Patents by Inventor Takashi Kawana
Takashi Kawana 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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Publication number: 20230266693Abstract: An image forming apparatus includes a detection unit configured to detect a first scan beam from a first light source; and a control unit. The control unit performs corrections in which a light emission period of scan beams per pixel is changed in accordance with which section is scanned by the scan beams, performs corrections in which a light exposure amount by which the photosensitive member is exposed to light by the scan beams is changed in accordance with which section in the main scanning direction is scanned by the scan beams. Based on a detection timing at which the detection unit has detected the first scan beam. the control unit controls scan start timings at which the scan beams start scanning of the photosensitive member.Type: ApplicationFiled: February 21, 2023Publication date: August 24, 2023Inventors: HIROYUKI FUKUHARA, TAKASHI KAWANA, CHIHIRO SHIRAKAWA
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Patent number: 11322322Abstract: An insulating molded body to be used for an arc extinguishing device of a gas circuit breaker is provided. The insulating molded body includes a fluororesin mixture which contains a fluororesin and an oxygen generator configured to generate oxygen through thermal decomposition at 450° C. or more and 1,150° C. or less with an arc generated when a conduction current is interrupted. The oxygen generator is dispersed in the fluororesin. Also provided is a gas circuit breaker including an insulating nozzle formed of the insulating molded body.Type: GrantFiled: October 30, 2018Date of Patent: May 3, 2022Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Shuichi Hiza, Takashi Kawana, Fumihiko Hosokoshi, Motohiro Sato, Kenji Mimura
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Publication number: 20200357587Abstract: An insulating molded body to be used for an arc extinguishing device of a gas circuit breaker is provided. The insulating molded body includes a fluororesin mixture which contains a fluororesin and an oxygen generator configured to generate oxygen through thermal decomposition at 450° C. or more and 1,150° C. or less with an arc generated when a conduction current is interrupted. The oxygen generator is dispersed in the fluororesin. Also provided is a gas circuit breaker including an insulating nozzle formed of the insulating molded body.Type: ApplicationFiled: October 30, 2018Publication date: November 12, 2020Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Shuichi HIZA, Takashi KAWANA, Fumihiko HOSOKOSHI, Motohiro SATO, Kenji MIMURA
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Patent number: 10197942Abstract: An image-forming apparatus includes a light-irradiation unit configured to move a spot of laser light on a surface of a photosensitive member at a non-constant scanning velocity in a main scanning direction to form a latent image on the photosensitive member, an image data correcting unit configured to correct a length in the main scanning direction of image data by inserting one or more image data pieces into the image data, the number of the image data pieces increasing as the scanning velocity increases, and/or extracting one or more image data pieces from the image data, the number of the image data pieces increasing as the scanning velocity decreases, and a brightness correcting unit configured to correct a brightness of the laser light so that an emission brightness increases as the scanning velocity increases and/or the emission brightness decreases as the scanning velocity decreases.Type: GrantFiled: May 25, 2018Date of Patent: February 5, 2019Assignee: Canon Kabushiki KaishaInventors: Takashi Kawana, Kazuyuki Ishihara, Yuuji Takayama, Hikaru Uchidate, Yoshihiko Tanaka, Hiroyuki Fukuhara, Shuichi Kurokawa
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Publication number: 20180275557Abstract: An image-forming apparatus includes a light-irradiation unit configured to move a spot of laser light on a surface of a photosensitive member at a non-constant scanning velocity in a main scanning direction to form a latent image on the photosensitive member, an image data correcting unit configured to correct a length in the main scanning direction of image data by inserting one or more image data pieces into the image data, the number of the image data pieces increasing as the scanning velocity increases, and/or extracting one or more image data pieces from the image data, the number of the image data pieces increasing as the scanning velocity decreases, and a brightness correcting unit configured to correct a brightness of the laser light so that an emission brightness increases as the scanning velocity increases and/or the emission brightness decreases as the scanning velocity decreases.Type: ApplicationFiled: May 25, 2018Publication date: September 27, 2018Inventors: Takashi Kawana, Kazuyuki Ishihara, Yuuji Takayama, Hikaru Uchidate, Yoshihiko Tanaka, Hiroyuki Fukuhara, Shuichi Kurokawa
