Abstract: It is an object of the present invention to provide a one-chip microcomputer which permits the access time for an external memory to be equal to that for an internal memory. The one-chip microcomputer 10 includes an internal ROM 11, control circuit 12, output terminals 13, input terminals 14, control circuit 15, selector 16, instruction register 17, delay circuit 18, and fetch control signal select gate 19. For selection of the external ROM 30, a control arrangement 20 and a delay circuit 18 are employed in one embodiment to adjust the time at which ROM data is fetched by the instruction register 17, based on the delay time for accessing the external ROM 30.

Abstract: A method of reducing metallic impurities in an ozone gas piping means, which entails producing ozone gas in an ozone-generating means and piping the produced ozone gas to stainless steel piping means, wherein the ozone gas is produced from a raw material oxygen gas containing at least one additional gas selected from the group consisting of nitrogen, helium, carbon dioxide, carbon monoxide and ozone; the additional gas being used in an amount of 0.025% by volume or more in total, with the proviso that nitrogen is not used as or in said additional gas in an amount of more than 1.0% by volume.

Abstract: A CPU core includes an internal resource made up of various kinds of registers, and a controller having a bus control circuit which controls the input and output of data and others among various kinds of buses. A terminal group has a plurality of terminals for interconnecting the CPU core to a peripheral circuit and an external memory. The buses comprise an internal bus to which individual circuits incorporated in the CPU core are interconnected, a data bus interconnected between the CPU core and the external memory for allowing data to be inputted and outputted between the CPU core and the external memory, and a peripheral data bus inerconnected between the CPU core and the peripheral circuit for allowing data to be inputted and outputted between the CPU core and the peripheral circuit. The input and output terminals of all of the circuit portions which constitute the internal resource are interconnected to the internal bus.

Abstract: A system and method for generating high concentration ozone by introducing a high purity oxygen (99.995% or greater purity) into a silent discharge type ozone generator. Another high purity gas (99.99% or greater), is mixed with the oxygen before the gas is introduced into the ozone generator. By this process, high concentration ozone is generated such that the ozone concentration does not decrease with time. The highest ozone concentrations are maintained when the non-oxygen gas makes up between 1% and 10% of the volume content of the gas mixture introduced in the ozone generator.

Abstract: In a microcomputer provided with a CPU which processes digital signals under control of program instructions, and a converter which converts between analog and digital signals, the operation of the converter is controlled to improve reliability and increase CPU efficiency. In response to a control output from the CPU a conversion control circuit passes an operation stop signal to the CPU during a limited period of conversion in which, for example, conversion accuracy is significantly influenced by CPU noise generation.

Abstract: A fuel interrupt/pressure release valve arrangement includes a casing mounted at an upper portion of an interior space of a fuel tank. The casing has openings for communicating the interior of the casing with an atmosphere the interior of the fuel tank. A valve housing is formed in the casing having a discharge opening at an upper end. The opening is closed by a stopper biased in a valve closing direction by a spring. A float is provided in the casing having an indentation for loosely receiving the valve housing and a through hole is formed through the float at an apex of the indentation corresponding to the position of the discharge opening of the valve housing. A protrusion formed on the float in the vicinity of the through hole so as to project in an opening direction of the valve so as to be normally in touching contact with the stopper.

Abstract: A valve device for controlling fuel vapor in a fuel tank is provided with a fuel-cut valve which is disposed between the fuel tank and a charcoal canister, and between a filler tube of the fuel tank and the charcoal canister. The fuel-cut valve is provided with a casing including upper and lower chambers. A lower float is disposed in the lower chamber and arranged to close the communication between a fuel tank and a charcoal canister when fuel height level in the fuel tank is raised to a first predetermined level. A upper float is disposed in the upper chamber and arranged to close the communication between the filler tube and the charcoal canister when the fuel height level in the filler tube is raised to a second predetermined level.

Abstract: A fuel check valve assembly for an automotive vehicle fuel tank includes a valve casing having a valve seat and a float valve movably installed in the valve casing for controlling opening and closing of the valve seat. The float valve consists of a valve float and a valve head cooperative with each other to define therebetween a sealingly closed chamber. The valve head is subjected on opposite sides thereof to a pressure within the sealingly closed chamber and a pressure within the fuel tank, respectively and movable relative to the valve float in response to a pressure differential across the valve head. The valve head is forced to move relative to the valve float and away from the valve seat to open the same when the pressure differential across the valve head is larger than a predetermined value.

Abstract: A fuel check valve assembly for use in a fuel tank has a valve seat which is movable upwardly together with a float valve upon increase of a pressure within the fuel tank. Upon further increase of the pressure within the fuel tank, the valve seat is separated from the float valve and solely moves upwards to open the aperture of the valve seat for venting fuel vapor in the fuel tank.

Abstract: A conveyor arm apparatus unloads one by one a plurality of wafers which are stored in a holding chamber such that a surface of one wafer faces a back surface of another wafer at a predetermined distance. Two beams parallel to a semiconductor wafer mounting surface of a conveyor arm are projected into the holding chamber and the two beams passing through a gap between adjacent wafers are detected. Thus, the relative position of the conveyor arm and the wafers in the holding chamber can be confirmed.

Abstract: A positioning apparatus for positioning a circular substrate having a notch in a circumferential edge includes a notch sensor which senses the rotational position of the substrate about a center axis, a pushing member adapted to fit into the notch and moved toward the center axis to displace the substrate so as to engage positioning elements, and a detector that detects the fitting of the pushing member in the notch, the detector being movable with the pushing member.

Abstract: A steam generator is proposed to spray steam in a beauty shop, a barbershop or the like. In the steam generator, a small amount of water is continuously supplied to a heated vapor assembly and is instantaneously converted to steam. A preparation time can be greatly shortened after the vapor assembly is heated. Thereafter, steam can be stably and continuously supplied. Discharge electrodes are arranged in a steam tube extending from the vapor assembly to effectively ionize the steam.