Oblique LED Reflector Layout for Compact Light Extraction
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Solution Overview
Problem
Existing light emitting devices require improvements in the arrangement of components to effectively condense and extract light, as they often have a wide light extraction region that is not necessary for all applications, and there is room for optimizing the distribution and convergence of light from multiple light-emitting elements.
Innovation Solution
A light emitting device design featuring oblique arrangements of light-emitting elements and reflective surfaces, where light from multiple elements is obliquely oriented to converge and be reflected onto a compact light extraction region, utilizing a base with stepped portions and reflective members to direct light efficiently into a wavelength conversion member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light-emitting elements are arranged with parallel optical axes to ensure adequate light extraction region, then light extraction is reliable, but the device size and component arrangement flexibility are reduced
Solution Approach 1:
The patent applies asymmetry by arranging light-emitting elements with different optical axis orientations rather than parallel alignment. Specifically, the first light-emitting element has its optical axis oriented at a first angle, while the second light-emitting element has its optical axis oriented at a second angle different from the first. This asymmetric arrangement allows light from multiple elements to be effectively combined and extracted through the wavelength conversion member without requiring a large extraction region, thus maintaining reliability while improving design flexibility.
Solution Approach 2:
The patent utilizes dimensional transformation by converting light from multiple spatially separated emitting elements into a concentrated extraction region through angular differentiation. By orienting optical axes at different angles, the patent effectively maps light paths from multiple dimensions into a focused extraction area, reducing the required extraction region size while maintaining effective light extraction.
2Productivity
If a wide light extraction region is used to accommodate multiple light-emitting elements, then light extraction is effective, but the overall device size increases
Solution Approach 1:
The patent employs asymmetric optical axis arrangement to concentrate light from multiple emitting elements into a smaller extraction region. The first light-emitting element emits light at a first angle and the second light-emitting element emits light at a second angle, allowing their light paths to converge or be effectively managed within a compact extraction region, thereby maintaining high extraction efficiency while reducing device area.
Solution Approach 2:
The patent changes the orientation parameter of light-emitting elements by setting different optical axis angles. This parameter modification allows the system to achieve effective light extraction in a compact configuration, as the angular differentiation enables better spatial management of light paths without requiring a large extraction region.
3Area of stationary object
If light-emitting elements are arranged obliquely to condense light onto a smaller extraction region, then device size is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements asymmetric angular arrangement of light-emitting elements, where the first element is oriented at a first angle and the second element at a second angle. This asymmetric design enables light condensation onto a smaller extraction region while establishing clear, reproducible angular relationships that can be maintained through standard manufacturing tolerances.
Solution Approach 2:
By modifying the orientation parameters (angles) of light-emitting elements, the patent achieves compact light extraction. The specific angular parameters are chosen to balance the benefits of reduced extraction region size with achievable manufacturing precision, making the design practically implementable.
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 design effectively condenses and extracts light from multiple elements onto a smaller light extraction region, enhancing light utilization and efficiency within the device.
Implementation Method 1
one or more light reflective members 40 arranged on the mounting surface 111 and providing one or more light reflective surfaces 41 on one virtual plane... light from the first light-emitting element 20 and light from the second light-emitting element 20 reflected by the one or more light reflective surfaces 41 are brought closer to each other before entering a light extraction region
Data Source
AI summary
A light emitting device includes: a base having a mounting surface; one or more light reflective members arranged on the mounting surface and providing one or more light reflective surfaces on one virtual plane; a first light-emitting element having a first light-exiting surface facing toward the one or more light reflective surfaces, arranged on the mounting surface such that the first light-exiting surface is oblique relative to the one or more light reflective surfaces, and wherein light emitted from the first light-exiting surface is irradiated on the one or more light reflective surfaces; and a second light-emitting element having a second light-exiting surface facing toward the one or more light reflective surfaces, arranged on the mounting surface such that the second light-exiting surface is oblique relative to the first light-exiting surface, and wherein light emitted from the second light-exiting surface is irradiated on the one or more light reflective surfaces.