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:
Oct. 27, 2009
Filed:
Feb. 28, 2003
Yukihiko Takita, Nagano, JP;
Kenji Hirasawa, Nagano, JP;
Shogo Momose, Nagano, JP;
Yasuhiro Kitazawa, Nagano, JP;
Yukihiko Takita, Nagano, JP;
Kenji Hirasawa, Nagano, JP;
Shogo Momose, Nagano, JP;
Yasuhiro Kitazawa, Nagano, JP;
NIDEC Sankyo Corporation, Nagano, JP;
Abstract
The present invention provides an object sensor configured such that excitation coils (and) and a detection coil () are separately disposed, and the detection is performed in accordance with the balance between the excitation coils (and) in a pair, a residual variation amount after the impedance due to a DC resistance part and the like has been offset and removed is obtained at high sensitivity with excellent linearity while using a small core body (), regardless of the impedance including a DC resistance part. Additionally, the object sensor to be used as an inlet sensor is located in an appropriate position on a more upstream side than the read/write position in an insertion direction of the IC card. A contact terminal portion of the IC card is sensed whereby to detect the validity of the card inserted into the apparatus from a card insertion slot. Thereby, steady detection operations can be implemented for the presence or absence of the IC card, notwithstanding environmental temperature variations. The invention further provides an IC card reader configured such that a plurality of inlet sensors for detecting the type of an inserted card is provided in appropriate positions more upstream than the read/write position in a card insertion direction, wherein when an unusable card or the like is inserted, a control operation of closing shutter means can be performed, thereby enabling illegal action with the card to be prevented.