Patents by Inventor Hideki Ohnishi
Hideki Ohnishi 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: 10388251Abstract: A display device (10) includes: an integrated control unit (31) that allows selection from among at least a high-luminance mode and a luminance-unevenness-suppression-preferred mode in accordance with an input instruction; and an unevenness correction unit (36) that performs color unevenness correction for each pixel in both the high-luminance mode and the luminance-unevenness-suppression-preferred mode. In the luminance-unevenness-suppression-preferred mode, the unevenness correction unit (36) performs a pixel value limitation process for uniformly shifting, for each pixel, a pixel value in image data to a lower pixel value to thereby decrease the pixel value to a pixel value lower than that in the high-luminance mode, and thereafter, performs the color unevenness correction. Accordingly, even if the use of the display device varies, image processing that is appropriate for various uses is implemented.Type: GrantFiled: September 24, 2015Date of Patent: August 20, 2019Assignee: SHARP KABUSHIKI KAISHAInventors: Terumitsu Katougi, Hideki Ohnishi, Yasushi Adachi, Makoto Hayasaki, Gaku Furuichi
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Publication number: 20170316754Abstract: A display device (10) includes: an integrated control unit (31) that allows selection from among at least a high-luminance mode and a luminance-unevenness-suppression-preferred mode in accordance with an input instruction; and an unevenness correction unit (36) that performs color unevenness correction for each pixel in both the high-luminance mode and the luminance-unevenness-suppression-preferred mode. In the luminance-unevenness-suppression-preferred mode, the unevenness correction unit (36) performs a pixel value limitation process for uniformly shifting, for each pixel, a pixel value in image data to a lower pixel value to thereby decrease the pixel value to a pixel value lower than that in the high-luminance mode, and thereafter, performs the color unevenness correction. Accordingly, even if the use of the display device varies, image processing that is appropriate for various uses is implemented.Type: ApplicationFiled: September 24, 2015Publication date: November 2, 2017Inventors: Terumitsu KATOUGI, Hideki OHNISHI, Yasushi ADACHI, Makoto HAYASAKI, Gaku FURUICHI
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Patent number: 9513169Abstract: A display calibration system includes: a display section subject to calibration; a correction data outputting section configured to perform a calibration process to determine, for each of the pixels of the display section, correction data for non-uniformity correction; and a first storage section configured to store reference data to be used in the calibration process. The reference data represents, for individual color patches of a first predetermined number, correspondences between RGB values and reference values. The correction data outputting section obtains, on a basis of the reference data and the measurement values of the color patches of a second predetermined number that is less than the first predetermined number, the pieces of correction data with respect to RGB values of the individual color patches of the predetermined second number. With this arrangement, it is possible to shorten a processing time of the calibration process.Type: GrantFiled: December 9, 2014Date of Patent: December 6, 2016Assignee: Sharp Kabushiki KaishaInventors: Hideki Ohnishi, Terumitsu Katougi, Makoto Hayasaki, Gaku Furuichi, Yasushi Adachi
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Publication number: 20150243251Abstract: The present invention includes: an input section (11) which accepts, for individual displays, first adjustment values; a calculation section (46) which corrects measurement results of colors of plural regions of each display displaying a color calibration image by using the first adjustment values inputted by the input section, obtains color differences between the adjacent displays, with correspondence to arrangement of the displays, based on measurement results of bordering regions of the displays out of the measurement results or post-correction measurement results, and then determines a maximum color difference from the color differences; a second storage section (48) which stores the maximum color difference being associated with the first adjustment values; and an adjustment section (49) which reads, from the second storage section, the first adjustment values minimizing the maximum color difference, and then set, for the individual displays, the read first adjustment values to perform color adjustmentType: ApplicationFiled: September 6, 2013Publication date: August 27, 2015Applicant: Sharp Kabushiki KaishaInventor: Hideki Ohnishi
