Resilient Vacuum Aperture Valve Sheet for Stable Substrate Hold-Down
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Solution Overview
Problem
Conventional printer systems face challenges in maintaining effective vacuum pressure across the substrate support surface due to uncovered vacuum apertures, leading to reduced substrate hold-down force and print quality issues, especially with irregular substrate shapes and sizes, and require complex and costly masking or ball valve solutions.
Innovation Solution
A sheet with integrated resilient valves that automatically open and close vacuum apertures based on substrate coverage, using a valve head and lever arm mechanism to maintain vacuum integrity without the need for external masking or complex ball valves, allowing for efficient and cost-effective operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a dense array of small vacuum apertures is used to hold down substrates of different shapes and sizes, then substrate hold-down force is improved, but vacuum pressure loss increases due to uncovered apertures
Solution Approach 1:
The valve automatically responds to substrate coverage by opening when covered and closing when uncovered, without external control. The valve head is pulled down by substrate weight to open the aperture, and springs return it to the closed position when uncovered, creating a self-regulating system that eliminates vacuum loss from uncovered apertures
Solution Approach 2:
The valve is pre-configured in a closed position with spring tension, and the substrate's weight automatically overcomes this tension to open the aperture only when needed. This preliminary positioning ensures the aperture is sealed by default, preventing vacuum loss before the substrate is even placed
2Loss of energy
If conventional masking is used to cover uncovered apertures, then vacuum pressure is maintained, but device complexity and operational time increase
Solution Approach 1:
Each aperture has an automatic valve that responds to substrate coverage without external intervention. The valve head moves with the substrate, and springs automatically return it to the closed position, eliminating the need for manual masking systems and their associated complexity
Solution Approach 2:
Instead of using a single masking system for the entire surface, the solution divides the vacuum surface into individual aperture units, each with its own independent valve. This segmentation allows each aperture to be controlled independently, eliminating the need for complex overall masking
3Loss of energy
If ball valves with springs are used to seal uncovered apertures, then vacuum integrity is maintained, but manufacturing cost and device complexity increase significantly
Solution Approach 1:
The valve head is made from flexible material that can deform to seal against the aperture. This flexible membrane approach replaces complex mechanical ball valves with springs, achieving the same sealing function with a simpler, more cost-effective structure
Solution Approach 2:
The valve head is designed to move dynamically with the substrate, flexing and deforming as needed to maintain the seal. This dynamic flexibility allows the simple valve structure to perform the same function as rigid, complex ball valve mechanisms
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
The solution ensures consistent vacuum pressure and improved print quality by automatically sealing uncovered apertures, reducing downtime and operational costs, and enabling efficient handling of various substrate sizes and shapes without the need for complex masking or ball valves.
Implementation Method 1
the sheet is made from a resilient material; and wherein each valve comprises a valve head for sealing a vacuum aperture... a valve lever arm for permitting movement of the valve head
Implementation Method 2
the substrate support surface can have an array of apertures connected to a source of negative air pressure... When the negative pressure is applied, air is drawn through the apertures in the printer table, and the negative pressure acts to hold the substrate to the surface
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A sheet (200) for an array of vacuum apertures (152) in a substrate support unit (150) of a printer is provided. The sheet (200) comprises a plurality of valves (202) formed into the sheet (200). The sheet (200) is made from a resilient material. Each valve (202) comprises a valve head (204) for sealing a vacuum aperture (152) in the substrate support unit (150), and a valve lever arm (206) for permitting movement of the valve head (204) towards and away from the vacuum aperture (152) in order to open and close the valve (202).