摘要:
A flow control valve includes a light emitting section for emitting light; a light receiving section disposed so as to face the light emitting section, for detecting the amount of light received from the light emitting section; and a valve element for opening and closing a passage, wherein the valve element or a light blocking section secured to the valve element moves in a transverse direction between the light emitting section and the light receiving section as the passage is opened or closed, an amount of light received by the light receiving section from the light emitting section varies in accordance with the position of the valve element, and a position of the valve element is detected based on the amount of light received by the light receiving section.
摘要:
A shutoff valve according to the present invention includes: a motor configured to cause a rotating shaft to rotate; a lead screw formed on the rotating shaft; a lead nut into which the lead screw is screwed; and a valve element configured to block a passage, the valve element being configured to move in an axial direction in accordance with rotation of the rotating shaft. A dry lubricating coating is formed on a contact surface where the lead screw and the lead nut come into contact with each other. A thread pitch of the lead screw is set such that a current applied to the motor, the current being in relation to an inductance of the motor, is in a range that does not cause explosion of the fuel gas and that allows thrust force necessary for moving the valve element to be obtained.
摘要:
A shutoff valve according to the present invention includes: a motor configured to cause a rotating shaft to rotate; a lead screw formed on the rotating shaft; a lead nut into which the lead screw is screwed; and a valve element configured to block a passage, the valve element being configured to move in an axial direction in accordance with rotation of the rotating shaft. A dry lubricating coating is formed on a contact surface where the lead screw and the lead nut come into contact with each other. A thread pitch of the lead screw is set such that a current applied to the motor, the current being in relation to an inductance of the motor, is in a range that does not cause explosion of the fuel gas and that allows thrust force necessary for moving the valve element to be obtained.
摘要:
An engine includes a crank chamber in which pressure fluctuation occurs and a carburetor including a diaphragm fuel pump. The diaphragm fuel pump includes a pump chamber configured to suck in and eject fuel and a diaphragm chamber to which a pressure that drives the pump chamber is supplied. The diaphragm chamber and the crank chamber communicate with one another in a state in which a negative pressure is created in the crank chamber.
摘要:
An optical transmitter including: an optical module; an interconnecting circuit board configured to be electrically coupled to the optical module; and a printed circuit board configured to be electrically coupled to the interconnecting circuit board; wherein the interconnecting circuit board includes: a coplanar waveguide; and a microstrip line including a signal wiring line extended from an end of the coplanar waveguide and a ground wiring line, wherein the width of the signal wiring line is narrower than the width of a signal wiring line of the coplanar waveguide, and the spacing between the signal wiring line extended from the end of the coplanar waveguide and the ground wiring line is smaller than the spacing between the signal wiring line of the coplanar waveguide and the ground wiring line.
摘要:
The invention includes: powder preparation step of obtaining magnetic core powders by mixing, of magnetic powders with thermosetting resin powders in hot state; powder filling step of filling the obtained magnetic core powders into a die; a compaction step of compacting magnetic core powders; and compact heating step of heating, compacts to the elevated temperature state at which the thermosetting resin hardens after compaction.
摘要:
A printed circuit board (PCB) has a connection ground pattern and a wiring ground pattern. The connection ground pattern is a pattern for soldered connection formed on a first wiring layer. The wiring ground pattern is formed to be spaced from the connection ground pattern on the first wiring layer. The connection ground pattern and the wiring ground pattern are electrically coupled via a second wiring layer. When the wiring ground pattern is covered with an insulating layer, such as a solder resist, even if the position of an end of the insulating layer varies among wiring ground patterns, an influence on an exposed area of the connection ground pattern is eliminated.
摘要:
A mach-zehnder optical modulator includes a substrate having electrooptical effect, wherein: the substrate has an inputting waveguide portion, two intermediate waveguide portions, an outputting waveguide portion and a sub optical waveguide portion, the inputting waveguide portion being branched and coupled to the two intermediate waveguide portions, the two intermediate waveguide portions being combined and coupled to the outputting waveguide portion, the sub optical waveguide being provided on at least one side of the outputting optical waveguide portion and having a given distance from the outputting optical waveguide portion, the sub optical waveguide portion guiding an off-light emitted from a combining portion of the two intermediate waveguide portions; and a width of a starting point of the sub optical waveguide portion is larger than the outputting waveguide portion.
摘要:
A lubrication apparatus for a four-stroke engine that prevents lubrication failure from occurring around the crankshaft and reliably prevents oil from remaining in a valve operating chamber includes: an intake part positioned below the level of an oil A in an oil reservoir even if the oil reservoir is tilted and the level of the oil A changes; an oil feeding passageway that sucks up the oil A from the intake part and supplies the oil A to the crank chamber; and an direct passageway that allows communication between a valve operating chamber and a crank chamber when a negative pressure is created in the crank chamber. Open end parts of the oil feeding passageway and the direct passageway which are open in the crank chamber are provided to open as the piston moves from a position near the top dead center to the top dead center.
摘要:
An optical modulator including: a substrate which has electro-optic effect; a Mach-Zehnder optical interferometer which is formed in the substrate and which includes a first waveguide and a second waveguide; a signal electrode which applies an electrical field to the Mach-Zehnder optical interferometer through being supplied with an electric signal corresponding to a signal for optical modulation; a ground electrode formed apart from the signal electrode; and a conductor section which is narrow in a middle thereof along the light propagating direction and which gradually becomes wider towards the starting end and the terminating ends thereof along the light propagating direction in an interacting portion at which the electric field applied by the signal electrode interacts with light propagating through the first waveguide and the second waveguide.