Printed Glass Plate Power Feed to Prevent Terminal-Induced Cracks
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Solution Overview
Problem
The connection terminal fixed to the electricity supply portion on a glass plate is prone to cause cracks in the glass plate or the electricity supply portion when subjected to external forces.
Innovation Solution
A glass plate module with an electricity supply portion formed using conductive print containing metal microparticles with a higher thermal expansion coefficient than the glass plate, and an antenna conductor also made from the same metal microparticles, where the electricity supply portion is thinner than the antenna conductor, and connected via lead-free solder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a connection terminal is fixed to the electricity supply portion on a glass plate, then electrical connection is achieved, but cracks may occur in the glass plate or electricity supply portion when external force acts on the connection terminal
Solution Approach 1:
The patent changes the material parameters of the electricity supply portion by using conductive print containing metal microparticles with a thermal expansion coefficient larger than that of the glass plate. This parameter change allows the electricity supply portion to be more flexible and less prone to cracking under external force, while maintaining electrical conductivity.
Solution Approach 2:
The electricity supply portion is formed as a composite material consisting of conductive print with metal microparticles embedded in a binder resin. This composite structure provides both electrical conductivity and mechanical flexibility, reducing the risk of cracks when external force is applied to the connection terminal.
2Strength
If the electricity supply portion is made thicker to increase strength, then crack resistance improves, but the difference in thermal expansion between the electricity supply portion and glass plate increases, potentially causing cracks
Solution Approach 1:
The patent carefully controls the thickness parameter of the electricity supply portion (D1) to be within a specific range (0.003mm to 0.05mm) and sets the thickness ratio D1/D2 between 0.4 and 0.9. This parameter optimization balances mechanical strength with thermal expansion compatibility, preventing cracks while ensuring adequate strength.
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 configuration suppresses the generation of cracks in the glass plate and electricity supply portion even under external force, ensuring durability and reliability.
Implementation Method 1
metal microparticles whose thermal expansion coefficient is larger than that of the glass plate
Implementation Method 2
a terminal fixed to the electricity supply portion via the solder
Implementation Method 3
an antenna conductor disposed on the glass plate; the electricity supply portion receiving electric power from the antenna conductor
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A glass plate module according to the present invention is a glass plate module to which a wire for supplying electric power is capable of being joined and includes a glass plate, a heating wire disposed on the glass plate, and an electricity supply portion that is disposed on the glass plate and supplies electric power to the heating wire. The electricity supply portion is formed using conductive print that contains, as a main component, metal microparticles whose thermal expansion coefficient is larger than that of the glass plate, and the electricity supply portion is thinner than the heating wire.