Patents by Inventor Minoru Hayasaki
Minoru Hayasaki 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: 9606482Abstract: A fixing apparatus configured to include a rotational member having a conductive layer, a coil having a helical shape, a resonance circuit including a resonance capacitor and configured to be formed together with the rotational member and the coil, a first converter driving the resonance circuit, a second converter used to control power to be supplied to the first converter, a frequency setting unit configured to set a driving frequency of the first converter according to at least one of a size of the recording material and a temperature at a sheet non-passing portion of the rotational member, and a power control unit controlling the second converter according to a temperature at a sheet passing portion of the rotational member to control the power to be supplied to the first converter from the second converter, wherein the conductive layer is caused to generate heat by electromagnetic induction.Type: GrantFiled: April 20, 2016Date of Patent: March 28, 2017Assignee: Canon Kabushiki KaishaInventors: Minoru Hayasaki, Hiroshi Mano, Aoji Isono, Masatoshi Itoh, Yusuke Isomi
-
Patent number: 9599950Abstract: The power supply apparatus includes a transformer, a switch element that drives a primary side of the transformer, and a control unit that controls a drive frequency of the switch element, wherein when a state of driving the switch element at a first drive frequency is shifted to a state of driving the switch element at a second drive frequency lower than the first drive frequency, the control unit turns on the switch element at a first timing in which a displacement amount of the transformer caused by the drive of the transformer becomes a first displacement amount and at a second timing in which the displacement of the transformer becomes a second displacement amount smaller than the first displacement amount.Type: GrantFiled: June 4, 2014Date of Patent: March 21, 2017Assignee: CANON KABUSHIKI KAISHAInventor: Minoru Hayasaki
-
Patent number: 9501010Abstract: A fixing apparatus includes a tubular rotation member including a conductive layer, a helical coil, a resonance circuit, including a resonance capacitor, formed with the rotation member and the coil, a resonance inverter configured to control the resonance circuit, and a control unit configured to control electric power supplied to the resonance inverter, wherein the conductive layer generates heat with electromagnetic induction caused by magnetic flux generated through the coil, wherein the control unit sets a driving frequency of the resonance inverter according to at least one of a size of the recording medium and a temperature of a non-sheet-passing portion of the rotation member, and wherein the control unit changes a resonance frequency of the resonance circuit according to the set driving frequency.Type: GrantFiled: July 20, 2015Date of Patent: November 22, 2016Assignee: Canon Kabushiki KaishaInventors: Masatoshi Itoh, Yusuke Isomi, Aoji Isono, Minoru Hayasaki, Hiroshi Mano
-
Publication number: 20160327892Abstract: Disclosed is a cylindrical rotary member including a conductive layer; a coil disposed inside the rotary member, the coil including a helical portion having a helical axis that is substantially parallel to a generatrix direction of the rotary member, the coil forming an alternating magnetic field to generate heat in the conductive layer by electromagnetic induction; a core disposed inside the helical portion, the core inducing a line of magnetic force of the alternating magnetic field; a roller coming in contact with an outer surface of the rotary member to form a fixing nip portion; and a metal stay disposed inside the rotary member, in which an image on a recording material is fixed to the recording material by being heated at the fixing nip portion and the stay is disposed outside the coil and has a shape that does not form an electrical loop around the coil.Type: ApplicationFiled: July 15, 2016Publication date: November 10, 2016Inventors: Akira Kuroda, Hiroshi Mano, Aoji Isono, Minoru Hayasaki, Yuki Nishizawa
-
Patent number: 9417573Abstract: Disclosed is a cylindrical rotary member including a conductive layer; a coil disposed inside the rotary member, the coil including a helical portion having a helical axis that is substantially parallel to a generatrix direction of the rotary member, the coil forming an alternating magnetic field to generate heat in the conductive layer by electromagnetic induction; a core disposed inside the helical portion, the core inducing a line of magnetic force of the alternating magnetic field; a roller coming in contact with an outer surface of the rotary member to form a fixing nip portion; and a metal stay disposed inside the rotary member, in which an image on a recording material is fixed to the recording material by being heated at the fixing nip portion and the stay is disposed outside the coil and has a shape that does not form an electrical loop around the coil.Type: GrantFiled: December 11, 2014Date of Patent: August 16, 2016Assignee: Canon Kabushiki KaishaInventors: Akira Kuroda, Hiroshi Mano, Aoji Isono, Minoru Hayasaki, Yuki Nishizawa
-
Publication number: 20160231679Abstract: A fixing device configured to fix an image on a recording material, includes: a rotary member including an electroconductive layer; a coil which has a spiral shaped portion and is disposed in the inside of the rotary member; and a core disposed in the spiral shaped portion; with magnetic resistance of the core being, with an area from one end to the other end of the maximum passage region of the image on the recording material regarding the generatrix direction, equal to or smaller than 30% of combined magnetic resistance made up of magnetic resistance of the electroconductive layer and magnetic resistance of a region between the electroconductive layer and the core.Type: ApplicationFiled: April 18, 2016Publication date: August 11, 2016Inventors: Yuki Nishizawa, Hiroshi Mano, Minoru Hayasaki, Aoji Isono, Akira Kuroda, Toshio Miyamoto, Michio Uchida, Seiji Uchiyama
-
Publication number: 20160231671Abstract: A fixing apparatus configured to include a rotational member having a conductive layer, a coil having a helical shape, a resonance circuit including a resonance capacitor and configured to be formed together with the rotational member and the coil, a first converter driving the resonance circuit, a second converter used to control power to be supplied to the first converter, a frequency setting unit configured to set a driving frequency of the first converter according to at least one of a size of the recording material and a temperature at a sheet non-passing portion of the rotational member, and a power control unit controlling the second converter according to a temperature at a sheet passing portion of the rotational member to control the power to be supplied to the first converter from the second converter, wherein the conductive layer is caused to generate heat by electromagnetic induction.Type: ApplicationFiled: April 20, 2016Publication date: August 11, 2016Inventors: Minoru Hayasaki, Hiroshi Mano, Aoji Isono, Masatoshi Itoh, Yusuke Isomi
-
Patent number: 9377733Abstract: A fixing device configured to fix an image on a recording material, includes: a rotary member including an electroconductive layer; a coil which has a spiral shaped portion and is disposed in the inside of the rotary member; and a core disposed in the spiral shaped portion; with magnetic resistance of the core being, with an area from one end to the other end of the maximum passage region of the image on the recording material regarding the generatrix direction, equal to or smaller than 30% of combined magnetic resistance made up of magnetic resistance of the electroconductive layer and magnetic resistance of a region between the electroconductive layer and the core.Type: GrantFiled: June 13, 2013Date of Patent: June 28, 2016Assignee: Canon Kabushiki KaishaInventors: Yuki Nishizawa, Hiroshi Mano, Minoru Hayasaki, Aoji Isono, Akira Kuroda, Toshio Miyamoto, Michio Uchida, Seiji Uchiyama
-
Patent number: 9372451Abstract: In a fixing device, an alternating current is caused to flow through a coil so as to causes an electrically conductive layer of a rotating member to generate heat, and an unfixed image on a recording medium is heat fixed onto the recording medium by the heat generated by the electrically conductive layer. A frequency range of the alternating current is from 20.5 kHz to 100 kHz. With respect to a generatrix direction of the rotating member, a magnetic member and a spirally shaped portion of the coil have lengths, with which the magnetic member and the spirally shaped portion extend beyond both end portions of the rotating member.Type: GrantFiled: December 15, 2014Date of Patent: June 21, 2016Assignee: Canon Kabushiki KaishaInventors: Aoji Isono, Masatoshi Itoh, Yusuke Isomi, Hiroshi Mano, Minoru Hayasaki, Yuki Nishizawa, Akira Kuroda
-
Patent number: 9348277Abstract: A fixing apparatus configured to include a rotational member having a conductive layer, a coil having a helical shape, a resonance circuit including a resonance capacitor and configured to be formed together with the rotational member and the coil, a first converter driving the resonance circuit, a second converter used to control power to be supplied to the first converter, a frequency setting unit configured to set a driving frequency of the first converter according to at least one of a size of the recording material and a temperature at a sheet non-passing portion of the rotational member, and a power control unit controlling the second converter according to a temperature at a sheet passing portion of the rotational member to control the power to be supplied to the first converter from the second converter, wherein the conductive layer is caused to generate heat by electromagnetic induction.Type: GrantFiled: July 20, 2015Date of Patent: May 24, 2016Assignee: Canon Kabushiki KaishaInventors: Minoru Hayasaki, Hiroshi Mano, Aoji Isono, Masatoshi Itoh, Yusuke Isomi
