Patents by Inventor Kyuhachiro Iwasaki
Kyuhachiro Iwasaki 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: 7533950Abstract: A liquid jet recording apparatus is provided in which liquid droplets are jetted from liquid jetting orifices.Type: GrantFiled: January 25, 2008Date of Patent: May 19, 2009Assignee: Ricoh Company, Ltd.Inventors: Takuro Sekiya, Kyuhachiro Iwasaki
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Publication number: 20080186347Abstract: An ink jet recording method includes the steps of inputting a set of driving pulses to a heater element so that the heater element is repeatedly activated by the driving pulses, repeatedly generating a bubble in ink in an ink path in accordance with repeated activation of the heater element, and separately jetting ink droplets from an ink jetting orifice due to the bubble repeatedly generated in the ink, a number of the ink droplets being equal to a number of the driving pulses input as a set to the heater element, the ink droplets jetted from the ink jetting orifice forming a single dot on a recording medium, wherein a time interval at which the driving pulses are input to the heater element is equal to or greater than 4 T, T being a time period from a time at which the inputting of the pulses to the heater element starts to a time at which the bubble reaches a maximum size, and each ink droplet is a slender pillar so that a length of each ink droplet is at least three times as great as a diameter thereof.Type: ApplicationFiled: January 25, 2008Publication date: August 7, 2008Applicant: Ricoh Company, LtdInventors: Takuro Sekiya, Kyuhachiro Iwasaki
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Patent number: 7347518Abstract: An ink jet recording head is configured to jet small ink droplets for forming high-quality dot images. The ink jet recording head comprises ink jetting orifices from which ink droplets are jetted, and ink paths connected to said ink jet orifices. The ink paths are filled with ink and equipped with energy applying members for applying energy to the ink in said ink paths on demand so that ink droplets are jetted from said ink jetting orifices.Type: GrantFiled: June 21, 2005Date of Patent: March 25, 2008Assignee: Ricoh Company, Ltd.Inventors: Takuro Sekiya, Kyuhachiro Iwasaki
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Patent number: 7341322Abstract: Liquid jet heads, methods and apparatuses are provided for jetting liquid droplets to a receiving medium and forming a dot pattern on a receiving medium.Type: GrantFiled: June 21, 2005Date of Patent: March 11, 2008Inventors: Takuro Sekiya, Kyuhachiro Iwasaki
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Patent number: 6991309Abstract: Liquid jet recording apparatuses and liquid jet recording methods are provided. Ink droplets are jetted from ink jetting orifices. A cross sectional area of each of the ink jetting orifices is equal to or less than 500 ?m2. A frequency with which the ink droplets are jetted is controlled to fall within a range from 8 KHz to 40 KHz. A flying velocity of each ink droplet is equal to or greater than 5.2 m/sec. A number of ink droplets which are jetted to form each pixel of the image formed on the recording medium is controlled based on the image data. Each of the ink jetting orifices has a size such that when an amount of ink is jetted, adjacent pixels are separated from each other on the recording medium when each pixel is formed of a single ink droplet, thereby forming a gray image. The image becomes darker based on a number of ink droplets jetted to form each pixel.Type: GrantFiled: June 28, 2004Date of Patent: January 31, 2006Assignee: Ricoh Company, Ltd.Inventors: Takuro Sekiya, Kyuhachiro Iwasaki
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Publication number: 20050231539Abstract: An ink jet recording method includes the steps of inputting a set of driving pulses to a heater element so that the heater element is repeatedly activated by the driving pulses, repeatedly generating a bubble in ink in an ink path in accordance with repeated activation of the heater element, and separately jetting ink droplets from an ink jetting orifice due to the bubble repeatedly generated in the ink, a number of the ink droplets being equal to a number of the driving pulses input as a set to the heater element, the ink droplets jetted from the ink jetting orifice forming a single dot on a recording medium, wherein a time interval at which the driving pulses are input to the heater element is equal to or greater than 4T, T being a time period from a time at which the inputting of the pulses to the heater element starts to a time at which the bubble reaches a maximum size, and each ink droplet is a slender pillar so that a length of each ink droplet is at least three times as great as a diameter thereof.Type: ApplicationFiled: June 21, 2005Publication date: October 20, 2005Inventors: Takuro Sekiya, Kyuhachiro Iwasaki
