摘要:
As the semiconductor chip is large-sized, highly integrated and speeded up, it becomes difficult to pack the semiconductor chip together with leads in a package. In view of this difficulty, there has been adopted the package structure called the "Lead-On-Chip" or "Chip-On-Lead" structure in which the semiconductor and the leads are stacked and packed. In the package of this structure, according to the present invention, the gap between the leading end portions of the inner leads and the semiconductor chip is made wider than that between the inner lead portions except the leading end portions and the semiconductor chip thereby to reduce the stray capacity, to improve the signal transmission rate and to reduce the electrical noises.
摘要:
A standing-wave accelerating structure for accelerating charged particles wherein a converging force and a diverging force of an electric field to an electron beam are checked to improve the transmittivity of the electron beam through the accelerating structure and production of X-ray leakage is eliminated or minimized. The accelerating structure comprises a buncher section including at least one cavity for mainly bunching charged particles, and a regular section including at least one cavity. The diameter of a bore in the buncher section is smaller than the diameter of another bore in the regular section. A shorting bar for stopping propagation of microwaves is inserted in at least one of the cavities, and a means for accelerating the charged particles and for converging a beam is provided forwardly or rearwardly of the cavity in which the shorting bar is inserted.
摘要:
Doped thin films of GaAs are chemically vapor deposited by depositing a high resistant buffer layer of GaAs on a GaAs substrate by gaseous reaction of a mixture of arsine gas and trimethylgallium in the gas phase over the substrate while the temperature of the substrate is maintained within the range of 600.degree.-700.degree. C., stopping the supply of trimethylgallium to the gas mixture undergoing reaction and increasing the temperature of the substrate to within the range of 700.degree.-800.degree. C., and then resuming the supply of trimethylgallium to and supplying hydrogen sulfide to the gas phase over the substrate at the stated temperature, thereby depositing a doped GaAs layer over the buffer layer on the substrate having a distribution of carrier density of less than 5%.
摘要:
Ink in an ink ribbon contains per 100 parts by weight of ink, 0.1-10 parts by weight of an adsorption-type corrosion suppressor. The adsorption-type corrosion suppressor may be one or more of, the following compounds: amines of the formula R--NH.sub.2, RR'--NH, RR'R"--N (where R, R' and RR" are alkyl groups), thiourea and its derivatives, benzotriazole and its derivatives, thiazole, thioamides and thiosemicarbazide. In another aspect of the invention, the ink contains an organic pigment as coloring material, said ink containing 5.0-10.0 parts by weight of graphite per 100 parts by weight of ink.
摘要:
A method of automatically inserting a printing paper in a hopper of an automatic paper feeder or a manual insertion printing paper inserted from a manual paper input slot. Upon receiving an instruction to insert a printing paper by a printer, a platen is first rotated. Thereupon, provided the presence of the printing paper is detected by a sensor even with the platen being rotated by a prescribed amount, a paper feed motor of the automatic paper feeder is rotated for obtaining a printing paper from the hopper. While, provided the presence of a printing paper is detected before the platen is rotated by the prescribed amount, the paper feed motor is not rotated, it being assumed that the manual insertion of a printing paper has been already performed. After detected the presence of the printing paper, the platen is rotated by a prescribed amount to cause the printing paper to be moved to a position where a first line of the printing paper faces the face of the printing head.
摘要:
A ribbon protector is used for protecting paper from contamination by an ink ribbon in a printer, where the protector is inserted between paper located between a platen and a printing head. The printing head facing the platen performs spacing movement for printing. Two connected plate-like elements are provided with through openings for passage of the pin of the printing head. Mutually engageable electroconductive elements are provided on the inner walls of the two plate-like elements, at least in the area where they are compressed by the tip of the printing head, and spacers which are made from resilient materials are located between the two plate-like elements.
摘要:
A carriage mechanism of a printer includes a carriage frame, a printed circuit board mounted on the carriage frame and having an exposed wiring portion and a plurality portion of guide holes, and a cable having at one end thereof an exposed wiring portion to be electrically connected to the exposed wiring portion of the printed circuit board. An inked ribbon feed mechanism has guide projections to be inserted into the guide holes and a plurality of elastic hooks for fastening to the carriage frame. A cable fixing mechanism includes a flexible film member to be superimposed over the end of the flexible cable and fixed thereto. One end of the flexible film member is shaped as the end of the flexible cable and the other end of the flexible film member is progressively narrower and projects toward a folded portion of the flexible cable.
摘要:
A flexible cable has a grounding pattern or patterns provided therein. Thereby, when an object having static electricity of high voltage is caused to approach the flexible cable, dielectric breakdown of a base and cover of a high polymer material of the cable, to a conducting portion of the cable which is not exposed at the interior of the flexible cable is prevented, and damage to an electronic circuit connected with the not exposed portion, due to electric discharge, can be prevented by causing the static electricity to be discharged to the exposed grounding pattern.