85 results about "Scotophor" patented technology

A first aspect of the invention relates to a luminescent object comprising an aligned polymer that contains an oriented photoluminescent material, said aligned polymer having a pretilt angle of 10-90°. The luminescent object according to the present invention may advantageously be employed in luminescent solar concentrator systems as it enables highly efficient transportation of radiation emitted by the photoluminescent material following exposure to incident solar light. Another aspect of the invention concerns a photovoltaic device comprising an electromagnetic radiation collection medium containing the aforementioned luminescent object and a photovoltaic cell capable of converting optical radiation to electrical energy which is optically coupled to the luminescent object. Further aspects of the invention include a fluorescent light activated display and a room lighting system comprising the aforementioned luminescent object.

A combination light and sound producing fixture and combination screw-in light with speakers element is disclosed where the fixture is installed in a wall or ceiling or on a wall or ceiling. The light bulb/speaker can be screwed or secured into a standard light bulb socket. The sound producing elements is a coaxial arrangement of speakers having a low frequency transducer and one or more high frequency transducers that can be directed to emit sound in a particular direction. The fixture or bulb may further include digital signal processing to modify the sound to account for obstructions in or near the fixture. The surface of the sound transducer can be reflective in nature to provide focusing or diffusion of the light from the lighting elements. The lighting elements are incandescent, fluorescent or low voltage LED type that may include adjustment for lighting intensity and color.

Systems, devices and methods of the present invention are for viewing a pattern of fluorophors capable of fluorescing when exposed to visible light, e.g., fluorescently stained DNA, protein or other biological material. The system includes a light source emitting light in the visible spectrum, such as a fluorescent lamp used in domestic lighting, a first optical filter capable of transmitting light from the source at wavelengths capable of exciting the fluorophors and of absorbing light of other wavelengths, and a second optical filter capable of blocking substantially all the light from the source not blocked by the first filter, so that the only light reaching the viewer is light produced by fluorescence of the fluorophors.

A cold cathode fluorescent lamp includes a glass bulb (16), a protective film (22) formed on an inner face of the glass bulb, and a phosphor layer (24) that overlaps the protective film and that contains blue phosphor particles (26B), green phosphor particles (26) and red phosphor particles (26). The glass bulb has been formed from soda glass, and the blue phosphor particles have been coated with a metal oxide (30). Also, the protective film is made of silica (SiO₂). Since the protective film has been provided in the fluorescent lamp and since the blue phosphor particles, which readily deteriorate, have been coated with the metal oxide, a good luminance maintenance rate is obtained. In addition, although the glass bulb of the fluorescent lamp is made of soda glass, since the protective film is made of silica, the fluorescent lamp obtains an initial luminance equivalent to the initial luminance of a fluorescent lamp whose glass bulb is made of borosilicate glass.

For preventing a luminance drop of a liquid crystal display panel comprising a liquid crystal display panel, a driver circuit of driving the liquid crystal panel, and a luminance having a fluorescent lamp as one of elements thereof, the present invention provides a heat retaining means for an electrode portion of the fluorescent lamp, and suppresses heat radiation at the electrode portion of the fluorescent lamp so as to secure sufficient amount of mercuric vapor in the whole of the fluorescent lamp.

This invention relates to a sol-gel method for preparing red fluorescent powder used in light emitting diode. The chemical formula of the red fluorescent powder is R2-x-yEuxAy(MO4)3, wherein x is within 0-2; R is one or more of Sc, Y, La, Gd and Lu; A is one or two of Sm and Bi; y is within 0-0.3; M is one or two of Mo and W. The red fluorescent powder has an average particle size less than 2 mu.m, a main emission peak of 616 nm, and a synthesis temperature of 650-1000 deg.C. The red fluorescent powder has strong excitation absorption at 370-500 nm near-UV wave band and blue light wave band, high luminescence intensity, high color purity and high stability. The sol-gel method utilizes citric acid as the complexing agent to prepare high-brightness red fluorescent powder, the reaction temperature is largely lower than that of the solid phase method, and the obtained red fluorescent powder has small and uniform sizes, spherical particle shape, high purity, high quantum efficiency, and good luminescent property, and can be used in light emitting diode and fluorescent lamp excited by near-UV and blue light.

