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Electromagnetic wave absorbent and method of producing magnetic powder for the absorbent

An absorber and electromagnetic wave technology, applied in the direction of circuits, magnetic materials, electrical components, etc., can solve the problems of expensive equipment and high initial production costs, and achieve strong effectiveness and excellent selectivity

Inactive Publication Date: 2006-11-01
SUMITOMO ELECTRIC IND LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the initial equipment cost for the vapor phase growth method is quite expensive
Therefore, there is a problem that the production cost including the initial cost is high

Method used

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  • Electromagnetic wave absorbent and method of producing magnetic powder for the absorbent
  • Electromagnetic wave absorbent and method of producing magnetic powder for the absorbent
  • Electromagnetic wave absorbent and method of producing magnetic powder for the absorbent

Examples

Experimental program
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Effect test

preparation example Construction

[0075] [Preparation of Magnetic Powder]

[0076] In order to produce the magnetic powder by the electroplating method, a plating pattern is first prepared by the photolithography process through the following steps. The electroplating model is composed of an electrode region corresponding to the plane shape of the magnetic powder and a pattern of an insulating region surrounding the electrode region.

[0077] First, if Figure 1AAs shown, a resist layer 2 is formed on the surface of a metal substrate 1 . The resist material of the resist layer 2 includes positive and negative resist materials, each of which can be used. The part of the positive resist material irradiated with ultraviolet rays is dissolved by the developer, and the remaining part is insoluble. In contrast, the part of the negative resist material irradiated with ultraviolet rays hardens and cannot be dissolved by the developer, while the remaining part is dissolved. In this embodiment, a positive resist mat...

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Abstract

Magnetic powder (4) is prepared using an electroplating model M. The model is composed of an electrode area (10) corresponding to the shape of the magnetic powder (4) and a pattern of an insulating area surrounding the electrode area (10). The electrode is formed by electroplating. A thin film of magnetic material is deposited area selectively (40), and then the thin film is peeled off from the electroplated model (40). Flat magnetic powder (4) having a regular planar shape and diameter or an average grain diameter of 100 nm or less in or between the powders is fully dispersed in an insulating resin as a binder.

Description

technical field [0001] The present invention relates to an electromagnetic wave absorber in which magnetic powder is dispersed in an insulating resin as a binder, and a method of producing the magnetic powder used in the electromagnetic wave absorber. Background technique [0002] In order to stabilize the functions of electronic machinery or communication equipment, electromagnetic wave absorbers are used to absorb external disturbances outside the equipment or electromagnetic waves leaking from the inside to prevent electromagnetic wave noise or interference. [0003] An electromagnetic wave absorber of the related art includes random magnetic powder such as spinel or hexagonal ferrite sinter dispersed in an insulating resin as a binder. [0004] The main applications of electromagnetic wave absorbers include mobile communication equipment and other equipment using quasi-microwave to microwave frequency bands, such as portable phones or PHS (Person...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q17/00H05K9/00G12B17/02H01F1/20C22C38/00C22C38/08C22C38/10H01F1/00H01F1/33
CPCH01Q17/004Y10T428/32Y10T428/2991Y10T428/256Y10T428/2998Y10T428/25
Inventor 细江晃久新田耕司稻泽信二冈山克巳丰田准一
Owner SUMITOMO ELECTRIC IND LTD