Patents by Inventor Yuichiro Toyohara
Yuichiro Toyohara 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: 8218990Abstract: An image formation system includes an image forming apparatus for forming different color toner images on a recording material having a toner reception layer, a first heater for heating and pressing the toner image on the recording material, and a heater for heating and pressing the toner image on the recording material having been heated and pressed by the first heater. The first heater is operable so as to provide a granularity R of the toner image satisfying 0.5?R?4.0 and a glossiness G of the toner image satisfying 5?G?40, the second heater being operable so as to provide a granularity R of the toner image that is not more than 4.0 and a glossiness G of the toner image that is not less than 60.Type: GrantFiled: September 13, 2006Date of Patent: July 10, 2012Assignee: Canon Kabushiki KaishaInventors: Yuichiro Toyohara, Takeshi Menjo, Jiro Ishiduka, Haruhiko Omata, Motohide Shiozawa, Tatsuomi Murayama
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Patent number: 8126343Abstract: An image forming apparatus is provided that forms an image using developers of different tone and the same hue. When forming images for measurement for density control, the apparatus performs density control by forming a greater number of density levels of an image for measurement developed using a light developer than the number of density levels of an image for measurement developed using a dark developer. Thus, even if the amount of applied light developer may fluctuate, the fluctuation can be compensated to prevent the occurrence of pseudo-contours that lower image quality.Type: GrantFiled: April 6, 2011Date of Patent: February 28, 2012Assignee: Canon Kabushiki KaishaInventor: Yuichiro Toyohara
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Publication number: 20110182608Abstract: An image forming apparatus is provided that forms an image using developers of different tone and the same hue. When forming images for measurement for density control, the apparatus performs density control by forming a greater number of density levels of an image for measurement developed using a light developer than the number of density levels of an image for measurement developed using a dark developer. Thus, even if the amount of applied light developer may fluctuate, the fluctuation can be compensated to prevent the occurrence of pseudo-contours that lower image quality.Type: ApplicationFiled: April 6, 2011Publication date: July 28, 2011Applicant: CANON KABUSHIKI KAISHAInventor: Yuichiro TOYOHARA
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Patent number: 7945178Abstract: An image forming apparatus is provided that forms an image using developers of different tone and the same hue. When forming images for measurement for density control, the apparatus performs density control by forming a greater number of density levels of an image for measurement developed using a light developer than the number of density levels of an image for measurement developed using a dark developer. Thus, even if the amount of applied light developer may fluctuate, the fluctuation can be compensated to prevent the occurrence of pseudo-contours that lower image quality.Type: GrantFiled: November 1, 2007Date of Patent: May 17, 2011Assignee: Canon Kabushiki KaishaInventor: Yuichiro Toyohara
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Patent number: 7826772Abstract: An image forming apparatus includes a developing apparatus for developing an electrostatic image with a developer comprising at least a toner and a first external additive, the developing apparatus including a plurality of developing devices, containing toners different in color or lightness from each other, in which at least two developing devices contain a dark color toner and a light color toner which have an identical hue and different lightnesses and the developing device containing the light color toner is subjected to a developing operation prior to another developing device; a first transfer apparatus for sequentially transferring toner images, which have been developed by the plurality of developing devices, onto an intermediary transfer member; and a second transfer apparatus for transferring the toner images from the intermediary transfer member all together onto a transfer medium The first external additive includes particles having an aspect ratio of not less than 1.0 and not more than 1.Type: GrantFiled: August 7, 2009Date of Patent: November 2, 2010Assignee: Canon Kabushiki KaishaInventors: Fumitake Hirobe, Yuichiro Toyohara, Tatsuomi Murayama, Akihiro Noguchi
