Abstract: A keyboard apparatus according to an embodiment includes a keyboard and a mutual capacitance proximity sensor. The keyboard includes a first key and a second key arranged in an array direction with respect to the first key. The proximity sensor includes a first electrode having a portion extending from at least a first area below the first key to a second area below the second key, a second electrode arranged in the first area, and a third electrode arranged in the second area. The proximity sensor is a mutual capacitance type sensor and is configured to use a change in capacitance between the first electrode and the second electrode and a change in capacitance between the first electrode and the third electrode.

Abstract: A vane pump includes an annular concave portion formed in an outer circumferential surface of the rotor, both side surfaces are inclined so as to approach each other towards a bottom surface.

Abstract: A capacitor that includes a substrate; a capacitor formation region in which one or more trenches are formed; a dummy region located between the capacitor formation region and an end of the substrate; a first electrode formed inside the one or more trenches to cover the capacitor formation region, and a dielectric film; a second electrode that covers the capacitor formation region and has a different potential from the first electrode; and an extended portion that formed in the dummy region. Moreover, the extended portion forms a recess or a protrusion on the substrate in a path from the second electrode to the end portion of the substrate.

Abstract: The information providing method includes: sequentially identifying a performance speed at which a user performs a piece of music; identifying, in the piece of music, a performance position that is performed by the user; setting an adjustment amount in accordance with a temporal variation in the identified performance speed; and providing the user with music information corresponding to a time point that is later, by the adjustment amount, than a time point that corresponds to the performance position identified in the piece of music.

Abstract: A capacitor that includes a substrate; a capacitor formation region in which one or more trenches are formed; a dummy region located between the capacitor formation region and an end of the substrate; a first electrode formed inside the one or more trenches to cover the capacitor formation region, and a dielectric film; a second electrode that covers the capacitor formation region and has a different potential from the first electrode; and an extended portion that formed in the dummy region. Moreover, the extended portion forms a recess or a protrusion on the substrate in a path from the second electrode to the end portion of the substrate.

Abstract: A vane pump includes a rotor; a plurality of vanes; a cam ring; a second side plate; a suction port provided in the second side plate, the suction port being configured to guide working fluid to the pump chambers; a pump cover arranged so as to sandwich the second side plate with the cam ring; and a low-pressure chamber formed in the pump cover, the low-pressure chamber having an opening portion communicating with the suction port. The suction port is arranged so as to be shifted towards a forward side of in a rotating direction of the rotor with respect to the opening portion of the low-pressure chamber.

Abstract: A control valve includes a seat portion through which the fluid passes, a poppet valve portion configured to move relative to the seat portion, a guide cylinder portion configured to guide the fluid having passed through the seat portion by an inner peripheral surface thereof, a poppet guide portion which is in sliding contact with the inner peripheral surface of the guide cylinder portion and supports the poppet valve portion, and a rectifying slit which is formed on at least one of the inner peripheral surface of the guide cylinder portion and an outer peripheral surface of the poppet guide portion.

Abstract: The information providing method includes: sequentially identifying a performance speed at which a user performs a piece of music; identifying, in the piece of music, a performance position that is performed by the user; setting an adjustment amount in accordance with a temporal variation in the identified performance speed; and providing the user with music information corresponding to a time point that is later, by the adjustment amount, than a time point that corresponds to the performance position identified in the piece of music.

Abstract: A control valve configured to control a pressure of a passing fluid includes: a valve seat having a seat portion where the fluid passes; a poppet valve inserted into the valve seat to regulate a pressure of the fluid passing through the seat portion; and a fluid rectifying unit provided in the valve seat to rectify the fluid having a pressure regulated by the poppet valve.

Abstract: A control valve includes a poppet valve moving in an axial direction relative to a seat hole so as to change a flow-path cross-sectional area of the seat hole and a spring disc biasing the poppet valve in a valve opening direction against the return spring. The spring disc includes: a secondary-pressure receiving surface being a portion moving along with a movement of the poppet valve, the secondary-pressure receiving surface configured to receive secondary pressure introduced to the secondary port; and a pilot-pressure receiving surface configured to receive pilot pressure serving as a reference pressure. The spring disc deforms elastically in accordance with pressure difference between the secondary pressure and the pilot pressure to cause the poppet valve to move in the axial direction.

