Convergent aerosol-generator

An aerosol-generator for an aerosol-generating device, the aerosol-generator comprising:

• a surface acoustic wave atomiser comprising:
• a substrate comprising an active surface defining an atomisation region,
• a first transducer positioned on the active surface of the substrate to generate surface acoustic waves in a first direction along the active surface towards the atomisation region, and
• a second transducer positioned on the active surface of the substrate to generate surface acoustic waves in a second direction along the active surface towards the atomisation region, wherein the first direction is different from the second direction;
• a supply element arranged to supply a liquid aerosol-forming substrate to the atomisation region;
• and
• a controller configured to provide a first drive signal to the first transducer and a second drive signal to the second transducer,
• wherein the first drive signal is different from the second drive signal.

An aerosol-generator for an aerosol-generating device, the aerosol-generator comprising:

• a surface acoustic wave atomiser comprising:
• a substrate comprising an active surface defining an atomisation region, and at least one transducer positioned on the active surface of the substrate to generate surface acoustic waves for defining an acoustic wavefront on the active surface of the substrate;
• and
• a supply element arranged to supply a liquid aerosol-forming substrate to the atomisation region so that liquid aerosol-forming substrate in the atomisation region defines an interface between the active surface, the liquid aerosol-forming substrate, and the atmosphere,
• wherein the at least one transducer and the supply element are configured so that a shape of the acoustic wavefront at the interface corresponds to a shape of at least part of the interface;
• wherein the at least one transducer comprises a first interdigital transducer comprising a first array of interleaved electrodes and a second interdigital transducer comprising a second array of interleaved electrodes, and
• wherein a spacing between consecutive electrodes of the first array of interleaved electrodes is different from a spacing between consecutive electrodes of the second array of interleaved electrodes.