Title:
COIL PART AND ANTENNA
Document Type and Number:
WIPO Patent Application WO/2018/230426
Kind Code:
A1
Abstract:
Provided is a coil part comprising a coil, a ferrite core passing through a hollow core portion of the coil, and a resin covering the coil and the ferrite core, wherein a Ni-based ferrite core which has an initial permeability μi of 450 or more at a frequency of 100 kHz and a temperature of 20°C and an average crystal grain size of 5-9 μm, and in which the rate of change TLa and TLb of inductance against a temperature change, and the rate of change PLa and PLb of inductance against a stress change are each -0.6% to +0.6%, and the sum of TLa and PLa and the sum of TLb and PLb are both more than -1.0% and less than +1.0%, is used as the ferrite core. An antenna using the coil part is also provided.
Inventors:
YAMAMOTO HIROKI (JP)
TADA TOMOYUKI (JP)
TANAKA SATORU (JP)
TADA TOMOYUKI (JP)
TANAKA SATORU (JP)
Application Number:
PCT/JP2018/021820
Publication Date:
December 20, 2018
Filing Date:
June 07, 2018
Export Citation:
Assignee:
HITACHI METALS LTD (JP)
International Classes:
H01Q7/08; H01F1/34; H01F3/08; H01F27/255; H01P1/30
Foreign References:
| JP4914448B2 | 2012-04-11 | |||
| JP2005097085A | 2005-04-14 | |||
| JP5841312B2 | 2016-01-13 | |||
| JPS5717110A | 1982-01-28 | |||
| JPH06140229A | 1994-05-20 |
Other References:
See also references of EP 3641057A4
Attorney, Agent or Firm:
TAKAISHI Kitsuma (JP)
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