Seiko Epson Corporation

Dai Nozawa

Toru Matsuyama

Toru Kashimura

Kunio Tabata

Noritaka Ide

Yukihiro Hanaoka

Yoichiro Kondo

Koji Kitazawa

Rika Tanimoto

A liquid ejection system includes a first head unit and a second head unit. The first head unit includes a first determining circuit that determines whether a first power supply voltage is normal, a first drive circuit that outputs a first drive signal based on the first power supply voltage, and a first ejecting head that ejects liquid The second head unit includes a second determining circuit that determines whether a second power supply voltage is normal, a second drive circuit that outputs a second drive signal based on the second power supply voltage, and a second ejecting head that ejects liquid When the first determining circuit determines that the first power supply voltage is not normal, or when the second determining circuit determines that the second power supply voltage is not normal, the first ejecting head and the second ejecting head stop ejecting the liquid.

Liquid ejection system

A printing apparatus includes a liquid ejecting head that ejects a printing liquid to form an image on a medium, a circuit board provided with a drive circuit for driving the liquid ejecting head, and a storage mechanism for storing a cooling liquid in a liquid storage space. The storage mechanism stores the cooling liquid in the liquid storage space in which all of the drive circuit and a circuit arrangement portion of the circuit board are immersed in the cooling liquid. The circuit arrangement portion of the circuit board is provided with the drive circuit.

Printing apparatus

There is provided a liquid discharge apparatus includes a first transistor in which a second terminal and a third terminal are electrically coupled to according to a first terminal, a second transistor in which a fifth terminal and a sixth terminal are electrically coupled to according to a fourth terminal, and a coil that has one end electrically coupled to the second terminal and the sixth terminal, and the other end electrically coupled to the discharge head, a shortest distance between the second terminal and the one end of the coil is shorter than that between the third terminal and the one end of the coil, a shortest distance between the sixth terminal and the one end of the coil is shorter than that between the fifth terminal and the one end of the coil.

Liquid discharge apparatus

There is provided a liquid discharge apparatus includes a first transistor in which a second terminal and a third terminal are electrically coupled to according to a first terminal, and a second transistor in which a fifth terminal and a sixth terminal are electrically coupled to according to a fourth terminal, a first contact portion where the first terminal is in contact is smaller than a second contact portion where the second terminal is in contact, the second contact portion is smaller than a third contact portion where the third terminal is in contact, a fourth contact portion where the fourth terminal is in contact is smaller than a fifth contact portion where the fifth terminal is in contact, and the fifth contact portion is smaller than a sixth contact portion where the sixth terminal is in contact.

There is provided a liquid discharge apparatus includes an integrated circuit that has a first output terminal outputting a first control signal and a second output terminal outputting a second control signal, a first transistor in which a second terminal and a third terminal are electrically coupled to each other is made according to the first control signal input to a first terminal, and a second transistor in which a fifth terminal and a sixth terminal are electrically coupled to each other is made according to the second control signal input to a fourth terminal, a shortest distance between the first output terminal and the first terminal is shorter than that between the first output terminal and the second terminal, and a shortest distance between the second output terminal and the fourth terminal is shorter than that between the second output terminal and the fifth terminal.

A liquid ejecting apparatus includes a drive element, and a drive circuit that outputs a drive signal that drives the drive element, wherein the drive circuit includes a modulation circuit that modulates a base drive signal to output a modulation signal, an amplifier circuit that amplifies the modulation signal to output an amplified modulation signal, a demodulation circuit that demodulates the amplified modulation signal to output the drive signal, and a substrate on which the modulation circuit, the amplifier circuit, and the demodulation circuit are provided, wherein the substrate includes a base material includes a metal and a first layer laminated on the base material, wherein the first layer includes a first propagation wire through which at least one of the amplified modulation signal and the drive signal propagates, and wherein the base material has a thickness greater than a thickness of the first layer.

Liquid ejecting apparatus and circuit substrate

A liquid ejecting apparatus includes a drive circuit that outputs a drive signal, wherein the drive circuit includes a modulation circuit that modulates a base drive signal to output a modulation signal, an amplifier circuit that amplifies the modulation signal to output an amplified modulation signal, a demodulation circuit that demodulates the amplified modulation signal to output the drive signal, and a substrate on which the modulation circuit, the amplifier circuit, and the demodulation circuit are provided, wherein the substrate includes a first face and a second face opposite to the first face, wherein the demodulation circuit includes a first coil and a second coil electrically coupled in parallel with the first coil, and wherein the first coil is positioned so as to overlap at least part of the second coil in a direction normal to the first face.

Liquid ejecting apparatus and drive circuit

A liquid ejecting apparatus includes a print head including a drive element; a first circuit substrate electrically coupled to the print head; a second circuit substrate electrically coupled to the first circuit substrate; and a fixing portion that fixes the second circuit substrate to the first circuit substrate, wherein the first circuit substrate includes a coupling terminal electrically coupled to the print head, and a first substrate on which the coupling terminal is provided, wherein the second circuit substrate includes a drive signal output circuit that outputs a drive signal for driving the drive element and a second substrate on which the drive signal output circuit is provided, and wherein the fixing portion also serves as a output terminal through which the drive signal is output to the first circuit substrate.

