Abstract:
A plurality of heat receiving ribs are projected inwardly from the inner wall surfaces of a crankcase of a splashing oil lubrication type internal combustion engine. The heat receiving ribs extend in the same direction of a crankshaft so as to easily absorb heat from splashed engine oil. As a result, the temperature in the crankcase is reduced, thereby the lubrication characteristic of the engine oil can be maintained in good condition.
Abstract:
A method of forming a compound semiconductor device. The method includes the steps of depositing a film that contains zinc oxide and silicon oxide to contain the zinc oxide by 70 wt % or more on compound semiconductor layer as a diffusion source, and diffusing zinc from the diffusion source into the compound semiconductor layer by annealing. Accordingly, there can be provided a compound semiconductor device manufacturing method containing the step of diffusing zinc into compound semiconductor layers, capable of deepening a Zn diffusion position from a ZnO/SiO2 film to such extent that COD endurance of laser end face window structures can be increased rather than the prior art.
Abstract:
A main bearing case has a bearing holder for holding a bearing so as to support a crankshaft, and a crankcase mounting section at which it is joined to a crankcase. Rib walls are provided so as to surround the bearing holder between the bearing holder and the crankcase mounting section. The rib walls are formed in a side of the crankcase, and in a neighborhood of each inner side face of the bearing holder and the crankcase mounting section. These rib walls receive a force exerted in a radial direction from the crankshaft. Thereby, an improvement of rigidity of the main bearing case can be achieved, and also the lubrication to a valve-operating system can be always ensured by preventing an oil surface from lowering even when an engine is located with inclination.
Abstract:
A method for manufacturing a semiconductor device: forming a seed layer 22 on a semiconductor substrate 10 having a pad electrode 14; forming a protective layer 24 on the seed layer 22; forming a mask 30 having an opening 40 on the protective layer 24 above the pad electrode; etching the protective layer 24 exposed in the opening 40 to expose the seed layer 22; depositing a plating film 50 serving as a barrier metal on the seed layer 22; and forming a solder bump on the plating film 50. The seed layer is covered with the protective layer, and the protective layer 24 is selectively removed with respect to the seed layer 22 immediately before the plating step. As a result, it is possible to prevent the oxidation of the seed layer 22 in the step after the formation of the protective layer.
Abstract:
A hydrogen barrier layer is formed above a ferroelectric thin film in an integrated circuit. The hydrogen barrier layer is directly over a protected segment of the ferroelectric thin film, while a sacrificial segment of the ferroelectric thin film extends laterally beyond the edges of the hydrogen barrier layer. The sacrificial segment absorbs hydrogen so that it cannot diffuse laterally into the protected segment of the ferroelectric thin film. After it absorbs hydrogen, the sacrificial segment is etched away to allow electrical connection to circuit layers below it. The ferroelectric thin film preferably comprises a layered superlattice compound. Excess bismuth or niobium added to the standard precursor solution of a strontium bismuth tantalum niobate compound helps to reduce hydrogen degradation of the ferroelectric properties.
Abstract:
In an integrated circuit, a stack of thin film layers comprising respectively a bottom electrode, a thin film of metal oxide, a top electrode, a lower barrier-adhesion layer, a hydrogen barrier layer, and an upper barrier-adhesion layer are patterned to form a memory capacitor capped with a self-aligned hydrogen barrier layer. Preferably, the top and bottom electrodes comprise platinum, the metal oxide material comprises ferroelectric layered superlattice material, the upper and lower barrier-adhesion layers comprise titanium, and the hydrogen barrier layer comprises titanium nitride. The hydrogen barrier layer inhibits diffusion of hydrogen, thereby preventing hydrogen degradation of the metal oxides. Part of the upper barrier-adhesion layer is removed in order to increase the electrical conductivity in the layer. Preferably, the memory capacitor is a ferroelectric nonvolatile memory. Preferably, the layered superlattice material includes strontium bismuth tantalate or strontium bismuth tantalum niobate.
Abstract:
The semiconductor laser of the present invention has an active layer in which the output edge is formed into a V-shape or comprises a striped active layer which is present in a pumped region and whose light output edge is transversely bent.
Abstract:
A semiconductor laser includes a substrate having a (100) face as its main surface, where the substrate has a stripe of a first mesa extending in a direction of the substrate and including a (111)B face as its sloping surface, a buried layer formed on the substrate excluding a top surface of the stripe of the first mesa so that the (111)B face of the stripe of the first mesa is covered a sloping surface part of the buried layer, where the top surface of the stripe of the first mesa is the (100) face of the substrate and forms a stripe of a second mesa together with the sloping surface of the buried layer and the stripe of the second mesa has a smaller inclination than the stripe of the first mesa, and a double heterostructure made up of a plurality of semiconductor layers and formed on the stripe of the second mesa. The double heterostructure has a substantially trapezoidal cross section which is determined by the stripe of the second mesa.
Abstract:
A semiconductor laser includes a substrate having a (100) face as its main surface, where the substrate has a stripe of a first mesa extending in a direction of the substrate and including a (111)B face as its sloping surface, a buried layer formed on the substrate excluding a top surface of the stripe of the first mesa so that the (111)B face of the stripe of the first mesa is covered a sloping surface part of the buried layer, where the top surface of the stripe of the first mesa is the (100) face of the substrate and forms a stripe of a second mesa together with the sloping surface of the buried layer and the stripe of the second mesa has a smaller inclination than the stripe of the first mesa, and a double heterostructure made up of a plurality of semiconductor layers and formed on the stripe of the second mesa. The double heterostructure has a substantially trapezoidal cross section which is determined by the stripe of the second mesa.
Abstract:
A combustion chamber of an engine has a fuel injector provided for injecting fuel directly in the combustion chamber. An arc-shaped offset cavity is formed in a roof of the combustion chamber, and a fuel injector is located at a top of the cavity on the axis of the cylinder of the engine. A spark plug is located on the axis so as to ignite the fuel injected from the injector and passing the gap of the spark plug.