Computer-implemented method for calculating a digital twin of a spectacle lens
AssigneeCarl Zeiss Vision International GmbH
InventorsMartin Reese, Christoph Menke
Life of this patent
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Abstract
A computer-implemented method for calculating a digital twin of a spectacle lens is provided to use the digital twin for a manufacture of the spectacle lens. The digital twin has a predefined power distribution and contains a layer stack with a plurality of individual layers, each layer having a non-uniform layer thickness with a spatial variation and a uniform refractive index. The method includes determining the spatial variation of the layer thicknesses of the individual layers to achieve the predefined power distribution by a spatial control of optical path lengths.
Claims16
A computer-implemented method being configured for calculating a digital twin of a spectacle lens for the purpose of a use of the digital twin for a manufacture of the spectacle lens, the digital twin of the spectacle lens having a predefined power distribution and containing a layer stack with a plurality of individual layers, each layer having a non-uniform layer thickness with a spatial variation and a uniform refractive index, the layer stack comprising individual layers having a different uniform refractive index, respectively, the method comprising the step of:
- determining the spatial variation of the layer thicknesses of the individual layers to achieve the predefined power distribution of the digital twin of the spectacle lens by a spatial control of optical path lengths such that an optical path length through the layer stack is equal to an optical path length through the digital twin in an identical position or in an identical discrete position.
An apparatus comprising a computer and an inkjet printer, the computer comprising a processor configured to perform the step of:
- determining a spatial variation of a layer thickness of each individual layer of a layer stack to achieve a predefined power distribution of a digital twin of a spectacle lens by a spatial control of optical path lengths such that an optical path length through the layer stack is equal to an optical path length through the digital twin in an identical position or in an identical discrete position,
- wherein the computer is configured to send executable instructions to the inkjet printer, and
- wherein the executable instructions, when executed, cause the inkjet printer to print the spectacle lens in layers.
A spectacle lens comprising:
- a predefined power distribution;
- and
- a layer stack with a plurality of individual layers, each layer having a non-uniform layer thickness with a spatial variation and a uniform refractive index, respectively, the layer stack having at least:
- a first plurality of individual layers each having the non-uniform layer thickness with the spatial variation and a first uniform refractive index;
- and
- a second plurality of individual layers each having the non-uniform layer thickness with the spatial variation and a second uniform refractive index, the second uniform refractive index being different from the first uniform refractive index,
- wherein
- all interfaces between individual layers of the first plurality of individual layers and the second plurality of individual layers are configured to contribute to the predefined power distribution in at least one of the following ranges selected from:
- 5% to 25%;
- 10% to 20%;
- and
- 12% to 18%.
A spectacle lens comprising:
- a predefined power distribution;
- and
- a layer stack with a plurality of individual layers, each layer having a non-uniform layer thickness with a spatial variation and a uniform refractive index, the layer stack containing individual layers having a different uniform refractive index, respectively,
- wherein
- a ratio of a minimum layer thickness and a maximum layer thickness of each individual layer is selected from at least one of the following:
- a) the ratio of the minimum layer thickness to the maximum layer thickness of at least 1:5;
- b) the ratio of the minimum layer thickness to the maximum layer thickness of at least 1:8;
- c) the ratio of the minimum layer thickness to the maximum layer thickness of at least 1:10;
- d) the ratio of the minimum layer thickness to the maximum layer thickness of at least 1:12;
- and
- e) the ratio of the minimum layer thickness to the maximum layer thickness of at least 1:15.
Dependencies are inferred from the claim text.