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Publication number: 20100021194Abstract: An image formation system includes image forming means for forming different color toner images on a recording material having a toner reception layer; first image heating means for heating and pressing the toner image on the recording material; second image heating means for heating and pressing the toner image on the recording material having been heated and pressed by the first image heating means; and wherein the first image heating means is operable so as to provide a granularity R of the toner image satisfying 0.5?R?4.0 and a glossiness G of the toner image satisfying 5?G?40, and the second image heating means is operable so as to provide a granularity R of the toner image satisfying not more than 4.0 and a glossiness G of the toner image satisfying not less than 60.Type: ApplicationFiled: September 13, 2006Publication date: January 28, 2010Applicant: CANON KABUSHIKI KAISHAInventors: Yuichiro Toyohara, Takeshi Menjo, Jiro Ishiduka, Haruhiko Omata, Motohide Shiozawa, Tatsuomi Murayama
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Publication number: 20090317139Abstract: An image forming apparatus includes a developing apparatus for developing an electrostatic image with a developer comprising at least a toner and a first external additive, the developing apparatus including a plurality of developing devices, containing toners different in color or lightness from each other, in which at least two developing devices contain a dark color toner and a light color toner which have an identical hue and different lightnesses and the developing device containing the light color toner is subjected to a developing operation prior to another developing device; a first transfer apparatus for sequentially transferring toner images, which have been developed by the plurality of developing devices, onto an intermediary transfer member; and a second transfer apparatus for transferring the toner images from the intermediary transfer member all together onto a transfer medium The first external additive includes particles having an aspect ratio of not less than 1.0 and not more than 1.Type: ApplicationFiled: August 7, 2009Publication date: December 24, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Fumitake HIROBE, Yuichiro TOYOHARA, Tatsuomi MURAYAMA, Akihiro NOGUCHI
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Patent number: 7596345Abstract: An image forming apparatus includes a developing apparatus for developing an electrostatic image with a developer comprising at least a toner and a first external additive, the developing apparatus including a plurality of developing devices, containing toners different in color or lightness from each other, in which at least two developing devices contain a dark color toner and a light color toner which have an identical hue and different lightnesses and the developing device containing the light color toner is subjected to a developing operation prior to another developing device; a first transfer apparatus for sequentially transferring toner images, which have been developed by the plurality of developing devices, onto an intermediary transfer member; and a second transfer apparatus for transferring the toner images from the intermediary transfer member all together onto a transfer medium The first external additive includes particles having an aspect ratio of not less than 1.0 and not more than 1.Type: GrantFiled: August 23, 2006Date of Patent: September 29, 2009Assignee: Canon Kabushiki KaishaInventors: Fumitake Hirobe, Yuichiro Toyohara, Tatsuomi Murayama, Akihiro Noguchi
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Patent number: 7522852Abstract: A toner image forming device for forming, on the basis of input image signals, a toner image on a recording material with a first toner and a second toner having the same hue as the first toner and a density different from that of the first toner. A fixing device for heating and fixing the toner image on the recording material. A selecting device for selecting either one of a first mode and a second mode, wherein a glossiness level of a toner image outputted in response to the input image signals having the same density level is higher in the second mode than in the first mode. A changing device for changing, in response to selection of said selecting means, a fixing condition of said fixing means and a use ratio of the second toner at the input image signal corresponding to a predetermined density level.Type: GrantFiled: August 8, 2006Date of Patent: April 21, 2009Assignee: Canon Kabushiki KaishaInventor: Yuichiro Toyohara
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Publication number: 20080107434Abstract: An image forming apparatus is provided that forms an image using developers of different tone and the same hue. When forming images for measurement for density control, the apparatus performs density control by forming a greater number of density levels of an image for measurement developed using a light developer than the number of density levels of an image for measurement developed using a dark developer. Thus, even if the amount of applied light developer may fluctuate, the fluctuation can be compensated to prevent the occurrence of pseudo-contours that lower image quality.Type: ApplicationFiled: November 1, 2007Publication date: May 8, 2008Applicant: CANON KABUSHIKI KAISHAInventor: Yuichiro Toyohara
