Elongated Optical Member for Uniform Large-Area Lighting
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Solution Overview
Problem
Existing lighting systems for large areas often suffer from uneven irradiation, requiring multiple light sources and leading to inconsistent lighting.
Innovation Solution
An optical member with a first light guide member of elongated shape and a wavelength conversion layer containing phosphor on its lateral surface, designed to emit light uniformly across a wide area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple light sources are used to irradiate large areas, then the coverage area is increased, but the irradiation unevenness increases and device complexity increases
Solution Approach 1:
The light guide member is divided into multiple light emission sections along its length, with each section having independent light emission characteristics. This segmentation allows different portions of the light guide to emit light with different intensities and distributions, enabling uniform illumination across large areas while maintaining a single integrated light source structure.
Solution Approach 2:
Different sections of the light guide member are designed with different optical properties and structures to achieve localized light emission characteristics. The wavelength conversion layers are selectively positioned and configured in different regions to create varying light emission patterns, ensuring uniform irradiation distribution across the entire coverage area.
2Area of stationary object
If multiple light sources are used to irradiate large areas, then the coverage area is increased, but the device complexity increases
Solution Approach 1:
Multiple light emission functions are merged into a single light guide member structure. The light guide member integrates multiple light emission sections, wavelength conversion layers, and optical control mechanisms into one unified component, replacing the need for multiple separate light sources while achieving the same large area coverage.
Solution Approach 2:
The light guide member serves multiple functions simultaneously: it guides light from the light source, distributes light to multiple emission sections, performs wavelength conversion in different regions, and controls light emission patterns. This multi-functionality eliminates the need for separate components for each function, reducing device complexity.
3Illumination intensity
If spot lighting is used, then the light intensity is concentrated, but the number of light emitting devices required increases
Solution Approach 1:
The lighting system transitions from point-based spot lighting to line-based illumination along the elongated light guide member. This dimensional change allows light to be distributed continuously along the length of the light guide, covering large areas with a single device while maintaining sufficient light intensity through the elongated structure.
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 reduces irradiation unevenness, allowing for more consistent and efficient lighting coverage of large areas.
Implementation Method 1
a wavelength conversion layer disposed on the lateral surface of the first light guide member and containing a phosphor
Data Source
AI summary
An optical member includes a first light guide member having an elongated shape and comprising an end surface and a lateral surface extending in a longitudinal direction from the end surface; and a wavelength conversion layer disposed on the lateral surface of the first light guide member and containing a phosphor.