Abstract: A slide-type solvent transfer unit is used, and a plurality of nozzles at a head part which suck and hold components are moved down simultaneously to transfer flux to electronic components. In comparison with an electronic component mounting method including a transfer operation whereby nozzles are lowered one by one by a conventional electronic component mounting apparatus equipped with a rotary type solvent transfer unit, the time required for moving the nozzles up and down is shortened and a total cycle time is reduced, so that production efficiency is improved.

Abstract: A solvent transfer unit is made a slide type and a plurality of nozzles at a head part which suck and hold components are moved down simultaneously to transfer the flux to electronic components. In comparison with an electronic component mounting method including a transfer operation whereby nozzles are lowered one by one by a conventional electronic component mounting apparatus equipped with a rotary type solvent transfer unit, a time for moving the nozzles up, down is shortened and a total cycle time is reduced, so that production efficiency is improved.

Abstract: A suction section provided with a plurality of suction nozzles is used. The suction section is moved to a parts supply section in which a plurality of parts are stored so that they can be sucked at the same time, the parts stored in the parts supply section are sucked onto the plurality of suction nozzles at the same time, and the sucked parts are mounted on a board. At this time, all suction nozzles each involving a shift amount within an allowable range in which simultaneous suction is possible are set in one group and suction nozzles each involving a shift amount outside the allowable range in which simultaneous suction is possible are set in a different group and the parts are sucked at the same time for each of the groups.

Abstract: An offset measuring board is formed of a rectangular metal plate which can be positioned to a component mounting position by a positioning device and which has at least in proximity to one corner portion thereof a recognition through hole, as a recognition mark, having a black bottom face within a recessed portion.

Abstract: In a component mounting apparatus, a component (8) is held, positioned and mounted at a predetermined position of a member (4) to be mounted. After the component (8) is mounted to the member (4), a component holding member (5) is raised by a distance corresponding approximately to a push-in amount by which the component holding member (5) has been moved down to mount the component, then stopped to retain the component (8), is kept in this state while retaining the component for a fixed time, and is raised again to a predetermined position.

Abstract: A magnetic recording medium having pits corresponding to servo signals and grooves extending along recording tracks, in which a magnetic head undergoes only little variations in its floating amount during recording/reproduction. The ratio Lw/Gw, where Lw is the width of a land 4 as a protuberant portion between neighboring grooves 3 and Gw is the width of the groove 3, is set so as to be not less than 2.0.

Abstract: A magnetic disk yields an excellent off-track characteristics and a high coercive force if a track density is increased. The magnetic disk includes a non-magnetic plate on which data such as a servo signal is formed by convexo-concave patterns and an metallic magnetic film formed on the non-magnetic plate. The metallic magnetic film has a thickness of 50 nm or lower. Between the non-magnetic plate and the metallic magnetic film is formed a primary coat composed of a first and a second coats. The first coat is made of any one of C, Si and Ge and the second coat is made of Cr as a main component. The first coat has a thickness of 2 to 80 nm. The second coat has a thickness of 5 to 108 nm.

Abstract: In a magnetic recording medium according to the present invention, a magnetic layer consisting of a metal magnetic material is formed on the upper surface of a non-magnetic support member, a protective layer is formed on the magnetic layer, and a back-coat layer is formed on the rear surface of the non-magnetic support member. In the present invention, in particular, the protective layer is formed by a thin film containing carbon as a main component and 5 to 20 atom % of hydrogen, and the back-coat layer is formed by a thin film containing carbon as a main component and 5 to 20 atom % of hydrogen, thereby making it possible to obtain a magnetic recording medium having excellent sliding characteristics and excellent durability.

Abstract: An atmospheric pressure glow discharge plasma treatment method, in which a gaseous mixture comprising argon, argon and helium, or argon and hydrogen, mixed with water vapor or water vapor and ketones at room temperature or a specified temperature, is introduced into a plasma reactor having a dielectric-coated electrode comprising a solid dielectric disposed on the surface of at least one of opposing electrodes, and a high-frequency voltage is applied under atmospheric pressure to generate atmospheric pressure glow discharge and excite a plasma, thereby making surface treatment of plastics or fibers disposed between the electrodes.

Abstract: A method for treating ozone layer depleting substances, in which a gaseous composition comprising helium or argon or a mixture thereof, or a gaseous mixture of argon and acetone, is introduced into a plasma reactor having a dielectric-coated electrode comprising a solid dielectric disposed on the surface of at least one of opposing electrodes, an atmospheric pressure glow discharge is generated in the gaseous atmosphere, gaseous ozone layer depleting substances are introduced into the glow discharge to decompose the substances, and resulting decomposition products are absorbed in water.

Abstract: The coefficient k.sub.1 of linear expansion in a temperature range from 50.degree. to 300.degree. C. of a non-magnetic support member of a recording medium, before a Co-Cr alloy film is formed thereon, is less than 0 mm/mm .degree.C., and the coefficient k.sub.2 of linear expansion in a temperature range from 50.degree. to 300.degree. C. of that support member after the Co-Cr alloy film is formed is less than 0.3.times.10.sup.-5 mm/mm .degree.C. The alloy film also includes carbon in the magnetic layer, and a protective film comprised of carbon is further formed on the magnetic layer. The recording medium is particularly adapted for perpendicular magnetic recording.

