Patent ID: 8149593

Claim:
A radiation level reducing device, comprising: a metal plate for entirely covering at least one surface of an electromagnetic wave generation source for radiating an electromagnetic wave; a cover region, set within a plane of the metal plate, for covering the entire one surface; and a plurality of slits formed to a band-shape in at least the cover region, and spaced apart from each other, wherein each of the plurality of slits includes, a drawing slit formed extending towards a central part of the cover region from an intense electric field position where an electric field generated in between the electromagnetic wave generation source by the electromagnetic wave is stronger than other positions at an outer periphery of the cover region so as to guide a circular current flowing in a peripheral direction surrounding the central part of the cover region in the central part direction of the cover region by the electromagnetic wave, and a coupling slit formed extending so as to line in parallel to another slit from an end in the central part direction of the cover region in the drawing slit so as to guide the circular current guided by the drawing slit to in between the other slit adjacent on one side in the peripheral direction of the cover region.