81 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.

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 provides a low RCS F-P resonant cavity antenna based on a lossy metasurface and an AMC structure. The low RCS F-P resonant cavity antenna comprises an absorption type partial reflection surface structure located on the upper portion and a feed source antenna structure located on the lower portion. The absorption type partial reflection surface structure comprises a lossy metasurface layer, a metal patch common ground layer and a metal patch AMC1 layer which are separated by a first dielectric substrate layer and a second dielectric substrate layer; the feed source antenna structure comprises an antenna patch layer, a metal floor layer, a coaxial structure and a third dielectric substrate layer, the antenna patch layer and the metal floor layer are oppositely arranged on the third dielectric substrate layer, and the coaxial structure is connected between the antenna patch layer and the metal floor layer. According to the invention, a method for analyzing the wave absorption and reflection performance of the two ports of the PRS structure unit is adopted, the process of integrated design of the low-RCS, high-directivity and high-gain F-P antenna is simplified, the overall profile of the antenna is effectively reduced, and the antenna is easier to be integrated with other radio frequency devices for use.

An apparatus includes one or more antennas; control circuitry coupled to the one or more antennas, the control circuitry configured to drive the antennas to emit radiation; a radome under which the one or more antennas are disposed; and a partially reflective surface (PRS) in or on the radome, the PRS configured to enhance a gain of emission of the radiation by the one or more antennas.

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.

Methods for fabricating light-guide optical elements (LOEs) are provided. The methods involve obtaining first and second optical structures, each with a set of mutually-parallel partially reflective surfaces. These structures are bonded together such that their reflective surfaces are non-parallel, forming a third optical structure. At least one of the first or second optical structure is cut along a specific line, prior to bonding or after bonding, and the third optical structure is sliced along parallel planes to create one or more LOEs. Each LOE features parallel major external surfaces and regions with mutually-parallel partially reflective surfaces from both original sets. The specific line can include a contoured section and / or a typically straight section. The contoured section defines a contoured profile of the LOE, and the typically straight section defines a coupling-in surface of the LOE.

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.

An embodiment of the present application provides an optical module and a near-eye display device; the optical module is used for an XR optical device, and the optical module includes adjacent and spaced-apart cemented prisms and a lens; the cemented prism includes a first prism, a polarized reflective element, and a second prism arranged in sequence, the lens is located on a side of the second prism away from the first prism, and a phase retarder is provided between the lens and the second prism; the lens includes a fifth surface and a sixth surface, the sixth surface faces away from the cemented prism, and the sixth surface is a partially reflective surface; the cemented prism and the lens include at least two curved surfaces; the optical module satisfies 7.4≤|EFL 24 / EFL 56 |≤9.2; EFL 24 is the effective focal length of the cemented prism, EFL 56 It is the effective focal length of light incident from the fifth surface, reflected by the sixth surface, and then emitted from the fifth surface.

The optical system may include: a light guide having a light input end and first and second main outer surfaces parallel to each other for guiding light by internal reflection; a projector configured to project light corresponding to the image from the aperture, the light exiting the aperture with a chief ray defining an optical axis of the projector and with an angular field surrounding the chief ray; and a prism disposed adjacent to the light input and having a partially reflective surface parallel to the first and second major outer surfaces and an image injection surface, the projector associated with the image injection surface and oriented such that at least some of a chief ray and an angular field surrounding the chief ray are injected through the image injection surface, prior to entering the light guide, some of the light corresponding to the angular field is partially reflected by the partially reflective surface and some is partially transmitted by the 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.

A diode laser system employing a vapor cell in an external cavity and related techniques are disclosed. The system may be configured to provide high-power, multi-mode output within one or more narrow ranges of wavelengths. A beam emitted from the laser along an initial optical axis passes through a vapor cell, where the effective ground-state occupation density of the vapor is reduced, causing spatial gradients of the vapor's effective index of refraction. Refraction of rays passing through these gradients produces angular deflections, most significantly for rays where the gradients are strongest and for wavelengths whose index of refraction departs furthest from unity near these atomic transitions. An at least partially reflective surface which is not aligned with the initial optical axis but rather is aligned perpendicular to some of these deflected rays provides feedback within an angular range, thereby contributing to the gain of the laser source for these wavelengths.

