摘要:
A mold arranged between a pair of heater blocks for molding an optical element comprises a pair of first and second elements each having a molding surface for defining a cavity and an outer surface opposite to the molding surface and in contact with a corresponding heater block, and a ring member for guiding the first and second elements. The rear surface of at least one of the first and second elements has a part which is not in contact with the corresponding heater block. Also, another mold comprises a pair of first and second elements each having a molding surface for defining a cavity and an outer surface opposite to the molding surface, a first ring member for guiding the first and second elements, and a second outer ring member made of a material with a lower thermal conductivity than that of the first ring member. A molding method for optical elements is such that a glass with a viscosity of 10.sup.12 poise or more is fed to a mold with a temperature at or below the glass transition point, heated to a temperature corresponding to the glass viscosity of 10.sup.8 to 10.sup.10 poise and pressed for 3 to 90 seconds. The glass is then cooled at a rate of 1.5.degree. to 2.5.degree. C./sec to a viscosity of 10.sup.10 to 10.sup.11 poise and thereafter at a rate of 0.2.degree. to 1.5.degree. C./sec with the glass pressurized, and removed as an optical element at or below the glass transition point.
摘要:
A method and an apparatus for producing an optical element capable of performing a molding temperature control required for a plurality of independent molding blocks in a short period of time, and continuously and simultaneously producing a plurality of different optical elements having a high degree of accuracy at a low cost is provided.
摘要:
A microwave transmitting window for a plasma processing device. The window is a body of one or more pieces of the same or different dielectric materials. A surface of the window facing a microwave transmitting horn or waveguide is planar and extends perpendicularly to an axial direction. An opposite surface of the window is recessed such that the body has a non-uniform thickness between the two surfaces. The recessed surface can have various shapes and the overall size of the window can be equal to the size of a plasma formation chamber of the plasma processing device. The outlet of the plasma formation chamber can be formed in an end wall or the outlet can be formed by the inner periphery of the plasma formation chamber.
摘要:
A vehicle lamp includes: an LED mount on which an LED is placed; an attachment that fixes the LED to the LED mount; a power supply that supplies power to the LED; a first optical member that controls light emitted from the LED; and a second optical member that controls light emitted from the first optical member. The power supply and the first optical member are provided at the attachment.
摘要:
A screw compressor includes a casing having low and high pressure spaces, a screw rotor inserted in a cylinder part of the casing, and a slide valve disclosed in the cylinder part. The screw rotor has a plurality of helical grooves forming a compression chamber. The slide valve is moveable along an axis of the screw rotor and faces an outer periphery of the screw rotor to form a discharge port to communicating the compression chamber with the high pressure space. Fluid in the low pressure space is sucked into the compression chamber, compressed, and then discharged to the high-pressure space when the screw rotor rotates. The slide valve includes a sealing projection located on a back surface of the slide valve opposite to the screw rotor, and separating the low and high pressure spaces from each other when the sealing projection is in slidable contact with the casing.
摘要:
An elastic-wave filter device includes a first piezoelectric substrate, a second piezoelectric substrate, a first pillar-like wiring electrode, and a second pillar-like wiring electrode. The first and second substrates have a first and a second IDT electrodes on their top faces respectively. A lateral face of the second substrate confronts a lateral face of the first substrate. The first pillar-like electrode and the second pillar-like electrode are formed above the first and the second substrates respectively, and are electrically connected to the first and the second IDT electrodes respectively. The first substrate is thicker than the second substrate. A distance between a plane including the top face of the first substrate and a plane including the top face of the second substrate is smaller than a distance between a plane including an underside of the first substrate and a plane including an underside of the second substrate.
摘要:
A bipolar transistor is provided with an emitter layer, a base layer and a collector layer. The emitter layer is formed above a substrate and is an n-type conductive layer including a first nitride semiconductor. The base layer is formed on the emitter layer and is a p-type conductive including a second nitride semiconductor. The collector layer is formed on the base layer and includes a third nitride semiconductor. The collector layer, the base layer and the emitter layer are formed such that a crystal growth direction to the substrate surface is parallel to a substrate direction of [000-1]. The third nitride semiconductor contains InycAlxcGa1-xc-ycN (0•xc•1, 0•yc•1, 0
摘要:
Compression strains are generated at an interface between the cap layer and the barrier layer and an interface between the channel layer and the buffer layer and a tensile strain is generated at an interface between the barrier layer and the channel layer. Therefore, negative charge is higher than positive charge at the interface between the cap layer and the barrier layer and the interface between the channel layer and the buffer layer, while positive charge is higher than negative charge at the interface between the barrier layer and the channel. The channel layer has a stacked layer structure of a first layer, a second layer, and a third layer. The second layer has a higher electron affinity than those of the first layer and the third layer.
摘要:
An object of the present invention is to simplify a calibration operation of a camera and to shorten a time necessary for calibration. A camera calibration device 10 is mounted on a predetermined position of a movable object 100 and includes a camera 11 configured to take an image including an index 41 provided outside the movable object 100, an image superimposing unit 122 configured to generate a superimposed image by superimposing a calibration object 42 having a position adjustment part and a rotation adjustment part on the image taken by the camera 11, and a calculation unit 124 configured to calculate, based on a position of the calibration object 42 after being shifted in the superimposed image such that an end or a center of the index 41 meets the position adjustment part and a part of the index other than the end or the center overlaps the rotation adjustment part, parameters relative to a pan angle, a tilt angle and a roll angle for calibration of the camera mounting position.
摘要:
The present invention provides a semiconductor device having such a structure formed by sequentially laminating a lower barrier layer composed of lattice-relaxed AlxGa1-xN (0≦x≦1), a channel layer composed of InyGa1-yN (0≦y≦1) with compressive strain and a contact layer composed of AlzGa1-zN (0≦z≦1), wherein a two-dimensional electron gas is produced in the vicinity of an interface of said InyGa1-yN channel layer with said AlzGa1-zN contact layer; a gate electrode is formed so as to be embedded in the recessed portion with intervention of an insulating film, which recessed portion is formed by removing a part of said AlzGa1-zN contact layer by etching it away until said InyGa1-yN channel layer is exposed; and, ohmic electrodes are formed on the AlzGa1-zN contact layer. Thus, the semiconductor device has superior uniformity and reproducibility of the threshold voltage while maintaining a low gate leakage current, and is also applicable to the enhancement mode type.
摘要翻译:本发明提供一种具有这样的结构的半导体器件,该半导体器件通过依次层叠由晶格弛豫的Al x Ga 1-x N(0 @ x @ 1)构成的下阻挡层,由InyGa1-yN(0 @ y @ 1) 具有压应变和由Al z Ga 1-z N(0 @ z @ 1)组成的接触层,其中在所述In y Ga 1-y N沟道层与所述Al z Ga 1-z N接触层的界面附近产生二维电子气; 通过介入绝缘膜形成嵌入在凹陷部分中的栅电极,该凹陷部分通过蚀刻除去所述AlzGa1-zN接触层的一部分而形成,直到所述In y Ga 1-y N沟道层暴露 ; 并且在AlzGa1-zN接触层上形成欧姆电极。 因此,半导体器件在保持低栅极漏电流的同时具有优异的阈值电压的均匀性和再现性,并且也适用于增强型。