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Ferrite shaped sheets, sintered ferrite substrates and antenna modules

An antenna module and ferrite technology, which is applied in antennas, antenna components, and the magnetism of inorganic materials, can solve problems such as difficulty in thinning boards and inability to adapt to the miniaturization of electronic equipment

Active Publication Date: 2016-04-27
TODA IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to reduce the thickness of such a structure, and it is not suitable for the miniaturization of electronic equipment in recent years.

Method used

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  • Ferrite shaped sheets, sintered ferrite substrates and antenna modules
  • Ferrite shaped sheets, sintered ferrite substrates and antenna modules
  • Ferrite shaped sheets, sintered ferrite substrates and antenna modules

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0125] 1000 parts by weight of Ni-Zn-Cu ferrite powder (composition: Fe 2 o 3 : 48.5Mol%, NiO: 20.5Mol%, ZnO: 20.5Mol%, CuO: 10.5Mol%, firing conditions: 850 ° C for 90 minutes) by 10 parts by weight of titanate coupling agent (Ajinomoto Co., Ltd. 1,000 parts by weight of ferrite powder obtained by surface-treating KR-TTS), 50 parts by weight of thermoplastic elastomer (LUMITAC22-1 manufactured by TOSOH Corporation), density 0.9 g / cm 3 100 parts by weight of polyethylene and 20 parts by weight of stearic acid were kneaded at 130° C. for 40 minutes by a pressure mixer. Use sand blasting to make an iron plate with an average centerline roughness of 450nm and a maximum height of 8μm, at a temperature of 160°C and a pressure of 100kg / cm 2 1. Under the condition of press time of 3 minutes, the obtained ferrite resin composition kneaded product was press-molded to produce a square ferrite molded sheet with a thickness of 77 μm and a side length of 100 mm. This sheet was stacked 1...

Embodiment 2

[0128] 100 parts by weight of the same Ni-Zn-Cu ferrite as in Example 1, 2 parts by weight of butylphthalylbutylglycolate, polyvinyl alcohol resin (manufactured by Sekisui Chemical Industry Co., Ltd. S- 12 parts by weight of LECBBM-1) and 60 parts by weight of a solvent mixed with n-butanol 4:toluene 6 as a solvent were mixed, dissolved and dispersed by a ball mill to obtain a ferrite dispersion coating. After the ferrite dispersion paint is decompressed and defoamed by an oil rotary vacuum pump, on one side, it is sandblasted with a scraper to form a PET film with a center line average roughness of 530nm and a maximum height of 5.6μm (Panac Industry Co. Manufacture Lumimat 50S200 Toress) was coated with a certain thickness, and dried with hot air at 100°C for 30 minutes to obtain a ferrite molded sheet with a thickness of 204 μm. The obtained ferrite molded sheet was cut into a square with a side length of 100 mm, peeled from the PET film, and the obtained sheet was fired und...

Embodiment 3

[0131] Mix the Ni-Zn-Cu ferrite powder (composition: Fe 2 o 3 : 48.5Mol%, NiO: 20.5Mol%, ZnO: 20.5Mol%, CuO: 10.5Mol%, firing conditions: 1000 ℃ 90 minutes) 300 parts by weight, and the same cumulative 50% volume particle diameter as in Example 1 is A ferrite resin composition kneaded product was obtained in the same manner as in Example 1 except that 0.7 μm of Ni—Zn—Cu ferrite was 700 parts by weight. Use an iron plate with an average centerline roughness of 120nm and a maximum roughness of 2μm, at a temperature of 160°C and a pressure of 100kg / cm 21. The obtained kneaded product was press-molded under the condition of a press time of 3 minutes to produce a ferrite molded sheet with a thickness of 200 μm and an external dimension of 100 mm. The sintered ferrite substrate obtained by treating the obtained sheet under the same conditions as in Example 1 was evaluated. As a result, the thickness was 167 μm, and the magnetic permeability at 13.56 MHz was μr′ of 80 and μr″ of 1....

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Abstract

The present invention provides a molded ferrite sheet, sintered ferrite substrate and antenna module. The molded ferrite sheet having opposing surfaces and a thickness in a range of 30 mum to 430 mum, at least one surface of said opposing surfaces having the following surface roughness characteristics in that a center line average roughness is in a range of 170 nm to 800 nm, a maximum height is in a range of 3 mum to 10 mum, and an area occupancy rate of cross-sectional area taken along a horizontal plane at a depth of 50% of the maximum height in a square of side 100 mum is in a range of 10 to 80%.

Description

technical field [0001] The present invention relates to a ferrite shaped sheet for the manufacture of a thin-plate single-layer soft magnetic sintered ferrite substrate, a thin-plate single-layer soft magnetic sintered ferrite substrate, and an antenna module that uses RFID (Radio Frequency Identification: RadioFrequencyIdentification) technology used in non-contact IC tags, etc. Background technique [0002] In order to obtain a sintered ferrite substrate, a molded sheet of ferrite powder or a molded sheet of ferrite powder mixed with a resin is fired. At this time, the molded sheets are fixed (fixed) to each other, and the sintered ferrite substrate is fixed to the base for firing. When the fixed sintered ferrite substrate is peeled off, the sintered ferrite substrate will be damaged. Therefore, in order to prevent the fixation, the following method is generally adopted: on the surface of the ferrite molded sheet before firing and the base for firing Release powder such ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q1/00H01Q1/38H01F1/34
Inventor 木村哲也土手智博山本一美土井孝纪冈野洋司
Owner TODA IND