A metal contact in a semiconductor device is formed by forming an insulating layer having a contact hole therein on a silicon substrate. In as embodiment of the invention, the belt deck is cantilevered from the frame. The present invention deploys enzymesphysicalmicrobial parameters to hasten the hydrolytic reaction in the first stage. A rear surface 22b of the translucent member 22 is formed from a light reflection control surface formed while taking, as a reference surface, a paraboloid of rotation whose focal point is a position having symmetry with an illumination center of the light source with reference to the front surface of the translucent member. The ink may be applied to a substrate to form an electrode, or bonded with other electrode layers to form a membrane electrode assembly.