Abstract:
A printed wiring board includes a capacitor including a dielectric body having a first surface and a second surface, a first electrode provided on the first surface of the dielectric body, and a second electrode provided on the second surface of the dielectric body. The first electrode has an area facing and being smaller than the first surface of the dielectric body, and the second electrode has an area facing and being larger than the second surface of the dielectric body.
Abstract:
A method for manufacturing a board with a built-in electronic element, includes providing a support substrate including a support base and a metal foil, forming a protective film made of a metal material on the metal foil of the support substrate, forming a conductive pattern made of a metal material on the protective film by an additive method, placing an electronic element on the support substrate with the conductive pattern such that a surface of the electronic element where a circuit is formed faces the conductive pattern, covering the electronic element with an insulative resin, etching away the metal foil using a first etching solution such that the protective film is not dissolved by the first etching solution or that the protective film has an etching speed which is slower than an etching speed of the metal foil, and electrically connecting terminals of the electronic element and a part of the conductive pattern.
Abstract:
When a package substrate with a built-in capacitor includes a first thin-film small electrode 41aa and a second thin-film small electrode 42aa that are electrically short-circuited to each other via a pinhole P in a high-dielectric layer 43, a power supply post 61a and a via hole 61b are not formed in the first thin-film small electrode 41aa, and a ground post 62a and a via hole 62b are not formed in the second thin-film small electrode 42aa, either. As a result, the short-circuited small electrodes 41aa and 42aa are electrically connected to neither a power supply line nor a ground line, and become a potential independent from a power supply potential and a ground potential. Therefore, in the thin-film capacitor 40, only the portion where the short-circuited small electrodes 41aa and 42aa sandwich the high dielectric layer 43 loses the capacitor function, and portions where other thin-film small electrodes 41a and 42a sandwich the high dielectric layer 43 maintain the capacitor function.
Abstract:
A multilayer printed wiring board is equipped with a core board 20, a build-up layer 30 formed on the core board 20 so as to have a conductor pattern 32 on the upper surface thereof, a low-elasticity layer 40 formed on the build-up layer 30, lands 52 that are provided on the upper surface of the low-elasticity layer 40 and connected to an IC chip 70 via solder bumps 66, and conductor posts 50 that penetrate through the low-elasticity layer 40 and electrically connect the lands 52 to the conductor pattern 32. The low-elasticity layer 40 is formed of resin composition containing epoxy resin, phenol resin, cross-linked rubber particles and a hardening catalyst.
Abstract:
A multilayer printed wiring board (10) includes: a build-up layer (30) that is formed on a core substrate (20) and has a conductor pattern (32) disposed on an upper surface; a low elastic modulus layer (40) that is 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 IC chip (70); and conductor posts (50) that pass through the low elastic modulus layer (40) and electrically connect lands (52) with conductor patterns (32). The conductor posts (50) have the aspect ratio Rasp (height/minimum diameter) of not less than 4 and the minimum diameter exceeding 30 μm, and the aspect ratio Rasp of external conductor posts 50a, which are positioned at external portions of the low elastic modulus layer (40), is greater than or equal to the aspect ratio Rasp of internal conductor posts (50b), which are positioned at internal portions of the low elastic modulus layer (40).
Abstract:
This invention provides a multilayer printed wiring board which achieves fine pitches. A heat resistant substrate is incorporated in a multilayer printed wiring board and interlayer resin insulation layer and conductive layer are placed alternately on the heat resistant substrate. A built-up wiring board in which respective conductive layers are connected by via hole is formed. A via hole is formed on the surface of a mirror-processed Si substrate by using a heat resistant substrate composed of Si substrate so that finer wiring than a resin substrate having unevenness in its surface can be formed, whereby achieving fine pitches. Further, by forming the wiring on a mirror processed surface, dispersion of wiring decreases thereby decreasing dispersion of impedance.
Abstract:
The capacitance of a capacitor is adjusted by forming openings in one of a pair of electrodes of the capacitor, the openings having different sizes d1, d2, d3, wherein d1>d2>d3> . . . and being arranged in numbers n1, n2, n3, . . . , respectively; and sequentially filling a necessary number of the openings with an electroconductive material in descending order of the size so as to adjust the capacitance gradually with an increasing degree of precision. The resulting capacitor is mounted to a printed wiring board.
Abstract:
The present invention is to provide a printed wiring board in which malconnection or disconnection caused by a difference between coefficients of thermal expansion of a semiconductor chip and a printed wiring board can be decreased even when a highly-integrated semiconductor apparatus is mounted thereon and an electronic device using the same. An electronic device (4) according to the present invention includes a printed wiring board (1) with a component mounting pin (18) and a surface-mounting type semiconductor apparatus (2) with an electrode pad (3), wherein the component mounting pin (18) has elasticity and is urged against the electrode pad (3) to maintain electric connection.
Abstract:
A printed circuit board including a conductor portion, an insulating layer formed over the conductor portion, a thin-film capacitor formed over the insulating layer and including a first electrode, a second electrode and a high-dielectric layer interposed between the first electrode and the second electrode, and a via-hole conductor structure formed through the second electrode and insulating layer and electrically connecting the second electrode and the conductor portion. The via-hole conductor structure has a first portion in the second electrode and a second portion in the insulating layer. The first portion of the via-hole conductor structure has a truncated-cone shape tapering toward the conductor portion.
Abstract:
In a multi-layer printed wiring board 100 comprising single side circuit boards A, B and for accommodating an IC chip 70, BGAs 56 are disposed on its front and rear faces, so that with an IC module 120 mounted through the BGA 56 on the front face, this board can be connected to a printed wiring board through the BGA 56 on the rear face. Thus, freedom in the configuration of the IC module mounted increases so that various kinds of the IC modules can be loaded.