The present invention discloses a phosphate or metaphosphate based visible-ultraviolet up-conversion luminescence material doped with rare earth ions, wherein phosphate or metaphosphate serves as a substrate, and the substrate material is doped with Pr<3+>; a molar ratio of phosphate or metaphosphate to Pr<3+> is (0.9-3):(0.01-0.1). The present invention further provides a preparation process of the material, comprising: (a) according to the chemical formula, weighing oxide materials of corresponding elements and ammonium dihydrogen phosphate according to a stoichiometric ratio; and (b) grinding the weighed materials, burning the ground materials at the temperature of 850 to 950 DEG C for 2.5-4 h, cooling the materials to the room temperature, and grinding the materials to obtain a powder-like up-conversion luminescence material. It is experimentally proved that when excited by a common light source (such as an incandescent lamp, an xenon lamp, a fluorescent lamp and an LED lamp), especially by sunlight, the material can emit ultraviolet light UVC that can effectively kill bacteria; and the material has a broad application prospect in the fields of food safety and environmental protection.

The invention provides fluorescent light, light-accumulation fluorescent light, lighting device and light-accumulation lighting device whose luminescence property is perfect. Firstly, the shortwave ultraviolet radiation (254nm) generated by the fluorescent light inspires long wave ultraviolet radiation or purple luminescence material, then the light omitted by the long wave ultraviolet radiation or purple luminescence material inspires other luminescence material to obtain fluorescent light, light-accumulation fluorescent light, lighting device and light-accumulation lighting device whose luminescence efficiency is high, coloration is good, color range is wide.

An image pickup system includes photodiodes with color filters. A first color filter group includes visual light color filters, and a second color filter group includes a long red color filter at 640 nm or longer or a color filter at 580 nm and one of the visual light color filters. An infrared cut filter covers all the filters. A control circuit includes a fluorescent lamp distinguishing circuit for distinguishing a fluorescent lamp from other illuminating light sources by a ratio of an output signal from the photodiode with the long red filter to an output signal from the photodiodes with the visual light color filters; and a white balance control circuit for adjusting a white balance so as to match the illuminating light source distinguished by the fluorescent lamp distinguishing circuit.

A surface light source device has a narrowed visual field and increased brightness. The surface light source device can be applied to a liquid crystal display. The back side of a fluorescent lamp is covered with silver foil. Light emitted from the lamp enters a wedge-shaped light guide plate through its incident surface. The light guide plate is designed so that directional light exits from the guide plate. When the light is guided toward a thin-walled end surface through the light guide plate, the light is scattered, reflected, and undergoes other action. Collimated light flux gradually exits from the exiting surface. The light flux passes through two prism sheets successively. As a result, the direction of propagation of the light is restricted in two dimensions. The light flux of increased brightness is directed to the liquid crystal panel. V-shaped channels formed in the prism faces of the two prism sheets PS1, PS2 are arrayed in two mutually perpendicular directions while facing outward. The prismatic vertical angles of the two sheets PS1, PS2 have various desirable combinations of values. For example, where the first sheet PS1 is disposed vertical to the lamp, the vertical angles of the two sheets PS1, PS2 are preferably 90° and 70°, respectively.

A LCD panel is illuminated from its back side by a surface light source device of side light type comprising a guide plate, a primary light source (fluorescent lamp and reflector), a reflection sheet and a prism sheet as a light control member. Light scattering pattern and rough area M are foxed on an emission face of the guide plate. The light scattering pattern consists of a great number of fine light scattering elements. The rough area M is formed among the light scattering elements and has scattering power which is weaker than that of the light scattering elements. The dot-like light scattering elements are distributed according to a certain pattern. This pattern is designed depending on necessity of promotion of emitting. Emitting is promoted in not only portions where the light scattering elements are formed but also in the area M among them. Accordingly, fine periodic bright-dark unevenness and glaring are hard to appear. And even when an additional member such as prism sheet is disposed directly on the emission face, the additional member is prevented from sticking to the emission face. The rough area M has roughness practically falling within a range from 0. 02 to 0.25 mum.

Four straight tube type Cold Cathode Fluorescent Lamps are placed such that the distance from the two inner Cold Cathode Fluorescent Lamps to a reflection surface of a reflector plate is shorter than the distance from the two outer Cold Cathode Fluorescent Lamps to the reflection surface of the reflector plate, whereby it becomes possible to make the distance from the two inner Cold Cathode Fluorescent Lamps to a liquid crystal panel longer than the distance from the two outer Cold Cathode Fluorescent Lamps to the liquid crystal panel. Generally, unevenness in brightness on the display screen is caused by higher brightness in the vicinity of each of the Cold Cathode Fluorescent Lamps. Accordingly, by making longer the distance from the two inner Cold Cathode Fluorescent Lamps to the liquid crystal panel, it becomes possible to prevent unevenness in brightness at a central portion of the display screen, which is more likely to be noticed by users, thereby improving the image quality of the liquid crystal display device.

