Abstract: A portable engine generator, has a box-shaped case defining an internal space for holding an engine and an electric generator to be driven by the engine. The case is provided with carrying handles. The portable engine generator is provided with a cooling air passage through which fresh air as cooling air flows into the internal space while the engine is in operation. An inward depressed part is formed in a front cover of the case on the side of the internal space with respect to the carrying handles The carrying handles and the inward depressed part define the cooling air passage. The cooling air passage serves as a hand space into which human hand is inserted to grip the carrying handles.

Abstract: A wiring board comprising: a plate core having a first main surface and a second main surface; conductor layers including a conductor line; dielectric layers laminated alternately with said conductor layers on at least one of said first and second main surfaces; via conductors as defined herein; a signal through-hole as defined herein; a signal through-hole conductor as defined herein; a first path end pad as defined herein; a second path end pad as defined herein; a shield through-hole as defined herein; and a shield through-hole conductor as defined herein; wherein: a signal transmission path is formed as defined herein; at least one of said conductor layers is disposed on each of said first and second main surface sides; said surface conductor on said first main surface side and said conductor line form a strip line, a microstrip line, or a coplanar waveguide with constant characteristic impedance Z0; an inner surface of said shield through-hole is covered with said shield through-hole conductor; and an in

Abstract: An intermediate substrate includes a substrate core formed by a main core body portion constructed of a sheet of polymer material and having a subsidiary core accommodation portion formed therein. A ceramic subsidiary core portion, which is constructed of a ceramic sheet, is accommodated in the subsidiary core accommodation portion and is of a thickness matching that of the main core body portion. A thin film capacitor is formed on a first main surface side of a plate-like base of the core portion and includes first and second thin film electrodes separated from each other by a thin film dielectric layer so as to provide direct current isolation between the electrodes. First and second direct current isolated terminals of a first terminal array are electrically connected to the first and second thin film electrodes.

Abstract: An intermediate substrate is provided which reduces the effect of the difference in the coefficients of linear expansion between the terminals of the substrate and those of a semiconductor integrated circuit device, and which thus lowers the likelihood of disconnection due to thermal stress. The intermediate substrate, which is a planar member made of a polymeric material, includes a substrate core including a main core body having formed therein a sub-core compartment, and a ceramic sub-core section accommodated in the compartment. A first terminal array on the first principal surface side includes two types of terminals, functioning either as power source terminals or ground terminals, and a signal terminal. The array occupies an area entirely included within an orthogonally projected region of the sub-core section projected onto a reference plane parallel to the planar surface of the substrate core.

Abstract: An intermediate substrate is provided which reduces the effect of the difference in the coefficients of linear expansion between the terminals of the substrate and those of a semiconductor integrated circuit device, and which thus lowers the likelihood of disconnection due to thermal stress. The intermediate substrate, which is a planar member made of a polymeric material, includes a substrate core including a main core body having formed therein a sub-core compartment, and a ceramic sub-core section accommodated in the compartment. A first terminal array on the first principal surface side includes two types of terminals, functioning either as power source terminals or ground terminals, and a signal terminal. The array occupies an area entirely included within an orthogonally projected region of the sub-core section projected onto a reference plane parallel to the planar surface of the substrate core.

Abstract: An intermediate substrate includes a substrate core formed by a main core body portion constructed of a sheet of polymer material and having a subsidiary core accommodation portion formed therein. A ceramic subsidiary core portion, which is constructed of a ceramic sheet, is accommodated in the subsidiary core accommodation portion and is of a thickness matching that of the main core body portion. A thin film capacitor is formed on a first main surface side of a plate-like base of the core portion and includes first and second thin film electrodes separated from each other by a thin film dielectric layer so as to provide direct current isolation between the electrodes. First and second direct current isolated terminals of a first terminal array are electrically connected to the first and second thin film electrodes.

