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Patent Searching and Data


Title:
ELECTROMAGNETIC WAVE SHIELDING FILM, SHIELDED PRINTED WIRING BOARD, AND ELECTRONIC DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/147299
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide an electromagnetic wave shielding film that has a sufficiently high electromagnetic wave shielding property and is not susceptible to a failure of the inter-layer adhesion of a shielding layer and a conductive adhesive layer during the manufacture of a shielded printed wiring board. An electromagnetic wave shielding film according to the present invention comprises a conductive adhesive layer, a shielding layer that is laminated upon the conductive adhesive layer, and an insulating layer that is laminated upon the shielding layer. The electromagnetic wave shielding film is characterized in that a plurality of openings are formed in the shielding layer, swelling does not occur in the inter-layer delamination evaluation described below, and the electromagnetic wave shielding property of the electromagnetic wave shielding film at 200 MHz as measured using the KEC technique is 85 dB or greater. Layer Delamination Evaluation: The electromagnetic wave shielding film is affixed upon a printed wiring board by hot pressing, the resultant shielded printed wiring board is heated to 265°C and then cooled to room temperature, and after repeating this heating and cooling a total of five times, the electromagnetic wave shielding film is visually observed to determine whether swelling has occurred.

Inventors:
KAMINO KENJI (JP)
YAMAUCHI SIROU (JP)
SHIRAKAMI JUN (JP)
MURAKAWA AKIRA (JP)
Application Number:
PCT/JP2018/004109
Publication Date:
August 16, 2018
Filing Date:
February 07, 2018
Export Citation:
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Assignee:
TATSUTA ELECTRIC WIRE & CABLE CO LTD (JP)
DAINIPPON INK & CHEMICALS (JP)
International Classes:
H05K9/00; B32B3/18; B32B7/02; B32B15/08; B32B15/20
Domestic Patent References:
WO2014192494A12014-12-04
Foreign References:
JP2004273577A2004-09-30
JP2000196285A2000-07-14
Attorney, Agent or Firm:
YASUTOMI & ASSOCIATES (JP)
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