7684results about How to "Good optical performance" patented technology

Optical systems such as image display systems include a freeform optical waveguide prism and a freeform compensation lens spaced therefrom by a gap of air or index cement. The compensation lens corrects for aberrations which the optical waveguide prism will introduce in light or images from an ambient real-world environment. The optical waveguide prism receives actively projected images at an entry location, and emits the projected images at an exit location after internally reflecting the images along an optical path therein. The image display system may include an image source and coupling optics. The approach permits design of an optical viewing device, for example in optical see-through HMDs, achieving an eyeglass-form appearance and a wide see-through field of view (FOV).

An electro-optic display comprises first and second substrates and a lamination adhesive layer and a layer of a solid electro-optic material disposed between the first and second substrates, the lamination adhesive layer having a volume resistivity, measured at 10° C., which does not change by a factor of more than about 3 after being held at 25° C. and 45 percent relative humidity for 1000 hours. The electro-optic material is preferably an encapsulated electrophoretic material. Other desirable characteristics of lamination adhesives for use in electro-optic displays are also described.

An electro-optic display comprises first and second substrates and a lamination adhesive layer and a layer of a solid electro-optic material disposed between the first and second substrates, the lamination adhesive layer having a volume resistivity, measured at 10° C., which does not change by a factor of more than about 3 after being held at 25° C. and 45 percent relative humidity for 1000 hours. The electro-optic material is preferably an encapsulated electrophoretic material. Other desirable characteristics of lamination adhesives for use in electro-optic displays are also described.

The focal distance can be greatly changed by performing an electrical control in an optical element. The optical element comprises a first substrate having a first electrode, a second substrate, a second electrode arranged outside the second substrate, and a liquid crystal layer provided between the first substrate and the second substrate and constituted by liquid crystal molecules oriented. A first voltage is applied between the first electrode and the second electrode, thereby controlling the orientation of the liquid crystal molecules, whereby the optical element operates. A third electrode is provided on an insulating layer and outside the second electrode. A second voltage independent of the first voltage is applied to the third electrode, thereby changing the optical properties.

The invention provides a manufacture method for polarization maintaining fiber and a polarization maintaining fiber, and relates to optical waveguide fibers in the field of fiber-optical communication and fiber optical sensors. The method comprises the following steps that: (1) two oppositely arranged open slots with a same shape are inwardly provided at a side surface of a glass mother rod, stress rods are machined to obtain a shape matching the open slots, and the centers of the cross sections of the two open slots and the center of circle in the cross section of the glass mother rod are in a same line; (2) the stress rods are respectively inserted into each open slot on the glass mother rod, and the assembled glass mother rod and stress rods are put in a cannula to form a preformed rod of the polarization maintaining fiber; (3) the preformed rod of the polarization maintaining fiber is drew to form the polarization maintaining fiber. According to the invention, the glass mother rod is provided with the open slots, and the stress rods are embedded in the open slots, thereby obtaining high process repeatability; inner surfaces of the open slots have high fineness, and the open slots have good symmetry, thereby improving processing efficiency; therefore, the optical performance and reliability of the polarization maintaining fiber are substantially improved.

A vertical cavity surface emitting laser (VCSEL) is described using a sub-wavelength grating (SWG) structure that has a very broad reflection spectrum and very high reflectivity. The grating comprises segments of high and low refractive index materials with an index differential between the high and low index materials. By way of example, a SWG reflective structure is disposed over a low index cavity region and above another reflective layer (either SWG or DBR). In one embodiment, the SWG structure is movable, such as according to MEMS techniques, in relation to the opposing reflector to provide wavelength selective tuning. The SWG-VCSEL design is scalable to form the optical cavities for a range of SWG-VCSELs at different wavelengths, and wavelength ranges.

A light-emitting diode with no fluctuations in optical properties and good sealing properties, and a simple production method for producing this light-emitting diode. The light-emitting diode has a base comprising a cup part on which the light-emitting diode is placed, a resin material introduced into cup part, and a lens member placed on top of a cup for focusing light emitted by a light-emitting diode chip. A layer of fluorescent material, which converts the wavelength of at least some of the light from the light-emitting diode chip, is applied to the inner convex face of the lens member. When the lens member is attached to the base, the inner convex face deforms the resin material and air and excess resin material can be pushed to the outside.

A transparent conductive laminated body comprising a transparent dielectric substance thin film having two layers and furthermore a transparent conductive thin film being formed on one face of a transparent film substrate with thickness of 2 to 120 mum, and a transparent substrate being adhered on another face of the film substrate through a transparent pressure sensitive adhesive layer, wherein a relationship of n3<n1<=n2 <n4 is satisfied where a light index of refraction of the film substrate is defined as n1, a light indexes of refraction of the two layers of the dielectric substance thin films are defined as n2 and n3 from the film substrate side respectively, and a light index of refraction of the conductive thin film is defined as n4 is excellent in transparency and scratch-proof property of the conductive thin film, and, moreover, excellent also in flexibility. A touch panel using the transparent conductive laminated body concerned has an improved dotting property.

