Matches 251 - 300 out of 744 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >
Match Document Document Title
6693745 Athermal and high throughput gratings  
A light dispersing device for dispersing a polychromatic input beam into a plurality of narrow-band output beams such that the output beams are directed in a wavelength dependent manner and such...
6693744 Imaging element and image reading apparatus  
An imaging element includes a diffraction optical element on which an off-axis beam with a field angle is incident and a stop. Of beams having different field angles and incident on the diffraction...
6689855 Diffraction devices and methods  
Fluoropolymers consisting of alternating perfluorocyclobutane and aryl ether linkages possess suitable properties for optical waveguides and other devices using refractive properties of the...
6687056 Optical head  
A lens system includes a lens, a grating and a non-periodic phase structure. The lens system is a-thermalised by a compensation of the temperature-dependence of the spherical aberration of the lens...
6687037 Optical scanning device  
An optical device scans record carriers with radiation of two wavelengths. The device has an objective lens with a diffractive part with a pattern of elements of stepped profile. The total of the...
6683718 Diffractive optical element and image reader using the same  
A laminate-type diffractive optical element which is easily producible and which allows high optical performance to be easily achieved, and an optical system using the same, are disclosed. In the...
6680799 Optical polarizing device and laser polarization device  
The invention concerns a light reflecting element comprising a substrate ( 10 ), a multilayer mirror ( 20 ) and optical coupling means ( 32, 40 ) comprising a diffraction grating ( 40 ); whereby...
6678429 Amplitude and phase control in distributed optical structures  
An optical element is provided with one or more sets of diffractive elements. Individual diffractive element transfer functions collectively yield corresponding overall transfer functions between...
6671096 Diffractive optical element and an optical system having a diffractive optical element  
A diffractive optical element for white light is composed of a plurality of layers of optical materials and has a relief pattern constituting a diffraction grating formed at least at one cementing...
6671095 Micro relief element and preparation thereof  
A method of preparing a composite micro relief element. The micro relief element comprises a first layer of a first substrate and a second layer of a relief forming polymer comprising an overlay...
6654184 Method for designing diffractive lens  
A method for designing a diffractive lens that separates an incident light beam into a plurality of beams and condenses the respective separated beams is provided. The method includes: defining an...
6650477 Diffractive optical element and optical apparatus having the same  
A diffractive optical element includes a diffraction optical part provided with a phase-type diffraction grating. The diffraction grating of the diffraction optical part has on the surface thereof...
6643065 Variable spacing diffraction grating  
A variable spacing diffraction grating is fabricated using micro-electromechanical (MEMS) technology. An array of interconnected beam elements is fabricated into a diffraction grating and mounted...
6636666 Optical power equalizer  
The methods and apparatus according to the invention equalize the power of at least one frequency in a multi-wavelength optical signal, or limit the power contained in a single or multi-frequency...
6636660 Monochrometer and wavelength division multiplexer comprising said monochrometer  
A small-sized and low-cost wavelength division multiplexer having little insertion loss, little polarization dependence and a broad wavelength bandwidth, the wavelength division multiplexer...
6633433 Beam shaping for optical scanners  
A beam generator, or beam shaping system, for example for use in an optical scanner, creates a non-Gaussian beam which provides improved indicia-reading characteristics. In one embodiment,...
6631032 Renewable liquid reflection grating  
A renewable liquid reflection grating. Electrodes are operatively connected to a conducting liquid in an arrangement that produces a reflection grating and driven by a current with a resonance...
6628462 Optical system and optical apparatus having the same  
An optical system includes, in order from an object side to an image side, a first lens unit of positive optical power, and a second lens unit of negative refractive power, wherein focusing from an...
6624943 Diffractive optical element and optical system having the same  
A diffractive optical element includes a plurality of laminated diffraction grating surfaces. Each of the diffraction grating surfaces is formed to have a sufficiently small grating thickness as...
6624942 Objective lens for optical pick-up  
An objective lens for an optical pick-up has a refractive lens element provided with a diffraction lens structure on at least one surface thereof. The diffraction lens structure has a plurality of...
6624941 Diffraction optical element  
A diffraction optical element is configured such that a plurality of annular zones having minute steps extending in a direction of the optical axis therebetween are formed on a base element. The...
6621640 Projection display apparatus  
This invention can provide an optical system which has a diffractive optical element that can suppress generation of flare or the like due to light rays of unnecessary orders of diffraction caused...
6621607 Diffractive display  
The present invention is directed to an improvement in a diffractive display suitable for presenting graphic and the like displays. Broadly, a novel embodiment is realized from a holographic...
6611377 Micromechanical diffraction phase grating  
A micromechanical reflection phase grating may be formed of spring-like ribbon reflectors that are secured to a transparent cover positioned over a substrate such as a silicon substrate. The ribbon...
6611376 Diffractive optical element and method of manufacturing the same  
The present invention discloses a diffractive optical element whose optical axis can be precisely positioned, and a method of manufacturing the diffractive optical element. The diffractive optical...
