Abstract:
A method for producing a holographic recording medium having a holographic recording layer between a first substrate and a second substrate including the steps of: providing a holographic recording layer forming composition onto the first substrate, forming the holographic recording layer between the first substrate and the second substrate by facing the second substrate to the first substrate, and hardening the holographic recording layer by at least one of heat and light.
Abstract:
An arrangement for spatial stereoscopic and/or holographic representation of information has a flat display having a rough surface and a frontal mask connected to the flat display. The rough surface has an immersing layer or a transparent layer or both provided thereon. As an alternative, between the rough surface of the flat display and the mask a space is provided and a closed body made of transparent material and containing immersing material is positioned in the space between the rough surface of the flat display and the mask.
Abstract:
A volume holographic digital data storage system includes a light source, a beam splitter, a spatial light modulator (SLM), a beam reducer including a beam transmission region and a beam absorption or reflection region, a first actuator, a first reflection mirror, a second reflection mirror, a first lens, a second actuator and a storage medium. By reducing the size of a reference beam through the use of the beam reducer and varying an incident location of the reference beam on the first lens by changing the positions of the beam reducer and the first or second reflection mirror, recording density of a holographic digital data storage system can be greatly increased.
Abstract:
An optical unit for projection type image display apparatus, by which the occurrence of registration deviation can be restrained and projected images of high contrast can be obtained, is disclosed. This optical unit comprises a first optical element which performs at least one of color separation and color combination; a holding member attached to the first optical element; and a second optical element which optically acts on one of incident light on the first optical element and emergent light from the first optical element. The linear expansion coefficients a1, a2, and a3 of the materials forming the first optical element, the second optical element, and the holding member have the following relationship: a1
Abstract:
A light bulb, composed of an envelope and an interiorly disposed light source, generates colored light to an observer by providing a reflective holographic optical element (HOE) diffraction grating associated with the envelope. The envelope also has an outer non-light transmissive area in which is disposed a light transmissive aperture. The HOE diffraction grating is oriented to receive and diffract light from the light source and reflect the diffracted light to the aperture for generating a select color of light to the observer. Such light bulb is made by disposing an apertured envelope of a light transmissive aperture disposed within a non-light transmissive area. A reflective holographic optical element (HOE) diffraction grating is associated with the envelope non-light transmissive area. The HOE diffraction grating is oriented to receive and diffract light from the light source and to reflect the diffracted light to the aperture for generating a select color of light to the observer.
Abstract:
Certain types of holographic recording materials can be used to updateably record holographic stereograms formed when fringe patterns are generated through interference of an object laser beam containing image information with a reference laser beam. In this manner, calculation of fringe patterns is avoided, and instead perspective information is computed for a scene or object to be displayed, the information is downloaded to display hardware such as a spatial light modulator, and fringe patterns are subsequently generated through interference of an object laser beam containing this information with a reference laser beam in the classic hologram recording scheme. Previously recorded holographic stereograms or component hogels are updated by erasing the stereograms or component hogels and recording updated stereograms or component hogels, or by recording updated stereograms or component hogels in a separate portion of the holographic recording material.
Abstract:
This invention relates to the production of holographic devices. The holographic devices include a transparent high refractive coating that is applied selectively to provide additional security and moisture resistance.
Abstract:
A device, such as a heads up display, includes equipment for generating a virtual image in the field of view of an observer. The equipment includes at least one light source having a wavelength range less than 2 nm. The light source can be a low pressure gas discharge lamp. The device also includes a holographic optical element that provides a virtual image. The device also includes an image source, such as a mask or an LCD. In one embodiment the holographic optical element combines an image on a display with an ambient image. The holographic element provides multiple colors undistorted in a virtual image appearing to the observer as converging from the same distance.
Abstract:
An observation optical system comprises an image display element 5 and an eyepiece optical system which introduces an image formed by the image display element 5 to a center of an eye of an observer without forming an intermediate image, so as to allow the observer to observe the image as a virtual image. The eyepiece optical system is constructed and arranged to bend the optical axis using reflecting surfaces so as to be compact. The optical axis lies in a plane, with respect to which the optical system is formed symmetric. The optical system includes a prism 3 having an entrance surface 33, a plurality of curved reflecting surfaces 31, 32 and an exit surface 31. The reflecting surface 32 is provided with a volume hologram (HOE) 4. Whereby, it is possible to provide an image observation optical system which can be made compact enough to be usable as an image display unit for a cellular phone or a portable intelligent terminal, and which can achieve high image definition and wide field angle while controlling chromatic aberration of magnification to be small.
Abstract:
An illumination system includes an illumination unit having at least one light emitting device which emits a light beam of a predetermined wavelength and at least one holographic optical element which reduces a cross section of the light beam emitted from the light emitting device, and an optical path changer which changes a proceeding path of an incident light passing through the holographic optical element. A projector includes at least one illumination unit having at least one light emitting device which emits a light beam of a predetermined wavelength and at least one holographic optical element which reduces a cross section of the light beam emitted from the light emitting device, an optical path changer which changes a proceeding path of an incident light input through the holographic optical element, a display device which forms an image by processing a light beam input from the optical path changer according to an image signal, and a projection lens unit which magnifies the image formed by the display device and projects the magnified image toward a screen.