Abstract: In a liquid jet recording head having a liquid discharging conduit, the ratio of the average cross-sectional area of the conduit at the liquid introducing region to that at the energy actuating region is greater than 1.

Abstract: A method of making an ink jet head with an orifice plate having an orifice extending therethrough for ink ejection involves the steps of adhering a photosensitive plate to the ink jet head to cover the outlet of a liquid passageway in the head, aligning a pattern mask with the ink passageway, exposing the photosensitive plate in-situ to radiation through the pattern mask, and removing portions of the photosensitive plate in accordance with the radiation pattern to form in the photosensitive plate an orifice aligned with the outlet.

Abstract: A liquid jet recording method using a recording head provided with a liquid jet part comprising an orifice through which the liquid is jetted to form a flying liquid droplet and a heat action section in communication with said orifice in which section the thermal energy for jetting the liquid acts on said liquid, and an electro-thermal transducer serving as means for generating the thermal energy, said method characterized in that said thermal energy is made to act on the liquid filling said heat action section so as to jet from said orifice such amount of liquid sufficient enough to include unnecessary bubbles generated in said liquid jet part and a liquid droplet is formed by said jetted liquid whereby said unnecessary bubbles are eliminated from said liquid jet part while repeating said liquid droplet formation to perform recording with said droplets. Further, said method is characterized by applying to said electro-thermal transducer a driving signal having a voltage value in the range of 1.02 to 1.

Abstract: In a liquid jet recording apparatus provided with a recording head for discharging recording liquid as flying liquid droplets, a head mounting portion for fixing the recording head, and liquid supply means for supplying the recording liquid to the recording head, the recording head and the head mounting portion are removably mounted by fixing means and the liquid supply means is removably connected to the recording head by coupling means.

Abstract: An ink jet recording apparatus has an improved head plate having a plurality of recording heads, a plurality of openings corresponding to the outlet port of each recording head, and a guide groove to lead ink liquid from the openings to a discharge port, the guide groove being gradually tapered downwardly to the discharge port.

Abstract: In a liquid jet recording apparatus comprising a liquid jet section including orifice means for discharging a liquid to form flying droplets and liquid path means communicating with said orifice means and having as a part an energy acting portion for causing the energy to act on the liquid to form said flying droplets, and a liquid chamber communicating with said liquid path means and containing the liquid supplied to said liquid path means, the apparatus further comprises an air vent path formed in a member defining the liquid jet section and used to extract air from said liquid chamber, the air vent path has an inlet opened to the liquid chamber and an outlet formed on the liquid jet section, and the air vent path is defined by a groove formed on a plate by etching, on which plate groove means defining the liquid path means is similarly formed.

Abstract: An ink jet head comprises an orifice plate constituted of a hardened film of a photosensitive resin having an orifice which extends therethrough in the direction of its thickness.