Abstract: A steel wire which has an excellent fatigue limit when made into a spring is provided. A chemical composition of the steel wire according to the present embodiment consists of, in mass %, C: 0.53 to 0.59%, Si: 2.51 to 2.90%, Mn: 0.70 to 0.85%, P: 0.020% or less, S: 0.020% or less, Cr 1.40 to 1.70%, Mo: 0.17 to 0.53%, V: 0.23 to 0.33%, Cu: 0.050% or less, Ni: 0.050% or less, Al: 0.0050% or less, Ti: 0.050% or less, N: 0.0070% or less, Ca: 0 to 0.0050%, and Nb: 0 to 0.020%, with the balance being Fe and impurities. In the steel wire, a number density of V-based precipitates having a maximum diameter ranging from 2 to 10 nm is 500 to 8000 pieces/?m2.

Abstract: A valve spring includes a nitrided layer, and a core portion that is further inward than the nitrided layer. A chemical composition of the core portion consists of, in mass %, C: 0.53 to 0.59%, Si: 2.51 to 2.90%, Mn: 0.70 to 0.85%, P: 0.020% or less, S: 0.020% or less, Cr: 1.40 to 1.70%, Mo: 0.17 to 0.53%, V: 0.23 to 0.33%, Ca: 0.0001 to 0.0050%, Cu: 0.050% or less, Ni: 0.050% or less, Al: 0.0050% or less, Ti: 0.050% or less, and N: 0.0070% or less, with the balance being Fe and impurities. In the core portion, a number density of V-based precipitates having a maximum diameter ranging from 2 to 10 nm is 500 to 8000 per ?m2, and in the core portion, a numerical proportion of Ca sulfides with respect to a total number of oxide-based inclusions and sulfide-based inclusions is 0.20% or less.

Abstract: An object is to provide a laminated polyimide substrate, and a method for the production thereof, in which various properties are ensured and/or provided by effectively controlling changes over time under stringent conditions, while ensuring sufficient adhesion between a polyimide film and metal layer. A laminated polyimide substrate comprises a polyimide layer, an alkali-treated layer derived from the polyimide layer, and a metal layer, arranged in that order, wherein the alkali-treated layer contains an anionic functional group, and is a laminated structure having a layer containing a metal catalyst arranged on the metal layer side and a layer containing a complex of the metal catalyst arranged on the polyimide layer side.

Abstract: This nitrogen oxide concentration measurement device measures a nitrogen oxide concentration by shining light on a sensor produced by distributing a metal complex of porphyrin or a derivative thereof over a base material, and detecting the amount of light of a specific wavelength, said device comprising a light source that shines light at a nitrogen oxide concentration measurement sensor, a light detector that detects the amount of light of a specific wavelength out of all the light transmitted or reflected by the nitrogen oxide concentration measurement sensor, and a controller that corrects the detection result at the light detector so as to match the amount of light of a specific wavelength outputted from the light detector during exposure to a zero gas to a corrected value.

Abstract: A bearing apparatus includes: two split outer ring halves which are mounted to the housing; a plurality of rolling elements which are provided so as to roll on the two split outer ring halves; and a cage which holds the rolling elements such that the rolling elements are disposed at substantially equal intervals in a circumferential direction of the cage and which is split at a position of the cage to form joint surfaces, an outside diameter of the cage being guided by inner circumferential surfaces of the split outer ring halves. An outside diametrical dimension in a normal direction to the joint surfaces is made larger than an outside diametrical dimension of the cage in a direction parallel to the joint surface, and vicinity of an outside diametrical position of the cage lying in the normal direction is made to be guided by the outer ring halves.

Abstract: An object is to provide a laminated polyimide substrate, and a method for the production thereof, in which various properties are ensured and/or provided by effectively controlling changes over time under stringent conditions, while ensuring sufficient adhesion between a polyimide film and metal layer. A laminated polyimide substrate comprising a polyimide layer, an alkali-treated layer derived from the polyimide layer, and a metal layer, arranged in that order, wherein the alkali-treated layer contains an anionic functional group, and is a laminated structure having a layer containing a metal catalyst arranged on the metal layer side and a layer containing a complex of the metal catalyst arranged on the polyimide layer side.

Abstract: A bearing apparatus includes: two split outer ring halves which are mounted to the housing; a plurality of rolling elements which are provided so as to roll on the two split outer ring halves; and a cage which holds the rolling elements such that the rolling elements are disposed at substantially equal intervals in a circumferential direction of the cage and which is split at a position of the cage to form joint surfaces, an outside diameter of the cage being guided by inner circumferential surfaces of the split outer ring halves. An outside diametrical dimension in a normal direction to the joint surfaces is made larger than an outside diametrical dimension of the cage in a direction parallel to the joint surface, and vicinity of an outside diametrical position of the cage lying in the normal direction is made to be guided by the outer ring halves.

