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公开(公告)号：US10746854B1
公开(公告)日：2020-08-18
申请号：US15853612
申请日：2017-12-22
Applicant: Facebook Technologies, LLC
Inventor： David Maurice Moore , Evan Paul Gander , Jason Victor Tsai , Zhaoming Zhu , Richard Andrew Newcombe , Renzo De Nardi , Nicholas Daniel Trail
Abstract: 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.
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公开(公告)号：US10860842B1
公开(公告)日：2020-12-08
申请号：US15853627
申请日：2017-12-22
Applicant: Facebook Technologies, LLC
Inventor： David Maurice Moore , Evan Paul Gander , Jason Victor Tsai , Zhaoming Zhu , Richard Andrew Newcombe , Renzo De Nardi , Nicholas Daniel Trail
Abstract: 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.
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公开(公告)号：US10859702B1
公开(公告)日：2020-12-08
申请号：US15853622
申请日：2017-12-22
Applicant: Facebook Technologies, LLC
Inventor： David Maurice Moore , Evan Paul Gander , Jason Victor Tsai , Zhaoming Zhu , Richard Andrew Newcombe , Renzo De Nardi , Nicholas Daniel Trail
Abstract: 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.
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