LED Lamp Parabolic Lens with Refractive Channel for Light Efficacy
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Solution Overview
Problem
Conventional LED lamps suffer from reflective losses and failure to refract peripheral light rays, leading to low optical efficiency in applications requiring high light output, such as streetlights and other outdoor lighting.
Innovation Solution
The design incorporates an optically-transparent lens with a parabolic section and a light-emitting diode assembly featuring an optically-transparent dome and fill material, minimizing optical interfaces to reduce reflections and refract peripheral light rays, thereby enhancing light efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional reflectors with parabolic shape are used to focus light, then reflected light rays are minimized, but direct light rays at an angle with respect to the axis cannot be focused and reflect back into the housing
Solution Approach 1:
The lens is divided into two distinct functional sections: a parabolic section for focusing reflected light rays and a prismatic section for refracting direct light rays. This segmentation allows each section to optimize its specific function, resolving the contradiction by handling different light ray types separately rather than using a single conventional reflector design.
Solution Approach 2:
The invention merges the functions of a conventional parabolic reflector with additional refractive elements into a single integrated lens assembly. By combining the parabolic section (for reflection) and the prismatic section (for refraction) into one unified optical component, the system achieves both reflected light minimization and direct light ray control, thereby improving overall light output efficiency.
2Ease of operation
If multiple optical interfaces are used in the housing, then light can be directed and focused, but internal reflections increase and reduce overall light efficacy
Solution Approach 1:
Different regions of the lens are assigned different optical properties: the parabolic section has reflective characteristics for handling angled light rays, while the prismatic section has refractive characteristics for directing peripheral light rays. This local differentiation allows precise control of light direction in different zones while minimizing unwanted reflections at each interface.
Solution Approach 2:
The optically-transparent dome filled with optically-transparent material acts as an intermediary element between the LEDs and the lens system. This intermediate medium helps to smooth the transition of light from the LED source into the lens, reducing abrupt refraction and reflection at interfaces, thereby controlling light direction while minimizing energy loss.
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
This configuration significantly improves light efficacy by minimizing internal reflections and effectively directing peripheral light rays outside the housing, resulting in more efficient light distribution and reduced energy loss.
Implementation Method 1
Light rays can also be reflected (e.g., internal reflection) to varying degrees at the interface based on their angle of incidence
Implementation Method 2
Light rays generally refract at the interface of media having different refractive indices
Data Source
AI summary
A light-emitting diode lamp includes an optically-transparent lens and an assembly. The lens includes a parabolic section defined about an axis and having a focus. The section includes a surface extending from the axis to a periphery of the section at a first end of the section, and a channel extending along the axis partially inside the section at a second end of the section. The assembly includes a chip and a dome. The chip is disposed in the channel at the focus of the section. The dome is disposed in the channel forming an interior space between the dome and the lens. The space is filled with an optically-transparent material having an index of refraction approximately equal to an index of refraction of the lens that eliminates or reduces effect of an optical interface between the material and the lens on direction of light emitted by the chip.