To lessen the possibility of radiation of the electromagnetic waves of low frequency by a method wherein nothes are provided at a prescribed pitch in the ridges part in height direction of a frame main body and a door, and an insulating material is fitted to the notches.
A cover 20 is shielded by interposing a shielding gasket between the four cornet edge faces of the housing frame plate of a frame main body 10 and the four corner edge faces of the door frame plate. On this type of electronic device, notches 40 are provided at a prescribed pitch P (25cm for example) at which low frequency (130MHz for example) does not resonate, on the height (height H is 230cm, for example) direction ridgeline part (the four corners of the frame main body and the two corners of the front sidew of the door 20). An insulator 41 is provided on the protruding part on the two orthogonally intersecting surfaces, the protruding part is fitted to the notches 40, and the insulator 42 is fitted to the notches 40. As a result, the resonance of the low frequency of 60MHz or lower is eliminated.
HORIKOSHI OSAMU
SAITO MASAHIKO
SAKURADA KOJI
