Title:
【発明の名称】ウィーガンドトークン用の読み取りヘッド
Document Type and Number:
Japanese Patent JP2002502076
Kind Code:
A
Abstract:
A read head for a Wiegand wire has two C-shaped ferro-magnetic yokes in lateral alignment with one another, two magnets sandwiched between respective first and second legs-of the yokes, and a pickup coil wound on one of the legs of the read head. One magnet has a first polarity adjacent to the first leg of the first yoke, the other magnet has the first polarity adjacent to the second leg of the second yoke, and the reluctances of the two yokes are equal. When used in combination with a processor that processes the output pulses, a Wiegand token having one or more Wiegand wires therein may be detected by counting the number of output pulses of the read head and ascertaining the duration of time between occurrences of those pulses. Wiegand tokens having different values may have different numbers of Wiegand wires therein and/or different spacings between the Wiegand wires within the Wiegand token and, thus, the read head in combination with a processor can identify Wiegand tokens of different values.
Inventors:
Carl Gandaliras
Application Number:
JP2000529685A
Publication Date:
January 22, 2002
Filing Date:
January 26, 1999
Export Citation:
Assignee:
H-ID Corporation
International Classes:
G06K7/08; G06K19/07; G06K19/077; G07D5/08; G07F1/06; G07F7/02; G11B5/33; (IPC1-7): G07D5/08; G06K7/08
Attorney, Agent or Firm:
Shuji Watanabe (1 person outside)