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

Claim 0:
1. A vapor deposition mask including a metal plate and a plurality of mask holes in the metal plate, the vapor deposition mask comprising:
a front surface;
a back surface opposite to the front surface; and
inner surfaces defining respective ones of the plurality of mask holes, wherein
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 of the inner surfaces includes an arcuate stepped surface comprising a plurality of steps 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.