Disclosed are an apparatus and a method for quickly and accurately inspecting a droplet on a substrate. An apparatus for inspecting a droplet on a substrate according to an exemplary embodiment of the present disclosure includes: an ultrasonic sensor configured to apply an ultrasonic wave to a droplet on the substrate and detect an ultrasonic wave reflected from the substrate; and a processor configured to acquire a height of the droplet at each position on the substrate on the basis of a signal of the ultrasonic wave reflected from the droplet on the substrate, calculate a volume of the droplet on the basis of the heights of the droplet at the positions, and store or output data in relation to the volume of the droplet. The embodiment of the present disclosure may calculate the volume of the droplet using the ultrasonic wave, thereby quickly and accurately inspecting the droplet on the substrate.

The application describes an ink delivery system for an inkjet printer. The system includes a first ink tank operative to supply ink to at least one inkjet printhead and a second ink tank operative to receive ink flown through at least one printhead and not used by at least one printhead. The ink for printing is drawn by low pressure from a first tank through the printhead to a second ink tank. Each of the ink tanks includes a cylindrical tubular segment and a segment with a frustoconical inner section.

In an example, a method comprises fabricating a first validation device for association with a first replaceable print apparatus component. The device may be to form part of circuitry arranged on the first replaceable print apparatus component, and may provide an associated electrically detectable characteristic which varies with the position of at least part of the first validation device. The electrically detectable characteristic may be measured and data indicative of the characteristic may be stored in a first memory. The first replaceable print apparatus component comprising the first device and the first memory may be assembled.

It is disclosed a printing agent container having ink an authenticity detection mechanisms comprising: a receptacle having a top wall a bottom wall opposing such top wall and a sidewall between such top wall and such bottom wall; an internal volume defined by such receptacle that contains a printing agent, and a vibration transducer on one of the side walls, wherein the container is to be mechanically coupled to a carriage so that the printing fluid is disposed on the bottom surface, being the vibration transducer to detect a vibration signal induced by the carriage and wherein the container comprises a communication channel to a controller being the controller to receive through the communication channel a container signature from the vibration transducer and to identify a container identification signal associated to the container signature.

Disclosed are an apparatus and a method for quickly and accurately inspecting a droplet on a substrate. An apparatus for inspecting a droplet on a substrate according to an exemplary embodiment of the present disclosure includes: an ultrasonic sensor configured to apply an ultrasonic wave to a droplet on the substrate and detect an ultrasonic wave reflected from the substrate; and a processor configured to acquire a height of the droplet at each position on the substrate on the basis of a signal of the ultrasonic wave reflected from the droplet on the substrate, calculate a volume of the droplet on the basis of the heights of the droplet at the positions, and store or output data in relation to the volume of the droplet. The embodiment of the present disclosure may calculate the volume of the droplet using the ultrasonic wave, thereby quickly and accurately inspecting the droplet on the substrate.

Provided is a printer including an ink tank, a print head performing printing by using ink in the ink tank, a light source provided at the substrate and irradiating the ink tank with light from a side of the ink tank, a photoelectric conversion device provided at the substrate and detecting light incident from the ink tank in a period during which the light source emits light, and a processing unit detecting an amount of ink based on an output of the photoelectric conversion device.

In an example, a fluid level sensor comprises a vibrational paddle wherein an edge of the vibrational paddle comprises a fluid surface contact point having a peaked profile.

A fluid container orientation sensor is disclosed. The fluid container orientation sensor may comprise a first vibrational member having a first resonant behaviour and a second vibrational member having a second resonant behaviour. The first vibrational member may be disposed at a first depth within the fluid container. The second vibrational member may be disposed at a second depth within the fluid container A method and a print apparatus are also disclosed.

A replaceable print component is disclosed that comprises first and second electrodes, and a circuit electrically connected between the first and second electrodes to vary an electrical property of the circuit with a frequency component within a selected frequency range to indicate a parameter of a part of the circuit in response to a stimulus.

Provided is a printer including an ink tank having a mark at a side surface of the ink tank, a print head performing printing by using ink in the ink tank, a photoelectric conversion device provided outside the side surface having the mark among side surfaces of the ink tank, and detecting light from the ink tank, and a processing unit determining a position of an interface of the ink based on an output of the photoelectric conversion device and detecting an amount of ink in the ink tank based on a position of the mark and the position of the interface.