Patents by Inventor Junichi Iwata
Junichi Iwata has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11633950Abstract: An image forming apparatus includes: a piezoelectric element with a common electrode on one side and an individual electrode on another side; a nozzle; and circuitry. The circuitry selects one from drive signals and supplies the one drive signal to the piezoelectric element via the individual electrode, to discharge a droplet through the nozzle to form an image. Each drive signal includes waveform pulses including a main pulse that rises in a slope shape during a rising time and finishes rising at an end time. The circuitry generates the drive signals so that the end time of a less influential drive signal other than a most influential drive signal falls within a range of the rising time of the main pulse of the most influential drive signal; selects the one drive signal based on an image to be formed; and supplies the one drive signal to the piezoelectric element.Type: GrantFiled: March 1, 2021Date of Patent: April 25, 2023Assignee: Ricoh Company Ltd.Inventor: Junichi Iwata
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Patent number: 11207888Abstract: A liquid discharge head includes a nozzle to discharge a liquid, an individual chamber communicating with the nozzle, a supply channel communicating with the individual chamber to supply the liquid to the individual chamber, and a discharge channel communicating with the individual chamber to discharge the liquid in the individual chamber. A fluid resistance of the supply channel is greater than a fluid resistance of the discharge channel.Type: GrantFiled: July 21, 2020Date of Patent: December 28, 2021Assignee: RICOH COMPANY, LTD.Inventors: Junichi Iwata, Takahiro Yoshida, Yukio Otome, Tomoaki Murakami
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Publication number: 20210276326Abstract: An image forming apparatus includes: a piezoelectric element with a common electrode on one side and an individual electrode on another side; a nozzle; and circuitry. The circuitry selects one from drive signals and supplies the one drive signal to the piezoelectric element via the individual electrode, to discharge a droplet through the nozzle to form an image. Each drive signal includes waveform pulses including a main pulse that rises in a slope shape during a rising time and finishes rising at an end time. The circuitry generates the drive signals so that the end time of a less influential drive signal other than a most influential drive signal falls within a range of the rising time of the main pulse of the most influential drive signal; selects the one drive signal based on an image to be formed; and supplies the one drive signal to the piezoelectric element.Type: ApplicationFiled: March 1, 2021Publication date: September 9, 2021Applicant: Ricoh Company Ltd.Inventor: Junichi Iwata
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Patent number: 10864746Abstract: A liquid circulating apparatus includes a circulation route configured to circulate liquid through a liquid ejecting head, the circulation route including: a supply-side tank leading to a supply port of the liquid ejecting head; and a discharge-side tank leading to a discharge port of the liquid ejecting head, wherein the liquid is circulated by setting pressure in the supply-side tank higher than pressure in the discharge-side tank, and a sum of the pressure in the supply-side tank and the pressure in the discharge-side tank is set smaller when initial filling for filling the circulation route with the liquid is performed than when the liquid is circulated.Type: GrantFiled: March 14, 2018Date of Patent: December 15, 2020Assignee: Ricoh Company, Ltd.Inventors: Yukio Otome, Takahiro Yoshida, Takayuki Nakai, Ryuji Yoshida, Junichi Iwata
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Publication number: 20200346457Abstract: A liquid discharge head includes a nozzle to discharge a liquid, an individual chamber communicating with the nozzle, a supply channel communicating with the individual chamber to supply the liquid to the individual chamber, and a discharge channel communicating with the individual chamber to discharge the liquid in the individual chamber. A fluid resistance of the supply channel is greater than a fluid resistance of the discharge channel.Type: ApplicationFiled: July 21, 2020Publication date: November 5, 2020Inventors: Junichi Iwata, Takahiro Yoshida, Yukio Otome, Tomoaki Murakami
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Patent number: 10792920Abstract: A liquid discharge head includes a plurality of nozzles arrayed in a nozzle array direction to discharge a liquid; a plurality of pressure chambers arrayed in the nozzle array direction and communicating with the plurality of nozzles, respectively; and a diaphragm forming a displaceable wall of each of the plurality of pressure chambers. The diaphragm includes a concave portion outside an arrangement region of the plurality of pressure chambers in which the plurality of pressure chambers is arrayed in the nozzle array direction.Type: GrantFiled: May 17, 2019Date of Patent: October 6, 2020Assignee: Ricoh Company, Ltd.Inventors: Junichi Iwata, Yoshitaka Fujinuma, Kanshi Abe, Takayuki Nakai, Koji Kawahara
