Abstract: An orifice plate for a jet drop recorder is fabricated by plating techniques. It is formed throughout of a single, homogenous material, such as nickel, for compatibility with the recorder ink, and is of sufficient thickness to provide adequate strength. The orifices are open on both sides for easy cleaning.

Abstract: A planar charge plate having individual charge electrodes uniformly spaced along one face thereof is provided by cutting grooves into the edge of a blank nonconductive charge plate support structure. The surfaces of the structure, including grooves and lands, are metallized and printed circuit leads are formed leading from the grooves. The grooves are filled with an electrically conductive material such as solder, and then the front face of the structure is lapped to remove excess solder and metal plating from the lands to form the completed planar-faced structure.

Abstract: An ink jet printing head (10) is provided for use in an ink jet printing device, having an ink supply reservoir (14) formed in a manifold (12) for supplying ink to a plurality of orifices (16) formed in rows in an orifice plate (18) extending longitudinally along the bottom of the manifold (12) and forming the lower part of the reservoir (14) through which a plurality of droplets of fluid can be expelled under pressure. In one embodiment, the upper surface of the reservoir (14) is closed by a vibrationally flexible and magnetically active diaphragm plate (32) having its lower surface in contact with the upper surface of the liquid in the reservoir (14). An electromagnetic device is provided having a portion (40) coupled to the diaphragm (32) to form a magnetic flux path therethrough and another portion (38) positioned adjacent and above the diaphragm (32) so that that portion (38) and the diaphragm (32) form opposite poles of the electromagnet.

Abstract: An orifice plate for a jet drop recorder is fabricated by plating techniques. It is formed throughout of a single, homogeneous material, such as nickel, for compatibility with the recorder ink, and is of sufficient thickness to provide adequate strength. The orifices are open on both sides for easy cleaning.

Abstract: The stimulating plate in a jet drop recording head has a central, thin, flexible portion forming a medial channel or trench. The thicker portions of the plate which surround the trench form an acoustical barrier along its sides. When the thinner medial portion of the plate is acoustically stimulated, the energy is reflected and confined within the trench independently of the bond between the stimulating plate and the jet drop recording head.