摘要:
A low-cost package for semiconductors that is superior in heat dissipation and capable of preventing the cracking of semiconductor elements at the time of mounting, and a semiconductor module employing the package. The package for semiconductors comprises a CVD diamond substrate 22 made of an independent diamond lamina, and a highly heat-conductive metallic member 21 bonded with the substrate. Semiconductor elements such as MMICs are mounted on an area 25 for mounting semiconductor elements. The CVD diamond substrate 22 may be replaced by a composite in which a CVD diamond layer is formed on a base material having thermal conductivity of 100 W/m·K or more. The provision of protuberances 26 of the metallic member 21 around the CVD diamond substrate 22 prevents the leakage of microwaves and millimeter waves.
摘要:
A window material, which has a high thermal conductivity material layer having a thermal conductivity of at least 10 W/cm.multidot.K and which has a cooling medium flow path on or in the high thermal conductivity material layer, has a high heat-dissipating property and a high transmittance.
摘要:
In the digital PID (P:proportional, I:integral, D:derivative) control apparatus of the present invention, in which a deviation is obtained from a controlling amount of an object to be controlled, and a target value, a velocity type PI control operation is carried out on the deviation, a velocity type D control operation is carried out on the deviation or the controlling amount, these velocity type control operation outputs are synthesized, and then converted into a position type manipulation signal, and this signal is supplied to the object to be controlled, the derivation processing unit includes the judgment unit for judging whether K=2.multidot..DELTA.t/(.DELTA.t+2.eta..multidot.TD).ltoreq.1, or K>1 by using a control operation period .DELTA.t, a derivative time TD and a derivative gain 1/.eta., and the operation unit which carries out a lagged derivative operation by a bilinear transfer method when K.ltoreq.1, or carries out an exact derivative operation when K>1.
摘要翻译:在本发明的数字PID(P:比例,I:积分,D:微分)控制装置中,从被控制物的控制量和目标值获得偏差,速度型PI 对偏差进行控制操作,对偏差或控制量执行速度类型D控制操作,合成这些速度型控制操作输出,然后转换为位置型操作信号,并且提供该信号 导出处理单元包括用于通过使用控制操作期间DELTA t来判断K = 2×DELTA t /(DELTA t + 2 eta x TD)= 1或K> 1的判断单元, 衍生时间TD和微分增益1 / eta,以及当K <1时通过双线性传递方法执行滞后导数运算的操作单元,或当K> 1时执行精确导数运算。
摘要:
The present invention relates to a substrate for a semiconductor device having a diamond base material and a multisublayer wiring layer on the diamond base material, wherein the diamond base material is a diamond layer prepared by vapor phase deposition. The multisublayer wiring layer has at least one insulating sublayer having a relative dielectric constant of not larger than 5 or at least 12 and at least one metal wiring sublayer. The present invention is particularly useful as a substrate for a high performance, high-speed operation semiconductor device.
摘要:
Diamond particles are dispersed in a metal and the metal matrix is molten and recrystallized so that the diamond particles are aligned to the same crystal orientation to form a substrate equivalent to a diamond single crystal substrate and then the diamond is grown by a vapor phase synthesis on the substrate. The diamond single crystal having the homogeneity and good quality can be formed and the diamond single crystal having a large area can be easily and economically obtained.
摘要:
A polyacetal resin composition having a volume resistivity lower than 10.sup.14 [.OMEGA..multidot.cm], which comprises (A) 100 parts by weight of a polyacetal resin and (B) 1 to 100 parts by weight of a polyether ester block copolymer which is derived from (a) a dicarboxylic acid component composed mainly of terephthalic acid, (b) a glycol component composed mainly of 1,4-butanediol and (c) a poly(ethylene oxide)glycol having a number average molecular weight of 500 to 20,000 and has a poly(ethylene oxide) dicarboxylate unit content of 20 to 95% by weight, has excellent antistatic characteristics and mechanical characteristics, and especially a high impact resistance.
摘要:
A method of manufacturing a semiconductor wafer of the present invention includes the steps of: obtaining a composite base by forming a base surface flattening layer having a surface RMS roughness of not more than 1.0 nm on a base; obtaining a composite substrate by attaching a semiconductor crystal layer to a side of the composite base where the base surface flattening layer is located; growing at least one semiconductor layer on the semiconductor crystal layer of the composite substrate; and obtaining the semiconductor wafer including the semiconductor crystal layer and the semiconductor layer by removing the base surface flattening layer by wet etching and thereby separating the semiconductor crystal layer from the base. Thus, a method of manufacturing a semiconductor wafer capable of efficiently manufacturing the semiconductor wafer regardless of the type of a base, and a composite base and a composite substrate suitably used in that manufacturing method are provided to efficiently manufacture a semiconductor device.
摘要:
A protective-film-attached composite substrate includes a support substrate, an oxide film disposed on the support substrate, a semiconductor layer disposed on the oxide film, and a protective film protecting the oxide film by covering a portion that is a part of the oxide film and covered with none of the support substrate and the semiconductor layer. A method of manufacturing a semiconductor device includes the steps of: preparing the protective-film-attached composite substrate; and epitaxially growing, on the semiconductor layer of the protective-film-attached composite substrate, at least one functional semiconductor layer causing an essential function of a semiconductor device to be performed. Thus, there are provided a protective-film-attached composite substrate having a large effective region where a high-quality functional semiconductor layer can be epitaxially grown, and a method of manufacturing a semiconductor device in which the protective-film-attached composite substrate is used.
摘要:
A group III nitride composite substrate includes a support substrate, an oxide film formed on the support substrate, and a group III nitride layer formed on the oxide film. The oxide film may be a film selected from the group consisting of a TiO2 film and a SrTiO3 film, and an impurity may be added to the oxide film. Accordingly, the group III nitride composite substrate having a high bonding strength between the support substrate and the group III nitride layer is provided.
摘要:
An object is to provide an electron emitting cathode achieving high luminance, low energy dispersion, and long life. It is therefore an object to provide a diamond electron emitting cathode graspable on a sufficiently stable basis, sharpened at the tip, and improved in electric field intensity. A diamond electron emitting cathode 110 according to the present invention is partitioned into at least three regions, i.e., a front end region 203 intended for electron emission at a tip of columnar shape, a rear end region 201 intended for grasping opposite in the longitudinal direction, and a thinned intermediate region 202, a cross-sectional area of the rear end region is not less than 0.2 mm2, the tip of the front end region is sharpened, and a maximum cross-sectional area of the thinned intermediate region is not more than 0.1 mm2.