Abstract: This invention provides a method for the surface treatment of a metal, which comprises the steps of: placing at least a surface to be treated of a metal to be treated between two electrodes facing each other under an atmosphere of a mixed gas consisting of an inert gas and a reactant gas; and plasma exciting said mixed gas under atmospheric pressure to effect glow discharge between said electrodes. The method of the present invention uses an apparatus simpler than that used in a conventional method and can inject into the surface layer of a metal, even those elements which have been difficult to with the conventional method, and can readily modify surface properties of a metal such as surface hardness, surface wettability, etc.

Abstract: According to this invention, there is provided an atmospheric pressure plasma surface treatment process comprising the steps of introducing a gas in a plasma reaction apparatus having a pair of dielectric-covered electrodes having opposing surfaces on at least one of which is provided with a solid dielectric; performing plasma excitation under atmospheric pressure; and surface treating an object placed between the opposing electrodes, wherein the gas introduced is a gaseous composition consisting essentially of argon, helium and/or ketone. This process makes it possible to quickly imparting hydrophilic nature to surfaces of an object made of a plastic to be treated. The hydrophilic nature given lasts long.

Abstract: Specified sulfur compounds such as N,N-diethylthiourea, N,N-dibutylthiourea, tetramethylthiuram monosulfide, tetrabutylthiuram monosulfide, tetraethylthiuram disulfide, tetrabutylthiuram disulfide are supplied as a coking inhibitor for preventing coking in equipment used in hydrocarbon treatment processes wherein a hydrocarbon is treated at a temperature of from about 250.degree. C. to 950.degree. C. to produce petroleum products, petrochemical products and/or their intermediate products.

Abstract: An electrophotographic copying machine comprises a light beam reflection device, a charge removing device, a developing device, and a control device. The light beam reflection device is operated to reflect light beams from a document image portion and a margin portion to a photoreceptor. The control device causes the charge removing device to remove unnecessary charges in order to erase a latent image corresponding to the margin portion. The developing device is operated to develop the latent image exactly corresponding to the document portion. The control device may comprise a timer or lead switches.

Abstract: A polyolefin resin composition consisting essentially of at least one homopolymer or copolymer of an aliphatic monoolefin and 0.05 to 2% by weight, based on the weight of the composition, of a dibenzylidene sorbitol derivative of the following formula ##STR1## wherein R and R' are different from each other and each represents a member selected from the class consisting of a hydrogen atom, a chlorine atom, alkyl groups having 1 to 3 carbon atoms and alkoxy groups having a C.sub.1 -C.sub.3 alkyl moiety.

Abstract: An acrylic resin article comprising a methyl methacrylate polymer and dibenzylidene sorbitol or its derivative as essential ingredients; and a process for producing an acrylic resin article, which comprises putting a composition comprising a methyl methacrylate monomer or a mixture of a methyl methacrylate polymer and a methyl methacrylate monomer and dibenzylidene sorbitol or its derivative in a mold, and thereafter polymerizing the methyl methacrylate monomer in the composition.

Abstract: A composition consisting essentially of solid powdery dibenzylidene sorbitol and a higher fatty acid, the surface of the dibenzylidene sorbitol being coated with the higher fatty acid; and a process for producing dibenzylidene sorbitol powder having a coating of a higher fatty acid on its surface, which comprises a step of forming an aqueous emulsion of the higher fatty acid by adding an alkali to an organic solvent solution or hot molten mass of the higher fatty acid partially saponify the higher fatty acid and dispersing the resulting mixture of the higher fatty acid and its saponification product in water, a step of coating the surface of dibenzylidene sorbitol powder with the higher fatty acid by adding the dibenzylidene sorbitol to the resulting emulsion, and a step of separating the solid from the mixture, drying the solid and recovering the dried product. The transparency and rigidity of a polyolefin resin is improved by addition of aforesaid dibenzylidene sorbitol composition.

Abstract: In a process for preparing dibenzylidenesorbitol by dehydrocondensation of 1 mol of sorbitol with 2 mols of benzaldehyde in the presence of an acid catalyst, the improvement in which the reaction is carried out in two stages, the first-stage reaction comprising reacting the reactants with heating at a temperature of 50.degree. to 70.degree. C., the first-stage reaction being shifted to the second-stage reaction by adding water and an additional amount of an acid catalyst when the conversion of sorbitol to dibenzylidenesorbitol reaches 10 to 40%, and the second-stage reaction comprising of reacting the mixture in the suspended state at ordinary temperature in 2.5 or more parts by weight, per part by weight of sorbitol, of an aqueous reaction medium, and the resulting dibenzylidenesorbitol is obtained as an aqueous suspension.

Abstract: Purified dibenzylidene sorbitol is prepared by mixing crude dibenzylidene sorbitol containing monobenzylidene sorbitol and tribenzylidene sorbitol as by-product impurities with a lower aliphatic alcohol to dissolve the impurities, and separating and recovering the undissolved dibenzylidene sorbitol. This process affords dibenzylidene sorbitol having a purity of at least 98% from crude dibenzylidene sorbitol with a purity of about 95%.