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Patent number: 10007208Abstract: An image-forming apparatus includes a light-irradiation unit configured to move a spot of laser light on a surface of a photosensitive member at a non-constant scanning velocity in a main scanning direction to form a latent image on the photosensitive member, an image data correcting unit configured to correct a length in the main scanning direction of image data by inserting one or more image data pieces into the image data, the number of the image data pieces increasing as the scanning velocity increases, and/or extracting one or more image data pieces from the image data, the number of the image data pieces increasing as the scanning velocity decreases, and a brightness correcting unit configured to correct a brightness of the laser light so that an emission brightness increases as the scanning velocity increases and/or the emission brightness decreases as the scanning velocity decreases.Type: GrantFiled: May 1, 2017Date of Patent: June 26, 2018Assignee: Canon Kabushiki KaishaInventors: Takashi Kawana, Kazuyuki Ishihara, Yuuji Takayama, Hikaru Uchidate, Yoshihiko Tanaka, Hiroyuki Fukuhara, Shuichi Kurokawa
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Publication number: 20170235247Abstract: An image-forming apparatus includes a light-irradiation unit configured to move a spot of laser light on a surface of a photosensitive member at a non-constant scanning velocity in a main scanning direction to form a latent image on the photosensitive member, an image data correcting unit configured to correct a length in the main scanning direction of image data by inserting one or more image data pieces into the image data, the number of the image data pieces increasing as the scanning velocity increases, and/or extracting one or more image data pieces from the image data, the number of the image data pieces increasing as the scanning velocity decreases, and a brightness correcting unit configured to correct a brightness of the laser light so that an emission brightness increases as the scanning velocity increases and/or the emission brightness decreases as the scanning velocity decreases.Type: ApplicationFiled: May 1, 2017Publication date: August 17, 2017Inventors: Takashi Kawana, Kazuyuki Ishihara, Yuuji Takayama, Hikaru Uchidate, Yoshihiko Tanaka, Hiroyuki Fukuhara, Shuichi Kurokawa
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Patent number: 9696651Abstract: An image-forming apparatus includes a light-irradiation unit configured to move a spot of laser light on a surface of a photosensitive member at a non-constant scanning velocity in a main scanning direction to form a latent image on the photosensitive member, an image data correcting unit configured to correct a length in the main scanning direction of image data by inserting one or more image data pieces into the image data, the number of the image data pieces increasing as the scanning velocity increases, and/or extracting one or more image data pieces from the image data, the number of the image data pieces increasing as the scanning velocity decreases, and a brightness correcting unit configured to correct a brightness of the laser light so that an emission brightness increases as the scanning velocity increases and/or the emission brightness decreases as the scanning velocity decreases.Type: GrantFiled: March 9, 2016Date of Patent: July 4, 2017Assignee: Canon Kabushiki KaishaInventors: Takashi Kawana, Kazuyuki Ishihara, Yuuji Takayama, Hikaru Uchidate, Yoshihiko Tanaka, Hiroyuki Fukuhara, Shuichi Kurokawa
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Patent number: 9658562Abstract: An image forming apparatus includes: a scanning unit configured to form a latent image on a photosensitive member, wherein a scanning speed changes within a scan line; a control unit configured to perform correction control of a luminance and a light-emitting time of a light source; a holding unit configured to hold profile information indicating a change of the light spot due to an environment or due to a position of the pixel. The holding unit is further configured to hold scanning information indicating the light-emitting time of the light source or the luminance of the light source with respect to a pixel, for correcting a change in the scanning time of the pixel, and the control unit is further configured to perform the correction control based on the scanning information and the profile information.Type: GrantFiled: February 10, 2016Date of Patent: May 23, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Shuhei Watanabe, Hidenori Kanazawa, Takashi Kawana, Junya Kobayashi, Hiroyuki Fukuhara
