In some examples, a fluid dispensing device includes a reservoir containing a fluid, fluidic actuators, and an interface to receive a data packet comprising information to control activation of the fluidic actuators, the data packet comprising a random number generated by a random number generator.

In one example, a warming system for a region of multiple ejector elements on an inkjet printhead includes a warming circuit having a heating element distinct from any of the ejector elements and a controller programmed to selectively energize the heating element only upon determining none of the ejector elements in the region is active.

A print element substrate, comprising a plurality of heating elements, a plurality of detection elements, each configured to detect a temperature of a corresponding heating element, a first current generation unit, a second current generation unit, and a signal output unit, wherein one of the first and second current generation units supplies a current to a first detection element, the other supplies a current to a second detection element, and the signal output unit outputs a signal according to a potential difference between one terminal of the first detection element on a side where a potential variation occurs upon supply of the current and one terminal of the second detection element on a side where a potential variation occurs upon supply of the current.

A liquid ejection head including a base substrate, an ejection port to eject a liquid, a heating element formed above the base substrate that heats the liquid to eject the liquid from the ejection port, a temperature detection element formed above the base substrate that detects a temperature of the liquid, a wiring layer connected to the heating element, a protective layer formed on the base substrate that protects the heating element and the wiring layer from the liquid, and a liquid supply port that penetrates the base substrate and supplies the liquid to the ejection port. When viewed in a direction perpendicular to the base substrate, the temperature detection element is disposed between the heating element and the liquid supply port, and the temperature detection element is formed on the protective layer.

In a head substrate according to an embodiment of the present invention comprises a plurality of nozzles for discharging liquid; a plurality of electrothermal transducers corresponding to the plurality of nozzles; and a plurality of drivers corresponding to the plurality of electrothermal transducers, the substrate has the following configuration. Specifically, it comprises a detection circuit that detects, in a case where one of the plurality of electrothermal transducers is selected, a temperature of the selected transducer to which a first signal is applied to in order to discharge a liquid from a nozzle corresponding to the selected electrothermal transducer, and then a second signal is applied to heat the selected electrothermal transducer.

A cap device includes a cap, an accommodation member, and a cover. The cap covers a nozzle surface of a liquid ejection head. The accommodation member is accommodated in the cap and is fixed to the cap. The accommodation member has a conductivity and receives a voltage that generates a potential difference between the liquid ejection head and the accommodation member. The accommodation member includes a first portion and a second portion connected with each other. The cover covers the second portion of the accommodation member, and has a surface that is co-planar with a surface of the first portion. The cover has a conductivity and receives a voltage that generates a potential difference between the liquid ejection head and the cover.

A liquid ejection head has a nozzle. A controller is configured to: control the liquid ejection head to perform inspection driving, the inspection driving being driving the liquid ejection head to eject liquid from the nozzle for determining whether the nozzle is an abnormal nozzle having an abnormality in ejection of liquid; acquire a determination signal outputted from the signal output device, the determination signal indicating whether the nozzle is the abnormal nozzle; acquire a non-driving signal outputted from the signal output device when the inspection driving is not performed by the liquid ejection head; generate a differential signal by superposing the determination signal and the non-driving signal, the differential signal being a signal indicating a difference between a value of the determination signal and a value of the non-driving signal at each timing; and determine whether the nozzle is the abnormal nozzle based on the differential signal.

A fluidic die including an array of fluid actuating devices addressable by a set of addresses, and an array of memory elements including a first portion to receive a first set of address bits representative of a first portion of an address of the set of addresses, and a second portion to receive a second set of address bits representative of a second portion of the address of the set of addresses. A first address driver is to provide a first portion of the address of the set of addresses based on the first set of address bits received by the first portion of memory elements, and a second address driver is to provide a remaining portion of the address of the set of addresses based on a second set of address bits received by the second portion of memory elements.

An integrated circuit for a print component including a number of memory bits. The integrated circuit may include a selection circuit to select at least one memory bit of the number of memory bits and fire actuators of a fire pulse group. The integrated circuit may include a memory voltage regulator to provide a write voltage to the at least one memory bit of the number of memory bits.

The disclosure concerns a test apparatus comprising a drum (100) configured such that ink drops (200) deposited on the surface of the drum form a printed marking (210) on the surface of the drum. The test apparatus further comprises an ink removal unit (300) configured to remove ink from the surface of the drum. The drum is at least partially transmissive of light and a light source (800) is disposed inside the drum to controllably illuminate the drum.