A near eye or heads up display system includes a scan beam projector engine, an optical waveguide, and an exit pupil expander (EPE) optically coupled between the scan beam projector engine and the optical waveguide. The EPE improves the optical performance of the display system. The EPE could include a diffusive optical element, diffractive optical element, micro-lens array (MLA), or relay of aspherical lenses. A dual MLA EPE may have cells that prevent cross-talk between adjacent pixels. A dual MLA EPE may have a non-periodic lens array. The optical power of one MLA may be different from the other MLA.

A light emitting element having a recess-protrusion structure on a substrate is provided. A semiconductor light emitting element 100 has a light emitting structure of a semiconductor 20 on a first main surface of a substrate 10. The first main surface of the substrate 10 has substrate protrusion portion 11, the bottom surface 14 of each protrusion is wider than the top surface 13 thereof in a cross-section, or the top surface 13 is included in the bottom surface 14 in a top view of the substrate. The bottom surface 14 has an approximately polygonal shape, and the top surface 13 has an approximately circular or polygonal shape with more sides than that of the bottom surface 14.

A single-mode optical fiber includes a central core, an intermediate cladding, a depressed trench, and an external optical cladding. The central core has a radius r1 and a positive refractive index difference Δn1 with the optical cladding. The intermediate cladding has a radius r2 and a refractive index difference Δn2 with the optical cladding, wherein Δn2 is less than the central core's refractive index difference Δn1. The depressed trench has a radius r3 and a negative index difference Δn3 with the optical cladding. The optical fiber has a nominal mode field diameter (MFD) between 8.6 microns and 9.5 microns at a wavelength of nanometers, and at a wavelength of 1550 nanometers, the optical fiber has bending losses less than 0.15 dB / turn for a radius of curvature of 5 millimeters and cable cut-off wavelengths of less than or equal to nanometers.

The present invention provides a multilayer sheet comprising a polymeric film having on a first major side a cross-linked polyurethane layer, the major part of said cross-linked polyurethane layer comprising a polycarbonate based polyurethane containing acid groups and cross-linked with a cross-linker, the polycarbonate-based polyurethane comprising the reaction product of a polycarbonate polyol or a polycarbonate polyamine and an aliphatic polyisocyanate and the uncross-linked polycarbonate-based polyurethane having a Koenig hardness of at least 150 seconds.

A microresonator is provided that incorporates a composite material comprising a polymer matrix and nanoparticles dispersed therein. The microresonator includes the composite material having a shape that is bounded at least in part by a reflecting surface. The shape of the microresonator allows a discrete electromagnetic frequency to set up a standing wave mode. Advantageously, the polymer matrix comprises at least one halogenated polymer and the dispersed nanoparticles comprise an outer coating layer, which may also comprise a halogenated polymer. Methods for making composite materials and microresonators are also provided. Applications include, for example, active and passive switches, add / drop filters, modulators, isolators, and integrated optical switch array circuits.

A process for the production of a propylene based polymer, the process comprising the following steps: (a) a first polymerization stage comprising homopolymerizing propylene or copolymerizing propylene and at least one alpha-olefin in the presence of an alpha-olefin polymerization catalyst whereby to produce a polypropylene component; (b) a second polymerization stage comprising copolymerizing ethylene and at least one alpha-olefin in the presence of an alpha-olefin polymerization catalyst whereby to produce an ethylene / alpha-olefin copolymer component; and (c) blending the polymer components produced in steps (a) and (b) whereby to produce a polymer blend, wherein the first and second polymerization stages are effected in separate polymerization reactors connected in parallel. Also provided are polymer compositions comprising: (i) 30 to 97% by weight, based on the total weight of the polymer composition, of a propylene based polymer; and (ii) 3 to 70% by weight, preferably 5 to 20% by weight, based on the total weight of the polymer composition, of an ethylene copolymer plastomer (e.g., an ethylene-propylene plastomer) containing at least 60% by weight ethylene.

The present invention provides image pickup optical systems capable of suppressing the degradation of the image quality due to unnecessary light beams while attaining compaction by optimizing the shapes of the emission surfaces of reflection prisms. The image pickup optical system includes an incidence-side prism for reflecting incident light while folding it by about 90 degree and an image-surface side prism. An image pickup device is placed near the emission surface of the image-surface side prism. The incidence-side prism is formed to have a convex emission surface. This can reduce the amount of the unnecessary light beams (stray light) reflected by the aforementioned reflection surface and also causes the unnecessary light beams reflected by the emission surface and the reflection surface to be diffused, thereby significantly reducing the amount of unnecessary light beams directed to the light receiving surface of the image pickup device. This can suppress the occurrence of ghosts and the like due to unnecessary light beams as aforementioned.

