Vacuum Coating of Flexible Lattice Substrates via Multi-Layer Transport
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Solution Overview
Problem
Existing methods for processing flexible, matrix- or lattice-shaped substrates are inefficient, leading to unreliable and uneven coating processes due to the high proportion of free volume and sparse surface area, which complicates effective process control and quality consistency in vacuum coating systems.
Innovation Solution
A method involving multiple layers of the substrate being transported in close proximity through a vacuum processing system's usable flux, with deflection rollers and processing instruments arranged to maximize exposure to the coating field, allowing for uniform processing and filling of voids with additional materials, while maintaining the structural integrity of the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If flexible substrates with high free volume are processed in vacuum coating systems, then the substrate structure is maintained, but coating uniformity and process control reliability deteriorate due to sparse surface area
Solution Approach 1:
The patent transitions from processing a single substrate layer to processing multiple substrate layers stacked in close proximity. By arranging multiple layers in the vertical dimension (stacked configuration), the system increases the total surface area exposed to the coating flux while maintaining the vacuum environment and substrate structure integrity. This dimensional approach allows the coating process to effectively cover the sparse surface areas of individual layers through repeated exposure.
Solution Approach 2:
The patent implements continuous processing by transporting multiple substrate layers through the vacuum coating field in a stacked configuration. The substrate stack moves continuously through the processing field, allowing the coating flux to act on all layers simultaneously and continuously. This continuous action ensures uniform coating distribution across all layers and maintains process control reliability throughout the coating process.
2Productivity
If multiple substrate layers are transported in close proximity through the processing field, then coating surface area and material deposition probability increase, but system complexity increases due to deflection rollers and transport control
Solution Approach 1:
The deflection rollers serve multiple functions: they guide the substrate stack through the processing field, maintain the stacked configuration of layers, control the transport direction, and ensure proper spacing between layers. By making the transport system multi-functional, the patent reduces the need for additional separate components, thereby managing system complexity while achieving high coating efficiency through multiple layers processed simultaneously.
3Ease of operation
If the substrate is moved through the evacuable process area, then processing can be performed, but pressure equalization and gas exchange between modules occur
Solution Approach 1:
The patent introduces lock chambers as intermediary components between different modules of the vacuum processing system. These lock chambers act as barriers that prevent direct pressure equalization and gas exchange between adjacent modules while still allowing the substrate to pass through. The lock chambers maintain separate vacuum environments in different modules, ensuring reliable pressure control while enabling continuous substrate processing through the evacuable process area.
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 approach enables reliable and uniform coating of flexible substrates, effectively utilizing the available flux to cover more surface area and fill voids, improving processing efficiency and quality by increasing the probability of layer overlap and material deposition within the processing field.
Implementation Method 1
a flexible substrate for processing with a processing instrument is moved through an evacuable process area of a vacuum processing system
Data Source
AI summary
Processing a flexible substrate of a matrix-shaped or lattice-shaped construction material. A first layer thereof is transported in a first transport direction, and a second layer thereof is transported in parallel with and closely spaced apart from the first layer in an opposite, second transport direction through a free region in the evacuable process area. A usable flux of a processing instrument penetrates the first and the second layer of the flexible substrate simultaneously while transported through the free region in an opposite direction. Also, a vacuum processing system including two roller groups, each group including smaller and larger rollers deflecting the flexible substrate. The free region including a processing instrument arranged between the roller groups through which the flexible substrate is transported in an opposite direction and without directional change. At least two closely spaced apart layers of the flexible substrate are transported in opposite directions.