Patent ID: 7305192

Claim:
A cartridge for an image forming apparatus which comprises a charge roller to which a predetermined voltage is applied, a photosensitive drum charged by the charge roller by rotating in contact with the charging roller and a casing for housing the charge roller and the photosensitive drum, further comprising: an electronic element positioned at a predetermined distance from a contact line between the charging roller and the photosensitive drum, for wireless communications; and a shielding member made of a metal interposed between the contact line and the electronic element to form a shielding area to shield electromagnetic waves generated from the contact line between the charging roller and the photosensitive drum, wherein the electronic element is positioned within the shielding area, except for boundary portions of the shielding area to avoid an influence of the electromagnetic waves at boundary surfaces of the shielding area, including any reflection, scattering and diffraction of the electromagnetic waves, wherein the casing forms a plurality of surfaces which intersects with a virtual plain surface extended from the contact line to make an inclination angle, and wherein the electronic element is attached to a surface of the casing located within the shielding area which has a minimum inclination angle.