Yazaki Corporation

Dowa Metaltech Co., Ltd.

Dowa Electronics Materials Co., Ltd.

Dowa Thermotech Co., Ltd.

Akifumi Onodera

Hiroto Narieda

Akira Sugawara

Masatoshi Nakamura

Tatsunori Murata

Hisashi Suda

Weilin Gao

Tomotsugu Aoyama

Hirohisa Omoto

Akira Sigawara

Masaki Koshiko

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 σs of 42.0 Am/kg or more and a Dx volume calculated based on the crystallite diameters of 1,800 nmor 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.

Hexagonal ferrite magnetic powder and method for producing same

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}/I{200}&#x2265;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 I{200}, and which satisfies I{200}/I{422}&#x2265;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}.

Copper alloy sheet and method for producing same

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.

Electrical connector and manufacturing method thereof

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&#x2266;b, d&#x2266;a&#x2266;L and a+c&#x2266;L assuming that the width of each of the grooves or recessed portions is(&#x3bc;m), the depth thereof being(&#x3bc;m), the distance between two of the grooves or recessed portions adjacent to each other in the longitudinal directions being(&#x3bc;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(&#x3bc;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(&#x3bc;m).

Fitting type connecting terminal and method for producing same

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.

Growing community of inventors

Shizuoka, Japan

Akifumi Onodera