The subject innovation andor methods relate to a compact durable communication device that can include a plurality of improvements to provide durability and thinness. A first and a second N-type epitaxial silicon layers are stacked on a P-type single crystalline silicon substrate, and P-type well regions are formed in the second epitaxial silicon layer. The cone shaped ground element has a first vertex region and an aperture formed through the first vertex region. The first wiring harness operatively connects to at least one component within a tailgate and further has a first electrical contact that is positioned within the first portion of the hinge mechanism. This near field light becomes propagation light and enters a recording medium of a disk, and recording into the recording medium is performed by this light. Also, a nucleic acid amplification device having a structure in which a plurality of minute reaction cells each comprising a set of a bead-retaining space capable of retaining a single analysis bead and a reagent reaction space retaining no bead but having a volume that is large enough to cause a reagent reaction therein are positioned so as to form a planar face is provided.