Imaging Assembly for Sintering with Thermal Management
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Solution Overview
Problem
Existing 3D printing systems require high-powered lasers and precise motion systems, making them costly and inefficient for home/hobbyist users or small mechanical design groups, and face issues with optical components overheating and material accumulation that reduces light transmission during the sintering process.
Innovation Solution
An imaging assembly using a tungsten halogen lamp with a heat sink and forced air cooling, combined with a reflector, condenser lenses, and achromatic doublet lenses, maintains optical components at safe temperatures and prevents material accumulation, allowing for focused light generation without expensive cooling systems or high-temperature optics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-powered lasers and high precision motion systems are used for 3D printing, then manufacturing precision and reliability are improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent extracts the high-precision motion system from the 3D printing process by using a stationary imaging assembly that projects patterns directly onto the powder bed. This eliminates the need for complex moving mirrors and precision positioning mechanisms while maintaining printing accuracy through optical projection methods.
Solution Approach 2:
The patent replaces the mechanical motion system with an optical projection system. Instead of physically moving components to create 3D structures, the system uses light projection and optical patterns to define and build layers, substituting mechanical complexity with optical simplicity.
2Manufacturing precision
If optics are located near the sintering surface to enable focused light generation, then manufacturing precision is improved, but optical components overheat and light transmission is reduced due to material accumulation
Solution Approach 1:
The patent segments the imaging assembly into multiple optical components (reflector, condenser lenses, achromatic doublet lenses) arranged in a thermal gradient. Each component is positioned at a different distance from the sintering zone, with cooling channels strategically placed between components to manage heat distribution and prevent overheating while maintaining precise light focus.
Solution Approach 2:
The patent introduces forced air cooling as an intermediary thermal management system. Air is circulated through channels between optical components, acting as a heat transfer medium that carries excess heat away from the optics without requiring direct thermal contact or complex active cooling systems, thus maintaining optical integrity near the sintering surface.
3Ease of manufacture
If standard optical components are used in the high-temperature sintering environment, then ease of manufacture is improved, but reliability decreases due to overheating and material accumulation
Solution Approach 1:
The patent changes the thermal parameters of the optical assembly by introducing forced air cooling and thermal management structures. This allows standard optical components to operate in a controlled temperature environment despite being located near the high-temperature sintering zone, preventing overheating and material accumulation while maintaining ease of manufacture with commercially available optics.
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 enables cost-effective 3D printing by maintaining optical component integrity and preventing material accumulation, ensuring efficient light transmission and effective sintering without the need for expensive cooling systems or high-temperature optics.
Implementation Method 1
The heat sink may be exposed to a stream of forced air to maintain the operational temperature
Implementation Method 2
The reflector reflects the light from the filament back toward the filament and onto the object plane
Implementation Method 3
The aperture may include a mechanical shuttering system for adjusting said focused light beam
Implementation Method 4
A set of achromatic doublet lenses, each achromatic doublet lens comprising three surfaces, focuses light over a range including the three wavelengths
Implementation Method 5
The prior art 3D printing systems that make use of heat to join the materials together
Implementation Method 6
an incoherent energy source whose energy is focused to provide a small area of concentrated heat to generate layer-by-layer 3D printing
Data Source
AI summary
A imaging assembly for generating a light beam suitable for sintering comprises a lamp housing and a lamp mounted in the lamp housing comprising a filament and a lamp base, wherein the lamp is oriented with the lamp base to the side of the filament. The imaging assembly further comprises a reflector, an aperture, and at least one condenser lens configured to focus light emitted by the filament through the aperture. The imaging assembly further comprises a set of achromatic doublet lenses, each achromatic doublet lens comprising three surfaces optimized to focus light at three wavelengths, wherein the set of achromatic doublet lenses focuses light over a range including the three wavelengths. The imaging assembly further comprises an outer lens, wherein the focused light beam exits the imaging assembly through the outer lens.