Abstract:
PROBLEM TO BE SOLVED: To provide a method for manufacturing the housing body of a portable telephone easily and inexpensively. SOLUTION: The method for manufacturing the housing body of the portable telephone consists of a stage for forming a covering layer to be applied and laminated to the housing body, a stage for arranging the covering layer between a movable mold and a fixed mold, a stage for injecting a molten resin in the cavity formed between the covering layer and the fixed mold, a stage for cooling the resin and a stage for forming the housing body comprising the resin covered with the covering layer.
Abstract:
PROBLEM TO BE SOLVED: To provide a conductor ball connecting structure for electronic parts, which can connect conductor balls to pads with high strengths and can improve the peeling resistances of the conductor balls. SOLUTION: A wiring layer 3 is formed on the surface of a polyimide tape 2 on which a molded resin section 1 is formed and pads 6 for connecting conductor balls are formed on the opposite surface of the tape 2. Then the wiring layer 3 is connected to the pads 6 through via holes 4. Consequently, the connection reliability between the pads 6 and conductor balls 5 can be improved remarkably.
Abstract:
PROBLEM TO BE SOLVED: To prevent the occurrence of pure contact between an electric component and a mounting substrate due to external impact. SOLUTION: To An electric component 3 is so allocated as to overlap each of corner electrodes 1b and 4b positioned at nearly square corners, of electrodes 1 and 4 provided in array on the opposite side of an electronic component 2 across a multilayer printed wiring board 5. Thus, the multilayer printed wiring board 5 becomes hard to be deformed at the parts of the corner electrodes 1b and 4b. Consequently, the deformation of the multilayer printed wiring board 5 is suppressed, and poor contact between the electronic component 2 and the multilayer printed wiring board 5 is prevented.
Abstract:
PROBLEM TO BE SOLVED: To provide a package structure, capable of preventing defective contact between a BGA package and a multilayered printed wiring board, even if it is due to an external impact. SOLUTION: When a solder bump 7 is jointed with the outer peripheral part out of multiple electrodes 2 matrix-arrayed on a multilayered printed wiring board 3, the whole junction part of the solder bump 7 is terminated at the outer peripheral part of the electrode 2a. In other words, when a leading- out wiring which exposes the surface of the substrate 3 is eliminated from the electrode 2a, a crack-starting point can is eliminated, thereby enabling the solder bump 7 to be hardy released from the outermost peripheral electrode 2a, even if it is caused by an external impact. Through these procedures, the defective contact between a BGA package 1 and the multilayered printed wiring board 3 can be avoided.
Abstract:
PROBLEM TO BE SOLVED: To avoid a defective contact between an electronic component and a package substrate by a method, wherein the cracking in a packaging substrate caused due to external impacts is avoided for avoiding the disconnection in a leading out wiring arranged in the packaging substrate. SOLUTION: In order to terminate the whole terminal end of the junction of solder bumps 7 with an outermost peripheral electrode 2a at the inner peripheral part of the electrode 2a positioned on the outer periphery from among multiple electrodes 2 arrayed on a multilayered printed wiring board 3, the outer peripheral part of the electrode 2a is covered with a solder resist 10. Through these procedures, since the end part of the outermost peripheral electrode 2a which is most likely to cause crackings does not coincide with the stress concentration point in an external impact time, the cracking in the multilayered printed wiring board 3 is avoided, thereby enabling the defective contact between a BGA package 1 and the multilayered printed wiring board 3 to be prevented.
Abstract:
PROBLEM TO BE SOLVED: To improve the fatigue failure life when a multilayer substrate, on which a highly integrated wiring can be provided using recessed type via holes, is used. SOLUTION: A square-shaped ball grid array package 4 is arranged opposing to the surface of a multilayer printed wiring substrate 1. A plane pad is arranged on the four corners of the region where the square-shaped ball grid array package is provided in the multilayer printed wiring substrate 1, and a via hole pad is arranged on the other region. Said plane pad is soldered to the solder balls 3 for the plane pad protruding from the side of the ball grid array package 4, and the via hole pad is soldered to the via hole solder balls 2 protruding from the side of the ball grid array package 4.
Abstract:
PROBLEM TO BE SOLVED: To improve the reliability of the connection of a semiconductor part with a board by preventing the generations of the voids of their solder connection portions. SOLUTION: In a multilayer printed circuit board 12 for mounting a ball grid array package type semiconductor part (BGA part) 11 thereon, surface pads 18 for connecting therewith the bumps of the part 11 are provided and recess-form circular via holes 20 are formed to provide therein via hole pads 19 which are connected with an inner layer conductor pattern 15 of the board 12. After printing cream solders on the pads 18, 19, the BGA part 11 is mounted on the board 12 and they are thereafter passed through a reflow furnace to obtain solder connection portions 13 by integrating the solder bumps and cream solders with each other. Diameter dimensions (a) of the openings of the via holes 20 are set to 150-300 μm which are nearly as large as the dimensions required in order that the cream solders flow in their printing directions, accompanied by their printing operations successively to be filled into the via holes 20. Depth dimensions (b) of the via holes 20 are set to 20-70 μm.
Abstract:
PROBLEM TO BE SOLVED: To provide a multilayer substrate improved in both yield and electrical connection reliability between an electric element and a conductor pattern, and also to provide its manufacturing method. SOLUTION: The multilayer substrate 100 is formed by disposing an electric element 30 in a thermoplastic resin 10 and by electrically connecting an electrode 31 of the electric element 30 to conductor patterns 20, 20a disposed in the thermoplastic resin 10 via a connection material 14 put inside a via hole 13. The thermoplastic resin 10 is constituted by laminating a base film 11 whereon the electric element 30 is mounted in advance and resin films 12a to 12c. Different constituent materials are applied to the base film 11 and the resin films 12a to 12c so that the glass transition point to the melting point (the temperature of lowering of elasticity modulus) of the base film 11 is higher than the glass transition point to the melting point (the temperature of lowering of elasticity modulus) of the resin films 12a to 12c. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a semiconductor device which can have its build made small-sized while reducing wiring resistance and whose processing time can be shortened. SOLUTION: The semiconductor device 100 is equipped with an IC chip 10 which has an electrode 11 on one surface, an insulating substrate 21; a wiring pattern 22 formed on the insulating substrate 21; and a circuit board 20 which includes the wiring pattern 22 as its bottom and is formed of a 1st via hole 24 filled with a 1st connection material 23. The semiconductor also has the electrode 11 and wiring pattern 22 electrically connected to each other through the 1st connection material 23 while the IC chip 10 is mounted on the circuit board 20. The wiring pattern 22 is provided thicker than the electrode 11. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a passive device built-in substrate, as well as its fabrication method, that has passive devices built-in such as a capacitor, resistance, etc., and whose structure and manufacturing steps are simplified. SOLUTION: The passive device built-in substrate has multiple resin films 23 including thermoplastic resin, conductor patterns 22 laminated alternately with these multiple resin films 23, and electrically conductible compositions 51 that electrically connect the conductor patterns 22 embedded in via holes 24 formed in each resin film 23 and set on both sides of each resin film 23. A pair of conductor patterns 22a and 22b are arranged on both sides of the resin film 23 at opposite positions with only the resin film 23 between, thus building a passive device functioning as a capacitor 30 in a multilayer substrate. Accordingly, there is no need to use any special materials and others for building the capacitor 30, and its structure is very streamlined. COPYRIGHT: (C)2004,JPO