Abstract:
A build-up multilayer printed circuit board in which an interlaminar insulating layer (2) and a conductor layer (5, 5') are alternately laminated on at least one surface of a wiring substrate (1) having a conductor circuit and a through-hole (9), and the conductor layers (5, 5') are electrically connected to each other through a viahole (7) formed in the interlaminar insulating layer (2), characterized in that a roughened layer (11) is formed on the surface of the conductor in an inner wall of the through-hole (9), and a resin filler comprising a resin and inorganic particles is filled in the through-hole (9) formed in the substrate (1).
Abstract:
A heat dissipating wiring board comprises: a metal wiring plate with a circuit pattern formed therein: a filler containing resin layer embedded with the metal wiring plate such that a top surface of the metal wiring plate is exposed; and a heat dissipating plate arranged on an under surface of the filler containing resin layer, wherein the circuit pattern is formed of a through groove provided in the metal wiring plate, and this through groove is made up of: a fine groove that opens at the top surface of the metal wiring plate; and an expanded groove that expands from a lower end of the fine groove toward the under surface of the metal wiring plate. The heat dissipating wiring board is capable of improving reliability against electric insulation due to a dust or the like in a space of the through groove.
Abstract:
A method for fabricating a multilayer circuit board, including: preparing a film 1 with interlayer adhesive in which a first protective film 102 and a first interlayer adhesive 104 are stacked; preparing a first circuit board 2 having a first base 202 and a conductive post 204 protruding from the first base 202; stacking the surface of the first interlayer adhesive and the surface including the conductive post together; peeling off the first protective film 102; preparing a second circuit board 3 including a conductive pad 302 receiving the conductive post 204; and stacking and bonding the first circuit board 2 and the second circuit board 3 through the first interlayer adhesive 104 so that the conductive post 204 and the conductive pad 302 face each other, wherein in the peeling off, the first interlayer adhesive 104 at the top portion 206 of the conductive post is selectively removed while peeling off the first protective film 102.
Abstract:
A multilayer printed wiring board 10 includes: a core substrate 20; a build-up layer 30 formed on the core substrate 20 and having a conductor pattern 32 on an upper surface; a low elastic modulus layer 40 formed on the build-up layer 30; lands 52 that are disposed on an upper surface of the low elastic modulus layer 40 and connected via solder bumps 66 to a semiconductor chip 70; and conductor posts 50 that are passing through the low elastic modulus layer 40 and electrically connecting lands 52 with conductor patterns 32. The conductor posts 50 are formed to have the diameters of an upper portion and a lower portion of 80µm, the diameter of an intermediate portion of 35µm, the height of 200µm, and the aspect ratio Rasp (height/minimum diameter) of 5.7 and the maximum diameter/minimum diameter of 2.3.
Abstract:
A release layer paste used for producing a multilayer electronic device, used in combination with an electrode layer paste including terpineol, dehydroterpineol, terpineol acetate, or dehydroterpineol acetate and including a ceramic powder, organic vehicle, plasticizer, and dispersion agent, the organic vehicle containing a binder having polyvinyl acetal as its main ingredient, a ratio (P/B) of the ceramic powder and the binder and plasticizer being controlled to 1.33 to 5.56 (however, excluding 5.56).
Abstract:
The invention relates to an electronic assembly, in particular, for low power consumption electric switching devices such as low power contactors, time relays or the like. In order to provide protection against input current pulses, an ohmic resistor (6) is provided in the form of a resistive layer that is applied by pressing.
Abstract:
An electroless plating method of the present invention includes the steps of preparing a substrate (15) having an insulating body (10) and a conductive pattern (12) formed thereon, adhering a catalytic metal (14) serving as a catalyst of an electroless plating onto the insulating body (10) and the conductive pattern (12), forming selectively a protection film (16) or an oxidizing agent used to oxidize the catalytic metal on the catalytic metal (14) in a space portion (S) between the conductive pattern (12), and forming selectively a metal layer (18) on the conductive pattern (12) by the electroless plating.