Abstract: An electroacoustic transducer has a housing, piezoelectric speaker, dynamic speaker, and support member. The piezoelectric speaker includes a vibration plate having a first surface and a second surface on the opposite side of the first surface, as well as a piezoelectric element joined to at least one of the first surface and second surface, and divides the interior of the housing into a first space facing the first surface and a second space facing the second surface. The dynamic speaker is placed in the first space. The support member is constituted by a part of the housing or by a member different from the housing, has a supporting part facing the first surface or second surface, and supports the periphery of the first surface or second surface with the supporting part.

Abstract: In a die casting apparatus, during feeding of molten metal by an electromagnetic pump, a molten metal level sensor repeatedly detects a during-feeding level of the molten metal stored in a molten metal holding furnace; a control unit corrects a molten metal feeding voltage to a during-feeding voltage based on the repeatedly detected during-feeding level of the molten metal such that an amount of the molten metal fed by the electromagnetic pump coincides with a prescribed amount; the control unit applies the during-feeding voltage to the electromagnetic pump to cause the electromagnetic pump to feed the molten metal from the molten metal holding furnace into a plunger sleeve; and casting is performed through an injecting operation in which the molten metal fed into the plunger sleeve is extruded by a plunger tip to be injected into a cavity.

Abstract: In an embodiment, an electroacoustic transducer has a piezoelectric speaker 20, housing, and support member 23. The piezoelectric speaker 20 has a vibration plate 11 with a periphery 111, and a piezoelectric element 12 joined to the vibration plate 11. The housing houses the piezoelectric speaker 20. The support member 23 is constituted by a part of the housing or by a separate member, and supports the vibration plate 11 in multiple areas along the periphery 111. The electroacoustic transducer can offer excellent high-frequency characteristics.

Abstract: A method for processing a metal-cast article according to an aspect of the present invention includes a correcting step of starting to pressurize the metal-cast article by a press machine (10, 20) before a temperature of the metal-cast article 40 decreases to 200° C. or lower after casting is finished. Distortion can be accurately removed in a correction of a metal-cast article. Further, since there is no need to heat the metal-cast article again for the correction, the productivity and energy efficiency can be improved.

Abstract: An exhaust gas cooling device, which cools exhaust gas from an internal combustion engine mounted on a vehicle through heat exchange between the exhaust gas and a coolant, includes: a plurality of tubes through which the exhaust gas flows; a tubular shell which houses the plurality of tubes and is configured to allow the coolant to flow therethrough; and a header plate disposed at an end portion in the shell to prevent the coolant from flowing out of the shell. The header plate includes support holes in which end portions of the plurality of the tubes are fitted and supported, and each of axial end faces of the plurality of tubes is located in the corresponding support hole at a position between both ends of the header plate in a thickness direction of the header plate.

Abstract: An exhaust gas cooling device, which cools exhaust gas from an internal combustion engine mounted on a vehicle through heat exchange between the exhaust gas and a coolant, includes: a plurality of tubes through which the exhaust gas flows; a tubular shell which houses the plurality of tubes and is configured to allow the coolant to flow therethrough; and a header plate disposed at an end portion in the shell to prevent the coolant from flowing out of the shell. The header plate includes support holes in which end portions of the plurality of the tubes are fitted and supported, and each of axial end faces of the plurality of tubes is located in the corresponding support hole at a position between both ends of the header plate in a thickness direction of the header plate.

Abstract: A scanning acoustic tomograph has a water tank which accommodates water, a sample stand which is disposed in the water tank and on which a subject is placed, a first ultrasonic transducer which irradiates ultrasonic waves toward the subject, and a second ultrasonic transducer which receives the ultrasonic waves transmitted through the subject, the first and second ultrasonic transducers are disposed opposed to each other in a vertical direction, and a hydrophilic film is formed on a lower surface side of the sample stand.

Abstract: In an EGR valve, a valve element is moved with respect to a valve seat to adjust a passage section width of a measuring section, thereby regulating an EGR gas flow rate in a passage. The valve seat includes a valve hole, a first end face facing to a downstream side of the passage and a second end face facing to an upstream side of the passage. The inner circumferential surface of the valve hole has a concave curved shape with an inner diameter gradually increasing toward the second end face. The valve element is placed inside the valve hole to be movable in between a fully closed position and a fully open position. While the valve element is placed in the fully open position, passage section widths of parts of the measuring section in an EGR gas flow direction are approximate to each other.

Abstract: A piezoelectric speaker has a piezoelectric element and vibration plate. The piezoelectric element has a base body with a mounting surface, as well as first and second terminals that are formed on the mounting surface with a distance between them. The vibration plate has a conductive body joined to the piezoelectric element and having a principle surface facing the mounting surface, as well as a first hole with or without a bottom which is formed on the principle surface in a region facing the first terminal to form a space between the body and first terminal. The piezoelectric speaker is capable of preventing the external electrodes of the piezoelectric element from shorting to each other.

Abstract: A die casting apparatus includes: an electromagnetic pump body disposed at a plunger sleeve-side end portion of a molten metal holding furnace; and a connecting pipe connected to the electromagnetic pump body and the plunger sleeve to provide communication between the electromagnetic pump body and a molten metal feed port, the connecting pipe being separable from the electromagnetic pump body. The die casting apparatus further includes a moving mechanism configured to allow the electromagnetic pump body to move between an inclined state where the electromagnetic pump body is inclined with respect to a horizontal plane in the molten metal holding furnace at an angle of approximately 45 degrees and an upright state where the electromagnetic pump body is perpendicular to the horizontal plane in the molten metal holding furnace.