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Publication number: 20150213771Abstract: A display calibration system includes: a display section subject to calibration; a correction data outputting section configured to perform a calibration process to determine, for each of the pixels of the display section, correction data for non-uniformity correction; and a first storage section configured to store reference data to be used in the calibration process. The reference data represents, for individual color patches of a first predetermined number, correspondences between RGB values and reference values. The correction data outputting section obtains, on a basis of the reference data and the measurement values of the color patches of a second predetermined number that is less than the first predetermined number, the pieces of correction data with respect to RGB values of the individual color patches of the predetermined second number. With this arrangement, it is possible to shorten a processing time of the calibration process.Type: ApplicationFiled: December 9, 2014Publication date: July 30, 2015Applicant: SHARP KABUSHIKI KAISHAInventors: Hideki OHNISHI, Terumitsu KATOUGI, Makoto HAYASAKI, Gaku FURUICHI, Yasushi ADACHI
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Patent number: 8300141Abstract: The invention accomplishes an image capture apparatus capable of allowing a user to more easily attain, as compared to a conventional image capture apparatus, image data of a captured image which includes no blown-out highlights or loss of shadow detail throughout an entire image.Type: GrantFiled: September 15, 2010Date of Patent: October 30, 2012Assignee: Sharp Kabushiki KaishaInventors: Hideki Ohnishi, Makoto Hayasaki
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Publication number: 20110063456Abstract: The invention accomplishes an image capture apparatus capable of allowing a user to more easily attain, as compared to a conventional image capture apparatus, image data of a captured image which includes no blown-out highlights or loss of shadow detail throughout an entire image.Type: ApplicationFiled: September 15, 2010Publication date: March 17, 2011Inventors: Hideki OHNISHI, Makoto HAYASAKI
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Patent number: 7885561Abstract: A needle electrode having a pointed section is provided so as to face a charge-target object, and a voltage to be applied to the needle electrode is set so that 2?(E2·S2)/(E1·S1)?5 is satisfied, where an ionization area A1 indicates an area where ionization occurs to oxygen molecules in an atmosphere; a dissociation area A2 indicates an area where dissociation occurs to the oxygen molecules in the atmosphere (excluding the ionization area A1); E1 indicates an average electric field strength in the ionization area A1; E2 indicates an average electric field strength in the dissociation area A2; S1 indicates square measure of the ionization area A1 on a plane which includes a straight line connecting the needle electrode and the charge-target object so that a distance between the needle electrode and the charge-target object becomes a shortest distance; and S1 indicates square measure of the dissociation area A2 of the plane.Type: GrantFiled: June 17, 2008Date of Patent: February 8, 2011Assignee: Sharp Kabushiki KaishaInventors: Hideki Ohnishi, Toshiaki Kagawa
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Patent number: 7647014Abstract: The present invention is made to provide a pretransfer charging device, which allows (i) reduction of generation of discharge products such as ozone and nitroxide, (ii) excellent uniform charging, (iii) continuous stable charging for a long period of time, and (iv) restraint of distortion of a toner image. The pretransfer charging device includes (i) ion generation needles each provided face to face with an image carrier such as a photoconductor drum or an intermediating transfer belt, and (ii) a high-voltage power supply for applying a negative voltage to each of the ion generation needles. The voltage to be applied from the high-voltage power supply is not less than an ion production threshold voltage but is less than a corona discharge threshold voltage. With this, no corona discharge occurs but negative ions can be generated. This makes it possible to solve various problems caused due to the corona discharge.Type: GrantFiled: February 9, 2007Date of Patent: January 12, 2010Assignee: Sharp Kabushiki KaishaInventors: Toshiaki Kagawa, Hideki Ohnishi, Hiroshi Kida, Yoshiaki Masuda
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Publication number: 20080317503Abstract: A needle electrode having a pointed section is provided so as to face a charge-target object, and a voltage to be applied to the needle electrode is set so that 2?(E2·S2)/(E1·S1)?5 is satisfied, where an ionization area A1 indicates an area where ionization occurs to oxygen molecules in an atmosphere; a dissociation area A2 indicates an area where dissociation occurs to the oxygen molecules in the atmosphere (excluding the ionization area A1); E1 indicates an average electric field strength in the ionization area A1; E2 indicates an average electric field strength in the dissociation area A2; S1 indicates square measure of the ionization area A1 on a plane which includes a straight line connecting the needle electrode and the charge-target object so that a distance between the needle electrode and the charge-target object becomes a shortest distance; and S1 indicates square measure of the dissociation area A2 of the plane.Type: ApplicationFiled: June 17, 2008Publication date: December 25, 2008Applicant: SHARP KABUSHIKI KAISHAInventors: Hideki Ohnishi, Toshiaki Kagawa
