US 12,481,805 B2
Method for inkjet printing a spectacle lens
Martin Reese, Aalen (DE)
Assigned to Carl Zeiss Vision International GmbH, Aalen (DE)
Filed by Carl Zeiss Vision International GmbH, Aalen (DE)
Filed on Jan. 2, 2025, as Appl. No. 19/007,644.
Application 19/007,644 is a continuation of application No. PCT/EP2023/068869, filed on Jul. 7, 2023.
Claims priority of application No. 22183675 (EP), filed on Jul. 7, 2022.
Prior Publication US 2025/0131148 A1, Apr. 24, 2025
Int. Cl. G06F 30/17 (2020.01); B33Y 50/00 (2015.01); B33Y 80/00 (2015.01)
CPC G06F 30/17 (2020.01) [B33Y 50/00 (2014.12); B33Y 80/00 (2014.12)] 23 Claims
OG exemplary drawing
 
1. A computer-implemented method for calculating a digital twin of a spectacle lens for a purpose of a use of the digital twin for a manufacture of the spectacle lens, the digital twin comprising a layer stack, wherein one of a following conditions for a dithering placement of a volume element applies:
when in 50% or in less than 50% of discrete xm,ym,zm . . . xn,yn,zn positions of an adjacent layer of the layer stack the volume element is positioned, then no volume element is positioned in discrete xm+1,ym+1,zm+1 . . . xn+1,yn+1,zn+1 positions of a layer of the layer stack, a discrete xm+1,ym+1,zm+1 . . . xn+1,yn+1,zn+1 position of the layer being directly adjacent and on top of a respective discrete xm,ym,zm . . . xn,yn,zn position of the adjacent layer;
when in more than 50% of discrete xm,ym,zm . . . xn, yn,zn positions of an adjacent layer of the layer stack a volume element is positioned, then volume elements are positioned in at least one of:
discrete xm+1a . . . z,ym+1a . . . z,zm+1a . . . z . . . xn+1a . . . z,yn+1a . . . z,zn+1a . . . z positions of a layer of the layer stack, a discrete xm+1a . . . z,ym+1a . . . z,zm+1a . . . z . . . xn+1a . . . z,yn+1a . . . z,zn+1a . . . z position of the layer not being directly adjacent and not being on top of a respective discrete xm,ym,zm . . . xn,yn,zn position of the adjacent layer, or
discrete xm+1,ym+1,zm+1 . . . xn+1,yn+1,zn+1 positions of a layer of the layer stack, a discrete xm+1,ym+1,zm+1 . . . xn+1,yn+1,zn+1 position of the layer being directly adjacent and on top of a respective discrete xm, ym,zm . . . xn,yn,zn position of the adjacent layer,
wherein the dithering placement minimizes a formation of a residual structure in the layer stack, and
wherein the dithering placement results in a variation of a volume element density based on the conditions for the dithering placement of the volume element, the variation of the volume element density in the layer of the layer stack being a digital representation of a variation of ink droplets in the layer.