Magnetic core, magnetic field shielding part and electronic photographic equipment with them

A shielding component, electrophotography technology, applied in the direction of electric heating device, electric recording process using charge pattern, equipment for electric recording process using charge pattern, etc., to achieve the effect of eliminating heat loss and eddy current

Inactive Publication Date: 2003-03-05
FUJIFILM BUSINESS INNOVATION CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of a fixing device using a heat roller including a heat source such as a halogen lamp, there is a limit to shortening the warm-up time because of the following reasons: it takes a considerable time to heat the halogen lamp itself, and the heat propagates to the heating roller. It takes time for the surface of the roller (because the heat is generated from the inside of the heated roller), and it takes time to heat the whole (because a heated roller core with a considerable heat capacity must be selected)

Method used

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  • Magnetic core, magnetic field shielding part and electronic photographic equipment with them
  • Magnetic core, magnetic field shielding part and electronic photographic equipment with them
  • Magnetic core, magnetic field shielding part and electronic photographic equipment with them

Examples

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no. 1 example

[0070] First, a first embodiment of the magnetic core related to the present invention will be discussed. The magnetic core can be easily used as an inductive element at low cost and has adjustable magnetic permeability.

[0071] Such as figure 1As shown, the magnetic core 10 of the present invention includes a cylindrical container 12 and a collection of magnetic particles 14 . The container 12 is filled with aggregates of magnetic particles 14 maintained in a particle state. The container 12 is made of a non-magnetic material such as plastic, and a conductive material such as a coil is wound around the container 12, so that the container 12 can be used as an inductance element. The magnetic core 10 made of the assembly of the container 12 and the magnetic particles 14 is sealed with a cover 18, so that the magnetic particles 14 can be put into the container 12 and taken out from the container 12, and can be sealed so that the magnetic particles 14 will not Outflow to the ...

no. 2 example

[0119] A second embodiment of the magnetic field shielding member capable of suppressing electromagnetic field leakage easily and at low cost related to the present invention will be described below.

[0120] In the first embodiment, an example has been described in which an aggregate of magnetic particles is installed in a part of a magnetic core forming a part of an inductive element such as a coil or a transformer to improve the coil or transformer. Electromagnetic properties. However, aggregates of magnetic particles can also be used to act as a suppressor of electromagnetic field leakage. For example, aggregates of magnetic particles can be used as a magnetic field shielding member for shielding electromagnetic field leakage around magnetic field generating members such as coils or transformers with magnetic cores, air-core coils or transformers with only windings, and permanent magnets.

[0121] Magnetic field generating components such as inductive elements may be invo...

no. 3 example

[0129]A third embodiment in which an inductance element using the magnetic core of the present invention is applied to an electrophotographic apparatus as an electric device will be described below. In this third embodiment, specifically, a fixing device in which the magnetic core of the present invention is applied to an electrophotographic device will be described. The constitution of this embodiment is almost the same as that of the above-mentioned embodiment, and therefore, the same components as the above-mentioned components are denoted by the same reference numerals, and will not be described in detail below.

[0130] In general, an electrophotographic apparatus includes: an image forming unit for forming an unfixed toner image on the surface of a recording medium using electrophotography; and a fixing device unit for fixing the toner image thereon to form an unfixed toner image on the surface of the recording medium.

[0131] Heretofore, a fixing device as a fixing de...

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Abstract

The present invention provides: (1) a magnetic coil in which magnetic particles 14 form an aggregate and the aggregate of the magnetic particles is disposed in a vessel 12 while the magnetic particles are keeping a particle state, (2) a magnetic field shield member for shielding magnetic field generated from a magnetic field generation member, the magnetic field shield member in which magnetic particles form an aggregate and the aggregate of the magnetic particles is disposed in a vessel 12 while the magnetic particles are keeping a particle state, and an electrophotographic apparatus using them.

Description

[0001] This disclosure is related to subject matter contained in Japanese Patent Application No. 2001-230149 filed on July 30, 2001 and Japanese Patent Application No. 2001-366402 filed on November 30, 2001, which are hereby incorporated by reference in their entirety . field of invention [0002] The present invention relates to a magnetic core, a magnetic field shielding part and an electrophotographic device using them, in particular to a magnetic core suitable for an inductance element (such as a coil or a transformer) mounted with a magnetic substance to generate electromagnetic properties, a magnetic field shielding part, and an electrophotographic apparatus using them. Background technique [0003] A coil or transformer of an inductive element is an important part of electronic and electrical equipment as a component with inductance. In recent years, electronic equipment such as mobile phones, PHS, and portable computers have tended to be complicated, miniaturized, a...

Claims

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Application Information

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IPC IPC(8): G03G15/16G03G15/20G03G15/24H01F1/20H01F1/36H01F27/255H01F27/36H05B6/14
CPCG03G15/2053H01F27/365H01F27/255H05B6/145H01F27/36H01F27/366
Inventor 上原康博冈贯示长谷波茂彦
Owner FUJIFILM BUSINESS INNOVATION CORP
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