Patent ID: 9144152
Filing Date: 2015-09-22
Classification: H05K

Abstract:
1. A cover lay film comprising: an electromagnetic wave shielding layer formed of a conductive material; a resistor layer having a greater surface resistance than the electromagnetic wave shielding layer; and an insulating resin layer provided between the electromagnetic wave shielding layer and the resistor layer, wherein a plurality of openings penetrating in a thickness direction of the electromagnetic wave shielding layer are provided in the electromagnetic wave shielding layer, and a maximum opening length L in the opening and a wavelength λ of an electromagnetic wave which is a shield target satisfy Expression (1) below: where μ eff is an effective relative permeability and ε eff is an effective relative permittivity, and (μ eff ×ε eff ) −1/2 represents a wavelength compaction ratio k.