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Patent number: 9606472Abstract: A pixel distance corrector configured to correct a pixel distance in the main scanning direction so that latent images corresponding to each pixel of image data are formed on the surface of the photosensitive member at substantially equal intervals in the main scanning direction. A controller configured to control a light source to emit light with a first light emission luminance with respect to an image part of the photosensitive member, and a second light emission luminance which is lower than the first light emission luminance, with respect to a non-image part of the photosensitive member. The controller is configured to correct light emission luminance so that the second light emission luminance decreases as the scanning speed decreases.Type: GrantFiled: February 16, 2016Date of Patent: March 28, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Kenichi Fujii, Hidenori Kanazawa, Takashi Kawana
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Publication number: 20160246210Abstract: A pixel distance corrector configured to correct a pixel distance in the main scanning direction so that latent images corresponding to each pixel of image data are formed on the surface of the photosensitive member at substantially equal intervals in the main scanning direction. A controller configured to control a light source to emit light with a first light emission luminance with respect to an image part of the photosensitive member, and a second light emission luminance which is lower than the first light emission luminance, with respect to a non-image part of the photosensitive member. The controller is configured to correct light emission luminance so that the second light emission luminance decreases as the scanning speed decreases.Type: ApplicationFiled: February 16, 2016Publication date: August 25, 2016Inventors: Kenichi Fujii, Hidenori Kanazawa, Takashi Kawana
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Publication number: 20160246209Abstract: An image forming apparatus includes: a scanning unit configured to form a latent image on a photosensitive member, wherein a scanning speed changes within a scan line; a control unit configured to perform correction control of a luminance and a light-emitting time of a light source; a holding unit configured to hold profile information indicating a change of the light spot due to an environment or due to a position of the pixel. The holding unit is further configured to hold scanning information indicating the light-emitting time of the light source or the luminance of the light source with respect to a pixel, for correcting a change in the scanning time of the pixel, and the control unit is further configured to perform the correction control based on the scanning information and the profile information.Type: ApplicationFiled: February 10, 2016Publication date: August 25, 2016Inventors: Shuhei Watanabe, Hidenori Kanazawa, Takashi Kawana, Junya Kobayashi, Hiroyuki Fukuhara
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Publication number: 20160187806Abstract: An image-forming apparatus includes a light-irradiation unit configured to move a spot of laser light on a surface of a photosensitive member at a non-constant scanning velocity in a main scanning direction to form a latent image on the photosensitive member, an image data correcting unit configured to correct a length in the main scanning direction of image data by inserting one or more image data pieces into the image data, the number of the image data pieces increasing as the scanning velocity increases, and/or extracting one or more image data pieces from the image data, the number of the image data pieces increasing as the scanning velocity decreases, and a brightness correcting unit configured to correct a brightness of the laser light so that an emission brightness increases as the scanning velocity increases and/or the emission brightness decreases as the scanning velocity decreases.Type: ApplicationFiled: March 9, 2016Publication date: June 30, 2016Inventors: Takashi Kawana, Kazuyuki Ishihara, Yuuji Takayama, Hikaru Uchidate, Yoshihiko Tanaka, Hiroyuki Fukuhara, Shuichi Kurokawa
