2), a base (3), a solid-state light source (4) and optical means (5) provided with a light-outcoupling surface, the solid-state light source (4) being optically coupled to said optical means (5). The use of a spirally wound optical fiber as optical means (5) and a transparant envelope (2) shaped as a conventional light bulb provides a lighting device (1) which is a good look-alike of the conventional incandescent lamp, such as, for instance, the carbon filament lamp. The long life-time and high efficiency of LEDs as a solid-state light source (4) will make this lighting device (1) a very attractive alternative for the conventional incandescent lamp. The lighting device (1) according to the present invention has the further advantage that a large gamut of colors can be chosen and adjusted by using, for instance, red green and blue LEDs in said lighting device (1). The electronics for driving and controlling the intensity and color settings can be incorporated in the lighting device (1).