An imaging lens which uses a larger number of constituent lenses for higher performance and features a low F-value, low-profile design and a wide field of view. Designed for a solid-state image sensor, the imaging lens includes constituent lenses arranged in order from an object side to an image side: a first positive refractive power lens having a convex object-side surface; a second negative refractive power lens having a concave image-side surface; a third positive refractive power lens having a convex image-side surface; a fourth negative refractive power lens having a concave image-side surface; a fifth positive refractive power lens as a meniscus lens having a convex image-side surface; a sixth lens as a meniscus double-sided aspheric lens having a concave image-side surface near an optical axis; and a seventh negative refractive power lens as a double-sided aspheric lens having a concave image-side surface near the optical axis.

An imaging optical system 100 has an imaging side prism 102 for bending incident light at about 90 degrees for reflection, and an image sensor 105 having a light receiving surface opposing to an exit surface 102b of the imaging side prism 102. At least one of an incident surface 101a of an incident side prism 101 and an incident surface 101a of the imaging side prism 102, or at least one of an exit surface 101b of the incident side prism 101 and the exit surface 102b of the imaging side prism 102 has an optical power. An arrangement relation between the exit surface 102b of the imaging side prism 102 and the image sensor 105 is established to satisfy the conditional formula (1): 0.0≦d / a<0.8   (1) where d represents a distance between the exit surface 102b and the light receiving surface of the image sensor 105, and a represents a height of the light receiving surface of the image sensor 105 on a plane where an optical path of the imaging optical system 100 is folded, e.g., the size of the image sensor 105 in the shorter side direction thereof. This arrangement enables to reduce the thickness of an apparatus housing BD for incorporating the imaging optical system 100.

A lighting apparatus and a display device including the same are disclosed. The present invention relates to a lighting apparatus, which can enhance resistance against gas or humidity and which can present a stable optical property and which can enhance light-emitting efficiency, and a display device including the lighting apparatus.

A fisheye lens with a field angle of at least one hundred sixty degrees is formed of two lens groups, arranged in order from the object side, as follows: a first lens group having negative refractive power and a second lens group having positive refractive power. The first lens group includes, arranged in order from the object side, two lens elements, each having negative refractive power and a meniscus shape with the convex surface on the object side, a lens element having negative refractive power with a concave surface on the image side, and two lens elements of opposite refractive powers. The second lens group includes, arranged in order from the object side, two lens elements of opposite refractive powers, a stop, and two lens elements of opposite refractive powers. The fisheye lens preferably satisfies specified conditions related to spacings of lens surfaces and to distortion characteristics of the fisheye lens.

A single-piece top surface display and integrated front cover for an electronic device. In one embodiment, the cover comprises a thin, flexible, transparent layer coupled with a supporting structure. The flexible layer is supported above a display screen which is coupled with pressure activated sensors located under the display screen. The cover is dust-free, waterproof, and has a flat outer surface that is free of any steps or indentations. Users input data by applying pressure on the cover which causes the display screen to deflect and activate the sensors. The pressure exerted on the sensors is triangulated to register the position of the user input. In another embodiment, the cover is transparent, rigid, and directly contacts the pressure activated sensors which are located in front of the display screen or in the housing behind it. When pressure is applied to the cover, the cover deflects and activates the sensors. In both embodiments, an accelerometer identifies valid input events.

A projection optical system forming an image of an object in a first plane onto a second plane, comprising, an optical element group including at least one refractive member and a plurality of reflective members, and a plurality of lens-barrel units holding the optical element group divided into a plurality of groupings, wherein the plurality of reflective members is all held by one lens-barrel unit of the plurality of lens-barrels units.

An electrochromic rearview mirror element for a motor vehicle comprises a first substantially transparent front substrate having a first and a second surface (and with a substantially transparent conductive electrode on its second surface) and a rear substrate having a third and a fourth surface. The rear substrate is positioned in spaced-apart relationship with the front substrate and with its third surface opposing the second surface of the front substrate. A mirror reflector is disposed on the third surface and a seal is positioned toward a peripheral edge of the substrates forming a cavity therebetween. An electrochromic medium is disposed in the cavity. The mirror reflector preferably comprises a metal layer that reflects at least about 70% of visible light. A display device can be disposed behind the rear substrate. The display device preferably exhibits, when electrically powered, a display luminance of at least about 30 foot lamberts as measured with the display device placed behind, and emitting light through, the electrochromic medium and with the electrochromic medium in its bleached state.