195results about How to "Avoid light loss" patented technology

The invention provides an LED package and a backlight device incorporating the LED lens. The LED package has a bottom surface and a light exiting surface cylindrically extended around a central axis of the package from the bottom surface. Also, a reflecting surface is positioned on an opposite side of the bottom surface and symmetrical around the central axis such that light incident from the bottom surface is reflected toward the light exiting surface. Further, a scattering area is formed on the reflecting surface. According to the invention, by applying scattering materials on the reflecting surface of the LED package, a reflecting paper does not need to be attached, thereby simplifying a process and reducing the manufacture time and cost.

The present invention provides scintillation material having good stability at continuous operating temperatures of at least 175° C. The scintillation material includes a cross linked copolymer with improved aromatic character that form a host plastic having properties of a thermoset polymer. The host plastic contains a primary fluorescent agent and a wavelength shifter. Preferably, the copolymer is comprised of a styrene derivative such as, for example, p-t-butylstyrene, and a higher melting point compound such as, for example, 4-vinylbiphenyl. In accordance with one aspect of the present invention, the scintillation material possesses properties of: good mechanical properties at high temperature (e.g., a Tg of about 180° C.); excellent light output (e.g., energy transfer efficiency); high hydrogen content for fast neutron detection; good optical transparency; and stable operation at temperature.

Disclosed are a method and structure providing a silicon-on-insulator substrate on which photonic devices are formed and in which a core material of a waveguide is optically decoupled from a support substrate by a shallow trench isolation region.

A non-polar light emitting diode (LED) having a photonic crystal structure and a method of fabricating the same. A non-polar LED includes a support substrate, a lower semiconductor layer positioned on the support substrate, an upper semiconductor layer positioned over the lower semiconductor layer, a non-polar active region positioned between the lower and upper semiconductor layers, and a photonic crystal structure embedded in the lower semiconductor layer. The photonic crystal structure embedded in the lower semiconductor layer may improve the light emitting efficiency by preventing the loss of light in the semiconductor layer, and the photonic crystal structure is used to improve the polarization ratio of the non-polar LED.

A manufacturing method of a laser-ablated fiber device is proposed. The fiber cladding is removed by laser beam until the evanescent field is accessed. The depth of ablation is controlled by measuring the distance between the interference fringes of the laser. The effective interaction length is tuned by varying the radius of curvature of the fiber. The ablated fibers are mated to act as a fiber coupler. Subsequently, the interaction region is fused or fused-tapered to make a fiber coupler, an add / drop multiplexer, a fiber filter, etc.

The present invention provides a projection type image display device which is corresponding with the requirement of wide angle. The projection type image display device can reduce the deterioration of imaging capability and the reflection at the surface and is provided with a small-size cover plate. A refractive optical surface (40b) of the amplifying side of concavo-convex lens (41) at the amplifying side is provided with a convex surface shape projected to the amplifying side, so the second refractive optical part (40) can function as a protecting cover of projection optical system (50) when the projection is executed with a wide visual angle. Thus the thickness of concavo-convex lens (41) is approximately uniform, and furthermore the concavo-convex lens (41) is set to a convex surface shape projected to the amplifying side, so the surface area as protecting cover can be reduced, and the effect to imaging can be reduced. Additionally, as the concavo-convex lens (41) is formed to a concentric sphere shaped dome that the curvature center of lens surface is collocated adjacently to the position of exit pupil of reflective optical part (30), the effect caused by the concavo-convex lens (41) to the imaging effect can be reduced.

The invention relates to a method for manufacturing a high-luminous-efficacy focusing solar Fresnel lens. The method comprises the following five steps of: 1, improving a ripple surface, wherein a vertical surface (15) of each ripple is changed into an inner inclined surface (9); an inclination angle of an intersection between the inner inclined surface (9) and a bottom surface (2) is reduced along with the increasing of a vertical distance between the intersection and a central optical axis (7); the degree di of each inclination angle can be calculated by an inverse trigonometric function; and a ripple bottom is changed into a narrow flat bottom; 2, selecting flat-panel quartz glass and silica gel as materials; 3, changing a single-layer mirror body into a glass and silica gel double-layer compound mirror body; 4, moulding; and 5, treating the surface of glass, performing rubber injection and compound forming, trimming the edge and inspecting so as to manufacture the improved Fresnellens. The lens manufactured by the method has high luminous efficacy, a low light precision requirement, high light transmission performance and anti-aging performance, low manufacturing cost and long service life. The compound lens has high material performance complementarity; furthermore, the processing difficulty of the die and the mirror body is reduced; and the service life of the die is prolonged.

