Facebook Technologies, LLC

Evan Gander

Richard Andrew Newcombe

Renzo De Nardi

Nicholas Daniel Trail

Zhaoming Zhu

Jason Victor Tsai

David Maurice Moore

Alexander Jobe Fix

Sebastian Sztuk

Raymond King

Javier San Agustin Lopez

Kirk Erik Burgess

Thomas Scott Murdison

Scott Robert Ramsby

Robert Y Wang

Andrew Wyman MacDonald

Mohammadhossein Daraeihajitooei

Mohamed Hegazy

Dmitri Model

Beipeng Mu

A disclosed apparatus may include a line source configured to produce a line of light and a scanning device configured to scan the line of light across a scanning field in a scanning direction. The scanning field may include a receiving portion configured to receive an eye. The apparatus may also include a reflector positioned within the scanning field. During a primary period of a scan, the line of light may scan the receiving portion in a primary direction. During a secondary period of the scan, the reflector may reflect the line of light such that a reflection of the line of light scans the receiving portion in a secondary direction. The apparatus may also include a photodetector positioned to receive (1) an initial reflection during the primary period, and (2) a subsequent reflection during the secondary period. Various other methods, apparatuses, and computer-readable media are also disclosed.

Apparatuses, systems, and methods for scanning an eye via a folding mirror

A system includes at least two base stations that emit light beams to illuminate an area for positional tracking objects in the area. A base station emits at least two light beams that rotate around a rotation axis at a rotational speed unique to the base station. Responsive to being illuminated by the light beams emitted by the at least two base stations, an object being tracked generates illumination data. The system determines which illumination data corresponds to one of multiple base stations by analyzing the illumination data over time. The system analyzes the illumination data corresponding to one base station to determine an orientation and/or position of the object relative to that base station.

Positional tracking using multiple base stations

Systems described herein use outside-in positional tracking. A base station emits one or more rotational light beams to illuminate a local area. The rotational light beams rotate around a rotation axis and are used for positional tracking one or more objects in the local area. The one or more rotational light beams retroreflect from the one or more objects in the local area. The one or more objects include retroreflectors that retroreflect light beams incident on them. The base station detects the retroreflected light beams. The base station generates illumination data in response to the detected light beams. A system analyzes the illumination to determine an orientation and/or a location of an object.

Positional tracking using retroreflectors

Systems described herein use outside-in positional tracking. A base station emits one or more rotational light beams to illuminate a local area. The rotational light beams rotate around a rotation axis and are used for positional tracking of one or more objects in the local area. A beam waist of a source light beam for generating the rotational light beams is positioned to be within a distance range from a center of rotation of the rotational light beams. An apparent frequency of the particular rotational light beam can be constant or substantially constant throughout a local area. Because the apparent frequency of the particular rotational light beam is constant or substantially constant throughout the local area, the frequency response of a detector in response to the illumination by the rotational light beam is within a limited range of values irrespective of the detector's location within the local area.

Positional tracking using light beams with constant apparent frequencies

A system includes a wearable device including sensors arranged at different locations on the wearable device. Each sensor measures electrical signals transmitted from a wrist or arm of a user. A position computation circuit is coupled to the sensors. The position computation circuit computes, using information derived from the electrical signals with a machine learning model, an output that describes a hand position of a hand of the wrist or arm of the user.

Armband for tracking hand motion using electrical impedance measurement

Growing community of inventors

Seattle, WA, United States of America

Evan Gander