Transparent Reflecting Device with Saw-Tooth Structures for Lighting
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Solution Overview
Problem
Electroplated reflectors in lamps suffer from high light loss due to their absorptivity, leading to poor luminous efficiency, with loss ratios of 5% for argentum, 9% for aurum, and 12% for aluminum films.
Innovation Solution
A lighting apparatus featuring a reflecting device with a transparent annular shape and internal surfaces comprising continuous saw-tooth structures, where the first and second refracting surfaces intersect, allowing for total reflection and improved luminous efficiency without the need for electroplating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If an electroplated reflector is used, then the reflecting function is provided, but light loss increases and luminous efficiency decreases
Solution Approach 1:
The patent removes the electroplated metallic film from the reflector surface, extracting the harmful absorbing layer while retaining the functional requirement for light reflection. The transparent reflecting device eliminates the need for electroplating, thereby removing the source of light loss associated with metallic coatings.
Solution Approach 2:
The patent replaces the traditional electroplated metallic film (mechanical/chemical system) with a transparent micro-structured surface (optical system). The micro-prism array structure on the transparent substrate achieves light reflection and redirection through geometric optics rather than metallic reflection, eliminating the need for electroplating and its associated light absorption.
2Illumination intensity
If an electroplated metallic film is applied, then the reflecting surface is formed, but light absorptivity increases
Solution Approach 1:
The patent changes the physical and optical parameters of the reflecting surface by using a transparent material with micro-structures instead of a metallic film. This parameter change allows light to pass through and be redirected without the high absorption characteristics of metallic coatings, thereby improving light output while reducing energy loss.
Solution Approach 2:
The patent employs a composite structure combining a transparent substrate (such as glass or transparent plastic) with a micro-prism array surface layer. This composite material approach achieves effective light redirection while maintaining transparency and minimizing absorption, overcoming the limitations of single-material electroplated surfaces.
3Reliability
If a transparent reflecting device with micro-structures is used, then light loss is reduced, but device complexity increases
Solution Approach 1:
The patent divides the reflecting device into distinct functional components: a transparent substrate and a micro-prism array surface structure. This segmentation allows for specialized optimization of each component while maintaining overall simplicity. The modular design facilitates manufacturing and assembly, reducing the practical complexity despite the advanced optical functionality.
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 design enhances luminous efficiency by ensuring total reflection of light within the reflecting device, reducing light loss and improving the overall performance of the lamp.
Implementation Method 1
each of the saw-tooth structures includes a first refracting surface and a second refracting surface intersected with each other
Implementation Method 2
the reflecting wall is transparent... ensuring total reflection of light within the reflecting device
Data Source
AI summary
The present disclosure discloses a lighting apparatus, including a lamp body, an optical element connected with the lamp body, a driving power source assembly, a light source assembly and a reflecting device configured to provide a secondary light distribution for the light source assembly which are received in the lamp body; the reflecting device is provided with a light inlet, a light outlet and a reflecting wall located between the light inlet and the light outlet; the reflecting wall is transparent, and includes an internal surface and an external surface; the internal surface includes a plurality of saw-tooth structures, each of the saw-tooth structures includes a first refracting surface and a second refracting surface intersected with each other, two ends of each of the saw-tooth structures extend towards the light inlet and the light outlet; and the light source assembly is disposed at the light inlet of the reflecting device.