Abstract: A printed wiring board includes a laminate including resin insulating layers and conductor layers such that the resin insulating layers and the conductor layers are laminated alternately and that the laminate has a through hole opening to a first surface of the laminate and a component accommodating cavity that accommodates an electronic component and having an opening part formed on a second surface of the laminate on the opposite side with respect to the first surface. The through hole is formed through the laminate such that the through hole is extending to the component accommodating cavity, and the laminate has a resin coating formed on an inner wall surface of the through hole.

Abstract: A printed wiring board includes a laminate including resin insulating layers and conductor layers such that the resin insulating layers and the conductor layers are laminated alternately and that the laminate has a through hole opening to a first surface of the laminate and a component accommodating cavity that accommodates an electronic component and having an opening part formed on a second surface of the laminate on the opposite side with respect to the first surface. The through hole is formed through the laminate such that the through hole is extending to the component accommodating cavity, and the laminate has a resin coating formed on an inner wall surface of the through hole.

Abstract: A wiring board includes a substrate, a surface protection film laminated on the substrate and having an opening portion, and a conductor block embedded in the substrate and having a pad portion exposed by the opening portion of the surface protection film. The conductor block has an annular groove formed such that the annular groove is surrounding the pad portion of the conductor block, and the surface protection film is formed such that a portion of the surface protection film is extending into the annular groove.

Abstract: A wiring board includes a substrate, a surface protection film laminated on the substrate and having an opening portion, and a conductor block embedded in the substrate and having a pad portion exposed by the opening portion of the surface protection film. The conductor block has an annular groove formed such that the annular groove is surrounding the pad portion of the conductor block, and the surface protection film is formed such that a portion of the surface protection film is extending into the annular groove.

Abstract: A wiring board includes an insulating substrate, a first conductor layer laminated on a first side of the insulating substrate, a second conductor layer laminated on a second side of the insulating substrate, first plating posts fitted in through holes in the insulating substrate respectively such that the first plating posts are projecting from the first conductor layer, and plating connecting parts connecting the second conductor layer and the first plating posts and having electronic component connecting portions such that the electronic component connecting portions form an electronic component mounting part positioned to mount an electronic component and are positioned on the through holes, respectively.

Abstract: A wiring board includes an insulating substrate, a first conductor layer laminated on a first side of the insulating substrate, a second conductor layer laminated on a second side of the insulating substrate, first plating posts fitted in through holes in the insulating substrate respectively such that the first plating posts are projecting from the first conductor layer, and plating connecting parts connecting the second conductor layer and the first plating posts and having electronic component connecting portions such that the electronic component connecting portions form an electronic component mounting part positioned to mount an electronic component and are positioned on the through holes, respectively.

Abstract: A printed wiring board includes a multilayer core substrate, a first buildup layer formed on the multilayer core substrate and including an interlayer insulation layer and a conductive layer, a second buildup layer formed on the multilayer core substrate and including an interlayer resin insulation layer and a conductive layer, and an end-surface through hole conductor formed on side surfaces of the first and second buildup layers and core substrate such that the through hole conductor connects the conductive layers of the first and second buildup layers. The core substrate includes a first conductive layer, a middle conductive layer, a second conductive layer, a first insulation layer between the first and middle conductive layers and a second insulation layer between the second and middle conductive layers, and the middle conductive layer is connected to the through-hole conductor and has thickness greater than thicknesses of the first and second conductive layers.

Abstract: A printed wiring board includes a core substrate, and a buildup layer formed on the core substrate and including an interlayer resin insulation layer and a conductive layer. The core substrate includes a metal core, a first insulation layer on first surface of the metal core, a first conductive layer on the first insulation layer, a second insulation layer on second surface of the metal core, and a second conductive layer on the second insulation layer, the metal core has a penetrating hole penetrating from the first surface to the second surface and a resin portion filling the penetrating hole, the resin portion includes resin material from the first insulation layer, the core substrate has a through-hole conductor formed in the resin portion through the metal core, the interlayer resin insulation layer has a core material, and the first insulation layer does not have a core material.