Liquid ejecting apparatus, drive circuit, and circuit substrate

A liquid ejecting apparatus includes a print head that includes a first terminal and a second terminal, a first circuit substrate electrically coupled to the print head, and a second circuit substrate electrically coupled to the first circuit substrate, wherein the first circuit substrate includes a first coupling terminal electrically coupled to the print head, and a first electrolytic capacitor, wherein the second circuit substrate includes a constant voltage output circuit that outputs a constant voltage signal supplied to the second terminal, a first output terminal that is electrically coupled to the first circuit substrate, and a second output terminal that is electrically coupled to the first circuit substrate, and through which the constant voltage signal is output to the first circuit substrate, wherein the first electrolytic capacitor is electrically coupled to the second output terminal and the first coupling terminal.

A liquid ejection apparatus includes a liquid ejection head that ejects a liquid by driving a drive element, a drive signal output circuit that outputs a drive signal for driving the drive element, and a substrate provided with the drive signal output circuit, wherein the drive signal output circuit includes a modulation circuit that modulates an original drive signal to output a modulation signal, an amplifier circuit that amplifies the modulation signal to output an amplified modulation signal, and a demodulation circuit that demodulates the amplified modulation signal to output the drive signal for driving the drive element, and wherein the demodulation circuit is located, on the substrate, between the modulation circuit and the amplifier circuit.

Liquid ejection apparatus and circuit board

A liquid discharging apparatus that includes a discharging head for discharging liquid, a driving circuit for generating a driving signal, and a circuit board, in which the driving circuit includes a coil and a capacitor, the circuit board includes a first layer, a second layer, first wiring provided at the first layer, second wiring provided at the second layer, and interlayer wiring, the first wiring couples a first start point and a first end point, and is provided in a circumferential shape, the second wiring couples a second start point and a second end point, and is provided in a circumferential shape, the interlayer wiring electrically couples the first end point and the second start point, the first wiring and the second wiring partially overlap each other, and the first wiring, the second wiring, and the interlayer wiring constitute at least a part of the coil.

Liquid discharging apparatus and circuit board

A driving circuit generating a driving signal, includes a modulator generating a modulated signal by performing pulse modulation on a signal specifying a waveform of the driving signal, an amplifier generating an amplified signal by amplifying the modulated signal, and a smoothing section generating the driving signal by smoothing the amplified signal. The amplifier includes first and second transistors coupled in series between a voltage line to which a voltage which is higher than a ground voltage is supplied and a grounding conductor to which the ground voltage is supplied, and a third transistor having a drain electrode coupled to a gate electrode of the second transistor and a source electrode coupled to the grounding conductor. The first and second transistors are exclusively set to an On state in accordance with the modulated signal, and the amplified signal is output from a node which couples the first and second transistors.

Driving circuit and liquid ejection apparatus

A liquid discharging apparatus has: a first driving signal creation circuit that has a first transistor and a first integrated circuit; a second driving signal creation circuit that has a second transistor and a second integrated circuit; a third driving signal creation circuit that has a third transistor and a third integrated circuit; and a circuit board having a first side, a second side opposite to the first side, a third side, and a fourth side opposite to the third side. The first integrated circuit and first transistor are positioned on the circuit board side by side in a direction away from the first side and toward the second side. The third integrated circuit and third transistor are positioned on the circuit board side by side in a direction away from the third side and toward the fourth side.

Liquid discharging apparatus and driving circuit board

A driving circuit for a capacitive load comprises: a demodulator including an inductor; a circuit board supporting the demodulator; and wiring patterns on the circuit board. The wiring patterns include first and second wiring patterns that are separated from each other. In the inductor, a coil and a core are integrally formed and are mounted on the circuit board so that an axial direction of the core around which the coil is wound intersects the circuit board, and part of the core is directly exposed to the circuit board. The first wiring pattern is electrically connected to a first terminal of the coil. The second wiring pattern is electrically connected to a second terminal of the coil. The first and second wiring patterns do not extend between the coil and the circuit board, and also do not extend between the core and the circuit board.

Driving circuit for capacitive load

A liquid ejecting apparatus includes a first ejecting section that includes a first drive element and ejects liquid by driving the first drive element, a first drive circuit that includes a first transistor and outputs a first drive signal to the first drive element, a second drive circuit that includes a second transistor and outputs a second drive signal to the first drive element, a circuit substrate on which the first drive circuit and the second drive circuit are mounted. The first drive circuit is mounted on a first surface of the circuit substrate, and the second drive circuit is mounted on a second surface of the circuit substrate, and the first transistor and the second transistor are disposed at position that do not overlap one another in plan view of the circuit substrate.

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Matsumoto, Japan

Dai Nozawa