1236 results about "High reflectivity" patented technology

The invention relates to a preparation method and an application of multistage-spreading heat-dissipation fire-proof heat-insulation composite fabric. The multistage-spreading heat-dissipation fire-proof heat-insulation composite fabric is formed by successively arranging and laminating a metal foil reflection layer, a phase change temperature limitation layer, an interval composite membrane heat-insulation layer and a flame-retardant comfortable layer, wherein the metal foil reflection layer has high reflectivity and an enhanced heat-dissipation function; the phase change temperature limitation layer has functions of high energy consumption absorption and evenly-distributed heat conduction; the interval composite membrane heat-insulation layer has the functions of reflection insulation and even distribution of heat; and the flame-retardant comfortable layer has the functions of low-contact heat conduction, heat insulation and comfort. When the front side of the multistage-spreading heat-dissipation fire-proof heat-insulation composite fabric is under the action of open fire and strong heat flow environment, the back side of the multistage-spreading heat-dissipation fire-proof heat-insulation composite fabric can be kept below 50DEG C which is near the safe temperature state of the human skin, and the integral structural form and the mechanical property are stable. The natural thickness of the composite fabric is 5-15mm, the compression thickness of the composite fabric is 3-8mm, and the square meter quality of the composite fabric is 400-1500g/m<2>. The composite fabric is fire-proof heat-insulation material which is totally sealed, stuck and sewn and can be used for individual protection and environment heat insulation in special high-temperature occasions, such as fire control, military, exploration, safe escape and industry and the like.

A semiconductor device emitting light about a predetermined wavelength comprising a structure comprising a plurality of layers, sometimes referred to as a stack, providing low resistance, high reflectivity and ohmic contacts to at least one semiconductor material.

A light emitting device comprises a novel low-loss array of conductive vias embedded in a dielectric multilayer stack, to act as an electrically-conductive, low-loss, high-reflectivity reflector layer (CVMR). In one example the CVMR stack is employed between a reflective metal bottom contact and a p-GaN semiconductor flip chip layer. The CVMR stack comprises at least (3) layers with at least (2) differing dielectric constants. The conductive vias are arranged such that localised and propagating surface plasmons associated with the structure reside within the electromagnetic stopband of the CVMR stack, which in turn inhibits trapped LED modes coupling into these plasmonic modes, thereby increasing the overall reflectivity of the CVM R. This technique improves optical light extraction and provides a vertical conduction path for optimal current spreading in a semiconductor light emitting device. A light emitting module and method of manufacture are also described.

A semiconductor light-emitting device comprises an N-type semiconductor layer, an active layer formed on the surface of the N-type semiconductor layer, a P-type semiconductor layer formed on the surface of the active layer, and a reflective layer formed on the surface of the P-type semiconductor layer. A plurality of ohmic contact blocks with electrical properties of ohmic contact are on the surface of the reflective layer adjacent to the P-type semiconductor layer, and the remaining part of the surface acts as the reflective regions with higher reflectivity, and the reflective regions can effectively reflect the light generated from the active layer.

To solve the existing problems in distributed Bragg reflectors (DBR) used in the prior art, the present invention provides a fabrication method of group III nitride based distributed Bragg reflectors (DBR) for vertical cavity surface emitting lasers (VCSELs), which suppresses the generation of cracks, and a distributed Bragg reflector with high reflectivity, broad stopband, and adaptability to optical devices such as vertical cavity surface emitting lasers, micro-cavity light emitting diodes, resonance cavity light emitting diodes and photodetectors.

A silver-based alloy thin film is provided for the highly reflective or semi-reflective coating layer of optical discs. Alloy additions to silver include zinc, aluminum, zinc plus aluminum, manganese, germanium, and copper plus manganese. These alloys have moderate to high reflectivity and reasonable corrosion resistance in the ambient environment.

