Abstract: A printing device includes a reservoir accommodating a fluid, a first nozzle disposed on the bottom of the reservoir, the first nozzle including a plurality of nozzle holes through which the fluid is discharged as a droplet, first electrodes disposed on at least a portion of the bottom of the first nozzle, corresponding to the plurality of nozzle holes and a first insulating layer surrounding the first electrodes.

Abstract: A laser pressure head module including: a pressure member including: a first light-transmitting member; a second light-transmitting member; and a sealed space between the first light-transmitting member and the second light-transmitting member; and a gas supply unit to supply gas to the sealed space to generate a pressing force. The second light-transmitting member is to be expanded or moved in an external direction by the pressing force.