Abstract: There is realized a configuration in which, even when pressure is concentrated, the pressure can be adjusted based on accurate and precise detection of pressure distribution, thereby providing sleeping comfort. An air mattress device has a sensor that detects the distribution of pressure applied to an elastic sheet, by means of light emitting parts and light receiving parts of optical fibers uniformly distributed in the elastic sheet. Based on pressure distribution detected by the sensor, the air mattress device adjusts the amount of gas filled in an air mattress. The sensor can be disposed above the air mattress of the air mattress device.

Abstract: A cam follower includes a roller on which a cam rolls. A material ratio Rmr (C) (C: a section level %) of an radially outer surface of the roller is set to relations of 0%<Rmr (10%)?10%, a Kurtosis Rku of a roughness profile of the outer surface is set to 4?Rku?10, an arithmetic mean roughness Ra of the outer surface is set to 0<Ra?0.15, and a compression stress S of the outer surface is set to 800 MPa?S?1,100 MPa.

Abstract: There is provided a cam follower in which a surface roughness of an outer surface of a roller of a cam follower which is in rolling contact with a cam of an engine is obtained individually in an axial direction and a circumferential direction, a skewness Rsk of a profile is formed to be negative, a core roughness depth Rk is made to be 0.3 or less, a reduced valley depth Rvk is made to be 0.3 or less, and a ratio Rk/Rt of the Rk to a maximum height Rt of the profile is made to be 0.19 or more.

Abstract: There is provided a cam follower in which a surface roughness of an outer surface of a roller of a cam follower which is in rolling contact with a cam of an engine is obtained individually in an axial direction and a circumferential direction, a skewness Rsk of a profile is formed to be negative, a core roughness depth Rk is made to be 0.3 or less, a reduced valley depth Rvk is made to be 0.3 or less, and a ratio Rk/Rt of the Rk to a maximum height Rt of the profile is made to be 0.19 or more.

Abstract: A cam follower includes a roller on which a cam rolls. A material ratio Rmr (C) (C: a section level %) of an radially outer surface of the roller is set to relations of 0 %<Rmr (10%)?10 %, a Kurtosis Rku of a roughness profile of the outer surface is set to 4?Rku?10, an arithmetic mean roughness Ra of the outer surface is set to 0<Ra?0.15, and a compression stress S of the outer surface is set to 800 MPa?S?1,100 MPa.

Abstract: The invention provides a cam follower having an outer ring which is used in a state where the cam follower comes into sliding contact or rolling contact with a mating part. The outer ring is configured such that the hardness of a surface layer portion existing between the surface and at least 3 ?m below the surface is Hv 780 to 900, and the hardness of an internal surface portion existing at a depth of 10 ?m or more from the surface is lower than the hardness of the surface layer portion and less than Hv 780. Such hardness can be obtained by performing soft shot blasting or flow barrel processing on a surface layer portion of a base material to be the outer ring.

Abstract: A rocker arm bearing comprising a support shaft in which end faces of shaft end portions of the support shaft are crimped to inner circumferential edges of shaft end inserting holes in opposed side walls and an outer ring which is rotatably supported on a raceway portion at a shaft intermediate portion of the support shaft via a plurality of rollers or directly, wherein an external surface of the raceway portion at the shaft intermediate portion of the support shaft is surface hardened by virtue of quenching, and as a wear-resistant hard coating, a DLC coating is formed on at least the external surface of the raceway portion which is surface hardened.

Abstract: In a bearing apparatus, a support shaft which supports an outer ring is interposed between a pair of opposed side walls in such a manner as to be prohibited from rotating, fitting holes having a hexagonal cross section are provided in the opposed side walls, the whole surface of the support shaft is hardened and fitting grooves having a hexagonal cross section are provided in shaft end faces of the support shaft, the fitting holes and the fitting grooves are disposed at coaxial positions so as to be opposed to each other, and fixing pins are fitted at ends thereof in the fitting holes and the fitting grooves which are made to be opposed to each other, so that the support shaft is fixed to the opposed side walls in such a manner as to be prohibited from rotating.

Abstract: The bearing devices includes a pair of opposed sidewalls, a supporting shaft which is inserted into shaft end insertion holes provided in the both opposed sidewalls, and a roller supported between the both opposed sidewalls by the supporting shaft. The supporting shaft includes a shaft main body that is made of a steel product subjected to a heating process and has a step shape in which the outer diameters of the both shaft ends are smaller than that of a middle portion and caps which is fitted to the both shaft ends and of which the end can be caulked. An end outer-diameter side edge of the cap is caulked to an inner-diameter side edge of the insertion hole.

Abstract: A solder alloy based on an Sn—Zn—In—Ag system contains, in weight, 3.0%<Zn<5.0%, 0.1%<In<4.0%, 0.1%<Ag<0.4%, and the balance Sn. Therefore, the current Sn—Pb soldering method can be employed as it is. Further, a Pb-free solder material having a solder characteristic with excellent bonding strengths of the parts can be provided. Still further, since a difference between a solidus temperature and a liquidus temperature is small, floating of the parts leads can be suppressed, even in case where packaging processes are performed many times over. Still further, when the joint is exposed to the high temperature and high humidity atmosphere, the bonding strength can be prevented from being lowered.