Mitsubishi Denki Kabushiki Kaisha

Hiroshi Takada

Hiroshi Ito

Masaaki Mihara

Hitoshi Yamazaki

Hiroshi Onoda

Jun Imai

Sadaharu Doi

Takahiro Onakado

Kiyoshi Hayashi

An aluminum wire is connected to a P-type layer of a polydiode element through a resistive element consisting of a barrier metal film and a tungsten plug. Another aluminum wire is connected to an N-type layer of the polydiode element through another resistive element consisting of another barrier metal film and another tungsten plug. Thus, a semiconductor device including a polydiode element which is resistant to surge or contamination is provided.

Method of making a semiconductor device having a polydiode element

Semiconductor device comprising a polydiode element

To a column line to which a selected memory cell is connected, a write bias voltage is supplied through a selection gate transistor having different channel conductivity type than the memory cell transistor. Current drivability of the selection gate transistor is adapted to be larger than a leak current of the memory cell and to supply a current smaller than the channel current when a channel is formed in one aspect. When a verifying voltage is applied to the selected word line, a large channel current flows when a channel is formed, potential of a subbit line is changed accordingly, and programming is suppressed. In another aspect, the selection gate transistor serves as a constant current source to make the programming speed of the memory cells constant. Thus distribution of threshold values after programming can be made narrow.

Non-volatile semiconductor memory device capable of high speed

A phosphor suspension is prepared by adding to an aqueous solution of a polyethylene oxide, a phosphor, a phosphate or a borate of an alkali metal and a phosphor bonding agent. After having passed through a filter, the phosphor suspension flows down on the inner surface of a glass bulb of a fluorescent lamp to form a phosphor layer on it. The coated bulb is heated to a temperature which is not higher than its softening temperature while it is transported along two opposite guide rails by two endless conveyors by having both end portions supported by associated guide tips on the conveyors projecting above the guide rails.

Apparatus for manufacturing fluorescent lamps

A phosphor suspension is prepared by adding to an aqueous solution of a polyethylene oxide, a phosphor, a phosphate or a borate of an alkali metal and a phosphor bonding agent. After having passed through a filter, the phosphor suspension flows down on the inner surface of a glass bulb of a fluorescent lamp to form a phosphor layer thereon. The coated bulb is heated to a temperature which is not higher than its softening temperature while it is transported along two opposite guide rails by two endless conveyors by having both end portions supported by associated guide tips on the conveyors projecting above the guide rails.

Growing community of inventors

Hyogo, Japan

Hiroshi Takada