Seiko Epson Corporation

Tokyo R & D Co., Ltd.

Seiko Epson Corporaition

Kunio Tabata

Atsushi Oshima

Noritaka Ide

Hiroyuki Yoshino

Shinichi Miyazaki

Toshiyuki Suzuki

Osamu Shinkawa

Atsuya Hirabayashi

Nobuaki Azami

Tomoki Hatano

Seiichi Taniguchi

Minoru Kozaki

Hiroyuki Aizawa

Takeshi Seto

Kunihiko Takagi

Yoshikazu Koike

Shoichiro Yokoo

Issei Yamakoshi

Yasuhiro Ono

Nobuki Sasaki

Atsushi Mizukoshi

Takeo Sato

Hideki Kojima

Akihito Uetake

Takahiro Matsuzaki

Shigeo Sugimura

Kaneo Yoda

Yukihiro Hanaoka

Dai Nozawa

Takashi Nagate

Akihiko Ikegami

Akiyoshi Ishiguro

Rika Tanimoto

Michio Sato

A liquid discharge apparatus includes a liquid discharge head that includes a plurality of capacitive loads driven by being supplied with a drive signal and discharges a liquid by driving the plurality of capacitive loads, and a capacitive load drive circuit, in which the capacitive load drive circuit includes a correction circuit, a modulation circuit, an amplification circuit, a demodulation circuit, and a feedback circuit, and the correction circuit outputs the correction base drive signal corrected according to the number of drive capacitive loads driven by the drive signal among the plurality of capacitive loads.

Liquid discharge apparatus and capacitive load drive circuit

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 liquid discharge apparatus in which a level shift circuit executes, one or a plurality of times according to a voltage value of a capacitor included in a bootstrap circuit detected by a voltage detection circuit, a second control of outputting a third gate signal for controlling a third transistor to be non-conductive and a fourth gate signal for controlling a fourth transistor to be conductive, and then, outputting the third gate signal for controlling the third transistor to be conductive and the fourth gate signal for controlling the fourth transistor to be non-conductive.

A driving circuit includes an amplification circuit configured to output an amplified modulation signal from a first output point and a level shift circuit configured to output a level-shift amplified modulation signal from a second output point. The level shift circuit includes a second gate driver that outputs a third gate signal and a fourth gate signal, a third transistor, and a fourth transistor. The second gate driver outputs, when a potential of a base driving signal is lower than a predetermined potential, the third gate signal for controlling the third transistor to be conductive and the fourth gate signal for controlling the fourth transistor to be nonconductive, and when a potential of the base driving signal is higher than the predetermined potential, the third gate signal for controlling the third transistor to be nonconductive and the fourth gate signal for controlling the fourth transistor to be conductive.

Driving circuit and liquid ejecting apparatus

A driving circuit includes an amplification circuit that outputs an amplified modulation signal and a level shift circuit. In the level shift circuit, when a reference potential of the amplified modulation signal is shifted to a second potential from a first potential, a second gate driver outputs a third gate signal for controlling a third transistor to be nonconductive and a fourth gate signal for controlling a fourth transistor to be conductive, then outputs the third gate signal for controlling the third transistor to be conductive and the fourth gate signal for controlling the fourth transistor to be nonconductive, and thereafter outputs the third gate signal for controlling the third transistor to be nonconductive and the fourth gate signal for controlling the fourth transistor to be conductive.

A driving circuit includes an amplification circuit configured to output an amplified modulation signal and a level shift circuit. The level shift circuit includes a second gate driver that outputs a third gate signal and a fourth gate signal, a third transistor that operates based on the third gate signal, and a fourth transistor that operates based on the fourth gate signal. The second gate driver outputs the third gate signal for controlling the third transistor to be conductive and the fourth gate signal for controlling the fourth transistor to be nonconductive in a second period in which a driving signal is fixed in a second potential that is higher than a first potential and lower than a third potential and the fourth gate signal for controlling the fourth transistor to be nonconductive.

An amplifier circuit, a level shift circuit; and a demodulation circuit, in which in a second mode obtained by shifting a reference potential of the amplification modulation signal to a second potential having a potential higher than a first potential, the second gate driver included in the level shift circuit performs a constant voltage control that outputs a third gate signal controlling a third transistor to be conductive and a fourth gate signal controlling a fourth transistor to be non-conductive, and a charge control that outputs the third gate signal controlling the third transistor to be non-conductive and the fourth gate signal controlling the fourth transistor to be conductive, and then outputs the third gate signal controlling the third transistor to be conductive and the fourth gate signal controlling the fourth transistor to be non-conductive.

