Patents by Inventor Yasuo Yoda
Yasuo Yoda 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: 10452012Abstract: A cylindrical fixing member for use with a fixing device includes a heat generating layer and an electrode layer contacting the heat generating layer. The electrode layer is smaller in volume resistance value than the heat generating layer. The electrode layer is formed in a helical shape so that a helical axis thereof extends in a direction along a generatrix direction of the fixing member. One end and the other end of the electrode layer are electrically open.Type: GrantFiled: March 15, 2017Date of Patent: October 22, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Masatake Usui, Takaaki Tsuruya, Yasuo Yoda, Yasunari Kobaru, Akira Kato, Hiroki Eguchi, Michio Uchida, Tetsuya Sano, Atsuyoshi Abe, Aoji Isono, Minoru Hayasaki, Hiroshi Mano, Yuki Nishizawa, Akira Kuroda
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Publication number: 20190018350Abstract: A cylindrical fixing member for use with a fixing device includes a heat generating layer and an electrode layer contacting the heat generating layer. The electrode layer is smaller in volume resistance value than the heat generating layer. The electrode layer is formed in a helical shape so that a helical axis thereof extends in a direction along a generatrix direction of the fixing member. One end and the other end of the electrode layer are electrically open.Type: ApplicationFiled: March 15, 2017Publication date: January 17, 2019Inventors: Masatake Usui, Takaaki Tsuruya, Yasuo Yoda, Yasunari Kobaru, Akira Kato, Hiroki Eguchi, Michio Uchida, Tetsuya Sano, Atsuyoshi Abe, Aoji Isono, Minoru Hayasaki, Hiroshi Mano, Yuki Nishizawa, Akira Kuroda
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Patent number: 9507288Abstract: An image forming apparatus includes: a photosensitive member configured to be rotated; scanning means for scanning, by light corresponding to image data, the photosensitive member that is charged, thereby forming an electrostatic latent image on the photosensitive member; and a contacting member in contact with the photosensitive member to form a nip portion. In a correction mode in which a shift of an image is corrected based on a detection result obtained by detecting, at the nip portion, an electrostatic latent image for correction formed on the photosensitive member by the scanning means, a width of the electrostatic latent image for correction is equal to or more than a width of the nip portion in a rotation direction of the photosensitive member.Type: GrantFiled: December 27, 2012Date of Patent: November 29, 2016Assignee: Canon Kabushiki KaishaInventors: Kentaro Yamashita, Yasuo Yoda, Akinobu Hirayama, Takateru Ohkubo, Kenji Watanabe, Hiromitsu Kumada, Yoshiko Kubo, Hiroshi Hagiwara, Shuhei Watanabe
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Patent number: 9037020Abstract: An image forming apparatus includes a toner carrying member for carrying a toner; an image carrying member on which a toner image is formed with the toner; and a plurality of divided electrode portions provided at a position in which the electrode portions oppose the toner carrying member via the image carrying member interposed therebetween. The electrode portions are supplied with a voltage on the basis of image information to move the toner between the toner carrying member and the image carrying member thereby to form the toner image. The electrode portions includes a first electrode portion for forming an image portion and a second electrode portion, adjacent to the first electrode portion, for forming a non-image portion.Type: GrantFiled: December 9, 2011Date of Patent: May 19, 2015Assignee: Canon Kabushiki KaishaInventors: Eiji Uekawa, Yasuo Yoda, Yasunari Kobaru, Takahiro Uchiyama
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Patent number: 8989639Abstract: An image forming apparatus includes a toner carrying roller for carrying a toner, an image carrying member, contacting the toner on the toner carrying roller, on which a toner image is to be formed with the toner, and an electrode portion provided at an opposing position in which the electrode portion opposes the toner carrying roller via the image carrying member interposed therebetween. The toner image is formed on the image carrying member by changing a value of a voltage, on the basis of image information, applied to the electrode portion, and the toner carried on the toner carrying roller and the image carrying member contact each other in a toner contact area. The toner is moved between the toner carrying roller and the image carrying member in a toner movement area by changing the value of the voltage applied to the electrode portion, and the toner movement area is present downstream of the toner contact area with respect to a movement direction of the image carrying member.Type: GrantFiled: November 18, 2011Date of Patent: March 24, 2015Assignee: Canon Kabushiki KaishaInventors: Yasunari Kobaru, Yasuo Yoda, Takahiro Uchiyama, Yoshiki Kudo, Takeshi Kawamura, Tatsuaki Orihara, Naoto Tsuchihashi, Hidetoshi Hanamoto
