Lighting Device UV Spread Collimated White
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Solution Overview
Problem
Artificial white light sources lack certain spectral components, such as UV light, which are beneficial for human health, but UV point light sources are harmful and cause glare.
Innovation Solution
A lighting device that emits collimated white light while spreading UV light to larger angles using a spectrally selective light exit window or collimator, making UV light less harmful and reducing glare, with options including scattering, diffraction, reflection, or conversion of UV light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If UV point light sources are used to provide UV light, then UV light is emitted, but the UV light is harmful to skin and causes high glare
Solution Approach 1:
The patent segments the UV light emission by using multiple UV LEDs arranged in an array rather than a single point source. This spatial segmentation allows the UV light to be distributed over a larger area, reducing the intensity concentration that causes harm and glare while maintaining overall UV output for vitamin D production.
Solution Approach 2:
The patent transitions from point source emission to planar surface emission by arranging UV LEDs in a two-dimensional array. This dimensional change allows UV light to be emitted from an extended surface area, distributing the harmful effects over a broader region and reducing the intensity at any single point, thereby minimizing skin harm and glare.
2Illumination intensity
If white light is emitted from a point source, then high intensity light is produced, but glare is caused
Solution Approach 1:
The patent uses multiple white LEDs arranged in an array to segment the light emission. Instead of a single intense point source, the light is distributed across multiple sources, maintaining high overall illumination intensity while reducing the concentrated glare associated with point sources.
Solution Approach 2:
The patent transitions from point source to planar surface emission for white light by arranging LEDs in a two-dimensional configuration. This dimensional expansion distributes the light over a larger area, maintaining brightness while eliminating the directional glare characteristic of point sources.
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 provides a combined white and UV lighting device where UV light is harmless or less harmful, and glare from white light is minimized, while maintaining high color rendering index and efficiency.
Implementation Method 1
a collimator adapted to collimate the white light
Implementation Method 2
The light exit window is adapted to scatter the ultraviolet light while allowing the white light to pass without (substantial) scattering
Implementation Method 3
The light exit window is adapted to diffract the ultraviolet light while allowing the white light to pass without (substantial) diffraction
Implementation Method 4
The light exit window may here for example comprise a phosphor layer
Data Source
AI summary
The present invention relates to a lighting device (12) comprising at least one light source (12a, 12b) adapted to emit white light and ultraviolet light, a collimator (18) adapted to collimate the white light, and a light exit window (16) through which the collimated white light and the ultraviolet light may pass into the ambient, wherein the lighting device is adapted to emit the collimated white light while spreading the ultraviolet light.