Abstract: A magnetic powder for a magnetic recording medium includes magnetic particles in which Ba in hexagonal barium ferrite is partially substituted with Sr, wherein a Dx volume represented by Dx volume (nm3) = Dxc × ? × (Dxa/2)2 is 2,200 nm3 or less, and an Sr/(Ba+Sr) molar ratio is 0.01 to 0.15. One that satisfies Ku ? 0.1 × [Sr/(Ba+Sr) molar ratio] + 0.13 is more preferred. For the formulas, Dxc is a crystallite diameter (nm) in a c-axis direction of a hexagonal ferrite crystal lattice, Dxa is a crystallite diameter (nm) in an a-axis direction of the same crystal lattice, ? is a circular constant, and Ku is a magnetocrystalline anisotropy constant (MJ/m3). By providing the hexagonal ferrite magnetic powder formed of fine particles, an effect of improving the perpendicular squareness ratio SQ of a magnetic recording medium is large.

Abstract: [Problem] A hexagonal barium ferrite magnetic powder formed of fine particles, wherein the anisotropic magnetic field distribution of a magnetic recording medium can be made to fall within a range effective in both improving the recording density and improving the SNR is provided. [Solution] A magnetic powder for a magnetic recording medium including magnetic particles in which Ba in hexagonal barium ferrite is partially substituted with Sr, wherein a Dx volume represented by the following formula (1) is 2,200 nm3 or less, an Sr/(Ba+Sr) molar ratio is 0.01 to 0.30, and an anisotropic magnetic field distribution is 1.00 or less. Dx volume (nm3)=Dxc×?×(Dxa/2)2??(1) Here, Dxc is a crystallite diameter (nm) in a c-axis direction of a hexagonal ferrite crystal lattice, Dxa is a crystallite diameter (nm) in an a-axis direction of the same crystal lattice, and n is a circular constant.

Abstract: A hexagonal ferrite magnetic powder is significantly more useful for achieving simultaneously both the enhancement of the recording density and the enhancement of the SNR of a magnetic recording medium. The hexagonal ferrite magnetic powder contains Bi at a Bi/Fe molar ratio in a range of 0.035 or less, has a saturation magnetization ?s of 42.0 Am2/kg or more and a Dx volume calculated based on the crystallite diameters of 1,800 nm3 or less. A method for producing hexagonal ferrite magnetic powder includes a step of performing a treatment of immersing hexagonal ferrite magnetic powder containing Bi in a solution having dissolved therein a compound X that forms a complex with Bi, so as to elute a part of Bi existing in the hexagonal ferrite magnetic powder into the solution.

Abstract: A copper alloy sheet has a chemical composition containing 0.7 to 4.0 wt % of Ni, 0.2 to 1.5 wt % of Si, and the balance being copper and unavoidable impurities, the copper alloy sheet having a crystal orientation which satisfies I{200}/I0{200}?1.0, assuming that the intensity of X-ray diffraction on the {200} crystal plane on the surface of the copper alloy sheet is I{200} and that the intensity of X-ray diffraction on the {200} crystal plane of the standard powder of pure copper is I0{200}, and which satisfies I{200}/I{422}?15, assuming that the intensity of X-ray diffraction on the {422} crystal plane on the surface of the copper alloy sheet is I{422}.

Abstract: An electrical connector connecting a male connector and a female connector in a freely engageable and detachable manner, in which: a male tab is provided at the male connector; a housing part where the male tab is inserted is provided at the female connector; a spring state contact piece and a beat piece to sandwich the male tab are provided at the housing part; and a protrusion protruding toward the male tab inserted into the housing part is provided at least one of the contact piece and the beat piece, wherein the protrusion includes a contact part which is in contact with the male tab inserted into the housing part and a sidewall part which is provided at a periphery of the contact part, and the contact part has so-called a star-shape in a plan view.

Abstract: In a fitting type connecting terminal having male and female terminals, each of which has a tin plating layer formed on an electrically conductive base material, a surface of a contact portion of one of the male and female terminals with the other thereof has a plurality of grooves or recessed portions which are spaced from each other in longitudinal directions, and the grooves or recessed portions are formed so as to satisfy d?b, d?a?L and a+c?L assuming that the width of each of the grooves or recessed portions is a (?m), the depth thereof being b (?m), the distance between two of the grooves or recessed portions adjacent to each other in the longitudinal directions being c (?m), the sliding distance producible between the male terminal and the female terminal in a state that the male terminal is fitted into and fixed to the female terminal being L (?m), and the maximum grain size of the oxide of abrasion powder producible due to sliding between the male terminal and the female terminal being d (?m).

Abstract: An electrical connector connecting a male connector and a female connector in a freely engageable and detachable manner includes, a male tab is provided at the male connector; a housing part where the male tab is inserted is provided at the female connector; a contact piece and a beat piece to hold and press the male tab to enable electrical connection are provided at the housing part; and a protrusion is provided at least at one of the contact piece and the beat piece, and a recessed part capable of accepting the protrusion is provided at the male tab, wherein the contact piece, the beat piece, and the protrusion are constituted to be one component.

Abstract: An electrical connector connecting a male connector and a female connector in a freely engageable and detachable manner includes, a male tab is provided at the male connector; a housing part where the male tab is inserted is provided at the female connector; a contact piece and a beat piece to hold and press the male tab to enable electrical connection are provided at the housing part; and a protrusion is provided at least at one of the contact piece and the beat piece, and a recessed part capable of accepting the protrusion is provided at the male tab, wherein the contact piece, the beat piece, and the protrusion are constituted to be one component.

Abstract: An electrical connector connecting a male connector and a female connector in a freely engageable and detachable manner, in which: a male tab is provided at the male connector; a housing part where the male tab is inserted is provided at the female connector; a spring state contact piece and a beat piece to sandwich the male tab are provided at the housing part; and a protrusion protruding toward the male tab inserted into the housing part is provided at least one of the contact piece and the beat piece, wherein the protrusion includes a contact part which is in contact with the male tab inserted into the housing part and a sidewall part which is provided at a periphery of the contact part, and the contact part has so-called a star-shape in a plan view.

Abstract: In a fitting type connecting terminal having male and female terminals, each of which has a tin plating layer formed on an electrically conductive base material, a surface of a contact portion of one of the male and female terminals with the other thereof has a plurality of grooves or recessed portions which are spaced from each other in longitudinal directions, and the grooves or recessed portions are formed so as to satisfy d?b, d?a?L and a+c?L assuming that the width of each of the grooves or recessed portions is a (?m), the depth thereof being b (?m), the distance between two of the grooves or recessed portions adjacent to each other in the longitudinal directions being c (?m), the sliding distance producible between the male terminal and the female terminal in a state that the male terminal is fitted into and fixed to the female terminal being L (?m), and the maximum grain size of the oxide of abrasion powder producible due to sliding between the male terminal and the female terminal being d (?m).

Abstract: A copper alloy sheet has a chemical composition containing 0.7 to 4.0 wt % of Ni, 0.2 to 1.5 wt % of Si, and the balance being copper and unavoidable impurities, the copper alloy sheet having a crystal orientation which satisfies I{200}/I0{200}?1.0, assuming that the intensity of X-ray diffraction on the {200} crystal plane on the surface of the copper alloy sheet is I{200} and that the intensity of X-ray diffraction on the {200} crystal plane of the standard powder of pure copper is I0{200}, and which satisfies I{200}/I{422}?15, assuming that the intensity of X-ray diffraction on the {422} crystal plane on the surface of the copper alloy sheet is I{422}.