42 results about "Partially reflective surface" patented technology

An apparatus includes a waveguide and one or more partially reflective surfaces embedded inside the waveguide, wherein each of the one or more partially reflective surfaces includes a multi-layer coating structure, wherein a first portion of the multi-layer coating structure induces an overall phase shift of light propagating through the first portion of the multi-layer coating structure and wherein a second portion of the multi-layer coating structure is selected to decrease the overall phase shift.

Base station antennas include a reflector, a first linear array of radiating elements extending forwardly from the reflector, the radiating elements in the first linear array configured to operate in a first frequency band, and a second linear array of radiating elements extending forwardly from the reflector, the radiating elements in the second linear array configured to operate in the first frequency band. These antennas further include an isolation wall that is positioned in between the first linear array of radiating elements and the second linear array of radiating elements. This isolation wall comprises at least one partially reflective surface that is configured to reflect, on average as a function of frequency, between 20% and 80% of incident radiation in the first frequency band.

A near-eye display (10) includes a lightguide optical element (LOE) (12) with opposed major surfaces (12a, 12b), an image projector (14), a first region (16) having partially reflective surfaces (26, 27), and a second region (18) with an out-coupling arrangement (28). To suppress ghosts from single reflections at a facet or interface (25), an elongated light-deflecting structure (261, 271, 251) is provided on the first major surface (12a) adjacent thereto. The structure is configured so that a reverse-traced unguided ray from an eye-motion box (102) that would otherwise impinge the facet / interface is deflected so it does not impinge. A corrective light-deflecting structure (262, 272, 252) on the second major surface (12b) may counter-deflect rays to reduce impact on the peripheral vision. The light-deflecting structures provide beam steering without optical power and may be implemented as prisms or as diffractive / metasurface or volume-holographic elements, formed as discrete strips or portions of a continuous film.

The invention discloses a method for optical measurement of an object having a reflective and / or partially reflective surface. Here, a planar pattern (13) is generated by means of a pattern generator (1), which varies in at least one optical property, so that a large number of different points (p) or a large number of different point groups can be distinguished from one another at least in subregions (10). At least a part of the pattern (13) is reflected as a reflected pattern onto a detector (14) of a camera unit (4) by means of the reflective surface (2) of the object (3), wherein the reflected pattern is converted into a camera image (9) by means of the detector (14). The relationship between the points (q) of the camera image (9) and the corresponding points (p) of the pattern (13) can be described by means of a correspondence function, which is related to the geometric properties of the reflective surface (2) of the object (3). At least one of the geometric properties of the reflective surface (2) of the object (3) is determined by using the differential geometric properties of the transformation given by the correspondence function. Furthermore, a corresponding system and a corresponding measuring device are disclosed.

An optical system has a source-detector unit (SDU) and an optical arrangement. The SDU has a detector arrangement and an illumination arrangement that provides a point source that defines an output sub-region of a planar output-input region of the SDU. The optical arrangement is deployed between the SDU and an at least partially reflective surface. The point source outputs illumination from the output sub-region toward the at least partially reflective surface via at least one optical component of the optical arrangement. The detector arrangement forms an image from illumination from the point source that is reflected from the at least partially reflective surface and received at an input sub-region of the output-input region via at least one optical component of the optical arrangement. A component of the optical system is provided with an optical decenter in relation to a datum axis of the optical system.

An antenna includes a radiating element, a reflective baseplate, a metal enclosure frame, a first reflective surface, and a radiation cavity. The radiating element is on the reflective baseplate and is below the first reflective surface. The reflective baseplate is rectangular. A length of the reflective baseplate is greater than a width of the reflective baseplate. The metal enclosure frame is connected to and encircles the reflective baseplate. The metal enclosure frame includes four enclosure frame surfaces. The four enclosure frame surfaces include two first enclosure frame surfaces, and two second enclosure frame surfaces. The first enclosure frame surfaces are electrically connected to first sides of the reflective baseplate. The second enclosure frame surfaces are electrically connected to second sides of the reflective baseplate. The first sides are greater than the second sides. The first reflective surface includes a secondary reflective surface or a partially reflective surface.

