An image forming apparatus includes a housing heater, recording heads, a head heater, a head temperature sensor and a controller. The housing heater heats an inside of a housing. The recording heads are stored in the housing and provided for colors of ink. The head heater is provided for each of the recording heads and heats the ink stored in each of the recording heads. The head temperature sensor detects a temperature of each of the recording heads. The controller drives the housing heater until a temperature of the ink estimated based on a detection result of the head temperature sensor reaches a printing permission temperature, and controls a driving of the head heater so as to maintain the printing permission temperature after the temperature of the ink reaches the printing permission temperature.

An element substrate, according to an embodiment of this present invention, capable of detecting the behavior of a liquid at a high sensitivity, comprises: a first electrothermal transducer configured to generate heat to discharge a liquid; at least one temperature detection element arranged near the first electrothermal transducer; and a second electrothermal transducer configured to generate heat in association with a temperature detection operation by the at least one temperature detection element.

A system comprises a printhead including a nozzle, a temperature sensor and a processor. The temperature sensor detects the temperature of a location of a print surface upon firing the nozzle to eject a drop of printing fluid to the location of the print surface. The processor determines whether the nozzle ejected the drop properly using the detected temperature.

An integrated circuit to drive a plurality of fluid actuation devices includes an interface, a digital circuit, an analog circuit, and control logic. The digital circuit outputs a digital signal to the interface. The analog circuit outputs an analog signal to the interface. The control logic activates the digital circuit or the analog circuit.

A memory circuit for a print component including a plurality of I/O pads, including an analog pad, to connect to a plurality of signal paths which communicate operating signals to the print component. The memory circuit includes a controllable selector connected in line with one of the signal paths via the I/O pads, the selector controllable to disconnect the corresponding signal path to the print component, and a memory component to store memory values associated with the print component. A control circuit, in response to a sequence of operating signals received by the I/O pads representing a memory read, to operate the controllable selector to disconnect the signal path to the print component to block the memory read of the print component, and provide an analog signal to the analog pad to provide an analog electrical value at the analog pad representing stored memory values selected by the memory read.

A liquid ejecting apparatus with a recording element substrate including an ejection port that ejects liquid, and a heating element that heats the liquid in order to eject the liquid from the ejection port; and at least a first temperature detecting element and a second temperature detecting element. The first temperature detecting element and the second temperature detecting element are formed at target positions centered on the center of the heating element when the recording element substrate is viewed in plan view.

A controller 10 activates a heater 21 when a temperature detected by a temperature sensor 13 for detecting a temperature of ink becomes lower than a first reference temperature Ta lower than the appropriate ink ejection temperature Ta at the time of printing pause in which printing is paused. After the heater 21 is activated, when the temperature detected by the temperature sensor 13 exceeds a predetermined second reference temperature T2 that is higher than the first reference temperature T1 and lower than the appropriate ink ejection temperature Ta, the controller 10 moves the inkjet head to the maintenance region and forcibly discharges ink from the inkjet head in the maintenance region.

There is provided a printing apparatus including: a head having nozzles aligned in a first direction, a manifold, and a driving element; a first temperature sensor configured to detect, in the manifold, a temperature difference between a temperature of the ink at an upstream in the first direction and a temperature of the ink at a downstream in the first direction; and a controller. The nozzles have a first nozzle and a second nozzle. The controller is configured to execute: causing of the head to perform printing, and performing of position correction of correcting a discharge timing of the ink from the nozzles based on the temperature difference so that a distance between a landing position of the ink discharged from the first nozzle and a landing position of the ink discharged from the second nozzle becomes short in a second direction crossing the first direction.

A liquid discharge apparatus includes a head having a discharge part configured to discharge a liquid, and a shield member that is movable between a first position at which the shield member shields the discharge part and a second position at which the shield member exposes the discharge part in accordance with a temperature of the head.

An integrated circuit to drive a plurality of fluid actuation devices includes an interface, a first sensor, a second sensor, and control logic. The interface is to connect to a single contact pad of a host print apparatus. The first sensor is of a first type and is coupled to the interface. The second sensor is of a second type and is coupled to the interface. The second type is different from the first type. The control logic enables the first sensor or the second sensor to provide an enabled sensor. A voltage bias or a current bias applied to the interface generates a sensed current or a sensed voltage, respectively, on the interface indicating the state of the enabled sensor.