Holo Limited

Other

Zero Nine Design, LLC

Richard Martin Greene

Brian James Adzima

Jonathan Pomeroy

Pierre Lin

Michael Daum

Ryan Michael Schmidt

R Benjamin Knapp

Arian Aghababaie

John Daniell Hebert

Carlo Quinonez

David Moore

Derek Loh

Stephen James Kranz

The present disclosure provides methods and systems for printing a three-dimensional (3D) object. The methods may comprise providing, adjacent to a build surface, a film comprising a polymeric precursor. A sensor may be used to determine a profile of the film. The profile may be indicative of a quality of the film. If the profile meets a quality threshold, at least a portion of the film may be exposed to light to initiate formation of a polymeric material from the polymeric precursor, thereby printing at least a portion of the 3D object.

Sensors for three-dimensional printing systems and methods

The present disclosure provides methods, systems, and apparatuses relating to hardware configurations for performing multi-wavelength three dimensional (3D) printing using photoinhibition. In at least one aspect, a system for 3D printing comprises a reservoir capable of holding a liquid including a photoactive resin, a build head that undergoes relative motion within the reservoir during 3D printing of a 3D object on the build head, a light projection device that projects a photoinitiation light beam at a first wavelength into a build area within the liquid, and a plurality of light sources arranged with respect to the light projection device and the reservoir that project a plurality of photoinhibiting light beams into the build area at a second wavelength. Each of the plurality of photoinhibition light beams may be projected at a peak intensity in a different respective position in the build area.

Multi wavelength stereolithography hardware configurations

Techniques and systems for enhancing vertical edges during photopolymer-based three-dimensional (3D) printing are described. A described technique includes accessing an original image corresponding to a slice of a 3D model prepared for printing on a 3D printer; accessing a pixel reduction factor that is associated with an increased exposure duration parameter; classifying pixels of the original image; reducing intensity levels of the interior pixels by the pixel reduction factor so that corresponding printing areas receive first curing doses under the increased exposure duration parameter and the reduced intensity levels that are comparable to doses received under an unmodified exposure duration parameter and unreduced intensity levels; maintaining intensity levels of the exterior pixels so that corresponding printing areas receive second curing doses under the increased exposure duration parameter that are greater than doses associated with the unmodified exposure duration parameter; and outputting a resulting modified image for 3D printing.

Enhanced three dimensional printing of vertical edges

Techniques and systems for 3D printing using mirrors that are oriented at about 45 degrees from an X-axis and Y-axis are described. A technique includes receiving an object model; rotating the object model about 45 degrees around the Z-axis; generating cross-sectional images of the rotated object model; mapping pixels of the cross-sectional images to corresponding mirrors of a digital micromirror device of an additive manufacturing apparatus to form additive-manufacturing images, wherein edges of the mirrors are oriented about 45 degrees from the X-axis of the digital micromirror device and about 45 degrees from the Y-axis of the digital micromirror; and providing the additive manufacturing images to generate a build piece corresponding to the object model. Other implementations can include corresponding systems, apparatus, and computer program products.

Stereolithography printer mapping a plurality of pixels of a cross-sectional image to corresponding mirrors of a plurality of mirrors of a digital micromirror unit

Techniques and systems for sub-pixel grayscale three-dimensional (3D) printing are described. A technique includes mapping a 3D digital model onto a 3D grid of voxels associated with a 3D printer; assigning a first intensity level to first voxels that are fully contained within the model, the first intensity level being sufficient to cure photoactive resin during a curing time; determining, based on geometric information provided by the model, containment degrees for second voxels that are partially contained within the model; assigning second intensity levels to the second voxels based respectively on the containment degrees, the second intensity levels being greater than a third intensity level and lesser than the first intensity level; assigning the third intensity level to third voxels that are outside of the model; and generating one or more graphic files based on the first, second, third voxels, and respectively assigned intensity levels.

Sub-pixel grayscale three-dimensional printing

Stereolithography printer

The invention provides a digital painting apparatus and method that captures the natural textures in physical painting tools. It is comprised of a plurality of sensors below a painting surface and a light source arranged such that reflective objects near the sensors are imaged, with the nearer parts of the objects forming brighter parts of those images. The images are thresholded to include only the parts of those objects nearest the painting surface and accumulated in a display buffer to leave painted strokes that preserve those textures as the objects are moved. A display is located below the painting surface, substantially coincident with the sensors, and feedback from the display is substantially removed from the sensor images before they are thresholded, providing more uniform sensitivity.

Method and apparatus for digital painting with natural textures

The invention provides a graphic input device which has uniform sensitivity and is free of keystone distortion but which is lighter and less expensive to manufacture than the prior art, particularly for large drawing surfaces. It uses Fresnel optics to reduce the cost, thickness, and weight of the prism or collimator or both. Means are provided to mitigate the effects of lens flare from the Fresnel optics, minimize the thickness of the device, and to correct any remaining distortion in the camera's image using software executing on a standard computer.

Low-cost graphic input device with uniform sensitivity and no keystone distortion

A lighting system adapted to mount on a motorcycle or bicycle helmet. The lighting system includes a one or more accelerometers coupled to the helmet and a processor adapted to process the signals from the accelerometers. The accelerometers may be mounted to the helmet, or the motorcycle or bicycle. The lighting system further includes a light mounted on the helmet that is responsive to the processed signal such that the light illuminates as result of a deceleration force. The system may also include filtering software to remove helmet motion artifact and other noise from the signal. Remote wheel speed indicators may also be used in conjunction with or in place of the accelerometers. Mounting tabs may also be included to releasably attach the lighting unit to the helmet.

Helmet lighting system

A computer graphic input device is disclosed for imaging the points of contact between objects and a surface. The input device is defined by a transparent material with one surface thereof defining a drawing surface. The index of refraction of the material is greater than the index of refraction of the medium on the upper side of the drawing surface. In the preferred embodiment, the transparent material is prism shaped in configuration. A camera is mounted on the lower side of the drawing surface in a manner to only capture light rays which have been totally internally reflected from the drawing surface. By this arrangement, objects located on the upper side of the drawing surface will be imaged by the camera only when and where the object is in direct contact with the drawing surface. The size and shape of the input pattern is digitized, processed and displayed on a monitor. The subject apparatus can be used to produce graphic effects achieved by various natural drawing implements, such as a brush.

Growing community of inventors

San Rafael, CA, United States of America

Richard Martin Greene