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Patent number: 10759165Abstract: A liquid discharge head includes a nozzle to discharge a liquid, an individual chamber communicating with the nozzle, a supply channel communicating with the individual chamber to supply the liquid to the individual chamber, and a discharge channel communicating with the individual chamber to discharge the liquid in the individual chamber. A fluid resistance of the supply channel is greater than a fluid resistance of the discharge channel.Type: GrantFiled: February 13, 2018Date of Patent: September 1, 2020Assignee: Ricoh Company, Ltd.Inventors: Junichi Iwata, Takahiro Yoshida, Yukio Otome, Tomoaki Murakami
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Publication number: 20190358953Abstract: A liquid discharge head includes a plurality of nozzles arrayed in a nozzle array direction to discharge a liquid; a plurality of pressure chambers arrayed in the nozzle array direction and communicating with the plurality of nozzles, respectively; and a diaphragm forming a displaceable wall of each of the plurality of pressure chambers. The diaphragm includes a concave portion outside an arrangement region of the plurality of pressure chambers in which the plurality of pressure chambers is arrayed in the nozzle array direction.Type: ApplicationFiled: May 17, 2019Publication date: November 28, 2019Inventors: Junichi IWATA, Yoshitaka FUJINUMA, Kanshi ABE, Takayuki NAKAI, Koji KAWAHARA
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Patent number: 10179452Abstract: A liquid discharge head includes a plurality of nozzles from which liquid is discharged, a plurality of individual-liquid-chambers communicating with the plurality of nozzles, respectively, a plurality of individual-drainage-channels communicating with the plurality of individual-liquid-chambers, respectively, a drainage-side common-liquid-chamber communicating with each of the plurality of individual-drainage-channels, a filter having filter holes and disposed between the plurality of individual-drainage-channels and the drainage-side common-liquid-chamber, and an intermediate-drainage-channel disposed between the filter and the plurality of individual-drainage-channels. The intermediate-drainage-channel faces the filter and communicates with two or more of the plurality of individual-drainage-channels.Type: GrantFiled: December 18, 2017Date of Patent: January 15, 2019Assignee: Ricoh Company, Ltd.Inventors: Masami Iwama, Yukio Otome, Takahiro Yoshida, Takakazu Kihira, Takayuki Nakai, Shiomi Andou, Isamu Suzuki, Ryuji Yoshida, Kanshi Abe, Junichi Iwata, Katsuya Ishii, Toshimichi Odaka
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Publication number: 20180272740Abstract: A liquid circulating apparatus includes a circulation route configured to circulate liquid through a liquid ejecting head, the circulation route including: a supply-side tank leading to a supply port of the liquid ejecting head; and a discharge-side tank leading to a discharge port of the liquid ejecting head, wherein the liquid is circulated by setting pressure in the supply-side tank higher than pressure in the discharge-side tank, and a sum of the pressure in the supply-side tank and the pressure in the discharge-side tank is set smaller when initial filling for filling the circulation route with the liquid is performed than when the liquid is circulated.Type: ApplicationFiled: March 14, 2018Publication date: September 27, 2018Applicant: Ricoh Company, Ltd.Inventors: Yukio OTOME, Takahiro YOSHIDA, Takayuki NAKAI, Ryuji YOSHIDA, Junichi IWATA
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Publication number: 20180272709Abstract: A liquid discharge head includes a nozzle to discharge a liquid, an individual chamber communicating with the nozzle, a supply channel communicating with the individual chamber to supply the liquid to the individual chamber, and a discharge channel communicating with the individual chamber to discharge the liquid in the individual chamber. A fluid resistance of the supply channel is greater than a fluid resistance of the discharge channel.Type: ApplicationFiled: February 13, 2018Publication date: September 27, 2018Inventors: Junichi IWATA, Takahiro YOSHIDA, Yukio OTOME, Tomoaki MURAKAMI
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Patent number: 10081182Abstract: A liquid discharge head includes a head body, a wiring member, a connector, and a protector. The head body discharges liquid. The wiring member transmits a signal to the head body. The connector is disposed at the wiring member to connect the wiring member to the head body. The protector covers the head body and the connector. The head body includes a fitting portion. The protector includes a fitting portion to fit the fitting portion of the head body in a fitting direction. The connector is disposed more backward than a leading end of the fitting portion of the protector in the fitting direction.Type: GrantFiled: February 13, 2017Date of Patent: September 25, 2018Assignee: Ricoh Company, Ltd.Inventors: Atsushi Kikuchi, Yoshitaka Fujinuma, Junichi Iwata
