The described embodiments may provide a method of fabricating a chemical detection device. The first scanning unit includes all the mechanisms necessary to permit sheet fed scanning of documents using a stationary image forming subsystem. An upper electrode formed together with a control gate electrode in one process is disposed over the lower electrode with an insulating film, which is formed together with an intergate insulating film in the memory cell area in one process, interposed therebetween. The lens also allows a portion of the light it receives from the light source to be transmitted therethrough, providing downlight from the light fixture.