-
Patent number: 9342009Abstract: A fixing device configured to fix an image on a recording material, includes: a rotary member including an electroconductive layer; a coil which has a spiral shaped portion and is disposed in the inside of the rotary member; and a core disposed in the spiral shaped portion; with magnetic resistance of the core being, with an area from one end to the other end of the maximum passage region of the image on the recording material regarding the generatrix direction, equal to or smaller than 30% of combined magnetic resistance made up of magnetic resistance of the electroconductive layer and magnetic resistance of a region between the electroconductive layer and the core.Type: GrantFiled: June 13, 2013Date of Patent: May 17, 2016Assignee: Canon Kabushiki KaishaInventors: Yuki Nishizawa, Hiroshi Mano, Minoru Hayasaki, Aoji Isono, Akira Kuroda, Toshio Miyamoto, Michio Uchida, Seiji Uchiyama
-
Patent number: 9329561Abstract: The power supply apparatus includes a transformer having a primary and secondary sides, a first line and a second line to which an AC voltage is input from an AC power supply, a rectifying and smoothing unit that rectifies and smoothes the AC voltage, a shut-off unit provided between the first line and the rectifying and smoothing unit, a switching element that switches a current from the rectifying and smoothing unit to the primary side of the transformer, a first overvoltage detection unit that outputs a voltage corresponding to the AC voltage, a second overvoltage detection unit that outputs an overvoltage detection signal; and a control unit that controls the shut-off unit to shut off the input of the AC voltage.Type: GrantFiled: February 24, 2014Date of Patent: May 3, 2016Assignee: CANON KABUSHIKI KAISHAInventors: Minoru Hayasaki, Nozomu Nakajima, Yasuhiro Nakata, Hiroshi Mano, Takao Kawazu
-
Patent number: 9323186Abstract: An image forming apparatus for forming an image on a recording material includes: an image forming portion for forming the image on the recording material; a fixing portion, including a cylindrical rotatable member having a heat generating layer, for fixing the image on the recording material by heat of the rotatable member; and a temperature detecting portion for detecting a temperature of the rotatable member. The temperature detecting portion monitors a temperature change amount during one rotation of the rotatable member. The rotatable member is heated by the heat generating layer generating heat by a flow of a current in a circumferential direction of the rotatable member. Depending on the temperature change amount, a notification of an abnormality of the image forming apparatus is generated.Type: GrantFiled: December 16, 2014Date of Patent: April 26, 2016Assignee: Canon Kabushiki KaishaInventors: Hiroshi Kita, Minoru Hayasaki, Kimitaka Ichinose, Michio Uchida
-
Patent number: 9304478Abstract: The power supply apparatus includes a first capacitor and a second capacitor that insulate a primary side and a secondary side of the power supply apparatus from each other. The power supply apparatus further includes an inductor, a first switch element connected to the inductor and to the first capacitor, and a second switch element connected to the inductor and to the second capacitor. The power supply apparatus controls the first switch element and the second switch element so that, when the first switch element is turned on, the second switch element is turned on.Type: GrantFiled: December 10, 2014Date of Patent: April 5, 2016Assignee: CANON KABUSHIKI KAISHAInventors: Minoru Hayasaki, Nobuyuki Uchiyama, Aoji Isono, Takashi Kawana
-
Publication number: 20160026127Abstract: A fixing apparatus configured to include a rotational member having a conductive layer, a coil having a helical shape, a resonance circuit including a resonance capacitor and configured to be formed together with the rotational member and the coil, a first converter driving the resonance circuit, a second converter used to control power to be supplied to the first converter, a frequency setting unit configured to set a driving frequency of the first converter according to at least one of a size of the recording material and a temperature at a sheet non-passing portion of the rotational member, and a power control unit controlling the second converter according to a temperature at a sheet passing portion of the rotational member to control the power to be supplied to the first converter from the second converter, wherein the conductive layer is caused to generate heat by electromagnetic induction.Type: ApplicationFiled: July 20, 2015Publication date: January 28, 2016Inventors: Minoru Hayasaki, Hiroshi Mano, Aoji Isono, Masatoshi Itoh, Yusuke Isomi