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Patent number: 7340190Abstract: In an image forming apparatus, an image forming condition is changed depending on whether or not a recording material on which a toner image is formed is ordinary high gloss paper or thermoplastic resin coated paper. More specifically, in the case where a high gloss mode is selected during image formation, judgement whether or not the high gloss paper is the ordinary high gloss paper or the thermoplastic resin coated paper is made. In the former case, a screen line number is set to 150 lpi, and in the latter case, the screen line number is set to 200 lpi. As a result, image failure due to collapse of a toner layer (during fixation) on the ordinary high gloss paper is prevented and high-quality toner image is formed on the thermoplastic resin coated paper.Type: GrantFiled: March 30, 2007Date of Patent: March 4, 2008Assignee: Canon Kabushiki KaishaInventors: Yuichiro Toyohara, Haruhiko Omata
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Patent number: 7324765Abstract: In an image forming apparatus, an image forming condition is changed depending on whether or not a recording material on which a toner image is formed is ordinary high gloss paper or thermoplastic resin coated paper. More specifically, in the case where a high gloss mode is selected during image formation, judgement whether or not the high gloss paper is the ordinary high gloss paper or the thermoplastic resin coated paper is made. In the former case, a screen line number is set to 150 lpi, and in the latter case, the screen line number is set to 200 lpi. As a result, image failure due to collapse of a toner layer (during fixation) on the ordinary high gloss paper is prevented and high-quality toner image is formed on the thermoplastic resin coated paper.Type: GrantFiled: March 25, 2005Date of Patent: January 29, 2008Assignee: Canon Kabushiki KaishaInventors: Yuichiro Toyohara, Haruhiko Omata
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Publication number: 20070166086Abstract: In an image forming apparatus, an image forming condition is changed depending on whether or not a recording material on which a toner image is formed is ordinary high gloss paper or thermoplastic resin coated paper. More specifically, in the case where a high gloss mode is selected during image formation, judgement whether or not the high gloss paper is the ordinary high gloss paper or the thermoplastic resin coated paper is made. In the former case, a screen line number is set to 150 lpi, and in the latter case, the screen line number is set to 200 lpi. As a result, image failure due to collapse of a toner layer (during fixation) on the ordinary high gloss paper is prevented and high-quality toner image is formed on the thermoplastic resin coated paper.Type: ApplicationFiled: March 30, 2007Publication date: July 19, 2007Applicant: CANON KABUSHIKI KAISHAInventors: YUICHIRO TOYOHARA, Haruhiko Omata
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Publication number: 20070059056Abstract: An image-forming apparatus includes: a first image carrier for carrying a light toner image which is formed with a light toner; a first transfer member for electrostatically transferring the light toner onto an intermediate transfer body; a second image carrier for carrying a dark toner image which is formed with a dark toner having the same hue as that of the light toner and having a density higher than that of the light toner; a second transfer member for electrostatically transferring the dark toner image onto the intermediate transfer body; and a secondary transfer member for transferring the dark toner image and the light toner image electrostatically onto a recording medium together, in which the light toner has a volume mean particle diameter greater than that of the dark toner.Type: ApplicationFiled: August 31, 2006Publication date: March 15, 2007Applicant: CANON KABUSHIKI KAISHAInventors: Tatsuomi Murayama, Yuichiro Toyohara
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Publication number: 20070048021Abstract: An image forming apparatus includes a developing apparatus for developing an electrostatic image with a developer comprising at least a toner and a first external additive, the developing apparatus including a plurality of developing devices, containing toners different in color or lightness from each other, in which at least two developing devices contain a dark color toner and a light color toner which have an identical hue and different lightnesses and the developing device containing the light color toner is subjected to a developing operation prior to another developing device; a first transfer apparatus for sequentially transferring toner images, which have been developed by the plurality of developing devices, onto an intermediary transfer member; and a second transfer apparatus for transferring the toner images from the intermediary transfer member all together onto a transfer medium The first external additive includes particles having an aspect ratio of not less than 1.0 and not more than 1.Type: ApplicationFiled: August 23, 2006Publication date: March 1, 2007Applicant: Canon Kabushiki KaishaInventors: Fumitake Hirobe, Yuichiro Toyohara, Tatsuomi Murayama, Akihiro Noguchi
