Title:
CARD READER
Document Type and Number:
WIPO Patent Application WO/2017/169601
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a card reader which, when the power is off, cannot illicitly acquire magnetic information of a magnetic card via a pre-head. This card reader 1 is provided with: a pre-head 50 which detects change in the magnetic field by means of magnetoresistive elements 21, 22; a voltage applying circuit 23 which applies a voltage to the pre-head 50; and a reference voltage circuit 30 which superimposes a reference voltage V0 onto the voltage signal S1 from the pre-head 50; the card reader is also provided with a signal processing circuit 24 which outputs a detection signal S4 on the basis of the difference between the voltage signal S1 and the reference voltage V0. Further, the card reader 1 is provided with a coupling capacitor 26 which is inserted between the pre-head 50 and the signal processing circuit 24, and a switching circuit 27 which connects the coupling capacitor 26 and the signal processing circuit 24 at the same time that voltage is applied to the pre-head 50 from the voltage applying circuit 23.
Inventors:
HIGASHI KATSUHISA (JP)
SHIMIZU YOHEI (JP)
SHIMIZU YOHEI (JP)
Application Number:
PCT/JP2017/009309
Publication Date:
October 05, 2017
Filing Date:
March 08, 2017
Export Citation:
Assignee:
NIDEC SANKYO CORP (JP)
International Classes:
G06K13/067; G06K7/10
Domestic Patent References:
| WO2016035559A1 | 2016-03-10 |
Foreign References:
| JPH08335253A | 1996-12-17 | |||
| JP2014016849A | 2014-01-30 |
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