Abstract: The present invention relates to an epoxy resin composition for electronic parts encapsulation, including the following components (A) to (E), (A) an epoxy resin having an ICI viscosity of from 0.008 to 0.1 Pa·s and an epoxy equivalent of from 100 to 200 g/eq; (B) a phenol resin having an ICI viscosity of from 0.008 to 0.1 Pa·s and a hydroxyl-group equivalent of from 100 to 200 g/eq; (C) a curing accelerator; (D) an inorganic filler; and (E) a silicone compound, in which the component (D) is contained in an amount of from 82 to 88 wt % of the whole of the epoxy resin composition, the component (E) is contained in an amount of from 5 to 15 wt % of the whole of organic components in the epoxy resin composition, and the epoxy resin composition has a gelation time of 15 to 25 seconds.

Abstract: The present invention relates to an epoxy resin composition for electronic component encapsulation, including the following components (A) to (D): (A) an epoxy resin; (B) a curing agent: an allylated phenol resin containing a structural unit (1) shown below and a structural unit (2) shown below, in which a molar ratio [structural unit (1)/[structural unit (1)+structural unit (2)]×100] of the structural unit (1) to a total amount of the structural unit (1) and the structural unit (2) is from 40 to 100%; (C) a curing accelerator; and (D) an inorganic filler, in which the allylated phenol resin as the component (B) has a glass transition temperature of ?5° C. to 70° C.

Abstract: A production method of a suspension board with circuit includes the steps of forming, on a metal supporting board, an insulating layer formed with a first opening, forming a metal thin film on the insulating layer and on the metal supporting board exposed from the first opening, forming, on a surface of the metal thin film, a conductive layer having terminal portions forming, on the terminal portions, a metal plating layer by electrolytic plating using the metal supporting board as a lead, forming a second opening in a portion of the metal supporting board opposing the first opening, and partially etching the metal supporting board to form the suspension board with circuit and a support frame. In the step of forming the insulating layer, the first opening is formed in the insulating layer in which the supporting frame is formed.

Abstract: A wired circuit board includes a metal supporting board, an insulating layer formed on the metal supporting board, and a conductive pattern formed on the insulating layer. The conductive pattern includes an underlying layer formed on the insulating layer and a conductive layer formed on the underlying layer. The underlying layer is formed with a corroded portion corroded from a side end portion of the conductive layer toward an inner portion thereof. A semiconductive layer is formed on a surface of the insulating layer and on a surface of the conductive pattern. The semiconductive layer is formed so as to come in contact with the metal supporting board and have a cut formed in the corroded portion to interrupt conduction between the semiconductive layer formed on the surface of the insulating layer and the semiconductive layer formed on a surface of the conductive layer.

Abstract: A production method of a suspension board with circuit includes the steps of forming, on a metal supporting board, an insulating layer formed with a first opening, forming a metal thin film on the insulating layer and on the metal supporting board exposed from the first opening, forming, on a surface of the metal thin film, a conductive layer having terminal portions forming, on the terminal portions, a metal plating layer by electrolytic plating using the metal supporting board as a lead, forming a second opening in a portion of the metal supporting board opposing the first opening, and partially etching the metal supporting board to form the suspension board with circuit and a support frame. In the step of forming the insulating layer, the first opening is formed in the insulating layer in which the supporting frame is formed.

Abstract: A suspension board with circuit includes an insulating layer formed with a first opening, a conductive layer formed on the insulating layer so as to fill the first opening, a metal thin film formed so as to cover a surface of the conductive layer exposed from the first opening, and be interposed between the conductive layer and the insulating layer, and a metal supporting layer formed with a second opening surrounding the first opening so as to underlie the insulating layer. The metal supporting layer includes a covering portion provided in the second opening so as to cover the first opening.

Abstract: A wired circuit board includes a metal supporting board, an insulating layer formed on the metal supporting board, and a conductive pattern formed on the insulating layer. The conductive pattern includes an underlying layer formed on the insulating layer and a conductive layer formed on the underlying layer. The underlying layer is formed with a corroded portion corroded from a side end portion of the conductive layer toward an inner portion thereof. A semiconductive layer is formed on a surface of the insulating layer and on a surface of the conductive pattern. The semiconductive layer is formed so as to come in contact with the metal supporting board and have a cut formed in the corroded portion to interrupt conduction between the semiconductive layer formed on the surface of the insulating layer and the semiconductive layer formed on a surface of the conductive layer.