The invention relates to a method for processing refractory organic wastewater through a TIO2 membrane electrode photoelectric rotating disk. A TIO2 photocatalyst is loaded in a base through the direct thermal oxidation method or the sol-gel method, and is fixed on a rotating shaft in a single-chip mode or a multichip series mode to form the photoelectric rotating disk, which is used as a photo anode and is positioned into a semi arc reaction groove, one half of the photo anode is immersed into wastewater, a Cu sheet is used as a cathode, and the photo anode and the cathode are respectively connected with the positive electrode and the negative electrode of a power supply. The voltage of the direct current power supply is adjusted, and a motor is started and the rotating speed of the photo anode is controlled through a speed controller to form a layer of liquid membrane on the surface of the photo anode. An ultraviolet lamp or sunlight is used as an excitation light source, the excitation light source can illuminate the surface of the photo anode catalyser only by penetrating the liquid membrane, the absorption of organic wastewater to light is greatly reduced, the utilization of the excitation light source and the photoelectricity catalyzing degrading efficiency are enhanced, and meanwhile the exchanging and updating of the liquor substances on the surface of the electrode and in the main body are accelerated through the rotation of the rotating disk, the mass transfer is strengthened, and the degrading efficiency is enhanced.

A miniaturized linear light source sub-module comprising a symmetrical lens array, a light guide bar with dual reflecting surfaces, at least one light emitting diode light source, and a sub-module housing is disclosed. The symmetrical lens array comprises two identical covers, two identical lens sections, and a middle holder. Each lens section comprises a plurality of lenses disposed on the top and bottom of the lens section. The dual reflecting surface light guide comprises a light emitting surface, a v-shaped light reflecting surface, an asymmetrical saw-toothed light reflecting surface, an apex cut-off surface, and a bottom cut-off surface. At least one light emitting diode light source is connected to an end of the dual reflecting surface light guide. The sub-module housing holds the lens array assembly, the dual reflecting surface light guide, and the at least one light emitting diode light source to form the miniaturized linear light source sub-module.

A flip-chip LED fabrication method includes the steps of (a) providing a GaN epitaxial wafer, (b) forming a first groove in the GaN epitaxial layer, (c) forming a second groove in the GaN epitaxial layer to expose a part of the N-type GaN ohmic contact layer of the GaN epitaxial layer, (d) forming a translucent conducting layer on the epitaxial layer, (e) forming a P-type electrode pad and an N-type electrode pad on the translucent conducting layer, (f) forming a first isolation protection layer on the P-type electrode pad, the N-type electrode pad, the first groove and the second groove, (g) forming a metallic reflection layer on the first isolation protection layer, (h) forming a second isolation protection layer on the first isolation protection layer and the metallic reflection layer, (i) forming a third groove to expose one lateral side of the N-type electrode pad, (j) separating the processed GaN epitaxial wafer into individual GaN LED chips, and (k) bonding at least one individual GaN LED chip thus obtained to a thermal substrate with a conducting material.

An LED lighting device with light converging effect has a circuit board with multiple LEDs, a light converging base and a cover. The light converging base is securely connected to the circuit board and has multiple reflecting cavities defined in the light converging base. Each reflecting cavity has a bore defined in a bottom of the reflecting cavity and corresponding to and receiving one of the LEDs. Each cavity has a depth larger than a length of the corresponding LED. The cover is combined with the light converging base to enclose the LEDs.

The invention discloses a sunlight lead-in daylighting device, which comprises a light detector, a signal processing part, a lead-in optical fiber part and a mechanical transmission part for driving, which are assembled together, wherein the light detector comprises a fine tracking sensor, a coarse tracking sensor and a small diameter lens arranged in the center of the top of the detector; the coarse tracking sensor consists of four sensitive silicon photocells or photoresistors, which are distributed on four vertexes of an inscribed square of the top of the detector and take the top center of the detector as the center of a circle, and form 45-degree included angles against the top plane of the detector; the fine tracking sensor is a 4-quadrant detector; and the distance between the small diameter lens and the 4-quadrant detector is slightly smaller than the focal distance of the lens. The device utilizes a full photoelectric tracking mode to realize the wide-range, high-precision and cheap focus tracking of sunlight so as to realize the daylighting.

A light guide panel usable with a backlight unit is capable of enhancing brightness uniformity and reducing light loss. The light guide panel includes a transparent plate one side of which is a plane of incidence. An interior of the light guide panel is divided by a plurality of planes inclined with respect to the plane of incidence, and each of the respective inclined planes is partial-reflection-coated.

The present disclosure relates to a device for modulating light emitted by a laser, including an optical substrate that has an electro-optical effect, at least one optical waveguide formed near a front face of the optical substrate, a first electrode that is formed with a conductive transparent film so that a part of the optical waveguide may be covered and is used for applying an electric field to the optical waveguide, a second electrode that is paired with the first electrode and is used for applying an electric field to the optical waveguide, and a third electrode that is formed with a metal film in a position that is shifted from a position just above the optical waveguide and is electrically connected with the first electrode.