23 results about "Partially reflective surface" patented technology

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.

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°.

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 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°.

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.

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.

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.

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.

A method for manufacturing a light guide optical element (LOE) is provided. The method involves obtaining a first optical structure and a second optical structure, each optical structure having a set of mutually parallel partially reflective surfaces. The structures are joined together such that their reflective surfaces are non-parallel, thereby forming a third optical structure. At least one of the first optical structure or the second optical structure is cut along a particular line before or after bonding, and the third optical structure is sliced along parallel planes to create one or more LOEs. Each LOE depicts features of parallel major outer surfaces and regions having mutually parallel partially reflective surfaces from two original groups. Specific lines may include contour segments and / or typical straight line segments. The contoured segment defines a contoured distribution of the LOE, and the generally straight segment defines an in-coupling surface of the LOE.

To provide an optical system including a light-guide optical element (LOE) for achieving optical aperture expansion.SOLUTION: An optical system including a light-guide optical element (LOE) comprising a first set of mutually parallel partially reflective surfaces and a second set of mutually parallel partially reflective surfaces in a different orientation than the first set. Both sets of partially reflective surfaces are located between the sets of mutually parallel major external surfaces. Image illumination introduced at the coupling-in position propagates along the LOE, is redirected by the first set of partially reflective surfaces towards the second set of partially reflective surfaces, and is coupled out at the second set of partially reflective surfaces towards the user's eye. The first set of partially reflective surfaces are implemented as partial surfaces located where needed to fill the eye motion box with the required image.SELECTED DRAWING: Figure 2E

An augmented reality system includes a first scene and a second scene. Also, the augmented reality system includes a partially reflective surface positioned relative to the first scene, the second scene, and a viewer to facilitate viewing one of the first scene or the second scene through the partially reflective surface and to facilitate reflecting the other of the first scene or the second scene as an augmented reality image toward the viewer. A sensor of the augmented reality system is designed to detect and generate data indicative of a characteristic of the first scene, and a related effects system is operable to receive the data and adjust the second scene based on the data.

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.

This invention discloses a dual-band common-aperture antenna, method, and apparatus for wireless communication and satellite synchronization, relating to the field of antenna technology. The antenna includes: a partially reflective surface, a feed antenna, and a reflective ground plane arranged sequentially, with the feed antenna located at the center of the reflective ground plane. The partially reflective surface includes a first dielectric substrate and a plurality of partially reflective surface units periodically distributed on the first dielectric. The feed antenna includes a first frequency band unit and a second frequency band unit stacked together, with the first frequency band corresponding to the first frequency band unit being higher than the second frequency band corresponding to the second frequency band unit. The reflective ground includes a fourth dielectric substrate and a plurality of artificial magnetic conductor structure units periodically distributed on the fourth dielectric substrate. The first frequency band units are disposed near the partially reflective surface, and the second frequency band units are disposed near the reflective ground plane. This invention can be used simultaneously for dual-band operation of satellite time synchronization and wireless communication, achieving high spatial reuse and cost savings.

A light guide element includes an expander configured to expand incident light, and a light guide unit configured to guide light expanded by the expander to an eyepoint. The expander includes a first reflector and a second reflector. Each of the first and second reflectors has a plurality of reflective surfaces. In a first cross section including the first and second reflectors, the first and second reflectors form angles with different signs from a first axis corresponding to a principal ray at a central angle of view of the incident light. In each of the first and second reflectors, a reflective surface of the plurality of reflective surfaces closest to the light guide unit is a partially reflective surface. Light reflected multiple times by at least one of the first and second reflectors reaches the light guide unit.

There is provided a leaky-wave antenna arrangement (101) comprising a partially reflective surface (2), a conductive ground plane (3), an actuator (6) and a feed array (155). And the feed source array (155) comprises a plurality of feed sources (15) which are distributed at intervals. Each feed (15) is arranged to couple a radio frequency input signal into the antenna (101). The partially reflective surface (2) and the conductive ground plane (3) are arranged in a stacked manner and substantially parallel to each other, defining a cavity therebetween. The antenna arrangement (101) is configured such that a beam formed by the antenna arrangement (101) can be steerable in a first direction by operating the actuator, and such that the beam can be steerable in a second direction by a change in the relative phase of the radio frequency signal coupled to the cavity by each of the feeds (15).