摘要:
A field-effect transistor which comprises a buffer layer and a barrier layer each of which is made of a Group III nitride compound semiconductor and has a channel at the interface inside of the buffer layer to the barrier layer, wherein the barrier layer has multiple-layer structure comprising an abruct interface providing layer which composes the lowest semiconductor layer in said barrier layer and whose composition varies rapidly at the interface of said buffer layer, and an electrode connection plane providing layer which constructs the uppermost semiconductor layer and whose upper surface is formed flat.
摘要:
A display apparatus includes a light source which is configured to emit a light, a first light modulation unit which is configured modulate the light emitted from said light source, a first drive unit which is configured to drive said first light modulation unit, a projection unit, which is configured to project the light from said first light modulation unit enlargedly, a second light modulation unit, which is configured to modulate the light emitted from said projection unit so as to be emitted to an observer side, a second drive unit which is configured to drive said second light modulation unit, and an optical direction conversion unit, which is configured to convert the light from said projection unit so that the light is incident upon an incident surface of said second light modulation unit in a direction approximately perpendicular thereto.
摘要:
A heat transport device includes a working fluid, a capillary member, and a container. The working fluid transports heat by performing a phase change. The capillary member applies a capillary force to the working fluid. The capillary member includes a first mesh member having a mesh of a first size and a second mesh member having a mesh of a second size different from the first size. The second mesh member is folded so that the first mesh member is sandwiched. The container contains the working fluid and the capillary member.
摘要:
A projection-type image display apparatus includes an image display element, a light source unit, an enlarging projection optical unit, and a display controller portion. The enlarging projection optical unit, includes a projection lens, a group of lenses which are disposed on a same optical axis, sequentially arranged from a side of the image display element and which include at least one lens having a lens surface, and a reflection mirror having a reflection surface which is disposed between the group of lenses and a display portion. The image display element has a display surface larger than a display surface of the display portion, when an entirety of the image display element is enlargedly projected on the display portion through the enlarging projection optical unit; and the display controller portion enables movement of the image on the display surface of the image display element.
摘要:
A projection optical unit for a projection display apparatus, which displays an image upon a projection surface, obliquely, includes a front lens group disposed in a direction from an image display element to a projection surface, a rear lens group, and a reflection mirror formed so that a curvature of a portion for reflecting a light beam incident upon a lower end portion of the projection surface is larger than a curvature of a portion for reflecting a light beam incident upon an upper end of the projection surface. An optical axis of the front lens group and the rear lens group is more inclined with respect to a direction of the portion of the reflection mirror for reflecting the light beam incident upon the lower end portion of the projection surface than a normal line direction of the image display element.
摘要:
An object of the invention is to carry out the flux method with improved work efficiency while maintaining the purity of flux at high level and saving flux material cost. The sodium-purifying apparatus includes a sodium-holding-and-management apparatus for maintaining purified sodium (Na) in a liquid state. Liquid sodium is supplied into a sodium-holding-and-management apparatus through a liquid-sodium supply piping maintained at 100° C. to 200° C. The sodium-holding-and-management apparatus further has an argon-gas-purifying apparatus for controlling the condition of argon (Ar) gas that fills the internal space thereof. Thus, by opening and closing a faucet at desired timing, purified liquid sodium (Na) supplied from the sodium-purifying apparatus can be introduced into a crucible as appropriate via the liquid-sodium supply piping, the sodium-holding-and-management apparatus, and the piping.
摘要:
A projection-type display apparatus, comprises a front lens group having a plural number of lenses, each having rotationally symmetric surface configuration, a rear lens group, being disposed in rear of the front lens group, including a refractive lens for diverting a light and having a rotationally symmetric surface configuration, and a plural number of free curved surface lenses, each having a rotationally asymmetric free curved surface configuration, and a reflection mirror, being disposed in rear of the rear lens group, having a convex configuration into a direction of reflection of light and a rotationally asymmetric free curved surface configuration, at least in a part thereof.
摘要:
In a method for driving a micro mirror such as MEMS mirror and a display apparatus using the method, there are provided a mirror driving unit for driving the micro mirror which operates in a resonant mode and a nonresonant mode, a driving-condition setting unit for setting a mirror driving condition, a switching unit for switching on/off a mirror driving signal in the nonresonant mode, and a look-up table for indicating the relationship of a mirror response with respect to the driving condition already known in advance. The switching unit controls the transmission of the nonresonant-mode mirror driving signal while grasping the mirror response state with respect to the mirror driving signal, thereby finely increasing and decreasing a driving torque for the micro mirror. This fine increase and decrease allows the micro mirror to be fluctuated stably, and a further enhancement in the fluctuation rate.
摘要:
A light emitting element having a light emitting element portion formed of a group III nitride-based compound semiconductor and having a layer to emit light. The light emitting element portion is formed by lifting off a substrate by wet etching after the light emitting element portion is grown on the substrate. The light emitting element portion has a lift-off surface that is kept substantially intact as it is formed in growing the light emitting element portion on the substrate.
摘要:
A semiconductor device having an AlGaN—GaN heterojunction structure including an AlGaN layer and a GaN layer which device exhibits no changes over time in sheet resistance.As shown in FIG. 1, in a semiconductor device having an AlGaN—GaN heterojunction structure including an AlGaN layer 1 and a GaN layer 2, when the Al molar fraction of AlGaN (x %) and the thickness of the AlGaN layer (y nm) satisfy the relations: x+y
摘要翻译:具有包括AlGaN层和GaN层的AlGaN-GaN异质结结构的半导体器件,该器件在薄层电阻上随时间呈现不变化。 如图所示。 如图1所示,在具有包括AlGaN层1和GaN层2的AlGaN-GaN异质结结构的半导体器件中,当AlGaN的Al摩尔分数(x%)和AlGaN层的厚度(ynm)满足以下关系时: x + y <55,25 <= x <= 40,y> = 10,y小于临界厚度,从而在AlGaN层中不产生裂纹。 因此,本发明提供一种半导体器件,尽管Al摩尔分数高,实际上其表面电阻几乎没有随时间变化。