6608720 Optical instrument and optical element thereof  
An optical instrument is described in which a diffractive element is located at a focal or image plane of the instrument and the diffractive element is effective to produce an array of a plurality...
6597401 Image reading system with flare compensation  
An image reading system includes an imaging optical system for forming an image of an object, the optical system including at least one refractive lens and a diffractive grating blazed at a...
6591039 Method and equipment for writing a Bragg grating in a waveguide  
A method for writing a Bragg grating in a waveguide comprises the steps of placing the waveguide in a writing position in which the waveguide extends essentially along one axis; generating a beam...
6590709 Diffractive optical element and method of manufacturing a mold  
A diffractive optical element acts as a lens. The optical element has a diffraction grating. The diffractive grating is provided with a plurality of ridges. Each of the ridges has a transmissive...
6590708 Lens system having diffracting surface and refracting surface and optical apparatus using the lens system  
In a lens system having one or a plurality of diffracting surfaces and one or a plurality of refracting surfaces, a power of each surface and a distance between the surfaces are set such that an...
6587272 Diffractive optical element  
A diffractive optical element is composed of a plurality of diffraction gratings which differ in dispersion from each other and are laminated while being spaced to enhance diffraction efficiency...
6587253 Enhance thermal stability through optical segmentation  
The current invention is directed to devices and systems with patterned reflective surfaces. The reflective surfaces are patterned with primary reflective regions and gap regions. The gap regions...
6583934 Diffraction grating-based wavelength selection unit  
An optical wavelength selection apparatus containing a surface-relief transmission diffraction grating, a collimating lens for collimating a beam incident to the diffraction grating, and a focusing...
6583932 Optical system for diffusing light  
An improved optical system is provided for diffusing light uniformly over a wide angle, including, a diffractive element for diffracting light received by the system in multiple diffraction orders,...
6570710 Subwavelength optical microstructure light collimating films  
A light collimating film has a sheeting having a first side and a second side, wherein the first side includes a series of linear optical elements having a primary axis running the length of the...
6560020 Surface-relief diffraction grating  
A surface-relief transmission diffraction grating which, after having been subjected to a test condition of 85 degrees centigrade and a relative humidity of 85 percent for at least 500 hours, has...
6560019 Diffractive optical element and optical system having the same  
In a diffractive optical element, first and second diffraction gratings of 10 μm or less in thickness made from materials of respective different Abbe numbers are laminated through an air layer....
6560018 Illumination system for transmissive light valve displays  
Binary optics are used in an illumination system for a color projection display. In one embodiment a broad spectrum light source illuminates a multilevel optical phase element which disperses the...
6560017 Compound secure optical identification method and means  
In a preferred embodiment, a method of providing secure identification for an article, including: providing on the article a diffraction grating strip comprising a pattern of a series of...
6556348 Multibeam optical system  
A multibeam optical system that employs a multiline laser source emitting a laser beam at predetermined wavelengths, such as, for example, at wavelengths 488.0 nm and 514.5 nm, and a diffractive...
6552851 Achromatic beam shaping prism  
An achromatic beam shaping prism is disclosed which compensates for a fluctuation in oscillating wavelength of a semiconductor laser source of a recording type optical disc system using a single...
6545808 Phase mask with spatially variable diffraction efficiency  
A phase mask ( 15 ) for modulating a collimated light beam passing therethrough, the light beam being diffracted to photoinduce a refractive index profile in a photosensitive optical medium, the...
6545807 Refractive-diffractive hybrid lens  
Disclosed is a refractive-diffractive hybrid lens that includes a refractive lens having at least one aspherical surface, and a diffractive lens structure having a plurality of concentric...
6542301 Zoom lens and image scanner using it  
A zoom lens includes three lens units which are a first unit having a negative refracting power, a second unit having a positive refracting power, and a third unit having a positive refracting...
6523963 Hermetically sealed diffraction optical element and production method thereof  
The present invention provides a diffraction optical element comprising a first optical member having a first diffraction grating, a second optical member having a second diffraction grating,...
6522465 Transmitting spectral filtering of high power extreme ultra-violet radiation  
In one embodiment of the invention, a transmitting spectral filter includes a thin film layer and a grating structure. The thin film layer is made of transmitting material to transmit a first...
6518555 Polarization hologram lens, optical pickup, information reproduction apparatus and information recording apparatus  
A polarization hologram lens includes: a first portion, positioned at a center of the hologram lens, on which no grating pattern is formed; and a second portion, positioned at an outer...
6514576 Method of manufacturing a diffraction grating  
This invention provides a method of manufacturing a diffraction grating capable of scribing by an interference light at a lower power density than usual. That is, a coating solution containing a...
6507437 Diffractive optical element and photographic optical system having the same  
To obtain a diffractive optical element of high diffraction efficiency over a wide range of wavelengths with no conspicuous color flare and a photographic optical system having the diffractive...
6501601 Optical device with diffraction grating having plural grating regions  
An optical device includes a light-emitting element for irradiating light onto an information recording medium, a diffraction grating for splitting light emitted from said light-emitting element...
Matches 251 - 300 out of 744 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >