A hand held inkjet pen includes a housing, an ink reservoir, an inkjet printhead and a spacer. The ink reservoir is located within the housing. The inkjet printhead is located toward a distal end of the housing, and includes a plurality of nozzles for ejecting ink received from the reservoir. The spacer is located at the distal end of the housing for contacting a media sheet. Force applied to the spacer selects an on state for controlling ejection of ink from the plurality of nozzles.
A writing instrument comprising a liquid spray head and a processor unit serving to activate the spray head. The instrument further comprises measurement means for measuring the distance between the spray head and the medium, and movement detector means, the processor unit being adapted to activate the liquid spray head when at least the measurement means determine that the distance between the spray head and the medium is less than a predetermined maximum value, the processor unit also being adapted to manage activation of the spray head as a function of the movement detected by the movement detector means.
