Patent application number | Description | Published |
20090189453 | DRIVING CIRCUIT FOR CAPACITIVE LOAD AND FLUID INJECTING DEVICE - A driving circuit that drives a capacitive load includes a drive signal generator that generates a drive signal driving the capacitive load via a transistor pair in response to an analog signal, and a power-source voltage generator that generates a high-voltage power-source voltage and a low-voltage power-source voltage and that supplies the high-voltage power-source voltage and the low-voltage power-source voltage respectively to collectors of the transistors of the transistor pair via a high-voltage output terminal and a low-voltage output terminal. The power-source voltage generator includes multiple power sources connected in parallel, a backcurrent prevention diode connected between the adjacent power sources, and a switch unit that connects the adjacent power sources in series under the on-off control of a controller each time the drive signal rises above a predetermined threshold value or falls below a predetermined threshold value. | 07-30-2009 |
20090189936 | HEAD UNIT AND LIQUID EJECTING METHOD - A head unit includes: a first nozzle group which has a plurality of nozzles ejecting liquid droplets onto a medium to form an image; a second nozzle group which has a plurality of nozzles which do not eject liquid droplets onto the medium, while the nozzles of the first nozzle group eject the liquid droplets onto the medium to form the image; and a controller which determines whether to eject the liquid droplets from each of the nozzles of the first nozzle group on the basis of data individually corresponding to the nozzles of the first nozzle group and which commonly determines whether to eject the liquid droplets from the nozzles of the second nozzle group on the basis of data commonly corresponding to the nozzles of the second nozzle group. | 07-30-2009 |
20090189957 | DRIVING CIRCUIT FOR CAPACITIVE LOAD AND FLUID INJECTING DEVICE - A driving circuit that drives a capacitive load includes a drive signal generator that generates a drive signal that drives the capacitive load via a transistor pair in response to an analog signal. A power-source voltage generator generates high-voltage and low-voltage power-source voltages and supplies the power-source voltages to collectors of the transistors via a high-voltage output terminal and a low-voltage output terminal. The power-source voltage generator includes multiple power sources connected in parallel and a switch unit that connects the adjacent power sources in series each time the drive signal rises above or falls below a predetermined threshold value. The driving circuit further includes a voltage controlling capacitor connected to the low-voltage output terminal of the power source, and a power recovery unit having a switch unit that recovers a charge accumulated in the voltage controlling capacitor back to the power source via the high-voltage output terminal. | 07-30-2009 |
20090206888 | DRIVING CIRCUIT FOR CAPACITIVE LOAD AND LIQUID INJECTING APPARATUS - A driving circuit for a capacitive load includes a driving signal generating unit that generates a driving signal for driving the capacitive load by using a pair of driving transistors. A power source voltage generating unit generates high-voltage and low-voltage power source voltages that are higher and lower, respectively, than the voltage of the driving signal and applies the voltages to collectors of the driving transistors. The power source voltage generating unit includes a pair of power source transistors and a capacitor. The low-voltage power source voltage is generated in an output side of the power-source transistor pair as a voltage that is in a voltage region lower than that of the driving signal and follows the driving signal. The high-voltage power source voltage is output from a high-voltage terminal of the capacitor, is in a voltage region higher than that of the driving signal, and follows the driving signal. | 08-20-2009 |
20090207200 | LIQUID DISCHARGING APPARATUS AND METHOD OF DISCHARGING LIQUID - A liquid discharging apparatus stores data transmitted at each timing of a predetermined period in first storage units for the each timing and discharges liquid droplets from nozzles based on the data stored in the first storage units for the each timing. The liquid discharging apparatus includes the nozzles and the first storage units, which are disposed for the nozzles for storing the data for controlling discharge of the liquid droplets from the nozzles. A second storage unit is used for storing the data transmitted at a timing. A data selecting unit is used for selecting whether to store the data transmitted at another timing after the timing in the first storage unit or to store the data stored in the second storage unit in the first storage unit when the data is stored in the first storage units at the each timing. | 08-20-2009 |
20110242162 | LIQUID EJECTING APPARATUS - A liquid ejecting apparatus having a missing dot detection function capable of performing rapid and accurate missing dot detection with a simple configuration is provided. A liquid ejecting apparatus having a recording head that performs an ejection of ink droplets through nozzle orifices toward a recording sheet includes the recording head having a pair of electrodes electrically disconnected from each other and disposed around the nozzle orifices, wherein the ink droplets have a conductive property; continuity detector that detects the electrodes are electrically connected or disconnected during the ejection; and control means that controls the ejection of the ink droplets by the recording head. | 10-06-2011 |
20120236053 | LIQUID EJECTING APPARATUS AND LIQUID EJECTING METHOD - A liquid ejecting apparatus including, a control unit including a digital signal generation unit which generates a digital signal defining the shape of the signal waveform, an analog voltage signal generation unit which generates an analog voltage signal on the basis of the digital signal, and a current signal generation unit which generates a current signal of a magnitude corresponding to a waveform of the analog voltage signal, a head unit including, a voltage signal generation unit which generates a voltage signal by detecting a potential difference between two points which are different from each other in a path to which the current signal flows, and by amplifying the potential difference, and an element which is driven by the voltage signal, and causes liquid to be ejected from a nozzle, and a transmission unit which transmits the current signal to the head unit from the control unit. | 09-20-2012 |
20120242725 | LIQUID EJECTING APPARATUS - A liquid ejecting apparatus includes: a carriage that moves in an orthogonal direction that is orthogonal to a transport direction in which a medium is transported; and a head unit, provided in the carriage, that includes a nozzle, a driving element that causes a liquid to be ejected through the nozzle, a head control unit that controls the driving of the driving element by selectively applying a driving signal to the driving element, and a head case that has a part formed of a metal member and that houses the head control unit within the case in a state in which the head control unit makes contact with the metal member. | 09-27-2012 |