The invention discloses a white light luminescent alkali metal rare earth tetrametaphosphate luminescent material used for non-mercury discharge fluorescent lamp, in which the chemical composition expression is M(RE1-xDyx)(PO3)4. M chosen from Li<+>, Na<+>, K<+>, Rb<+> and Cs<+> is the alkali metal ion. RE chosen from La, Gd, Y and Lu is the rare earth element. Dy<3+> (trivalent rare earth dysprosium ion) is the active ion and x in which the value range is that 0.005 is less than or equal to x and the x is less than or equal to 0.50 is the molar content of the active ion (dysprosium ion) corresponding to the rare earth mental ion. The luminescent material has the strong absorption within the vacuum ultraviolet band; meanwhile, the rare earth dysprosium ion emits the white light under the activation of the vacuum ultraviolet light. The invention also discloses a preparation method of the luminescent material with simple preparation procedure. The prepared luminescent material emits the white light of the best purity with proper color coordinate which is suitable for the non-mercury discharge fluorescent lamp.

A fluorescent lamp 6 emits illumination light (primary light), which is deflected by means of a light guide plate 4 to be converted into a light flux having an enlarged cross section. A liquid crystal display panel 3 is supplied with the light flux via a prism sheet (light control sheet) 12. The prism sheet 12 or an alternative light control sheet to be employed is capable of rotating polarization involved by the light toward a direction of light transmission axis of a polarization plate 14. An effective light input to the liquid crystal display panel 3 is achieved by light transmission through the polarization plate 14 at a high transmission rate. The liquid crystal display panel 3 controls polarization state of the inputted light and, according to the state, causes the light to pass through another polarization plate (analyser) 15. Emission occurs, under intensity control depending on positions, via the polarization plate (analyzer) 15, to provide an image. Polarization rotation function for modifying the emission of the light guide plate 4 can be obtained through manufacturing of a mother material of the prism sheet 12 by means of one-axle drawing process or two-axle drawing process. Prism cuts may be formed on a back face 8 or emission face 11 of the light guide plate 4. A polarization-rotating sheet may be alternatively interposed between a prism sheet provided with no polarization-rotating ability and the polarization plate 14.

A radiological image detection apparatus includes: a first scintillator and a second scintillator that emit fluorescent lights in response to irradiation of radiation; and a first photodetector and a second photodetector that detect the fluorescent lights; in which the first photodetector, the first scintillator, the second photodetector, and the second scintillator are arranged in order from a radiation incident side, and a high activator density region in which an activator density is relatively higher than an average activator density in a concerned scintillator is provided to at least one of the first scintillator located in vicinity of the first photodetector and the second scintillator located in vicinity of the second photodetector.

Disclosed is a fluorescent lamp having a phosphor layer formed on the inner wall of a lamp tube. The average particle size of the phosphors used in the phosphor layer is not more than 1 μm, and the thickness of the phosphor layer is not more than 5 μm. By having such a constitution, the ultraviolet light having a wavelength of 254 nm which is emitted from mercury sealed within the lamp tube can be efficiently converted into visible light and the visible light can be efficiently discharged outside the lamp tube.

The problem to be solved by the present invention is to provide a light diffuser plate and a process for production thereof, which light diffuser plate can diffuse light selectively in any desired direction even when the number of cold cathode fluorescent lamps as backlights is reduced and the gap between cold cathode fluorescent lamps is increased, so suppressing luminance unevenness and lamp image with good repeatability in stable way and maintaining high luminance. The present invention is also aimed at providing a backlight unit that possesses similar characteristics. The light diffuser plate of the present invention is characterized in comprising a light diffusion layer containing a thermoplastic resin and a crosslinked organic fine particle dispersed in the thermoplastic resin, and a cylindrical lens array on at least one side; wherein a refractive index of the crosslinked organic fine particle is different from a refractive index of the thermoplastic resin; a crosslink density defined by the formula (1) of a polymer constituting the crosslinked organic fine particle is within the predetermined range; an aspect ratio of the crosslinked organic fine particle is more than 1; and a major-axis direction of the crosslinked organic fine particle and a length direction of the cylindrical lenses are the same.

The invention provides a laminate for name plate preparation that is free from distortion (fluctuation) in reflected light and has a high level of design. The laminate for name plate preparation is a laminate having metallic luster, comprising a transparent substrate (1) and a pressure-sensitive adhesive layer (2) and a metal deposited film (3) provided in that order on the backside of the transparent substrate (1). The metal deposited film (3) comprises a metal deposition layer (5) provided on the surface side of a transparent resin film (4), and, at the same time, the thickness of the transparent resin film (4) was specified to not less than 175 m and not more than 300 m. Specifying the thickness of the transparent resin film (4) located on the backside of the metal deposition layer (5) can eliminate the occurrence of distortion (fluctuation) of reflected light and, when a person sees a reflected image of a fluorescent lamp, can render pockmarks like orange peel unseenable.