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Publication number: 20050231559Abstract: An ink jet recording method includes the steps of inputting a set of driving pulses to a heater element so that the heater element is repeatedly activated by the driving pulses, repeatedly generating a bubble in ink in an ink path in accordance with repeated activation of the heater element, and separately jetting ink droplets from an ink jetting orifice due to the bubble repeatedly generated in the ink, a number of the ink droplets being equal to a number of the driving pulses input as a set to the heater element, the ink droplets jetted from the ink jetting orifice forming a single dot on a recording medium, wherein a time interval at which the driving pulses are input to the heater element is equal to or greater than 4T, T being a time period from a time at which the inputting of the pulses to the heater element starts to a time at which the bubble reaches a maximum size, and each ink droplet is a slender pillar so that a length of each ink droplet is at least three times as great as a diameter thereof.Type: ApplicationFiled: June 21, 2005Publication date: October 20, 2005Inventors: Takuro Sekiya, Kyuhachiro Iwasaki
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Publication number: 20040239709Abstract: An ink jet recording method includes the steps of inputting a set of driving pulses to a heater element so that the heater element is repeatedly activated by the driving pulses, repeatedly generating a bubble in ink in an ink path in accordance with repeated activation of the heater element, and separately jetting ink droplets from an ink jetting orifice due to the bubble repeatedly generated in the ink, a number of the ink droplets being equal to a number of the driving pulses input as a set to the heater element, the ink droplets jetted from the ink jetting orifice forming a single dot on a recording medium, wherein a time interval at which the driving pulses are input to the heater element is equal to or greater than 4T, T being a time period from a time at which the inputting of the pulses to the heater element starts to a time at which the bubble reaches a maximum size, and each ink droplet is a slender pillar so that a length of each ink droplet is at least three times as great as a diameter thereof.Type: ApplicationFiled: June 28, 2004Publication date: December 2, 2004Inventors: Takuro Sekiya, Kyuhachiro Iwasaki
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Patent number: 6789866Abstract: An ink jet recording method includes the steps of inputting a set of driving pulses to a heater element so that the heater element is repeatedly activated by the driving pulses, repeatedly generating a bubble in ink in an ink path in accordance with repeated activation of the heater element, and separately jetting ink droplets from an ink jetting orifice due to the bubble repeatedly generated in the ink, a number of the ink droplets being equal to a number of the driving pulses input as a set to the heater element, the ink droplets jetted from the ink jetting orifice forming a single dot on a recording medium, wherein a time interval at which the driving pulses are input to the heater element is equal to or greater than 4T, T being a time period from a time at which the inputting of the pulses to the heater element starts to a time at which the bubble reaches a maximum size, and each ink droplet is a slender pillar so that a length of each ink droplet is at least three times as great as a diameter thereof.Type: GrantFiled: March 14, 2003Date of Patent: September 14, 2004Assignee: Ricoh Company Ltd.Inventors: Takuro Sekiya, Kyuhachiro Iwasaki
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Publication number: 20030164865Abstract: An ink jet recording method includes the steps of inputting a set of driving pulses to a heater element so that the heater element is repeatedly activated by the driving pulses, repeatedly generating a bubble in ink in an ink path in accordance with repeated activation of the heater element, and separately jetting ink droplets from an ink jetting orifice due to the bubble repeatedly generated in the ink, a number of the ink droplets being equal to a number of the driving pulses input as a set to the heater element, the ink droplets jetted from the ink jetting orifice forming a single dot on a recording medium, wherein a time interval at which the driving pulses are input to the heater element is equal to or greater than 4T, T being a time period from a time at which the inputting of the pulses to the heater element starts to a time at which the bubble reaches a maximum size, and each ink droplet is a slender pillar so that a length of each ink droplet is at least three times as great as a diameter thereof.Type: ApplicationFiled: March 14, 2003Publication date: September 4, 2003Inventors: Takuro Sekiya, Kyuhachiro Iwasaki
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Patent number: 6568778Abstract: An ink jet recording method includes the steps of inputting a set of driving pulses to a heater element so that the heater element is repeatedly activated by the driving pulses, repeatedly generating a bubble in ink in an ink path in accordance with repeated activation of the heater element, and separately jetting ink droplets from an ink jetting orifice due to the bubble repeatedly generated in the ink, a number of the ink droplets being equal to a number of the driving pulses input as a set to the heater element, the ink droplets jetted from the ink jetting orifice forming a single dot on a recording medium, wherein a time interval at which the driving pulses are input to the heater element is equal to or greater than 4T, T being a time period from a time at which the inputting of the pulses to the heater element starts to a time at which the bubble reaches a maximum size, and each ink droplet is a slender pillar so that a length of each ink droplet is at least three times as great as a diameter thereof.Type: GrantFiled: November 2, 2000Date of Patent: May 27, 2003Assignee: Ricoh Company, Ltd.Inventors: Takuro Sekiya, Kyuhachiro Iwasaki
