摘要:
A metal matrix composite casting comprises a metal matrix composite and a processed member inserted in the metal matrix composite by enveloped casting. By the processed member which is easier to process than the metal matrix composite, a processed portion of a predetermined shape can be formed in the metal matrix composite. That is, by a simple processing such that the processed member is removed from the metal matrix composite or the processed portion is formed in the processed member itself, the processed portion having a desired shape can be easily formed in the metal matrix composite.
摘要:
A concave channel type DMOS structure having an improved gate-to-source breakdown voltage are disclosed. By establishing a curvature at a corner portion of a lattice-like pattern in a groove portion for forming the concave channel structure, the shape of the tip of a three-dimensionally projecting portion of a semiconductor region determined by a plane angle of the corner portion in the lattice-like pattern and an inclination of the groove portion is rounded. That is, a three-dimensionally sharpened corner portion in the concave channel structure is rounded, and thereby electric field concentration at the corner portion is suppressed.
摘要:
A power MOSFET having a groove for forming a channel improved for shortening the switching time and increasing the dielectric breakdown strength of the gate oxide film is disclosed. The power MOSFET includes a concave structure in which a gate oxide film at a groove bottom is thickened. Namely, since the gate oxide film between a gate electrode and a first conductivity type semiconductor layer is thick, the capacitance of the oxide film therebetween is reduced. Therefore, the input and output capacitance of the gate oxide film can be reduced, and switching loss can be also reduced since the switching time can be shortened. Further, greater dielectric breakdown strength of the gate oxide film can be obtained as a result of the thickened gate oxide film at the groove bottom.
摘要:
In an image processing apparatus for previewing a color image, by using a color output device for forming a preview image, processing is decentralized, the load on a host computer is reduced, and a preview-processing program can be easily formed. The apparatus includes a communication device, e.g., a bidirectional interface, for communicating with a host computer, an output device for outputting image information for image formation to an image forming device for forming an image on a recording material based on input color-image information from the host computer, and a color conversion device for previewing an image which generates color-preview-image information for correcting the image formed by the image forming device on a color monitor. The color-preview-image information is transmitted to the host computer by the communication device.
摘要:
Vibration occurring at an arm part of an industrial robot when the arm part is moved is controlled by combining vibrations occurring at two time points for mutual interference. In each of acceleration and slowdown periods, the time difference of rise and fall time points t.sub.1, t.sub.4 and t.sub.2, t.sub.3 of a differential value of an acceleration with respect to time is set to be an integral number times the natural vibration period of the system so that the vibrations occurring at the rise and fall time points interfere with each other to cancel one another. Also, the vibration occurring in the acceleration period and the vibration occurring in the slowdown period can cancel each other.
摘要:
A p type pad well layer is formed at the surface of an n.sup.- type drain layer under a gate bonding pad and the surface thereof is provided with a p.sup.++ type pad layer to be provided with lower resistivity. The p.sup.++ type pad layer is connected with a source electrode through a contact hole. Since the gate electrode supplying each cell with gate potential is of a pattern having extensions in a comb-teeth form arranged along the boundary between the pad region and the cell region, there is present substantially no gate electrode under the pad. Hence, introduction of impurities into the entire surface of the well layer under the pad region can be performed simultaneously with formation of p.sup.++ type contact layers after the formation of the gate electrode, and accordingly, the low resistance p.sup.++ type pad layer can be easily formed. The p.sup.++ type pad layer serves as a low resistance path for allowing the holes flowing into the region under the pad region of the insulated gate bipolar transistor to escape to the source electrode, whereby occurrence of the latch up and increase in the turn-off time due to the minority carriers concentrating into the border portion cell located adjacent to the pad region can be prevented.
摘要翻译:p型衬垫阱层形成在栅极焊盘下方的n型漏极层的表面处,并且其表面设置有具有较低电阻率的p ++型焊盘层。 p ++型垫层通过接触孔与源电极连接。 由于向每个单元提供栅极电位的栅极电极具有沿着焊盘区域和单元区域之间的边界布置的梳齿形式的延伸的图案,所以在焊盘下面基本上不存在栅电极。 因此,在形成栅极电极之后,可以在形成p ++型接触层的同时进行在焊盘区域下方的阱层的整个表面的杂质的引入,因此能够容易地形成低电阻p ++型焊盘层 。 p ++型衬垫层用作低电阻路径,用于允许流入绝缘栅双极晶体管的焊盘区域下方的空穴逸出到源电极,由此发生闭锁并增加关断时间 由于可以防止集中在位于焊盘区域附近的边界部分单元的少数载流子。
摘要:
An OADM in a wavelength division multiplexing transmission system includes a wavelength selection switch that selects a predetermined wavelength from a multiple optical signal obtained by multiplexing a phase modulated signal and an intensity modulated signal and outputs the selected wavelength signal to a predetermined output port. The wavelength selection switch has a different delay for each wavelength of the multiple optical signal. For example, the wavelength selection switch includes a mirror array. Optical paths from the surfaces of mirrors arranged on the mirror array to the diffraction grating are different in the case of adjacent mirrors.
摘要:
There is provided an optical semiconductor device having a first optical semiconductor element including an InP substrate, a lower cladding layer formed on the InP substrate, a lower optical guide layer which is formed on the lower cladding layer and is composed of AlGaInAs, an active layer which is formed on the lower optical guide layer and has a multiple quantum well structure where a well layer and a barrier layer that is formed of AlGaInAs are alternately stacked, an upper optical guide layer which is formed on the active layer and is composed of InGaAsP, and an upper cladding layer formed on the upper optical guide layer.
摘要:
It is necessary to avoid performing printing which brings about a poor printing result due to a mismatch between a medium fed by a printer and a set medium. For arbitrary paper, a paper type determining process unit 612 determines according to the information plural times detected with different timing during the process on the print data whether or not a mismatch occurred between the type of paper set on a printer and paper set by a print setting process unit 611, and the generation and output of print data by a print data generating process unit 618 is correctly controlled.
摘要:
This disclosure provides a method of adjusting capacities of combustion chambers of a multi-cylinder engine having a cylinder head with recessed parts that partially form the combustion chambers and a mating surface for mating with a cylinder block, which includes casting a cylinder head material having flat reference surfaces on top of the recessed parts of the cylinder head, machining the cylinder head material to form the mating surface, measuring distances in a height direction from the mating surface to the reference surfaces, respectively, and adjusting machining margins of machining portions of the reference surfaces of the recessed parts based on the measured height direction distances.