Abstract: A self-propelled operating machine has a power source, a hydraulic CVT for varying power outputted from the power source, and a transmission mechanism connected to the hydraulic CVT for transmitting power outputted from the hydraulic CVT. A stand is mounted between the transmission mechanism and the power source so as to enclose the hydraulic CVT. The stand has an oil passage through which hydraulic oil of the hydraulic CVT flows. A cooling fan cools the oil passage of the stand to thereby cool the hydraulic oil of the hydraulic CVT flowing through the oil passage. The cooling fan is disposed between the power source and the hydraulic CVT so as to be enclosed by the stand.

Abstract: An intermediate board comprising: an intermediate board body having first and second faces wherein a semiconductor device is to be mounted on at least one of said first and second faces, said semiconductor device having a coefficient of thermal expansion that is equal to or larger than 2.0 ppm/° C. and smaller than 5.0 ppm/° C., and having surface mount terminals, said intermediate board body having a plurality of through holes through which said first and second faces communicate with each other, said intermediate board body containing an inorganic insulating material; and a plurality of conductor columns filling said through holes and containing a conductive metal, said conductor columns being to be connected with said surface mount terminals.

Abstract: A walk-behind working machine includes a motive power source, right and left transmission shafts, and a clutch for transmitting motive power from the source to the shafts. The transmission shafts are disposed in alignment with their respective ends butting against each other. The clutch includes a driving cylindrical member rotationally mounted around the transmission shafts. The transmission shafts have first grooves formed on their outer peripheral surfaces while the cylindrical member has second grooves formed on an inner peripheral surface thereof. The clutch further includes balls disposed between a space defined by the first and second grooves. The first groove is of substantially V-shaped configuration. The first groove has a leading end positioned between the ends of the transmission shafts.

Abstract: A walk-behind working machine includes a motive power source, right and left transmission shafts, and a clutch for transmitting motive power from the source to the shafts. The transmission shafts are disposed in alignment with their respective ends butting against each other. The clutch includes a driving cylindrical member rotationally mounted around the transmission shafts. The transmission shafts have first grooves formed on their outer peripheral surfaces while the cylindrical member has second grooves formed on an inner peripheral surface thereof. The clutch further includes balls disposed between a space defined by the first and second grooves. The first groove is of substantially V-shaped configuration. The first groove has a leading end positioned between the ends of the transmission shafts.

Abstract: A self-propelled operating machine which transmits power from a power source via a hydraulic CVT to a transmission mechanism and transmits the power from the transmission mechanism to left and right axles is provided. On the transmission mechanism, the hydraulic CVT and a stand substantially enclosing the side peripheral surface of the CVT are disposed. On the stand, the power source is disposed. The power source, hydraulic CVT and transmission mechanism, which constitute a power train, are thus put together to reduce installation space. The stand has a cooling passage for allowing the passage of the hydraulic oil of the hydraulic CVT while cooling the hydraulic oil. The stand also serves as an oil cooler as well as supporting the power source.

Abstract: A wiring board simplifying connection of electronic parts mounted on a principal face side of the wiring board and chip capacitors mounted on a reverse face side thereof in such a manner that the wiring board 100 mounting the chip capacitors 160 on a reverse face 101c-side comprises bumps 129 capable of being connected to IC chip 10, first and second capacitor connecting pads 149p, 149g connecting the upper face parts 163 of the chip capacitors 160, a plurality of insulating layers 121, 111, 141 intervening the first and the second capacitor connecting pads, and first and second converting-conductor layers 146p, 146g in stripe pattern formed at interlayer 152, connected to the bumps 129 at the principal face 101b-side, connected to the first capacitor connecting pads 149p at the reverse face 101c-side or the second capacitor connecting pads 149g for changing the connecting positions or the connecting number between the principal face side and the reverse face side.

Abstract: To provide a cascode amplifying circuit having large amplifying gain without narrowing an output operational range or deteriorating response performance of the circuit even with a constitution by a small number of elements is achieved by applying negative feedback from the source to the gate of an MOS transistor M2 provided with an output terminal at the drain via the source and the drain of an MOS transistor M3 of N-channel type, the source and the drain of an MOS transistor M4 of P-channel type and a current mirror constituted by MOS transistors M5 and M6 of N-channel type. By this constitution, operation of the MOS transistor M3 is not effected with influence of lowering of voltage of the source of the MOS transistor M2, a wide output operational range is provided and mirror effect with respect to gate/drain capacitance of the MOS transistor is restrained to thereby restrain a reduction in response speed.

