A method of operating an electrostatic ink jet printhead, the printhead comprising: one or more ejection tips from which, in use, ink is ejected, the one or more ejection tips defining a tip region; a printhead housing, the printhead housing defining a cavity in which the one or more ejection tips are located; the method comprising the steps of, during a printing operation, passing a vapour into the cavity to reduce evaporation of ink in the tip region.

A method of operating an electrostatic ink jet printhead, the printhead comprising: one or more ejection tips from which, in use, ink is ejected, the one or more ejection tips defining a tip region; a printhead housing, the printhead housing defining a cavity in which the one or more ejection tips are located; the method comprising the steps of, during a printing operation, passing a vapour into the cavity to reduce evaporation of ink in the tip region.

A controller circuit board outputs image data. A head circuit board controls a head unit in accordance with a setting data list. An engine circuit board controls a sheet transportation unit, and sets setting data in the setting data list in accordance with a command from the controller circuit board. The head circuit board receives the image data from the controller circuit board not through the engine circuit board. The controller circuit board outputs a backup command and thereby causes the engine circuit board to acquire the setting data list from the head circuit board, acquires it from the engine circuit board, and store it in a storage device, and outputs a restoration command and a setting data list read from the storage device and thereby causes the engine circuit board to renew the setting data list in the head circuit board.

A controller circuit board outputs image data. A head circuit board controls a head unit in accordance with a setting data list. An engine circuit board controls a sheet transportation unit, and sets setting data in the setting data list in accordance with a command from the controller circuit board. The head circuit board receives the image data from the controller circuit board not through the engine circuit board. The controller circuit board outputs a backup command and thereby causes the engine circuit board to acquire the setting data list from the head circuit board, acquires it from the engine circuit board, and store it in a storage device, and outputs a restoration command and a setting data list read from the storage device and thereby causes the engine circuit board to renew the setting data list in the head circuit board.

A method of operating an electrostatic ink jet printhead, the printhead comprising: one or more ejection tips from which, in use, ink is ejected, the one or more ejection tips defining a tip region; a printhead housing, the printhead housing defining a cavity in which the one or more ejection tips are located; the method comprising the steps of, during a printing operation, passing a vapour into the cavity to reduce evaporation of ink in the tip region.

A compliant micro device transfer head and head array are disclosed. In an embodiment a micro device transfer head includes a spring portion that is deflectable into a space between a base substrate and the spring portion.

A compliant micro device transfer head and head array are disclosed. In an embodiment a micro device transfer head includes a spring portion that is deflectable into a space between a base substrate and the spring portion.

A compliant micro device transfer head and head array are disclosed. In an embodiment a micro device transfer head includes a spring portion that is deflectable into a space between a base substrate and the spring portion.