Abstract:
A top panel, which is disposed to face a module board with an electronic component therebetween, includes a resin layer and a metal layer, and has an insulating characteristic. The metal layer includes a metal layer formed at a front side of the resin layer and a metal layer formed at a rear side of the resin layer. With this structure, in reflow soldering performed in mounting a semiconductor module on a main board, warp which is caused, under temperature change, in the top panel due to difference in coefficient of thermal expansion between the resin layer and the metal layer formed at the front side of the resin layer is cancelled by warp which is caused, under temperature change, in the top panel due to difference in coefficient of thermal expansion between the resin layer and the metal layer formed at the rear side of the resin layer, whereby warp of the top panel is eliminated. This helps prevent the electronic component adhered to the top panel with adhesive from being pressed down to or pulled up from the module board due to warp of the top panel.
Abstract:
PROBLEM TO BE SOLVED: To provide a multilayer printed wiring board in which a multi-layered flexible part having a signal wire is constituted to control an impedance while maintaining flexibility. SOLUTION: In this multilayer printed wiring board, in an outer or inner layer part of a plurality of rigid substrate parts 12a, 12b, a flexible substrate part 13 provided extending over the plurality of rigid substrate parts 12a, 12b so as to connect the plurality of rigid substrate parts 12a, 12b is constituted comprising signal layers l6, l12 for sending signals between the plurality of rigid substrate parts 12a, 12b, ground layers l3, l9, l15 individually formed in both sides of the signal layers l6, l12, and intermediate layers l4, l5, l7, l8, l10, l11, l13, l14 formed between the ground layer l3 in the above both sides and the signal layer l6, between the signal layer l6 and the ground layer l9 in the above both sides, between the ground layer l9 and the signal layer l12, or between the signal layer l12 and the ground layer l15 in the above both sides. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To improve boring precision by eliminating a moving error that is generated when a boring means moves. SOLUTION: A jig plate is provided as formed with a distance mutually between centers of two imaging holes, and a center of a jig hole with respect to the centers of the two imaging holes equally with a relation between two predetermined marks and a predetermined punching position. A moving means and a movable table are adjusted to that the centers of the two imaging holes on the jig plate can be matched with imaging centers of two imaging means, respectively. A substrate for correction placed on the jig plate is bored by a punching means, the position of the opened hole is then moved to the imaging center, an error of the center of the boring position with respect to the center of the jig hole is measured, and the position of a drill with respect to the imaging means is determined to correct that error. Regarding a printed wiring board to be bored with two predetermined marks; the movable table is operated, two predetermined reference marks are matched with the positions of the imaging centers of the two imaging means, respectively, and the printed wiring board is then bored at a predetermined position by the drill. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To realize good soldering, high-density mounting, and reliability by reducing the warpage of a substrate when soldering electronic parts on it. SOLUTION: A warpage reducing member 5 is jointed to the portion on the rear surface of mounting region of a component 2, which is the portion of a substrate 1 where warpage is desired to be reduced, for reducing the warpage of the substrate 1 on which a plurality of components 2 and 3 are mounted. A warpage reducing member 5 comprising an opening 7 has the external dimension similar to that of the component 2, and is jointed to the substrate 1 using a jointing material 6 whose melting point is lower than a solder connection part 4 of the components 2 and 3. Mounting of the warpage reducing member 5 on the substrate 1 is performed in the process identical with a normal soldering mounting process of the component 3. COPYRIGHT: (C)2007,JPO&INPIT