A transmitter of a wireless power transfer and data communication system comprising a transmitter system including a transmitter housing, one or more high-power laser sources, a laser controller, one or more low-power laser sources, one or more photodiodes, a beam steering system and lens assembly, and a safety system. High-power and low-power beams are directed to corresponding receivers and transceivers of a transceiver system inside a remote receiver system by the controller and the beam steering system and lens assembly. Low-power beams include optical communication to the transceiver system. The photodiodes of the transmitter system receive optical communication from the transceiver system. Low-power beams are co-propagated with and in close proximity to high-power beams substantially along an entire distance between the transmitter housing and the receiver system. The safety system instructs the controller to reduce the high-power sources in response to detected events.

A photoelectric conversion element for detecting the spot size of input light. The photoelectric conversion element includes a photoelectric conversion substrate having two main surfaces; a first conductivity-type semiconductor layer and a first electrode layer, which are sequentially laminated on the light receiving surface side, i.e., one main surface, of the photoelectric conversion substrate; and a second conductivity-type semiconductor layer and a second electrode layer, which are sequentially laminated on the rear surface side, i.e., the other main surface, of the photoelectric conversion substrate. The photoelectric conversion element is also provided with an insulating layer that is provided between the photoelectric conversion substrate and the second electrode layer, and the insulating layer has a plurality of through holes that are two-dimensionally provided along the main surface of the photoelectric conversion substrate.

A position-sensitive photodetector device includes a grid of series-connected photodetectors that are electrically coupled to either a vertical photodetector array (VA photodetectors) or to a horizontal photodetector array (HA photodetectors). The VA and HA photodetectors are arranged in an alternating sequence along rows and/or columns throughout the grid. A horizontal-position readout line is electrically coupled to a termination of each vertical photodetector array, and a vertical-position readout line is electrically coupled to a termination of each horizontal photodetector array.

A laser light collecting assembly for a wireless power receiver. The assembly includes a compound parabolic concentrator (CPC) mirror and an optical to electrical converter. The CPC minor has curved internal walls that define an inlet aperture and connect the inlet aperture to an outlet aperture. The inlet aperture may be larger than the outlet aperture. The internal walls may focus a majority of the laser light entering the inlet aperture to the outlet aperture. The optical to electrical converter may be positioned adjacent to the outlet aperture and configured to receive the laser light exiting the outlet aperture so as to convert optical power in the laser light to electrical power.

A transceiver assembly for a wireless power transfer system includes a transceiver system comprising a photodiode assembly, a voltage converter and a light emitting diode and a photodiode. The photodiode assembly may be configured to receive a high-power laser beam from a transmitter and to convert the high-power laser beam to electrical energy. The voltage converter may be configured to adjust an input impedance based on a voltage measure of the photodiode assembly so as to maximize power transfer from the photodiode assembly to an energy storage device electrically coupled to the voltage converter. The light emitting diode and the photodiode may be configured to enable free space optical communication with the transmitter. The light emitting diode may emit signals indicating a presence and a location of the transceiver to the transmitter at least when the energy storage device requires a charge.

A transceiver assembly for a wireless power transfer system includes a transceiver system comprising a photodiode assembly, a voltage converter and a light emitting diode and a photodiode. The photodiode assembly may be configured to receive a high-power laser beam from a transmitter and to convert the high-power laser beam to electrical energy. The voltage converter may be configured to adjust an input impedance based on a voltage measure of the photodiode assembly so as to maximize power transfer from the photodiode assembly to an energy storage device electrically coupled to the voltage converter. The light emitting diode and the photodiode may be configured to enable free space optical communication with the transmitter. The light emitting diode may emit signals indicating a presence and a location of the transceiver to the transmitter at least when the energy storage device requires a charge.

A method of coordinating wireless power transfer and data communication between a transmitter and a receiver comprising recognizing at the receiver that an energy store electrically coupled to the receiver requires an electrical charge, emitting from the receiver a beacon signal to the transmitter, the beacon signal including information about the receiver and a state of charge of the energy store, recognizing at the receiver first and second localization signals from the transmitter, establishing low-power and high-power laser beam connections between the receiver and the transmitter in response to the localization signals, and communicating further information via the low-power beam on a periodic basis while optical power is being transferred via the high-power beam. The low-power beam connection includes further information about the receiver and the state of charge of the energy store. Optical power is transferred from the transmitter to the receiver via the high-power beam.

A detection and locating device comprising a plurality of optical sensors (Q1, Q2, Q3, Q4) having fields that together define the field of the detection and locating device, each sensor having a plurality of photodiodes having fields that together define the field of the sensor, the sensors being connected to a control unit (10) in such a manner that each sensor supplies a first signal corresponding to the sum of the signals from at least two of the photodiodes.

In an illuminance sensor, a slow axis of a first quarter-wave plate has a relation of +45 or 45 in regard to a polarization direction of a first linear polarization plate; a relation of a slow axis of a first portion of a second quarter-wave plate in regard to a polarization direction of a second linear polarization plate is the same with relation of the slow axis of the first quarter-wave plate in regard to the polarization direction of the first linear polarization plate, that is, +45 or 45; and a relation of a slow axis of a second portion of the second quarter plate in regard to the polarization direction of the second linear polarization plate is 45 or +45 that is opposite in sign to the relation of the slow axis of the first quarter-plate in regard to the polarization direction of the first linear polarization plate.

A system controls a brightness of an augmented reality (AR) eye-mounted device. The system includes an eye-mounted display, a photodetector system, and a controller. The eye-mounted display includes a contact lens and a femtoprojector. The femtoprojector is contained in the contact lens and is configured to project an AR image to a user's retina. The AR image is overlaid on an external scene viewed by the user through the contact lens. The photodetector system detects a brightness level of the external scene. Based on the brightness level of the external scene, the controller adjusts a brightness level of the AR image projected to the user's retina. In some embodiments, the eye-mounted display receives image data defining the AR image and the controller adjusts a bit depth of the image data based on the brightness level of the AR image.