Ricoh Company, Ltd.

Akira Yashiro

Kunihiro Komai

Takayuki Kawamoto

Takashi Hayashi

Hiroki Okada

Motohiro Kawanabe

Hiromitsu Hatano

Kenji Sueyoshi

A heating device includes: a heater; and a power distribution controller. The heater heats a predetermined heating target. The power distribution controller controls supply of AC power to the heater. The power distribution controller performs power distribution to the heater in units of AC half wave, and controls the power supply to the heater in accordance with power distribution control patterns respectively corresponding to a first time period as a power distribution start period, a third time period as a power distribution stop period, and a second time period between the first time period and the third time period.

Heating device and image forming apparatus

An aspect of the present invention provides an image forming apparatus including: a photosensitive element where a latent image is formed and developed into a toner image; an image carrier; an intermediate transfer driving roller that drives the image carrier; a primary transfer roller for transferring the toner image from the photosensitive element to the image carrier; a secondary transfer roller for secondary transfer of the toner image from the image carrier to a medium; a bias applying unit that applies, as a secondary transfer bias, a first bias and a second bias to the intermediate transfer driving roller and the secondary transfer roller, respectively; and a fixing unit that fixes the toner image onto the medium. The first bias is lower than a minimum voltage at which discharge to the primary transfer roller can occur. The second bias depends on the first bias and is opposite in polarity therefrom.

Image forming apparatus and image forming method

A power supply circuit includes a voltage regulator to which a first high voltage is supplied, to operate at constant voltage and regulate the supplied first high voltage, and a first rectifier circuit to which the first high voltage is supplied, connected in parallel to the voltage regulator, to rectify the supplied first high voltage for output as a first DC voltage. When the first high voltage is a pseudo-alternating-current (AC) voltage consisting of two types of high voltages that alternate, the voltage regulator regulates each of the two different types of the voltages to output a desired pseudo-AC voltage.

Power supply circuit, image forming apparatus incorporating same, and power supply method to supply voltage to image forming apparatus

An image forming apparatus having a fixing part fixing a toner image onto a recording medium by heating it, includes an ambient temperature predicting part predicting an ambient temperature from a fixing temperature rising period of time taken until the fixing part reaches a certain temperature; a member temperature predicting part predicting a member temperature of a member from the predicted ambient temperature and an operating state of the image forming apparatus; a cumulative-used-service-lifetime calculating part calculating a current cumulative used service lifetime from the predicted member temperature, the operating state of the image forming apparatus and an immediately preceding cumulative used service lifetime; a limit-of-usable-period-of-time calculating part calculating a limit of usable period of time by subtracting the calculated current cumulative used service lifetime from a service lifetime of the member; and a reporting part reporting the calculated limit of usable period of time.

Image forming apparatus and image forming control method which calculates a remaining lifetime

A power source unit includes an AC/DC converter to convert alternating current to direct current output, an auxiliary power source storing electric power, a load detector to detect a high/low level of direct current output to a DC-using load device from the AC/DC converter, and a power supply controller. When load to be required exceeds alternating current power source limits, the power supply controller shuts down output of direct current from the AC/DC converter, and instead uses the auxiliary power source to supply power to the DC-using load device. When the load to be required is within alternating current power source limits, the power supply controller uses the AC/DC converter to supply power to the DC-using load device while the load detector detects high voltage for the DC-using load device, and the power supply controller uses the auxiliary power source to supply power to the DC-using load device and shuts down the AC/DC converter while the load detector detects low voltage for the DC-using load device.

Power source unit and image forming apparatus

A power supply apparatus includes an error detecting unit configured to perform error detection to detect that an output node and another node are placed in a short-circuit state or open-circuit state, a condition change detecting unit configured to detect a change in an external condition, and an operating-point changing unit configured to change an operating point of the error detection performed by the error detecting unit in response to the change detected by the condition change detecting unit.

Power supply apparatus and image forming apparatus

A device package, such as a BGA, to be mounted on a printed wiring board (PWB) is disclosed. The bottom electrodes of the device package are arranged in an array such that intervals between the edges of the bottom electrodes become different from place to place. The intervals may be set wider at the peripheral positions of the bottom electrodes. The PWB includes pads that are located at positions corresponding to the bottom electrodes.

Device package, a printed wiring board, and an electronic apparatus with efficiently spaced bottom electrodes including intervals between bottom electrodes of different lengths

A printed circuit board wiring system including a printed wiring circuit board having a plurality of conductive layers, at least one electronic part mounted on one side of the circuit board and configured to output signals via signal lines, and an auxiliary wiring package mounted on the other side of the circuit board and including a plurality of conductive layers configured to allow the signal lines from the electronic part to pass therethrough so as to be connected to the circuit board. Further, a first set of signal lines are immediately drawn from the at least one electronic part using half of the plurality of conductive layers of the circuit board without passing through the auxiliary wiring package, and a second set of signal lines are drawn from the at least one electronic part through the circuit board and the auxiliary wiring package using the other half of the plurality of conductive layers of the circuit board.

Wiring layout of auxiliary wiring package and printed circuit wiring board

A complementary wiring package including a package, a first set of external pins mounted in a central region on a top surface of the package in a vertical direction and connected to a plurality of respectively corresponding through holes, a second set of external pins being mounted in a perimeter region on a top surface of the package in a vertical direction and connected to printed wiring of a printed wiring board, and a plurality of internal lines that connect the first set of external pins to the second set of external pins. The complementary wiring package does not require a semi-conductor integrated circuit and is capable of being coupled with an semi-conductor integrated circuit package via the plurality of respectively corresponding through holes of the printed wiring board which is sandwiched between the complementary wiring package and the semi-conductor integrated circuit package.

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Osaka, Japan

Akira Yashiro