Substrate Embossing Device with Segmented Vacuum Chamber
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Solution Overview
Problem
Existing substrate printing and embossing devices for semiconductor wafers face challenges in maintaining precise adjustment and contamination-free operation, especially when dealing with large substrate sizes and varying atmospheres, due to the need for large chamber volumes and complex sealing mechanisms.
Innovation Solution
The device allows for substrate adjustment outside the chamber, using a displaceable chamber design with a fluid bearing for precise movement and a separate working space that can be maintained under a defined atmosphere, minimizing chamber size and preventing contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the adjustment device is arranged inside the chamber to maintain a defined atmosphere, then the substrate can be adjusted in a controlled environment, but the chamber volume increases and the construction becomes less stable due to pressure differences
Solution Approach 1:
The device is divided into two separate chambers: a first chamber for the substrate with adjustment device and a second chamber for the stamp. This segmentation allows the adjustment device to operate in atmospheric conditions while the stamp chamber maintains the required vacuum or controlled atmosphere, resolving the contradiction between adjustment accessibility and chamber stability.
Solution Approach 2:
A fluid bearing acts as an intermediary between the substrate chamber and stamp chamber, enabling precise positioning of the substrate relative to the stamp without requiring the adjustment device to be inside the vacuum chamber. The fluid bearing transmits positional information and enables controlled movement while maintaining the seal between chambers.
2Manufacturing precision
If the chamber volume is increased to accommodate large adjustment devices, then precise substrate positioning is achieved, but the chamber requires thicker walls and more complex construction to withstand pressure differences
Solution Approach 1:
By separating the adjustment function into its own chamber, the system achieves precise substrate positioning without requiring a large vacuum chamber. The first chamber can be small and simple since it operates at atmospheric pressure, while the positioning precision is maintained through the coordinated operation with the second chamber.
Solution Approach 2:
The mechanical adjustment device operates outside the vacuum chamber, eliminating the need for complex mechanical systems inside the chamber. Only essential components (substrate holder, stamp holder) remain in the vacuum chamber, significantly reducing construction complexity while maintaining positioning precision through coordinated control.
3Ease of operation
If control lines for the adjustment device are routed through the chamber, then the adjustment device can be controlled, but sealing against the chamber becomes complex
Solution Approach 1:
By placing the adjustment device in a separate chamber, control lines only need to penetrate the first chamber wall, not the vacuum seal of the second chamber. This segmentation simplifies sealing requirements as the adjustment device chamber can use standard sealed enclosures while the vacuum chamber maintains its integrity.
4Manufacturing precision
If the chamber is designed to work with high precision under different atmospheres and pressures, then accurate printing/embossing is achieved, but the device becomes more complex and expensive
Solution Approach 1:
The device separates functions into two chambers: the first chamber handles substrate positioning in atmospheric conditions, and the second chamber maintains the required vacuum or controlled atmosphere for the stamping process. This segmentation allows each chamber to be optimized independently, reducing overall device complexity while maintaining high printing accuracy through coordinated operation.
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 solution enables precise and contamination-free substrate adjustment and printing/embossing with reduced chamber size and stable construction, maintaining a defined atmosphere and pressure within the working space, thus improving operational efficiency and reducing costs.
Implementation Method 1
a fluid bearing fed by at least one fluid supply line with fluid, in particular air, preferably clean air, being provided between the in particular trough-shaped receiving unit and the adjustment plate
Data Source
Figure 1
AI summary
The device has a tub-shaped retaining unit (5) retaining a substrate (7) i.e. wafer, in a working space (13). Adjusting devices (2-4) adjust the substrate opposite to an embossing die and/or ram (10). The retaining unit is formed separately from the space by the environment. The substrate and the ram are admittable with a defined atmosphere e.g. atmosphere under vacuum, in the separated working space. The space is formed by a structure (9) retaining the ram, an adjusting plate (8) and the retainer unit. A fluid bearing (20) is provided between the retaining unit and the plate.