MAGNETIC HEAD FOR PAPER SHEET MAGNETIC DETECTION

• Main Authors: MUTO SHINICHI, UDA JITSUO
• Format: Patent
• Language: English; Japanese
• Published: 24.09.2021
• Subjects: CHECKING-DEVICES; HANDLING OF COINS OR OF PAPER CURRENCY OR SIMILAR VALUABLEPAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING,DISPENSING, CHANGING OR DEPOSITING; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

To provide a magnetic head for paper sheet magnetic detection that can effectively prevent a reduction in detection accuracy due to factors such as spacing loss.SOLUTION: A magnetic head for paper sheet magnetic detection includes: a first magnetic gap 3 facing a transport path 2 of a paper sheet P; a first magnetic circuit 4 with the first magnetic gap 3 intervening; a second magnetic gap 5 located inside the first magnetic circuit 4; a second magnetic circuit 6 with the second magnetic gap 5 intervening; a circuit overlap 7 where a part of the first magnetic circuit 4 and a part of the second magnetic circuit 6 overlap; an exciting permanent magnet 8 that excites the first magnetic circuit 4 and the second magnetic circuit 6 at the circuit overlap 7; a detection coil 9 that only detects the magnetism flowing in the second magnetic circuit 6 inside the first magnetic circuit 4; and a repulsive permanent magnet 15 having repulsion polarity that is arranged inside the first magnetic gap 3 and along the inner circumference of the first magnetic circuit 4, and expelling leakage flux that is about to leak inside the first magnetic gap 3 to the outside of the first magnetic gap 3.SELECTED DRAWING: Figure 1 【課題】スペーシングロスなどによる検出精度の低下を効果的に抑制できる紙葉類磁気検出用磁気ヘッドを提供する。【解決手段】 紙葉類Ｐの搬送路２に対向する第１磁気ギャップ３と、第１磁気ギャップ３が介在する第１磁気回路４と、第１磁気回路４の内側に配置される第２磁気ギャップ５と、第２磁気ギャップ５が介在する第２磁気回路６と、第１磁気回路４の一部と第２磁気回路６の一部が重複する回路重複部７と、回路重複部７で第１磁気回路４及び第２磁気回路６を励磁する励磁用永久磁石８と、第１磁気回路４の内側で第２磁気回路６に流れる磁気のみを検出する検出コイル９と、第１磁気ギャップ３の内側で、かつ第１磁気回路４の内周に沿うように配置され、第１磁気ギャップ３の内側に漏れようとする漏れ磁束を第１磁気ギャップ３の外側に追い出す反発極性を有した反発用永久磁石１５と、を備える。【選択図】図１