8 results about "Partially reflective surface" patented technology

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.

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).