Oblique Surface Formation via Vacuum-Curved Diaphragms
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Solution Overview
Problem
Current methods for producing oblique surfaces in semiconductor processing are inefficient and not economical for large-scale production, lacking the precision and variability needed for micromechanical elements like micromirrors.
Innovation Solution
The method involves creating recesses on both sides of a substrate until they perforate, then attaching flexible diaphragms that curve under vacuum pressure to form oblique surfaces, allowing for precise control of inclination, height, and curvature, and using materials like borosilicate glass for transparency and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional oblique etching processes are used to produce oblique surfaces, then oblique planes can be formed, but the process is complex and not suitable for large-scale production
Solution Approach 1:
The substrate is divided into multiple recesses that can be independently formed and filled, allowing parallel processing of multiple oblique surfaces simultaneously. This segmentation enables high-volume production while maintaining precision through standardized recess geometries
Solution Approach 2:
The inclination angle and depth of oblique surfaces are controlled by varying the etching parameters (depth, shape) of the recesses rather than using complex etching processes. By changing the geometric parameters of the recess, different oblique surface configurations can be produced efficiently
2Manufacturing precision
If photoresist layers are heated to form oblique edges for etching, then oblique surfaces can be produced, but the process requires high temperature and multiple steps reducing productivity
Solution Approach 1:
The recesses are pre-formed in the substrate before the oblique surfaces are created. This preliminary structuring allows subsequent filling operations to directly produce the oblique surfaces without requiring high-temperature photoresist flow or multiple etching steps, significantly reducing process time
Solution Approach 2:
The thermal-mechanical process of heating photoresist to form oblique edges is replaced by a direct geometric approach where recess shapes define the oblique surfaces. This substitution eliminates high-temperature processing and reduces the number of process steps
3Reliability
If pre-formed coverings with oblique surfaces are placed over micromirror arrays, then oblique surfaces can be provided, but the method lacks flexibility in dimensions and integration with planar technology
Solution Approach 1:
The recess structure serves multiple functions: it defines the oblique surface geometry, provides mechanical support, and enables integration with planar fabrication processes. The same recess fabrication approach can produce various oblique surface configurations by adjusting etching parameters
Solution Approach 2:
Instead of placing pre-formed three-dimensional coverings, the solution creates oblique surfaces by modifying the substrate geometry in a controlled manner through recess formation. This dimensional approach allows precise control over inclination angles and heights while maintaining compatibility with planar technology
4Manufacturing precision
If masking layers are used with high etching selectivity to reduce abrasion, then substrate damage is reduced, but the masking layers must be precisely controlled adding process complexity
Solution Approach 1:
The complex masking process is extracted and replaced by directly forming recesses in the substrate that inherently define the oblique surface boundaries. The recess walls themselves serve as the boundaries for filling operations, eliminating the need for separate masking layers and reducing process complexity
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 efficient, precise, and flexible production of oblique surfaces compatible with planar technology, suitable for large-scale production, and effectively reduces scattered and reflected radiation in micromechanical elements by creating smooth, flat, and transparent oblique windows.
Implementation Method 1
If a vacuum pressure is then built up inside the recesses relative to the external pressure, the flexible diaphragms each curve in the direction of the recesses
Data Source
AI summary
A method for producing oblique surfaces in a substrate, comprising a formation of recesses on both surfaces of the substrate, until the recesses are so deep that the substrate is perforated by the two recesses. One recess is produced going out from a first main surface in the region of a first surface, and the other recess is produced going out from the second main surface in the region of a second surface, so that the first surface and the second surface do not coincide along a surface normal of the main surfaces of the substrate. Subsequently, flexible diaphragms are attached over the recesses on each of the main surfaces. If a vacuum pressure is then produced inside the recesses, the flexible diaphragms each curve in the direction of the recesses until their surfaces facing the substrate come into contact with one another, generally in the center of the recesses.