Abstract: Disclosed herein is an ink jet printer head including a substrate which includes a piezoelectric member polarized across a thickness thereof and a plate-like low-rigid member bonded to an upper surface of the piezoelectric member. The low-rigid member has a low permittivity and a rigidity lower than that of the piezoelectric member. The substrate has a plurality of grooves cut from an upper surface of the low-rigid member to a depth beyond a bonded surface between the low-rigid member and the piezoelectric member. A top plate is bonded to the upper surface of the low-rigid member so as to cover upper openings of the grooves, thereby defining a plurality of pressure chambers between the grooves and the top plate. A plurality of ink jet nozzles are provided so as to respectively communicate with the pressure chambers. A plurality of electrodes are formed on inner surfaces of the pressure chambers.

Abstract: An ink jet print head includes pressure chambers divided by side walls formed at least partially of a piezoelectric member, voltage is applied to electrodes formed on surface of side walls, and jets ink in the pressure chambers through ink jets by causing deformation of shearing strain mode to the side walls. Each one of the side walls disposed on both sides of the pressure chambers has different operating characteristics. The volume of the ink to be jetted can be changed in three ways by selectively deforming either of the side walls of the pressure chamber from which the ink is to be jetted or by deforming both of the side walls of the pressure chamber simultaneously. Accordingly, gradation can be acquired by a simply constructed print head.

Abstract: A method of fabricating an ink jet print head which jets ink through an ink jet nozzle by pressurizing the ink supplied to a pressure chamber from an ink supplying portion, including applying flowable resin on a surface of a piezoelectric member polarized along a thickness thereof; forming a low rigidity member having a rigidity less than that of the piezoelectric member by curing the resin; grinding a surface of the low rigidity member; forming a plurality of grooves extending from the surface of the low rigidity member to an inside of the piezoelectric member; forming electrodes on the entire inner surface of the grooves; and sticking a top plate on the ground surface to close an opening of the grooves, thereby forming a plurality of pressure chambers communicating with an ink supplying portion and the ink jet nozzle. Since the low rigidity member is cured before it is ground, the proportion of the height of the low rigidity member and the piezoelectric member is equalized.

Abstract: An ink jet print head comprises a piezoelectric plate (2) formed of a piezoelectric material, a base plate (1) formed of a nonconductive, nonelectrostrictive material having rigidity lower than that of the piezoelectric material and joined to the piezoelectric plate (2), electrodes (8) formed by depositing a metal by electroless plating over the entire bottom surfaces of a plurality of parallel grooves (3) formed through the piezoelectric plate (2) into the base plate (1) and the entire side surfaces of side walls (4) each consisting of an upper side wall (4a) formed in the piezoelectric plate (2) and lower side wall (4b) formed in the base plate (2) between the grooves (3), a top plate (10) joined to the upper surface of the piezoelectric plate (2) so as to close the upper open ends of the grooves (3) to form pressure chambers (14), and a nozzle plate (12) provided with ink jets (11) and joined to one end of the assembly of the base plate (1), the piezoelectric plate (2) and the top plate (10) so that the in

Abstract: An adhesive layer 15 is formed over one major surface of a flat base plate 1 having a relatively high rigidity, a piezoelectric plate 2 is joined to the adhesive layer 15, a plurality of parallel grooves 3 are formed through the piezoelectric plate 2 into the adhesive layer 15, a metal is deposited over the surfaces of the grooves 3 to form electrodes 8, a top plate 10 is attached to the upper surface of the piezoelectric plate 2 so as to close the upper open ends of the grooves 3, and a nozzle plate 12 provided with a plurality of ink jets is attached to one end of the assembly of the base plate 1, the adhesive layer 15, the piezoelectric plate 2 and the top plate 10 so as to close the open longitudinal ends of the grooves 3 to form a plurality of pressure chambers 14.

Abstract: An adhesive layer 15 is formed over one major surface of a flat base plate 1 having a relatively high rigidity, a piezoelectric plate 2 is joined to the adhesive layer 15, a plurality of parallel grooves 3 are formed through the piezoelectric plate 2 into the adhesive layer 15, a metal is deposited over the surfaces of the grooves 3 to form electrodes 8, a top plate 10 is attached to the upper surface of the piezoelectric plate 2 so as to close the upper open ends of the grooves 3, and a nozzle plate 12 provided with a plurality of ink jets is attached to one end of the assembly of the base plate 1, the adhesive layer 15, the piezoelectric plate 2 and the top plate 10 so as to close the open longitudinal ends of the grooves 3 to form a plurality of pressure chambers 14.

