Patents by Inventor Tomoichiro Ohta
Tomoichiro Ohta 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).
-
Patent number: 8661918Abstract: A force sensor of the present invention corrects the output voltages of Hall elements without using a temperature sensor in response to changes in the characteristics of a magnet and the Hall elements.Type: GrantFiled: January 27, 2012Date of Patent: March 4, 2014Assignee: Canon Kabushiki KaishaInventor: Tomoichiro Ohta
-
Patent number: 8613232Abstract: A force sensor of the present invention corrects the output voltages of Hall elements without using a temperature sensor in response to changes in the characteristics of a magnet and the Hall elements.Type: GrantFiled: January 27, 2012Date of Patent: December 24, 2013Assignee: Canon Kabushiki KaishaInventor: Tomoichiro Ohta
-
Publication number: 20120205931Abstract: A force sensor of the present invention corrects the output voltages of Hall elements without using a temperature sensor in response to changes in the characteristics of a magnet and the Hall elements.Type: ApplicationFiled: January 27, 2012Publication date: August 16, 2012Applicant: CANON KABUSHIKI KAISHAInventor: Tomoichiro Ohta
-
Patent number: 7711281Abstract: A technique for reducing downtime that accompanies the execution independently of adjustment processing for maintaining image quality and the execution of finishing processing relating to a printing medium. In order to apply the finishing processing to the printing medium in a finishing processing unit, an image forming apparatus to which this technique is applied sets a time between sheets that extends from end of image formation regarding a first sheet of the printing medium to start of image formation regarding a second sheet of the printing medium transported following the first sheet of the printing medium in the image forming unit, and executes adjustment processing, which is for maintaining image quality in the image forming unit, within the set time between sheets.Type: GrantFiled: August 15, 2006Date of Patent: May 4, 2010Assignee: Canon Kabushiki KaishaInventors: Shigemichi Hamano, Junichi Noguchi, Takashi Kanno, Takashi Soya, Shinichi Takata, Kiyoshi Okamoto, Katsuyuki Yamazaki, Tomoichiro Ohta
-
Patent number: 7546045Abstract: Disclosed is an image forming apparatus whereby waiting time (downtime), which is required for forming an image by automatic adjustment relating to image formation density or image formation position, is made shorter than in the prior art. When an image having a size equal to or less than a prescribed size is formed is formed in this apparatus, the image to be formed is placed on an image carrier in such a manner that a vacant area for forming an adjustment pattern can be reserved on the image carrier. As a result, automatic adjustment relating to image formation density or image formation position can be executed while an image is formed.Type: GrantFiled: May 11, 2006Date of Patent: June 9, 2009Assignee: Canon Kabushiki KaishaInventors: Junichi Noguchi, Takashi Kanno, Takashi Soya, Shinichi Takata, Shigemichi Hamano, Kiyoshi Okamoto, Katsuyuki Yamazaki, Tomoichiro Ohta
-
Patent number: 7471908Abstract: An image forming apparatus which can improve image formation capability to a satisfactory degree while curbing the rise in running cost. An image forming device forms adjustment images having different densities on an image support member having a higher optical reflectivity than an optical reflectivity of the adjustment images. A reading reads the adjustment images. An output from the reading device is read at a predetermined number of readings or time interval between readings based on the densities of the adjustment images susceptible to the optical reflectivity of the image support member.Type: GrantFiled: December 8, 2006Date of Patent: December 30, 2008Assignee: Canon Kabushiki KaishaInventors: Takashi Soya, Junichi Noguchi, Takashi Kanno, Shinichi Takata, Shigemichi Hamano, Kiyoshi Okamoto, Katsuyuki Yamazaki, Tomoichiro Ohta
-
Patent number: 7433620Abstract: An image forming apparatus including a fixing device for fixing by heat an image formed on a recording material; a heater for heating the fixing device; a controller for controlling electric power supply to the heater, wherein the apparatus is operable in a stand-by mode in which an electric energy consumption of the heater is reduced, wherein in the stand-by mode, the controller continuously supplies the electric power to the heater.Type: GrantFiled: July 11, 2005Date of Patent: October 7, 2008Assignee: Canon Kabushiki KaishaInventors: Nobuo Sekiguchi, Katsuhide Koga, Kenji Kuroki, Jun Nakazato, Tomoichiro Ohta, Yoshitaka Yamazaki
-
Patent number: 7372008Abstract: An image heating apparatus has a magnetic flux generator; a heat generating element for generating heat by a magnetic flux generated by the magnetic flux generator, the heat generating element being effective to heat an image on a recording material; an electric power supply for supplying electric power to the magnetic flux generator; electric power changing unit for changing electric power to be supplied to the magnetic flux generator on the basis of a temperature rise property of the heat generating element, in a period from start of electric power supply to the magnetic flux generator to reaching of a temperature of the heat generating element to a predetermined level.Type: GrantFiled: December 16, 2005Date of Patent: May 13, 2008Assignee: Canon Kabushiki KaishaInventors: Tomoichiro Ohta, Manabu Yamauchi, Hiroto Nishihara, Kenji Fukushi, Yasuyuki Aiko, Hidehiko Kinoshita, Takamitsu Hirayama
-
Patent number: 7292795Abstract: An image forming apparatus has a fixing unit for fixing a toner image formed on a recording material, and a heater, for heating the fixing unit, made of a carbon-based material. In order to detect and expect the life of the heating unit with good accuracy, the image forming apparatus further has a current measuring device for measuring a current passing through the heating unit and a notification device for providing notification of information on a life of the heating unit depending on an output of the current measuring device.Type: GrantFiled: July 22, 2005Date of Patent: November 6, 2007Assignee: Canon Kabushiki KaishaInventors: Kenji Kuroki, Katsuhide Koga, Jun Nakazato, Tomoichiro Ohta, Yoshitaka Yamazaki, Nobuo Sekiguchi
-
Patent number: 7262391Abstract: A heating apparatus, for heating a material P to be heated by heat from a heat generation member which has a predetermined curie temperature characteristic and generates heat by magnetic flux produced by a magnetic flux generation device. The apparatus includes a discrimination device for discriminating whether or not the curie temperature characteristic of the heat generation member is a predetermined characteristic and a control device for terminating the supply of electric power to the magnetic flux generation device when the discrimination device determines that the curie temperature characteristic is not the predetermined characteristic.Type: GrantFiled: February 7, 2006Date of Patent: August 28, 2007Assignee: Canon Kabushiki KaishaInventors: Hiroto Nishihara, Manabu Yamauchi, Kenji Fukushi, Yasuyuki Aiko, Hidehiko Kinoshita, Tomoichiro Ohta, Takamitsu Hirayama
-
Publication number: 20070134013Abstract: An image forming apparatus which can improve image formation capability to a satisfactory degree while curbing the rise in running cost. An image forming device forms adjustment images having different densities on an image support member having a higher optical reflectivity than an optical reflectivity of the adjustment images. A reading reads the adjustment images. An output from the reading device is read at a predetermined number of readings or time interval between readings based on the densities of the adjustment images susceptible to the optical reflectivity of the image support member.Type: ApplicationFiled: December 8, 2006Publication date: June 14, 2007Applicant: CANON KABUSHIKI KAISHAInventors: Takashi SOYA, Junichi NOGUCHI, Takashi KANNO, Shinichi TAKATA, Shigemichi HAMANO, Kiyoshi OKAMOTO, Katsuyuki YAMAZAKI, Tomoichiro OHTA
-
Publication number: 20070036575Abstract: A technique for reducing downtime that accompanies the execution independently of adjustment processing for maintaining image quality and the execution of finishing processing relating to a printing medium. In order to apply the finishing processing to the printing medium in a finishing processing unit, an image forming apparatus to which this technique is applied sets a time between sheets that extends from end of image formation regarding a first sheet of the printing medium to start of image formation regarding a second sheet of the printing medium transported following the first sheet of the printing medium in the image forming unit, and executes adjustment processing, which is for maintaining image quality in the image forming unit, within the set time between sheets.Type: ApplicationFiled: August 15, 2006Publication date: February 15, 2007Applicant: CANON KABUSHIKI KAISHAInventors: Shigemichi HAMANO, Junichi NOGUCHI, Takashi KANNO, Takashi SOYA, Shinichi TAKATA, Kiyoshi OKAMOTO, Katsuyuki YAMAZAKI, Tomoichiro OHTA
-
Publication number: 20060285863Abstract: Disclosed is an image forming apparatus whereby waiting time (downtime), which is required for forming an image by automatic adjustment relating to image formation density or image formation position, is made shorter than in the prior art. When an image having a size equal to or less than a prescribed size is formed is formed in this apparatus, the image to be formed is placed on an image carrier in such a manner that a vacant area for forming an adjustment pattern can be reserved on the image carrier. As a result, automatic adjustment relating to image formation density or image formation position can be executed while an image is formed.Type: ApplicationFiled: May 11, 2006Publication date: December 21, 2006Applicant: Cannon Kabushiki KaishaInventors: Junichi Noguchi, Takashi Kanno, Takashi Soya, Shinichi Takata, Shigemichi Hamano, Kiyoshi Okamoto, Katsuyuki Yamazaki, Tomoichiro Ohta
-
Publication number: 20060157475Abstract: A heating apparatus, for heating a material P to be heated by heat from a heat generation member which has a predetermined curie temperature characteristic and generates heat by magnetic flux produced by a magnetic flux generation device. The apparatus includes a discrimination device for discriminating whether or not the curie temperature characteristic of the heat generation member is a predetermined characteristic and a control device for terminating the supply of electric power to the magnetic flux generation device when the discrimination device determines that the curie temperature characteristic is not the predetermined characteristic.Type: ApplicationFiled: February 7, 2006Publication date: July 20, 2006Applicant: CANON KABUSHIKI KAISHAInventors: Hiroto Nishihara, Manabu Yamauchi, Kenji Fukushi, Yasuyuki Aiko, Hidehiko Kinoshita, Tomoichiro Ohta, Takamitsu Hirayama
