An extending wall mounted cabinet includes an upper cabinet mounted into a wall and a lower cabinet moveable between an upper retracted position and a lower extended position. The mesh is adhered by an adhesive to the architectural molding. The dielectric cover includes a dielectric member formed integral therewith. In addition, when a flatten scanner is developed, necessity for fine adjustment to correct the length of a scanned image is eliminated, and, therefore, time required to develop a scanner is shortened.