A liquid droplet ejecting apparatus includes a liquid droplet ejecting head that includes a plurality of nozzles from which a liquid supplied from a liquid supply source through a liquid supply path is ejected as a liquid droplet, and ejects the liquid droplet from the nozzle to a recording medium to perform a recording process, a first detecting section that detects a vibration waveform of the pressure chamber, which is vibrated when an actuator is driven to cause the pressure chamber communicating with the nozzle to vibrate, to detect a state inside the pressure chamber, and a second detecting section that reads a pattern formed on the recording medium by ejecting the liquid droplet from the nozzle to detect an ejection state of the liquid droplet.

There is provided a liquid discharging apparatus including a liquid discharge head, a tank, and a controller configured to perform: estimating an amount of liquid remained in the tank; estimating a viscosity of the remained liquid; estimating an amount of the refilled liquid; estimating a viscosity of the refilled liquid; and estimating a viscosity of a mixed liquid of the remained liquid and the refilled liquid at a point of time of finishing a refill of the tank with the liquid, based on the estimated amount of the remained liquid, the estimated viscosity of the remained liquid, the estimated amount of the refilled liquid, and the estimated viscosity of the refilled liquid.

Internal data contributing to trouble resolving is easily acquired, and usability is improved. An inkjet recording device includes an operating state acquisition unit that acquires parameter values indicating an operating state of the inkjet recording device, which includes at least one a pressurization state, a charge state, a deflection state, and a recovery state, a display unit that displays a reception screen for receiving a command to generate a two-dimensional code from a user, and a code generation unit that generates the two-dimensional code by encoding a parameter value constituting a parameter set of a predefined type among the parameter values acquired by the operating state acquisition unit when the generation command is received via the reception screen of the display unit. The display unit is configured to display the two-dimensional code generated by the code generation unit.

An inkjet printing apparatus includes a printing unit having ejection parts, each configured to eject ink by using a piezoelectric element to be displaced in response to a change in electric potential. The inkjet printing apparatus also includes a circulation unit, a determination unit, and a control unit. The circulation unit executes ink circulation in a circulation path inclusive of the printing unit. The determination unit ejects the ink from each ejection part, detects residual vibration generated at an ejection part due to ink ejection, and determines an ejection state of ink ejection at the ejection part based on the detected residual vibration. The inkjet printing apparatus determines a printing state of ink ejection in the printing unit based on the ejection state. The control unit causes the determination unit not to make the ejection state determination in parallel with causing the circulation unit to execute the ink circulation.

A maintenance method for a liquid discharging apparatus including a discharging portion that discharges liquid, the maintenance method includes acquiring first viscosity information related to viscosity of the liquid inside the discharging portion, discharging a first amount of the liquid from the discharging portion, acquiring second viscosity information related to viscosity of the liquid inside the discharging portion, and discharging a second amount of the liquid based on the first viscosity information and the second viscosity information, from the discharging portion.

A fluidic dispensing device includes a fluid reservoir containing fluid. A stir bar is located in the fluid reservoir and has a magnet. A generator generates a rotating magnetic field to interact with the magnet. A controller determines a range of a predetermined phase lag between an angular rotational position of the stir bar and an angular rotational position of the rotating magnetic field, determines a status of a present phase lag based on the range of the predetermined phase lag, and takes predetermined action based on the status.

A fluidic dispensing device includes a fluid reservoir containing fluid. A stir bar is located in the fluid reservoir and has a magnet. A generator generates a rotating magnetic field to interact with the magnet. A controller determines a range of a predetermined phase lag between an angular rotational position of the stir bar and an angular rotational position of the rotating magnetic field, determines a status of a present phase lag based on the range of the predetermined phase lag, and takes predetermined action based on the status.

In some examples, a cartridge includes a printhead comprising a fluid feed slot, a fluid chamber formed between a nozzle layer and a passivation layer, the fluid chamber fluidically coupling the fluid feed slot and a nozzle of the nozzle layer, and a printhead-integrated sensor to sense a property of a fluid in the fluid chamber, the sensor including a ground electrode exposed to the fluid chamber through an opening in the passivation layer.

An example provides a fluid ejection device including a fluid feed slot, a fluid chamber between a nozzle layer and a passivation layer, and a printhead-integrated sensor to sense a property of a fluid in the fluid chamber. The sensor may include a ground electrode exposed to the fluid chamber through a via in the passivation layer.

Methods for ejecting fluids having a viscosity ranging from about 20 mPa-sec to about 100 mPa-sec at 22 C. from a micro-fluid ejection head. The methods include the steps of applying a heat signal to the ejection head for a first period of time to heat the ejection head to a first temperature that is about 20 C. above a steady state fluid ejection temperature for continuous or intermittent fluid ejection from the ejection head; and subsequently, applying a firing signal to ejection heaters on the ejection head during which fluid ejection from the ejection head occurs.