Abstract: In an embodiment, an electroacoustic transducer has a piezoelectric speaker 20, housing, and support member 23. The piezoelectric speaker 20 has a vibration plate 11 with a periphery 111, and a piezoelectric element 12 joined to the vibration plate 11. The housing houses the piezoelectric speaker 20. The support member 23 is constituted by a part of the housing or by a separate member, and supports the vibration plate 11 in multiple areas along the periphery 111. The electroacoustic transducer can offer excellent high-frequency characteristics.

Abstract: An electroacoustic transducer has a housing, piezoelectric speaker, dynamic speaker, and support member. The piezoelectric speaker includes a vibration plate having a first surface and a second surface on the opposite side of the first surface, as well as a piezoelectric element joined to at least one of the first surface and second surface, and divides the interior of the housing into a first space facing the first surface and a second space facing the second surface. The dynamic speaker is placed in the first space. The support member is constituted by a part of the housing or by a member different from the housing, has a supporting part facing the first surface or second surface, and supports the periphery of the first surface or second surface with the supporting part.

Abstract: In an embodiment, an electroacoustic transducer has a piezoelectric speaker 20, housing, support member 73, and elastically deformable adhesive layer 74. The piezoelectric speaker 20 has a vibration plate 11 with a periphery 111, and a piezoelectric element 12 joined to the vibration plate 11. The housing houses the piezoelectric speaker 20. The support member 73 is constituted by a part of the housing or by a separate member, and supports the periphery 111. The adhesive layer 74 is provided between the periphery 111 and support member 73. The electroacoustic transducer can offer excellent high-frequency characteristics.

Abstract: The invention provides a die casting apparatus which pumps up molten metal from a molten metal holding furnace through an electromagnetic pump pipe provided with an electromagnetic pump, supplies the pumped-up molten metal to an injection sleeve through the molten metal supply pipe connected with the electromagnetic pump pipe, and a cavity of a die is charged with the molten metal by injecting the molten metal by using an injection tip. An upper end side of the electromagnetic pump pipe and an upper end side of the molten metal supply pipe are connected with each other. The upper end side of the electromagnetic pump pipe is inserted into the upper end side of the molten metal supply pipe, and extends inside the molten metal supply pipe.

Abstract: A die casting apparatus includes: an electromagnetic pump body disposed at a plunger sleeve-side end portion of a molten metal holding furnace; and a connecting pipe connected to the electromagnetic pump body and the plunger sleeve to provide communication between the electromagnetic pump body and a molten metal feed port, the connecting pipe being separable from the electromagnetic pump body. The die casting apparatus further includes a moving mechanism configured to allow the electromagnetic pump body to move between an inclined state where the electromagnetic pump body is inclined with respect to a horizontal plane in the molten metal holding furnace at an angle of approximately 45 degrees and an upright state where the electromagnetic pump body is perpendicular to the horizontal plane in the molten metal holding furnace.

Abstract: In a die casting apparatus, during feeding of molten metal by an electromagnetic pump, a molten metal level sensor repeatedly detects a during-feeding level of the molten metal stored in a molten metal holding furnace; a control unit corrects a molten metal feeding voltage to a during-feeding voltage based on the repeatedly detected during-feeding level of the molten metal such that an amount of the molten metal fed by the electromagnetic pump coincides with a prescribed amount; the control unit applies the during-feeding voltage to the electromagnetic pump to cause the electromagnetic pump to feed the molten metal from the molten metal holding furnace into a plunger sleeve; and casting is performed through an injecting operation in which the molten metal fed into the plunger sleeve is extruded by a plunger tip to be injected into a cavity.

Abstract: The invention provides a die casting apparatus which pumps up molten metal from a molten metal holding furnace through an electromagnetic pump pipe provided with an electromagnetic pump, supplies the pumped-up molten metal to an injection sleeve through the molten metal supply pipe connected with the electromagnetic pump pipe, and a cavity of a die is charged with the molten metal by injecting the molten metal by using an injection tip. An upper end side of the electromagnetic pump pipe and an upper end side of the molten metal supply pipe are connected with each other. The upper end side of the electromagnetic pump pipe is inserted into the upper end side of the molten metal supply pipe, and extends inside the molten metal supply pipe.

Abstract: A display panel driving device has a signal line driver. The signal line driver applies a pixel driving voltage based on an input image signal to each signal line of a display panel at a timing corresponding to a clock signal. The signal line driver is divided into a plurality of driver chips connected in cascade by the clock line. The display panel driving device supplies a clock signal through the driver chips. The duty ratio of the clock signal is stabilized when the clock signal passes through the driver chips, without leading to an increase in power consumption and in manufacturing costs.

Abstract: An ink-jet recording head includes a recording head and pressure damper assembly module including a recording head part at a lower position having nozzle holes on an under surface and an ink passage communicating with the nozzle holes, and a pressure damper part higher than the recording head part having an ink containing chamber inside. The ink-jet recording head further includes first flexible tube supplying ink in the ink containing chamber to the ink passage and connecting an ink discharge part communicating with the ink containing chamber and an ink supply part at one end side in the recording head part communicating with one end of the ink passage; and a second flexible tube connected with another end side in the recording head part and communicating with another end of the ink passage. At least the inside of the first flexible tube is filled with the ink.

Abstract: An exhaust gas cooling device, which cools exhaust gas from an internal combustion engine mounted on a vehicle through heat exchange between the exhaust gas and a coolant, includes: a plurality of tubes through which the exhaust gas flows; a tubular shell which houses the plurality of tubes and is configured to allow the coolant to flow therethrough; and a header plate disposed at an end portion in the shell to prevent the coolant from flowing out of the shell. The header plate includes support holes in which end portions of the plurality of the tubes are fitted and supported, and each of axial end faces of the plurality of tubes is located in the corresponding support hole at a position between both ends of the header plate in a thickness direction of the header plate.