Kobe Steel, Ltd.

Kobelco Research Institute, Inc.

Norihiro Jiko

Junichi Nakai

Katsutoshi Takagi

Takayuki Hirano

Yuki Tauchi

Mototaka Ochi

Hideo Fujii

Yuki Tao

Hitoshi Matsuzaki

Kenta Hirose

Masaya Ehira

Hironori Kakiuchi

An oxide sintered body is obtained by sintering indium oxide, gallium oxide and tin oxide. The oxide sintered body has a relative density of 90% or more and an average grain size of 10 &#x3bc;m or less. In the oxide sintered body, the relations 30 atomic %&#x2264;[In]&#x2264;50 atomic %, 20 atomic %&#x2264;[Ga]&#x2264;30 atomic % and 25 atomic %&#x2264;[Sn]&#x2264;45 atomic % are satisfied. [In], [Ga] and [Sn] are ratios of contents (atomic %) of indium gallium and tin, respectively, to all metal elements contained in the oxide sintered body. The oxide sintered body has an InGaOphase which satisfies the relation [InGaO]&#x2265;0.05.

Oxide sintered body and sputtering target, and method for producing same

Provided is an electrical contact member which is capable of maintaining stable conductivity over a long period of time, while achieving low adhesion to a test subject, in particular, an electrical contact member which is capable of maintaining stable electrical contact over a long period of time by suppressing increase in the contact resistance, while achieving low adhesion to a test subject even after repeated contact at high temperatures around 85&#xb0; C. or after being left in the atmosphere for a long period of time. The present invention relates to an electrical contact member, which repeatedly comes into contact with a test subject, and wherein the surface of the electrical contact member, said surface coming into contact with the test subject, is configured of a carbon coating film that contains Pd.

Electrical contact member

An optical information recording medium of the present invention is a read-only optical information recording medium in which at least one reflective film formed of an Al-based alloy and at least one light transmission layer are successively laminated on a substrate. The arithmetical mean roughness of the reflective film is 0.5 nm or less, and the thickness of the reflective film is 25 nm or more. The optical information recording medium of the present invention is the read-only optical information recording medium including the reflective film which has a high reflectivity and low jitter, preferably has excellent durability, and is used particularly appropriately in an optical disc using a blue laser such as BD-ROM or HD DVD-ROM.

Read-only optical information recording medium

An optical recording medium of a pitting recording type, to which recording marks are formed by irradiation with a violet laser beam having a wavelength &#x3bb; in the range of about 380 to about 450 nm, includes a substrate having a surface provided with guide grooves and lands, and a metal recording layer in which recording marks are formed by irradiation with a laser beam. The guide grooves and the lands meet conditions expressed by:&#x3bb;/18&#x2266;D&#x2266;&#x3bb;/11&#x2003;&#x2003;(1)1.5&#x2266;W/W&#x2266;3.5&#x2003;&#x2003;(2)Where &#x3bb; is the wavelength of the laser beam used for writing and reading, D, is the depth of the grooves, Wis the width of the grooves, and Wis the width of lands formed on the substrate, and the wavelength &#x3bb; is in the range of 380 to 450 nm.

Optical recording medium

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Kobe, Japan

Norihiro Jiko