Abstract: A poppet valve is provided with a seat portion which has a conical inner peripheral surface with a center axis, and a conical portion which is displaced along the center axis inside the seat portion, forms a flow passage having an annular cross-section between the conical portion and the seat portion and is supported at a position concentric with the seat portion. An effect of rectifying fluid flowing in the flow passage is thereby obtained and the generation of noise is prevented.

Abstract: A control valve includes a seat portion through which the fluid passes, a poppet valve portion configured to move relative to the seat portion, a guide cylinder portion configured to guide the fluid having passed through the seat portion by an inner peripheral surface thereof, a poppet guide portion which is in sliding contact with the inner peripheral surface of the guide cylinder portion and supports the poppet valve portion, and a rectifying slit which is formed on at least one of the inner peripheral surface of the guide cylinder portion and an outer peripheral surface of the poppet guide portion.

Abstract: This invention is a high pressure gas container into which a high pressure gas is charged, includes: a liner into which the high pressure gas is charged; and a reinforcing sleeve that envelops an outer surface of the liner, wherein the liner includes: a cylindrical liner trunk portion; and a pair of liner shoulder portions formed by reducing a diameter of respective end portions of the liner trunk portion, and the reinforcing sleeve includes: a sleeve trunk portion fitted to the liner trunk portion; and a pair of sleeve shoulder portions that extend from the sleeve trunk portion so as to contact the respective liner shoulder portions.

Abstract: A hydrogen storage container that stores hydrogen gas using a hydrogen storage material capable of storing hydrogen gas includes: a hollow liner that stores the hydrogen gas and includes a liner opening portion into which the hydrogen gas is introduced; a hollow sub-tank disposed inside the liner to house the hydrogen storage material; a heat exchange pipe which is disposed inside the sub-tank and through which a heat exchange medium passes; a sub-tank support portion that supports an end portion of the sub-tank relative to the liner opening portion and supports an end portion of the heat exchange pipe; and a heat exchange medium passage that is formed to penetrate the sub-tank support portion and leads the heat exchange medium to the heat exchange pipe.

Abstract: A control valve includes a seat portion through which the fluid passes, a poppet which has a valve body portion and is configured to move relative to the seat portion, and a poppet throttle passage defined between the seat portion and the valve body portion. The poppet throttle passage is formed to gradually increase a flow passage area in a horizontal cross-section perpendicular to center axes of the seat portion and the valve body portion from an upstream side to a downstream side.

Abstract: A musical-performance analysis device includes: an acquisition section that acquires performance information of a player; a determination section that determines, by comparing the performance information acquired by the acquisition section with reference information indicating a reference of a performance, among performance segments different from one another, a performance segment in which a difference degree between the performance information acquired by the acquisition section and the reference information is large and a performance segment in which the difference degree between the performance information acquired by the acquisition section and the reference information is small; and the specification section that specifies a tendency of the performance on the basis of the difference degree of the performance segment in which the difference degree has been determined to be small by the determination section.

Abstract: A control valve includes a poppet valve moving in an axial direction relative to a seat hole so as to change a flow-path cross-sectional area of the seat hole and a spring disc biasing the poppet valve in a valve opening direction against the return spring. The spring disc includes: a secondary-pressure receiving surface being a portion moving along with a movement of the poppet valve, the secondary-pressure receiving surface configured to receive secondary pressure introduced to the secondary port; and a pilot-pressure receiving surface configured to receive pilot pressure serving as a reference pressure. The spring disc deforms elastically in accordance with pressure difference between the secondary pressure and the pilot pressure to cause the poppet valve to move in the axial direction.

Abstract: A chord detection apparatus retrieves musical performance data indicative of musical performance played by a user, retrieves musical piece information indicative of a musical piece played by the user, retrieves chord tendency information indicative of degrees of likelihood or unlikelihood of chords appearing in the musical piece, and detects a chord on the basis of the retrieved musical performance data and the retrieved chord tendency information.

Abstract: A poppet valve is provided with a seat portion which has a conical inner peripheral surface with a center axis, and a conical portion which is displaced along the center axis inside the seat portion, forms a flow passage having an annular cross-section between the conical portion and the seat portion and is supported at a position concentric with the seat portion. An effect of rectifying fluid flowing in the flow passage is thereby obtained and the generation of noise is prevented.

Abstract: A control valve configured to control a pressure of a passing fluid includes: a valve seat having a seat portion where the fluid passes; a poppet valve inserted into the valve seat to regulate a pressure of the fluid passing through the seat portion; and a fluid rectifying unit provided in the valve seat to rectify the fluid having a pressure regulated by the poppet valve.