Patents by Inventor Yoshiko Hamada
Yoshiko Hamada 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: 7593665Abstract: There is described an image forming apparatus equipped with a cleaning unit to clean a belt-type transfer member. The cleaning unit includes: a conductive opposing roller that contacts an inner surface of the intermediate transfer member; a first conductive brush member and a second conductive brush member, both of which are pressed against the conductive opposing roller while putting the intermediate transfer member between them; a cleaning-voltage applying power source to apply a cleaning voltage having a polarity opposite to that of the residual toner onto the first conductive brush member; and an opposing-roller potential controlling unit to control an electric potential state of the conductive opposing roller, so that an electric potential difference, between the first conductive brush member and the conductive opposing roller at a time when the secondary transferring unit is deactivated, is larger than that at a time when the primary transferring unit is activated.Type: GrantFiled: July 3, 2008Date of Patent: September 22, 2009Assignee: Konica Minolta Business Technologies, Inc.Inventors: Shuta Hamada, Akira Hamada, legal representative, Yoshiko Hamada, legal representative, Takenobu Kimura, Yotaro Sato
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Patent number: 7486901Abstract: The invention prevents the phenomenon of occurrence of toner scattering or density fluctuations by changing the appropriate transfer conditions according to the toner charge of the toner images formed on an intermediate image transfer member. The density of toner images formed under prescribed image forming conditions on an intermediate image transfer member is detected, the toner charge is obtained from the detected density, and the pre-transfer charging section is controlled according to the obtained toner charge.Type: GrantFiled: November 22, 2005Date of Patent: February 3, 2009Assignee: Konica Minolta Business Technologies, Inc.Inventors: Akira Hamada, legal representative, Yoshiko Hamada, legal representative, Takenobu Kimura, Yotaro Sato, Shuta Hamada
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Publication number: 20080273891Abstract: There is described an image forming apparatus equipped with a cleaning unit to clean a belt-type transfer member. The cleaning unit includes: a conductive opposing roller that contacts an inner surface of the intermediate transfer member; a first conductive blush member and a second conductive blush member, both of which are pressed against the conductive opposing roller while putting the intermediate transfer member between them; a cleaning-voltage applying power source to apply a cleaning voltage having a polarity opposite to that of the residual toner onto the first conductive blush member; and an opposing-roller potential controlling unit to control an electric potential state of the conductive opposing roller, so that an electric potential difference, between the first conductive blush member and the conductive opposing roller at a time when the secondary transferring unit is deactivated, is larger than that at a time when the primary transferring unit is activated.Type: ApplicationFiled: July 3, 2008Publication date: November 6, 2008Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Shuta Hamada, Akira Hamada, Yoshiko Hamada, Takenobu Kimura, Yotaro Sato
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Patent number: 7444098Abstract: There is described an image forming apparatus equipped with a cleaning unit to clean a belt-type transfer member. The cleaning unit includes: a conductive opposing roller that contacts an inner surface of the intermediate transfer member; a first conductive blush member and a second conductive blush member, both of which are pressed against the conductive opposing roller while putting the intermediate transfer member between them; a cleaning-voltage applying power source to apply a cleaning voltage having a polarity opposite to that of the residual toner onto the first conductive blush member; and an opposing-roller potential controlling unit to control an electric potential state of the conductive opposing roller, so that an electric potential difference, between the first conductive blush member and the conductive opposing roller at a time when the secondary transferring unit is deactivated, is larger than that at a time when the primary transferring unit is activated.Type: GrantFiled: January 27, 2006Date of Patent: October 28, 2008Assignee: Konica Minolta Business Technologies, Inc.Inventors: Akira Hamada, legal representative, Yoshiko Hamada, legal representative, Takenobu Kimura, Yotaro Sato, Shuta Hamada
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Patent number: 7373100Abstract: A color image forming apparatus may have an image forming unit composed of a plurality of groups which have image carriers and image forming devices.Type: GrantFiled: December 14, 2005Date of Patent: May 13, 2008Assignee: Konica Minolta Business Technologies, Inc.Inventors: Akira Hamada, legal representative, Yoshiko Hamada, legal representative, Takenobu Kimura, Yotaro Sato, Shuta Hamada
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Patent number: 7327976Abstract: There is disclosed a color image forming apparatus, which makes it possible to prevent a reproduced image from generating image defects, such as a color unevenness, a toner scattering, etc.Type: GrantFiled: October 26, 2005Date of Patent: February 5, 2008Assignee: Konica Minolta Business Technologies, Inc.Inventors: Akira Hamada, legal representative, Yoshiko Hamada, legal representative, Takenobu Kimura, Yotaro Sato, Shuta Hamada, deceased
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Patent number: 7308212Abstract: The color image forming apparatus, having: an intermediate transfer member; a plurality of image forming sections provided along the intermediate transfer member; a primary transfer device provided along the intermediate transfer member to transfer toner images formed on each image forming section so that the toner images are superimposed on the intermediate transfer member; a secondary transfer device provided downstream side of the primary transfer device to transfer superimposed toner images through bias voltage; a discharging device having a grid and a discharge electrode provided between the primary transfer device and secondary transfer device; a image density sensor provided along the intermediate transfer member to detect an amount of toner adhesion on the intermediate transfer member; and a control device to control the applied voltage for the discharge electrode in accordance with output of the image density sensor.Type: GrantFiled: February 22, 2006Date of Patent: December 11, 2007Assignee: Konica Minolta Business Technologies, Inc.Inventors: Akira Hamada, legal representative, Yoshiko Hamada, legal representative, Yotaro Sato, Takenobu Kimura, Shuta Hamada, deceased