Composite mirror systems include a wideband thin film interference stack having a plurality of microlayers and an optically thick layer having a refractive index greater than air but less than the smallest refractive index of the stack. The mirror systems can provide high reflectivity for light propagating in the stack and in the optically thick layer at supercritical angles, while avoiding degradation in reflectivity if dirt or other disturbances such as absorbing materials are present at the mirror backside for example due to contact with a support structure.

The invention is a light emitting diode that exhibits high reflectivity to externally incident light and high extraction efficiency for internally generated light. The light emitting diode includes a first reflecting electrode that reflects both externally incident light and internally generated light. A multi-layer semiconductor structure is in contact with the first reflecting layer and has an active region that emits the internally generated light in an emitting wavelength range. The multi-layer semiconductor structure has an absorption coefficient less than 50 cm⁻¹. A second reflecting electrode underlies the multi-layer semiconductor structure and reflects both the externally incident light and the internally generated light. An array of light extracting elements extends at least part way through the multi-layer semiconductor structure and improves the extraction efficiency for the internally generated light. The light emitting diode has a reflectivity greater than 60 percent for externally incident light in the emitting wavelength range and has an extraction efficiency greater than 40 percent.

A plurality of separate lead frames can be insert-molded in a reflector composed of a white resin having a high reflectivity to form a package for an LED device. A cavity is formed in the reflector. The cavity can have an inner circumferential surface that opens wider in an upward direction. Cups can be located in the cavity. Each cup has an outer wall that can be in the form of a cylinder with the bottom formed of each of two separate lead frames. A red LED chip and a green LED chip can be adhesively fixed to the lead frames located on the bottoms of the respective cups. The LED chips can have lower electrodes, which are electrically brought into conduction with the lead frames one by one. The LED chips can also have upper electrodes, which are electrically brought into conduction with the lead frames one by one via bonding wires. A light transmissive resin can be filled in the cavity.

A weather radar system has bright band detection and compensation. The weather radar system determines that high reflectivity in weather is a bright band and reduces an encoded return level from the bright band to compensate for it on a display. The weather radar system detects the presence of the bright band using an inference system that uses outside air temperature, aircraft altitude, and an assumed lapse rate to estimate the bright band location relative to the aircraft and uses antenna elevation to estimate bright band range to reduce the encoded radar return level on the display. The weather radar system may also detect the presence of the bright band using a detection system that uses radar estimates from normal reflectivity scan operation of the system. The weather radar system may also use an active detection process separate from a normal radar sampling process to detect the bright band.

This invention is an illumination system that incorporates a light emitting diode and a partially reflecting optical element. The light emitting diode emits internally generated light and reflects incident light with high reflectivity. The partially reflecting optical element transmits a first portion of the internally generated light and reflects a second portion of the internally generated light back to the light emitting diode, where the second portion is reflected by the light emitting diode. The partially reflecting optical element can be a non-absorbing reflecting polarizer or a wavelength conversion layer. Utilizing a partially reflecting optical element and light recycling can increase the effective brightness and the output efficiency of the illumination system.

A planar laser gain medium and laser system. The novel laser gain medium includes an active core having a high aspect ratio cross-section with a fast-axis dimension and a slow-axis dimension, signal claddings adapted to form reflective boundaries at fast-axis boundaries of the core, and a material adapted to minimize reflections at slow-axis boundaries of the core. In an illustrative embodiment, the laser gain medium is an optical fiber. The core and claddings form a waveguide adapted to control modes propagating in the fast-axis direction. When the laser gain medium is employed as a laser oscillator, a high reflectivity mirror and an outcoupler are positioned at opposite ends of the core to form a laser resonator adapted to control modes in the slow-axis direction.

