Matches 501 - 550 out of 744 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >
Match Document Document Title
5576725 Image display device  
A picture display device includes, as picture projecting components, a light source unit 3 for radiating a light beam, a liquid crystal device 4 for splitting and distributing the light beam in...
5574597 Light scanner and multi-beam generator using the same  
A multi-beam generator has a grating that is provided on a substrate and which is composed of at least three rectangular patterns of unequal width each having only two phase levels. The generator...
5566024 Beam separation control and beam splitting by single blazed binary diffraction optical element  
Two sets of two single blazed binary diffractive optical elements form a beam separation control apparatus for expanding two closely spaced parallel beams into two wider spaced parallel beams or...
5566023 Stepped lens with Fresnel surface structure produced by lithography and process for manufacturing of same  
In a stepped lens with a Fresnel surface structure produced by lithography and a process for fabricating same, the high potential exposure speed of high-speed electron-beam exposure systems which...
5561558 Diffractive optical device  
A diffractive optical device includes a substrate for allowing transmission therethrough of light to be diffracted; and a grating section located on the substrate and including a plurality of...
5559724 Methods and systems for designing beam array generators  
Disclosed are methods and systems for designing beam array generators, or phase masks, utilizing an optimization process which generates an output data set representative of a desired phase...
5555130 Holographic scanning  
A holographic grating element is provided which enables tracing different scan lines. The element is divided into a plurality of sectors. A first grating pattern is provided which diffracts a beam...
5555129 Optical low pass filter  
An optical low pass filter consisting of a diffractive optical element consisting of a plurality of regions which have different imaging characteristics and are joined adjacent to one another so...
5550663 Method of manufacturing optical low-pass filter  
A mother layer made of a thermoplastic resin is formed on the substrate. The mother layer is etched to make a grating layer. The etching process is stopped so that an offset layer remains under the...
5543966 Hybrid refractive/diffractive achromatic camera lens  
A hybrid refractive and diffractive achromatic lens suited for single-use or inexpensive single-lens cameras operating in visible spectral range. The lens comprises a body of optically transmissive...
5537252 Double blazed binary diffraction optical element beam splitter  
A double blazed binary diffractive optical element beam splitter having alternating and opposing individual blazed diffraction gratings upon a multilevel surface relief phase grating structure for...
5513025 Image display apparatus  
An image display apparatus includes an image display device such as, for example, a liquid crystal display panel, having a plurality of dot-shaped picture elements arranged in a two-dimensional...
5504621 Two-dimensional optical low-pass filter  
A two-dimensional optical low-pass filter includes an optical phase grating having a plurality of unitary grating periods on only one side of a grating plane. Each of the unitary grating periods...
5499138 Image display apparatus  
An image display apparatus, for example, a spectacle-type image display apparatus, which is capable of reproducing a high-definition image by projecting pixels at a proper pitch on the retina in...
5496616 Optical element for correcting non-uniform diffraction efficiency in a binary diffractive optical element  
A first binary diffractive optical element has a multi-level surface relief phase grating structure on a substrate. The first binary diffractive optical element can be divided into regions...
5494783 Method of correcting non-uniform diffraction efficiency in a binary diffractive optical element  
A first binary diffractive optical element has a multi-level surface relief phase grating structure on a substrate. The first binary diffractive optical element can be divided into regions...
5486950 Phase correcting zone plate  
A zone plate focusing radiation comprises a plurality of surface portions (20a, 20b, 20c, 20d, 30) corresponding to zones of the zone plate. The surface portions are positioned in a plurality P of...
5486934 Polarization beamsplitter with a substrate-mode holographic structure  
This polarization beamsplitter with a substrate-mode holographic structure is used to separate the s-polarization beam with p-polarization, and guide two separated beams at directions parallel to...
5482800 Exposure mask for fabricating microlenses  
A microlens of any designed configuration is formed as a replica in a photoresist material, and the photoresist material replica is used to reproduce the replica directly in a substrate material.
5473471 Complex lens with diffraction grating  
A complex lens of one-piece construction has first and second lens surfaces opposite to each other. At least one of the first and second lens surfaces of the complex lens is integrally formed with...
5473470 Polarization detector  
A polarization detector includes a polarization diffraction element having a substrate with two facing surfaces which are placed in parallel with each other, a first diffraction grating formed on...
5471344 Photographing apparatus having optical low-pass filter  
A photographing apparatus comprising an optical low-pass filter of phase grating type in which a plurality of prism portions, convex or concave in cross section, are arrayed in succession at a...
5469520 Compression-tuned fiber grating  
A reflective element 26, such as a Bragg grating, impressed in an optical fiber 24, has a reflection wavelength which is tuned by compressing the grating 26. Because an optical fiber is a much...
5461418 Color image pickup apparatus provided with a diffraction type low-pass filter  
In a color image pickup apparatus having an objective lens or a member for removably mounting the objective lens, an image pickup device for converting the image of an object formed by the...
5457573 Diffraction element and an optical multiplexing/demultiplexing device incorporating the same  
According to the present invention, a diffraction element comprising a transparent substrate having a first face and a second face; periodic grooves engraved on the first face; a reflective film...
5442480 Lens/zone plate combination for chromatic dispersion correction  
Chromatic dispersion between first and second wavelengths of light is corrected by a lens/zone plate combination. The zone plate is adapted both to send most of the first wavelength light into its...
