A liquid ejecting apparatus includes a print head, in which the print head includes a substrate having first, second, third and fourth sides, a first surface, a second surface, a connector, a first integrated circuit, and a second integrated circuit, the connector includes a first end with a shortest distance to the third side and a second end with a shortest distance to the fourth side and is provided on the first surface so that a plurality of terminals are arranged along the first side, the first integrated circuit is provided on the second surface, a shortest distance between the first end and the first integrated circuit is shorter than a shortest distance between the second end and the first integrated circuit, and a shortest distance between the second end and the second integrated circuit is shorter than a shortest distance between the first end and the second integrated circuit.

There is provided a liquid discharge apparatus including: a discharge section; a first wiring for transmitting a setting information signal group that has a first setting information signal and a second setting information signal and a discharge control signal group; and a second wiring for transmitting a driving signal, in which the apparatus is configured to be operated in a first print mode in which printing is performed with a first gradation number according to the setting information signal group, and in a second print mode in which printing is performed with a second gradation number smaller than the first gradation number, and in the second print mode, the droplets are discharged from the discharge section according to the first setting information signal and the second setting information signal in which bit data of the first setting information signal is inverted.

A liquid ejecting apparatus includes a print head, a digital signal output circuit, and a liquid accommodating container, in which the print head includes a supply port to which the liquid is supplied from the liquid accommodating container, a nozzle plate having a plurality of nozzles that eject the liquid, a substrate that has a first surface and a second surface different from the first surface, a connector to which the digital signal is input, an integrated circuit to which the digital signal is input via the connector and that outputs an abnormality detection signal indicating presence or absence of an abnormality in the print head, and a first capacitor electrically coupled to the integrated circuit, the connector and the first capacitor are provided on the first surface, and the integrated circuit is provided on the second surface.

A liquid ejecting apparatus includes a plurality of ejecting unit groups each including nozzles configured to eject liquid. The ejecting unit group configured to eject a liquid to be used in the printing is referred to as a to-be-used ejecting unit group. The ejecting unit group configured to eject a liquid not to be used in the printing is referred to as the non-use ejecting unit group. In a print mode with a non-use nozzle group in which any of the plurality of kinds of liquids is not used, the driving elements of the to-be-used ejecting unit group is supplied with the in-printing micro-vibration pulse in a period without ejection of the ink, and the driving elements of the non-use ejecting unit group is not supplied with the micro-vibration pulse even in the period without ejection of the ink.

A method of removing printing fluid puddles from an exterior nozzle surface of an inkjet printhead includes selectively applying a suction signal for a first time period to a plurality of actuators associated with fluid channels of corresponding nozzles by a control module. The method also includes moving printing fluid within the fluid channels associated with the actuators in response to application of the suction signal. Additionally, the method also includes creating suction in each one of the associated fluid channels and through the corresponding nozzles to remove the printing fluid puddles from the exterior nozzle surface by pulling the printing fluid puddles through the corresponding nozzles and the associated fluid channels in response to movement of the printing fluid within the fluid channels.

The invention relates to a printing method for a digital printing device, comprising a print head having a plurality of printing systems and comprising at least one control apparatus for feeding control signals to the printing systems for the production of ink drops. Each printing system has a nozzle, at least one ink chamber and an activator, e.g. a piezoelectric activator, which is associated with the at least one ink chamber, for the discharge of ink drops from the ink chamber in question via the nozzle in question onto a substrate to be printed on, as a response to a control signal. In the control apparatus, only a single waveform for the control signal having a specified time curve is stored for ink drops of all sizes, comprising, for example, optionally an initial waiting time, a first edge, followed by a first holding time, and, after the first holding time, a second, opposite edge, optionally followed by a second holding time. The size and/or speed of ink drops is varied by virtue of the fact that, at most for a single, intrinsic drop size, the entire stored waveform is transferred as a control signal to the activator in question, while for all other, effective drop sizes, only part of the common, stored waveform is transferred to the activator in question, namely one or more selected portions, while one or more other portions of the stored, common waveform are not supplied to the activator in question in the control signal.

A liquid ejecting apparatus includes a wiring substrate; and a liquid ejecting head, in which the liquid ejecting head includes a plurality of electrodes, an ejecting unit, and a non-ejecting unit, the wiring substrate is connected to the plurality of electrodes, the ejecting unit includes a driven element which is displaced due to a signal waveform applied to an electrode which is provided so as to correspond to at least one of the plurality of electrodes, a pressure chamber, and nozzles, the non-ejecting unit is provided so as to correspond to at least another electrode among the plurality of electrodes, and does not include at least one of the nozzle, the driven element, and the pressure chamber, and the signal waveform which is applied to an electrode which corresponds to the non-ejecting unit is designated by a dummy signal in the printing data.

An electrical circuit for measuring the shape of a voltage waveform in a print head of a printer includes an integrated circuit for generating one or more voltage amplitude waveforms. The electrical circuit includes an inkjet drop forming unit including a plurality of inkjet chambers, wherein each of the plurality of inkjet chambers includes a piezoelectric actuator and an ink nozzle, and a connecting circuit between the integrated circuit and the inkjet drop forming unit suitable for applying one of the one or more voltage amplitude waveforms generated by the integrated circuit to the piezoelectric actuator in one of the plurality of inkjet chambers. In order to measure the shape of the one or more generated voltage amplitude waveforms via capacitive crosstalk, the electrical circuit also includes a conductor in physical proximity to the connecting circuit.

An inkjet head drive apparatus comprises a pressure chamber, an actuator, a nozzle and a drive signal output section. The pressure chamber accommodates an ink. The actuator increases or decreases volume of the pressure chamber through an applied a voltage. The nozzle is connected with the pressure chamber to eject the ink through the change in the volume of the pressure chamber. When an ejection pulse for the ejection of the ink from the nozzle is repeated for equal to or greater than three times, the drive signal output section outputs a drive signal having a driving waveform including an initial ejection pulse having a first voltage amplitude and the a second ejection pulses and the pulses thereafter having a second voltage amplitude smaller than the first voltage amplitude to the actuator.

Systems and method of maintaining a uniform temperature distribution in an inkjet head. The inkjet head includes a plurality of ink channels that jet droplets of a liquid material onto a medium using piezoelectric actuators. A temperature controller includes a non-jetting pulse generator that provides non-jetting pulses to one or more of the piezoelectric actuators to generate heat. The non-jetting pulses cause the the piezoelectric actuators to actuate without jetting a droplet from its corresponding ink channel.