Glazing Temperature Sensor Attachment Using Conductive Tape
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Solution Overview
Problem
Existing temperature sensors for glazing face challenges in miniaturization and secure attachment without lead-containing solders, leading to potential detachment and thermal stress issues, especially in the automotive sector.
Innovation Solution
A temperature sensing device using a printed circuit board with a thermistor and thermally conductive double-sided tape for attachment to glazing, allowing for low-cost, small footprint measurement without welding, and enabling easy integration of additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a temperature sensor is welded on the glazing using lead-containing solders, then the mechanical stresses are compensated and the connection is secure, but the environmental regulations (End of Life Vehicles Directive) prohibit the use of lead-containing solders
Solution Approach 1:
The patent introduces a specialized electrical connection element with a specific geometry (thickness e between 0.05mm and 0.2mm, length l between 0.5mm and 2mm, and width w between 0.2mm and 1mm) that acts as an intermediary between the temperature sensor and the glazing. This intermediary element, combined with lead-free solder, provides adequate mechanical stress compensation and connection security while complying with environmental regulations by eliminating lead-containing solders.
2Volume of moving object
If the temperature sensor is made smaller for miniaturization, then it can be placed in previously inaccessible locations and more components can be placed on the same area, but the attachment security and thermal stress resistance may be compromised
Solution Approach 1:
The patent segments the temperature sensing device into distinct functional components: a miniaturized temperature sensor, a specialized electrical connection element, and a thermally conductive adhesive layer. This segmentation allows the sensor itself to be miniaturized while the attachment system is optimized separately for reliability, with the electrical connection element providing mechanical support and the thermally conductive adhesive ensuring secure attachment and thermal stress resistance.
3Object-affected harmful factors
If lead-free solder is used instead of lead-containing solder, then environmental compliance is improved, but the ductility and ability to compensate mechanical stresses is reduced
Solution Approach 1:
The patent changes the geometric parameters of the electrical connection element (thickness e, length l, and width w) to optimize its mechanical properties. By carefully controlling these dimensions, the connection element compensates for the reduced ductility of lead-free solder, providing adequate stress compensation while maintaining environmental compliance. The specific parameter ranges are designed to balance mechanical strength and flexibility.
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
Provides a low-cost, miniaturized, and securely attached temperature sensing solution that minimizes thermal stress and detachment risks, suitable for various applications including automotive glazing.
Implementation Method 1
The temperature sensing device is fixed to the glazing through the thermally conductive double-sided tape
Implementation Method 2
A temperature sensing device comprises a first printed circuit board having a first face and a second face, the temperature sensing device comprises a thermistor fixed on the said first face of the printed circuit board
Data Source
AI summary
A glazing includes a temperature sensing device for measuring the temperature of the glazing. The temperature sensing device is fixed to the glazing through a thermally conductive double-sided tape.