5440427 Optical pick-up device having an optical diffraction grating element  
An optical pick-up device comprising an optical system including a light source and an optical diffraction grating element and a light receiving element, wherein the optical diffraction grating...
5436991 Optical waveguide device  
An optical waveguide device for coupling an external wave with a guided wave by means of a grating coupler formed on an optical waveguide device which lies on a substrate. The grating coupler is...
5434709 Wavelength-selective phase grating type optical low-pass filter comprising adhesive layer between transparent layers  
In a wavelength-selective phase-grating type optical low-pass filter including at least a pair of adjacent first and second transparent layers, there is provided at least one adhesive layer through...
5434708 Optical reproducing apparatus ultilizing a polarization beam splitter  
Optical reproducing apparatus utilizes a dual diffraction grating having first and second diffraction gratings with the diffraction gratings oriented at an angle with respect to one another to...
5430546 Optical device for measuring relative position of or angle between two objects  
An optical device for measuring length or an angle between two objects has at least one recombination grid which receives partial beams of light, previously diffracted by a diffraction grid. The...
5428472 Optical scan device having an optical diffraction grating element  
An optical scan device comprising a light source and an optical diffraction grating element movable relatively to the light source, which is designed to substantially linearly scan a recording...
5422753 Binary diffraction optical element for controlling scanning beam intensity in a raster output scanning (ROS) optical system  
A binary diffractive optical element provides uniform intensity for the scanning beam of a raster output scanning (ROS) optical system by diffracting the excess intensity of the beam.
5422745 Preparation of permanent photowritten optical diffraction gratings in irradiated glasses  
A fast process for photowriting a permanent, high efficiency optical grating comprises darkening glass by irradiation and photobleaching the darkened glass by exposing the glass to interfering...
5420947 Method for achromatically coupling a beam of light into a waveguide  
A device for achromatic input coupling of an optical beam into a waveguide is disclosed. The device includes a waveguide formed of a material having an effective index of refraction and having...
5420719 Laser beam frequency doubling system  
For separation of second and higher order second harmonics from a composite laser beam, a substrate is provided with a binary level relief structure that, in the preferred construction, consists of...
5412506 Free-space optical interconnection arrangement  
A diffractive and a refractive microlens component are combined into a doublet lens to obtain imaging properties that are improvements over those achievable using separate components. In one...
5408281 Multifocal contact lens  
A multifocal ophthalmic lens has a spiral-like pattern on its surface in an area overlying the cornea of a wearer of the lens. The spiral-like pattern is capable of providing a plurality of...
5393634 Continuous phase and amplitude holographic elements  
A method for producing a phase hologram using e-beam lithography provides n-ary levels of phase and amplitude by first producing an amplitude hologram on a transparent substrate by e-beam exposure...
5386319 High resolution imagery systems and methods  
The current limits of resolution of multi-element optical systems are exceeded by reducing the number of elements while introducing at the critical aperture a blazed transmission grating having...
5384656 Astigmatism corrected gratings for plane grating and spherical mirror spectrographs  
A modified diffraction grating having a predetermined amount of astigmatic power correction is substituted for the plane diffraction grating in an Ebert type spectrograph having a single concave...
5367588 Method of fabricating Bragg gratings using a silica glass phase grating mask and mask used by same  
An index grating is imprinted in the core of an optical fiber using a specially designed silica glass phase grating mask. The phase mask is held in close proximity to the optical fiber. Laser...
5367403 Optical element and method of fabricating the same  
An optical element includes a crystal of LiTa X Nb 1 -X O 3 which has one of an x-surface and a y-surface, where X denotes an atomic fraction and 0≤X≤1. Proton-exchanged layers periodically...
5367400 Optimal filling of a polygon facet by beam reprofiling  
A raster scanner system is disclosed which utilizes a pair of binary diffraction optic lenses to correct non-uniformity of the flux of a light beam received by a facet of a rotating polygon. Since...
5363239 Method for forming spatially-varying distributed Bragg reflectors in optical media  
A method for forming a grating in a photosensitive medium such as a photosensitive optical fiber. The method comprises impinging a pair of interfering, actinic beams onto the medium, and during the...
5363238 Diffraction grating  
The present invention discloses diffraction gratings which do not generate any thermal strain and can perform extremely high-precision and high-efficiency diffraction nearly free from scattered...
5363226 Apparatus and method for dispersion compensation for a grating coupler using a surface relief reflection grating  
A surface relief reflection diffraction grating is used as a wavelength compensating element for a diffraction grating coupler. The changes in wavelength are compensated for by adjusting the...
5363220 Diffraction device  
The present invention provides a diffraction device having a high diffraction efficiency with respect to a wide-band radiation beam. A diffraction device comprises a substrate and a diffraction...
5362957 Image reading apparatus  
An image reading apparatus is provided with a light-receiving device, an imaging optical system and a blazed diffraction grating. In the light-receiving device, a plurality of line sensors are...
5357591 Cylindrical-wave controlling, generating and guiding devices  
Designs for cylindrical-wave controlling, generating and guiding devices are disclosed, which include multi-cylindrical-layer reflector and anti-reflection for unguided cylindrical waves, and...
Matches 501 - 550 out of 744 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >