Abstract:
PROBLEM TO BE SOLVED: To provide a motor controller in which disconnection failure is reduced while suppressing cost increase.SOLUTION: When connecting an FPC 50 for supplying power to a motor 10 with a circuit board 30, not only pin-like terminals 31 and wiring pattern terminals 52 connected electrically with a control circuit 20, but also pin-like dummy terminals 32 and a dummy wiring pattern 53 having no electrical connection are provided. Consequently, a load applied to the FPC 50 can be distributed not only to the pin-like terminals 31 and wiring pattern terminals 52, but also to the pin-like dummy terminals 32 and the dummy wiring pattern 53. Since the load applied to the pin-like terminals 31 and wiring pattern terminals 52 is reduced, disconnection between the pin-like terminals 31 and wiring pattern terminals 52 can be reduced in a motor controller 100.
Abstract:
PROBLEM TO BE SOLVED: To relax stress generated in an electronic component, and to easily attach and detach the electronic component.SOLUTION: There is provided a disclosed substrate unit 1. The substrate unit 1 includes a substrate 2, an electronic component 3, and resins 4. The substrate 2 has an electrode. The electronic component 3 is disposed on the substrate 2, and has an electrode electrically connected to the electrode. A plurality of resins 4 are provided at positions apart from the electrode of the electronic component 3 on the substrate 2 corresponding to previously detected positions on which the stress of the electronic component 3 concentrates.
Abstract:
PROBLEM TO BE SOLVED: To eliminate the warping accompanying temperature variation of a top plate 5 made of a dissimilar material, and thereby to reduce the defect of mounting of an electronic component 3 when a semiconductor module is mounted on a main substrate. SOLUTION: The top plate 5, which is arranged opposite a module substrate 1 via the electronic component 3, includes a resin layer 11 and metal layers 12 and 13, and has an insulating property. By the fact that the metal layers 12 and 13 are respectively formed on both sides of the obverse and reverse of the resin layer 11, in a reflow soldering step while mounting the semiconductor module on the main substrate, the warping of the top plate 5 occurring due to the difference in coefficient of thermal expansion between the resin layer 11 and metal layer 12 accompanying temperature variation is canceled by the warping of the top plate 5 occurring due to the difference in coefficient of thermal expansion between the resin layer 11 and metal layer 13, so that the warping of the top plate 5 is eliminated. Consequently, it is possible to avoid a case in which the electronic component 3, which is bonded to the top plate 5 via an adhesive 6, is pressed against the module substrate 1 or lifted due to the warping of the top plate 5. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a damage index prediction system of electronic equipment which enables high-precision damage prediction of mounted components and the like on a circuit board. SOLUTION: The damage prediction system predicts the index about the damage of a joint part of the electronic equipment having a joint part which electrically connects electronic components to the circuit board for mounting and a joint part for detection which is designed so that its lifetime is lower than that of the joint part. The damage prediction system is provided with: database in which the relation about the breakage of the joint part and the joint part for detection is accumulated; a breakage detection part which detects the breakage of the joint part for detection; and a calculation part which calculates the predicted value of the index about the damage of the joint part from information about the breakage of the joint part for detection obtained by the breakage detection part and the relation accumulated in the database. COPYRIGHT: (C)2010,JPO&INPIT