Abstract: An ink jet print head comprises a piezoelectric plate (2) formed of a piezoelectric material, a base plate (1) formed of a nonconductive, nonelectrostrictive material having rigidity lower than that of the piezoelectric material and joined to the piezoelectric plate (2), electrodes (8) formed by depositing a metal by electroless plating over the entire bottom surfaces of a plurality of parallel grooves (3) formed through the piezoelectric plate (2) into the base plate (1) and the entire side surfaces of side walls (4) each consisting of an upper side wall (4a) formed in the piezoelectric plate (2) and lower side wall (4b) formed in the base plate (2) between the grooves (3), a top plate (10) joined to the upper surface of the piezoelectric plate (2) so as to close the upper open ends of the grooves (3) to form pressure chambers (14), and a nozzle plate (12) provided with ink jets (11) and joined to one end of the assembly of the base plate (1), the piezoelectric plate (2) and the top plate (10) so that the in

Abstract: A method of producing a printer head wherein a substrate including at least one piezoelectric member polarized in its thickness direction is formed. A plurality of grooves and a plurality of posts are alternately defined in the substrate. A pre-processing solution is allowed to flow along the grooves at the following relative velocity so as to effect pre-processing when the velocity of the pre-processing solution for electroless plating relative to an object to be plated is V, the height of each of electrodes formed on the internal surfaces of the grooves is H, the width of each groove is W and a contact angle at which the pre-processing solution is brought into contact with the internal surfaces of the grooves is .theta..VW.sup.2 (1+cos.theta. )/H.sup.2 >0.6 mm/sThereafter, the substrate is immersed in an electroless plating solution to form the electrodes.

Abstract: A dot print head comprising a yoke, a plurality of cores formed integrally with the yoke in an annular arrangement in the peripheral portion of the yoke, solenoid coils wound respectively around the cores, armatures fixedly provided respectively with styluses, an armature support supporting each armature at the middle portion thereof opposite to the corresponding core for swing motion, and an armature holding member disposed opposite to the yoke with a predetermined gap therebetween to hold the armatures on the armature support for swing motion. A plurality of joining parts are formed on the yoke on a line on which the cores are arranged, and a plurality of joining parts are formed on the armature holding member so as to be joined respectively to the connecting parts of the yoke in joining together the yoke and the armature holding member.

Abstract: A release type dot print head employing cores formed of a difficult-to-machine magnetic alloy containing iron and cobalt as the principal components and having a high saturation magnetic flux density. The cores are fabricated easily by processing plates of the magnetic alloy in a simple shape and are combined respectively with auxiliary cores formed of an easily workable material. Thus, the principal components of the release type dot print head can be easily fabricated and assembled.

Abstract: A dot printer head in which each radially directed armature is urged to pivot about its primary fulcrum in the return direction by a metallic return spring and is urged to pivot in the opposite angular direction by a metallic holding spring. The metallic return springs and metallic holding springs are sized and positioned so that the metallic holding springs exert a torque urging the radially directed armature to pivot in the actuating direction that is lower than the torque urging the armatures to pivot in the return direction.

Abstract: A dot printer head in which a radial array of armatures are disposed opposite to a yoke and cores equipped with coils, and the armatures are actuated together with needles by exciting the coils to perform a desired printing operation. In this arrangement, a magnetic flux generated from each core flows to the yoke via the associated armature and then returns to the former core while partially flowing through another magnetic path by way of the adjacent armature to the yoke and returning to the former core, whereby required magnetic paths are obtained without the necessity of increasing the areas of the mutually opposed surfaces of the armature and the yoke. Thus, the radial width of the yoke is reduced as well as the distance from the fulcrum of the armature to the core, so that the distance from the fulcrum of the armature to the fore end thereof can be sufficiently lengthened against the distance from the armature fulcrum to the core.

Abstract: The present invention provides a dot printer head which includes a plurality of cores each having a mounting portion which is contacted with a core holding face of a permanent magnet and a post-like projection for mounting an electromagnetic coil thereon. The height of the mounting portion is made relatively small while the area of the mounting portion is made larger than the area of the cross section of the post-like projection. Due to this arrangement, sufficient magnetic fluxes are provided to the cores and magnetic interference between adjacent cores is reduced.