摘要:
The chambers (42) and each corresponding ink feeding duct (56), made in a structural layer of photosensitive resin (38), are delimited by a flat bottom wall (36) made of a protective layer (34, 36) of tantalum and gold and an upper wall (44), consisting of a substantially concave surface, including at least one ejection nozzle (46) and joined to the bottom wall along a continuous perimetral line (52), in which the inner shape of each of the chambers (42) and of each of the feeding ducts (56) represents the complementary impression of the outer form of a sacrificial layer (57), obtained from a controlled and non-contained growth of a metal, deposited starting from the dimensions of the layer of gold (36), laid on top of the layer of tantalum (34).
摘要:
A process for manufacturing a monolithic thermal ink jet printhead (40) comprising a plurality of chambers (74) and of nozzles (56), comprises steps of (206) depositing a plurality of sacrificial layers (31), of obtaining, by means of exposure and development operations, a plurality of casts (156), of (215) applying a structural layer (107), and subsequently steps of (225) removing the casts (156) and of (226) removing the sacrificial layers (31), in order to produce a plurality of chambers (74) and nozzles (56).
摘要:
An ink jet printhead, made of a silicon substrate and a plurality of metallic and dielectric layers deposited on said substrate. A plurality of chambers for ejection of ink droplets and a plurality of corresponding feeding ducts, connected to the chambers, are produced in a structural layer made of non-photosensitive epoxy or polyamide resin. The chambers and said ducts are delimited by at least one upper wall, the upper wall communicating with at least one nozzle for ejection of the ink droplets. The upper wall and an inner wall of the nozzle are coated with at least one metallic coating layer, suitable for increasing the resistance of the walls to chemically aggressive liquids, in contact with the walls.
摘要:
The printing device (21) is ink jet, parallel or serial-parallel type and comprises a plurality of ejection modules (22) each of which with ejection chambers suitable for containing ink and with associated relative heating elements (24) for ink ejection control. The device includes a support and a nozzle plate (28) common to the modules (22), and in which the support includes a base plate (27) of rigid material that defines through its thickness a feeding duct (33) for the ink which, in use, is substantially parallel to the line of printing (X axis) and the ejection modules (22) are fixed side by side on the base plate (27) and with the ejection chambers arranged in a line in the same direction (X axis), is a hydraulic, tight connection with the feeding duct (33). The nozzle plate (28) is fixed on the ejection modules (22) constituting an upper, hydraulically tight, closing surface, for the chambers (23) and comprises a plurality of ejection nozzles (32) in a line, in turn in hydraulic connection with corresponding cells of the modules (22).
摘要:
Ink jet printhead comprising a driving and encoding circuit (20) having a grid-like structure, including a plurality of inputs (24), a plurality of selecting elements (12), a plurality of actuating elements (I1) and at least one identifying element (21) of said printhead. Each identifying element (21) is associated with a corresponding selecting element (12) and corresponds to nodes arranged along a row or column of said grid-like structure, and is scanned, together with said actuating elements (11), during a preliminary checking step.
摘要:
A substrate (10; 110; 210; 310) for an ink jet printhead comprising: at least three slots (12a, 12b, 12c) of elongated shape, oriented parallel to one another lengthwise in a vertical direction (13); three corresponding actuating banks (16a, 16b, 16c); a plurality of drive circuits (18); and a plurality of terminals (21, 21a, 21b), lesser in number than the ejection actuators (16), connected to the drive circuits (18) for receiving external signals, wherein at least two (12a, 12b) of the three slots are arranged side by side along the respective long edges in an upper portion (10a) of the substrate, and the third slot (12c) is arranged in a lower portion (10b) of the substrate, and wherein moreover the terminals (21) connected to the drive circuits are arranged in a line along the edges (11a, 11b) of the substrate (10) parallel to the slots and therefore to this given vertical direction (13). This substrate has a robust structure and is less likely to crack in the zone of the slots.
摘要:
A process for manufacturing a monolithic thermal ink jet printhead (40) comprising a plurality of chambers (74) and of nozzles (56), comprises steps of (206) depositing a plurality of sacrificial layers (31), of obtaining, by means of exposure and development operations, a plurality of casts (156), of (215) applying a structural layer (107), and subsequently steps of (225) removing the casts (156) and of (226) removing the sacrificial layers (31), in order to produce a plurality of chambers (74) and nozzles (56).
摘要:
The composite printhead (1) is made up of an active module (7), consisting of a thin plate (8) of silicon, on which a plurality of chambers (14) is produced, housing corresponding heating resistors (10), electrically connected through an interconnection network to corresponding external contact pads (37, 42), and of a support element (3) for the active module, in turn consisting of a portion of plate (22) of a rigid, insulating material, provided with an elongated slot shape, ink feeding duct (5), traversing the thickness of the support element (3). The active module (7) is built separately from the support element (3) and later mounted integrally upon the support element (3). Also mounted later to the support (3) is a frame (16) surrounding the active module (7) to provide hydraulic sealing. Finally the module (7) and the frame (16) are covered with a metallic or resin lamina (17), bearing an array of nozzles (18) aligned with and facing the ejection chambers (14).
摘要:
The apparatus for manufacturing the ink jet glass tubes includes a vertical mandrel which receives the tubes one at a time from a feeder and rotates them relative to a pair of gas nozzles for their heating. The tube is heated in an axially limited intermediary zone so as to form an hour-glass shaped profile.The profile of the tube is scanned by a television camera which generates two signals indicative of the internal diameter. These are compared electronically with a stored indication of the desired diameter and the two nozzles are rotated into an inactive position when this diameter is reached. The tube is cut along a plane so as to make the profile of the nozzle coincident with a reference profile by a device including an optical device connected to a cutting wheel to permit comparison of the hour-glass profile of the element with the reference profile. The severed end of the tube is then lapped and covered with a non-wettable material. The tubular element is bonded within a piezo-electric transducer, by locating the latter partially in a chamber, after fitting it over the tubular element, while a pump draws an epoxy resin through the chamber and into the space between the transducer and the tubular element.
摘要:
The printing device (21) is ink jet, parallel or serial-parallel type and comprises a plurality of ejection modules (22) each of which with ejection chambers suitable for containing ink and with associated relative heating elements (24) for ink ejection control. The device includes a support and a nozzle plate (28) common to the modules (22), and in which the support includes a base plate (27) of rigid material that defines through its thickness a feeding duct (33) for the ink which, in use, is substantially parallel to the line of printing (X axis) and the ejection modules (22) are fixed side by side on the base plate (27) and with the ejection chambers arranged in a line in the same direction (X axis), is a hydraulic, tight connection with the feeding duct (33). The nozzle plate (28) is fixed on the ejection modules (22) constituting an upper, hydraulically tight, closing surface, for the chambers (23) and comprises a plurality of ejection nozzles (32) in a line, in turn in hydraulic connection with corresponding cells of the modules (22).