Capacitive Sensor Integration in Automotive Glazing
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Solution Overview
Problem
Existing automobile glazing systems face challenges in integrating and controlling electrically powered functional assemblies, such as lighting and optical property modifiers, due to the need for accessible control means that do not disrupt the glazing's aesthetic and optical properties, while minimizing parasitic signal interference from other electronic components.
Innovation Solution
The implementation of capacitive sensors with conductive layers applied to a support inserted between the glass sheets of the glazing, which are designed to operate with multiple electrodes and signal processing to discriminate against parasitic influences, ensuring reliable and sensitive control while maintaining transparency and minimal visual impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If capacitive sensors with conductive layers are applied directly to the glass sheets of the glazing, then the control means are integrated into the glazing and aesthetically pleasing, but the control elements occupy a large surface area and significantly disrupt the visual appearance
Solution Approach 1:
The patent divides the control system into separate functional modules: capacitive sensors, processing units, and power supplies are distributed across multiple glass sheets rather than consolidated on a single sheet. This segmentation reduces the surface area required for each control element while maintaining full functionality, allowing transparent conductive layers to be applied only where needed on specific sheets.
Solution Approach 2:
The patent utilizes the third dimension by applying transparent conductive layers to the inner surfaces of glass sheets, embedding control elements within the glazing structure itself rather than placing them on the outer surface. This dimensional relocation allows control elements to be hidden within the transparent layers, maintaining aesthetic appearance while providing full control functionality.
2Illumination intensity
If transparent conductive layers are applied to control the functional assemblies, then the visual appearance and light transmission are maintained, but parasitic signals from other electronic components interfere with sensor operation
Solution Approach 1:
The patent introduces intermediary shielding layers and grounding structures between the capacitive sensors and other electronic components. These intermediary elements act as barriers that block parasitic electromagnetic signals while allowing the transparent conductive layers to maintain their light transmission properties. The shielding layers are strategically positioned to intercept interference before it reaches the sensitive sensor regions.
Solution Approach 2:
The patent applies different properties to different regions of the glazing: transparent conductive layers are applied only in specific local areas where control elements are needed, rather than covering entire sheets. This localized application minimizes the total conductive material present, reducing parasitic signals while maintaining control functionality. The conductive layers are concentrated in discrete zones rather than distributed uniformly.
3Ease of operation
If the control means are placed on external surfaces such as dashboard or door trim, then accessibility is improved, but the integration into the glazing is lost and aesthetic appeal is reduced
Solution Approach 1:
The patent designs the glass sheets to serve multiple functions simultaneously: they provide structural support, maintain optical clarity, and host integrated control elements through transparent conductive layers. The same glass sheets that form the glazing also contain the control interfaces, eliminating the need for separate external control components and reducing overall system complexity while maintaining accessibility.
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 solution allows for discreet, reliable, and efficient control of electrically powered assemblies within the glazing, minimizing interference and maintaining high light transmission and optical quality, while facilitating easier assembly and location of control elements.
Implementation Method 1
The sensors used for these commands are of the capacitive type and consist of conductive layers applied to this support
Data Source
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AI summary
The invention pertains to a motor vehicle glazing comprising two sheets of glass, outer and inner, brought together by means of one or more inserted thermoplastic sheets, at least one electrically powered functional assembly being inserted between the sheets of the glazing, a capacitive sensor controlling the power supply of the functional assembly by means of a unit for processing the signals emitted by the sensor, the sensor also being inserted into the glazing on a transparent substrate coated with an equally transparent conductive layer, a layer in which the sensor is formed.