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Patent number: 6227639Abstract: An ink jet recording method includes the steps of inputting a set of driving pulses to a heater element so that the heater element is repeatedly activated by the driving pulses, repeatedly generating a bubble in ink in an ink path in accordance with repeated activation of the heater element, and separately jetting ink droplets from an ink jetting orifice due to the bubble repeatedly generated in the ink, a number of the ink droplets being equal to a number of the driving pulses input as a set to the heater element, the ink droplets jetted from the ink jetting orifice forming a single dot on a recording medium, wherein a time interval at which the driving pulses are input to the heater element is equal to or greater than 4T, T being a time period from a time at which the inputting of the pulses to the heater element starts to a time at which the bubble reaches a maximum size, and each ink droplet is a slender pillar so that a length of each ink droplet is at least three times as great as a diameter thereof.Type: GrantFiled: February 25, 1998Date of Patent: May 8, 2001Assignee: Ricoh Company, Ltd.Inventors: Takuro Sekiya, Kyuhachiro Iwasaki
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Patent number: 6193348Abstract: A liquid jet recording apparatus for jetting ink droplets to a recording medium in accordance with image data on demand so that an image having pixels corresponding to the image data is formed on the recording medium. The liquid jet recording apparatus includes ink jetting orifices from which ink droplets are jetted. An area of each of ink jetting orifices is equal to or less than 500 &mgr;m2. Control means controls a frequency with which the ink droplets are jetted to fall within a range from 8 KHz to 40 KHz and a number of ink droplets for each pixel of the image formed on the recording medium based on the image data under a condition in which the number of ink droplets is equal to or less than twenty.Type: GrantFiled: February 25, 1998Date of Patent: February 27, 2001Assignee: Ricoh Company, Ltd.Inventors: Takuro Sekiya, Kyuhachiro Iwasaki
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Patent number: 6039425Abstract: An ink jet recording method includes the steps of inputting a set of driving pulses to a heater element so that the heater element is repeatedly activated by the driving pulses, repeatedly generating a bubble in ink in an ink path in accordance with repeated activation of the heater element, and separately jetting ink droplets from an ink jetting orifice due to the bubble repeatedly generated in the ink, a number of the ink droplets being equal to a number of the driving pulses input as a set to the heater element, the ink droplets jetted from the ink jetting orifice forming a single dot on a recording medium, wherein a time interval at which the driving pulses are input to the heater element is equal to or greater than 4T, T being a time period from a time at which the inputting of the pulses to the heater element starts to a time at which the bubble reaches a maximum size, and each ink droplet is a slender pillar so that a length of each ink droplet is at least three times as great as a diameter thereof.Type: GrantFiled: March 19, 1997Date of Patent: March 21, 2000Assignee: Ricoh Company, Ltd.Inventors: Takuro Sekiya, Kyuhachiro Iwasaki
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Patent number: 5877786Abstract: An ink jet recording method includes the steps of inputting a set of driving pulses to a heater element so that the heater element is repeatedly activated by the driving pulses, repeatedly generating a bubble in ink in an ink path in accordance with repeated activation of the heater element, and separately jetting ink droplets from an ink jetting orifice due to the bubble repeatedly generated in the ink, a number of the ink droplets being equal to a number of the driving pulses input as a set to the heater element, the ink droplets jetted from the ink jetting orifice forming a single dot on a recording medium, wherein a time interval at which the driving pulses are input to the heater element is equal to or greater than 4T, T being a time period from a time at which the inputting of the pulses to the heater element starts to a time at which the bubble reaches a maximum size, and each ink droplet is a slender pillar so that a length of each ink droplet is at least three times as great as a diameter thereof.Type: GrantFiled: October 29, 1996Date of Patent: March 2, 1999Assignee: Ricoh Company, Ltd.Inventors: Takuro Sekiya, Kyuhachiro Iwasaki
