Film formation mask

Abstract

Provided is a film formation mask capable of preventing slit-like openings from being closed by vibrations so as to form a highly precise patterned film with stability. In a film formation mask formed by providing multiple slit-like openings in a metal foil, the shape of the opening of at least one end of the slit-like openings is asymmetrical with respect to a center line of the width direction of the slit-like openings.

1 . A film formation mask, comprising a metal foil fixed to a frame body with stronger tension applied to the metal foil in one direction than in another direction, wherein:
 the metal foil includes slit-like openings elongated in the one direction, which are repeatedly provided in a short side direction of the slit-like openings; and   a shape of at least one end of each of the slit-like openings is asymmetrical with respect to a center line of a short side of the slit-like openings.   
     
     
         2 . The film formation mask according to  claim 1 , wherein shapes of both ends of the slit-like openings are asymmetrical with respect to the center line of the short side of the slit-like openings and symmetrical with respect to a center line of a long side of the slit-like openings. 
     
     
         3 . (canceled)