Layered Dimmer System Scattering Light to Prevent Hotspots
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Solution Overview
Problem
Dimmer wheels using halftone dots can cause undesirable visibility of dots in the projected light beam and heat dissipation issues, as well as heat problems in the lamp due to reflected light.
Innovation Solution
A dimmer system utilizing a glass substrate with a roughened surface for light scattering and a reflective layer to spread heat, combined with patterned frosting and reflector layers to minimize visibility and heat effects, and a semi-stochastic intensity pattern for reduced dimming, along with software control to manage lamp intensity and dimmer placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If halftone dots are used for dimming, then dimmer effect is achieved, but dots become visible in the projected light beam
Solution Approach 1:
The dimmer element is divided into multiple zones with different dot densities. The pattern includes a first region with a first density of dots and a second region with a second density of dots, where the densities differ. This segmentation allows different parts of the beam to have different dimming levels while the variation in density prevents the dots from being clearly visible as discrete elements.
Solution Approach 2:
Different regions of the dimmer element have locally optimized properties. The first region has a first dot density suitable for its specific dimming requirement, while the second region has a second dot density suitable for its requirement. This local quality variation achieves the desired dimming effect without creating uniform visible patterns throughout the entire beam.
2Illumination intensity
If halftone dots are used for dimming, then dimmer effect is achieved, but heat dissipation problems occur
Solution Approach 1:
A transparent substrate is introduced as an intermediary layer between the light source and the dimmer element. This substrate allows light to pass through while providing a surface for the dot pattern. The substrate acts as a thermal barrier that isolates the heat-generating dot pattern from the light source, preventing direct thermal coupling and reducing heat dissipation problems.
3Illumination intensity
If light reflects back at the lamp source, then some parts of the light are directed back, but heat problems occur in the lamp
Solution Approach 1:
The reflective property of the dot pattern, which initially causes harmful heat reflection back to the lamp, is converted into a beneficial effect. By carefully designing the dot density and distribution, the reflection is optimized to direct light away from the lamp source while still providing the desired dimming effect. The same reflective property that causes the problem is harnessed to solve the light direction control problem.
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 minimizes the visibility of dimmer effects in the projected beam and reduces heat issues, allowing for precise control of light intensity while maintaining high output without overheating, through a combination of hardware and software control.
Implementation Method 1
A dimmer system utilizing a glass substrate with a roughened surface for light scattering
Implementation Method 2
a reflective layer to spread heat, combined with patterned frosting and reflector layers
Data Source
AI summary
A layered dimmer formed of different layers. The front layer may be a scattering layer, and the back layer may be a reflective layer. The light beam is scattered prior to reflecting, to avoid reflection back to form hotspots.