Isotropic bonded NdFeB magnet and magnetic roller consisting of same

An isotropic, NdFeB technology, applied in magnetic objects, magnetic materials, permanent magnets, etc., can solve the problems of difficulty in obtaining a homogeneous magnetic field, affecting imaging quality, and high production costs, achieving difficult demagnetization and high remanence. , the effect of strong magnetic properties

Active Publication Date: 2010-03-17
上海三环磁性材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as an anisotropic bonded R-T-N magnet, it can provide a higher magnetic field strength, but it cannot form an arbitrary magnetic pole configuration by magnetization like an isotropic magnet
Moreover, due to the long size, it is difficult to obtain a homogeneous magnetic field along the axial direction, and the axial uniformity of the magnetic field will greatly affect the quality of imaging
At the same time, it also involves problems such as complex process and high production cost.

Method used

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  • Isotropic bonded NdFeB magnet and magnetic roller consisting of same
  • Isotropic bonded NdFeB magnet and magnetic roller consisting of same
  • Isotropic bonded NdFeB magnet and magnetic roller consisting of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A magnetic roller, structured as figure 1 As shown, there are four magnetic poles, and one magnetic pole N1 is composed of an isotropic bonded NdFeB magnet 12 . 11 is the mandrel of magnetic roller, and all the other magnetic poles are made up of ferrite permanent magnet 13, and 14 is the resin for filling.

[0054] The magnetic pole N1 is composed of an isotropic bonded NdFeB magnet, and the ratio of each component of the magnet is as follows (weight):

[0055] Bonded NdFeB permanent magnet powder 86%,

[0056] Ferrite permanent magnet powder 10%

[0057] Bonding resin 4%

[0058] The particle size of the bonded NdFeB permanent magnet powder is about 70-100 μm;

[0059] The particle size of ferrite magnetic powder is 0.9~1.2μm;

[0060] The binding resin is selected from polyamide resin nylon 6 and nylon 12, and the weight ratio of nylon 6 and nylon 12 is 1:1;

[0061] Said isotropic bonded NdFeB magnets are prepared as follows:

[0062] Firstly, the above raw m...

Embodiment 2

[0068] A magnetic roller, structured as figure 2 , with 6 magnetic poles, two of which, N1 and S1, are composed of isotropic bonded NdFeB magnets. 11 is the mandrel of magnetic roller, and residual magnetic pole is made up of ferrite permanent magnet 13.

[0069] The magnetic poles N1 and S1 are composed of isotropic bonded NdFeB magnets, and the ratio of each component of the magnets is as follows: (weight)

[0070] Bonded NdFeB permanent magnet powder 78%,

[0071] Ferrite permanent magnet powder 15%

[0072] Bonding resin 7%

[0073] The particle size of the bonded NdFeB permanent magnet powder is about 70-100 μm;

[0074] The particle size of ferrite magnetic powder is 0.9~1.2μm;

[0075] The binding resin is selected from nylon 6, nylon 12 and nylon 6-12, and the weight ratio of nylon 6, nylon 12 and nylon 6-12 is 1:1:1;

[0076] Said isotropic bonded NdFeB magnets are prepared as follows:

[0077] Firstly, the above raw materials are accurately weighed according ...

Embodiment 3

[0083] A magnetic roller, structured as image 3 , There are 8 magnetic poles, two of which, N1 and S1, are composed of isotropic bonded NdFeB magnets. 11 is the mandrel of magnetic roller, and residual magnetic pole is made up of ferrite permanent magnet 13.

[0084] The magnetic poles N1 and S1 are composed of isotropic bonded NdFeB magnets, and the ratio of each component of the magnets is as follows: (weight)

[0085] Bonded NdFeB permanent magnet powder 70%,

[0086] Ferrite permanent magnet powder 20%

[0087] Bonding resin 10%

[0088] The particle size of the bonded NdFeB permanent magnet powder is about 70-100 μm;

[0089] The particle size of ferrite magnetic powder is 0.9~1.5μm;

[0090] The binding resin is selected from nylon 6, nylon 66 and nylon 12, and the weight ratio of nylon 6, nylon 66 and nylon 12 is 2:1:1;

[0091] Said isotropic bonded NdFeB magnets are prepared as follows:

[0092] Firstly, the above raw materials are accurately weighed according...

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Abstract

The invention relates to a magnetic roller used in a laser printer and a copier. An isotropic bonded NdFeB magnet used by the magnetic roller contains rare earth permanent magnetic powder and adhesive resin, wherein the rare earth permanent magnetic powder is a mixture of NdFeB magnetic powder and ferrit magnetic powder, and the formed magnet has the length of between 210 and 910mm. When the isotropic bonded NdFeB magnet is used to replace one or more ferrit permanent magnet poles in the magnetic roller, because the bonded NdFeB magnet has stronger magnetic performance than ferrit magnets, a strong magnetic filed can be formed on an outer surface taking the bonded NdFeB magnet as a pole so as to provide stronger magnetic filed adsorptive power, contribute to the size distribution of multiple kinds of color matching powder, and reduce the grey back of copying and printing to contribute to clear imaging.

Description

technical field [0001] The invention relates to the technical field of magnetic rollers used in printers and copiers. Background technique [0002] The magnetic roller is the key component of development in laser printers and copiers, and its performance is directly related to the quality of imaging. At present, a typical magnetic roller includes a mandrel, a cylindrical permanent magnet fixed on the outside of the said mandrel, the surface of the permanent magnet has a plurality of magnetic poles extending in the axial direction, the magnetic roller is covered with a sleeve, and the magnetic roller can be relatively sleeved. Drum turns. Its working principle is: through the relative rotation of the magnetic roller and the sleeve, the magnetic roller absorbs the magnetic developer onto the surface of the sleeve, and then transports it to the developing area and develops it by electrostatic charge. Usually such a magnetic roller has an outer diameter of 10-60 mm, a length o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/053H01F1/09H01F1/08H01F7/02H01F41/02B22F3/12
Inventor 魏强陈玮李纲饶晓雷周兆暖郭晓燕陈巍强项友生赵佑民
Owner 上海三环磁性材料有限公司
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