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Publication number: 20060269330Abstract: An image forming apparatus includes an image bearing member for carrying an electrostatic image; developing means for developing the electrostatic image with a plurality of toners having the same hue and having different densities; toner image formation means for forming on a recording material a toner image constituted by the toner having the same hue and different densities; and fixing means for fixing the toner image on the recording material, wherein a total of amounts per unit area of the toners which have the same hue and different densities and which constitute a part of the toner image, is substantially the same as a total of amounts per unit area of the toners which have the same hue and different densities and which constitute another part of the toner image having a different density.Type: ApplicationFiled: August 8, 2006Publication date: November 30, 2006Applicant: Canon Kabushiki KaishaInventor: Yuichiro Toyohara
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Patent number: 7120368Abstract: An image forming apparatus includes an image bearing member; an electrostatic image forming device for forming an electrostatic image on the image bearing member on the basis of an input signal; a developing device for developing the electrostatic image with toners having the same hue and having different densities; a toner image formation device for forming a toner image on a recording material; and a fixing device for fixing the toner image on the recording material, wherein a total of amounts per unit area of the toners which have the same hue and different densities and which constitute the toner image, is different when the toner image is formed on the basis of an input signal on a recording material which is a paper sheet and when the toner image is formed on the basis of the same input signal on a recording material which is an OHP sheet.Type: GrantFiled: July 30, 2004Date of Patent: October 10, 2006Assignee: Canon Kabushiki KaishaInventor: Yuichiro Toyohara
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Patent number: 7113729Abstract: An image forming apparatus includes an image bearing member for carrying an electrostatic image; a developing device for developing the electrostatic image with a plurality of toners having the same hue and having different densities; a toner image formation device for forming on a recording material a toner image constituted by the toner having the same hue and different densities; and a fixing device for fixing the toner image on the recording material, wherein a total of amounts per unit area of the toners which have the same hue and different densities and which constitute a part of the toner image, is substantially the same as a total of amounts per unit area of the toners which have the same hue and different densities and which constitute another part of the toner image having a different density.Type: GrantFiled: July 28, 2004Date of Patent: September 26, 2006Assignee: Canon Kabushiki KaishaInventor: Yuichiro Toyohara
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Patent number: 7110686Abstract: An image forming apparatus includes an image bearing member for carrying an electrostatic image; a developing device for developing the electrostatic image with toners having the same hue and having different densities; a toner image formation device for forming a toner image on a recording material; and a fixing device for fixing the toner image on the recording material, wherein a ratio of amounts of toners having the same hue and different densities, which constitute the toner image is changed on the basis of a glossiness of the recording material.Type: GrantFiled: July 30, 2004Date of Patent: September 19, 2006Assignee: Canon Kabushiki KaishaInventor: Yuichiro Toyohara
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Publication number: 20050214004Abstract: In an image forming apparatus, an image forming condition is changed depending on whether or not a recording material on which a toner image is formed is ordinary high gloss paper or thermoplastic resin coated paper. More specifically, in the case where a high gloss mode is selected during image formation, judgement whether or not the high gloss paper is the ordinary high gloss paper or the thermoplastic resin coated paper is made. In the former case, a screen line number is set to 150 lpi, and in the latter case, the screen line number is set to 200 lpi. As a result, image failure due to collapse of a toner layer (during fixation) on the ordinary high gloss paper is prevented and high-quality toner image is formed on the thermoplastic resin coated paper.Type: ApplicationFiled: March 25, 2005Publication date: September 29, 2005Applicant: CANON KABUSHIKI KAISHAInventors: Yuichiro Toyohara, Haruhiko Omata