A multilayer coating structure is provided that minimizes phase shift. An apparatus comprising a waveguide and one or more partially reflective surfaces embedded inside the waveguide, wherein each of the one or more partially reflective surfaces comprises a multilayer coating structure, wherein a first portion of the multilayer coating structure causes a total phase shift of light propagating through the first portion of the multilayer coating structure, and wherein a second portion of the multilayer coating structure is selected to reduce the total phase shift.

A device for measuring caustic parameters of a laser beam includes a beam splitter for splitting the laser beam into at least three spatially separated partial beams, and a detection unit for detecting images of the partial beams. A beam path from an input of the device to the beam splitter defines a beam axis for the laser beam, along which the laser beam propagates until entering the beam splitter. The beam splitter includes an optical lens, and a partially reflective surface configured to split the laser beam into the at least three partial beams by partial reflection within the optical lens. The optical lens is positioned off-axis such that an optical axis of the optical lens extends off-axis to the beam axis, and / or the optical lens is tilted such that the optical axis of the optical lens forms an angle with the beam axis that deviates from 0°.

Embodiments of the present application provide an optical module and a near-eye display device; the optical module is used for an XR optical device, and the optical module comprises a first lens, a second lens, and a cemented prism located between the two lenses; the cemented prism mainly comprises two prisms and a polarization reflection element; the second lens comprises a sixth surface and a seventh surface, an air gap is arranged between the sixth surface and the cemented prism, a phase retarder is arranged between the sixth surface and the cemented prism, and the seventh surface is a partially reflective surface; the optical module satisfies: 2.3≤EFL 12 / EFL 67 ≤24.1; wherein, EFL 12 is an effective focal length of the first lens, and EFL 67 is an effective focal length of a light ray incident from the sixth surface, reflected by the seventh surface, and then emitted from the sixth surface.

The invention discloses a broadband high-gain Fabry-Perot resonant cavity antenna based on a water-based metasurface. The antenna is mainly composed of a feed source antenna, a partial reflection surface and a Fabry-Perot resonant cavity between the feed source antenna and the partial reflection surface. Wherein the feed source antenna comprises a metal feeder, a first dielectric plate, a slotted metal ground plane, a metal radiation patch and a second dielectric plate for bearing the metal radiation patch from bottom to top. The partial reflection surface is composed of a water-based metasurface, and the unit structure of the partial reflection surface is composed of a third dielectric plate, a water container and a water layer, wherein a square metal patch is etched on the back of the third dielectric plate, and the water container is borne by the third dielectric plate. The water-based metasurface is loaded above the feed source antenna to serve as a partial reflecting surface to provide directional gain of the antenna, and meanwhile, the working frequency band of the feed source antenna is widened. The antenna has the advantages of wide frequency band, high gain, high directionality and low cost, and has potential application value in the fields of ground penetrating radars and the like.

A display (100) includes a light guide optical element (102) having an internal partially reflective surface (106) for delivering an image from an image projector (100) to an eye of a viewer. Chromatic aberration variations across the appearance of white pixels of an output image are reduced by providing at least a portion of illumination to the white pixels using a broad spectrum white light source (114W). Additionally or alternatively, chromatic aberration correction is provided for a set of white pixels or individual pixels by delivering corresponding white balance correction illumination from red, blue, and / or green light sources (114R, 114G, 114B). When the display is activated to deliver a uniform white image as calculated or preferably measured at one or more locations within an eye movement cartridge (108) from which the image is to be viewed, a correction is derived from a map of the change in chromatic aberration of the display.

