Patents by Inventor Tadashi Ohba
Tadashi Ohba 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: 20240136314Abstract: A stacked chip is provided comprising a first semiconductor chip and a second semiconductor chip, wherein the first semiconductor chip has a first supporting substrate and a first circuit layer including a first region in which a first circuit is formed and a second region in which a second circuit is formed, the second semiconductor chip has a second supporting substrate, a second circuit layer including a third region that corresponds to a position of the first region and a fourth region that corresponds to a position of the second region and in which the second circuit is formed, a first embedded portion embedded in a first hole portion penetrating through the third region and extending to an inside of the second supporting substrate, and a first through via that penetrates through the first embedded portion and the second supporting substrate, and is electrically conducted with the first circuit.Type: ApplicationFiled: August 15, 2023Publication date: April 25, 2024Inventors: Shinji SUGATANI, Takayuki OHBA, Norio CHUJO, Koji SAKUI, Tadashi FUKUDA
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Patent number: 9069311Abstract: An image forming apparatus includes a toner image forming section, a fixing section, and a control section. The toner image forming section forms a toner image based on image data for printing on printing paper. The fixing section fixes the toner image on the printing paper through thermocompression. The control section controls a toner image forming operation by the toner image forming section and a fixing operation by the fixing section. The control section calculates a size parameter associated with a size of a uniform density region included in the toner image based on the image data for the printing and controls a fixing temperature of the fixing section according to a calculation result.Type: GrantFiled: April 15, 2013Date of Patent: June 30, 2015Assignee: KYOCERA Document Solutions Inc.Inventor: Tadashi Ohba
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Publication number: 20130287423Abstract: An image forming apparatus includes a toner image forming section, a fixing section, and a control section. The toner image forming section forms a toner image based on image data for printing on printing paper. The fixing section fixes the toner image on the printing paper through thermocompression. The control section controls a toner image forming operation by the toner image forming section and a fixing operation by the fixing section. The control section calculates a size parameter associated with a size of a uniform density region included in the toner image based on the image data for the printing and controls a fixing temperature of the fixing section according to a calculation result.Type: ApplicationFiled: April 15, 2013Publication date: October 31, 2013Applicant: KYOCERA Document Solutions Inc.Inventor: Tadashi Ohba
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Patent number: 8548343Abstract: An image forming apparatus including an image carrying member, a detecting section, and a linear-speed deriving section. The image carrying member carries a toner image. The detecting section detects passages of a mark, provided on the image carrying member, at a plurality of predetermined detection positions. The linear-speed deriving section determines a linear speed of the image carrying member from times at which the detecting section detects the passage of the mark.Type: GrantFiled: February 17, 2011Date of Patent: October 1, 2013Assignee: Kyocera Document Solutions Inc.Inventors: Keisuke Isoda, Tadashi Ohba, Masaru Watanabe, Atsushi Ishizaki, Hiroki Tanaka
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Publication number: 20110206398Abstract: An image forming apparatus including an image carrying member, a detecting section, and a linear-speed deriving section. The image carrying member carries a toner image. The detecting section detects passages of a mark, provided on the image carrying member, at a plurality of predetermined detection positions. The linear-speed deriving section determines a linear speed of the image carrying member from times at which the detecting section detects the passage of the mark.Type: ApplicationFiled: February 17, 2011Publication date: August 25, 2011Applicant: KYOCERA MITA CORPORATIONInventors: Keisuke Isoda, Tadashi Ohba, Masaru Watanabe, Atsushi Ishizaki, Hiroki Tanaka
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Patent number: 7860444Abstract: A fixing device comprises a thermally fixing roller, a belt, and pushing means which pushes the belt toward the thermally fixing roller. A nipping region is formed between the belt and the thermally fixing roller. A maximum pressure is produced in an upstream end region of the thermally fixing roller in the direction of rotation in the nipping region, another maximum pressure is produced in a downstream end region thereof in the direction of rotation in the nipping region, and a pressure is produced in an intermediate region, which pressure being not higher than the maximum pressure in the upstream end region and not higher than the another maximum pressure in the downstream end region.Type: GrantFiled: October 29, 2008Date of Patent: December 28, 2010Assignee: Kyocera Mita CorporationInventors: Hiroshi Ito, Haruo Koyama, Takao Besshi, Nobuyuki Kashiwagi, Junko Ito, Tadashi Ohba, Toshimitsu Takeuchi
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Publication number: 20090129834Abstract: A fixing device comprises a thermally fixing roller, a belt, and pushing means which pushes the belt toward the thermally fixing roller. A nipping region is formed between the belt and the thermally fixing roller. A maximum pressure is produced in an upstream end region of the thermally fixing roller in the direction of rotation in the nipping region, another maximum pressure is produced in a downstream end region thereof in the direction of rotation in the nipping region, and a pressure is produced in an intermediate region, which pressure being not higher than the maximum pressure in the upstream end region and not higher than the another maximum pressure in the downstream end region.Type: ApplicationFiled: October 29, 2008Publication date: May 21, 2009Inventors: Hiroshi Ito, Haruo Koyama, Takao Besshi, Nobuyuki Kashiwagi, Junko Ito, Tadashi Ohba, Toshimitsu Takeuchi
