45results about How to "Great index of refraction" patented technology

A method of displaying an image with variable perceived depth using a display (1) including one or more at least partially transparent, substantially parallel imaging screens (3) located in front of, and overlapping with, a rear imaging screen (4),characterized in that a physical image is formed on two or more imaging screens (3,4), each image being of substantially identical configuration and being sized and aligned such that like portions of each image are coterminous to a viewer observing the display,wherein at least two of said coterminous images are displayed with different luminance.

A very high transmittance, back-illuminated, silicon-on-thin sapphire-on-fused silica wafer substrate design is presented for enabling high quantum efficiency and high resolution, silicon or silicon-germanium avalanche photodiode detector arrays with improved indirect optical crosstalk suppression. The wafer substrate incorporates a stacked antireflective bilayer between the sapphire and silicon, comprised of single crystal aluminum nitride (AlN) and non-stoichiometric, silicon rich, amorphous silicon nitride (a-SiNX<1.33), as well as a one quarter wavelength, magnesium fluoride (λ / 4-MgF2) back-side antireflective layer which is bonded to a fused silica wafer. The fused silica provides mechanical support, allowing the sapphire to be thinned to optimal thickness below 50 μm, for improved optical transmittance and in conjunction with monolithic sapphire microlenses, suppression of indirect optical crosstalk from multiple reflections of APD emitted light. After solid-state device fabrication, the silicon can be coated with photoresist and the fused silica dissolved in buffered hydrogen fluoride (HF) to recover the thin Si—(AlN / a-SiNX<1.33)-sapphire-(MgF2).

An advanced, very high transmittance, back-illuminated, silicon-on-sapphire wafer substrate design is presented for enabling high quantum efficiency and high resolution, silicon or silicon-germanium avalanche photodiode detector arrays. The wafer substrate incorporates a stacked antireflective bilayer between the sapphire and silicon layers, comprised of single crystal aluminum nitride (AlN) and non-stoichiometric, silicon rich, amorphous silicon nitride (a-SiNX<1.33), that provides optimal refractive index matching between sapphire and silicon. A one quarter wavelength, magnesium fluoride (λ / 4-MgF2) antireflective layer deposited on the back surface of the thinned sapphire provides refractive index matching at the air-sapphire interface. Selecting a composition of x=0.62 for a-SiNX, tunes an optimal refractive index for the layer. Selecting design thicknesses of 52 nm for single crystal AlN, 30 nm for a-SiN0.62, and 120 nm for λ / 4-MgF2 yields a back-illuminated optical transmittance T>50% for 250-300 nm, T>70% for 300-400 nm and T>90% for 400-1100 nm.

A process for producing a polythiourethane resin which comprises (A) a step of synthesizing a polythiol oligomer having disulfide bond by reaction of a polythiol compound having a functionality of two or greater and sulfur and (B) a step of bringing the polythiol oligomer obtained in step (A) and a compound having poly(thio)isocyanate groups into reaction with each other, wherein step (A) is conducted in the absence of solvents using no catalysts or a catalyst substantially inert to the compound having poly(thio)isocyanate groups. A polythiol oligomer exhibiting a greater refractive index than that of the polythiol compound having a functionality of two or greater used as the starting material is produced at a low cost, and a process for producing a practically useful polythiourethane resin exhibiting a stable great refractive index and a great Abbe number is provided.

The present invention is to provide a curable resin composition that is desirably used for manufacturing an optical part, in particular, an optical waveguide, that is superior in heat-resistant properties such as a heat-resistant decomposing property and a coloring-resistant property, and has its refractive index precisely controlled.The present invention provides a curable resin composition, comprising:(A) a monomer that contains a polycyclic alicyclic hydrocarbon skeleton and two or more terminal radical polymerizable groups,(B) a monomer that contains a perfluoroalkylene skeleton and two or more terminal radical polymerizable groups, and(C) a photopolymerization initiator and / or a thermal polymerization initiator.The present also provides an optical part, in particular, an optical waveguide, formed by photo-and / or thermo-curing the above curable resin composition.

A radar apparatus has a light receiver that includes a refractive body and a mirror on an opposite surface of the refractive body relative to an incidence surface of the refractive body for receiving an incident light from an outside of the radar apparatus. The refractive angle of the refractive body is configured to be smaller than an incident angle of the incident light, and the mirror is configured to reflect at least a portion of the incident light toward a first light receiving element that is disposed on the incidence surface with its light receiving face facing the incidence surface of the refractive body.

