Seiko Epson Corporation

Toshihito Takagi

Shuichi Nakano

Jun Sato

Motonori Chikamoto

Hiromu Miyazawa

Provided is a printhead that performs printing by supplying a drive signal inputted to a second terminal to a drive element according to print data inputted to a first terminal, the printhead including: the first terminal; the second terminal; a determination circuit configured to perform based on different criteria, first determination to determine, in response to a first signal inputted to the first terminal, whether a potential of the second terminal is normal and second determination to determine, in response to a second signal inputted to the first terminal, whether the potential of the second terminal is normal; and a permission circuit configured to permit printing when the potential of the second terminal is determined to be normal in the first determination and second determination and does not permit printing when the potential of the second terminal is determined to be not normal in the first determination or second determination.

Printhead and inspection method of printhead

In a printhead control circuit causing a printhead to execute printing, the printhead performing abnormality detection in response to a first signal inputted to a second terminal in a state in which the potential of a first terminal is a first potential and a second signal inputted to the second terminal in a state in which the potential of the first terminal is a second potential, one of the first and second potentials is higher than the potentials of the first and second signals, and a signal circuit is configured to output the first and second signals. The signal circuit outputs the first signal to the second wire electrically coupled to the second terminal in a state in which the first wire is being supplied with a first voltage signal at the first potential and outputs the second signal to the second wire after outputting the first signal in a state in which the first wire is being supplied with a second voltage signal at the second potential, which is different from the first potential, to cause the printhead to execute the abnormality detection in response to the first signal, the second signal, the first voltage signal, and the second voltage signal.

Printhead control circuit and liquid ejecting apparatus

Disclosed a head unit including: a plurality of ejecting units that eject liquids; a driving IC that drives the plurality of ejecting units; a substrate; a first electrode group that includes a plurality of electrodes connected to the driving IC and the substrate; and a second electrode group that includes a plurality of electrodes connected to the driving IC and the substrate, in which the driving IC is a rectangular shape in plan view.

Head unit

A semiconductor device which is provided to correspond to each of a plurality of nozzles discharging a liquid and controls a plurality of drive elements causing a liquid to be discharged from each nozzle by an application of a drive signal includes a detection circuit which detects a residual vibration signal of the drive element, an output terminal which is provided to correspond to each of the plurality of drive elements, a discharge transistor which controls an application of the drive signal to the drive element through the output terminal, and a detection transistor which controls an application of the residual vibration signal to the detection circuit through the output terminal, in which the detection transistor is smaller than the discharge transistor in size, and the discharge transistor is disposed between the detection transistor and the output terminal.

Semiconductor device, liquid discharge head, and liquid discharge apparatus

A piezoelectric device includes a substrate composed of a (110) single crystal silicon, a driver IC formed in the substrate, and a piezoelectric device that is formed above the substrate and is driven by the driver IC, wherein the driver IC has an analog switch including a transistor, the transistor having a channel direction in &#x3c;001&#x3e; orientation of the substrate.

Growing community of inventors

Chino, Japan

Toshihito Takagi