US Pat. No. 10,558,027

METHOD OF CONCENTRATING LIGHT AND LIGHT CONCENTRATOR

BERGISCHE UNIVERSITAET WU...

1. A method of concentrating light by coupling light into a thin film waveguide arranged on a substrate via at least one of its parallel surfaces, the method comprising the step of exciting in the thin-film-waveguide at least one lateral guided mode having a node by scattering, diffraction or surface plasmon excitation of the incident light at a nanopatterned discontinuous excitation layer, the nanopatterned discontinuous excitation layer being in the thin-film-waveguide at a position of the node of the guided lateral mode.

US Pat. No. 10,734,870

ELECTRIC DRIVE SYSTEM

BERGISCHE UNIVERSITAET WU...

1. In an electric drive system comprising:an electric motor having a stator with a current-feed system and an output shaft defining a rotation axis;
a power supply axially adjacent the electric motor and around the rotation axis of the electric motor circumferentially, and
a plurality of energy-storage cells in the power supply, the improvement wherein:
the power supply is cylindrical and formed by a plurality of axially adjacent disks each in turn subdivided angularly into a plurality of segments each formed with a plurality of axially extending cylindrical seats each holding a respective one of the energy-storage cells, each seat being aligned axially with the seats of adjacent disks;
each segment is aligned axially with a respective one of the segments of adjacent disks and forms therewith a respective energy-storage module extending a full axial length of the power supply, independent of the other energy-storage modules, and capable of powering the motor;
a control board between opposing axial end faces of the electric motor and of the power supply; and
respective power electronics on the control board each connected between a respective one of the energy storage modules and the current-feed system of the electric motor.

US Pat. No. 10,739,623

WAVEGUIDE, METHOD OF PROJECTING LIGHT FROM A WAVEGUIDE, AND DISPLAY

BERGISCHE UNIVERSITAET WU...

1. A waveguide comprisinga substrate carrying at least two laminates forming a stack extending in a stacking direction, the laminates each having at least one transparent dielectric layer with a higher refractive index than the substrate;
a light-outcoupling structure influencing light propagation and that extends as a layer at least in some regions between two adjacent laminates, a position of the structure in the stack corresponding to a node position of a waveguide mode that can be guided in the waveguide with at least one node; and
at least one means for generating an electrical field in the stack and therewith at least temporarily changing an optical thickness of at least one of the laminates that has a refractive index or geometric thickness changeable by the electric field and that is adjacent the structure and thereby also changes the position of the node of the guided waveguide mode and the structure relative to one another.

US Pat. No. 10,666,116

ELECTRO DRIVE SYSTEM

BERGISCHE UNIVERSITAET WU...

1. An electric drive comprising:an electric motor centered on an axis;
a power supply having a tubular and cylindrical housing radially surrounding the motor and formed by a plurality of axially adjacent rings each divided angularly into at least two segments and formed with a plurality of axially extending chambers each dimensioned to hold a respective axially extending energy-storing cell; and
an interconnection plate shaped as a circular ring segment and mounted between the segments of adjacent rings positioned axially one after the other.