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Recording medium detecting system

A recording medium and detection system technology, which is applied in magnetic recording, data recording, recording information storage, etc., can solve the problems of difficult detection of recording media and no regulation of the amount of magnetic flux reversal carried by the recording medium.

Active Publication Date: 2007-07-04
FUJIFILM BUSINESS INNOVATION CORP
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Problems solved by technology

[0006] However, the method of JP2004-285524A does not specify the amount of magnetic flux reversal generated when the recording medium is carried by the user through the entrance or exit, and, because each recording medium contains an arbitrary amount of magnetic substance, it is generally difficult to detect by the gate device to the recording medium

Method used

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preparation example Construction

[0144] — PREPARATION OF RECORDING MEDIA —

[0145] In pulp having a freeness of 420 ml obtained by beating pulp of 100 parts by mass of broad-width bleached kraft pulp (LBKP) in a Niagara beater (manufactured by Kumagai Riki Kogyo), for each 100 parts by mass The pulp fiber solid matter, add respectively by mass 15 parts of light calcium carbonate (Tamapearl TP-121, manufactured by Okutama Kogyo Co., Ltd.), by mass 0.1 part of aluminum sulfate, by mass 0.8 part of cationic starch ( Trade name: MS4600, manufactured by Nihon Shokuhin Kagaku Kogyo Co., Ltd.) and 0.3 parts by mass of alkenyl succinic anhydride (Fiblan 81, manufactured by National Starch & ChemicalJapan Co. Ltd.); and dilute this mixture with white water , to give a pulp with a solid matter concentration of 0.3% by mass.

[0146] After stirring for 2 hours, in Oriented Sheet Former (manufactured by Kumagai RikiKogyo) at 1.5 kg / cm 2 The pulp is sheet-formed at a jet pressure of 700 m / min (meter / minute) and a drum ...

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Abstract

A recording medium detecting system includes a magnetic field-generating unit that generates an alternating magnetic field in a predetermined particular region, a detecting unit provided close to the particular region, that detects a change in magnetic flux density not smaller than a predetermined magnetic-flux-density difference B 2 , and a recording medium, containing multiple magnetic wires made of a magnetic material and formed in a wire shape having a predetermined length, that causes a large Barkhausen effect when the alternating magnetic field is applied. A magnetic-flux-density difference B 1 detected by the detecting unit at an installation position thereof when the recording medium is placed in the particular region is not smaller than the magnetic-flux-density difference B 2 .

Description

technical field [0001] The present invention relates to a recording medium detection system, and more particularly to a recording medium detection system for detecting a recording medium. Background technique [0002] Recently, more laws and regulations have been promulgated to prevent information leakage, such as laws and regulations related to private information protection, privacy mark, information security, and others. However, since printed paper is very easy to carry and store, it is still difficult to completely prevent leakage of information such as private information and confidential information printed on paper. Therefore, there is an urgent need for a method of preventing confidential information recorded on the recording paper from being leaked while maintaining the ease of use of the recording paper. [0003] Various methods have been proposed to solve this problem. [0004] For example, a method of restricting transfer of a specific recording medium out of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/02G01R33/12D21H21/42
CPCG11B5/00804
Inventor 山口昭治黄田保宪高桥邦广布施真理雄松田司
Owner FUJIFILM BUSINESS INNOVATION CORP
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