-
Publication number: 20060131301Abstract: An image heating apparatus includes magnetic flux generating means; a heat generating element for generating heat by a magnetic flux generated by the magnetic flux generating means, the heat generating element being effective to heat an image on a recording material; electric power supplying means for supplying electric power to the magnetic flux generating means; electric power changing means for changing electric power to be supplied to the magnetic flux generating means on the basis of a temperature rise property of the heat generating element, in a period from start of electric power supply to the magnetic flux generating means to reaching of a temperature of the heat generating element to a predetermined level.Type: ApplicationFiled: December 16, 2005Publication date: June 22, 2006Applicant: CANON KABUSHIKI KAISHAInventors: Tomoichiro Ohta, Manabu Yamauchi, Hiroto Nishihara, Kenji Fukushi, Yasuyuki Aiko, Hidehiko Kinoshita, Takamitsu Hirayama
-
Patent number: 7030345Abstract: A heating apparatus, for heating a material P to be heated by heat from a heat generation member which has a predetermined curie temperature characteristic and generates heat by magnetic flux produced by a magnetic flux generation device. The apparatus includes a discrimination device for discriminating whether or not the curie temperature characteristic of the heat generation member is a predetermined characteristic and a control device for terminating the supply of electric power to the magnetic flux generation device when the discrimination device determines that the curie temperature characteristic is not the predetermined characteristic.Type: GrantFiled: March 14, 2005Date of Patent: April 18, 2006Assignee: Canon Kabushiki KaishaInventors: Hiroto Nishihara, Manabu Yamauchi, Kenji Fukushi, Yasuyuki Aiko, Hidehiko Kinoshita, Tomoichiro Ohta, Takamitsu Hirayama
-
Publication number: 20060024072Abstract: An image forming apparatus includes fixing means for fixing a toner image formed on a recording material, and heating means, for heating the fixing means, comprising a carbon-based material. In order to detect and expect the life of the heating means with good accuracy, the image forming apparatus further comprises current measuring means for measuring a current passing through the heating means and notification means for providing notification of information on a life of the heating means depending on an output of the current measuring means.Type: ApplicationFiled: July 22, 2005Publication date: February 2, 2006Applicant: CANON KABUSHIKI KAISHAInventors: Kenji Kuroki, Katsuhide Koga, Jun Nakazato, Tomoichiro Ohta, Yoshitaka Yamazaki, Nobuo Sekiguchi
-
Publication number: 20060018678Abstract: An image forming apparatus including fixing means for fixing by heat an image formed on a recording material; heating means for heating the fixing means; control means for controlling electric power supply to the heating means, wherein the apparatus is operable in a stand-by mode in which an electric energy consumption of the heating means is reduced, wherein in the stand-by mode, the control means continuously supply the electric power to the heating means.Type: ApplicationFiled: July 11, 2005Publication date: January 26, 2006Applicant: CANON KABUSHIKI KAISHAInventors: Nobuo Sekiguchi, Katsuhide Koga, Kenji Kuroki, Jun Nakazato, Tomoichiro Ohta, Yoshitaka Yamazaki
-
Patent number: 6188054Abstract: The present invention relates to an induction heating apparatus for heating an image on a recording material which has an electric conductor, a first coil, for inducing an eddy current in the electric conductor disposed over a longitudinal direction of the electric conductor, a second coil disposed so as to overlap an end portion of the first coil, a first power supply for supplying an alternating current to the first coil, a second power supply for supplying an alternating current to the second coil, a phase shifting circuit for controlling a phase of the alternating current supplied to the second coil, and control means for controlling the phase shifting circuit in conformity with a temperature of the electric conductor.Type: GrantFiled: January 19, 2000Date of Patent: February 13, 2001Assignee: Canon Kabushiki KaishaInventor: Tomoichiro Ohta
-
Patent number: 6181905Abstract: The present invention relates to an image heating apparatus, in which an end of a first magnetic portion and an end of a second magnetic portion are present within a width along a recording material moving direction of a nip, and a width of a gap along a recording material moving direction is different with respect to a direction which is orthogonal to the recording material moving direction.Type: GrantFiled: January 11, 2000Date of Patent: January 30, 2001Assignee: Canon Kabushiki KaishaInventors: Tomoichiro Ohta, Takashi Fujita, Osamu Watanabe, Ryuichiro Maeyama, Yasuhiro Hayashi