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Publication number: 20070212111Abstract: Ions are produced without causing any accompanying corona discharge by applying, to ion generation needles positioned so as not to contact a photoconductor drum, a voltage higher than or equal to an ion production threshold voltage and lower than a corona discharge threshold voltage. The photoconductor drum is charged by the ions produced. Accordingly, a charging device is provided which is capable of stable charging with high uniformity over a long period whilst reducing the production of ozone, nitrogen oxides, and other discharge byproducts.Type: ApplicationFiled: February 12, 2007Publication date: September 13, 2007Applicant: SHARP KABUSHIKI KAISHAInventors: Toshiaki Kagawa, Tohru Sakuwa, Hideki Ohnishi
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Publication number: 20070201910Abstract: The present invention is made to provide a pretransfer charging device, which allows (i) reduction of generation of discharge products such as ozone and nitroxide, (ii) excellent uniform charging, (iii) continuous stable charging for a long period of time, and (iv) restraint of distortion of a toner image. The pretransfer charging device includes (i) ion generation needles each provided face to face with an image carrier such as a photoconductor drum or an intermediating transfer belt, and (ii) a high-voltage power supply for applying a negative voltage to each of the ion generation needles. The voltage to be applied from the high-voltage power supply is not less than an ion production threshold voltage but is less than a corona discharge threshold voltage. With this, no corona discharge occurs but negative ions can be generated. This makes it possible to solve various problems caused due to the corona discharge.Type: ApplicationFiled: February 9, 2007Publication date: August 30, 2007Applicant: SHARP KABUSHIKI KAISHAInventors: Toshiaki Kagawa, Hideki Ohnishi, Hiroshi Kida, Yoshiaki Masuda
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Patent number: 6676868Abstract: A method of manufacturing a separator for a polymer electrolyte fuel cell in which the specific resistance is small, and the coefficient of thermal conductivity and the gas shielding property are high and have high strength. The sintering material comprises a phenol resin coated to the surface of a powder of carbon, and the plate is a metallic plate having plating on both surfaces. After the metallic plate is arranged in a mold provided with grooves, the sintering material is filled to both sides of the metallic plate, and then they are heated and sintered. The separator for a fuel cell becomes homogeneous, and, as a result, the gas shielding property rises with high strength, because phenol resin has been uniformly distributed in the sintering material. Moreover, because oxides are not generated on the surfaces of the separator by sintering, the specific resistance will be relatively small.Type: GrantFiled: June 26, 2002Date of Patent: January 13, 2004Assignee: Dynax CorporationInventors: Hideki Ohnishi, Ryuichi Saito
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Publication number: 20030137074Abstract: A method of manufacturing a separator for a polymer electrolyte fuel cell in which the specific resistance is small, and the coefficient of thermal conductivity and the gas shielding property are high and have high strength. The sintering material comprises a phenol resin coated to the surface of a powder of carbon, and the plate is a metallic plate having plating on both surfaces. After the metallic plate is arranged in a mold provided with grooves, the sintering material is filled to both sides of the metallic plate, and then they are heated and sintered. The separator for a fuel cell becomes homogeneous, and, as a result, the gas shielding property rises with high strength, because phenol resin has been uniformly distributed in the sintering material. Moreover, because oxides are not generated on the surfaces of the separator by sintering, the specific resistance will be relatively small.Type: ApplicationFiled: June 26, 2002Publication date: July 24, 2003Inventors: Hideki Ohnishi, Ryuichi saito
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Patent number: 6330408Abstract: A transfer apparatus having a photoconductor drum for holding thereon an image formed by toner charged with a negative polarity and a transfer roller disposed opposite the photoconductor drum, in which paper is fed to an area where the photoconductor drum and the transfer roller face each other and the toner image on the photoconductor drum is transferred to the paper by using a unidirectional transfer electric field formed by the transfer roller. The transfer roller also serves as charge supply control device for supplying a charge to the toner held on the photoconductor drum to thereby substantially neutralize the charge of the toner while retaining the negative polarity of the toner.Type: GrantFiled: October 27, 1999Date of Patent: December 11, 2001Assignee: Sharp Kabushiki KaishaInventors: Shirou Wakahara, Tomohiro Oikawa, Yukikazu Kamei, Hideki Ohnishi, Hiroshi Doshoda
