Electromagnetic field shielding device

An electrical apparatus including a shielding apparatus for shielding an electromagnetic field leaking from a chassis,

• the electrical apparatus being characterized by the shielding apparatus comprising:
• an electromagnetic field detection means for detecting an electromagnetic field and converting the electromagnetic field into an electric signal;
• and
• a parallel resonance means for causing a parallel resonance which consumes power of the electric signal,
• the electromagnetic field detection means being a coil, and
• the parallel resonance means including an inductance element, a capacitance element, and a resistance element.

An electrical apparatus including a shielding apparatus for shielding an electromagnetic field leaking from an chassis,

• the electrical apparatus being characterized by the shielding apparatus comprising:
• an electromagnetic field detection means for detecting an electromagnetic field and converting the electromagnetic field into an electric signal;
• and
• a parallel resonance means for causing a parallel resonance which consumes power of the electric signal,
• the electromagnetic field detection means being a coil, and
• the parallel resonance means being a plate-shaped electric conductor which includes facing parts forming a capacitor and a loop part forming an inductor.

An electromagnetic field shielding apparatus, comprising:

• an electromagnetic field detection means for detecting an electromagnetic field, wherein the electromagnetic field detection means is a hollow coil for converting the detected field into an electrical signal;
• an electromagnetic field generation means for generating a counteractive electromagnetic field, wherein the electromagnetic generation means is a coil having either a hollow part identical to that of the electromagnetic field detection means or a hollow part having a center axis identical to that of the electromagnetic field detection means;
• and
• a control means for controlling the electromagnetic field generation means so that the electromagnetic field generations means generates a counter electromagnetic field which cancels out the detected electromagnetic field,
• the control means comprising
• a band-pass filter unit for only transmitting a component signal with a specific frequency band out of a plurality of component signals in the electrical signal;
• and
• an electrical supply unit for supplying electricity to the electromagnetic field means according to the transmitted component signal to generate the counteractive electromagnetic field.

An electrical apparatus including a shielding apparatus for shielding an electromagnetic field leaking from an chassis,

• the electrical apparatus being characterized by the shielding apparatus comprising:
• an electromagnetic field detection means for detecting an electromagnetic field;
• an electromagnetic field generation means for generating a counteractive electromagnetic field;
• and
• a control means for controlling the electromagnetic field generation means so that the counteractive electromagnetic field cancels out the detected electromagnetic field,
• the electromagnetic field detection means being a hollow coil for converting the detected electromagnetic field into an electric signal, and
• the electromagnetic field generation means is a coil which has either of a hollow part identical to that of the electromagnetic field detection means and a hollow part having a center axis identical to that of the hollow coil, and the control means comprising:
• a band-pass filter unit for only transmitting a component signal with a specific frequency band out of a plurality of component signals in the electric signal;
• and
• an electrical supply unit for supplying electricity to the electromagnetic field generation means according to the transmitted component signal to generate the counteractive electromagnetic field.