Switchable Window Glazing for Train Sunlight Control
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Solution Overview
Problem
Conventional window blinds in vehicles, such as trains, require frequent maintenance and repair due to mechanical or electromechanical drives, which can be cumbersome and unreliable for controlling sunlight exposure.
Innovation Solution
A laminated window construction with electrically switchable layer means and a touch-sensitive control system that allows for adjustable transparency, eliminating the need for mechanical blinds by using electrochromic layers and a touch screen interface for easy operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical or electromechanical blinds are used to control sunlight exposure, then the window can be darkened, but the blinds require frequent maintenance and repair
Solution Approach 1:
The patent replaces mechanical or electromechanical blind systems with an electrically switchable layer means (such as electrochromic or liquid crystal layers) that can be controlled by applying electrical voltage. This substitution eliminates moving parts, mechanical drives, and complex control mechanisms, thereby eliminating the need for maintenance and repair while providing reliable sunlight control.
Solution Approach 2:
The patent changes the optical parameter (transparency) of the window by applying electrical voltage to the switchable layer means. The layer transitions between transparent and opaque states based on the applied voltage, providing sunlight control without mechanical movement. This parameter-based control eliminates the need for mechanical adjustment and maintenance.
2Ease of repair
If electrically switchable layer means is used to eliminate mechanical blinds, then maintenance is reduced, but the device complexity increases
Solution Approach 1:
The patent merges the control functionality directly into the window structure by integrating the switchable layer means between the glass panes. The electrical contacts and control system are combined with the window assembly, creating a unified structure that simplifies the overall system while reducing maintenance needs.
Solution Approach 2:
The switchable layer means is designed to be self-contained within the window assembly, with electrical contacts integrated into the laminate structure. The system serves itself by using the window's existing electrical infrastructure to control the transparency, eliminating the need for separate mechanical control mechanisms and reducing overall system complexity.
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 solution provides reliable, low-maintenance control over sunlight transmission, allowing for gradual or complete darkening of windows, reducing the need for frequent repairs and enhancing passenger comfort.
Implementation Method 1
electrically switchable layer means (6, 46, 116, 126, 136, 146, 156, 166) having an inner electrode layer (6.1), an electrochromic layer (6.2), and an outer electrode layer (6.3)
Implementation Method 2
A voltage U supplied to the conductive layers 42 and 45 results in darkening of the pane
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The present invention refers to a window construction (1), particularly to be used in a train, vehicle, car, helicopter, aircraft or building, which comprises a laminated window glazing (9) having electrically switchable layer means (6) arranged in a laminate, and controlling means (14) being coupled to the switchable layer means (6) for controlling the sunlight transparency of the switchable layer means.