Device and method for producing a three-dimensional object by means of mask exposure

• US 8,126,580 B2
• Filed: 06/14/2010
• Issued: 02/28/2012
• Est. Priority Date: 04/28/2006
• Status: Active Grant

• Current Assignee: Envisiontec GmbH (Desktop Metal, Inc.)
• Original Assignee: Envisiontec GmbH (Desktop Metal, Inc.)
• Inventors: El-Siblani, Ali, Schillen, Volker, John, Hendrik
• Primary Examiner(s): Von Buhr, M. N.
• Application Number:
  US12/815,326
• Publication Number:
  US 20100249979A1
• Time in Patent Office: 624 Days
• Field of Search: 700 95- 98, 700117-121
• US Class Current: 700/98
• CPC Class Codes: B29C 64/129 characterised by the energy source therefor, e.g. by global irradiation combined with a mask
• CPC Class Codes: B33Y 10/00 Processes of additive manufacturing
• CPC Class Codes: B33Y 50/02 for controlling or regulating additive manufacturing processes
• CPC Class Codes: G03F 7/0037 Production of three-dimensional images
• CPC Class Codes: G03F 7/2022 Multi-step exposure, e.g. hybrid; backside exposure; blanket exposure, e.g. for image reversal; edge exposure, e.g. for edge bead removal; corrective exposure
• CPC Class Codes: G03F 7/70391 Addressable array sources specially adapted to produce patterns, e.g. addressable LED arrays

Abstract

Device for producing a three-dimensional object by solidification of a material solidifiable under the action of electromagnetic radiation by means of energy input via an imaging unit comprising a predetermined number of discrete imaging elements (pixels), said device comprising a computer unit, an IC and/or a software implementation respectively with the ability of adjusting and/or controlling the energy input via a specific gray value and/or color value in a voxel matrix.

Claims

1. A device for producing a three-dimensional object from a solidifiable material comprising:

an imaging unit comprising a predetermined number of discrete imaging elements;

an imaging unit controller configured to control the discrete imaging elements, wherein each of the discrete imaging elements corresponds to a location on an exposed surface of the solidifiable material and projects electromagnetic radiation based on a corresponding scaled intensity value onto the corresponding location on the exposed surface of the solidifiable material, and each scaled intensity value is based on a corresponding compensation light intensity value and a degree of overlap between the location on the exposed surface of the solidifiable material to which the scaled intensity value corresponds and a graphic depicting the three-dimensional object.

2. The device of claim 1, wherein the imaging unit controller receives data comprising a voxel matrix, and the voxel matrix includes the scaled intensity values corresponding to each location on the exposed surface of the solidifiable material.

3. The device of claim 1, wherein the imaging unit controller comprises at least one selected from the group consisting of a computer, an integrated circuit, and software.

4. The device of claim 1, wherein each corresponding compensation light intensity value is selected from the group consisting of a measured light intensity value and a light intensity value interpolated from measured light intensity values.

5. The device of claim 4, wherein each measured light intensity value is determined by measuring a light intensity at a selected location on an image surface, and each selected location on the image surface corresponds to a location on the exposed surface of the solidifiable material.

6. The device of claim 1, wherein the imaging unit controller projects electromagnetic radiation for a plurality of exposure times, each exposure time corresponds to one of a plurality of bitmaps, and each exposure time in the plurality of exposure times is the same.

7. The device of claim 1, wherein the graphic depicting the object defines first and second object areas, the scaled energy values for the first object area differ from the scaled energy values for the second object area, and the imaging unit projects electromagnetic radiation to a first set of locations on the exposed surface of the solidifiable material corresponding to the first object area and to a second set of locations on the exposed surface of the solidifiable material corresponding to the second object area such that the solidifiable material at the first set of locations is solidified to the same depth as the solidifiable material at the second set of locations.

8. The device of claim 1, wherein the exposed surface of the solidifiable material comprises a plurality of regions, each region includes a plurality of the locations on the exposed surface of the solidifiable material, and the compensation light intensity value within each region is constant across all of the locations within the region.

9. The device of claim 8, wherein the plurality of regions comprises a first subset of regions having a first exposed surface area and a second subset of regions having a second exposed surface area, the first exposed surface area is greater than the second exposed surface area, and the compensation light intensity value for the first subset of regions is greater than the compensation light intensity value for the second subset of regions.

10. The device of claim 1, wherein each compensation light intensity value corresponds to one of the locations on the exposed surface of the solidifiable material and one of the discrete imaging elements.

11. The device of claim 1, wherein the imaging unit is included in a projection unit.

12. The device of claim 1, wherein the imaging unit is a spatial light modulator.

13. The device of claim 1, wherein the scaled intensity value is selected from the group consisting of a gray scale value and a color value.

14. A method of producing a three-dimensional object from a solidifiable material, comprising:

projecting electromagnetic radiation to each location in a plurality of locations on an exposed surface of the solidifiable material based on a scaled intensity value corresponding to the location, wherein each scaled intensity value is based on a corresponding compensation light intensity value and a degree of overlap between the location on the exposed surface of the solidifiable material to which the scaled intensity value corresponds and a graphic depicting the three-dimensional object.

15. The method of claim 14, wherein each corresponding light intensity value is selected from the group consisting of a measured light intensity value and a light intensity value interpolated from measured light intensity values.

16. The method of claim 15, further comprising measuring a plurality of light intensity values at selected locations on an image surface to obtain the measured light intensity values, wherein each location on the image surface corresponds to a location on the surface of the solidifiable material.

17. The method of claim 16, further comprising interpolating between the measured light intensity values to obtain the interpolated light intensity values.

18. The method of claim 15, wherein each measured light intensity value is determined by measuring a light intensity at a selected location on an image surface, and each selected location on the image surface corresponds to a location on the exposed surface of the solidifiable material.

19. The method of claim 14, wherein the imaging unit controller projects electromagnetic radiation for a plurality of exposure times, wherein each exposure time corresponds to one of a plurality of bitmaps, and each exposure time is the same.

20. The method of claim 14, wherein the graphic depicting the object defines first and second object areas, the scaled energy values for the first object area differ from the scaled energy values for the second object area, and the imaging unit projects electromagnetic radiation to a first set of locations on the exposed surface of the solidifiable material corresponding to the first object area and to a second set of locations on the exposed surface of the solidifiable material corresponding to the second object area such that the solidifiable material at the first set of locations is solidified to the same depth as the solidifiable material at the second set of locations.