Three-dimensional printing method using increased light intensity and apparatus therefor
A method of forming a three-dimensional object includes: providing a carrier and an optically transparent member having a build surface, the carrier and the build surface defining a build region therebetween; filling the build region with a polymerizable liquid, irradiating the build region with light through the optically transparent member to form a solid polymer from the polymerizable liquid, and advancing said carrier away from said build surface to form said three-dimensional object from said solid polymer. The irradiating step includes projecting focused light at the build region, and the advancing step is carried out at a rate that is dependent on an average light intensity of the focused light. An apparatus to perform the method is also disclosed.
1. An apparatus for forming a three-dimensional object from a polyerizable liquid, comprising:
(a) a support;
(b) a carrier operatively associated with said support on which carrier said three-dimensional object is formed;
(c) an optically transparent member having a build surface, with said build surface and said carrier defining a build region therebetween;
(d) a liquid polymer supply operatively associated with said build surface and configured to supply liquid polymer into said build region for solidification or polymerization;
(e) a light engine configured to irradiate said build region with light through said optically transparent member to form a solid polymer from said polymerizable liquid;
(f) at least one controller operatively associated with said light engine for projecting focused light at said build region, said at least one controller also operatively associated with said carrier for advancing said carrier upwardly away from the build surface at a rate that is dependent on an average light intensity of said focused light to form said three-dimensional object from said solid polymer,
wherein said carrier has at least one channel formed therein, said at least one channel in fluid communication with said liquid polymer supply to supply liquid polymer through said carrier and into said build region for solidification or polymerization.
2. The apparatus of claim 1 , wherein said light engine is configured to irradiate said build region with UV light through said optically transparent member to form a solid polymer from said polymerizable liquid.
3. The apparatus of claim 1 , wherein said light engine comprises an LED light source.
4. The apparatus of claim 3 , further comprising a band pass filter to project 375±15 nm light at Full Width at Half Maximum (FWHM) at said build region.
5. The apparatus of claim 1 , wherein said light engine comprises an objective lens to focus said light.
6. The apparatus of claim 1 , wherein said build surface is substantially fixed or stationary.
7. The apparatus of claim 1 , further comprising a heater operatively associated with said build surface and/or said liquid polymer supply, said heater and configured to heat polymerizable liquid in or supplied to said build region.
8. The apparatus of claim 1 , further comprising a pressure source operatively associated with said liquid polymer supply.
9. The apparatus of claim 1 , further comprising a drive operatively associated with said carrier.
10. The apparatus of claim 9 , wherein said drive and said controller are configured to advance said carrier unidirectionally away from said build surface.
11. The apparatus of claim 9 , wherein said drive and said controller are configured to reciprocate said carrier with respect to said build surface to enhance or speed the refilling of said build region with said polymerizable liquid.
12. The apparatus of claim 1 , wherein said carrier has a soluble sacrificial layer thereon, and said three-dimensional object is formed on said soluble sacrificial layer.