Abstract:
A reflector is provided which has viewing angle properties that when the reflected light of the light having entered the reflector is observed from the direction close to the normal direction to the reflector, it can be seen brighter than seen from the other viewing angles. A reflector includes a plurality of concave parts formed on the surface of a base material, wherein the inner surface of the concave part is formed of a surface that a peripheral curved surface being a part of aspheric surface is continued to a plane at a position surrounded by the peripheral curved surface; each of the plurality of the concave parts has a specified longitudinal section passing through a deepest point of the concave part; the form of the inner surface of the specified longitudinal section is formed of a first curve from one peripheral part of the concave part to the deepest point, a second curve from the deepest point to a first straight line continuously to the first curve, the first straight line to a third curve continuously to the second curve, and the third curve to an other peripheral part continuously to the first straight line; a curvature radius of the second curve is greater than a curvature radius of the first curve; and curvature radii of the second curve and the third curve are equal.
Abstract:
A main optical path disposed between light input and output ends and an auxiliary optical path disposed so as to correspond to the main optical path are optically coupled to each other with first, second, and third optical couplers. The respective optical path lengths of main and auxiliary optical paths differ from each other between the first and second optical couplers and between the second and third optical couplers. Between the first and second optical couplers and between the second and third optical couplers, at least one of the main and auxiliary optical paths is provided with temperature adjusting means for adjusting the temperature of the corresponding optical path.
Abstract:
The present invention provides for polarization independence in electrooptic waveguides. Specifically, in accordance with one embodiment of the present invention, an electrooptic waveguide for an optical signal is provided. The waveguide comprises a plurality of control electrodes, an optical waveguide core defining a primary axis of propagation, and an electrooptic cladding at least partially surrounding the core. The control electrodes are positioned to generate a contoured electric field across the cladding. The cladding is poled along a poling contour. The contoured electric field and/or the poling contour are asymmetric relative to a plane intersecting the waveguide core and extending along the primary axis of propagation. The electrooptic cladding defines at least two cladding regions on opposite sides of the waveguide core. The contoured electric field comprises (i) a vertical electric field component within a first one of said pair cladding regions that is larger than a vertical component in a second one of the cladding regions and (ii) a horizontal electric field component within the first cladding region that is smaller than a horizontal component in the second cladding region.
Abstract:
The invention provides an optical modulator module by which a dip appearing in a frequency characteristic of a microwave from a DC component to a high-frequency component can be reduced while maintaining the mechanical strength and facilitating handling of a substrate and besides securing the long-term reliability without processing the substrate itself. The optical modulator module includes a substrate, an optical modulator including an optical waveguide, a signal electrode, and a ground electrode, and a housing in and to which the optical modulator is accommodated and secured. The shape of a longitudinal section of the other portion of the optical modulator module than the substrate is asymmetrical with respect to a perpendicular line with which the portion of the signal electrode which extends in parallel to the optical waveguide is bisected in the longitudinal direction. The optical modulator module is applied typically to an optical communication system.
Abstract:
The present invention relates to a structure of a liquid crystal (LC) cell using an antiferroelectric liquid crystal. The LC cell includes: an electrode substrate with color filters; an opposite electrode substrate; a first alignment film provided on the electrode substrate with color filters; a second alignment film provided on the opposite electrode substrate; an antiferroelectric liquid crystal provided between the first and second alignment films; and the electrode substrate with color filters and the opposite electrode substrate being superimposed so as to face each other through the first alignment film, the antiferroelectric liquid crystal, and the second alignment film. In the present invention, an alignment process of the first alignment film is performed based on a rubbing density larger than the rubbing density of the second alignment film so that an angle of layer rotation of the antiferroelectric liquid crystal is defined within a predetermined allowable angle range.
Abstract:
A liquid crystal display device 100 of the present invention includes a liquid crystal layer 13, a specular reflection layer 14r, the polarization layer 17 disposed on the viewer's side, a retardation layer 18 interposed between the liquid crystal layer and the polarization layer, and a light scattering layer 20A disposed on the viewer's side of the polarization layer 17. The light scattering layer 20A has a scattering surface. The scattering surface includes a macro uneven structure 22a which has light scatterability and a micro uneven structure 22b which is superimposedly formed over the macro uneven structure and which is smaller than visible light wavelengths.
Abstract:
A liquid crystal display device that can be fabricated more simply as compared with a conventional device and suitably used ina liquid crystal display television satisfying both high pixel transmittance and wide viewing angle display characteristics is provided. The liquid crystal display device includes a pair of substrates including at least one transparent substrate, a liquid crystal layer interposed between the pair of substrates, and a liquid crystal alignment layer interposed between the liquid crystal layer and at least any one of the pair of substrates. On the liquid crystal alignment layer, a plurality of closed regions having a liquid crystal alignment direction different from the surrounding liquid crystal alignment direction are arranged. In the liquid crystal display element, each of the closed regions has such a shape that the head and tail are distinguishable along the surrounding liquid crystal alignment direction.