Abstract:
Systems, devices, and methods for making, replicating, and using curved holographic optical elements (“HOEs”) are described. A hologram may be optically recorded into a planar layer of holographic film with various measures in place to compensate for changes (e.g., in optical power and/or playback wavelength and/or angular bandwidth) that may result when a curvature is subsequently applied thereto. A hologram may be optically recorded into a curved layer of holographic film with various measures in place to compensate for optical effects of a curved transparent substrate upon which the holographic film is mounted. A curved HOE may be returned to a planar configuration to undergo holographic replication or holographic replication may be performed using a curved master HOE and curved “recipient” film. The curved HOEs described herein are particularly well-suited for use when integrated with a curved eyeglass lens to form the transparent combiner of a virtual retina display.
Abstract:
The present invention provides a means for improving diffraction efficiency and suppressing ghosting with respect to a holographic optical element having a volume hologram recording layer. The present invention is a holographic optical element comprising a volume hologam recording layer that includes a photopolymer, and at least one adjacent layer that includes a resin and is in contact with the volume hologram recording layer, wherein a diffraction grating is formed so as to extend from the volume hologram recording layer to the adjacent layer.
Abstract:
A laser beam (L50) generated by a laser light source (50) is reflected by a light beam scanning device (60), and irradiated onto a hologram recording medium (45). On the hologram recording medium (45), an image (35) of a scatter plate is recorded as a hologram by using reference light that converges on a scanning origin (B). The light beam scanning device (60) bends the laser beam (L50) at the scanning origin (B) and irradiates it onto the hologram recording medium (45). At this time, scanning is carried out by changing the bending mode of the laser beam with time so that the irradiation position of the bent laser beam (L60) on the hologram recording medium (45) changes with time. Regardless of the beam irradiation position, diffracted light (L45) from the hologram recording medium (45) reproduces the same reproduction image (35) of the scatter plate at the same position. An illumination spot in which speckles are reduced is formed on the light receiving surface (R) of an illuminating object (70) by the reproduction image (35) of the hologram.
Abstract:
Die Erfindung betrifft ein Verfahren zum Herstellen eines Hologramms, insbesondere eines Transmissionshologramms, umfassend: Bereitstellen von einem Aufzeichnungshologramm (703, 803, 1203), Belichten des Aufzeichnungshologramms (703, 803, 1203) mit einem durch eine kohärente Lichtquelle (809) erzeugten Objektstrahl (704, 804, 1204), wobei ein abzubildendes Objekt (711, 811,1231) in dem Objektstrahlengang vorgesehen ist, und Belichten des Aufzeichnungshologramms (703, 803, 1203) mit einem durch die kohärente Lichtquelle (809) erzeugten Referenzstrahl (705, 805, 1205), wobei der Referenzstrahl (705, 805, 1205) von einem optischen Referenzmodul (716, 816, 1230) derart winkelgeändert wird, dass der Referenzstrahl (705, 805, 1205) am Ort des Aufzeichnungshologramms (703, 803, 1203) ein Winkelspektrum aufweist.
Abstract:
A projection apparatus has an optical device configured to be capable of diffusing coherent light beams, an irradiation unit configured to irradiate the coherent light beams to the optical device so that the coherent light beams scan the optical device, a light modulator that is illuminated by coherent light beams incident on and diffused at respective points of the optical device from the irradiation unit, a projection optical system configured to project a modulated image generated by the light modulator onto a scattering plane, and an intermediate optical system provided between the optical device and the light modulator, configured to restrict an diffusion angle of coherent light beams diffused by the optical device.
Abstract:
Provided is a three-dimensional image projector capable of displaying a highly reproducible three-dimensional image in response to changes in a viewer's position and easily accomplishing system downsizing. The three-dimensional image projector 1 includes: a projection image forming disc 4 in which hologram sheets 9a, 9b, 9c are laminated along inner surfaces 10a, 10b of glass substrates 8a, 8b, and which projects image light by causing the image light having directivity to fall incident on the hologram sheets 9a, 9b, 9c; and a rotational drive unit 3 for rotationally driving the projection image forming disc 4 along a surface of the glass substrates 8a, 8b, with a center point C 1 serving as the rotation center, wherein the hologram sheets 9a, 9b, 9c are preliminarily recorded with holograms 11a, 11b, 11c of a mode that are formed by causing reference light and object light as two laser beams L 3 , L 2 to simultaneously fall incident on a position corresponding to the center point C 1 while maintaining the incidence angle θ 1 to the hologram sheets 9a, 9b, 9c to be substantially the same.
Abstract:
A three-dimensional imaging apparatus 101 for generating an image of a three-dimensional object 111 is disclosed. The 3D-imaging apparatus 101 has two sets 103a, 103b of reflective elements 105, an image-capturing device 107 and a processor. The image-capturing device 107 is for capturing two images using rays emitted from the object 111 and reflected from each of the two sets 103a, 103b of reflective elements 105. The processor is arranged to identify a plurality of sets of matching points in the respective captured images, each set of the matching points having been generated by the respective rays emitted by a single corresponding element of the object 111. For each set of the matching points identified in the respective captured images, the processor is arranged to determine a location of the corresponding element of the object 111. Thus, a three-dimensional image of the object 111 can be generated by the processor using the determined locations of a plurality of elements of the object 111. A method of generating a three-dimensional image of an object is also disclosed.
Abstract:
In various embodiments described herein, a device comprising one or more light guides that is optically coupled to one or more photocells is described. The device further comprises one or more light turning films or layers comprising volume or surface diffractive features or holograms. Light incident on the light guides is turned by volume or surface diffractive features or holograms that are reflective or transmissive and guided through the light guides by multiple total internal reflections. The guided light is directed towards the photocells. In certain embodiments, solar energy is also used to power or heat a thermal generator to heat water or produce electricity from steam. Various embodiments may comprise an air gap or an optical isolation layer disposed between the multiple light guides.
Abstract:
Provided are an apparatus and method of displaying a three-dimensional image. The apparatus includes: alight source unit and a volume diffractive element diffracting beams emitted from the light sources unit so that spots of the beams can be formed at different positions from each other in a proceeding direction of the beams diffracted by the volume diffractive element to scan the beams in a first direction.