The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 13, 1995
Filed:
Aug. 19, 1993
Kenichi Takahira, Itami, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A signal receiving coil in which an erroneous input of a signal due to an alternating magnetic field that has been accidentally generated is prevented. In this invention, a signal receiving coil includes a first spiral coil having a predetermined winding direction and a second spiral coil spaced from the first spiral coil. The second spiral coil is connected in series to the first spiral coil and has its winding direction opposite from that of the first spiral coil. The second spiral coil generates an induced electromotive force of substantially the same magnitude and opposite direction from the first spiral coil when both spiral coils are subjected to the same alternating magnetic field. When a change in a magnetic field is applied over the entire surface of the signal receiving coil, the induced electromotive forces generated by the two spiral coils cancel each other.