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Publication number: 20180194135Abstract: A liquid discharge head includes a plurality of nozzles from which liquid is discharged, a plurality of individual-liquid-chambers communicating with the plurality of nozzles, respectively, a plurality of individual-drainage-channels communicating with the plurality of individual-liquid-chambers, respectively, a drainage-side common-liquid-chamber communicating with each of the plurality of individual-drainage-channels, a filter having filter holes and disposed between the plurality of individual-drainage-channels and the drainage-side common-liquid-chamber, and an intermediate-drainage-channel disposed between the filter and the plurality of individual-drainage-channels. The intermediate-drainage-channel faces the filter and communicates with two or more of the plurality of individual-drainage-channels.Type: ApplicationFiled: December 18, 2017Publication date: July 12, 2018Inventors: Masami IWAMA, Yukio OTOME, Takahiro YOSHIDA, Takakazu KIHIRA, Takayuki NAKAI, Shiomi ANDOU, Isamu SUZUKI, Ryuji YOSHIDA, Kanshi ABE, Junichi IWATA, Katsuya ISHll, Toshimichi ODAKA
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Publication number: 20170232741Abstract: A liquid discharge head includes a head body, a wiring member, a connector, and a protector. The head body discharges liquid. The wiring member transmits a signal to the head body. The connector is disposed at the wiring member to connect the wiring member to the head body. The protector covers the head body and the connector. The head body includes a fitting portion. The protector includes a fitting portion to fit the fitting portion of the head body in a fitting direction. The connector is disposed more backward than a leading end of the fitting portion of the protector in the fitting direction.Type: ApplicationFiled: February 13, 2017Publication date: August 17, 2017Applicant: Ricoh Company, Ltd.Inventors: Atsushi Kikuchi, Yoshitaka Fujinuma, Junichi Iwata
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Patent number: 9322958Abstract: Silicone hydrogel contact lenses are provided which have reduced modulus and contact angle properties, and which have acceptable wettabilities for use in daily wear and extended or continuous wear applications.Type: GrantFiled: January 14, 2013Date of Patent: April 26, 2016Assignee: CooperVision International Holding Company, LPInventors: Arthur Back, Junichi Iwata, Tsuneo Hoki, Seiichiro Ikawa
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Publication number: 20150219795Abstract: Silicone hydrogel contact lenses are provided which have reduced modulus and contact angle properties, and which have acceptable wettabilities for use in daily wear and extended or continuous wear applications.Type: ApplicationFiled: January 14, 2013Publication date: August 6, 2015Inventors: Arthur Back, Junichi Iwata, Tsuneo Hoki, Seiichirou Ikawa
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Patent number: 8637621Abstract: A hydrogel soft contact lens which is superior in extended-wearability, lens movement, wear comfort, and which does not adhere to a cornea when worn is provided. The lens provided can be a silicone hydrogel contact lens which contains units of hydrophilic siloxane monomers and amide-group-containing monomers having an N-vinyl group.Type: GrantFiled: December 3, 2010Date of Patent: January 28, 2014Assignee: CooperVision International Holding Company, LPInventors: Junichi Iwata, Tsuneo Hoki, Seiichirou Ikawa
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Patent number: 8614261Abstract: Ophthalmically compatible contact lenses include lens bodies configured for placement on a cornea of an animal or human eye. The lens bodies are made of a hydrophilic silicon-containing polymeric material. The lens bodies have oxygen permeabilities, water content, surface wettabilities, flexibilities, and/or designs to be worn by a lens wearer even during sleep. The present lenses can be worn on a daily basis, including overnight, or can be worn for several days, such as about thirty days, without requiring removal or cleaning.Type: GrantFiled: March 26, 2012Date of Patent: December 24, 2013Assignee: CooperVision International Holding Company LPInventors: Junichi Iwata, Tsuneo Hoki, Seiichirou Ikawa, Arthur Back
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Patent number: 8524850Abstract: PROBLEM TO BE SOLVED To provide an ophthalmic lens, which can be more safely worn, that is, to provide a material, which is transparent and has high oxygen permeability and a high hydrophilic property, and to provide a novel monomer to be a raw material thereof. SOLUTION A hydrophilic polysiloxane macromonomer contains polyoxyethylene as a hydrophilic side chains in a polysiloxane main chain, wherein transparency, oxygen permeability, and hydrophilic properties of the material are controlled by regulating the length of the polysiloxane main chain, the length of the hydrophilic polyoxyethylene side chains, and the number of the side chains.Type: GrantFiled: March 5, 2012Date of Patent: September 3, 2013Assignee: CooperVision International Holding Company, LPInventors: Hiroyuki Ueyama, Seiichiro Ikawa, Junichi Iwata
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Publication number: 20120252925Abstract: Ophthalmically compatible contact lenses include lens bodies configured for placement on a cornea of an animal or human eye. The lens bodies are made of a hydrophilic silicon-containing polymeric material. The lens bodies have oxygen permeabilities, water content, surface wettabilities, flexibilities, and/or designs to be worn by a lens wearer even during sleep. The present lenses can be worn on a daily basis, including overnight, or can be worn for several days, such as about thirty days, without requiring removal or cleaning.Type: ApplicationFiled: March 26, 2012Publication date: October 4, 2012Applicant: COOPERVISION INTERNATIONAL HOLDING COMPANY, LPInventors: Junichi Iwata, Tsuneo Hoki, Seiichirou Ikawa, Arthur Back