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Patent number: 7298997Abstract: A color image forming apparatus includes primary transferring units that transfer toner images of different colors from photoreceptors to an intermediate transfer body, a secondary transferring unit that transfers a color toner image from the intermediate transfer body onto a transfer material, a pre-charging unit placed downstream of the primary transferring units and upstream of the secondary transferring unit and that applies electric charge to the color toner image on the intermediate transfer body before the secondary image transfer with the polarity of the applied electrical charge identical to polarity of the potential of the toner, and a potential adjustment unit placed downstream of the pre-charging unit and upstream of the secondary transferring unit, and that applies an electric charge that has a polarity opposite to that of the potential of the toner to the color toner image on the intermediate transfer body.Type: GrantFiled: July 18, 2005Date of Patent: November 20, 2007Assignee: Konica Minolta Business Technologies, Inc.Inventors: Akira Hamada, legal representative, Yoshiko Hamada, legal representative, Takenobu Kimura, Yotaro Sato, Shuta Hamada, deceased
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Patent number: 7260350Abstract: There is described an image forming apparatus, which makes it possible to conduct a sufficient discharging operation for a toner image. The apparatus includes an image forming section, an image bearing member, an intermediate transfer belt, a part of which is supported in a state of a flat plane by supporting members, a primary transferring device to transfer a toner image from the image bearing member onto the intermediate transfer member, a secondary transferring device to transfer the toner image onto a transfer material, a scorotron discharging device that is disposed at an upstream side of the secondary transferring device, where the part of the intermediate transfer member is supported in the state of the flat plane, and includes a discharging electrode and a grid to discharge the toner image; and a conductive brush that opposes to the scorotron discharging device and contacts the rear surface of intermediate transfer member.Type: GrantFiled: July 18, 2005Date of Patent: August 21, 2007Assignee: Konica Minolta Business Technologies, Inc.Inventors: Akira Hamada, legal representative, Yoshiko Hamada, legal representative, Takenobu Kimura, Yotaro Sato, Shuta Hamada, deceased
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Patent number: 7254358Abstract: A color image forming apparatus includes plural developing units that respectively form toner images of different colors on plural photoreceptors, plural primary transferring devices that successively transfer each of the toner images of the plural photoreceptors onto an intermediate transfer belt, which holds a color toner image transferred and superimposed by primary transfer, a secondary transferring device that transfers concurrently the color toner image onto a transfer material, a drive roller that drives the intermediate transfer belt and that is placed between one of the plurality of primary transferring devices which is arranged on the most downstream side in the direction of movement of the intermediate transfer belt and the secondary transferring device, and a controller that controls a discharger discharging the color toner image and the drive of the drive roller.Type: GrantFiled: July 18, 2005Date of Patent: August 7, 2007Assignee: Konica Minolta Business Technologies, Inc.Inventors: Akira Hamada, legal representative, Yoshiko Hamada, legal representative, Takenobu Kimura, Yotaro Sato, Shuta Hamada, deceased
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Patent number: 7209692Abstract: A color image forming apparatus is described, which makes highly durable image transferring possible.Type: GrantFiled: November 21, 2005Date of Patent: April 24, 2007Assignee: Konica Minolta Business Technologies, Inc.Inventors: Akira Hamada, legal representative, Yoshiko Hamada, legal representative, Takenobu Kimura, Yotaro Sato, Shuta Hamada, deceased
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Publication number: 20060228136Abstract: The color image forming apparatus, having: an intermediate transfer member; a plurality of image forming sections provided along the intermediate transfer member; a primary transfer device provided along the intermediate transfer member to transfer toner images formed on each image forming section so that the toner images are superimposed on the intermediate transfer member; a secondary transfer device provided downstream side of the primary transfer device to transfer superimposed toner images through bias voltage; a discharging device having a grid and a discharge electrode provided between the primary transfer device and secondary transfer device; a image density sensor provided along the intermediate transfer member to detect an amount of toner adhesion on the intermediate transfer member; and a control device to control the applied voltage for the discharge electrode in accordance with output of the image density sensor.Type: ApplicationFiled: February 22, 2006Publication date: October 12, 2006Inventors: Shuta Hamada, Akira Hamada, Yoshiko Hamada, Yotaro Sato, Takenobu Kimura
