UV Light Emitting Device With Varying Lens Curvature For Uniform Curing
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Solution Overview
Problem
Conventional light emitting devices with semi-cylindrical lens portions arranged transversely often result in uneven light intensity distribution, leading to incomplete curing of ink or resin, as strong ultraviolet light can only cure the surface rather than the interior in a short time.
Innovation Solution
A light emitting device with a light-transmissive member featuring semi-cylindrical lens portions of varying radii of curvature arranged side by side transversely, where the second semi-cylindrical lens portions have a smaller radius of curvature than the first, ensuring a smoother and more uniform light intensity distribution across the target object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If strong ultraviolet light is used to irradiate the target object, then the surface curing speed is improved, but the interior curing becomes insufficient
Solution Approach 1:
The patent applies local quality by varying the radius of curvature of different semi-cylindrical lens portions. The first semi-cylindrical lens portions (at both ends) have a larger radius of curvature to reduce light intensity concentration, while the second semi-cylindrical lens portions (in the middle) have a smaller radius of curvature to maintain sufficient light intensity. This local differentiation allows the light-transmissive member to simultaneously achieve both surface curing speed and interior curing completeness by distributing light intensity appropriately across different regions.
2Ease of manufacture
If semi-cylindrical lens portions with the same radius of curvature are used, then the manufacturing process is simplified, but the light intensity distribution becomes uneven
Solution Approach 1:
The patent implements local quality by specifying different radius of curvature values for different regions of the semi-cylindrical lens portions. The first semi-cylindrical lens portions have a larger radius of curvature (R1) while the second semi-cylindrical lens portions have a smaller radius of curvature (R2), where R1 > R2. This local variation in optical parameters enables precise control over light intensity distribution, achieving uniform illumination across the target object while maintaining a relatively simple overall lens structure.
3Manufacturing precision
If the light-transmissive member covers all light-emitting-element rows, then the light distribution is improved, but the structural complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the light-transmissive member into multiple semi-cylindrical lens portions, each corresponding to a specific light-emitting-element row. These lens portions are arranged side by side in the transverse direction and can be formed as an integrated structure or separate components. This segmentation approach enables precise control over light distribution for each row while maintaining manufacturing feasibility through modular design and integration options.
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 the maximum slope of the light-intensity-distribution curve, preventing strong light from being applied in a short time and ensuring thorough curing of both surface and interior regions of the target object.
Implementation Method 1
The light-transmissive member includes three or more semi-cylindrical lens portions that are arranged side by side transversely to cover the three or more light-emitting-element rows. Each semi-cylindrical lens portion has a convex shape which bulges toward the upper surface side, and the radius of curvature varies to control light distribution.
Data Source
AI summary
A light emitting device is provided which includes a printed board, light emitting elements, and a light-transmissive member. The light emitting elements are arranged in three or more rows, and mounted on the printed board. The light-transmissive member includes three or more semi-semi-cylindrical lens portions that are arranged side by side transversely to cover the three or more rows. The heights of the tops of the semi-cylindrical lens portions are substantially equal to each other. The semi-cylindrical lens portions include first semi-cylindrical lens portions which are arranged to cover at least the both end rows, and a second semi-cylindrical lens portion which is arranged on the interior sides relative to the first semi-cylindrical lens portions in the transverse direction. The radius of curvature of the second semi-cylindrical lens portion is smaller than the first semi-cylindrical lens portions.