An offset rotary joint unit equipped with a rotation correction mechanism, in which a bending motion can be executed in a two-dimensional plane only by virtue of a rotary mechanism and which can support a high-load weight and is applicable for two-arm mechanisms such as nursing assistant robots. The platform independent system includes a consuming application executing on a first computer that handles the search request provided by a user. The optical transmittances of the \u201csmart glass\u201d elements are electronically regulated to provide the operator with a representation of the scene image through the optical viewfinder during the inactive observation period, and to alternately allow the external light to reach the image-sensing device during a photographic exposure. These novel substrates are particularly useful for improved enzyme substrate microarrays.