A droplet ejection head and method of operation

A method of cooling one or more actuator drive electronic components for a droplet ejection head comprising one or more actuator components and an inlet path to supply fluid to said one or more actuator components and an outlet path to remove fluid from said one or more actuator components;

• wherein said one or more actuator components include a plurality of fluid chambers;
• wherein said fluid chambers include at least one nozzle;
• and wherein said fluid chambers are actuable to eject one or more droplets via said at least one nozzle in response to ejection instructions;
• wherein said plurality of fluid chambers are fluidically connected at a respective first end to said inlet path and are fluidically connected at a respective second end to said outlet path;
• wherein said outlet path includes one or more heat exchangers arranged serially downstream of the one or more actuator components;
• wherein one or more actuator drive electronic components are arranged adjacent to each of said heat exchangers;
• wherein said one or more heat exchangers include one or more heat exchanger fluid paths, such that in use heat transfers from said actuator drive electronic components to said one or more heat exchangers and is removed via the return fluid;
• and
• wherein the area demarcated by the actuator drive electronic components is substantially contained within the area demarcated by said one or more heat exchanger fluid paths, wherein said method includes, in turn:
• supplying fluid to said one or more actuator components via said inlet path;
• and
• removing fluid from said one or more actuator components via said outlet path and introducing fluid into the heat exchanger fluid path such that it flows through the one or more heat exchangers and removes heat transferred to said heat exchanger from said actuator drive electronic components via the fluid flowing through the one or more heat exchangers.