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Publication number: 20140314433Abstract: An image forming apparatus includes: a photosensitive member configured to be rotated; scanning means for scanning, by light corresponding to image data, the photosensitive member that is charged, thereby forming an electrostatic latent image on the photosensitive member; and a contacting member in contact with the photosensitive member to form a nip portion. In a correction mode in which a shift of an image is corrected based on a detection result obtained by detecting, at the nip portion, an electrostatic latent image for correction formed on the photosensitive member by the scanning means, a width of the electrostatic latent image for correction is equal to or more than a width of the nip portion in a rotation direction of the photosensitive member.Type: ApplicationFiled: December 27, 2012Publication date: October 23, 2014Applicant: CANON KABUSHIKI kAISHAInventors: Kentaro Yamashita, Yasuo Yoda, Akinobu Hirayama, Takateru Ohkubo, Kenji Watanabe, Hiromitsu Kumada, Yoshiko Kubo, Hiroshi Hagiwara, Shuhei Watanabe
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Patent number: 8675032Abstract: An image forming apparatus includes: an image bearing member configured to bear a toner image; a plurality of electrode portions; a control unit configured to control a voltage applied to the electrode unit based on image information; and a toner bearing member configured to bear toner and form a toner image on the image bearing member according to the voltage applied to the electrode portion, in which ?>1.22 is satisfied and rx?/ry? is defined as ?, where Dy indicates a thickness of the image bearing member, Dx indicates a distance between the electrode portions adjacent to each other, rx? indicates a resistance component of the image bearing member in a direction parallel to Dx and ry? indicates a resistance component of the image bearing member in a direction parallel to Dy in a rectangular solid body including Dx and Dy in a side.Type: GrantFiled: December 13, 2012Date of Patent: March 18, 2014Assignee: Canon Kabushiki KaishaInventors: Yoshiki Kudo, Hiroshi Mano, Toshikazu Tsuchiya, Yasuo Yoda, Atsushi Ogata, Naoto Tsuchihashi, Takahiro Uchiyama
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Publication number: 20130343788Abstract: An image forming apparatus includes a toner carrying member for carrying a toner; an image carrying member, contacting the toner on the toner carrying member, on which a toner image is to be formed with the toner; and an electrode portion provided at an opposing position in which the electrode portion opposes the toner carrying member via the image carrying member interposed therebetween. The toner image is formed on the image carrying member by changing a value of a voltage, on the basis of image information, applied to the electrode portion. The toner carried on the toner carrying member and the image carrying member contact each other in a toner contact area. The toner is moved between the toner carrying member and the image carrying member in a toner movement area by changing the value of the voltage applied to the electrode portion. The toner movement area is present downstream of the toner contact area with respect to a movement direction of the image carrying member.Type: ApplicationFiled: November 18, 2011Publication date: December 26, 2013Inventors: Yasunari Kobaru, Yasuo Yoda, Takahiro Uchiyama, Yoshiki Kudo, Takeshi Kawamura, Tatsuaki Orihara, Naoto Tsuchihashi, Hidetoshi Hanamoto
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Publication number: 20130279930Abstract: An image forming apparatus includes a toner carrying member for carrying a toner; an image carrying member on which a toner image is formed with the toner; and a plurality of divided electrode portions provided at a position in which the electrode portions oppose the toner carrying member via the image carrying member interposed therebetween. The electrode portions are supplied with a voltage on the basis of image information to move the toner between the toner carrying member and the image carrying member thereby to form the toner image. The electrode portions includes a first electrode portion for forming an image portion and a second electrode portion, adjacent to the first electrode portion, for forming a non-image portion.Type: ApplicationFiled: December 9, 2011Publication date: October 24, 2013Applicant: CANON KABUSHIKI KAISHAInventors: Eiji Uekawa, Yasuo Yoda, Yasunari Kobaru, Takahiro Uchiyama
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Patent number: 7043183Abstract: The image forming apparatus has an image bearing member bearing an image thereon, and a transfer member contacting with the image bearing member in a contact portion, the image on the image bearing member is transferred to a transfer medium in the contact portion by the transfer member, the Young's modulus of the image bearing member is equal to or greater than 2×108 [N/m2] and equal to or less than 9×109 [N/m2] and contact pressure P between the image bearing member and the transfer member is equal to or greater than 4.0×104 [N/m2] and equal to or less than 7.3×104 [N/m2]. Thereby, there is provided an image forming apparatus which prevents the deterioration of an image even if use is made of an image bearing member of high hardness.Type: GrantFiled: July 25, 2003Date of Patent: May 9, 2006Assignee: Canon Kabushiki KaishaInventors: Yasuo Yoda, Kenichi Iida, Hisahiro Saito
