Abstract: 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.

Abstract: An atomic oscillator includes: a light emitting element; a temperature control element that controls a temperature of the light emitting element; an atomic cell which is irradiated with a light from the light emitting element and in which an alkali metal atom is contained; a light detection element that detects a light transmitted through the atomic cell; an oscillator that outputs an oscillation signal; a wave detection circuit that detects a wave of a signal, which is based on an output of the light detection element, using the oscillation signal of the oscillator, and outputs a wave detection signal; and a drive circuit that includes a constant current circuit generating a current of a specified value for driving the light emitting element and superimposes a modulation current, which is based on the oscillation signal of the oscillator, on the current to output a drive current to the light emitting element.

Abstract: An atomic oscillator includes a light source; an atomic cell in which alkali metal atoms are contained and on which light that is emitted from the light source is incident; a first coil that applies a magnetic field to the atomic cell; a first shield that contains the atomic cell and the first coil and shields a magnetic field; a second shield that includes a first member having a recess and a second member, containing the light source and the first shield in a space which is formed by the first member and the second member, and the second shield shields the magnetic field; and a second coil that generates a magnetic field passing through an opening of the recess.

Abstract: An atomic oscillator includes: a light emitting element; a temperature control element that controls a temperature of the light emitting element; an atomic cell which is irradiated with a light from the light emitting element and in which an alkali metal atom is contained; a light detection element that detects a light transmitted through the atomic cell; an oscillator that outputs an oscillation signal; a wave detection circuit that detects a wave of a signal, which is based on an output of the light detection element, using the oscillation signal of the oscillator, and outputs a wave detection signal; and a drive circuit that includes a constant current circuit generating a current of a specified value for driving the light emitting element and superimposes a modulation current, which is based on the oscillation signal of the oscillator, on the current to output a drive current to the light emitting element.

Abstract: An atomic oscillator includes a light source; an atomic cell in which alkali metal atoms are contained and on which light that is emitted from the light source is incident; a first coil that applies a magnetic field to the atomic cell; a first shield that contains the atomic cell and the first coil and shields a magnetic field; a second shield that includes a first member having a recess and a second member, containing the light source and the first shield in a space which is formed by the first member and the second member, and the second shield shields the magnetic field; and a second coil that generates a magnetic field passing through an opening of the recess.

Abstract: 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.

Abstract: A liquid ejection device includes a switching circuit. The switching circuit includes: a multilayer wiring board including a first wiring layer and a second wiring layer; a first transistor and a second transistor mounted on the first wiring layer side of the multilayer wiring board; and a capacitor mounted on the second wiring layer side of the multilayer wiring board. When the multilayer wiring board is viewed in a plan view, a third via conductor is arranged in an area not overlapping a straight-line path connecting a source electrode of the first transistor with a drain electrode of the second transistor in a second wire.

Abstract: 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.

Abstract: 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.

Abstract: A medical instrument includes a multilayer wiring board having first, second and third wirings, a fourth wiring formed in a first wiring layer, and a fifth wiring formed in a second wiring layer. A first via conductor electrically connects the third and fifth wirings. A second via conductor electrically connects the fourth and fifth wirings. The medical instrument further includes first and second transistors, a second transistor, and a capacitor mounted on the first wiring layer side of the multilayer wiring board. The drain and source electrodes of the first transistor are electrically connected to the first and second wirings, respectively. The drain electrode of the second transistor is electrically connected to the second wiring. The source electrode of the second transistor is electrically connected to the third wiring. The first and second electrodes of the capacitor are electrically connected to the first and fourth wirings, respectively.

Abstract: A liquid jet apparatus according to the present invention includes a drive waveform generator adapted to generate a drive waveform signal, a modulator adapted to execute pulse modulation on the drive waveform signal, a digital power amplifier adapted to power-amplify the modulated signal, on which the pulse modulation is executed by the modulator, with a pair of switching elements push-pull coupled with each other, a low pass filter adapted to smooth the amplified digital signal obtained by the power-amplification of the digital power amplifier, and a modulation period modification circuit adapted to modify a modulation period of the pulse modulation of the modulator based on data of the drive waveform signal.

