Abstract: A magnesium-lithium-based alloy contains Mg, Li, and Al, and a sum of a content of the Mg and a content of the Li is 90% by mass or more. The magnesium-lithium-based alloy contains Ge.

Abstract: An alloy member includes a base material that includes a surface layer and is a magnesium-lithium alloy (Mg—Li alloy) having an ?-phase and a ?-phase, and an anticorrosive film is able to be formed on the surface layer. A degree of orientation in a (110) plane of the ?-phase of the Mg—Li alloy is more than or equal to 70%. An average grain size of the Mg—Li alloy is less than or equal to 50 ?m. A Li concentration of the surface layer is lower than a Li concentration of inside of the base material.

Abstract: A magnesium-lithium-based alloy contains Mg, Li, and Al, and a sum of a content of the Mg and a content of the Li is 90% by mass or more. The magnesium-lithium-based alloy contains Ge.

Abstract: A magnesium-lithium-based alloy contains Mg, Li, and Al, and a sum of a content of the Mg and a content of the Li is 90% by mass or more. The magnesium-lithium-based alloy contains Ge.

Abstract: An optical unit, including: an optical element which includes a plurality of reflecting portions and a connecting portion configured to connect the plurality of reflecting portions; a holding member configured to hold the optical element; and a positioning portion provided in the holding member and configured to guide a light beam that has been reflected by the plurality of reflecting portions to a predetermined position, wherein a positioning reference portion configured to be in contact with the positioning portion is provided in the connecting portion.

Abstract: Forming an optical element curved surface mirror with a low surface roughness and high shape precision at a low cost by only forming without employing any one of various types of polishing operations during a manufacturing process. The present invention provides an optical element processing method of forming an optical element by forming a metal base material with a die, and includes a film formation step of forming a metal film on a surface of the metal base material by PVD, CVD, plating, or dipping, and a forming step of forming the metal base material, having the metal film formed on its surface, with the die.

Abstract: The object of the present invention is to enable the manufacture of an optical element curved surface mirror with a low surface roughness and high shape precision at a low cost by only forming without employing any one of various types of polishing operations during a manufacturing process. In order to achieve this object, the present invention provides an optical element processing method of forming an optical element by forming a metal base material with a die, and includes a film formation step of forming a metal film on a surface of the metal base material by PVD, CVD, plating, or dipping, and a forming step of forming the metal base material, having the metal film formed on its surface, with the die.

Abstract: The present invention relates to a sputtering target characterized in that a part of the direction or the tangential direction of grinding the top surface or the both surfaces of the target is parallel to, or within an angle range of ±45 degrees to the warping direction of the target after bonding the target to the backing plate; and when the target is rectangular, the present invention relates to a sputtering target characterized in that the target is rectangular, and a part of the direction or the tangential direction of grinding the top surface or the both surfaces of the target is within a range of angles of the warping direction after bonding the target to the backing plate to the diagonal of the target.