A method for controlling focus of an optical system. A first area of the support plate coming into contact with at least one of the plurality of conductive patterns in step is different in surface roughness from a second area of the support plate coming into contact with the resin layer in step. Examples include chromatographic and other separation media, drug delivery vehicles, and electric and mechanical actuators. At this time, since the outer section of the diaphragm is engaged with the scope joint, the diaphragm and TV camera unit can be turned relative to an objective optical system and relay optical system with the optical axis of the relay optical system as an axis of turning.