The present invention relates to an objective (3) for a confocal system (1) of spectral interferometric measurement, comprising: —a source hole (14); —a second beam splitter (12) having a partially reflective face (12a), —a first beam splitter (10) having a face which is configured to form a reference surface (6) and being located between the source hole (14) and the second beam splitter (12); and—lenses (11, 13). The first and second beam splitters are positioned in the objective (3) such that an optical distance (dref) between the reference surface (6) and the partially reflective surface (12a) is substantially equal to an optical distance (dm) between the partially reflective surface (12a) and a focal plane of the objective (3).

A device for measuring caustic parameters of a laser beam includes a beam splitter for splitting the laser beam into at least three spatially separated partial beams, and a detection unit for detecting images of the partial beams. A beam path from an input of the device to the beam splitter defines a beam axis for the laser beam, along which the laser beam propagates until entering the beam splitter. The beam splitter includes an optical lens, and a partially reflective surface configured to split the laser beam into the at least three partial beams by partial reflection within the optical lens. The optical lens is positioned off-axis such that an optical axis of the optical lens extends off-axis to the beam axis, and / or the optical lens is tilted such that the optical axis of the optical lens forms an angle with the beam axis that deviates from 0°.

A head-worn see-through display includes a display panel adapted to generate image content light, a combiner adapted to reflect the image content light towards an eye of a user, wherein the combiner transmits scene light from a surrounding environment to the eye of the user, and an image expansion optic intermediate the display panel and the combiner. The image expansion optic includes a flat partially reflective and partially reflective surface (the “flat surface”), a curved partially reflective and partially reflective surface (the “curved surface”), and the flat surface adapted to reflect the image content light towards the curved surface and the curved surface adapted to reflect the image light back towards the flat surface, wherein the image light transmits through the flat surface towards the combiner.

The invention relates to a method and device for characterising a terminal comprising a light source and at least one camera. This method makes it possible to characterise a terminal comprising a light source and at least one camera. The method comprises the following steps: - illuminating (E10), with the light source, an at least partially reflective surface; - obtaining (E20) an image of the surface acquired with a camera referred to as the "active camera" from among the at least one camera; - calculating (E60), from this image, the position of a point on the surface within a highlighted light spot; - estimating (E90) a relative position of the light source with respect to the position of the active camera (CAM) on the basis of: (i) the position of the point; and (ii) a position of the surface relative to a plane of the terminal.

A head-worn see-through display includes a display panel adapted to generate image content light, a combiner adapted to reflect the image content light towards an eye of a user, wherein the combiner transmits scene light from a surrounding environment to the eye of the user, and an image expansion optic intermediate the display panel and the combiner. The image expansion optic includes a flat partially reflective and partially reflective surface (the “flat surface”), a curved partially reflective and partially reflective surface (the “curved surface”), and the flat surface adapted to reflect the image content light towards the curved surface and the curved surface adapted to reflect the image light back towards the flat surface, wherein the image light transmits through the flat surface towards the combiner.

An optical display apparatus includes a lightguide optical element (12) with major surfaces (12a, 12b) that guide image light by total internal reflection. A projector (14) injects image light; a first region (16) redirects the guided light from a first to a second direction using reflective or diffractive arrangements, and a second region (18) out-couples the guided light toward an eye- motion box (102). To suppress real-world ghosts from external light that follows a path through the LOE including a single reflection at an internal partially reflective surface (26, 27) or other interface (25), a plurality of ray-blocking elements are formed as elongate strips deployed on one or both of the lightguide surfaces running adjacent to the internal surfaces or interfaces. The ray- blocking strips may be lines of ink. A low-index layer may underlie the ray-blocking elements if needed to preserve lightguide internal reflection.

An optical system for directing image illumination injected at a coupling-in region to an eye-motion box for viewing by an eye of a user, including a light-guide optical element (LOE) formed from transparent material that includes: a first region containing a first set of planar, mutually-parallel, partially-reflecting surfaces having a first orientation; a second region containing a second set of planar, mutually-parallel, partially-reflecting surfaces having a second orientation non-parallel to the first orientation; a set of mutually-parallel major external surfaces extending across the first and second regions, and an optical retarder deployed between the first region and the second region so as to rotate a polarization of light deflected by the first set of partially-reflecting surfaces prior to reaching the second set of partially-reflecting surfaces.

