Oki Data Corporation

Oki Electric Industry Co., Ltd.

I-pex Piezo Solutions Inc.

Toru Kosaka

Akira Hagiwara

Takahito Suzuki

Yusuke Nakai

Hironori Furuta

Masao Yaji

Chihiro Takahashi

Kenichi Tanigawa

Shinya Jyumonji

Shuichi Suzuki

Yutaka Kitajima

Takuma Ishikawa

Hiroto Kawada

Yuuki Shinohara

Eiji Wagatsuma

Hiroaki Kanamori

Genichiro Matsuo

Genichirou Matsuo

Takeshi Iizuka

Akio Konishi

A semiconductor element unit includes a semiconductor element; and a first electrode having a flat first electrode mounting surface whose surface roughness is less than or equal to 10 [nm] and forming eutectic bonding with the semiconductor element in a part different from the first electrode mounting surface. A semiconductor element unit supply substrate includes one or more semiconductor element units. A semiconductor packaging circuit includes the semiconductor element unit.

Semiconductor element unit and method of manufacturing thereof, semiconductor element unit supply substrate, and semiconductor packaging circuit and method of manufacturing thereof

A composite integrated film includes a base member thin film having a base member first surface and a base member second surface facing each other, one or more penetration parts penetrating the base member first surface and the base member second surface of the base member thin film, one or more electrodes each including an electrical path part formed between the base member first surface and the base member second surface via the penetration part and an electrode surface in a planar shape formed on the base member second surface's side, and one or more elements provided on the base member first surface of the base member thin film and electrically connected to the electrodes, wherein the electrode surface and the base member second surface form a same flat surface.

Composite integrated film, composite integrated film supply wafer, and semiconductor composite device

A humidity detection device includes a humidity sensor, a resistor connected to one-side of the humidity sensor, a first switching part connected to the resistor; a diode connected to the first switching part; a second switching part connected to the other-side of the humidity sensor, a potential difference generating part connected to the second switching part, a power supply supplying a voltage, and a control part applying the voltage as an alternating voltage to the humidity sensor by controlling the first switching part and the second switching part. The control part applies a current to the diode, the resistor and the humidity sensor in a first direction by connecting the second switching part to the ground, and applies the current to the resistor and the humidity sensor in a second direction, which is an opposite direction from the first direction, by connecting the first switching part to the ground.

Humidity detection device and image forming apparatus

An image forming apparatus includes a power supply voltage detector, a power supply cycle detector, a voltage converter, and a controller. The power supply voltage detector detects a power supply voltage value of a commercial alternating-current voltage. The power supply cycle detector detects a power supply cycle of the commercial alternating-current voltage. The voltage converter performs switching of the commercial alternating-current voltage, and thereby converts the commercial alternating-current voltage into a heater alternating-current voltage to be applied to a heater. The controller controls the voltage converter and thereby generates the heater alternating-current voltage, on a basis of the power supply voltage value detected by the power supply voltage detector and the power supply cycle detected by the power supply cycle detector. The heater alternating-current voltage has an effective value that is stepped down from an effective value of the commercial alternating-current voltage, and is synchronized with the power supply cycle.

Image forming apparatus with varying heater voltage

An image formation apparatus includes: one or more image formation units; one or more heaters; a first voltage converter which generates a direct first voltage based on an alternating external input voltage inputted from outside of the first voltage converter; a second voltage converter which generates an alternating second voltage based on the first voltage, the second voltage supplying alternating-current power to the one more heaters; a third voltage converter which generates a third voltage based on the first voltage, the third voltage being used to drive at least the one or more heaters; a controller which performs an operation control of reducing power consumption in at least the one or more heaters when the external input voltage decreases to a range of a first threshold or lower and higher than a second threshold and/or when a load change of the first voltage converter is lower than a third threshold.

Heater control device and image formation apparatus

Provided is a power supply unit that includes a power factor correction circuit, a synchronizing signal generator, an alternating-current signal generator. The power factor correction circuit is configured to generate, based on a first alternating-current signal, a direct-current signal. The synchronizing signal generator is configured to generate, based on the first alternating-current signal, a synchronizing signal that is in synchronization with the first alternating-current signal. The alternating-current signal generator includes a switching section, and is configured to generate, based on the direct-current signal, a second alternating-current signal. The switching section is configured to perform, based on the synchronizing signal, a switching operation. The second alternating-current signal has a variable effective voltage value.

Power supply unit and image forming apparatus

Provided is a power supply unit that includes a switching section and a controller. The switching section is configured to perform a switching operation and thereby generate, based on an input signal, a first alternating-current signal. The controller is configured to control the switching operation and thereby perform an amplitude control that involves increasing, based on an input current in the switching section, a signal amplitude of the first alternating-current signal.

