LED Lighting Apparatus with Segmented Reflection Sheets
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Solution Overview
Problem
Lighting apparatuses using LEDs generate high heat, leading to reduced lifespan and potential hot spots and glare issues.
Innovation Solution
A lighting apparatus design featuring a housing with parabolic back covers, heat radiation bodies, and reflection sheets that diffuse light emitted by LEDs, preventing glare and improving light uniformity by reflecting side and main lights onto a transparent sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LED lighting apparatus is used, then energy efficiency is improved, but heat generation increases causing reduced lifespan and hot spots
Solution Approach 1:
The lighting apparatus is divided into multiple light emitting modules arranged in an array, with each module having its own heat radiation body. This segmentation distributes the heat generation across multiple localized areas rather than concentrating it, allowing for better heat management while maintaining energy-efficient LED operation
Solution Approach 2:
A transparent sheet is introduced as an intermediary component between the light emitting modules and the external environment. This sheet diffuses the light and helps distribute heat more evenly, preventing hot spots while allowing the energy-efficient LEDs to operate
2Illumination intensity
If direct light emission is used, then illumination intensity is improved, but glare problems occur
Solution Approach 1:
A transparent diffusing sheet is placed between the high-intensity LED light sources and the external environment. This intermediary component maintains the high illumination intensity by preserving all the light output while diffusing it to eliminate glare, converting direct harsh light into softened, uniform illumination
Solution Approach 2:
Different regions of the light emitting modules emit light with different characteristics - side lights and main lights are reflected by different reflection sheets with different properties. This local differentiation allows each region to contribute to overall illumination while the combined effect prevents glare through distributed, multi-directional light emission
3Device complexity
If single reflection sheet is used, then device complexity is reduced, but light uniformity deteriorates
Solution Approach 1:
Different reflection sheets are assigned to different regions (side light reflection sheets versus main light reflection sheets) with different reflective properties optimized for their specific functions. This local specialization ensures that each region contributes appropriately to the overall light distribution, achieving uniform illumination while maintaining a relatively simple overall structure
Solution Approach 2:
The reflection system is segmented into multiple reflection sheets with different functions - some for reflecting side lights and others for reflecting main lights. This segmentation allows each reflection sheet to be optimized for its specific purpose, improving light uniformity while the modular nature keeps the overall device complexity manageable
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 enhances light uniformity and reliability by diffusing light and reducing glare, while effectively managing heat through the heat radiation structure.
Implementation Method 1
a first reflection sheet that is disposed on the heat radiation body and reflects a first side light emitted from the plurality of light emitting diodes to the transparent sheet
Implementation Method 2
a second reflection sheet that is disposed on an inner surface of the first back cover and reflects a main light emitted from the plurality of light emitting diodes to the transparent sheet
Implementation Method 3
a lighting apparatus for diffusing light irradiated from reflection sheets which are different from each other
Data Source
AI summary
According to an embodiment, there is provided a lighting apparatus including: a housing that has a first back cover having a parabolic shape and a recess opened below the first back cover; a first light emitting module that has a circuit board and a plurality of light emitting diodes arranged on the circuit board; a heat radiation body that is disposed in one region of the first back cover and has a first heat radiation portion in which the circuit board is disposed and a first reflection portion which extends from the first heat radiation portion along an contour line of an inner sphere surface of the first back cover; a transparent sheet that is disposed in an oblique shape between a high point of the recess of the first back cover and the heat radiation body; a first reflection sheet that is disposed on the heat radiation body and reflects a first side light emitted from the plurality of light emitting diodes to the transparent sheet; and a second reflection sheet that is disposed on an inner surface of the first back cover and reflects a main light emitted from the plurality of light emitting diodes to the transparent sheet, in which the first reflection sheet includes a plurality of reflection surfaces.