The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 18, 2020
Filed:
Dec. 22, 2017
Facebook Technologies, Llc, Menlo Park, CA (US);
David Maurice Moore, Redmond, WA (US);
Evan Paul Gander, Seattle, WA (US);
Jason Victor Tsai, Bellevue, WA (US);
Zhaoming Zhu, Redmond, WA (US);
Richard Andrew Newcombe, Seattle, WA (US);
Renzo De Nardi, Seattle, WA (US);
Nicholas Daniel Trail, Bothell, WA (US);
Facebook Technologies, LLC, Menlo Park, CA (US);
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.