Alexandr B Shkolnik

7790093, Sep 7, 2010

May 9, 2005

11/126068

Alexandr Shkolnik - Los Angeles CA, US
Hendrik John - Hünxe, DE
Ali El-Siblani - Dearborn Heights MI, US

Envisiontec GmbH - Gladbeck

G02F 1/00

264401, 700120, 264497

The invention relates to a process or a device for the production of a three-dimensional object by layer-wise solidification of a material which is solidifiable under the application of electromagnetic irradiation by means of mask illumination, wherein the mask is produced using an image forming unit having a prescribed resolution, which is formed from a constant number of image forming elements (pixels) being discrete and being arranged in a spatially mutually fixed manner. For the improvement of the resolution along the outer and inner contours of the sectional areas of the object to be generated layer-wise in the sub-pixel range, a multiple illumination per layer is performed, which consists of a series of multiple images that are mutually shifted in the sub-pixel range in the image/construction plane, wherein a separate mask/bitmap is produced for each shifted image.

7845930, Dec 7, 2010

May 6, 2005

11/123973

Alexandr Shkolnik - Los Angeles CA, US
Hendrik John - Hünxe, DE
Ali El-Siblani - Dearborn Heights MI, US

Envisiontec GmbH - Gladbeck

B28B 1/16
B29C 35/08

425375, 425 89, 4251744, 425374, 264316, 264308, 264497, 264401

The invention relates to a process or a device for the production of a three-dimensional object by layer-wise solidification of a photo-polymerizable resin by means of a planar or essentially planar construction/reference plane, at which the photo-polymerizable resin contained in the liquid material is to be hardened by electromagnetic irradiation, and wherein the material application for the subsequent layer automatically results from the separation of the last hardened layer from the construction/-reference plane, whereby the construction/reference plane is formed by an elastic film. The film is fixed in a frame, and the height position of the frame with the film is adjusted in a basin containing the liquid material such that the pressure of the liquid material compensates the sagging of the film (formation of a negative meniscus), and that the lower side of the film is permanently in contact with the material during the whole construction process.

7892474, Feb 22, 2011

Nov 15, 2006

11/599769

Alexandr Shkolnik - Los Angeles CA, US
Ali El-Siblani - Dearborn Heights MI, US
Hendrik John - Hünxe, DE

Envisiontec GmbH - Gladbeck

B29C 35/08
B29C 41/02

264401

The invention describes a process and a device for producing at least one three-dimensional object, a photo-polymerizable material is solidified by means of simultaneous or almost simultaneous exposure of a build area or partial build area in a building plane via electromagnetic radiation, wherein a distance between a support plate, at which the object to be generated is built, and the building plane is changed during at least one exposure phase. It is possible according to the invention to solidify the three-dimensional object in a main direction during a radiation phase exceeding a current prescribed hardening depth, without interrupting supply of electromagnetic energy during the irradiation phase. Further, it is possible to control a current hardening depth of the photopolymerizable material during a building phase. Embodiments of suitable devices are also described.

7962238, Jun 14, 2011

Jul 30, 2010

12/847556

Alexandr Shkolnik - Los Angeles CA, US
Hendrik John - Hunxe, DE
Ali El-Siblani - Dearborn Heights MI, US

Envisiontec GmbH - Gladbeck

G06F 19/00

700119, 264401, 700118, 700124

The invention relates to a process or device for the production of a three-dimensional object by layer-wise solidification of a material which is solidifiable under the application of electromagnetic irradiation by means of mask illumination, wherein the mask is produced using an image forming unit having a prescribed resolution, which is formed from a constant number of image forming elements (pixels) being discrete and being arranged in a spatially mutually fixed manner. For the improvement of the resolution along the outer and inner contours of the sectional areas of the object to be generated layer-wise in the sub-pixel range, a multiple illumination per layer is performed, which consists of a series of multiple images that are mutually shifted in the sub-pixel range in the image/construction plane, wherein a separate mask/bitmap is produced for each shifted image.

8326024, Dec 4, 2012

Apr 14, 2009

12/423500

Alexandr Shkolnik - Los Angeles CA, US
Ali El-Siblani - Dearborn MI, US

Global Filtration Systems - Dearborn MI

G06K 9/00

382154, 264401, 264 401, 264140, 264494

A method and apparatus for making a three-dimensional object from a solidifiable material such as a photopolymer is shown and described. In accordance with the method, positions relative to a build axis are subdivided into first and second exposure data subsets, and the first and second exposure data subsets are solidified in alternating sequences to reduce the surface area of solidified material in contact with a solidification substrate.

RE43955, Feb 5, 2013

Sep 12, 2011

13/230270

Alexandr Shkolnik - Los Angeles CA, US
Hendrik John - Hunxe, DE

Envisiontec GmbH - Gladbeck

G02F 1/00

264401, 700120, 264497

The invention relates to a process or a device for the production of a three-dimensional object by layer-wise solidification of a material which is solidifiable under the application of electromagnetic irradiation by means of mask illumination, wherein the mask is produced using an image forming unit having a prescribed resolution, which is formed from a constant number of image forming elements (pixels) being discrete and being arranged in a spatially mutually fixed manner. For the improvement of the resolution along the outer and inner contours of the sectional areas of the object to be generated layer-wise in the sub-pixel range, a multiple illumination per layer is performed, which consists of a series of multiple images that are mutually shifted in the sub-pixel range in the image/construction plane, wherein a separate mask/bitmap is produced for each shifted image.

8372330, Feb 12, 2013

Oct 19, 2010

12/907853

Ali El-Siblani - Dearborn Heights MI, US
Alexandr Shkolnik - Los Angeles CA, US

Global Filtration Systems - Dearborn Heights MI

B29C 35/08

264401, 264 401, 264308, 264316, 264337

A solidification substrate assembly for making a three-dimensional object from a solidifiable material includes a solidification substrate assembly. In certain examples, the solidifiable material solidifies in contact with the solidification substrate, and the tilting of the substrate and/or or the use of a peeling member facilitates separation of the substrate from the solidified material. In other examples, the solidification substrate assembly includes a film that is adjacent to a rigid or semi-rigid layer. The solidifiable material solidifies in contact with the film, and a peeling member peels the film away from the solidified material. Intelligent solidification substrate assemblies are also described in which a force sensor determines when to expose the solidifiable material to solidification energy and/or whether to use a peeling member to separate the solidification substrate from a solidified objection section.

8394313, Mar 12, 2013

Nov 1, 2010

12/916818

Ali El-Siblani - Dearborn Heights MI, US
Alexandr Shkolnik - Los Angeles CA, US
Hendrik John - Hunxe, DE

Envisiontec GmbH - Gladbeck

B29C 35/08

264497, 264401, 264494, 4251744

The invention relates to a process or a device for the production of a three-dimensional object by layer-wise solidification of a photo-polymerizable resin by means of a planar or essentially planar construction/reference plane, at which the photo-polymerizable resin contained in the liquid material is to be hardened by electromagnetic irradiation, and wherein the material application for the subsequent layer automatically results from the separation of the last hardened layer from the construction/-reference plane, whereby the construction/reference plane is formed by an elastic film. The film is fixed in a frame, and the height position of the frame with the film is adjusted in a basin containing the liquid material such that the pressure of the liquid material compensates the sagging of the film (formation of a negative meniscus), and that the lower side of the film is permanently in contact with the material during the whole construction process.