A linear motion guide unit is provided which is downsized in size, maintenance-free for lubrication, and makes it possible to assemble easily and quickly the slider with accuracy. In one example embodiment, this is accomplished by modifying a source code, including multiple instructions, using Lexical Functional Grammar Analysis operation on each instruction as a function of specific Digital Signal Processor architecture. The first micro structures are disposed on the light-exit surface, and the second micro structures are disposed on the light-receiving surface. Another claim recites a security document including a security pattern provided thereon.