-
Publication number: 20160026130Abstract: A fixing apparatus includes a tubular rotation member including a conductive layer, a helical coil, a resonance circuit, including a resonance capacitor, formed with the rotation member and the coil, a resonance inverter configured to control the resonance circuit, and a control unit configured to control electric power supplied to the resonance inverter, wherein the conductive layer generates heat with electromagnetic induction caused by magnetic flux generated through the coil, wherein the control unit sets a driving frequency of the resonance inverter according to at least one of a size of the recording medium and a temperature of a non-sheet-passing portion of the rotation member, and wherein the control unit changes a resonance frequency of the resonance circuit according to the set driving frequency.Type: ApplicationFiled: July 20, 2015Publication date: January 28, 2016Inventors: Masatoshi Itoh, Yusuke Isomi, Aoji Isono, Minoru Hayasaki, Hiroshi Mano
-
Patent number: 9154043Abstract: A power source device that outputs a DC voltage includes a rectification unit configured to rectify an input pulse voltage, a voltage-current conversion unit disposed on a side where the pulse voltage is input into the rectification unit, a current-voltage conversion unit configured to convert a current from the voltage-current conversion unit into a voltage, and a comparison unit configured to compare the voltage from the current-voltage conversion unit with a reference voltage. An operation of the rectification unit is controlled based on an output from the comparison unit.Type: GrantFiled: October 11, 2012Date of Patent: October 6, 2015Assignee: CANON KABUSHIKI KAISHAInventors: Minoru Hayasaki, Hiroshi Mano
-
Publication number: 20150180349Abstract: The power supply apparatus includes a first capacitor and a second capacitor that insulate a primary side and a secondary side of the power supply apparatus from each other. The power supply apparatus further includes an inductor, a first switch element connected to the inductor and to the first capacitor, and a second switch element connected to the inductor and to the second capacitor. The power supply apparatus controls the first switch element and the second switch element so that, when the first switch element is turned on, the second switch element is turned on.Type: ApplicationFiled: December 10, 2014Publication date: June 25, 2015Inventors: Minoru Hayasaki, Nobuyuki Uchiyama, Aoji Isono, Takashi Kawana
-
Publication number: 20150168895Abstract: An image heating apparatus configured to heat an image formed on a recording material includes a cylindrical rotatable member including a conductive layer, a magnetic core inserted through the rotatable member, a coil helically wound around an outer side of the magnetic core within the rotatable member, and an inverter configured to supply an alternating current to the coil. A frequency of the alternating current supplied from the inverter is within a range of 20.5 to 100 kHz. The conductive layer generates heat by electromagnetic induction due to an alternating magnetic field produced from the alternating current supplied to the coil. The coil is wound at an interval of 1 mm or longer.Type: ApplicationFiled: December 16, 2014Publication date: June 18, 2015Inventors: Yuki Nishizawa, Hiroshi Mano, Minoru Hayasaki, Aoji Isono, Yosuke Kitagawa, Katsuhisa Matsunaka, Kimitaka Ichinose, Michio Uchida
-
Publication number: 20150168889Abstract: An image forming apparatus for forming an image on a recording material includes: an image forming portion for forming the image on the recording material; a fixing portion, including a cylindrical rotatable member having a heat generating layer, for fixing the image on the recording material by heat of the rotatable member; and a temperature detecting portion for detecting a temperature of the rotatable member. The temperature detecting portion monitors a temperature change amount during one rotation of the rotatable member. The rotatable member is heated by the heat generating layer generating heat by a flow of a current in a circumferential direction of the rotatable member. Depending on the temperature change amount, abnormality of the image forming apparatus is notified.Type: ApplicationFiled: December 16, 2014Publication date: June 18, 2015Inventors: Hiroshi Kita, Minoru Hayasaki, Kimitaka Ichinose, Michio Uchida