The method for producing a plastic lens of the present invention comprises forming a hard coat film by coating a plastic substrate with a coating composition comprising (A) modified colloid particles of a stannic oxide-zirconium oxide composite having diameters of 4.5 to 60 nm which are formed by coating the surface of nuclei with colloid particles of a tungsten oxide-stannic oxide-silicon dioxide composite having diameters of 2 to 7 nm, a ratio of amounts by weight of WO3 / SnO2 of 0.1 to 100 and a ratio of amounts by weight of SiO2 / SnO2 of 0.1 to 100 using as the nuclei colloid particles of a stannic oxide-zirconium oxide composite having diameters of 4 to 50 nm and a structure formed by bonding colloid particles of stannic oxide obtained by reaction of metallic tin, an organic acid and hydrogen peroxide and colloid particles of zirconium oxide to each other in amounts such that a ratio of amounts by weight of the oxides of ZrO2 / SnO2 is 0.02 to 1.0 and (B) an organosilicon compound. The method provides a plastic lens having a hard coat film exhibiting improved scratch resistance and a great refractive index without adverse effects on various properties such as the property of preventing yellowing under irradiation with ultraviolet light and adhesion.

Embodiments are directed to glass frits containing phosphors that can be used in LED lighting devices and for methods associated therewith for making the phosphor containing glass frit and their use in glass articles, for example, LED devices.

A radar apparatus has a light receiver that includes a refractive body and a mirror on an opposite surface of the refractive body relative to an incidence surface of the refractive body for receiving an incident light from an outside of the radar apparatus. The refractive angle of the refractive body is configured to be smaller than an incident angle of the incident light, and the mirror is configured to reflect at least a portion of the incident light toward a first light receiving element that is disposed on the incidence surface with its light receiving face facing the incidence surface of the refractive body.

According to the present invention, sufficient light trapping effect can be exhibited and series resistance can be kept small, by sequentially forming a silicon based low refractive index layer and a thin silicon based interface layer on a backside of a photoelectric conversion layer observed from a light incident side, and as a result a silicon based thin film solar cell may be provided efficiently and at low cost.

A side-view light emitting laser element includes a support substrate, a first electrode layer, a second electrode layer, and a light emitting multilayer unit sandwiched between the first electrode layer and the second electrode layer. The first electrode layer is disposed on the support substrate. The second electrode layer is disposed on the first electrode layer. The light emitting multilayer unit includes a first semiconductor layer, a second semiconductor layer and an activating layer sandwiched between the first semiconductor layer and the second semiconductor layer. A first refractive index of the first electrode layer and a second refractive index of the second electrode layer are between 1 and 0, respectively.

The present invention relates to a coating composition containing metal oxide particles with a high refractive index and low photocatalytic activity and a coating film obtained by applying the coating composition onto a substrate. The coating composition contains metal oxide particles with a high refractive index obtained by coating the specific fine particles of the titanium-based oxide on their surfaces with at least a silica-based oxide or a silica-based composite oxide, and the coating film is obtained by applying the coating composition onto a substrate. The metal oxide particles with not only a high refractive index but also low photocatalytic activity, and therefore a coating film with excellent weathering resistance and light resistance can be formed on a substrate.

A process for producing a polythiourethane resin which comprises (A) a step of synthesizing a polythiol oligomer having disulfide bond by reaction of a polythiol compound having a functionality of two or greater and sulfur and (B) a step of bringing the polythiol oligomer obtained in step (A) and a compound having poly(thio)isocyanate groups into reaction with each other, wherein step (A) is conducted in the absence of solvents using no catalysts or a catalyst substantially inert to the compound having poly(thio)isocyanate groups. A polythiol oligomer exhibiting a greater refractive index than that of the polythiol compound having a functionality of two or greater used as the starting material is produced at a low cost, and a process for producing a practically useful polythiourethane resin exhibiting a stable great refractive index and a great Abbe number is provided.

A grazing incidence interferometer includes: a beam splitting section configured to split a beam from a beam source section into a measuring beam emergent to a measurement surface and a reference beam serving as a measurement reference, and configured to cause the measuring beam to emerge obliquely to the measurement surface; a beam combining part configured to combine the reference beam and the measuring beam reflected at the measurement surface, to obtain a combined beam; a detecting section configured to detect a profile of the measurement surface based on an interference fringe formed by the combined beam; and an image inverting part configured to invert an orientation of a wave front of the measuring beam or the reference beam, the image inverting part being provided in an optical path of the measuring beam or the reference beam leading from the beam splitting section to the beam combining section.