A acrylic acidalkyl acrylate ester copolymer containing:95. Each of these devices includes a substrate defining a fluid chamber having a fluid outlet nozzle and a fluid supply channel respectively defined in opposite walls of the chamber. The conductor core may comprise at least one conductor. An elastic reaction force which acts on the contactor from the elastic sheet when the elastic sheet is compressed becomes weaker at the central part side as compared with the outer peripheral side of the contactor. The eye position is adjustable for achieving a positioning wherein the spots are substantially vertically aligned.