PURPOSE: To prevent the entrance of dust and bubble at the replacing period of the recording liquid and facilitate the easy handling by covering the recording head by means of a cylindrical material consisting in the high molecular substance and filling the both two materials with a recording liquid.
CONSTITUTION: A cylindrical nozzle 3 having a discharge orifice 2 and a piezo- electric element 4 in the cylindrical shape which covers the nozzle 3 are provided in a recording head 1. Then, a recording liquid is fed to the nozzle 3 through a feeding tube 5. The recording head is composed of by the recording head 1 and the feeding tube 5 and the outer part of the head is covered with a cylindrical cover 6. The inside of the cover 6 and the outside of the recording head are stuck with a film 10 formed by a plastic high molecular substance. When the cover 6 itself is made by a plastic high molecular substance, the use of the film 10 may be omitted. Now, a fine ventilating hole 11 less than 100μ in diameter may be recommended to be positioned in a part of the cover 6 preferably.
KOBAYASHI MASATSUNE
MATSUMOTO SHIGEYUKI
HATSUTORI YOSHIJI
