Observer-Adaptive Table Lamp Layout for Direct and Reflected Glare
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Solution Overview
Problem
Existing table lamps fail to effectively address both direct and reflected glare, particularly when reading glossy materials, as polarized light solutions are inadequate for varying viewing angles.
Innovation Solution
A table lamp with multiple light sources, each with adjustable illumination directions, controlled by a system that ensures specular peak intensity angles are below a reflected glare avoidance angle and sight angles from the light source to the observer are greater than a direct glare avoidance angle, minimizing glare through precise light source positioning and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If polarized light is used to reduce reflected glare, then reflected glare is reduced for a specific viewing angle, but reflected glare becomes an issue once the observer deviates from that viewing angle
Solution Approach 1:
The lighting system is divided into multiple independent light sources arranged at different positions and orientations. Each light source is controlled independently based on the observer's position, allowing the system to segment the illumination task into multiple directional components that collectively avoid reflected glare across various viewing angles.
Solution Approach 2:
The lighting system dynamically adjusts which light sources are active based on the real-time position of the observer. The control arrangement modifies the illumination configuration adaptively, changing the state of light sources as the observer moves, thereby maintaining glare-free illumination across different viewing angles.
2Object-affected harmful factors
If light sources are positioned to avoid direct glare by being outside the observer's field of view, then direct glare is avoided, but the illumination coverage and intensity may be reduced
Solution Approach 1:
Multiple light sources are distributed around the task area, with each source positioned to illuminate a specific zone while remaining outside the direct line of sight. This segmentation allows comprehensive coverage of the task area without any single source causing direct glare to the observer.
Solution Approach 2:
Different light sources are assigned to illuminate different local areas of the task surface. Each light source is positioned and oriented to provide optimal illumination for its designated zone while maintaining glare-free conditions for the observer's position.
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 effectively reduces both direct and reflected glare, providing comfortable and homogeneous illumination for the observer, especially when reading glossy materials, by ensuring light sources are outside the direct line of sight and angled to avoid specular reflection.
Implementation Method 1
reflected glare is mainly caused by the specular components of the total reflection that occur on an illuminated surface
Data Source
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AI summary
Provided is a table lamp for illuminating a task area of a table. A plurality of light sources are provided, each with a different illumination direction toward the task area. A control arrangement is provided such that the plurality of light sources are controlled based on a position of the observer. Specifically, the control arrangement determines whether each light source meets criteria governing whether the observer may experience direct and reflected glare. Indeed, if a specular peak intensity angle of the light source is less than a reflected glare avoidance angle corresponding to a position of an observer, and a sight angle from the light source to the observer is greater than a direct glare avoidance angle corresponding to the position of the observer, then the light source may be controlled to illuminate the task area. In this way, specularly reflected light glare, as well as direct light glare, may be avoided.