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Patent number: 9319553Abstract: An image-forming apparatus includes a light-irradiation unit configured to move a spot of laser light on a surface of a photosensitive member at a non-constant scanning velocity in a main scanning direction to form a latent image on the photosensitive member, an image data correcting unit configured to correct a length in the main scanning direction of image data by inserting one or more image data pieces into the image data, the number of the image data pieces increasing as the scanning velocity increases, and/or extracting one or more image data pieces from the image data, the number of the image data pieces increasing as the scanning velocity decreases, and a brightness correcting unit configured to correct a brightness of the laser light so that an emission brightness increases as the scanning velocity increases and/or the emission brightness decreases as the scanning velocity decreases.Type: GrantFiled: June 1, 2015Date of Patent: April 19, 2016Assignee: Canon Kabushiki KaishaInventors: Takashi Kawana, Kazuyuki Ishihara, Yuuji Takayama, Hikaru Uchidate, Yoshihiko Tanaka, Hiroyuki Fukuhara, Shuichi Kurokawa
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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
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Publication number: 20150365554Abstract: An image-forming apparatus includes a light-irradiation unit configured to move a spot of laser light on a surface of a photosensitive member at a non-constant scanning velocity in a main scanning direction to form a latent image on the photosensitive member, an image data correcting unit configured to correct a length in the main scanning direction of image data by inserting one or more image data pieces into the image data, the number of the image data pieces increasing as the scanning velocity increases, and/or extracting one or more image data pieces from the image data, the number of the image data pieces increasing as the scanning velocity decreases, and a brightness correcting unit configured to correct a brightness of the laser light so that an emission brightness increases as the scanning velocity increases and/or the emission brightness decreases as the scanning velocity decreases.Type: ApplicationFiled: June 1, 2015Publication date: December 17, 2015Inventors: Takashi Kawana, Kazuyuki Ishihara, Yuuji Takayama, Hikaru Uchidate, Yoshihiko Tanaka, Hiroyuki Fukuhara, Shuichi Kurokawa
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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
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Patent number: 8754178Abstract: A resin composition of the present invention includes a maleimide derivative (A) represented by a general formula (1) and a bis-maleimide compound (B) represented by a general formula (2). In the general formula (1), R1 represents a straight chain or branched alkylene group having 1 or more carbon atoms, R2 represents a straight chain or branched alkyl group having 5 or more carbon atoms, and the sum of carbon atoms of R1 and R2 is 10 or less. In the general formula (2), X1 represents —O—, —COO—, or —OCOO—, R3 represents a straight chain or branched alkylene group having 1 to 5 carbon atoms, R4 represents a straight chain or branched alkylene group having 3 to 6 carbon atoms, and m is an integer of 1 or more and 50 or less.Type: GrantFiled: September 7, 2011Date of Patent: June 17, 2014Assignee: Sumitomo Bakelite Co., Ltd.Inventors: Takashi Kawana, Naoya Kanamori, Ryuichi Murayama
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Publication number: 20130158188Abstract: A resin composition of the present invention includes a maleimide derivative (A) represented by a general formula (1) and a bis-maleimide compound (B) represented by a general formula (2). In the general formula (1), R1 represents a straight chain or branched alkylene group having 1 or more carbon atoms, R2 represents a straight chain or branched alkyl group having 5 or more carbon atoms, and the sum of carbon atoms of R1 and R2 is 10 or less. In the general formula (2), X1 represents —O—, —COO—, or -—OCOO—R3, represents a straight chain or branched alkylene group having 1 to 5 carbon atoms, R4 represents a straight chain or branched alkylene group having 3 to 6 carbon atoms, and m is an integer of 1 or more and 50 or less.Type: ApplicationFiled: September 7, 2011Publication date: June 20, 2013Applicant: SUMITOMO BAKELITE CO., LTD.Inventors: Takashi Kawana, Naoya Kanamori, Ryuichi Murayama
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Patent number: 6967727Abstract: An image forming apparatus for forming an image of multilevel image data includes a driving unit for driving an image forming element for image formation, an additional data generating unit for generating a digital signal string based on predetermined additional data, and an input unit for superposing a digital signal string related to the multilevel image data and the digital signal string based on the additional data and inputting the superposed digital signal string to the driving unit.Type: GrantFiled: September 29, 2000Date of Patent: November 22, 2005Assignee: Canon Kabushiki KaishaInventor: Takashi Kawana