Abstract: Disclosed are terbium-activated oxide phosphors having incorporated, at least one of ytterbium, thulium, samarium and europium. Incorporation of the element (s) has made it possible to produce phosphors exhibiting high brightness and suffering little brightness deterioration under high-density electron bombardment.

Abstract: When accessing a data bit memorized in a memory cell of a memory cell array incorporated in a dynamic random access memory device, a word line driving unit boosts one of the word lines coupled to the accessed memory cell over a power voltage level for allowing electric charges stored in the memory cell to be read out from the bit line pair, lowers the selected word line, and, then, boosts again after difference amplification so that the extremely thin gate oxide of the switching transistor forming a part of the accessed memory cell is hardly damaged by the extremely high voltage level.

Abstract: There are disclosed a europium and terbium-coactivated phosphor having chemical composition formula(M.sub.l-x-y Eu.sub.x Tb.sub.y).sub.n Dwherein M represent Y or Lu, D represents (Al.sub.l-z Ga.sub.z).sub.5 O.sub.12 in which z is defined by 0.ltoreq.z.ltoreq.1, or O.sub.2 S, x is defined by 0.0003.ltoreq.x.ltoreq.0.001, y is defined by 0.0003.ltoreq.y.ltoreq.0.002 and n is 2 or 3, and wherein when D is (Al.sub.l-z Ga.sub.z).sub.5 O.sub.12, M is Y, n is 3 and y is defined by 0.001.ltoreq.y.ltoreq.0.02, or when D is O.sub.2 S, n is 2, y is defined by 0.0003.ltoreq.y.ltoreq.0.005; a cathode ray tube for color copy or color print coated with said europium and terbium-coactivated phosphor; and a copy (printing) unit using said cathode tube.

Abstract: A cathode-ray tube having a face plate which includes a phosphor layer provided at the inner surface side of a glass plate and an optical interference filter provided between the phosphor layer and the inner surface of the plate. The optical interference filter is constituted by high- and low-refractive index layers. The outermost layer of the optical interference filter in contact with the phosphor layer is an Al.sub.2 O.sub.3 layer or a ZrO.sub.2 layer having a physical thickness of 10 nm or more. The high-refractive index layer of the optical interference filter preferably consists of TiO.sub.2, and its low-refractive index layer preferably consists of Al.sub.2 O.sub.3.

Abstract: Disclosed are terbium-activated oxide phosphors having incorporated, at least one of ytterbium, thulium, samarium and europium. Incorporation of the element (s) has made it possible to produce phosphors exhibiting high brightness and suffering little brightness deterioration under high-density electron bombardment.

Abstract: This invention relates to a phosphor prepared by mixing a green emitting phosphor InBO.sub.3 :Tb having an excellent color tone with other green emitting phosphors having a short decay time such as Y.sub.3 Al.sub.5-m Ga.sub.m O.sub.12 :Tb in amounts such that the "decay time to 10% of peak brightness" measured by a raster spot method is below 10 ms. The phosphor screen of a projection cathode-ray tube is formed by use of this phosphor. The projection cathode-ray tube thus produced has an excellent color tone and a short decay time.

Abstract: A memory circuit provided with an improved word line noise preventing circuit is disclosed.The memory circuit is one of the type having a pair of digit lines, a plurality of word lines intersecting with the digit lines, a plurality of memory cells, a sense amplifier coupled to the pair of digit lines and a plurality of noise preventing circuits provided for the word lines. The memory is featured in that the noise preventing circuits are disenabled during the period when the sense amplifier amplifies the voltage difference between the pair of digit lines.

Abstract: Disclosed is a cathode ray tube including a white emitting phosphor screen comprising, in mixing, a blue emitting phosphor having the composition expressed by a composition formula (M.sub.1-x Tb.sub.x).sub.2 O.sub.2 S (wherein M is Y and/or Gd, and the range of x is 0<x.ltoreq.0.01) and at least one other phosphor which does not contain Cd. This cathode ray tube has less luminance deterioration and burning of the phosphor screen, and it causes no pollution.

Abstract: A phosphor screen good in quality without greatly lowering brightness can be produced on a cathode-ray tube faceplate by the settling process wherein there is used a suspension of phosphor particles which are susceptible to hydrolysis or dissolution prepared by using an alkaline aqueous solution having a pH of 10 to 13 and if necessary with a small amount of water glass, or the above-mentioned phosphor suspension is poured into a cushion solution having a pH of 10 to 13, said cushion solution being able to contain a small amount of water glass.

Abstract: A magnetic bubble memory element comprising a magnetic bubble memory unit and a separating region portion, which is prepared by the steps of forming a plurality of island shaped magnetic bubble memory units with separating regions intervening therebetween on a single crystalline substrate and performing the cutting process along the separating regions. In a preferably prepared memory element, the magnetic bubble memory unit and the separating region portion own in common a single crystalline magnetic thin layer which is formed on the substrate and the memory unit further comprises a hard bubble suppression film deposited on the magnetic thin layer, a conductor pattern layer and a magnetic film pattern layer both of which are deposited in that order on the suppression film so as to be insulated therefrom as well as insulated from each other.