Phosphor-Coated Light Envelope for High-Flux Glare Reduction
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Solution Overview
Problem
Existing lighting devices with high flux sources can become very glary and unpleasant to use due to excessive brightness, and existing glare reduction methods may not be practical or aesthetically appealing.
Innovation Solution
A lighting device with a translucent envelope coated in a phosphor layer that absorbs and re-emits light, increasing the effective emitting area and reducing glare without altering the light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light emitting element is used as a high flux source (e.g., 800 lumen), then the illumination intensity is improved, but the glare increases and becomes unpleasant to use
Solution Approach 1:
The patent transitions from a point-source light emission to a surface-distributed light emission by coating the envelope with phosphor. This spreads the light across the entire envelope surface area, effectively increasing the emitting area from a small point to a large surface, thereby reducing the luminance and glare while maintaining total flux.
Solution Approach 2:
The phosphor coating acts as an intermediary between the light emitting element and the observer. It absorbs light from the small-area source and re-emits it across the larger envelope surface, mediating the transition from high-intensity point source to distributed surface emission, thus reducing glare.
2Object-affected harmful factors
If the effective area of the light emitting element is increased to reduce glare, then the glare is reduced, but the light emitting element must be altered which may affect aesthetic and practical reasons
Solution Approach 1:
The patent separates the light generating function (light emitting element) from the light distributing function (phosphor-coated envelope). The light emitting element remains unchanged and compact, while the envelope handles the glare reduction through its phosphor coating. This segmentation allows each component to optimize its function independently.
Solution Approach 2:
The phosphor coating on the envelope serves as an intermediary that provides the glare reduction function without requiring modification of the light emitting element itself. The envelope acts as a mediator between the unchanged light source and the observer, distributing light across its larger surface area.
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 phosphor-coated envelope effectively increases the light-emitting area, providing high flux with low glare, enhancing eye comfort and aesthetic appeal while maintaining the light source's appearance.
Implementation Method 1
The layer of phosphor will absorb some of the light emitted by the light emitting element and re-emit the light (through electron relaxation photon emissions)
Data Source
AI summary
A lighting device (10) is provided. The lighting device (10) comprises: a light emitting element (11), and a translucent envelope (20) enclosing the light emitting element (11) and having a surface area at least three times bigger than the light emitting area of the light emitting element (11), wherein the envelope (20) is coated with a layer (22) of phosphor with a thickness of 0.05-1.0 mm and the layer (22) of phosphor is configured to block less than 30% of the visible light emitted by the light emitting element (11).