Abstract: A semiconductor device comprises a semiconductor region including silicon, and an insulating film including silicon, oxygen, nitrogen, and helium, the dielectric film provided on the semiconductor region, and the dielectric film having a concentration distribution with respect to a film thickness direction, the concentration distribution having a maximal value of concentration of the helium in a surface portion on the semiconductor region side and a maximal value of concentration of the nitrogen in a surface portion on a side opposite to the semiconductor region.

Abstract: An aspect of the present invention includes; a silicon oxynitride film having an oxynitride layer which is formed on at least the surface of a silicon substrate and in which nitrogen atoms are in a three-coordinate bond state, and a silicon oxide layer which is formed between said oxynitride layer and said silicon substrate.

Abstract: A semiconductor device includes a Si crystal having a crystal surface in the vicinity of a (111) surface, and an insulation film formed on said crystal surface, at least a part of said insulation film comprising a Si oxide film containing Kr or a Si nitride film containing Ar or Kr.

Abstract: A grounding connector for a shielded cable comprising a backshell, a cap nut, and a ring therebetween, wherein the ring is of a novel design having a single slit and at least three protrusions extending axially toward the cap nut, whereby previously used tube, stepped ring, and spring washers are all eliminated. The invention is thus substantially simplified from the prior art, has enhanced EMI prevention properties, greatly reduced costs, and greatly increased reliability, and improved performance.

Abstract: A connector backshell structure wherein a wedge-like ring having at least one slit extending along the entire longitudinal length thereof is used for holding a cable shield in tight contact with the tapered inner surface of the connector backshell, and a spring washer is used for elastically urging the ring toward the tapered surface with a cap nut pressing and fixing the spring washer to the open end of the backshell, whereby the contact between the cable shield and backshell is reliably maintained.

Abstract: A key telephone system includes a plurality of key telephone sets having speakers and tone signal generators and communicating with each other through extension links. The key telephone system further includes a first memory, a second memory, a main CPU, a sub CPU, an MF signal generator, and a speech path switch. The first memory stores availability of the extension links. The main CPU discriminates whether all extension links are available according to the storage contents of the first memory in an extension call mode. The MF signal generator signals to a calling key telephone set that all the extension links are busy when the main CPU discriminates that all the extension links are busy. A second memory stores information on each calling and called key telephone set if the extension call is in a state where the MF signal generator signals that all the extension links are busy.