Drive circuit and liquid ejecting apparatus

A level shift circuit and when a reference potential of the amplification modulation signal is transitioned from a first potential to a second potential having a high potential, a second gate driver performs a first control that outputs a third gate signal controlling a third transistor to be non-conductive and a fourth gate signal controlling a fourth transistor to be conductive, and then outputs the third gate signal controlling the third transistor to be conductive and the fourth gate signal controlling the fourth transistor to be non-conductive, and a second control that outputs the third gate signal controlling the third transistor to be non-conductive and the fourth gate signal controlling the fourth transistor to be conductive after the first control, and then outputs the third gate signal controlling the third transistor to be conductive and the fourth gate signal controlling the fourth transistor to be non-conductive.

A level shift circuit that outputs a level shift amplification modulation signal obtained by shifting a potential of an amplification modulation signal output by an amplifier circuit is provided, a potential of a first voltage supplied to one end of a first transistor of the amplifier circuit is larger than a potential of a second voltage supplied to a bootstrap circuit which is a reference of a third voltage supplied to one end of a third transistor included in the level shift circuit, and a second gate driver included in the level shift circuit outputs a third gate signal that switches an operation of the third transistor and a fourth gate signal that switches an operation of a fourth transistor, in a period during which a potential of a drive signal is between the potential of the first voltage and the potential of the second voltage.

A first switching circuit, a second switching circuit, a first bootstrap circuit that is coupled to the first switching circuit and the second switching circuit, and a smoothing circuit and outputs a drive signal are provided, in which the second switching circuit includes a second gate driver that outputs a third gate signal and a fourth gate signal, a third transistor of which the first voltage is supplied, and which is driven based on the third gate signal, a fourth transistor which is driven based on the fourth gate signal, and a second bootstrap circuit that includes a second capacitive element supplying a third voltage to the second gate driver and coupled to a second output point and the second gate driver, and a second diode of which the first voltage is supplied and which is coupled to the second capacitive element.

A power generation unit includes a deforming member (a beam) adapted to deform while switching a deformation direction, a first piezoelectric device provided to the deforming member (the beam), a second piezoelectric device provided to the deforming member (the beam), an inductor electrically connected to the first piezoelectric device, a switch disposed between the first piezoelectric device and the inductor, and a control section adapted to detect a voltage generated in the second piezoelectric device, and if the voltage detected has a level one of equal to and higher than a predetermined level, electrically connect the first piezoelectric device and the inductor to each other using the switch.

Power generation unit, electronic apparatus, transportation device, and method of controlling power generation unit

A power generating device includes: a piezoelectric member that is formed from a piezoelectric material; one pair of electrodes that are installed to the piezoelectric member; a transformation unit that repeatedly transforms the piezoelectric member; an inductor that is installed between the one pair of electrodes and configures a resonance circuit together with a capacitive component of the piezoelectric member; a switch that is connected to the inductor in series; and a switch control unit that connects the switch when a transformation direction of the piezoelectric member is switched, and cuts off the switch when a time corresponding to a half period of a resonance period of the resonance circuit elapses.

Power generating device and electronic component

A fluid ejection device includes: a fluid chamber; a volume varying unit configured to vary the volume of the fluid chamber; a fluid supplying unit configured to supply fluid to the fluid chamber at a predetermined pressure; and an ejection command switching unit configured to switch a fluid ejection between a pulsed flow ejection which ejects the fluid in a pulsed manner by activating the volume varying unit and varying the volume of the fluid chamber and a continuous flow ejection which ejects the fluid with a fluid supply pressure from the fluid supplying unit higher than that in the case of the pulsed flow ejection in a state in which the volume varying unit is stopped.

Fluid ejection device and method of controlling fluid ejection device

A liquid ejecting device includes a driving waveform signal generating circuit that generates a driving waveform signal, a modulation circuit that performs pulse modulation on the driving waveform signal to generate a modulation signal, a digital power amplifier that amplifies power of the modulation signal to generate a power amplification modulation signal in the form of a pulse wave, a filter that smoothes the power amplification modulation signal in the pulse wave to generate the driving signal, a connection cable that connects the filter to the capacitive load and is provided such that at least one of the filter and the capacitive load is detachable, a connection line information acquiring unit that acquires connection line information associated with the connection cable, and a frequency changing unit that changes a frequency when the modulation circuit performs the pulse modulation on the driving waveform signal, on the basis of the connection line.

Liquid ejecting device

A fluid jet device including a fluid chamber with variable capacity and a capacity varying section adapted to vary the capacity of the fluid chamber in response to supply of a drive signal. A drive waveform section making the capacity varying section operate so as to compress the capacity of the fluid chamber and a restoring drive waveform section making the capacity varying section operate to restore the capacity of the fluid chamber before compressing the capacity in a signal waveform. The drive signal supply section controls supply content of the drive signal to provide a restoring period adapted to restore a steady state of the fluid flowing toward an inside of the fluid chamber in a period from when the compressing drive waveform section in the drive signal is supplied to when a subsequent compressing drive waveform section is supplied.

Growing community of inventors

Shiojiri, Japan

Kunio Tabata