Laser-Cut Multilayer Glass Panels That Preserve Electrode Conductivity
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Solution Overview
Problem
Laser cutting of glass substrates often damages the electrode layer on underlying substrates, leading to inhibited electrical conductivity and transmission to electrically controllable optically active materials in smart structures.
Innovation Solution
A laser cutting technique that forms separation lines with spaced-apart defect columns extending through one glass substrate but not the other, maintaining the integrity of the electrode layer on the underlying substrate, allowing for electrical conductivity and control of the optically active material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a laser beam is directed into the multilayer glass panel to form a separation line through the first glass substrate, then the glass substrate can be separated along the separation line, but the electrode layer on the underlying second glass substrate is damaged and electrical conductivity is inhibited
Solution Approach 1:
The laser cutting process is segmented into multiple passes: a first pass forms initial separation defects in the first substrate, and a second pass completes the separation. This segmentation allows control over the cutting depth and prevents damage to the electrode layer on the second substrate, thereby maintaining electrical conductivity while achieving glass substrate separation.
Solution Approach 2:
The first laser pass creates preliminary separation defects and weakens the bond between substrates before the actual separation occurs. This preliminary action reduces the force needed for separation and prevents the laser from needing to cut through the entire multilayer structure, thus protecting the electrode layer on the second substrate from damage.
2Ease of operation
If the laser beam is directed to remove a portion of the first glass substrate to expose the second glass substrate for electrode connection, then electrode access is enabled, but the electrode layer on the second glass substrate is damaged below the separation line
Solution Approach 1:
The laser cutting process applies local quality by creating separation defects only in specific regions where glass removal is needed for electrode access. The cutting is localized to areas away from the electrode connection zones, preserving the electrode layer integrity in critical areas while still enabling adequate access for electrode connection.
3Device complexity
If mechanical scoring and breaking systems are used to cut glass substrates, then the cutting process is simple, but the precision and control over separation lines are insufficient for multilayer panels with electrode layers
Solution Approach 1:
The patent replaces mechanical scoring and breaking systems with a laser-based system that uses optical energy to create separation defects. This substitution enables precise control over separation line location and depth, allowing accurate separation of multilayer glass panels without damaging electrode layers, while maintaining reasonable process complexity through computer-controlled laser paths.
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 technique ensures the electrode layer remains undamaged and electrically conductive, enabling effective electrical control of the optically active material between the glass substrates, even after laser cutting, thereby maintaining the functionality of smart structures like privacy glazing.
Implementation Method 1
a laser beam may be directed into the multilayer glass panel to form a separation line where one region of glass is intended to be separated from another region of glass during the cutting process
Data Source
AI summary
A multilayer glass panel may be cut using a laser cutting technique. In some examples, the technique involves directing a laser beam into to panel to form a separation line. The separation line includes a plurality of spaced-apart defect columns extending at least partially through a first glass substrate but not through a second glass substrate. The plurality of spaced-apart defect columns each include a plurality of spaced-apart filamentation flaws. The example method can also involve separating a portion of the first glass substrate from the second glass substrate along the separation line to thereby configure the multilayer panel with a shelf defined by a portion of the second glass substrate extending outwardly from the separation line.