194results about How to "Uniform light intensity" patented technology

There is provided an optical element for an illumination system for wavelengths of ≦193 nm. The illumination sytem includes a light source, a field plane, an exit pupil, and a plurality of facets. The plurality of facets receives light from the light source and guides the light to a plurality of discrete points in the field plane. The plurality of discrete points collectively illuminate a field in the field plane, and each of the plurality of facets illuminates a region of the exit pupil.

UV reflectors incorporated in UV LED-based light sources reduce the amount of UV radiation emission into the surroundings and increase the efficiency of such light sources. UV reflectors are made of nanometer-sized particles having a mean particle diameter less than about one-tenth of the wavelength of the UV light emitted by the UV LED, dispersed in a molding or casting material surrounding the LED. Other UV reflectors are series of layers of materials having alternating high and low refractive indices; each layer has a physical thickness of one quarter of the wavelength divided by the refractive index of the material. Nanometer-sized textures formed on a surface of the multilayered reflector further reduce the emission of UV radiation into the surroundings. UV LED-based light sources include such a multilayered reflector disposed on an encapsulating structure of a transparent material around a UV LED, particles of a UV-excitable phosphor dispersed in the transparent material. Alternatively, the transparent material also includes nanometer-sized particles of a UV-radiation scattering material.

A method of adapting a visual unit having a first screen (10) in a first focal plant by the addition of one or more at least partially transparent display screens (20) at least partially overlapping said first screen (10) and located in focal planes distinct from said first focal plane, characterised in that an at least partially transparent emissive layer (21) is provided between said first screen (10) and at least one said additional display screen (20).

A lighting apparatus 10 comprising light sources 12a, 12b for emitting light, a plurality of light reflection portions 20 formed on the reflection side for reflecting light incident from the light sources, and a linear photoconductor 14 for causing the light to exit from the exit side opposed to the reflection side, the planes of the plurality of reflection portions being respectively tilted at angles which converge the light to the human eyes watching. Angles of the light reflection portions are set so that exit angles of light exiting from the linear photoconductor are required angles, whereby the lighting apparatus can have a uniform light intensity distribution. The application of the lighting apparatus can provide a liquid crystal display of good display characteristics.

The invention relates to a rapid prototyping apparatus for the manufacturing of three dimensional objects by additive treatment of cross sections comprising a wholly or partially light-sensitive material, said apparatus comprising at least one light source for illumination of a cross section of the light-sensitive material by at least one spatial light modulator of individually controllable light modulators, wherein at least one light source is optically coupled with a plurality of light guides arranged with respect to the spatial light modulator arrangement in such a manner that each light guide illuminates a sub-area of the cross section.

According to the invention, it is possible to obtain a significant simplification of an RP design system, just as the apparatuses designed are essentially capable of creating prototypes of any size, according to the invention.

A light source device, comprising a light guide block that is provided with an inner wall capable of reflecting light and is shaped as a hollow component to form a light guide, and a point light source array that is located opposite one end face of the light guide block and is capable of emitting light into the light guide.

A cuttable illumination device has a first lamp, a second lamp, a current source element, and a voltage breakdown element connected such that the first lamp may be removed from the device without affecting the function and performance of the remaining portion of the illumination device. Additional lamps may be added to the device in conjunction with additional voltage breakdown elements to form a string of lamps where any number of lamps may be removed without affecting the function and performance of the remaining portion of the device. The device may have a waveguide member and a housing, creating a cuttable illumination device for simulating neon lighting.

On the rear surface of a transparent molded unit is provided a reflecting member. In a central part of the molded unit are encapsulated light emitting devices. In the vicinity of the central part of the reflecting member is formed a reflecting area that is angularly inclined to the rear surface as it moves to the outer circumferential direction. A toric channel is provided on a light irradiation surface of the molded unit, and a slope total reflection area is provided in its inner circumferential side. Light emanating from the light emitting devices is reflected at the slope total reflection area, and further reflected at the direct output area. Then, after being further reflected at the reflecting area of the reflecting member, the light is guided to the outer circumferential end of the reflecting member, and is outputted forward from the total reflection area by being reflected at the outer circumferential end of the reflecting member.

A semiconductor light emitting element is equipped with a layered structure including an active layer, and electrode layers at the upper and lower surfaces thereof. At least one of the upper and lower electrode layers is divided into at least two electrodes, which are separated in the wave guiding direction of light. The active layer is structured to have different gain wavelengths along the wave guiding direction, to emit light having different spectra from each region corresponding to each of the at least two electrodes. The spectral distribution of output light is enabled to be varied by individually varying the current injected by each of the at least two divided electrodes.

The invention provides a light-emitting device which is capable of applying light to a display panel with uniformity in brightness and can be made lower in profile. A light-emitting device (11) includes an LED chip (111a), a base support (111b) which supports the LED chip (111a), and a lens (112) disposed in contact with the LED chip (111a) so as to cover the LED chip (111a) and the base support (111b). The lens (112) has first curved sections (1122) which reflect light that has reached a top surface (112a) so that the reflected light is emitted from a side surface (112b), and second curved sections (1123) which refract light that has reached the top surface (112a) to outside so that the refracted light is emitted from the top surface (112a).