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Patent number: 5729257Abstract: An ink jet recording method includes the steps of inputting a set of driving pulses to a heater element so that the heater element is repeatedly activated by the driving pulses, repeatedly generating a bubble in ink in an ink path in accordance with repeated activation of the heater element, and separately jetting ink droplets from an ink jetting orifice due to the bubble repeatedly generated in the ink, a number of the ink droplets being equal to a number of the driving pulses input as a set to the heater element, the ink droplets jetted from the ink jetting orifice forming a single dot on a recording medium, wherein a time interval at which the driving pulses are input to the heater element is equal to or greater than 4T, T being a time period from a time at which the inputting of the pulses to the heater element starts to a time at which the bubble reaches a maximum size, and each ink droplet is a slender pillar so that a length of each ink droplet is at least three times as great as a diameter thereof.Type: GrantFiled: June 7, 1995Date of Patent: March 17, 1998Assignee: Ricoh Company, Ltd.Inventors: Takuro Sekiya, Kyuhachiro Iwasaki
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Patent number: 5657060Abstract: An ink jet recording method includes the steps of inputting a set of driving pulses to a heater element so that the heater element is repeatedly activated by the driving pulses, repeatedly generating a bubble in ink in an ink path in accordance with repeated activation of the heater element, and separately jetting ink droplets from an ink jetting orifice due to the bubble repeatedly generated in the ink, a number of the ink droplets being equal to a number of the driving pulses input as a set to the heater element, the ink droplets jetted from the ink jetting orifice forming a single dot on a recording medium, wherein a time interval at which the driving pulses are input to the heater element is equal to or greater than 4T, T being a time period from a time at which the inputting of the pulses to the heater element starts to a time at which the bubble reaches a maximum size, and each ink droplet is a slender pillar so that a length of each ink droplet is at least three times as great as a diameter thereof.Type: GrantFiled: June 7, 1995Date of Patent: August 12, 1997Assignee: Ricoh Company, Ltd.Inventors: Takuro Sekiya, Kyuhachiro Iwasaki
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Patent number: 5610637Abstract: An ink jet recording method includes the steps of inputting a set of driving pulses to a heater element so that the heater element is repeatedly activated by the driving pulses, repeatedly generating a bubble in ink in an ink path in accordance with repeated activation of the heater element, and separately jetting ink droplets from an ink jetting orifice due to the bubble repeatedly generated in the ink, a number of the ink droplets being equal to a number of the driving pulses input as a set to the heater element, the ink droplets jetted from the ink jetting orifice forming a single dot on a recording medium, wherein a time interval at which the driving pulses are input to the heater element is equal to or greater than 4T, T being a time period from a time at which the inputting of the pulses to the heater element starts to a time at which the bubble reaches a maximum size, and each ink droplet is a slender pillar so that a length of each ink droplet is at least three times as great as a diameter thereof.Type: GrantFiled: September 27, 1993Date of Patent: March 11, 1997Assignee: Ricoh Company, Ltd.Inventors: Takuro Sekiya, Kyuhachiro Iwasaki
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Patent number: 4990939Abstract: A bubble jet printer head comprises a base plate, an ink chamber provided on the phase plate, a device for supplying ink to the ink chamber, an ink passage provided on the base plate from the ink chamber to an orifice at a front end, and a heating element at the ink passage for heating the ink to form a bubble.Type: GrantFiled: August 24, 1989Date of Patent: February 5, 1991Assignee: Ricoh Company, Ltd.Inventors: Takuro Sekiya, Kyuhachiro Iwasaki, Takashi Kimura, Tomoaki Nakano
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Patent number: 4800398Abstract: An ink-jet printer includes an ink-jet head assembly which has a modular structure. The head assembly includes a generally bathtub-shaped bottom case in which an ink head for ejecting a series of charged ink droplets is mounted and a pair of top and bottom deflection electrodes is also mounted. The head assembly also includes a similarly bathtub-shaped top case which is mounted on the bottom case upside down to define a substantially enclosed space therebetween. The ink head is supported so as to be adjustable in orientation. And, one end of the ink head is supported as a pivotal point so that the other free end may be oriented in any desired direction. In another structure, a print head assembly is detachably mounted on a carriage and the print head assembly includes an inner ink mist absorbing member formed with a slit and formed from a metal. A carriage cover is detachably mounted on the carriage to cover the print head assembly set in position.Type: GrantFiled: November 13, 1987Date of Patent: January 24, 1989Assignee: Ricoh Company, Ltd.Inventors: Osamu Naruse, Chuji Ishikawa, Sadao Kakeno, Kyuhachiro Iwasaki