Metal plate for producing vapor deposition masks, production method for metal plates, vapor deposition mask, production method for vapor deposition mask, and vapor deposition mask device comprising vapor deposition mask

A method for manufacturing a metal plate used for manufacturing a deposition mask, comprising

• a preparation step of obtaining the metal plate which is made of an iron alloy containing at least nickel and has a thickness of equal to or less than 30 μm in the form of a rolled steel by rolling,
• wherein an average cross-sectional area of crystal grains on a cross section of the metal plate is from 0.5 μm2 to 50 μm2, the cross section having an angle of from −10° to +10° with respect to a plane perpendicular to a rolling direction of the rolled steel, and
• wherein the average cross-sectional area of crystal grains is calculated by analyzing measurement results obtained by an EBSD method, the measurement results being analyzed by an area method under conditions where a portion with a difference in crystal orientation of equal to or more than 5 degrees is recognized as a crystal grain boundary, and wherein the metal plate has no deformed portions.

A method for manufacturing a metal plate used for manufacturing a deposition mask, comprising:

• a preparation step of obtaining the metal plate which is made of an iron alloy containing at least nickel and has a thickness of equal to or less than 30 μm in the form of plating film by plating,
• wherein an average cross-sectional area of crystals grains on a cross section of the metal plate is from 0.5 μm2 to 50 μm2, the cross section having an angle of from −10° to +10° with respect to a plane perpendicular to a longitudinal direction of the plating film,
• wherein the average cross-sectional area of crystals grains is calculated by analyzing measurement results obtained by an EBSD method, the measuring results being analyzed by an area method under conditions where a portion with a difference in crystal orientation of 5 degrees or more is recognized as a crystal grain boundary, and wherein the metal plate has no deformed portions.