A print head drive circuit drives a print head including an ejecting portion ejecting a liquid in response to a drive signal propagating through a drive signal line and a storage portion storing ejecting portion-related information changing in accordance with use of the ejecting portion, in which processing of reading the ejecting portion-related information changing in accordance with the use from the storage portion is performed before the drive signal for ejecting the liquid from the ejecting portion is supplied to the print head.

An inkjet head driving method includes applying a voltage signal having a combined drive waveform that includes unit drive waveforms to a pressure generator and causing a nozzle to jet ink droplets such that the droplets land on a medium as one droplet. Each unit drive waveform includes a first pulse waveform for jetting a droplet and a second pulse waveform for pulling back the jetted droplet. The first and second pulse waveforms each include an expansion part for expanding a pressure chamber and a following contraction part for contracting the chamber. The combined drive waveform includes a first unit drive waveform and a following second unit drive waveform. A voltage amplitude of the contraction part of the second pulse waveform in the second unit waveform is greater than that of the contraction part of the second pulse waveform in the first unit drive waveform.

a first sloped portion that is provided between the first wall surface and the third wall surface includes a first constituting surface that extends in a third direction between the first direction and the second direction.

A printing apparatus includes a medium accommodation portion that accommodates a medium, a medium discharge port for discharging the medium, a medium transport section that transports the medium, an ejection head that ejects a liquid to the medium to form an image, and an image detection section that detects the image. The printing apparatus has a first mode and a second mode, the first mode being a mode in which the medium transport section transports the medium in a direction from the medium accommodation portion toward the medium discharge port, and the ejection head ejects the liquid to the medium, and the second mode being a mode in which the medium transport section transports the medium in a direction from the medium discharge port toward the medium accommodation portion, and the image detection section detects image information of the image formed on the medium.

A control method of a liquid discharging apparatus includes: a discharge inspection step of inspecting discharge abnormality of a nozzle by a discharge inspection mechanism; a remaining oscillation inspection step of inspecting oscillation of the ink inside a pressure chamber by a oscillation inspection circuit when the discharge abnormality is detected; a first correction step of performing correction which corresponds to the attachment of the resin inside the pressure chamber with respect to the driving pulse when abnormality is detected in oscillation; a re-discharge inspection step of inspecting the discharge abnormality of the nozzle after the first correction step; and a second correction step of performing the correction which corresponds to the attachment of the resin inside the nozzle with respect to the driving pulse when the abnormality is not detected in the oscillation in the oscillation inspection step or when the discharge abnormality is detected in the re-discharge inspection step.

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 piezoelectric actuators to actuate without jetting a droplet from its corresponding ink channel.

A jetting device includes an ejection unit arranged to eject a droplet of a liquid. The ejection unit includes a nozzle, a liquid duct connected to the nozzle, and an electro-mechanical transducer arranged to create an acoustic pressure wave in the liquid in the duct. The jetting device further includes a filter arranged to filter the liquid being supplied into the duct and a filter status detection system arranged to detect an obstruction status of the filter by measuring a property of the liquid in the duct. The filter status detection system includes a circuit configured for measuring the electric response of the transducer, for recording changes in the electric response that represent pressure fluctuations induced by the acoustic wave in the form of a time-dependent function, and for judging the obstruction status of the filter on the basis of that function.

A liquid ejecting apparatus includes an ejecting unit and a drive circuit that generates the drive signal in accordance with a first voltage and a second voltage. The drive circuit includes a first pair of transistors, a second pair of transistors, and an integrated circuit that includes a first terminal to which the first voltage is applied, a second terminal to which the second voltage is applied, a first output terminal group which outputs a first control signal group for controlling the first pair of transistors, and a second output terminal group which outputs a second control signal group for controlling the second pair of transistors. The first terminal, the second terminal, the first output terminal group, and the second output terminal group are arranged along one side of the integrated circuit. The second output terminal group is disposed between the first terminal and the second terminal.

A liquid discharging apparatus includes a head unit which includes a discharge unit which discharges a liquid, a controller which controls discharging of the liquid, a plurality of first signal lines which connect the controller to the head unit, and at least one second signal line which connects the controller to the head unit, in which, the controller transmits the differential signal to the head unit via the first signal lines, and in which the head unit transmits the state signal in analog format to the controller via the second signal line.

A repeatable manufacturing process uses a printer to deposits liquid for each product carried by a substrate to form respective thin films. The liquid is dried, cured or otherwise processed to form from the liquid a permanent layer of each respective product. To perform printing, each newly-introduced substrate is roughly mechanically aligned, with an optical system detecting sub-millimeter misalignment, and with software correcting for misalignment. Rendering of adjusted data is performed such that nozzles are variously assigned dependent on misalignment to deposit droplets in a regulated manner, to ensure precise deposition of liquid for each given area of the substrate. For example, applied to the manufacture of flat panel displays, software ensures that exactly the right amount of liquid is deposited for each “pixel” of the display, to minimize likelihood of visible discrepancies in the resultant display.