Abstract: The configuration procedure for an access code and for a security code is provided, comprising: providing references retaining element file that records the base checkerboard-like substrate, checkerboard-like substrates and the color substrates as a graphical image with a hierarchical layered structure arranged on the base substrate, assigning the digital elements to both the x- and the y-axes of the base substrate, assigning the digital elements assigned to the references retaining element on the base substrate perpendicular to the selected two retaining element to the selected two retaining element of the checkerboard-like substrate, configuring code based on the assigned digital elements and the prescribed priority order of the first and areal codes and at the time of the code configuration, recording the location of the retaining element, coaxially rotating the checkerboard-like substrates and color substrates with respect to base checkerboard-like substrate, whereby a new code is configured based on the

Abstract: An illuminating device is disclosed in which light is introduced mainly from a light source provided at a peripheral portion of a light emitting surface thereby illuminating the light emitting surface. The illumination of the light emitting surface is kept uniform irrespective of a shape of the light emitting surface, a type of the light source, a number of light sources and a mounting position of the light sources. The device may be used as a display device.

Abstract: An optical display device such as an emblem mounted on an automotive vehicle is disclosed which is simple in structure and displays a display pattern in a silver metallic color by daylight. The interior of the device is kept invisible in the daytime, whereas the pattern is displayed in any desired color in a uniform manner in the nighttime.

Abstract: A display plate preferably employable for an automotive vehicle for the purpose of displaying a certain name or providing a decorative effect is disclosed. The display plate includes a main body to be secured to a vehicle body of the automotive vehicle. A transparent base plate molded of transparent resin material is received in a cavity of the main body. A plurality of half mirrors corresponding to a content to be displayed are formed on the transparent base plate. A prism plate is disposed behind the transparent base plate and a plurality of light reflecting layers each comprising a number of dots or lines are formed on the prism plate. A color filter is interposed between the transparent base plate and the prism plate to scatter light therefrom. To generate light to be emitted from the front surface of the transparent base plate, a lamp is received in a cavity of the prism plate. A light density per unit area on each light reflective layer increases more and more as a distance from the lamp increases.

Abstract: A system for uniformly illuminating a liquid crystal display board from the rear side includes a main body as an essential component. The main body includes a transparent substrate made of transparent resin, a first coated layer on the front surface of the transparent substrate made of transparent resin having a refractive index different from that of the transparent substrate, a second coated layer on the rear surface of the transparent substrate made of transparent resin having a refractive index different from that of the transparent substrate and a rugged layer on the second coated layer made of transparent resin suitably employable for forming an underlying layer. A plurality of light sources each in the form of a fluorescent lamp are arranged in the transparent substrate in a spaced relationship.