Abstract: A magnetically soft thin-film is prepared either to be of a composition wherein Fe is used as a principal component, and 0.5 to 20 atomic % of Al, 2 to 25 atomic % of at least one of Zr, Hf, Nb, Ta, Mo and W, 0.05 to 5 atomic % of at lease one of Ag and Cu, 0.5 to 25 atomic % of C and 0.2 to 8 atomic % of O are added as additional elements to the principal component, or to be of a composition wherein 0.1 to 5 atomic % of at least one of rare earth elements such as Ce, Sm and Dy is added further to the above-stated composition. These compositions enable the magnetically soft thin-film to have excellent properties as desired for a magnetic head.

Abstract: An antireflection film is procided on a plastic optical element as follows. An undercoat composed principally of unsaturated silicon exide SiO.sub.x (2>x>1) with a thickness within a range of 200 to 300 nm is formed on the optical element. A multi-layered film of a repeating structure is formed on the undercoat. The multi-layerd film has antireflective characteristics. The undercoat has a refractive index within a range of 1.49 to 1.59. The multi-layered film is composed of alternate lamination of a layer of a material which has a high refractive index and which is composed principally of TiO.sub.2, ZrO.sub.2 or a mixture thereof, and a layer of a material which has a low refractive index and which is composed principally of SiO.sub.x (2.gtoreq.x.gtoreq.1).

Abstract: A magnetic head includes a first core having magnetic materials joined together through a magnetic gap, a second core having a magnetic material, and a coil formed with a thin film around a magnetic joining part between the first core and the second core.

Abstract: In a method of manufacturing a thin film, evaporated particles are generated by a vapor source and are clustered. The clustered evaporated particles are deposited onto a substrate in a vacuum atmosphere without ionizing the particles. A partial pressure of water in the vacuum atmoshpere is controlled to not more than 5.times.10.sup.-6 Torr. A temperature of the substrate is maintained to be 150.degree. C. or lower. A film according to this method has a high adhesion characteristics and a high mechanical strength without heating the substrate to a high temperature and without damaging the substrate by ions.

Abstract: An evaporation material is employed to form an optical thin film which is adapted to be formed on an optical element such as a lens or the like. The evaporation material is provided such that zirconium oxide (ZrO.sub.2) is mixed with a titanium oxide (TiO.sub.A) having a molar ratio A(O/Ti) of oxygen to titanium in a range of 1.0 to 1.75 so that the mixture assumes a molar ratio (Ti/Zr) of titanium to zirconium in a range of 1.0 to 4.0. The mixture is sintered or fused and solidified.

Abstract: A magnetic alloy which contains Fe; 1-15 at. %, at least one element selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Mo and W; 1-10 at. %, at least one element selected from among platinum group elements; 0.1-5 at. %, at least one element selected from the group consisting of Cu, Ag, Au and Cd; 1-20 at. %, at least two elements selected from the group consisting of C, O, B and N; and 3-10 at. %, Al.

Abstract: A sputtering apparatus comprises at least one pair of first sputtering targets arranged in counterposition; a second sputtering target provided substantially on a concentric circle having the center axis of the first sputtering targets; and a substrate holder for holding a substrate to be coated with particles of target materials emitted from the first sputtering targets and the second sputtering target, which is provided substantially on another concentric circle having the center axis outside the second sputtering target.

Abstract: A magnetic head has a magnetic core comprising a first half core on which a thin magnetic metal film is deposited and a second half core which is opposed to the first half core across a magnetic gap. The film thickness of the thin magnetic metal film of the first half core continuously varies at about a constant rate within a portion thereof adjacent to the effective portion of the magnetic gap.

Abstract: A magnetic head including pair of core halves joined opposite to each other, each core half including a first magnetic material on which is deposited a magnetic film of a second magnetic material having a high saturation magnetic flux density and a low magnetic permeability compared with the first magnetic material, both the magnetic films having a magnetic gap arranged therebeteween, includes a pair of nonmagnetic members, each of which is adjacent to each end of the magnetic gap, in a surface of the head, along which a recording medium slides, wherein each of the magnetic films extends along the outer edge of the nonmagnetic member adjacent to one of the core halves, and the boundary between the first magnetic material and the second magnetic material includes a portion extending outward and a portion extending parallel to the magnetic gap and out of alignment with the first-mentioned portion.

Abstract: A magnetic head is disclosed. The magnetic head has a block which is formed of a first magnetic material in which a groove for a winding is formed, a first magnetic film which is deposited on a surface of the block in which the groove is formed and is formed of a second magnetic material having a higher saturation magnetic flux density than that of the first magnetic material, a nonmagnetic film which is formed on the first magnetic film and serves as a magnetic gap, a second magnetic film which is deposited on the nonmagnetic film and is formed of the second magnetic material, and a reinforcing block. A portion of the reinforcing block on the side of a magnetic recording medium slide surface is formed of a nonmagnetic material, and the other portion is formed of a magnetic material. A magnetic material-side boundary portion between the nonmagnetic and magnetic materials is inclined to form an acute angle with the nonmagnetic film.

Abstract: A magnetic head comprises a first magnetic core member of a magnetic material bulk having one surface thereof as a gap forming surface, a gap member of a non-magnetic material attached to at least a portion of the gap forming surface of the first magnetic core member, and a second magnetic core member of a magnetic material thin film attached to said gap forming surface substantially perpendicularly thereto with the gap member being interleaved therebetween.

Abstract: A magnetic head in which a first magnetic film made of a material of high saturation magnetic flux density is deposited on the surface of a block made of a high permeability material and which contains a groove for winding. A nonmagnetic film made of a nonmagnetic material and serving as a magnetic gap is formed on the first magnetic film; and a second magnetic film made of a material of high saturation magnetic flux density is further formed on the nonmagnetic film. A reinforcing block is arranged on the second magnetic film and has a nonmagnetic material portion exposed to a slide surface of a recording medium. The high permeability material block, the first magnetic film and the second magnetic film together constitute a magnetic core, and the second magnetic film is bonded with the reinforcing block.

Abstract: A magnetic head including a head base consisting of blocks, and having a penetration hole therethrough, a magnetic thin film formed on the head base to define a magnetic circuit and a coil wound around the magnetic thin film and the head base through the penetration hole.

Abstract: A magnetic head including first and second magnetic core assemblies is provided, wherein the first assembly has a first portion forming a magnetic gap, a pair of second portions of magnetic material arranged on both sides of the first portion, and a pair of third portions of non-magnetic material arranged at a position adapted to sandwich the pair of second portions. The second magnetic core assembly includes a fourth portion of magnetic material which forms a magnetic circuit together with the pair of second portions. The head also has a groove facing at least one of first and second magnetic core assemblies for receiving a winding.

Abstract: The present invention relates to an instantaneous adhesive composition which is satisfactorily made thixotropic or gelled and has a rapid setting time and an excellent adhesive strength, said composition being obtained by adding to an .alpha.-cyanoacrylate a silica gel treated with a silyl isocyanate.

Abstract: A process for producing an .alpha.-cyanoacrylate which comprises reacting a cyanoacetate with formaldehyde in the presence of a catalyst and a solvent, wherein a compound having phase transfer catalytic activity is used as the catalyst.