Abstract: The steel shaft component consists of C: 0.40 to 0.60%, Si: 0.05 to 1.00%, Mn: 1.00 to 2.00%, P: 0.030% or less, S: 0.005 to 0.100%, Cr: 0.10 to 0.50%, V: 0.10 to 0.30%, Al: 0.005 to 0.050%, N: 0.0050 to 0.0200%, Ti: 0 to 0.050%, and the balance: Fe and impurities. A Vickers hardness Hs of the surface of the shaft part is 620 HV or more. A Vickers hardness Hb at an R/2 position satisfies Formula (1). A depth of the hardened layer Hr (mm) having a Vickers hardness of 620 HV or more satisfies Formula (2). The microstructure at the R/2 position is composed of ferrite and pearlite. Within the hardened layer, the number of density of V-containing precipitates having an equivalent circular diameter of more than 100 nm is 10 particles/276 ?m2 or less. Hs/2.3?Hb?350??(1) 0.05?Hr/R?0.

Abstract: A method of manufacturing an optical member includes: providing a polycrystalline wavelength conversion member including phosphor particles and having a first surface and a second surface opposite to the first surface; forming a modified portion inside the wavelength conversion member by focusing laser light inside the wavelength conversion member; and cleaving the wavelength conversion member with the modified portion being a starting point, which includes pressing the wavelength conversion member from a first surface side.

Abstract: Provided is a precise alignment method for an optical component that positions a slider to X-axis and Y-axis coordinates of maximal intensity in a manner such that frame images of a laser beam passing through an optical waveguide are captured while relatively moving the slider and a semiconductor laser device at a uniform speed in the X and Y directions, the X-axis coordinate of the maximal intensity is calculated by performing a fitting calculation only in the X direction, frame images of a laser beam passing through the optical waveguide are captured by relatively moving the slider and the semiconductor laser device at a uniform speed only in the Y direction while the X-axis coordinate is fixed, and the Y-axis coordinate of the target maximal intensity is calculated by performing a fitting calculation only in the Y direction.

Abstract: Provided is a precise alignment method for an optical component that positions a slider to X-axis and Y-axis coordinates of maximal intensity in a manner such that frame images of a laser beam passing through an optical waveguide are captured while relatively moving the slider and a semiconductor laser device at a uniform speed in the X and Y directions, the X-axis coordinate of the maximal intensity is calculated by performing a fitting calculation only in the X direction, frame images of a laser beam passing through the optical waveguide are captured by relatively moving the slider and the semiconductor laser device at a uniform speed only in the Y direction while the X-axis coordinate is fixed, and the Y-axis coordinate of the target maximal intensity is calculated by performing a fitting calculation only in the Y direction.

Abstract: An abrasive is produced by crushing a cured product of a phenol resin composition into particles, and washing with water and drying the particles. The phenol resin composition may comprise as principal constituents a phenol resin and an organic filler, or a phenol resin, an organic filler and an inorganic filler.

Abstract: The apparatus for sealing the heads of containers with a biaxially oriented plastic film comprises a horizontal conveyor for conveying the containers to be sealed, and a horizontal endless belt disposed above the conveyor in parallel thereto and including a lower traveling portion adapted to be driven in the same direction as the conveyor at a speed equal to the speed of the conveyor.