Computer-implemented method for determining printing parameter values of an inkjet printing device, a data processing system, a method for inkjet printing and an inkjet printing device

A data processing system comprising:

• a processor;
• and
• a storage medium coupled to the processor,
• wherein the processor is configured to determine printing parameter values of an inkjet printing device for printing a pattern on a surface of a spectacle lens substrate having a curved surface, the inkjet printing device including a printhead as one single component with a plurality of printing nozzles, based on a computer program stored on the storage medium, wherein the processor is configured to group the plurality of printing nozzles into at least two printing nozzle groups and individually determine a printing parameter value for at least one adjustable printing parameter of each printing nozzle group, wherein the at least one adjustable printing parameter is selected from the group consisting of ejection temperature, jetting duration, jetting frequency, norm value, a wave form parameter, and an adjustable ink property,
• wherein the method step (S3) of individually determining the printing parameter value for the at least one adjustable printing parameter comprises deducing a parameter map including assigning different printing parameters to different regions of the curved surface, and
• wherein the parameter map is deduced by optimizing a cost function applied to a correlation of parameters describing the geometric relationship between the curved surface of the spectacle lens substrate and the printhead with printing parameter values for the adjustable printing parameters.

A computer program comprising instructions which, when the program is executed by a computer, cause the computer to:

• determine printing parameter values of an inkjet printing device for printing a pattern on a surface of a spectacle lens substrate having a curved surface, the inkjet printing device including a printhead as one single component with a plurality of printing nozzles, wherein the instructions cause the computer to group the plurality of printing nozzles into at least two printing nozzle groups and individually determine a printing parameter value for at least one adjustable printing parameter of each printing nozzle group, wherein the at least one adjustable printing parameter is selected from the group consisting of an ejection temperature, a jetting duration, a jetting frequency, a norm value, a wave form parameter, and an adjustable ink property,
• wherein the method step (S3) of individually determining the printing parameter value for the at least one adjustable printing parameter comprises deducing a parameter map including assigning different printing parameters to different regions of the curved surface, and
• wherein the parameter map is deduced by optimizing a cost function applied to a correlation of parameters describing the geometric relationship between the curved surface of the spectacle lens substrate and the printhead with printing parameter values for the adjustable printing parameters.

A non-transitory computer-readable storage medium comprising instructions which, when executed by a computer, cause the computer to:

• determine printing parameter values of an inkjet printing device for printing a pattern on a surface of a spectacle lens substrate having a curved surface, the inkjet printing device including a printhead as one single component with a plurality of printing nozzles, wherein the instructions cause the computer to group the plurality of printing nozzles into at least two printing nozzle groups and individually determine a printing parameter value for at least one adjustable printing parameter of each printing nozzle group, wherein the at least one adjustable printing parameter is selected from the group consisting of an ejection temperature, a jetting duration, a jetting frequency, a norm value, a wave form parameter, and an adjustable ink property,
• wherein the method step (S3) of individually determining the printing parameter value for the at least one adjustable printing parameter comprises deducing a parameter map including assigning different printing parameters to different regions of the curved surface, and
• wherein the parameter map is deduced by optimizing a cost function applied to a correlation of parameters describing the geometric relationship between the curved surface of the spectacle lens substrate and the printhead with printing parameter values for the adjustable printing parameters.

An inkjet printing device for printing a pattern on a surface of a spectacle lens substrate having a curved surface, the inkjet printing device comprising:

• a printhead as one single component with a plurality of printing nozzles;
• and
• a data processing system including a processor and a storage medium coupled to the processor, wherein the processor is configured to determine printing parameter values based on a computer program stored on the storage medium,
• wherein the processor is configured to group the plurality of printing nozzles into at least two printing nozzle groups and individually determine a printing parameter value for at least one adjustable printing parameter of each printing nozzle group, wherein the at least one adjustable printing parameter is selected from the group consisting of an ejection temperature, a jetting duration, a jetting frequency, a norm value, a wave form parameter, and an adjustable ink property,
• wherein the method step (S3) of individually determining the printing parameter value for the at least one adjustable printing parameter comprises deducing a parameter map including assigning different printing parameters to different regions of the curved surface, and
• wherein the parameter map is deduced by optimizing a cost function applied to a correlation of parameters describing the geometric relationship between the curved surface of the spectacle lens substrate and the printhead with printing parameter values for the adjustable printing parameters.