US 11,872,801 B2
Screen printing form for use in a screen printing method, screen printing device, and screen printing method
Sebastian Tepner, Freiburg (DE); Maximilian Pospischil, Freibug (DE); Andreas Lorenz, Freiburg (DE); Linda Ney, Freiburg (DE); Michael Linse, Freiburg (DE); and Florian Clement, Freiburg (DE)
Assigned to Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Munich (DE)
Appl. No. 17/634,012
Filed by Fraunhofer-Gesellschaft zur Förderung der Angewandten Forschung E.V., Munich (DE)
PCT Filed Aug. 3, 2020, PCT No. PCT/EP2020/071833
§ 371(c)(1), (2) Date Feb. 9, 2022,
PCT Pub. No. WO2021/032456, PCT Pub. Date Feb. 25, 2021.
Claims priority of application No. 102019122126.9 (DE), filed on Aug. 16, 2019.
Prior Publication US 2022/0348001 A1, Nov. 3, 2022
Int. Cl. B41F 15/36 (2006.01); H01L 31/0224 (2006.01); H05K 3/12 (2006.01)
CPC B41F 15/36 (2013.01) [H01L 31/022425 (2013.01); H05K 3/1225 (2013.01); B41P 2215/12 (2013.01); B41P 2215/50 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A screen printing form (1, 1′) for use in a screen printing method, the screen printing form comprising:
a screen printing fabric (1b) with a multiplicity of elongate woven fabric elements, which are arranged in a first element direction and a second direction perpendicular thereto;
a stencil (1c) arranged on the screen printing fabric (1b), which has at least one opening formed as a straight channel with a channel width BK;
wherein the woven fabric elements have a first spacing (AF) in the first element direction and a spacing which deviates by less than 5% from the first spacing (AF) in the second element direction, and the woven fabric elements have a diameter (DG) in the first element direction and a first diameter which deviates by less than 5% from the first diameter (DG) in the second element direction;
the channel (1d) encloses with the first element direction an angle (φ) with a tolerance of +/−0.1°, and the channel width BK of the channel is less than or equal to a maximum width (BKmax) associated with the angle (φ), wherein the angle (φ) is one of the following:
the angle φ[°] from the group 11.31°, 14.04°, 18.44°, 26.57°, 45° with an associated maximum width (BKmax) [μm] according to
BKmax=(2DG+AF)sin φ+DG cos φ
or
the angle φ[°]=33.69°, with an associated maximum width (BKmax) [μm] according to
BKmax=(2DG+AF)cos φ+DG sin φ,
and the channel width (BK) is smaller than the spacing between two woven fabric elements in the second thread direction and in the first thread direction.