Magnetic wire and recording media

A recording medium and magnetic wire technology, applied in magnetic recording, electrical recording, data recording, etc., can solve the problems of weak magnetic signal, detection by non-contact reading system, etc.

Active Publication Date: 2011-12-21
FUJIFILM BUSINESS INNOVATION CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the magnetic signal emanating from paper using small diameter strong magnetic filaments is so weak that the presence of the paper cannot be detected with a non-contact type reading system

Method used

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  • Magnetic wire and recording media
  • Magnetic wire and recording media
  • Magnetic wire and recording media

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0156] -Preparation of magnet wire-

[0157] As a magnetic metal material used as a raw material, a metal rod (Co—Fe—Si—Cr—B alloy) having a diameter of 4 mm to 5 mm is used. Composition ratios of Co, Fe, Si, Cr, and B elements contained in the metal rod were 82% by weight, 5% by weight, 6% by weight, 4% by weight, and 3% by weight, respectively.

[0158] As a glass tube filled with magnetic metal material, used by PYREX Tube made of glass (outer diameter: 10 mm, glass thickness: 1.0 mm). PYREX Glass is a trademark of Coming Glass Works in the United States, and its typical composition is: SiO 2 81% by weight, B 2 o 3 13% by weight, Na 2 O is 4 wt%, Al 2 o 3 2% by weight.

[0159] Insert the tip of the metal rod into the glass tube. Subsequently, the metal rod in the glass tube was heated with a high-frequency heating device at a frequency of 440 kHz and an input power of 1 to 2 kW to melt the metal rod in the glass tube.

[0160] In this state, the lower end of t...

Embodiment 2

[0174] Except that the coiling speed when preparing the magnetic wire is changed to 60 to 80 m / min, the wire is prepared in the same manner as in Example 1, and the material is cut into the same length as in Example 1 to obtain a magnetic wire . Subsequently, a recording medium was prepared in the same manner as in Example 1 except that the magnetic wire obtained here was used.

[0175] The magnetic wire obtained above had a coercive force of 10.3 A / m, an average diameter of the core portion (amorphous magnetic metal wire) of 35 μm, and an average thickness of the glass coating layer of 3.6 μm. When the entire outer peripheral surface of the magnetic wire was observed with a scanning electron microscope, no exposed amorphous magnetic metal wire was observed, and it was confirmed that the glass coating layer completely covered the amorphous magnetic metal wire.

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Abstract

The present invention provides a magnetic wire and a recording medium. The magnetic wire includes a magnetic metal wire, and the surface of the magnetic metal wire is covered with an insulating material layer. The magnetic wire has a coercive force of 30 A / m or less and has a Barkhausen effect.

Description

technical field [0001] The present invention relates to a magnetic wire contained in a recording medium which can be used to form an image by an electrophotographic system, etc., and a recording medium using the magnetic wire, the magnetic wire enabling detection by a non-contact type magnetic signal detector to the existence of the recording medium. Background technique [0002] So far, for the purpose of preventing forgery, secrecy of highly classified information, etc., various papers and parts containing magnetic materials have been researched. [0003] As a magnetic material used in paper and parts for this purpose, for example, magnetic fibers produced by fixing magnetic powder on the surface of a fibrous substance are known (see Japanese Patent Application Laid-Open No. 11-107161 and Japanese Patent Laid-Open No. 2004 - Bulletin No. 131888). When the magnetic sensor is brought close to the paper containing the magnetic fibers, the magnetization pattern can be detect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G7/00D21H27/00D21H21/48
CPCG11B5/642Y10T428/32Y10T428/31993
Inventor 布施真理雄山口昭治松田司栗原英三黄田保宪高桥邦广
Owner FUJIFILM BUSINESS INNOVATION CORP
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