To achieve uniformity in the viewed image, the waveguide should be uniformly "filled" with the projected image and its conjugate image. [Solution] The optical system for displaying an image includes a light guide optical element (LOE) having a coupled input region and a propagation region, a coupled output configuration associated with the propagation region of the LOE, an image projector for producing image illumination corresponding to a collimated image, and a beam multiplier configuration located outside the LOE. The beam multiplier is a transparent plate bonded to the LOE adjacent to the coupled input region. The transparent plate has a partially reflective surface between the LOE and the plate, and a reflector on the opposite surface. The partially reflective surface and the reflector multiply the beam from the projector so that the propagation region of the LOE is fully illuminated by both the collimated image and its conjugate.

A conjugate coupler for coupling image light into a waveguide of a near-eye display comprises a coupling block having multiple facets oriented at conjugate elevation angles relative to a coupling-in mirror. The facets split incoming light rays into complementary ray sets, with at least one partially reflective surface reflecting a first portion and transmitting a second portion of the light. The conjugate coupler generates complementary ray sets that compensate for aperture-filling deficiencies by directing split light rays at varying incidence angles toward the coupling-in mirror, thereby improving illumination uniformity across the waveguide aperture. The first ray set impinges the coupling-in mirror at higher incidence angles than the second ray set, filling aperture regions that would otherwise be unilluminated and enhancing image quality at the eye box of the display.

Method and apparatus for characterizing a terminal comprising a light source and at least one camera. This method allows the characterization of a terminal comprising a light source and at least one camera. It comprises the following steps: - illuminating (E10), with the light source, a surface that is at least partially reflective; - obtaining (E20) an image of said surface acquired with a camera called the "active camera," from among said at least one camera; - calculating (E60), from this image, the position of a point on said surface contained within a highlighted light spot; - estimating (E90) a relative position of the light source with respect to the position of said active camera (CAM) from: (i) the position of said point; and (ii) a position of the surface with respect to a plane of the terminal. Fig. 2

To provide a light guide element for realizing an observation optical system that is compact and can secure a wide eye-motion box. [Solution] The light guide element is a light guide element that guides light from a display element to the observer's eye, and comprises a prism into which light from the display element is incident, and an expanding portion that expands the diameter of the light beam from the prism, and each of the expanding portions has first to third surfaces perpendicular to the intersection surface of the light guide element that intersects with the observer's line of sight direction and parallel to the direction of propagation of the light incident on the expanding portion, the third surface being a partially reflective surface positioned between the first and second surfaces, and the light incident on the expanding portion propagates while being reflected by the intersection surface and the first and second surfaces.

An apparatus includes a waveguide and one or more partially reflective surfaces embedded inside the waveguide, wherein each of the one or more partially reflective surfaces includes a multi-layer coating structure, wherein a first portion of the multi-layer coating structure induces an overall phase shift of light propagating through the first portion of the multi-layer coating structure and wherein a second portion of the multi-layer coating structure is selected to decrease the overall phase shift.

The invention relates to a method for optically measuring an object having a reflective and / or partially reflective surface. According to the invention, by means of a pattern generator (1), a planar pattern (13) is generated which is varied in at least one optical property such that, at least in partial regions (10), a plurality of different points (p) or a plurality of different groups of points are distinguishable from each other. At least parts of the pattern (13) are reflected by a reflective surface (2) of the object (3) as a reflected pattern onto a detector (14) of a camera unit (4), wherein the reflected pattern is converted by the detector (14) into a camera image (9). A connection between points (q) of the camera image (9) and corresponding points (p) of the pattern (13) can be described by means of a correspondence function which is dependent on geometric properties of the reflective surface (2) of the object (3). At least one of the geometric properties of the reflective surface (2) of the object (3) is determined by using differential geometric properties of a transformation given by the correspondence function. The invention furthermore relates to a corresponding system and a corresponding measuring arrangement.

