Curved Chamfered Glass Substrate for In-Vehicle Glare Reduction
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Solution Overview
Problem
In-vehicle display devices experience rapid changes in light direction and intensity, leading to strong reflections at chamfered portions of the cover glass, which can cause glare and distract drivers.
Innovation Solution
A glass substrate design with convex curved chamfered portions, specifically a second boundary surface with a radius of curvature between 0.1 mm and 2.0 mm, and an angle of 10° to 45° with the major surface, reduces glare by minimizing reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a flat chamfered portion is used on the cover glass, then the manufacturing process is simple, but strong light reflections occur causing glare to drivers
Solution Approach 1:
The chamfered portion is designed with a convex curved surface instead of a flat surface. The curvature radius is specifically controlled to be 0.01 mm or more and 1.0 mm or less to effectively scatter reflected light and reduce glare while maintaining manufacturing feasibility
Solution Approach 2:
The curvature is applied locally only to the chamfered portion where light reflection occurs, while the main body of the cover glass remains flat. This targeted application reduces glare at the critical location without complicating the overall manufacturing process
2Object-affected harmful factors
If the curvature radius of the chamfered portion is increased, then glare is reduced, but the structural strength of the cover glass decreases
Solution Approach 1:
The curvature radius is optimized within a specific range (0.01 mm to 1.0 mm) to balance glare reduction and structural strength. This parameter optimization ensures sufficient light scattering while maintaining the mechanical integrity of the cover glass
3Strength
If the curvature radius of the chamfered portion is decreased, then structural strength is maintained, but manufacturing precision requirements increase
Solution Approach 1:
The lower limit of the curvature radius (0.01 mm) is set to ensure that the curvature is sufficient to scatter light effectively while remaining manufacturable with standard precision capabilities, avoiding the need for extremely tight tolerances
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 suppresses glare from chamfered portions, reducing the amount of reflection light entering the driver's eyes and enhancing visibility in varying light conditions.
Implementation Method 1
the second boundary surface 6 which is a convex curved surface... effectively suppresses glare from chamfered portions, reducing the amount of reflection light entering the driver's eyes
Data Source
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Figure 6
AI summary
Provided are a glass substrate having excellent antiglare properties in a chamfer part, and a method for manufacturing the glass substrate. This glass substrate comprises a first main surface, a second main surface as a main surface on the reverse side from the first main surface, an end surface interposed between the first main surface and the second main surface, a first boundary surface which is disposed between the first main surface and the end surface and connected to the end surface, and a second boundary surface connected to the first main surface and the first boundary surface, the second boundary surface being a curved surface that is convexly curved, and the curvature radius R2 of the second boundary surface being 0.1 mm to 2.0 mm.