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Patent number: 7466952Abstract: A fixing device comprises a thermally fixing roller, a belt, and pushing means which pushes the belt toward the thermally fixing roller. A nipping region is formed between the belt and the thermally fixing roller. A maximum pressure is produced in an upstream end region of the thermally fixing roller in the direction of rotation in the nipping region, another maximum pressure is produced in a downstream end region thereof in the direction of rotation in the nipping region, and a pressure is produced in an intermediate region, which pressure being not higher than the maximum pressure in the upstream end region and not higher than the another maximum pressure in the downstream end region.Type: GrantFiled: October 19, 2005Date of Patent: December 16, 2008Assignee: Kyocera Mita CorporationInventors: Hiroshi Ito, Haruo Koyama, Takao Besshi, Nobuyuki Kashiwagi, Junko Ito, Tadashi Ohba, Toshimitsu Takeuchi
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Publication number: 20070025784Abstract: A fixing device comprises a thermally fixing roller, a belt, and pushing means which pushes the belt toward the thermally fixing roller. A nipping region is formed between the belt and the thermally fixing roller. A maximum pressure is produced in an upstream end region of the thermally fixing roller in the direction of rotation in the nipping region, another maximum pressure is produced in a downstream end region thereof in the direction of rotation in the nipping region, and a pressure is produced in an intermediate region, which pressure being not higher than the maximum pressure in the upstream end region and not higher than the another maximum pressure in the downstream end region.Type: ApplicationFiled: October 19, 2005Publication date: February 1, 2007Inventors: Hiroshi Ito, Haruo Koyama, Takao Besshi, Nobuyuki Kashiwagi, Junko Ito, Tadashi Ohba, Toshimitsu Takeuchi
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Publication number: 20060192843Abstract: Provided are an LED-array exposing apparatus and image forming apparatus using the same wherein one or more LED-array chips which mount LEDs corresponding to pixels are employed. LED light intensities are compensated, taking into consideration distance variations between the LED-array chips, a photoreceptor sensitivity and a development bias voltage, thereby reducing an image density variation and black or white longitudinal lines along the photoreceptor rotation direction. The compensation circuit receives image signals and photoreceptor sensitivity, and compensates the light intensities, on the basis of prescribed ligh intensity compensation values and the LED-array chip distances. The compensated image signals together with timing clocks are sent to the LED-array exposing apparatus.Type: ApplicationFiled: January 31, 2006Publication date: August 31, 2006Applicant: Kyocera Mita CorporationInventor: Tadashi Ohba
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Patent number: 7019767Abstract: When intending gradational representation of each of the dots composing the image by changing the amount of light emission of each of the dots composing an image by changing the amount of light emission of said light emitting diode, the magnitude of each of the dots becomes reduced resulting in unstable reproducibility of dot. This causes damage in the regularity of the distribution of image density and the graininess of the printed image increases. The invention aims to provide an image forming apparatus which can decrease granularity (graininess) by simple and inexpensive construction by defocusing on the photo conductor the light ray passing through the lens array of the exposing device in the image forming apparatus in accordance with the percentage of the luminous dots changed in the amount of light emission among the dots composing the image. This prevents the occurrence of irregular density distribution in the latent image on the photo conductor drum.Type: GrantFiled: November 25, 2003Date of Patent: March 28, 2006Assignee: Kyocera CorporationInventors: Tadashi Ohba, Jun Nakai
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Publication number: 20050024468Abstract: The object is to provide an exposure unit capable of forming an image without inconsistencies in density even when resolution in subscanning direction is N times larger than that in the main scanning direction.Type: ApplicationFiled: May 28, 2004Publication date: February 3, 2005Applicant: Kyocera Mita CorporationInventors: Tadashi Ohba, Jun Nakai
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Publication number: 20040135877Abstract: When intending gradational representation of each of the dots composing the image by changing the amount of light emission of each of the dots composing an image by changing the amount of light emission of said light emitting diode, the magnitude of each of the dots becomes reduced resulting in unstable reproducibility of dot. This causes damage in the regularity of the distribution of image density and the graininess of the printed image increases. The invention aims to provide an image forming apparatus which can decrease granularity (graininess) by simple and inexpensive construction by defocusing on the photo conductor the light ray passing through the lens array of the exposing device in the image forming apparatus in accordance with the percentage of the luminous dots changed in the amount of light emission among the dots composing the image. This prevents the occurrence of irregular density distribution in the latent image on the photo conductor drum.Type: ApplicationFiled: November 25, 2003Publication date: July 15, 2004Applicant: Kyocera CorporationInventors: Tadashi Ohba, Jun Nakai
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Patent number: 5729800Abstract: An electrophotographic apparatus using an a-Si photosensitive drum. The a-Si photosensitive drum has a thickness between 2 and 25 .mu.m. The initial charging potential on the photosensitive drum is set to 450V or below. The center exposure wavelength of an exposure means is set to 700 nm or above. The photosensitive drum includes a photoconductive layer formed as a thin film a-Si layer having a temperature characteristic of 1.0 V/.degree.C. or below. For realizing low charging potential and low electric field development, the thickness d of the photoconductive layer in the photosensitive drum is set to 2 to 24 .mu.m, the relative dielectric constant .epsilon.r is set to 2 or above, and the ratio d/.epsilon.r is set to 9 or below.Type: GrantFiled: October 27, 1994Date of Patent: March 17, 1998Assignee: Kyocera CorporationInventors: Tadashi Ohba, Norio Tomiie, Keiji Itsukushima, Hisashi Higuchi