The embodiment of the invention discloses a wavelength conversion device, a diffuse reflection layer, a light source system and a projection system. The wavelength conversion device comprises a fluorescent layer containing fluorescent powder for realizing wavelength conversion, as well as the diffuse reflection layer attached to the backlight surface of the fluorescent layer; the diffuse reflection layer comprises white scattering particles and a first binding element bound with the white scattering particles; the ratio of the refractive index of the white scattering particles to that of the first binding element is greater than 1.2. After the invention is adopted, a thinner diffuse reflection layer can achieve high reflectivity, and the thinner diffuse reflection layer is beneficial to shortening of a heat conduction path of a luminous layer, so that the heat stability of the wavelength conversion device is improved.

The invention relates to a nitride semiconductor LED, wherein an n-doped nitride semiconductor layer is formed on a transparent substrate. An active layer is formed on the n-doped nitride semiconductor layer. A p-doped nitride semiconductor layer is formed on the active layer. A high reflectivity Ohmic contact layer of a mesh structure is formed on the p-doped nitride semiconductor layer and has a number of open areas for exposing the p-doped nitride semiconductor layer. A metal barrier layer is formed on at least a top region of the high reflectivity Ohmic contact layer. A p-bonding electrode is formed on the metal barrier layer. An n-electrode is formed on the n-doped nitride semiconductor layer.

The present invention has been completed in view of such situation, and an object of the present invention is to find a Ag based alloy which exhibits high cohesion resistance, high light resistance, high heat resistance, high reflectivity, high transmissivity, low absorptivity, and high thermal conductivity of the level which had not been realized by the pure Ag or by the conventional Ag alloys, and on the bases of such alloy, to provide a semi-reflective film and a reflective film for an optical information recording medium provided with excellent writing/reading properties and long term reliability; sputtering target for an optical information recording medium used in depositing such semi-reflective film and the reflective film; and an optical information recording medium provided with such semi-reflective film or the reflective film. A semi-reflective film or reflective film for an optical information recording medium comprising a Ag based alloy, wherein the Ag based alloy comprises 0.005 to 0.40% (at % unless otherwise noted) of Bi and 0.05 to 5% in total of at least one element selected from Zn, Al, Ga, In, Si, Ge, and Sn.

A system and method for controlling the light source of a cavity ring-down spectrometer (CRDS). The system comprises a resonant optical cavity having at least two high reflectivity mirrors; a source for providing a continuous wave optical signal into the optical cavity, the source comprising an electrically pumped semiconductor gain medium; and a SOA interposed between the optical signal source and the optical cavity. The SOA receives the optical signal and transmits it to the resonant optical cavity. The system also includes a first detector for monitoring the intensity of radiation emitted from said cavity and generating a first detection signal based thereon; and at least a first controller for deactivating the optical signal based on a comparison of the first detection signal and a predetermined threshold and for thereafter reactivating the optical signal after a delay period in excess of the ring-down time of the optical cavity, the deactivating and reactivating being achieved by respectively turning off and then turning on electrical current to the SOA.

A high power LED package, in which substantially planar first and second lead frames made of high reflectivity metal are spaced from each other for a predetermined gap. An LED chip is seated on at least one of the lead frames, and having terminals electrically connected to the lead frames, respectively. A package body made of resin seals the LED chip therein while fixedly securing the lead frame in the bottom thereof. The encapsulant preferably fills up the gap between the first and second lead frames. The LED package is structured to raise thermal radiation efficiency thereby reducing the size and thickness thereof.

The luminous efficiency and radiance of light emitting diodes (LEDs) fabricated from organic emissive materials can be increased by using a multilayer cathode including a low work function layer and a high work function high reflectivity layer, in combination with a high work function, high reflectivitity anode material in the device.

A variable focal length lens consists of many micromirrors with degrees of freedom rotation and/or degrees of freedom translation and actuating components. As operating methods for the lens, the actuating components control the positions of micromirrors electrostatically and/or electromagnetically. The optical efficiency of the variable focal length lens is increased by locating a mechanical structure upholding micromirrors and the actuating components under micromirrors. The lens can correct aberration by controlling each micromirror independently. The lens can also be of a desired arbitrary shape and/or size. The micromirrors are arranged in a flat plane or in a curved plane with a predetermined curvature. The electrodes determining the position of the micromirrors can be made of material with high electrical conductivity, preferably metal. The surface material of the micromirror is made of a material with high reflectivity such as aluminum, silver, and gold, which are coated with multi-layer dielectric material or antioxidant.