Abstract: A wiring board simplifying connection of electronic parts mounted on a principal face side of the wiring board and chip capacitors mounted on a reverse face side thereof in such a manner that the wiring board 100 mounting the chip capacitors 160 on a reverse face 101c-side comprises bumps 129 capable of being connected to IC chip 10, first and second capacitor connecting pads 149p, 149g connecting the upper face parts 163 of the chip capacitors 160, a plurality of insulating layers 121, 111, 141 intervening the first and the second capacitor connecting pads, and first and second converting-conductor layers 146p, 146g in stripe pattern formed at interlayer 152, connected to the bumps 129 at the principal face 101b-side, connected to the first capacitor connecting pads 149p at the reverse face 101c-side or the second capacitor connecting pads 149g for changing the connecting positions or the connecting number between the principal face side and the reverse face side.

Abstract: In a sample-and-hold circuit using a completely differential type operational amplifier circuit, to promote operational stability, to restrain a variation in a balance point of a middle value of differential output signals and to promote stability and accuracy of an A/D converter are achieved by a constitution as bellow.

Abstract: In a sample-and-hold circuit using a completely differential type operational amplifier circuit, to promote operational stability, to restrain a variation in a balance point of a middle value of differential output signals and to promote stability and accuracy of an A/D converter are achieved by a constitution as bellow.

Abstract: A differential comparison circuit capable of easily obtaining desired circuit accuracy and comparing differential signals with reduced influences of fluctuation of a power source voltage. Input/output terminals I/O1 and I/O2 of a latch circuit 1 are connected to the drain terminals of MOS transistors M1 and M2 having the same characteristics. Input terminals IN1 and IN2 are provided to the gate and source terminals of the MOS transistor M2, and input terminals IN3 and IN4 are provided to the gate and source terminals of the MOS transistor M2. A bias circuit 2 brings the MOS transistors M1 and M2 into the same bias state. The difference of the input signals supplied to the input terminals IN1 and IN2 is compared with the difference of the input signals supplied to the input terminals IN3 and IN4. Since the comparison result is outputted from the first and second input/output terminals I/O1 and I/O2, the input offset voltage does not affect the differential comparison circuit.

Abstract: A differential comparison circuit capable of easily obtaining desired circuit accuracy and comparing differential signals with reduced influences of fluctuation of a power source voltage.

Abstract: A wiring board simplifying connection of electronic parts mounted on a principal face side of the wiring board and chip capacitors mounted on a reverse face side thereof in such a manner that the wiring board 100 mounting the chip capacitors 160 on a reverse face 101c-side comprises bumps 129 capable of being connected to IC chip 10, first and second capacitor connecting pads 149p, 149g connecting the upper face parts 163 of the chip capacitors 160, a plurality of insulating layers 121, 111, 141 intervening the first and the second capacitor connecting pads, and first and second converting-conductor layers 146p, 146g in stripe pattern formed at interlayer 152, connected to the bumps 129 at the principal face 101b-side, connected to the first capacitor connecting pads 149p at the reverse face 10c-side or the second capacitor connecting pads 149g for changing the connecting positions or the connecting number at the principal face side and the reverse face side.

Abstract: To provide a cascode amplifying circuit having large amplifying gain without narrowing an output operational range or deteriorating response performance of the circuit even with a constitution by a small number of elements is achieved by applying negative feedback from the source to the gate of an MOS transistor M2 provided with an output terminal at the drain via the source and the drain of an MOS transistor M3 of N-channel type, the source and the drain of an MOS transistor M4 of P-channel type and a current mirror constituted by MOS transistors M5 and M6 of N-channel type. By this constitution, operation of the MOS transistor M3 is not effected with influence of lowering of voltage of the source of the MOS transistor M2, a wide output operational range is provided and mirror effect with respect to gate/drain capacitance of the MOS transistor is restrained to thereby restrain a reduction in response speed.