The invention discloses a traditional Chinese painting verification method and a traditional Chinese painting verification device based on a spectral imaging technology. The traditional Chinese painting verification device comprises an image collection module and an image analysis and verification module, wherein the image analysis and verification module comprises a computer, a data base and a display; the image collection module comprises a sealing device, a stable light source with a controllable broadband, spectral imaging consisting of a CCD (Charge Coupled Device), a lens and a light filter device, and an image collection card connected with the CCD; and the stable light source with the controllable broadband is located in the sealing device. The traditional Chinese painting verification method comprises the steps that the stable light source with the controllable broadband is used for irradiating a traditional Chinese painting to be verified; the image collection card is used for collecting spectrum images of different wavebands, which are imaged by spectral imaging, and unloading the spectrum images into the computer; and the computer calls a database to analyze and compare and outputs a verification result to a display. The verification method and device provided by the invention have the characteristics of low background noise, and uniform and controllable light intensity, and can be used for identifying by simultaneously combining spectral signatures with image features.

The invention aims at providing an auxiliary medical device capable of obtaining position and depth information of hand back veins of a human body and relates to a transmission-type hand back vein three-dimensional infrared imager which consists of an infrared source, multi-channel vidicons, a visible light cut-off infrared transmission filter and a computing and processing unit. The technical scheme is that the infrared source emits near-infrared light and irradiates the near-infrared light on a detected region, the infrared light penetrates through a hand back to enter the vidicons through the visible light cut-off infrared transmission filter, the two vidicons can acquire skin images at different angles, a position and depth image of the veins can be obtained after the computing and processing unit performs processing, accordingly the imager assists a doctor to obtain the position and depth information of the veins in a region to be injected, and the success rate of the injection is improved.

An optical system includes semiconductor lasers arranged in the direction of the slow axis of the laser beam, an optical means which makes parallel the collimated laser beams, an optical member which is provided with inlet and outlet faces which are positioned in perpendicular to the optical axis of laser beams and total reflection surfaces which are opposed to each other at a space where the component in the direction of the slow axis of the laser beam entering from the light inlet face repeats internal reflection, and emits from the light outlet face a slow axis uniform laser beam, and an imaging optical means which images the slow axis uniform laser beam on a surface as a linear line beam extending in the direction of the slow axis.

This invention discloses a method for photo-etching smooth surfaces, which takes a large power laser as the light source, collimates the laser beams to parallel lights to pass through diaphragms and a lens to generate split light beams by a splitting element to be gathered on a material surface to form a uniform interference fringe optical field then carries out photo-etching exceeding the material harmful threshold value on the surface of the smooth material characterizing that three or four multiplications of a large power solid laser pumped by diode output by ultraviolet rays are applied as the light source, said diaphragm is an adjustable rectangle and single time pulse process is done at a same position to control the power of the laser so that the material of the interference fringe light-intensity additive position is gasified to form a fringe structure on the surface of the material and mum-stage fringe high speed laser system is realized by this method.

A beam delivery system of a projection exposure system comprises a laser generating a beam of laser light from a plurality of longitudinal laser modes in a cavity, wherein light generated by a single longitudinal laser mode has an average line width λ_lat, wherein the laser light of the beam has, at each of respective lateral positions of the beam, a second line width λ_lat corresponding to lateral laser modes, and wherein the laser light of the beam has, when averaged over a whole cross section thereof, a line width λ_b corresponding to plural lateral laser modes, and wherein λ_m<λ_lat<λ_b, and wherein an optical delay apparatus disposed in the beam provides an optical path difference Δl, wherein

wherein λ₀ is an average wavelength of the light of the first beam of laser light, and Δλ_lat represents the second line width.

The invention discloses an intelligent LED illuminating lamp capable of adjusting color temperature and brightness automatically, which is used to solve the problem that the light intensity and color temperature of the conventional LED illuminating lamp cannot be adjusted, so as to lead to poor comfort level in human eyes. The Intelligent LED illuminating lamp comprises LED lamp beads and a mounting plate for mounting the LED lamp beads, and further comprises a control system, wherein the control system comprises a control chip, a light sensor and a color temperature adjustment module, the color temperature adjustment module and the light sensor are electrically connected with the control chip, and the control chip are electrically connected with the LED lamp beads. The Intelligent LED illuminating lamp can adjust the light intensity and color temperature to improve the comfort level of human eyes according to the variation of environment, can be used in different conditions, and can be greatly extended in function and application range.

A lighting device with variable angle of emission includes a light source, and a lens system comprising two lenses, a primary lens and a secondary lens. The two lenses and the light source are arranged along an optical axis and the distance between the primary lens and the secondary lens is variable, in order to vary the angle of emission of the cone of light rays generated by the lighting device. In one example, the primary lens has a numerical aperture of at least 0.7, the primary lens is an aplanat, and the secondary lens is designed so as to image to infinity, at a certain distance of the secondary lens from the primary lens, a virtual image of the light source generated by the primary lens. According to a second aspect, the illumination factors are distinguished by the fact that the primary lens has a numerical aperture of at least 0.7, and that the secondary lens may be moved by a distance extending in a range in which the secondary lens does not capture the whole of the cone of light rays generated by the primary lens.