Laser Glass Welding Unstable Region Stabilization
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Solution Overview
Problem
The existing glass fusing methods using laser light to fuse glass members together often result in a nonuniform fused state due to variations in laser light absorptance and incomplete decomposition of binders, leading to cracks, crystallization, and bubble formation.
Innovation Solution
A glass fusing method involving the arrangement of a glass layer with a binder, laser-light-absorbing material, and glass powder along a ring-shaped region, where the layer is initially irradiated with first laser light to melt and fix the glass, and then re-irradiated to stabilize and decompose the binder, ensuring a uniform fusion state by converting unstable regions into stable ones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser light is used to fix the glass layer to the glass member, then the energy consumption is reduced and the heating time is shortened, but the fusing state becomes nonuniform due to drastic increase in laser light absorptance when the glass layer temperature exceeds its melting point
Solution Approach 1:
The patent applies preliminary action by performing a first laser irradiation to fix the glass layer to the glass member before the main fusing operation. This preliminary fixation establishes a stable baseline state, preventing the glass layer from detaching during subsequent heating, and allows the main fusing process to proceed with uniform laser light absorptance and consistent fusing quality.
2Stability of the object's composition
If the laser light is advanced after staying at the irradiation start position to yield a stable melting region, then a stable melting region is achieved, but the center part enters an excess heat input state causing cracks or crystallization
Solution Approach 1:
The patent applies local quality by differentiating the laser irradiation approach between the center part and both ends of the glass layer. The center part receives continuous laser irradiation to maintain stable melting, while the both ends receive delayed or reduced irradiation to prevent excess heat input. This localized differentiation of irradiation timing and intensity resolves the contradiction between achieving stable melting and avoiding harmful overheating.
3Strength
If the glass layer is irradiated with laser light to melt the glass frit, then the glass layer is fixed to the glass member, but the binder remains incompletely decomposed leading to bubble formation
Solution Approach 1:
The patent applies segmentation by dividing the laser irradiation process into two distinct stages: a first irradiation stage focused on melting the glass frit and fixing the glass layer to the glass member, and a second irradiation stage focused on heating the both ends to completely decompose the binder. This segmented approach ensures that bonding strength is established first, then reliability is improved by complete binder decomposition without causing glass layer detachment.
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 method produces a highly reliable glass fusing structure with uniform fusion and complete binder decomposition, preventing cracks and bubbles, and ensuring a stable bond between glass members.
Implementation Method 1
irradiating the glass layer with laser light along the region to be fused
Implementation Method 2
the laser light absorptance of the glass layer rises drastically
Implementation Method 3
irradiating the glass layer with first laser light... so as to gasify the binder
Implementation Method 4
melt the glass powder... so as to fuse the first and second glass members to each other
Data Source
AI summary
When fixing a glass layer 3 to a glass member 4 by gasifying a binder and melting a glass fit 2, the glass layer 3 is irradiated with laser light L1 along a region to be fused R from an irradiation start position A in the region to be fused R to the irradiation start position A and then continuously again along an unstable region from the irradiation start position A to a stable region start position B in the region to be fused R, so as to re-melt the glass layer 3 in the unstable region, thereby removing the binder, thus turning the unstable region into a stable region, whereupon the glass layer 3 is fixed to the glass member 4.