Abstract: A printed wiring board includes a multilayer core substrate, a first buildup layer formed on the multilayer core substrate and including an interlayer insulation layer and a conductive layer, a second buildup layer formed on the multilayer core substrate and including an interlayer resin insulation layer and a conductive layer, and an end-surface through hole conductor formed on side surfaces of the first and second buildup layers and core substrate such that the through hole conductor connects the conductive layers of the first and second buildup layers. The core substrate includes a first conductive layer, a middle conductive layer, a second conductive layer, a first insulation layer between the first and middle conductive layers and a second insulation layer between the second and middle conductive layers, and the middle conductive layer is connected to the through-hole conductor and has thickness greater than thicknesses of the first and second conductive layers.

Abstract: The present invention provides a variable valve operating mechanism which includes two valve operating members for opening and closing two valves individually, a drive cam provided on a single camshaft, two swing arms for transmitting a power of the drive cam to the valve operating members individually by swinging about a different axis to the camshaft, and a variable device for modifying a displacement of the swing arm per rotation of the drive cam in accordance with an operating condition of an internal combustion engine. The variable device includes a single control shaft, an actuator for driving the control shaft, and a cam device that operates in conjunction with the control shaft to dissimilate the displacement of the two swing arms.

Abstract: The present invention provides a variable valve mechanism which includes a rotating cam provided on a camshaft, a swing arm that contacts with the rotating cam to swing, a drive arm that drives a valve in conjunction with the swing arm, a variable arm that turns the drive arm around a swing axis of the swing arm, an actuator that drives the variable arm, and cam device that is provided between the swing arm and the drive arm. The variable arm is provided so as to be able to rotate relatively around the same axis as the swing arm, and the cam device changes the initial position of the drive arm with respect to the swing arm accompanying the turning of the drive arm.

Abstract: The present invention provides a variable valve mechanism which includes a rotating cam provided on a camshaft, a swing arm that contacts with the rotating cam to swing, a drive arm that drives a valve in conjunction with the swing arm, a variable arm that turns the drive arm around a swing axis of the swing arm, an actuator that drives the variable arm, and cam device that is provided between the swing arm and the drive arm. The variable arm is provided so as to be able to rotate relatively around the same axis as the swing arm, and the cam device changes the initial position of the drive arm with respect to the swing arm accompanying the turning of the drive arm.

Abstract: The present invention provides a variable valve operating mechanism which includes two valve operating members for opening and closing two valves individually, a drive cam provided on a single camshaft, two swing arms for transmitting a power of the drive cam to the valve operating members individually by swinging about a different axis to the camshaft, and a variable device for modifying a displacement of the swing arm per rotation of the drive cam in accordance with an operating condition of an internal combustion engine. The variable device includes a single control shaft, an actuator for driving the control shaft, and a cam device that operates in conjunction with the control shaft to dissimilate the displacement of the two swing arms.

Abstract: This four stroke V-configuration engine has two cylinder banks which have equal numbers of cylinders, angled with respect to one another at a bank angle .alpha. different from 90.degree.. For each bank of cylinders, the angular positions of the crank shaft crank pins therefor are evenly spaced apart around the central axis of the crank shaft, and between the banks of cylinders the angular positions of a pair of corresponding cylinders are separated by a crank angle of 90.degree.-.alpha.. A first set of balance weights is provided so as to rotate about an axis parallel to the rotational axis of the crank shaft in the same direction and at the same speed as the crank shaft, and a second set of balance weights is provided so as to rotate about an axis parallel to the rotational axis of the crank shaft in the opposite direction and at the same speed as the crank shaft.

Abstract: An elastic supporting and sealing member, for mutually supporting a first body and a second body, and for sealing the gap between the first body and the second body, includes a first portion and a second portion of wire net and a piece of thermal foaming material, between the first and the second wire net portion, which expands and foams when it is heated up. A method of making such a member includes the steps of flattening a tubular shaped piece of wire net, and of introducing a strip shaped piece of such thermal foaming material between the two sides of the flattened tube of wire net, so that the longitudinal directions of the strip shaped piece of thermal foaming material and of the flattened wire net tube substantially coincide.

Abstract: A valve drive device for an internal combustion engine characterized in a movably pivoted rocker arm, at either a cam-contacting part or a valve stem-contacting part thereof, having installed therein a built-in oil pressure tappet for automatically absorbing a gap created at such contacting part. Between the oil pressure tappet and the cam or the valve stem, in contact with the oil pressure tappet, a movable plate is provided, having a curved surface where the movable plate and/or the oil pressure tappet contact each other, thereby lubricating the contacting part to prevent its abrasion.