Curved Substrate Lithography Additive Manufacturing
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Solution Overview
Problem
Existing lithography-based additive manufacturing techniques face challenges in achieving high accuracy and stability when printing on curved surfaces, due to limitations in resin layer thickness control, feature resolution, and the need for large resin vats, which can lead to chemical instability and process inefficiencies.
Innovation Solution
A device and method for lithography-based additive manufacturing that includes a carrier element for curved substrates, a light engine for dynamic patterning, and a material transport unit with drive means for rotational movement and slip-free contact, allowing for precise 3D printing on large curved surfaces with controlled exposure times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If large resin vats are used to enable large building areas, then printing area is improved, but manufacturing precision deteriorates due to accuracy shifts between center and edge
Solution Approach 1:
The patent divides the large building area into multiple smaller resin vats arranged in an array. Each vat is independently controlled and maintains high manufacturing precision. The system selectively activates only the vats needed for the current printing task, avoiding the accuracy degradation that occurs in the center and edge regions of large single vats.
Solution Approach 2:
The patent implements dynamic control of resin vat activation and deactivation based on the current printing requirements. The system can selectively enable or disable individual vats in the array, allowing optimal precision for each active vat while maintaining the capability for large overall building areas through coordinated multi-vat operation.
2Ease of manufacture
If submerged printing on flat surfaces is used, then manufacturing simplicity is improved, but adaptability deteriorates when printing on curved surfaces
Solution Approach 1:
The patent replaces the traditional flat building platform with a curved or spherical substrate that can be rotated. The resin vats are positioned to contact the curved surface at specific points, enabling additive manufacturing on curved geometries while maintaining process simplicity through automated rotation and selective vat activation.
Solution Approach 2:
The patent introduces rotational movement as an additional degree of freedom, allowing the substrate to rotate and present different curved surfaces to the array of resin vats. This transforms the printing process from limited flat-surface operation to three-dimensional curved surface capability while maintaining manufacturing simplicity.
3Productivity
If photopolymer resin is stored in large quantities for vat filling, then productivity is improved for large builds, but reliability deteriorates due to chemical instability
Solution Approach 1:
The patent divides the resin storage system into multiple separate, smaller resin vats rather than using one large vat. Each vat contains a manageable quantity of photopolymer resin that maintains chemical stability. The system can selectively fill and use individual vats as needed, avoiding the resin stability issues that arise from storing large quantities in a single large vat.
Solution Approach 2:
The patent implements a system where resin vats can be individually depleted, replaced, or refreshed without affecting the entire system. When a resin vat is depleted or degraded, it can be independently replaced with a fresh vat, ensuring continuous reliable operation while maintaining the capability for large-scale production through the array of vats.
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
Enables precise and stable additive manufacturing on curved surfaces with high printing accuracy, flexibility in photopolymer resin composition, and improved thermo-mechanical properties, overcoming limitations of existing technologies.
Implementation Method 1
Different light sources are typically used in order to induce photopolymerization of the liquid photopolymer resin layer
Data Source
AI summary
A device for the lithography-based additive manufacturing of three-dimensional structures on a substrate, comprises a carrier element for carrying a substrate having a curved surface, a light engine designed for the dynamic patterning of light in an exposure field of said light engine, a material transport unit comprising a first drive means for transporting a material layer across the exposure field, second drive means for causing rotational movement of the substrate having the curved surface such as to establish a rolling contact of the curved surface on the material layer in a contact zone, said contact zone being arranged in the exposure field, and first control means configured to control said first and/or second drive means so that said rolling contact of the curved surface on the material layer is essentially slip-free.