D4d Technologies, LLC

Other

Gridview Optical Solutions, Llc.

Grant E Kenworthy

Rod A Duncan

Mark S Quadling

Henley S Quadling

Ye Li

Justin G Graham

Philip B Davis

Glen Freeman

Edward B Condon

Lasse H Toimela

Greg R Basile

Stephen Michael Prince

Andrei Tchouprakov

Gregory R Basile

George R Kline

An intra-oral scanning device includes a light source and an optical system, and communicates with a display system. The device provides for more efficient transmission and capture of images. It integrates OCT scanning with RGB-based scanning. In operation, the device is used for recording topological characteristics of teeth, dental impressions, or stone models by digital methods and for use in CAD/CAM of dental restorative prosthetic devices. To that end, the RGB-based scan obtains surface data (e.g., a margin), while the OCT scan penetrates the surface. The two scanners operate from within the same physical housing and preferably at the same time such that only one scanning pass (to obtain all necessary data) is required. The 3D data obtained from the OCT scan is registered with the 3D data obtained from the RGB-based scan by virtue of being captured using a common return path. Preferably, the 3D surface data is used to align the volume data, such that the OCT scan operates over a much sparser scanning volume than would otherwise be required if the OCT scan were carried out separately. In this manner, there is less stitching of data required to build the output images, thereby enabling a 'one-pass' operation.

Intra-oral scanning device with integrated optical coherence tomography (OCT)

An intra-oral scanning device includes a light source and an optical system, and communicates with a display system. The device has a reduced form factor as compared to prior devices, and it provides for more efficient transmission and capture of images.

Intra-oral scanning device

Handheld scanner tip

Handheld scanner

A stress control apparatus for managing effects caused by electrical stress in a high voltage environment, and methods of manufacturing the apparatus. A dielectric tube with a central bore coated with a conductive material has an outer conductive coating on a lower section that is grounded. The central bore carries a high voltage potential from a current-carrying conductor. The grounded coating transitions to the exposed outer dielectric surface along a gradually tapered transition. A conductive insert connects to the central bore and forms an electric field in a space between the insert and the grounded coating. When coated with an epoxy and inserted into the central bore, the insert forms a small gap between an outer surface of the insert and part of the central bore, such that there is no zero potential difference in the gap. Any epoxy that oozes out during insertion will collect in the gap.

Stress control assembly and methods of making the same

Structure is provided for controlling the electrical stress on one or more optical fibers in a high voltage environment.

Stress control structure for optical fibers in a high voltage environment

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Allen, TX, United States of America

Grant E Kenworthy