Abstract: A strain sensor may have a conductive elastic yarn including a first fiber having a predetermined length and a shape of a fiber yarn and a second fiber having electrical conductivity and a sheet shape. The strain sensor may have a pair of wiring members electrically connected to both ends of the conductive elastic yarn. The conductive elastic yarn, with the second fiber wrapped around the first fiber, is twisted in a coil shape.

Abstract: An aspect of the present invention provides an Fe—Ni alloy metal foil having excellent heat resilience, where the Fe—Ni alloy metal foil is prepared by an electroforming (EF) method and has a thickness of 100 ?m or less (except O ?m), wherein the Fe—Ni alloy metal foil comprises, by wt %, Ni: 34-46 %, a remainder of Fe and inevitable impurities, and wherein the Fe—Ni metal foil has a degree of heat resilience in an amount of 30 ppm or less.

Abstract: Provided are a deposition mask having a plurality of fine through-holes formed on a metal foil; a metal foil to be used therein; manufacturing methods therefor; and an organic EL device manufacturing method using the deposition mask, and an Fe—Ni alloy metal foil to be used as a deposition mask, including 34-46 wt % of Ni and the balance of Fe and inevitable impurities. The metal foil includes a pattern formation area and an uncoated area on at least one surface thereof, the pattern formation area is thinner than the uncoated area and has low surface roughness, and the uncoated area is positioned at the edge of the metal foil so as to surround the pattern formation area.

Abstract: An aspect of the present invention provides an Fe—Ni alloy metal foil having excellent heat resilience, where the Fe—Ni alloy metal foil is prepared by an electroforming (EF) method and has a thickness of 100 ?m or less (except O ?m), wherein the Fe—Ni alloy metal foil comprises, by wt %, Ni: 34-46 %, a remainder of Fe and inevitable impurities, and wherein the Fe—Ni metal foil has a degree of heat resilience in an amount of 30 ppm or less.