Light Emitter Array Offset Layout for Gap-Free Irradiation
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Solution Overview
Problem
Existing light emitting devices face challenges in maintaining uniform irradiation patterns when the light source size increases to enhance light intensity, leading to gaps between irradiation regions.
Innovation Solution
A light emitting device configuration featuring a light emitting element array and optical systems, where the light emitting elements are arranged in parallel arrays with specific distance relationships between the optical axes and the centers of the light emitting elements, ensuring no gaps between irradiation regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light source size is increased to enhance light intensity, then the light intensity is improved, but gaps appear between irradiation regions
Solution Approach 1:
The patent applies asymmetry by deliberately offsetting the light emitting element array from the optical axis. The array is positioned at a distance of 0.05 to 0.2 times the focal length from the optical axis, creating an asymmetric configuration that causes the irradiation region to shift and overlap with adjacent regions, thereby eliminating gaps while maintaining high light intensity from the larger source size
Solution Approach 2:
The patent introduces a positional offset in the lateral dimension (perpendicular to the optical axis) rather than adjusting parameters along the optical axis. By displacing the light emitting element array laterally by a specific distance range, the irradiation pattern shifts to achieve overlap with adjacent irradiation regions, solving the gap problem through dimensional repositioning
2Device complexity
If the disposition interval of light sources is increased, then the light source arrangement is improved, but gaps appear between light source images
Solution Approach 1:
The patent uses asymmetric positioning of the light emitting element array relative to the optical axis. This asymmetric offset causes the projected light source images to shift laterally, enabling them to overlap and merge into a continuous illumination pattern even when the physical disposition interval between light sources is increased, thus reducing device complexity while maintaining image continuity
3Reliability
If the light source is sufficiently small compared to the optical system, then the optical system performance is improved, but the light intensity is reduced
Solution Approach 1:
The patent resolves this contradiction by moving the light source positioning problem from the optical axis dimension to the lateral dimension. By offsetting the light emitting element array laterally by 0.05 to 0.2 times the focal length, the system can use larger light sources (improving light intensity) while the lateral shift ensures the irradiation regions overlap properly, maintaining optical system performance without requiring infinitesimally small 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
This configuration effectively suppresses the formation of non-irradiation portions between parallel irradiation regions, maintaining consistent illumination and preventing the narrowing of the irradiation area.
Implementation Method 1
a first optical system that refracts light emitted from the first light emitting element array, and a second optical system that refracts light emitted from the second light emitting element array
Data Source
AI summary
A light emitting device includes a light emitting element array in which plural light emitting elements are arranged such that a length in one direction is w, the light emitting element array being a first light emitting element array and a second light emitting element array that are parallel to each other in the one direction, a first optical system that refracts light emitted from the first light emitting element array, and a second optical system that refracts light emitted from the second light emitting element array such that an irradiation region of the second light emitting element array is parallel to an irradiation region of the first light emitting element array in the one direction, in which a distance between an optical axis of the first optical system and a center of the first light emitting element array and a distance between an optical axis of the second optical system and a center of the second light emitting element array in the one direction are w/4 or more and w/2 or less.