US 11,855,705 B2
Distributed optical resonator with thin receiver unit
Ortal Alpert, Ness Ziona (IL); Yoni Cohen, Jerusalem (IL); Ori Refael Mor, Tel Aviv (IL); Omer Nahmias, Aminadav (IL); Eitan Ronen, Rehovot (IL); and Lior Golan, Ramat Gan (IL)
Assigned to Wi-Charge Ltd., Rehovot (IL)
Filed by Wi-Charge Ltd., Rehovot (IL)
Filed on Mar. 17, 2021, as Appl. No. 17/203,886.
Application 17/203,886 is a continuation of application No. 16/658,292, filed on Oct. 21, 2019, granted, now 10,958,357.
Application 16/658,292 is a continuation of application No. 15/548,175, granted, now 10,454,593, issued on Oct. 22, 2019, previously published as PCT/IL2016/050120, filed on Feb. 2, 2016.
Claims priority of provisional application 62/125,829, filed on Feb. 2, 2015.
Prior Publication US 2021/0211206 A1, Jul. 8, 2021
Int. Cl. H04B 10/80 (2013.01); H01S 3/08 (2023.01); H04B 10/69 (2013.01)
CPC H04B 10/807 (2013.01) [H01S 3/08 (2013.01); H04B 10/69 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A receiver for reception of a beam of optical power transmitted by a remote transmitter, the receiver comprising:
at least one photovoltaic cell, each of the output of the at least one photovoltaic cell being coupled to a DC/DC converter;
an optical assembly for retro-reflecting part of the optical power back towards the transmitter, the optical assembly being adapted to ensure that only optical power from the transmitter from directions within a predefined field of view impinge on the optical assembly, the optical assembly comprising:
a focusing element and a back mirror, the back mirror being positioned such that the focusing element focuses optical power onto the back mirror, the focusing element and the back mirror thus comprising a retroreflector,
wherein the focusing element has an essentially flat external surface having a mechanical durability selected to withstand a predetermined level of handling, and
wherein the retro-reflector has an area that is only a minor part of the area of the at least one photovoltaic cell, such that only a minor part of the beam of optical power incident on the receiver is retro-reflected, and diverges towards the transmitter.