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Patent number: 6987939Abstract: An image forming apparatus includes an image bearing member; a charging device for electrically charging the image bearing member at a contact position; a transferring device for transferring a developed image on the image bearing member onto a transfer material; and a developer charging device for electrically charging a developer remaining on the image bearing member after the image is transferred. The developer charging device is disposed downstream of the transferring device and upstream of the charging device with respect to a moving direction of the image bearing member. An electric field forming device forms a cleaning electric field in a direction of transferring the developer from the developer charging device onto a predetermined region of the image bearing member and forms a cleaning electric field for transferring the developer from the charging device onto the image bearing member after the predetermined region passes through the contact portion.Type: GrantFiled: October 2, 2003Date of Patent: January 17, 2006Assignee: Canon Kabushiki KaishaInventors: Tatsunori Ishiyama, Yasuo Yoda, Kenichi Iida
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Patent number: 6980749Abstract: An image forming apparatus includes a movable image bearing member, a movable intermediary transfer member, wherein an image on the image bearing member is transferred onto the intermediary transfer member by primary transfer and the image transferred onto the intermediary transfer member is transferred onto a transfer material by secondary transfer, a discriminator for discriminating a kind of the transfer material, and a controller for controlling a moving speed ratio between the image bearing member and the intermediary transfer member on the basis of an output of the discriminator.Type: GrantFiled: September 24, 2003Date of Patent: December 27, 2005Assignee: Canon Kabushiki KaishaInventors: Yasuo Yoda, Tatsunori Ishiyama, Yoichiro Maebashi, Hiroshi Kawaguchi, Kenichi Iida, Yuki Nishizawa
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Patent number: 6956594Abstract: The image forming apparatus includes, a movable first image bearing member on which a toner image is formed; and a movable second image bearing member which is brought into contact with the first image bearing member and to which the toner image on the first image bearing member is transferred, in which the toner image on the second image bearing member is transferred onto a transferring material, a dot-shaped dot image formed of a toner different from the toner image is formable on the first image bearing member, and the dot image is variable according to a condition upon forming the toner image on the transferring material. Thus, there is provided an image forming apparatus capable of forming a final image with a high quality in a stable manner independently of a selection of a type of transferring materials or image quality mode as well as suppressing an image streak occurrence.Type: GrantFiled: September 15, 2003Date of Patent: October 18, 2005Assignee: Canon Kabushik KaishaInventors: Kenichi Iida, Tatsunori Ishiyama, Yasuo Yoda
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Patent number: 6947695Abstract: The image forming apparatus includes a movable first image bearing member on which a toner image is formed, and a movable second image bearing member which is brought into contact with the first image bearing member and to which the toner image on the first image bearing member is transferred, in which a dot-shaped dot image formed of a toner different from the toner image is formable on the first image bearing member, and in which a distance between dot centers of the dot images is equal to or smaller than a width of a contact part between the first image bearing member and the second image bearing member in a moving direction of the first image bearing member. Consequently, it is possible to steadily suppress an image streak occurrence and to obtain a final image having a high quality in a stable manner.Type: GrantFiled: September 15, 2003Date of Patent: September 20, 2005Assignee: Canon Kabushiki KaishaInventors: Kenichi Iida, Tatsunori Ishiyama, Yasuo Yoda
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Publication number: 20050078981Abstract: An image forming apparatus includes an image bearing member; charging means for electrically charging the image bearing member while contacting to the image bearing member; transferring means for transferring a developed image on the image bearing member onto a transfer material; developer charging means for electrically charging a developer remaining on the image bearing member after the image is transferred, the developer charging means being disposed downstream of the transferring means and upstream of the charging means with respect to a moving direction of the image bearing member; and electric field forming means for forming a cleaning electric field in a direction of transferring the developer from the developer charging means onto a predetermined region of the image bearing member and for forming a cleaning electric field for transferring the developer from the charging means onto the image bearing member after the predetermined region of the image bearing member passes through a contact portion betweType: ApplicationFiled: October 2, 2003Publication date: April 14, 2005Applicant: Canon Kabushiki KaishaInventors: Tatsunori Ishiyama, Yasuo Yoda, Kenichi Iida
