摘要:
A semiconductor device which can make the generation of gate parasitic oscillations more difficult than a semiconductor device of the related art is provided. The semiconductor device includes: a drift layer which is constituted of a reference concentration layer and a low concentration layer; a gate electrode structure; a pair of source regions, a pair of base regions, and depletion-layer extension regions which are formed in the reference concentration layer below the base regions, wherein the depletion-layer extension regions are formed such that a lower surface of the depletion-layer extension region is deeper than a boundary between the low concentration layer and the reference concentration layer and projects into the low concentration layers, and a dVDS/dt-decreasing diffusion layer which contains an n-type impurity at a concentration higher than the concentration of the impurity which the reference concentration layer contains and decreases dVDS/dt when the semiconductor device is turned off is formed on a surface of the reference concentration layer.
摘要:
Method for forming solder bumps on a first member such as a semiconductor chip having electrode pads formed thereon. A flat plate having holes is prepared and the holes are filled with solder paste by squeezing. The flat plate is then overlapped with the first member with the flat plate above the first plate. The flat plate and the first member are heated to a temperature higher than the melting point of the solder alloy in the solder paste. Therefore, solder bumps having identical sizes and uniform structures can be obtained.
摘要:
The invention has as an object to provide a reliable, failure-free tool holding apparatus which allows digitization of a tool holding apparatus having a tool moving function, is free from various problems encountered upon digitization, and does not cause an erroneous operation upon scattering and attachment of chips or cutting oil. In order to achieve this object, a scale member and a moving amount detecting means are arranged to oppose each other. The scale member is arranged at the side of a slide movable in a predetermined direction, and is moved following the movement of the slide. The moving amount detecting means is arranged at the side of the main body and supplies a predetermined number of oscillation pulses to a display in accordance with the moving amount of the scale member. The scale member is enclosed with stretchable members such as bellows members, and is moved in the enclosed, sealed space.