LED Light-Emitting Element Illuminance Uniformity
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Solution Overview
Problem
LED light-emitting elements with small emission surfaces relative to reflecting frames tend to cause illuminance unevenness due to focused light reflection, leading to narrower irradiated areas and increased likelihood of uneven illumination.
Innovation Solution
The LED light-emitting element design features a substrate with an LED element, a phosphor resin for light emission, a reflective resin around the phosphor resin, and a reflecting frame with an opening, where the emission surface occupies 80% or more of the inside area of the reflecting frame, with the reflective resin exposed around the emission surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the emission surface is made small with respect to the inside area of the reflecting frame to improve light collection effect, then the light source becomes close to a point light source, but part of the light is reflected from the reflecting surface and irradiated to the object, causing illuminance unevenness
Solution Approach 1:
The patent applies local quality by creating different surface characteristics in different regions: the central region has a diffuse reflecting surface that scatters light uniformly, while the peripheral region has a specular reflecting surface that directs light at specific angles. This spatial variation in surface properties resolves the contradiction by enabling both efficient light collection and uniform illuminance distribution across the object surface.
2Productivity
If the emission surface area is reduced to create a point light source effect, then light collection is improved, but the area on the object where reflected light overlaps becomes narrower, increasing illuminance unevenness
Solution Approach 1:
The patent resolves this contradiction by transitioning from a two-dimensional planar reflecting surface to a three-dimensional hemispherical reflecting surface. This dimensional change allows the reflecting surface to extend in multiple directions, increasing the overlap area of reflected light on the object while maintaining an small emission surface area, thus achieving both efficient light collection and broad uniform irradiation.
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
This configuration reduces illuminance unevenness by ensuring a broader irradiated area with more uniform light distribution, minimizing streaks and shadows, and maintaining high illuminance across the target surface.
Implementation Method 1
a phosphor resin arranged on the substrate so as to seal the LED element and having an emission surface from which light based on the light emitted from the LED element is emitted
Implementation Method 2
a reflecting frame having an opening and at least part of which is arranged on the reflective resin, wherein the reflective resin is arranged directly under the reflecting frame and on the side surface of the phosphor resin
Data Source
AI summary
An LED light-emitting element having reduced the occurrence of illuminance unevenness is provided. A light-emitting element comprising a substrate, an LED element mounted on the substrate, a phosphor resin arranged on the substrate so as to seal the LED element and having an emission surface from which light based on light emitted from the LED element is emitted, a reflective resin arranged around the phosphor resin; and a reflecting frame having an opening and at least part of which is arranged on the reflective resin, wherein the reflective resin is arranged directly under the reflecting frame and on the side surface of the phosphor resin, the ratio of the area of the emission surface to the area of an inside area of the reflecting frame is set to 80% or higher, and in the inside area of the reflecting frame, the reflective resin is exposed around the emission surface.