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Patent number: 6834177Abstract: An image forming apparatus includes an image bearing belt; a supporting roller for supporting the image bearing belt; a transfer roller for forming a nip with the image bearing belt, wherein an image is transferred from the image bearing belt onto a transfer material at the nip by applying a voltage to set transfer roller; wherein the nip has a first nip portion where the transfer roller is contacted to the image bearing belt without being backed up by the supporting roller, and a second nip portion where the transfer roller is contacted to set image bearing belt by being backed up by the supporting roller, the first nip portion being upstream of the second nip portion; and a regulating member for regulating a discharging the direction of the transfer material to be discharged from the nip.Type: GrantFiled: August 28, 2002Date of Patent: December 21, 2004Assignee: Canon Kabushiki KaishaInventors: Hisahiro Saito, Yasuo Yoda, Kenichi Iida
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Publication number: 20040208678Abstract: The image forming apparatus has an image bearing member bearing an image thereon, and a transfer member contacting with the image bearing member in a contact portion, the image on the image bearing member is transferred to a transfer medium in the contact portion by the transfer member, the Young's modulus of the image bearing member is equal to or greater than 2×108 [N/m2] and equal to or less than 9×109 [N/m2] and contact pressure P between the image bearing member and the transfer member is equal to or greater than 4.0×104 [N/m2] and equal to or less than 7.3×104 [N/m2]. Thereby, there is provided an image forming apparatus which prevents the deterioration of an image even if use is made of an image bearing member of high hardness.Type: ApplicationFiled: July 25, 2003Publication date: October 21, 2004Applicant: Canon Kabushiki KaishaInventors: Yasuo Yoda, Kenichi Iida, Hisahiro Saito
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Publication number: 20040126152Abstract: The image forming apparatus includes a movable first image bearing member on which a toner image is formed, and a movable second image bearing member which is brought into contact with the first image bearing member and to which the toner image on the first image bearing member is transferred, in which a dot-shaped dot image formed of a toner different from the toner image is formable on the first image bearing member, and in which a distance between dot centers of the dot images is equal to or smaller than a width of a contact part between the first image bearing member and the second image bearing member in a moving direction of the first image bearing member. Consequently, it is possible to steadily suppress an image streak occurrence and to obtain a final image having a high quality in a stable manner.Type: ApplicationFiled: September 15, 2003Publication date: July 1, 2004Applicant: Canon Kabushiki KaishaInventors: Kenichi Iida, Tatsunori Ishiyama, Yasuo Yoda
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Publication number: 20040126125Abstract: An image forming apparatus includes a movable image bearing member, a movable intermediary transfer member, wherein an image on the image bearing member is transferred onto the intermediary transfer member by primary transfer and the image transferred onto the intermediary transfer member is transferred onto a transfer material by secondary transfer, discrimination means for discriminating a kind of the transfer material, and control means for controlling a moving speed ratio between the image bearing member and the intermediary transfer member on the basis of an output of the discrimination means.Type: ApplicationFiled: September 24, 2003Publication date: July 1, 2004Applicant: Canon Kabushiki KaishaInventors: Yasuo Yoda, Tatsunori Ishiyama, Yoichiro Maebashi, Hiroshi Kawaguchi, Kenichi Iida, Yuki Nishizawa
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Publication number: 20040114948Abstract: The image forming apparatus includes, a movable first image bearing member on which a toner image is formed; and a movable second image bearing member which is brought into contact with the first image bearing member and to which the toner image on the first image bearing member is transferred, in which the toner image on the second image bearing member is transferred onto a transferring material, a dot-shaped dot image formed of a toner different from the toner image is formable on the first image bearing member, and the dot image is variable according to a condition upon forming the toner image on the transferring material. Thus, there is provided an image forming apparatus capable of forming a final image with a high quality in a stable manner independently of a selection of a type of transferring materials or image quality mode as well as suppressing an image streak occurrence.Type: ApplicationFiled: September 15, 2003Publication date: June 17, 2004Applicant: Canon Kabushiki KaishaInventors: Kenichi Iida, Tatsunori Ishiyama, Yasuo Yoda