Digital Exposure Mask for 3D Printing Hardening Control
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Solution Overview
Problem
Existing methods for producing three-dimensional objects by layer-by-layer solidification of radiation-sensitive materials face challenges such as inhomogeneous light intensity distribution, uneven hardening depth across different cross-sectional areas, and inadequate raw-body hardness, particularly for delicate structures, due to overexposure and the need for prolonged exposure times.
Innovation Solution
A method using a single digital exposure mask generated by a 2-bit bitmap, where each pixel is assigned a 'transparent' or 'non-transparent' bit-value, with exposure textures configured as patterns to control energy input, allowing for selective radiation projection and reducing exposure time, thereby achieving uniform hardening and improved structural stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single digital exposure mask with 2-bit bitmap is used for radiation projection, then exposure time is reduced and productivity is improved, but manufacturing precision may deteriorate due to limited transparency control levels
Solution Approach 1:
The exposure mask is segmented into two distinct transparency levels (first and second transparency values), creating a binary classification system for radiation transmission. This segmentation allows the system to process entire object layers with a single mask exposure, significantly reducing exposure time while maintaining sufficient control over hardening depth through the two discrete transparency states.
Solution Approach 2:
The patent changes the transparency parameter of mask regions to have only two distinct values, transforming the continuous transparency control into a discrete binary parameter. This parameter change enables faster processing by eliminating intermediate transparency levels, while the two remaining levels provide adequate differentiation for controlling hardening depth in different regions of the object layer.
2Manufacturing precision
If exposure time is prolonged to achieve adequate hardening of delicate structures, then manufacturing precision is improved, but productivity deteriorates due to increased production time
Solution Approach 1:
Different regions of the exposure mask are assigned different transparency values based on the local structural characteristics of the object layer. Delicate structures receive appropriate exposure through selectively transparent regions, ensuring adequate hardening quality, while the overall process remains efficient because the entire layer is exposed in a single operation rather than requiring prolonged or repeated exposure.
3Manufacturing precision
If grey value control or multiple masks are used to achieve even hardening depth, then manufacturing precision is improved, but device complexity and exposure time increase
Solution Approach 1:
The mask is segmented into regions with two distinct transparency values, providing sufficient differentiation for controlling hardening depth without requiring complex grey value control systems or multiple masks. This binary segmentation achieves even hardening depth across different cross-sectional areas while maintaining simple device architecture and single-mask operation.
4Manufacturing precision
If multiple exposure masks are used for a single object layer, then manufacturing precision is improved through controlled hardening, but productivity deteriorates due to prolonged exposure time
Solution Approach 1:
The single exposure mask is segmented into multiple regions with different transparency values (first and second transparency values), enabling pixel-accurate control of radiation transmission across the entire object layer in a single exposure operation. This eliminates the need for sequential multiple mask exposures, achieving precise hardening control while maintaining short exposure cycle time.
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 the production of three-dimensional objects with a single exposure mask, ensuring even hardening depth and improved stability across varying structure sizes, reducing overexposure issues and minimizing production time, while maintaining surface quality and dimensional accuracy.
Implementation Method 1
a material which is solidifiable under the action of radiation
Data Source
AI summary
A method for producing a three-dimensional object by layer by layer solidifying of a material which is solidifiable under the action of radiation is provided. The method makes use of exposure masks. In order to form each object layer to be solidified of the object in a construction plane, there is generated at least one, preferably a single, digital exposure mask by means of which the radiation is selectively projected into the construction plane. For each exposure mask, according to the object layer to be solidified, a single 2-bit bitmap is calculated which assigns either the bit-value “transparent” or the bit-value “non-transparent” to each pixel of the exposure mask. In addition, an improved exposure mask generating apparatus and an improved device for producing a three-dimensional object are proposed.