Abstract: A device for dispensing drops of a liquid is disclosed. The device comprises a liquid accelerating vessel (11) for receiving a volume of the liquid to be dispensed, a nozzle (14) which is directly mechanically connected with the liquid accelerating vessel (11), a bending element (15), having one portion (17) which is free to oscillate and driving means for causing bending oscillations of the bending element (15). The liquid accelerating vessel (11) has an inlet opening (12) and an outlet opening (13). The nozzle (14) has a passage (22) which is in fluid communication with the interior (21) of the liquid accelerating vessel (11). The driving means comprise a piezoelectric transducer (18) which is directly mechanically connected with the portion (17) of the bending element (15), which portion (17) is free to oscillate.

Abstract: A piezoelectric drive having an excitation piezoelement (10) and a resonator (2). The resonator is coupled to the piezoelement and is in interactive connection with a body (3) to be driven. The resonator (2) has a mass distribution that is designed such that, as a result of an excitation oscillation by the piezoelement (10), the resonator (2) begins to asymmetrically oscillate in several directions dependent on the frequency of the excitation oscillation. The asymmetric oscillations, via the interactive connection, displace the body to be driven into a directed movement.

Abstract: The invention relates to a piezoelectric drive (1). This comprises an excitation piezoelement (10) and a resonator (2) which is coupled to this and which is in interactive connection with a body (3) to be driven. The resonator (2) has a mass distribution which is designed in a manner such that as a result of an excitation oscillation by the piezoelement (10), the resonator (2) begins to asymmetrically oscillate in several directions dependent on the frequency of the excitation oscillation, and these oscillations via the interactive connection displace the body to be driven into a directed movement.

Abstract: A print head for an ink-jet printer has a nozzle member defining a plurality of ink channels arranged side-by-side and each terminating in a nozzle. A plurality of actuators are disposed on one side of the nozzle member and respectively face one of the ink channels for pressurizing the ink liquid therein, in order to expel ink droplets through the nozzles. A support for supporting the actuators on the side opposite to the ink channels is provided and a plurality of connecting portions mechanically connect the support to the nozzle member. At least one of the connecting portions is arranged between the actuators. The connecting portions are spaced apart from one another in a longitudinal direction of the ink channels and are formed, for example, by bars extending transversely to the ink channels.

Abstract: An inkjet array for a printer includes a number of elements. Each element has an ink chamber and an ink provider, and a piezo-actuator rigidly secured to one side of the ink chamber. The ink chamber is brought into motion in response to an image signal whereby an ink droplet is ejected from a nozzle of the ink chamber. Each of the ink chambers of the array can be brought into motion separately.

Abstract: An inkjet array provided with a piezoelectric member and a member in the form of a plate opposite the piezoelectric member, the plate member having a surface which faces the piezoelectric member provided with a number of parallel elongated ink ducts, while the piezoelectric member is provided with a number of elongated parallel piezoelectric elements substantially rectangular in cross-section, each piezoelectric element being situated opposite an ink duct, the piezoelectric member being received in a recess in a baseplate which abuts the ink duct surface of the plate member containing the ink ducts, and which is fixed to the plate member.

Abstract: A rotary mirror system for angularly deflecting a light beam including an air bearing arrangement rotatably supporting a mirror body on which one or more mirror facets are provided, the mirror body being the rotor of an electric motor, wherein the mirror facets are the side surfaces of an internal pyramid or frusto-pyramid formed in and opening towards one axial end surface of the mirror body and having an axis of symmetry coinciding with the rotational axis (A) of the mirror body, the orientation of the mirror facets, relative to the incoming light beam, being such that the reflected beam leaves the internal pyramid at an inclined angle with respect to the rotational axis (A).

Abstract: A stackable drop generator for an ink-jet printer made up of a number of stackable elements in the form of flat plates, each plate comprising a pressure chamber, a supply chamber and a piezo-element for forming a pressure wave in the ink in the pressure chamber, and in which elements are so disposed on either side of a first or intermediate element such that the pressure chambers of the elements are not in line with the pressure chamber of the intermediate element.

Abstract: A device for holding, adjusting and driving a rotatable body such as a polygonal mirror or a polygonal mirror firmly attached to a bushing is disclosed. The rotatable body has a central bore which encloses an axis of rotation and is provided with a means for connecting the rotatable body to the axis of rotation. The means for connecting the rotatable body to the axis of rotation comprises a first fastening zone wherein the rotatable body is rigidly connected to the axis of rotation by an interference fit and a second fastening zone located at a distance from the first fastening zone on the axis of rotation, wherein set screws spaced at regular intervals over the circumference of the rotatable body and are used to position the rotatable body relative to the axis of rotation. Preferably, the central bore of the rotatable body in the area of overlap has a diameter larger than the diameter of the axis of rotation contained therein other than in the first fastening zone.

Abstract: A printing device for recording information in the form of toner images comprising a moveable image-forming medium on a support, the surface of which forms a dielectric layer; an image-forming station disposed along the trajectory of the image-forming medium having a magnetic roller with an electrically conductive nonmagnetic outer sleeve with magnets disposed inside the sleeve; a means for supplying electrically conductive toner particles to a linear zone in the image-forming station; and a plurality of electrodes for generating an electric field corresponding to a desired image pattern, said electrodes extending in the direction of movement of the image-forming medium and disposed so as to be insulated from one another and covered by a dielectric layer wherein each electrode can be actuated by a voltage source and each electrode can generate an electric field across the dielectric layer over part of the zone wherein image formation takes place when in the image-forming station.

Abstract: A polygonal mirror is provided which presents a plurality of mirror surfaces arranged about an axis of rotation with all the mirror surfaces at the same inclination relative to that axis. The mirror comprises a reflecting foil tightened over a plurality of supporting elements arranged about the axis of rotation. Equal angles between the mirror surfaces are obtained by employing cylinders as the supporting elements. The cylinders all have the same outside diameter, and are placed together with each touching two neighboring cylinders and each in contact with a central cylinder the axis of which coincides with the axis of rotation.