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.

The optical system includes a partially internally reflective rectangular light guide (PRLG) (10) having three surfaces that support internal reflection and a partially reflective fourth surface (34) with which a second light guide portion (30) is associated. Typically, a light beam redirecting arrangement including partially reflective surfaces (12) embedded in a set of light guide portions (30) redirects light emerging from the PRLG towards a third light guide portion (20) that includes a combining arrangement (122), such as a further set of partially reflective surfaces (28), to combine out an image light beam towards a user's eye.

A holographic display comprising a display system and a waveguide. More generally, the waveguide may be a pupil expander or 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 second holographic wavefront. The 5 waveguide is further arranged to waveguide the first holographic wavefront and second holographic wavefront between a pair of at least partially reflective surfaces thereof. The display system and 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 pair of reflective surfaces of the waveguide and a second plurality of replicas of the second holographic 0 wavefront are emitted from a second plurality of locations on the first surface.

To uniformly "fill" a waveguide with a projected image and its conjugate image in order to achieve uniformity of a viewed image.SOLUTION: An optical system for displaying an image includes a light-guide optical element (LOE) having a coupling-in region and a propagation region, a coupling-out configuration associated with the propagation region of the LOE, an image projector for generating image illumination corresponding to a collimated image, and a beam-multiplication configuration external to the LOE. The beam multiplier is a transparent plate bonded to the LOE adjacent to the coupling-in region. The transparent plate has a partially reflective surface between the LOE and the plate, and a reflector at the opposite surface. The partially reflective surface and the reflector multiply the beam from the projector so as to fully illuminate the propagation region of the LOE with both the collimated image and a conjugate of the collimated image.SELECTED DRAWING: Figure 5

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 optical system has a light guide optical element (LOE) having a pair of parallel major outer surfaces that support propagation of image illumination within the LOE by internal reflection at the major outer surfaces. A plurality of mutually parallel partially reflective surfaces are disposed obliquely relative to the major outer surface within the out-coupling region of the LOE and couple at least a portion of the image illumination out of the LOE towards the eye movement box. In an embodiment, a planar homogenizer is located inside the LOE and parallel to the major outer surface, and extends at least partially into the out-coupling region to overlap some but not all of the partially reflective surfaces parallel to each other. In another embodiment, the LOE includes a second plurality of mutually parallel partially reflective surfaces, and the homogenizer is alternatively disposed in overlap correlation with the second plurality of mutually parallel partially reflective surfaces.

A LiDAR system includes an optical source to emit an optical beam toward a target, a partially reflective surface to generate a local oscillator (LO) signal from the optical beam, and an optical lens disposed in front of a photodetector (PD), wherein the LO signal is incident at a decenter of the optical lens to shift the LO signal at the photodetector with respect to a return signal received from the target.

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.

The invention provides a display device and a head-mounted display device. The display device comprises an image source, a polarization polarizer, a first quarter-wavelength phase plate, a partially-transmitting and partially-reflecting surface, a second quarter-wavelength phase plate and a reflective polarizer which are arranged in a direction from an image side to human eyes, wherein the image source comprises a first display screen and a second display screen; wherein the display surface of the first display screen and the display surface of the second display screen are relatively inclined; the second quarter-wavelength sheet, the reflective polarizer and the partial transmission and partial reflection surface composed of the first outer convex surface and the second outer convex surface are all common components, the structure of the display device is simplified, the size of the display device can be reduced, and miniaturization is facilitated. In addition, images are provided through the first display screen and the second display screen, and therefore a large field angle is provided.

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.