Etched Groove Passive Alignment for Optical Bench Manufacturing
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Solution Overview
Problem
The high labor costs associated with active alignment of optical components in MEMS devices, particularly due to the need for manual adjustment and the complexity of aligning hundreds of components, make passive alignment essential for large-scale manufacturing but require innovative solutions to reduce costs.
Innovation Solution
The use of etched grooves on an optical bench, specifically a tapered recess with a rear section, a tapered section, and a slot section, facilitates passive alignment of optical components by guiding them into precise positions, reducing the need for manual adjustment and minimizing misalignments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If active alignment is used to align optical components, then alignment precision is improved, but labor cost increases significantly
Solution Approach 1:
Alignment features (grooves, recesses, protrusions) are fabricated directly on the components and substrate before assembly. This preliminary structuring enables self-alignment during assembly, eliminating the need for costly manual active alignment while maintaining sub-micrometer precision
Solution Approach 2:
The alignment features on components and substrate work together to automatically guide and position components during assembly. The tapered groove geometry causes the component to self-align as it is inserted, reducing alignment to a simple insertion operation without requiring skilled manual adjustment
2Ease of manufacture
If passive alignment is used to reduce labor costs, then manufacturing efficiency is improved, but alignment precision may deteriorate
Solution Approach 1:
The alignment features have spatially varying geometries: the groove width varies along its length (tapered section), and different sections have different functions (reception vs. alignment). This local variation in geometry provides both the mechanical guidance for self-alignment and the precision positioning capability needed for sub-micrometer accuracy
Solution Approach 2:
The alignment features utilize asymmetric geometries where the groove width, depth, and profile are non-uniform. The tapered portion has a specific angle that guides the component at an optimal angle for self-alignment, while the reception portion has different dimensions to secure the component in its final precise position
3Manufacturing precision
If alignment features are fabricated on components and substrate, then alignment capability is improved, but device complexity increases
Solution Approach 1:
The alignment system is divided into separate functional features: grooves on the substrate, corresponding recesses and protrusions on components. These segmented features work together to provide alignment without requiring a complex integrated alignment mechanism, simplifying the overall device while maintaining precision
Data Source
AI summary
A system and method for facilitating passive alignment of an optical component in an optical bench. A groove is etched into the optical bench. The groove has two sections. The first section is configured to act as an optical guide. The second section is configured to receive the optical component. An optical component is inserted into the first section and moved into the second section. The optical component may be bonded to the optical bench.