Abstract: A power generation unit includes a deforming member adapted to repeatedly deform a piezoelectric element, a pair of electrodes provided to the piezoelectric element, an inductor disposed between the pair of electrodes, and constituting a resonant circuit together with a capacitive component of the piezoelectric element, a first switch connected in series to the inductor, a member adapted to detect a timing at which a deformation direction of the deforming member is switched, a full bridge rectifier adapted to rectify a current output from the pair of electrodes, a capacitor connected to the full bridge rectifier, and adapted to store a current supplied from the full bridge rectifier, a second switch connected between either one of the pair of electrodes and the capacitor, and a control circuit adapted to operate the first switch and the second switch.

Abstract: 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.

Abstract: 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.

Abstract: A power generation unit includes a deforming member adapted to deform while switching a deformation direction, a piezoelectric device provided to the deforming member, a displacement detection section adapted to detect that the deforming member is displaced beyond a predetermined level, an inductor electrically connected to the piezoelectric device, a switch disposed between the piezoelectric device and the inductor, and a control section adapted to set the piezoelectric device and the inductor to an electrically conductive state via the switch if the displacement detection section detects that the deforming member is displaced beyond the predetermined level.

Abstract: A capacitive load driving circuit includes: a drive waveform signal generator that generates a drive waveform signal; a subtractor that outputs a differential signal between the drive waveform signal and a feedback signal; a modulator that pulse-modulates the differential signal and outputs a modulated signal; a digital power amplifier that amplifies the power of the modulated signal and outputs a power-amplified modulated signal; a smoothing filter that smoothes the power-amplified modulated signal, and outputs a drive signal of the capacitive load; a compensator that causes a phase to precede the drive signal; and an attenuator that attenuates signal amplitude in a band at least including a modulation frequency of the modulated signal. A signal output from a connecting point between the inductor and the wire is made to pass through the compensator and the attenuator and is then used as a feedback signal to the subtractor.

Abstract: Operation of a digital power amplifier for power amplification of a modulated signal is stopped in a period in which a voltage value of a drive signal applied to a capacitive load is constant, to thereby suppress power loss. The power amplification is stopped either when half a period of time when the modulated signal in a first voltage state maintains the first voltage state elapses or when half a period of time when the modulated signal in a second voltage state which is lower in voltage than the first voltage state maintains the second voltage state elapses. Accordingly, when electric current does not flow in a inductor of a low pass filter, it is possible to stop the power amplification. Thus, it is possible to prevent generation of voltage fluctuation in the drive signal due to an electromotive force caused by a self-induction phenomenon of the inductor.

Abstract: A liquid ejection device, includes: a drive waveform signal output circuit which outputs a drive waveform signal to serve as a reference for the drive signal; a modulator which pulse-modulates the drive waveform signal and thus generates a first modulated signal and a second modulated signal having a different phase from the first modulated signal within a range from greater than 90 degrees to smaller than 270 degrees; a first digital power amplifier; a second digital power amplifier a first low pass filter which performs low pass filtering of the first amplified digital signal and thus generates a first demodulated signal; and a second low pass filter which performs low pass filtering of the second amplified digital signal and thus generates a second demodulated signal; wherein the first demodulated signal and the second demodulated signal are combined and applied as the drive signal to the capacitive load.

Abstract: 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.

Abstract: A power amplifier includes: a modulator pulse-modulating a drive waveform signal serving as a reference of a drive signal applied to an actuator and outputting a plurality of modulated signals; a digital power amplifier having a plurality of digital power amplifier stages each including a pair of push-pull switching elements, amplifying the power of the plurality of modulated signals, and outputting multi-value amplified digital signals; and a low pass filter smoothing the amplified digital signals and outputting the drive signal, wherein the modulator includes a control section switching one of a state where the same modulated signal is connected to two or more of the digital power amplifier stages and a state where different modulated signals are connected to different digital power amplifier stages to the other.