The invention discloses a light reflecting thin film of a photovoltaic module and a method for fixing the light reflecting thin film and a soldering strip. The light reflecting thin film of the photovoltaic module comprises a base material, a micro-prism layer and a light reflecting layer. The thickness of the base material ranges from 10 micrometers to 1 millimeter, and the base material comprises plastic base material body and a paper base material body. The micro-prism layer is arranged on the upper surface of the base material, the thickness of the micro-prism layer ranges from 1 micrometer to 500 micrometers, and the micro-prism layer is made of plastic and is of a texture structure. The light reflecting layer is arranged on the upper surface of the micro-prism layer, the thickness of the light reflecting layer ranges from 1 micrometer to 500 micrometers, and the light reflecting layer is made of vacuum nickel plating films or vacuum aluminum plating films or vacuum silver plating films or polyester films coated by high-reflectivity silver or high-reflectivity multilayer dielectric films. The light reflecting thin film is simple in structure and low in cost, the output power of the assembly is increased, the application method of the light reflecting thin film is compatible with an existing photovoltaic module process, and therefore long-term reliability and the service life of the assembly can not be affected. The output power of the photovoltaic assembly can be increased by 1.5% to 3%, and the light reflecting thin film effectively reduces manufacturing cost of the unit power of the photovoltaic module.

The invention discloses a method for measuring high reflectivity based on self-mixing effect of semiconductor laser which belongs to the technical field of measuring optical elements parameter. The present cavity ringdown technique for determining high reflectivity by measuring ringdown time, using the self-mixing effect of semiconductor laser, improves laser power to coupling efficiency of ringdown cavity by controlling back feedback optical intensity of continuous wave semiconductor laser, greatly improves the signal-noise ratio of cavity outputting signal, thereby improving measuring precision and measuring range of high reflectivity. The methods for controlling back feedback optical intensity which can make the cavity output signal reach the maximum include: inserting a linear polarizer, an attenuation plate, an optical isolator or a variable aperture between the semiconductor laser and the first cavity mirror, or adjusting the pitching of the first cavity mirror, or changing the distance of the laser and the first cavity mirror.

The invention discloses a method for preparing a polymer/silver composite membrane by depositing dopamine, which belongs to the field of surface medication for the polymer. The prior polymer surface metallization art has the problems of long time, bad electric conductivity and the like. The method comprises the following steps of: depositing dopamine on the surface of the polymer membrane under an alkaline condition; arranging the polymer membrane, on which the dopamine is deposited, in silver plating solution; and adding reducer glucose solution into the mixture to prepare the polymer/silver composite membrane with high electric conductivity and high reflectivity. The method has simple and convenient operation, short time and low cost, and is applicable for all shapes and performance of polymer membranes. The prepared composite membrane has excellent electric conductivity and high reflectivity, and is applicable for chemical industry, metallurgy, new materials, microelectronic devices, military industrial technology and life system.

It is an object of the present invention to provide a light-emitting device in which, even when a material with high reflectivity such as aluminum is used for an electrode, a layer containing oxygen can be formed over the electrode without increasing contact resistance and a manufacturing method thereof. According to the present invention, a feature thereof is a light-emitting element having an electrode composed of a stacked structure where a conductive film having high reflectivity such as aluminum, silver, and an alloy containing aluminum or an alloy containing silver, and a conductive film composed of a refractory metal material is provided over the conductive film, or a light-emitting device having the light-emitting element.

