Automotive Windshield Antifog Sheet Layout for Sensor Clarity
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Solution Overview
Problem
The existing windshield designs for vehicles with integrated information acquisition devices, such as cameras and radars, face issues with fogging due to alkali components from the glass depositing on antifog sheets, leading to opacity and inaccurate light irradiation, which can result in incorrect distance calculations between vehicles.
Innovation Solution
A windshield with a laminated glass structure featuring a blocking layer and an antifog sheet with a sticky layer, substrate film, and antifog layer, where the glass plates have different tin oxide concentrations, and the antifog sheet is attached to the interior side with the sticky layer facing inwards to prevent alkali component deposition and maintain transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an antifog sheet is attached to the information acquisition region to prevent fogging, then the antifog function is provided, but alkali components from the glass deposit on the antifog sheet causing opacity and inhibiting light transmission
Solution Approach 1:
A coating layer is applied to the glass plate surface to serve as an intermediary barrier between the glass and the antifog sheet. This coating prevents alkali components from the glass from depositing on the antifog sheet, thereby maintaining the antifog sheet's transparency and functionality over time.
Solution Approach 2:
The surface properties of the glass plate are modified by applying a coating that changes the chemical composition and surface characteristics. This parameter change prevents the migration of alkali components to the antifog sheet interface.
2Reliability
If a coating is applied to the information acquisition region to provide antifog function, then the antifog function is achieved, but uniform application is difficult on small regions causing surface unevenness that inhibits information acquisition
Solution Approach 1:
Instead of applying a coating directly to the glass, a separate antifog sheet is used as a disposable or replaceable component. This sheet can be mass-produced with uniform antifog properties and then attached to the glass surface, avoiding the manufacturing difficulties of direct coating application.
Solution Approach 2:
The antifog function is separated from the glass substrate by using a distinct antifog sheet layer. This segmentation allows the antifog properties to be provided by a specialized sheet that can be uniformly manufactured independently of the glass coating process.
3Reliability
If the antifog sheet becomes opaque due to alkali deposition, then light transmission is blocked, but the information acquisition device cannot accurately receive light for distance calculation
Solution Approach 1:
The coating layer acts as a protective intermediary that prevents alkali components from reaching and depositing on the antifog sheet. This maintains the optical clarity of the antifog sheet, ensuring that light from the information acquisition device can pass through accurately for distance measurements.
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
Ensures accurate light emission and reception by the information acquisition devices, preventing fogging and maintaining the transparency of the antifog sheet, thus ensuring precise information processing and vehicle distance calculations.
Implementation Method 1
an antifog sheet in which at least a sticky layer, a substrate film, and an antifog layer are layered in this order, the sticky layer being attached to at least a surface on a vehicle interior side of the information acquisition region
Implementation Method 2
the laminated glass includes at least one glass plate in which surface concentrations of tin oxide in two principal surfaces are different
Data Source
AI summary
The present invention is a windshield for an automobile on which an information acquisition device configured to acquire information from the outside of a vehicle by emitting and/or receiving light can be arranged. The windshield includes: a laminated glass including an information acquisition region that is opposite to the information acquisition device and through which the light passes; and an antifog sheet in which at least a sticky layer, a substrate film, and an antifog layer are layered in this order, the sticky layer being attached to at least a surface on a vehicle interior side of the information acquisition region. The laminated glass includes at least one glass plate in which surface concentrations of tin oxide in two principal surfaces are different, and a surface of the glass plate in which the concentration of tin oxide is higher faces the vehicle interior side.