PURPOSE: To obtain electronic machinery capable of selectively controlling the number of emission times of ink based on dot information, by providing a control means for controlling heat energy acting on a recording means so as to selectively control the number of emission times of a liquid for the purpose of outputing dot information obtained from a lead-out means on the basis of concn. information.

CONSTITUTION: A recording part 1 consists of a lid base plate 2 having a groove functioning as an ink lead-out pipe, a heater base plate 3, an ink tank 4, an ink supply box 5, an ink receiving part 6 recovering flooded ink to return the same, a pump 6', a signal wire 7 and an ink pipe etc. A large number of grooves 13 corresponding to the number of dots are engraved in the grooved lid base plate 2 in almost parallel and heaters 14 are constituted on the heater base plate 3 at the parts on the way of the grooves corresponding to the grooves. When the heaters 14 are heated by the supply of a current, the ink in the grooves is heated to abruptly generate air bubbles 16' and extruded by the pressure of air bubbles to be quickly emitted as liquid droplets 8 from an emitting port. As mentioned above, the heater corresponding to a necessary dot is selectively heated by the supply of a current and the ink in the groove corresponding to said heater is quickly emitted from an orifice OD to be recorded on printing paper 9.