Abstract: A fluorescent display device including a planar cathode is provided which is capable of carrying out setting of an interval between a cathode and an anode and alignment therebetween with high precision. A cathode substrate having an FEC formed thereon is mounted through a lead frame on support members. Lead wires of the lead frame are abutted against bumps on the cathode substrate. An anode substrate having a holding frame attached thereto is positioned with respect to the cathode substrate and the holding frame and lead frame are fixed to each other. Both substrates thus temporarily fixed to each other are combined with a casing while keeping the cathode substrate facing down. Then, the anode substrate and casing are sealedly connected to each other.

Abstract: The present invention provides a nitrogen-containing cyclic compound represented by the formula (1): ##STR1## wherein R.sup.1 represents an alkyl group; R represents a hydrogen atom or an alkyl group; X represents an oxygen or sulfur atom or NR.sup.3 ; Q.sup.1 represents a hydrogen atom, or an alkyl, cycloalkyl, alkenyl or alkynyl group or a phenyl, naphthyl or heterocyclic group etc.; Q.sup.2 represents an alkyl, cycloalkyl or alkenyl group, or a phenyl or thienyl group etc.; A.sup.1 represents a carbon or nitrogen atom; A.sup.2 represents CR.sup.2 or NR.sup.2, or an oxygen or sulfur atom, or SO or SO.sub.2 ; A.sup.3 represents a single bond, or an oxygen or sulfur atom, or CR.sup.5 or NR.sup.5) and a herbicide comprising the same, which herbicide exhibits very high herbicidal activity at very low application rate and has selectivity against crops.

Abstract: The present invention provides a nitrogen-containing cyclic compound represented by the formula (1): ##STR1## (wherein R.sup.1 represents an alkyl group; R represents a hydrogen atom or an alkyl group; X represents an oxygen or sulfur atom or NR.sup.3 ; Q.sup.1 represents a hydrogen atom, or an alkyl, cycloalkyl, alkenyl or alkynyl group, or a phenyl, naphthyl or heterocyclic group etc.; Q.sup.2 represents an alkyl, cycloalkyl or alkenyl group, or a phenyl or thienyl group etc.; A.sup.1 represents a carbon or nitrogen atom; A.sup.2 represents CR.sup.2 or NR.sup.2, or an oxygen or sulfur atom, or SO or SO.sub.2 ; A.sup.3 represents a single bond, or an oxygen or sulfur atom, or CR.sup.5 or NR.sup.5) and a herbicide comprising the same , which herbicide exhibits very high herbicidal activity at very low application rate and has selectivity against crops.

Abstract: A field emission element features an emitter which has rectangular projections at its distal end capable of readily controlling the interval between electrodes in increments as small as sub-microns, in order to reduce the voltage at which the device starts field emission at the required level and to improve emission uniformity. An emitter (2,20), a collector (3,21) and a gate (5,22) are arranged on a substrate (1), which is formed with a recess (4) in proximity to the electrodes (2,3,20,21) other than the gate (5). The gate (5) is provided in the recess (4).

Abstract: Disclosed are a herbicide and a plant growth regulator comprising a 2-arylaminopyrimidinone derivative represented by the formula (1): ##STR1## (wherein Q represents various kinds of aromatic ring or heterocyclic ring).This compound can be used safely to main crops and shows high herbicidal effect to many weeds with a low dosage, and also shows plant growth regulating effect.

Abstract: A fluorescent display device capable of realizing mounting of a semiconductor element on a substrate while ensuring an increase in moisture resistance, a decrease in contact resistance at connection between the semiconductor element and a wiring conductor and increased reliability. A semiconductor element is mounted on an extension of a substrate and received in a mounting chamber formed by cooperation of a sealing material, a face plate and the substrate. The semiconductor element is downwardly pressed against the substrate by the face plate, resulting in the semiconductor element being electrically connected to a wiring conductor. The sealing material is made of an inorganic material such as indium-tin alloy or the like which has an operating temperature lower than a sealing medium.

Abstract: A field emission element in which the emitter has rectangular projections at its distal end capable of readily controlling the interval between electrodes in increments as small as sub-microns, in order to reduce the voltage at which the device starts field emission at the required level and to improve emission uniformity. An emitter (2,20), a collector (3,21) and a gate (5,22) are arranged on a substrate (1), which is formed with a recess (4) in proximity to the electrodes (2,3, 20,21) other than the gate (5). The gate (5) is provided in the recess (4).

Abstract: An image display device capable of minutely setting the interval between an emitter (6) and a gate (5) with high accuracy and of being driven at a significantly reduced drive voltage with good emission uniformity. Each emitter (6) is provided in a recess in a substrate (2), so that the interval between the emitter (6) and a gate (5) is determined depending upon the thickness of the emitter (6). Thus, the interval can be readily controlled by adjusting or varying the period of time during which the film for the emitter (6) is formed, resulting in a micro-interval of the order of sub-microns between the two components being possible with high accuracy.

Abstract: An electron emitting element capable of preventing pollution of the emitter due to absorption of gas thereon, to thereby ensure stable emission of electrons over a long period of time even in a low vacuum atmosphere. The electron emitting element is constructed so as to permit a part of electrons emitted from one of emitters to impinge on the other of the emitters being ready for emission to clean it.