A furnace incorporating a novel thermal design is disclosed. Heating element temperature is reduced compared to conventional designs while providing a precisely controllable process temperature in the range 1000-1400 degrees centigrade. A plurality of Kanthal heating elements are arranged in a planar array as close to the work as possible, thus approximating an isothermal condition with respect to the work. The process chamber is made of aluminum and its internal surfaces are highly polished to reflect heat. The chamber walls have built in active cooling to carry away non-reflected heat and preserve high reflectivity. The heating elements are modular to facilitate removal and replacement without disassembly of the furnace. The configuration of the heating elements is linear rather than coiled and the temperature is monitored directly by measuring the electrical resistance of the Kanthal wires.

An optical recording medium of dual layer type is provided which has at least a first substrate, a first recording layer capable of optical recording, a translucent reflecting layer, an intermediate layer, a second recording layer capable of optical recording, and a second substrate in this order from a side where a laser beam for recording, reproduction, or recording/reproduction is applied, wherein the first recording layer is made of an organic dye and the second recording layer is made of a metal material having a higher reflectivity than the organic dye. The optical recording medium provides sufficient signal amplitudes from both recording layers during reproduction, and gives compatibility with a typical optical recording medium during reading.

A durable highly reflective silver mirror characterized by high reflectance in a broad spectral range of about 300 nm in the UV to the far infrared (˜10000 nm), as well as exceptional environmental durability. A high absorptivity metal underlayer is used which prevents the formation of a galvanic cell with a silver layer while increasing the reflectance of the silver layer. Environmentally durable overcoat layers are provided to enhance mechanical and chemical durability and protect the silver layer from corrosion and tarnishing, for use in a wide variety of surroundings or climates, including harsh or extreme environments.

A multi-layer flexible insulation (I) comprises a series of layers which include a pair of closed-cell insulation sheets (10,12) made of multicellular plastic film (i.e. closed cell air bubbles or bubble-pack) and laminated on both sides of a thin white polyethylene film (14), a pair of aluminum foil layers or films (16,18) adhesively mounted on the outer surfaces of the bubble-pack insulation sheets (10,12), and a pair of thin clear polyester layers (20,22) provided on the outer surfaces of the aluminum layers. The aluminum layers (16,18) are vapor deposited on the polyester layers (20,22) and are assembled to the hot bubble-pack insulation sheets (10,12) while the latter are cooled. The bubble-pack sheets (10,12) are then adhered to the central polyethylene film (14) with a hot melt glue. If the polyester (20,22) is highly smooth, the aluminum (16,18) can be deposited thereon in a uniform state thereby providing a high reflectivity, low emissivity, laminate. The outer polyester coatings (20,22) also protect the aluminum layers (16,18) such as to prevent any aluminum from rubbing off the insulation (I) and also prevent the aluminum layers (16,18) from oxidizing. Furthermore, the polyester coatings (20,22) provide an hygiene barrier for the insulation (I).

A composite high reflectivity mirror (CHRM) with at least one relatively smooth interior surface interface. The CHRM includes a composite portion, for example dielectric and metal layers, on a base element. At least one of the internal surfaces is polished to achieve a smooth interface. The polish can be performed on the surface of the base element, on various layers of the composite portion, or both. The resulting smooth interface(s) reflect more of the incident light in an intended direction. The CHRMs may be integrated into light emitting diode (LED) devices to increase optical output efficiency.

A very high-Q, low insertion loss resonator can be achieved by storing many overtone cycles of a lateral acoustic wave (i.e., Lamb wave) in a lithographically defined suspended membrane comprising a low damping resonator material, such as silicon carbide. The high-Q resonator can sets up a Fabry-Perot cavity in a low-damping resonator material using high-reflectivity acoustic end mirrors, which can comprise phononic crystals. The lateral overtone acoustic wave resonator can be electrically transduced by piezoelectric couplers. The resonator Q can be increased without increasing the impedance or insertion loss by storing many cycles or wavelengths in the high-Q resonator material, with much lower damping than the piezoelectric transducer material.

A reflective film used as a reflective electrode or a reflector, comprising an Ag-based alloy containing rare earth metals. The reflective film has high reflectivity and high durability.