A heater control device includes a power factor correction circuit configured to convert an alternate current voltage from a commercial power source to a direct current voltage; an inverter configured to generate a specific alternate current voltage from the direct current voltage converted with the power factor correction circuit; a heater configured to receive the specific alternate current voltage generated with the inverter; and an excessive temperature rise preventing portion configured to interrupt the specific alternate current voltage generated with the inverter from being supplied to the heater.

Heater control device and image forming apparatus

Provided is a heater controlling unit that includes: a power factor correction circuit configured to convert a first alternating-current voltage supplied from a power supply into a direct-current voltage; an inverter configured to generate a second alternating-current voltage from the direct-current voltage converted by the power factor correction circuit; and a heater to which the second alternating-current voltage generated by the inverter is applied.

Heater control unit and image forming apparatus

A power supply device includes a voltage output unit configured to output a DC voltage corresponding to a control signal from a first controller and an output evaluator configured to perform a judgment process of judging whether or not the DC voltage is a voltage corresponding to a set value received from the fist controller, and to output a result of the judgment to the first controller. The output evaluator includes a storage for storing correspondence information which shows a correspondence relationship between the set value and a voltage value of the DC voltage outputted from the voltage output unit. The output evaluator performs the judgment process by outputting the correspondence information to the first controller, and receiving a set value determined on the basis of the correspondence information from the first controller.

Power supply device and image formation apparatus

A power-supply device includes: a rectifier circuit configured to output a rectified voltage by rectifying an output from a transformer; a comparator circuit configured to compare a comparison voltage corresponding to an output voltage or an output current that are generated based on the rectified voltage with the indicator voltage and to control an operation of the transformer drive circuit so as to reduce the difference between the comparison voltage and the indicator voltage; a constant voltage element configured to limit the output voltage or the output current by operating as a constant voltage source when the value of the output voltage or the output current reaches a threshold; and a current mirror circuit. The current mirror circuit is configured to lower the indicator voltage by allowing a current proportional to the current flowing through the constant voltage element to flow through the current path.

Power-supply device and image formation apparatus

A power supply apparatus includes an arithmetic unit configured to successively update a N-bit division ratio at every step whose processing timing is managed by a timer, by adding or subtracting of preset data read from a data memory to or from the N-bit division ratio in accordance with a comparative output. An arithmetic unit performs an arithmetic operation to make a feedback data value approach a target data value by a negative feedback control, the arithmetic operation using, as the preset data, data read from the address specified by data with a predetermined bit width of M (M&#x3c;N) extracted from the successively updated N-bit division ratio.

Power supply apparatus and image formation apparatus

A power supply with a digital control circuit generates an output voltage by driving a piezoelectric transducer with an alternating current voltage at a digitally controlled driving frequency. To skip over a spurious frequency, the driving frequency is switched between a first range above the spurious frequency and a second range below the spurious frequency. Within the first and second ranges, the driving frequency is varied in directions that make the output voltage track a target voltage. If the driving frequency arrives at the lower limit of the first range, it jumps to a switchover frequency in the second range. The first range can be used to generate a comparatively low output voltage, and the second range to generate a comparatively high output voltage.

Power supply, image forming device, and piezoelectric transducer control method

A piezoelectric transducer driver configured to drive a piezoelectric transducer for converting an inputted alternating-current voltage, includes: a drive circuit configured to generate the alternating-current voltage to be inputted into the piezoelectric transducer; a frequency controller configured to control a frequency of the alternating-current voltage as a drive frequency to be applied to the piezoelectric transducer; and a pulse generation circuit configured to generate a drive pulse having a switching frequency corresponding to the drive frequency, and to output the drive pulse to the drive circuit. The drive circuit includes a switching element configured to generate the alternating-current voltage by executing a switching operation corresponding to a pulse width of the drive pulse, and the pulse generation circuit changes the pulse width depending on the switching frequency.

Piezoelectric transducer driver, power supply device, and image formation apparatus

A high-voltage power-supply apparatus comprises a controller configured to output a control signal containing a pulse with a variable drive frequency; a switching unit configured to be switched by the control signal and output a drive signal; a piezoelectric transducer having a predetermined resonant frequency, and configured to be driven by the drive signal and output a high-voltage output voltage; a current detector configured to detect an electric current of a load connected to an output side of the piezoelectric transducer and output a current-detection result; and a lower-limit-value setup unit configured to set a frequency lower limit value for the drive frequency of the controller. The controller is configured to vary the frequency lower limit value in accordance with the current-detection result.

Growing community of inventors

Tokyo, Japan

Toru Kosaka