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Patent Searching and Data


Title:
SHEET COIL MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2017/081828
Kind Code:
A1
Abstract:
Provided is a sheet coil manufacturing method that makes it possible, during etching of an electrically conductive metal layer, to prevent a residue of a non-uniform un-eroded portion, and to make the cross sectional area of a coil portion uniform. A back surface of an electrically conductive metal foil 2 is masked with a resist 4 having the same shape as a back surface of a coil portion 2a to be formed, and recess portions 5, 6 are formed by performing etching from the back surface of the metal foil 2 to a front surface thereof or to a depth smaller than the thickness of the metal foil 2. Thereafter, the front surface of the metal foil 2 is masked with a resist 9 having the same shape as the resist 4, and etching is performed from the front surface of the metal foil 2 to the recess portions 5, 6 so as to reliably remove un-eroded portions 5a, 6a that have not been removed by the initial etching. The back surface of the metal foil 2 is affixed to the base material 7 as needed.

Inventors:
TADA JUNICHI (JP)
Application Number:
JP2015/082048
Publication Date:
May 18, 2017
Filing Date:
November 13, 2015
Export Citation:
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Assignee:
IGARASHI ELECTRIC WORKS LTD (?2120023, JP)
International Classes:
H01F41/04
Foreign References:
JP2005234607A2005-09-02
JPS61106045A1986-05-24
JP2004218033A2004-08-05
Attorney, Agent or Firm:
TAKEZAWA Soichi et al. (?1000012, JP)
Soichi Takezawa (?1000012, JP)
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