Head-worn computers with eye-imaging systems include a camera system positioned in a head-worn computer, wherein the camera system is further positioned to capture eye-image light that originates as reflections from a user's eye, wherein the camera system is further positioned to capture eye-image light as a reflection from a partially reflective surface that is positioned in front of an image display in the head-worn computer, wherein image light, from the image display, is transmitted through the partially reflective surface. A processor is adapted to cause the camera system to capture the eye-image light. The processor is further adapted to cause a comparison of the captured eye-image light with a pre-stored eye image of a known user of the head-worn computer. In the event the comparison confirms the identity of the known user, the user is granted permission to view content to be presented in a display of the head-worn computer.

An apparatus includes a waveguide and one or more partially reflective surfaces embedded inside the waveguide, wherein each of the one or more partially reflective surfaces includes a multi-layer coating structure, wherein a first portion of the multi-layer coating structure induces an overall phase shift of light propagating through the first portion of the multi-layer coating structure and wherein a second portion of the multi-layer coating structure is selected to decrease the overall phase shift.

An optical system may include a light-guide having a light input and mutually-parallel first and second major external surfaces for guiding the light by internal reflection, a projector configured to project light corresponding to an image from an aperture, the light exiting the aperture with a chief ray defining an optical axis of the projector and with an angular field about the chief ray, and a prism disposed adjacent the light input and having an image injection surface and a partially reflective surface parallel to the first and second major external surfaces, the projector being associated with the image injection surface and oriented such that the chief ray and at least some of the angular field about the chief ray are injected through the image injection surface, some rays corresponding to the angular field partially reflected and some partially transmitted by the partially reflective surface prior to entering the light-guide.

An optical system for directing image illumination injected at a coupling-in region to an eye-motion box for viewing by an eye of a user, including a light-guide optical element (LOE) formed from transparent material that includes: a first region containing a first set of planar, mutually-parallel, partially-reflecting surfaces having a first orientation; a second region containing a second set of planar, mutually-parallel, partially-reflecting surfaces having a second orientation non-parallel to the first orientation; a set of mutually-parallel major external surfaces extending across the first and second regions, and an optical retarder deployed between the first region and the second region so as to rotate a polarization of light deflected by the first set of partially-reflecting surfaces prior to reaching the second set of partially-reflecting surfaces.

Head-worn computers with eye-imaging systems include a camera system positioned in a head-worn computer, wherein the camera system is further positioned to capture eye-image light that originates as reflections from a user's eye, wherein the camera system is further positioned to capture eye-image light as a reflection from a partially reflective surface that is positioned in front of an image display in the head-worn computer, wherein image light, from the image display, is transmitted through the partially reflective surface. A processor is adapted to cause the camera system to capture the eye-image light. The processor is further adapted to cause a comparison of the captured eye-image light with a pre-stored eye image of a known user of the head-worn computer. In the event the comparison confirms the identity of the known user, the user is granted permission to view content to be presented in a display of the head-worn computer.

A holographic display includes a display system and a waveguide. More generally, the waveguide may be a pupil expander or a hologram replicator. The display system is arranged to form a first holographic wavefront and a second holographic wavefront. The waveguide is arranged to receive the first holographic wavefront and the second holographic wavefront. The waveguide is further arranged to guide the first holographic wavefront and the second holographic wavefront between a pair of at least partially reflective surfaces thereof. The display system and the waveguide are respectively arranged such that a first plurality of replicas of the first holographic wavefront are emitted from a first plurality of locations on a first surface of the reflective surface pair of the waveguide, and a second plurality of replicas of the second holographic wavefront are emitted from a second plurality of locations on the first surface.