Hirofumi Nakagawa
Hirofumi Nakagawa, Toyokawa-Shi JP
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20100150601 | CLEANING DEVICE FOR INTERMEDIATE TRANSFERRING MEMBER AND IMAGE-FORMING APPARATUS - A cleaning device for an intermediate transferring member, comprising: | 06-17-2010 |
20100150602 | CLEANING DEVICE FOR INTERMEDIATE TRANSFERRING MEMBER AND IMAGE-FORMING APPARATUS EQUIPPED WITH THE SAME - A cleaning device for an intermediate transferring member, comprising: | 06-17-2010 |
Hirofumi Nakagawa, Samukawa JP
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20110188108 | OPTICAL MODULE - To achieve a size-reduction of an optical module having a circuit that generates a high-frequency clock signal for controlling optical modulation by an optical modulator and to suppress radiation of electromagnetic waves from the optical module. A through-hole via is formed on a multilayer printed circuit board so as to be insulated from a plurality of grounded wiring layers by an anti-pad. A coaxial connector and an intensity modulation control IC that generates a high-frequency clock signal are provided on the multilayer printed circuit board. The high-frequency clock signal is input to the coaxial connector through a micro-strip line formed on the multilayer printed circuit board. An open stub connected to the through-hole via is provided on a wiring layer between a first wiring layer and a second wiring layer among the plurality of wiring layers. | 08-04-2011 |
Hirofumi Nakagawa, Kouza-Gun JP
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20120301153 | OPTICAL OUTPUT MODULE, OPTICAL TRANSCEIVER, AND OPTICAL TRANSMISSION SYSTEM - The I phase modulator modulates a phase based on the bias voltage in which a first modulation signal and a first pilot signal are inherent and the Q phase modulator modulates a phase based on the bias voltage in which a second pilot signal different from the first pilot signal and a second modulation signal are inherent. A time-average power synchronous detection unit detects an optical power at a timing at which the positivity and negativity of the voltages of both pilot signals become the same, and an optical power when the positivity and negativity of the voltages of both pilot signals are opposite. The bias voltage control unit controls the bias voltage so that the difference between both the optical powers becomes small based on the detection result of the time-average power synchronous detection unit. | 11-29-2012 |
Hirofumi Nakagawa, Ibaraki JP
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20140057050 | ORGANIC RUTHENIUM COMPOUND FOR CHEMICAL VAPOR DEPOSITION RAW MATERIAL AND PRODUCTION METHOD FOR SAID ORGANIC RUTHENIUM COMPOUND - The present invention is an organoruthenium compound for a chemical vapor deposition raw material, including dodecacarbonyl triruthenium represented by the following chemical formula, wherein the iron (Fe) concentration is 1 ppm or less. The DCR in the present invention can be produced by obtaining crude DCR by directly carbonylating ruthenium through allowing a ruthenium salt and carbon monoxide to react with each other and by purifying the crude DCR by a sublimation method. In the synthesis step, the concentration of Fe in the obtained crude DCR is preferably set at 10 ppm or less. | 02-27-2014 |
Hirofumi Nakagawa, Takatsuki-Shi JP
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20140125004 | PAPER CONVEYING DEVICE, IMAGE FORMING APPARATUS, AND PUSH-IN AMOUNT ADJUSTING METHOD - A paper conveying device includes an intermediate transfer member and a paper conveying member driven so as to rotate at the same rotational speed, and an adjusting device. On an outer peripheral surface of the intermediate transfer member, an elastic layer is provided. An axes distance between the intermediate transfer member and the paper conveying member is adjusted by the adjusting device so that drive torque for rotating the intermediate transfer member and the paper conveying member at the same rotational speed becomes smaller than a target set value. Accordingly, occurrence of the shear is suppressed without changing a rotational speed ratio of rollers arranged opposite to each other. | 05-08-2014 |
20140321892 | WET-TYPE IMAGE FORMATION APPARATUS - A wet-type image formation apparatus includes: an intermediate transfer body that carries a toner image including toner particles, which are charged to have a first polarity, and a carrier liquid; a transferring roller that transfers a toner image onto a transfer surface of a recording medium; a charging device that charges the transfer surface to have a second polarity opposite to the first polarity; and a fixing mechanism that fixes the toner image. The fixing mechanism includes a noncontact heating device. The noncontact heating device forms the toner particles into a film such that the toner particles and the carrier liquid are separated from each other by heating the toner image when the toner particles charged to the first polarity is electrostatically adsorbed onto the transfer surface charged to have the second polarity. The film of the toner particles is fixed onto the transfer surface. | 10-30-2014 |
Hirofumi Nakagawa, Tsukuba-Shi, Ibaraki JP
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20150344510 | PRODUCTION METHOD FOR DODECACARBONYL TRIRUTHENIUM - The present invention is a method for producing dodecacarbonyl triruthenium (DCR) including a process of carbonylating ruthenium chloride with carbon monoxide, in which an amine is added to a reaction system at 0.8 molar equivalent or more with respect to chlorine of the ruthenium chloride and the carbonylation is conducted at a reaction temperature of 50 to 100° C. and a reaction pressure of 0.2 to 0.9 MPa. According to the present invention, it is possible to produce dodecacarbonyl triruthenium having less residual impurity metals without applying a reaction condition of a high pressure. | 12-03-2015 |