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Publication number: 20060198665Abstract: A color image forming apparatus has an image forming unit, wherein the image forming device provided around the image carrier forms a toner image on the image carrier; an intermediate transfer member; a primary transfer unit for transferring the toner image onto the intermediate transfer member to form an superimposed toner image; a secondary transfer unit which transfers the toner image onto a transfer material; an electricity removal unit which has a discharge electrode and a grid electrode, and is provided between the primary transfer unit and the secondary transfer unit; a discharge electrode power source for applying a DC voltage with reverse polarity to the toner image on the intermediate transfer member to the discharge electrode; a grid electrode power source for applying a DC voltage with the same polarity as the toner image to the grid electrode; a counter electrode which is provided facing the electricity removal unit; a current detecting unit for detecting an electricity removal current, and a conType: ApplicationFiled: December 14, 2005Publication date: September 7, 2006Inventors: Shuta Hamada, Akira Hamada, Yoshiko Hamada, Takenobu Kimura, Yotaro Sato
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Publication number: 20060177245Abstract: There is described a color image forming apparatus, which makes the high durable transferring operation possible.Type: ApplicationFiled: November 21, 2005Publication date: August 10, 2006Inventors: Shuta Hamada, Akira Hamada, Yoshiko Hamada, Takenobu Kimura, Yotaro Sato
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Publication number: 20060171735Abstract: There is described an image forming apparatus equipped with a cleaning unit to clean a belt-type transfer member. The cleaning unit includes: a conductive opposing roller that contacts an inner surface of the intermediate transfer member; a first conductive blush member and a second conductive blush member, both of which are pressed against the conductive opposing roller while putting the intermediate transfer member between them; a cleaning-voltage applying power source to apply a cleaning voltage having a polarity opposite to that of the residual toner onto the first conductive blush member; and an opposing-roller potential controlling unit to control an electric potential state of the conductive opposing roller, so that an electric potential difference, between the first conductive blush member and the conductive opposing roller at a time when the secondary transferring unit is deactivated, is larger than that at a time when the primary transferring unit is activated.Type: ApplicationFiled: January 27, 2006Publication date: August 3, 2006Inventors: Shuta Hamada, Akira Hamada, Yoshiko Hamada, Takenobu Kimura, Yotaro Sato
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Publication number: 20060153601Abstract: There is disclosed a color image forming apparatus, which makes it possible to prevent a reproduced image from generating image defects, such as a color unevenness, a toner scattering, etc.Type: ApplicationFiled: October 26, 2005Publication date: July 13, 2006Inventors: Shuta Hamada, Akira Hamda, Yoshiko Hamada, Takenobu Kimura, Yotaro Sato
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Publication number: 20060093408Abstract: A color image forming apparatus includes plural developing units that respectively form toner images of different colors on plural photoreceptors, plural primary transferring devices that successively transfer each of the toner images of the plural photoreceptors onto an intermediate transfer belt, which holds a color toner image transferred and superimposed by primary transfer, a secondary transferring device that transfers concurrently the color toner image onto a transfer material, a drive roller that drives the intermediate transfer belt and that is placed between one of the plurality of primary transferring devices which is arranged on the most downstream side in the direction of movement of the intermediate transfer belt and the secondary transferring device, and a controller that controls a discharger discharging the color toner image and the drive of the drive roller.Type: ApplicationFiled: July 18, 2005Publication date: May 4, 2006Inventors: Shuta Hamada, Akira Hamada, Yoshiko Hamada, Takenobu Kimura, Yotaro Sato
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Publication number: 20060088342Abstract: A color image forming apparatus includes primary transferring units that conduct the successive primary transfer onto an intermediate transfer body on which each of toner images different colors of the photoreceptors has been formed, a secondary transferring unit that transfers a color toner image formed by superimposing on the intermediate transfer body onto a transfer material, a pre-charging unit placed downstream of the primary transferring units and upstream of the secondary transferring unit and that applies electric charge to the color toner image on the intermediate transfer body before the secondary image transfer with the polarity of the applied electrical charge identical to polarity of the potential of the toner, and a potential adjustment unit placed downstream of the pre-charging unit and upstream of the secondary transferring unit, and applied an electric charge that has a polarity opposite to that of the potential of the toner to the color toner image on the intermediate transfer body.Type: ApplicationFiled: July 18, 2005Publication date: April 27, 2006Inventors: Shuta Hamada, Akira Hamada, Yoshiko Hamada, Takenobu Kimura, Yotaro Sato
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Publication number: 20060078359Abstract: There is described an image forming apparatus, which makes it possible to conduct a sufficient discharging operation for a toner image. The apparatus includes an image forming section, an image bearing member, an intermediate transfer belt, a part of which is supported in a state of a flat plane by supporting members, a primary transferring device to transfer a toner image from the image bearing member onto the intermediate transfer member, a secondary transferring device to transfer the toner image onto a transfer material, a scorotron discharging device that is disposed at an upstream side of the secondary transferring device, where the part of the intermediate transfer member is supported in the state of the flat plane, and includes a discharging electrode and a grid to discharge the toner image; and a conductive brush that opposes to the scorotron discharging device and contacts the rear surface of intermediate transfer member.Type: ApplicationFiled: July 18, 2005Publication date: April 13, 2006Inventors: Shuta Hamada, Akira Hamada, Yoshiko Hamada, Takenobu Kimura, Yotaro Sato