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Patent number: 6097923Abstract: When a grounded conductive roller touches a transfer drum through a transfer material while a voltage is applied to a conductor layer, charges having a polarity opposite to the polarity of the voltage applied to the conductor layer are generated over the transfer material, thereby making it possible to attract the transfer material to the dielectric layer. Since the voltage is applied to the conductor layer, the electrostatic attraction of the transfer material and the toner transfer can be carried out using a single power source. Moreover, since the attraction of the transfer material and the toner transfer are carried out by the charge injection, a lower voltage can be used. Thus, the voltage can be readily controlled while reducing the ozone emission to a relatively low level. Furthermore, since the toner transfer and electrostatic attraction of the transfer material can be carried out using a single power source, the apparatus can be downsized and less expensive.Type: GrantFiled: March 13, 1998Date of Patent: August 1, 2000Assignee: Sharp Kabushiki KaishaInventors: Yoshie Iwakura, Seiichi Yoshida, Hideki Ohnishi, Fumio Shimazu
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Patent number: 6081685Abstract: The object of the invention is to provide a transfer apparatus including a transfer drum which carries a transfer material by electrostatic attraction with reliability, and can prevent the transfer nonuniformity of the image. The transfer drum is so formed that on the surface of a dielectric layer made of cylinder-shaped aluminium, are formed side by side two semiconductor layers each formed by a foamed elastic member, and on the surface of the semiconductor layers are stacked a conductive layer formed by PVDF. The first semiconductor layer is formed under the transfer region within the surface of the transfer drum, and the diameter of cell is set to be in a range of over 0 .mu.m to 50 .mu.m. Also, the second semiconductor layer is formed under the non-transfer region within the surface of the transfer drum, and the diameter of cell is set to a size of 500 .mu.m or more.Type: GrantFiled: January 7, 1999Date of Patent: June 27, 2000Assignee: Sharp Kabushiki KaishaInventors: Yoshinobu Umetani, Hideki Ohnishi, Yukikazu Kamei, Kiyoshi Toizumi, Kouichi Yamauchi, Fumio Shimazu
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Patent number: 6078772Abstract: An image-forming apparatus is provided with: a photoconductor drum having a surface on which a toner image is formed, a transfer drum for transferring the toner image onto a copying material by allowing the copying material to contact the photoconductor drum, and a ground roller for electrostatically attracting the copying material onto the transfer drum prior to transferring the toner image onto the copying material. He transfer drum is constituted by a semi-conductive layer and a dielectric layer that are stacked on a conductive layer. [Supposing that] The nip width between the photoconductor drum and the transfer drum is L1, the rotation speed of the two drums is Vp, and the time constant, which is represented by a product of the resistance and the capacitance between the two drums, is .tau., the relationship represented by L1/Vp<.tau. is satisfied.Type: GrantFiled: September 26, 1997Date of Patent: June 20, 2000Assignee: Sharp Kabushiki KaishaInventors: Toshihiko Takaya, Fumio Shimazu, Seiichi Yoshida, Hideki Ohnishi, Tomohiro Oikawa, Yoshie Iwakura
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Patent number: 6002904Abstract: An image forming apparatus is provided with a photosensitive drum on whose surface a toner image is formed, and image formation is carried out by transferring the toner image onto a transfer material such as paper or OHP sheet which is caused to electrostatically adhere to a surface of a transfer drum while being guided to the photosensitive drum. Alternatively, the toner image formed on the photosensitive drum may be once transferred onto an intermediate transfer drum, then transferred from the intermediate transfer drum onto the transfer material. In the image forming apparatus, a light projecting device for projecting light onto the photosensitive drum is provided on an upstream side to a toner image transfer position and on a downstream side to a development position on the photosensitive drum. Execution and suspension of the light projecting operation of the light projecting device is controlled depending on a toner type.Type: GrantFiled: November 21, 1997Date of Patent: December 14, 1999Assignee: Sharp Kabushiki KaishaInventors: Seiichi Yoshida, Fumio Shimazu, Hideki Ohnishi
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Patent number: 5987292Abstract: A transfer device which transfers a developer image formed on a surface of a photoreceptor drum to a transfer sheet is arranged so as to include a transfer drum for carrying the transfer sheet on a peripheral surface thereof, an electrode roller which can be moved to contact the transfer drum via the transfer sheet, and which can be moved apart from the transfer drum, and a control section for controlling contact start conditions between the transfer drum and the electrode roller. When the transfer sheet passes a spacing between the transfer drum and the electrode roller, the control section controls the contact start conditions in such a manner that a force is not exerted to a leading end portion of the transfer sheet from the electrode roller so as to separate the leading end portion from the transfer drum.Type: GrantFiled: July 22, 1998Date of Patent: November 16, 1999Assignee: Sharp Kabushiki KaishaInventor: Hideki Ohnishi