Light Guide Diffusion Portions for Uniform Illumination
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Solution Overview
Problem
Existing illumination apparatuses struggle to diffuse light effectively in the longitudinal direction due to shallow recessed spherical surfaces, leading to inefficient light reflection and diffusion.
Innovation Solution
The illumination apparatus features a light guide with a reflection surface that includes diffusion portions of a spherical shape recessed from the reflection surface, with a depth of 16.5% to 50% and a width of 0.1 mm to 50% of the sphere's diameter, allowing for improved light diffusion and reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If recessed spherical surfaces are formed on the bottom surface of the light guide, then light diffusion is attempted, but the depth is too small to effectively scoop up reflected light
Solution Approach 1:
The patent changes the depth parameter of the recessed spherical surfaces from shallow ( ineffective) to a specific range of 16.5%-50% of the sphere diameter. This parameter optimization enables the diffusion portions to effectively scoop up reflected light while maintaining manufacturability, resolving the contradiction between achieving sufficient light diffusion and controlling manufacturing precision.
2Illumination intensity
If diffusion portions are made deeper to improve light diffusion, then light reflection and diffusion enhance, but manufacturing complexity increases
Solution Approach 1:
The patent establishes specific parameter ranges (depth: 16.5%-50% of sphere diameter, width: 0.1mm-50% of reflection surface width) that balance effective light diffusion with manufacturing feasibility. These optimized parameters prevent excessive structural complexity while achieving the desired optical performance.
Solution Approach 2:
The patent employs spherical diffusion portions with specific curvature characteristics. The spherical shape provides effective light diffusion through its geometric properties, while the controlled depth and width parameters ensure the structure remains manufacturable and does not become overly complex.
3Illumination intensity
If the width of diffusion portions is increased to improve light distribution, then diffusion effectiveness enhances, but the number of diffusion portions that can be formed decreases
Solution Approach 1:
The patent optimizes the width parameter of diffusion portions to a specific range (0.1mm-50% of reflection surface width). This optimization ensures sufficient light distribution uniformity while maintaining enough space to form multiple diffusion portions across the reflection surface, resolving the contradiction between diffusion effectiveness and quantity of diffusion portions.
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 enhances light diffusion and reflection, enabling more uniform light distribution along the light guide, improving the reading and imaging processes in applications like multi-function printers and scanners.
Implementation Method 1
a reflection surface that reflects the light to the emission surface
Implementation Method 2
a plurality of diffusion portions that diffuse the light
Data Source
AI summary
An illumination apparatus includes a light source and an elongated light guide, wherein the light guide includes an emission surface that emits light from the light source and a reflection surface that reflects the light to the emission surface, the reflection surface includes a plurality of diffusion portions that diffuse the light, the diffusion portions have a shape of part of a sphere recessed from the reflection surface, a depth of the diffusion portions from the reflection surface is equal to or greater than 16.5% and equal to or smaller than 50% of a diameter of the sphere, and a width of the diffusion portions is equal to or greater than 0.1 mm and equal to or smaller than 50% of a width of the reflection surface.