Patent ID: 11877499
Assignee: TOPPAN PRINTING CO., LTD.
Field: Surface technology, coating (Chemistry)
Classification: CPC H  C  G | IPC B  C  H

Claim 6:
7. A method for manufacturing a vapor deposition mask according to claim 1 including a metal plate and a plurality of mask holes in the metal plate, the method comprising:
forming a vapor deposition mask by forming the plurality of mask holes in the metal plate, wherein
the vapor deposition mask includes:
a front surface;
a back surface opposite to the front surface; and
inner surfaces defining respective ones of the plurality of mask holes,

each of the plurality of mask holes extends between the front surface and the back surface,
in a plan view of the front surface, each of the plurality of mask holes includes a first opening, which is located at the front surface, and a second, smaller opening, which is located inside the first opening,
at least a section of each of the plurality of mask holes has a shape of an inverted frustum extending between the first opening and the second, smaller opening, and
each inner surface includes an arcuate stepped surface spreading from the second, smaller opening toward the first opening as viewed in a cross-section orthogonal to the front surface,
the arcuate stepped surface has two steps,
as viewed in a cross-section orthogonal to the front surface, the arcuate stepped surface has an arcuate section having two arcuate steps,
the arcuate section includes a first arc and a second arc that is located closer to the mask back surface than the first arc,
the first arc has a first curvature radius and the second arc has a second, larger curvature radius,
as viewed in the cross-section the second arc has a center of curvature, the center of curvature is outside the first opening in the thickness direction of the metal plate,
forming a vapor deposition mask includes forming a resist mask on the metal plate and forming the stepped surface by etching once using the resist mask,
the resist mask includes a resist front surface that is a surface of the resist mask opposite to the surface in contact with the metal plate, a first pattern to form the second arc and a second pattern to form the first arc,
the first pattern and the second pattern extend through the resist mask in the thickness direction of the resist mask,
as viewed in a plan view of the resist front surface, two of the second patterns are located on the opposite sides of the first pattern.