Laminated Glass Interlayer Film Wedge Profile for Double-Image Suppression
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Solution Overview
Problem
Conventional laminated glass interlayer films with uniform wedge angles struggle to effectively suppress transmitted double images, particularly when the wedge angle changes significantly, leading to issues in head-up displays where visibility is compromised.
Innovation Solution
An interlayer film with varying wedge angles, where the thickness increases from one end to the other, with specific sections having an inclination of approximate line A of -0.05 mrad/m or less and a maximum deviation in partial wedge angle of 0.2 mrad or less, is used to minimize double images by calculating the approximate line and deviation in partial wedge angles through a determined formula and calculation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the wedge angle of the interlayer film is increased to suppress double images, then the visibility in head-up displays is improved, but transmitted double images are generated when the wedge angle changes significantly
Solution Approach 1:
The patent applies local quality by making the wedge angle non-uniform across different regions of the interlayer film. Specifically, the wedge angle is set to be larger in the head-up display region to suppress double images and improve visibility, while being smaller in other regions to prevent transmitted double images. This regional differentiation resolves the contradiction by optimizing the wedge angle locally for each functional requirement.
Solution Approach 2:
The patent introduces dynamic control of the wedge angle through a variable inclination along the width direction. By making the wedge angle changeable across different positions rather than uniform, the system can adaptively suppress double images where needed while avoiding transmitted double images in other areas. The inclination is controlled to be within specific ranges (±0.05 mrad/m or less in certain sections) to maintain this balance.
2Ease of manufacture
If the wedge angle is made non-uniform to prevent creases and winding deviation, then the manufacturing and handling is improved, but transmitted double images are easily generated at positions where the wedge angle changes significantly
Solution Approach 1:
The patent uses dynamic variation of the wedge angle to resolve this contradiction. The inclination is designed to be non-uniform, with specific sections having inclination of -0.05 mrad/m or less, allowing the film to be handled without creases and winding deviation while controlling the rate of change to prevent transmitted double images.
Solution Approach 2:
The patent changes the parameter of wedge angle inclination from uniform to non-uniform distribution. By carefully controlling the inclination values in different sections (e.g., -0.05 mrad/m or less in specific sections), the film achieves both ease of manufacture/handling and suppression of transmitted double images through optimized parameter distribution.
Data Source
AI summary
Provided is an interlayer film for laminated glass with which transmitted double images in the laminated glass can be suppressed. An interlayer film for laminated glass according to the present invention has one end and the other end being at the opposite side of the one end, and the other end has a thickness larger than a thickness of the one end, and when an inclination of approximate line A and a maximum value of absolute values of deviation in partial wedge angle are calculated according to determination of a specific formula of approximate line A and calculation of deviation in partial wedge angle, the inclination of approximate line A is −0.05 mrad/m or less in at least one section A, and the maximum value of absolute values of deviation in partial wedge angle is 0.2 mrad or less.