Shibaura Machine Co., Ltd.

Provided is a deep ultraviolet LED having an improved light extraction efficiency (LEE). The deep ultraviolet LED with an emission wavelength λ includes, in order from an opposite side of a substrate: a p-type electrode layer made of indium tin oxide (ITO); a p-GaN contact layer; a p-AlGaN layer transparent to the wavelength λ; an electron barrier layer transparent to the wavelength λ; a multi-quantum well layer transparent to the wavelength λ; and a n-AlGaN layer transparent to the wavelength λ. The deep ultraviolet LED includes a photonic crystal periodic structure having a plurality of pillars within a range in a thickness direction from an upper portion of the p-type electrode layer to an inside of the n-AlGaN layer, in a direction of the substrate. The photonic crystal periodic structure has a photonic band gap that is open to a TM polarized component. A period a of the photonic crystal periodic structure satisfies a Bragg condition (m×λ/n eff =2a, m: order, n eff : effective refractive index of the photonic crystal periodic structure) with respect to a light with the wavelength λ, the order m satisfies 3≤m≤7, and a radius R of the pillar satisfies 0.25≤R/a≤0.35.

A control method for an injection molding machine includes a measurement process of feeding a quantity of molten resin along a length of a heating barrel by moving a screw backward while rotating the screw in the heating barrel for melting a resin material, during the measurement process before the measurement process is completed, reducing a rotational speed of the screw at a same time as reducing a backward movement speed of the screw, stopping backward movement of the screw when the measurement process is completed, and the rotational speed and a rotation direction of the screw are controlled such that a back pressure becomes a target pressure at a target time lower than the back pressure that is measured at a time when the measurement process is completed, and injecting the molten resin into a mold after reaching the target time.

An extruder has a pair of linkage parts configured to respectively link end portions of a pair of output shafts of the speed reducer with end portions of a pair of screws coaxially. The linkage parts each has: a coupling having an insertion hole into which the end portion of the screw and the end portion of the output shaft are inserted; and a locking part attached to the end portion of the output shaft. The coupling has a first receiving portion configured to receive the end portion of the output shaft; the second receiving portion configured to receive the locking part; and a step portion formed between the first receiving portion and the second receiving portion. As the step portion is locked by the locking part, a relative movement of the coupling relative to the output shaft in a direction towards the screw is restricted.

A molded foam manufacturing apparatus 1 includes a cylinder 2 in which a plasticization zone 21 where a thermoplastic resin is plasticized and melted, a starvation zone 22 where the molten resin is put into a starvation state and an injected physical foaming agent is dissolved in the molten resin, and a feeding zone 23 where the molten resin in which the physical foaming agent is dissolved is compressed and metered are provided in this order from an upstream side, and a screw 3 that is installed inside the cylinder 2 so as to be freely rotatable around an axis of the cylinder and has flights formed in a spiral shape on an outer circumference of a shaft 31 , wherein a lead angle R of the flights of the screw 3 corresponding to the feeding zone 23 is set smaller than a lead angle α of the flight corresponding to the starvation zone 22 , and the number of pieces of the flight of the screw 3 corresponding to the feeding zone 23 is set smaller than the number of pieces of the flight corresponding to the starvation zone 22 . In this way, it is possible to prevent a decrease in the flow rate of the molten resin transported in the starvation zone and the feeding sone and manufacture high-quality molded foams with high production efficiency.

A foam molding method includes: moving a screw backward to take air into a heating barrel through a nozzle part in a state in which a shut-off nozzle is opened, the shut-off nozzle that opens or closes the nozzle part for injecting the molten resin and is disposed on a heating barrel; closing the shut-off nozzle and moving the screw forward, to diffuse the air taken into the heating barrel, in the molten resin in the heating barrel; feeding the molten resin forward while dispersing the air as the air bubbles in the molten resin by moving the screw backward while rotating it in a state in which the shut-off nozzle is closed; and opening the shut-off nozzle, to inject the molten resin containing the dispersed air bubbles into the cavity.

A production device for melt-blown non-woven fabric, with which a high molecular weight polymer can be reduced in molecular weight by applying a shear force to the high molecular weight polymer without adding an additive such as a peroxide that promotes thermal decomposition reaction, and a low molecular weight polymer can be efficiently produced. The low molecular weight polymer and the melt-blown non-woven fabric are produced using a continuous high shearing device that applies a shear force to the high molecular weight polymer serving as a raw material by rotation of a screw body 37 to reduce the molecular weight of the high molecular weight polymer so as to obtain a low molecular weight polymer, and cools the low molecular weight polymer by passing the low molecular weight polymer through a passage 88 arranged in the axial direction inside the screw body 37.

A mold clamping device includes: a fixed die having a fixed mold; a movable die having a movable mold; a toggle link coupled to a link housing placed opposite to the fixed die and the movable die, and changing a distance therebetween by a mold clamping motor; a tie bar coupled to the fixed die and the link housing; a tie bar nut screwed onto the tie bar and placed on the link housing; and a control device that, when performing mold clamping, brings the movable mold close to the fixed mold at a slow speed immediately before the both come into contact with each other, stops the mold clamping motor for a predetermined period when the movable mold and the fixed mold come into contact with each other, increases the rotation speed of the mold clamping motor after the predetermined period elapses, to perform mold clamping.

A friction stir welding device includes a table that has a placement surface on which a workpiece is to be placed and is rotatable about a table rotation axis intersecting the placement surface, a tool holder movable relative to the table in a direction along the placement surface and rotatable about a holder rotation axis parallel to the table rotation axis, and a welding tool supported by the tool holder and rotating about a tool rotation axis intersecting the holder rotation axis. A control device has a biaxial operation mode in which the welding tool in a rotating state is pressed against a welding portion of a side surface of the workpiece, the welding tool is relatively moved along the welding portion by rotating the table, and the tool holder is rotated so that the welding tool is directed in a normal direction of the welding portion.

A flow rate adjustment valve includes: a flow path portion which has one end at which an opening is formed, and in which a fluid flows; a lifting valve which is configured to close the opening by covering an entire region of the opening, open the opening by being separated from the opening in an opening direction of the opening, and change a distance from the opening in the opening direction to change a flow area with respect to the opening; and a servo actuator as a driver which moves the lifting valve in the opening direction based on a predetermined detection value.

A surface treatment device includes a housing unit, a surface treatment element, and a stirring element. The housing unit houses a workpiece. The surface treatment element performs surface treatment on the workpiece housed in the housing unit. The stirring element stirs the workpiece when the surface treatment element performs the surface treatment on the workpiece.