A printhead driving method in a power source device to output a printhead driving voltage, for generating an optimum voltage for a characteristic of the printhead attached to a printing apparatus, without controlling an output voltage with high accuracy. The printhead is provided with a reference voltage source to set an output voltage of a head driving power source. A head driving power circuit incorporated in the printing apparatus compares a value obtained by dividing the reference voltage wi...

A printhead module for a printhead assembly is provided as a unitary arrangement of a support member, at least two printhead integrated circuits, each of which has nozzles formed therein for delivering printing fluid onto the surface of print media, at least one fluid distribution member mounting the at least two printhead integrated circuits to the support member, and an electrical connector for connecting electrical signals to the at least two printhead integrated circuits. The support member ...

A circuit board holds a line of light emitting elements mounted thereon. The light emitting elements are at a predetermined height from the surface of the circuit board. A rod lens array longitudinally extends and forms images of the light emitting elements on a photoconductive body such that the images and the light emitting elements form pairs of conjugate points with respect to the rod lens array. A holder holds the rod lens array relative to the light emitting elements. Supporting members ar...

A semiconductor chip controls an A x B matrix of heaters in a thermal printhead in accordance with a digital code stored in a buffer register. A logic array gated to the register is programmed selectively to enable A control lines leading to columns of heaters. A counter sequentially enables B control lines leading to rows of heaters. Control logic is responsive to a function code to initiate a printing operation in which a counter operates in response to a condition in the control logic to immo...

A printhead assembly with a replaceable stylus insert provides for compact connection of contact pads by staggering the contact pads an offset distance that is significantly less than the pad dimension in the direction of offsetting. Preferably the offsets are symmetrically arranged about a reference line and connections are coordinated relative to the reference line so that conductor overlaps are avoided. A compressable means applies pressure to urge the contact pad into intimate engagement and...

A magnetic print module for use as a printhead of a magnetic printing system. The print module comprises a base having a matrix of integral protrusions extending upward from the base and a plurality of coils wrapped around the base between the rows and columns of the matrix. By selectively energizing four coils at a time, a current path may be formed around one of the protrusions, which induces a magnetic field in the protrusion and permits it to print a dot in a recording medium. In order to fo...

A thermal printhead is disclosed which prevents an undesired color from being generated around the periphery of a desired color, even when a two-color thermo-sensitive paper is used as the recording medium. A plurality of variable electric potential regions are formed on top of a heating resistor. Each region is disposed between two adjacent projections, and has an individual electrode that intersects therewith. The variable electric potential regions generate colors due to electric potential di...

A method of fabricating a printhead chip for an ink jet printhead includes forming a drive circuitry layer on a wafer substrate. A first sacrificial layer is deposited on the drive circuitry layer. The first sacrificial layer is etched to form a deposit area for an actuator layer. Actuator material is deposited on the first sacrificial layer to form the actuator layer. The actuator layer is etched to define an actuator and a first part of nozzle chamber walls of each of a plurality of nozzle ass...

An inkjet printing device is arranged to employ a first set of multiple nozzle drop generators activated by a first address signal and a second set of multiple nozzle drop generators activated by a second address signal. The multiple nozzles of each drop generator of the first set are arranged in a predetermined geometric pattern, each of which encompasses at least one nozzle of a drop generator of the second set. The ink ejectors of one drop generator of the first drop generator set are arrange...

This invention relates to an integrated printhead (20) for ink jet printers, wherein the addressing of the various nozzles is effected in at least 3-D mode. The head (20) comprises a plurality of groups (24) of ink jet elements (21, 22) arranged in M rows and L columns wherein, in particular, the selection and activation of the different columns L are performed, under the control of an external drive circuit, by means of logic circuits (25) inside the head itself (20). The head (20) is advantage...