Moving Optical Head for Large-Volume 3D Printing
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Solution Overview
Problem
Current three-dimensional modeling techniques using Selective Laser Sintering (SLS) face limitations in producing large-scale objects due to high manufacturing costs and reduced productivity, primarily because of the need for multiple optical heads or high-powered optical heads, which increase costs and slow down the process with prolonged material layer formation and light beam irradiation times.
Innovation Solution
A three-dimensional modeling apparatus that incorporates a diffractive optical modulator with linearly arranged modulation elements, a projection optical system, and a head moving mechanism allowing continuous movement of the optical head in the direction parallel to the material layer, enabling efficient formation of material layers and light irradiation, with the option to start forming the next layer before finishing irradiation on the previous one, and reversible head movement to enhance productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple optical heads or high-powered optical heads are provided to increase scanning area, then the modeled object size can be increased, but the manufacturing cost increases significantly
Solution Approach 1:
The patent transitions from a stationary optical head to a moving optical head that travels along the scanning area. By adding the dimension of motion, a single optical head can cover a large scanning area that would otherwise require multiple stationary heads, thus reducing manufacturing cost while maintaining the ability to model large objects.
Solution Approach 2:
The optical head is made dynamic by introducing a moving mechanism that allows it to traverse the scanning area. This dynamic approach replaces the static multiple optical heads configuration, reducing system complexity and cost while achieving the same coverage area through motion rather than through multiple fixed positions.
2Volume of moving object
If the scanning area of the light beam is widened to increase modeled object size, then productivity is significantly reduced due to prolonged processing time
Solution Approach 1:
The moving optical head enables continuous scanning across the material layer without interruption. The head moves continuously in the scanning direction while projecting light, eliminating idle time between scanning segments. This continuous action maintains productivity while accommodating larger scanning areas that would otherwise require multiple sequential operations.
Solution Approach 2:
The system performs preliminary heating of the material layer before the optical head arrives at each scanning position. This preliminary action ensures the material is ready for immediate processing when the head arrives, eliminating waiting time and maintaining continuous productive action throughout the scanning process, thus preserving productivity while enabling larger scan areas.
3Device complexity
If a single optical head is used to reduce manufacturing cost, then the scanning area is limited, but implementing a moving mechanism increases device complexity
Solution Approach 1:
The moving optical head serves multiple functions: it acts as both the light source and the scanning mechanism. By combining the optical head with the moving mechanism, the system achieves multi-functionality where a single component performs both illumination and positioning tasks that would otherwise require separate systems, thus avoiding the cost of multiple optical heads while expanding the scanning area.
4Productivity
If material layer formation time is reduced to increase productivity, then the thermal stabilization time is insufficient, affecting modeling precision
Solution Approach 1:
The system performs preliminary heating of the material layer before the optical head begins scanning. This preliminary action initiates the thermal stabilization process in advance, ensuring that when the optical head arrives and begins processing, the material is already at the appropriate temperature. This allows for faster layer formation speeds while maintaining sufficient thermal stabilization for precise modeling.
Solution Approach 2:
The system dynamically adjusts the timing between material layer formation and optical head arrival. By coordinating the movement speed of the optical head with the heating process, the system optimizes the timeline to ensure thermal stabilization is achieved just in time for processing. This dynamic coordination enables faster productivity without compromising the thermal stabilization required for manufacturing precision.
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 allows for the creation of large-scale modeled objects while reducing manufacturing costs and increasing productivity by concurrently moving the optical head and forming material layers, thus reducing overall processing time and maintaining high accuracy.
Implementation Method 1
a diffractive optical modulator having a plurality of modulation elements which are linearly arranged
Implementation Method 2
a projection optical system for forming a projection image of the optical modulator on the material layer
Implementation Method 3
a light source, a diffractive optical modulator having a plurality of modulation elements which are linearly arranged, an illumination optical system for guiding light emitted from the light source to the optical modulator
Implementation Method 4
by changing an orientation of a mirror
Implementation Method 5
a head moving mechanism for moving the optical head in a head moving direction parallel to the material layer
Data Source
AI summary
A three-dimensional modeling apparatus (1) includes a layer formation mechanism (12) for forming a material layer in a modeling space (30), an optical head (11) for irradiating the material layer with light, and a head moving mechanism (13) for moving the optical head (11) in a head moving direction parallel to the material layer. The optical head (11) includes a light source, a diffractive optical modulator having a plurality of modulation elements which are linearly arranged, an illumination optical system for guiding light emitted from the light source to the optical modulator, and a projection optical system for forming a projection image of the optical modulator on the material layer and moving the projection image in a scan direction (+X) crossing a direction corresponding to an arrangement direction of the plurality of modulation elements and crossing the head moving direction (+Y) by changing an orientation of a mirror.