Patents by Inventor Yuji Okugawa
Yuji Okugawa 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: 10289029Abstract: A developing device includes: a housing that contains a developing agent; a vibrator that vibrates the housing; and a hardware processor that controls the vibrator at a time when no image is being formed, with the housing mounted on an image forming apparatus, to vibrate the housing such that toner adhered inside the housing is dropped.Type: GrantFiled: July 21, 2017Date of Patent: May 14, 2019Assignee: KONICA MINOLTA, INC.Inventor: Yuji Okugawa
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Publication number: 20180024469Abstract: A developing device includes: a housing that contains a developing agent; a vibrator that vibrates the housing; and a hardware processor that controls the vibrator at a time when no image is being formed, with the housing mounted on an image forming apparatus, to vibrate the housing such that toner adhered inside the housing is dropped.Type: ApplicationFiled: July 21, 2017Publication date: January 25, 2018Inventor: Yuji OKUGAWA
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Patent number: 9442413Abstract: In one aspect of the present invention, exposure timings for a plurality of light beams are adjusted on the basis of a toner concentration of a boundary part between line images formed by one light beam and line images formed by another light beam neighboring the one light beam and a toner concentration of a part except the boundary part in a pattern image. Here, in the pattern image, line images extending in the main-scan direction of a photoreceptor are formed while having a predetermined pitch in the sub-scan direction of the photoreceptor and also the boundary part is arranged so as to be shifted from the sub-scan direction of the photoreceptor, by an image forming section.Type: GrantFiled: May 26, 2015Date of Patent: September 13, 2016Assignee: KONICA MINOLTA, INC.Inventors: Yuji Okugawa, Katsuyuki Hirata
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Publication number: 20150346627Abstract: In one aspect of the present invention, exposure timings for a plurality of light beams are adjusted on the basis of a toner concentration of a boundary part between line images formed by one light beam and line images formed by another light beam neighboring the one light beam and a toner concentration of a part except the boundary part in a pattern image. Here, in the pattern image, line images extending in the main-scan direction of a photoreceptor are formed while having a predetermined pitch in the sub-scan direction of the photoreceptor and also the boundary part is arranged so as to be shifted from the sub-scan direction of the photoreceptor, by an image forming section.Type: ApplicationFiled: May 26, 2015Publication date: December 3, 2015Inventors: Yuji OKUGAWA, Katsuyuki HIRATA
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Patent number: 8730292Abstract: A scanning optical device that scans a photoreceptor with laser light includes a light source, a light outputting section, and a projection. The laser light from the light source is output through the light outputting section so that the photoreceptor is irradiated with the laser light. The projection projects through a partition wall toward the photoreceptor. The light outputting section is disposed in a position separated from the photoreceptor by the partition wall. The projection contains a polygon motor that rotates a polygon mirror to reflect the laser light.Type: GrantFiled: May 23, 2012Date of Patent: May 20, 2014Assignee: Konica Minolta Business Technologies, Inc.Inventors: Ryo Hasegawa, Shinji Morita, Yuji Okugawa, Shinichi Nagao
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Publication number: 20120306989Abstract: A scanning optical device that scans a photoreceptor with laser light includes a light source, a light outputting section, and a projection. The laser light from the light source is output through the light outputting section so that the photoreceptor is irradiated with the laser light. The projection projects through a partition wall toward the photoreceptor. The light outputting section is disposed in a position separated from the photoreceptor by the partition wall. The projection contains a polygon motor that rotates a polygon mirror to reflect the laser light.Type: ApplicationFiled: May 23, 2012Publication date: December 6, 2012Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Ryo HASEGAWA, Shinji MORITA, Yuji OKUGAWA, Shinichi NAGAO
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Patent number: 8279250Abstract: A scanning optical device, comprises a light source to emit a light beam; a deflecting section to deflect the emitted light beam so as to scan; an optical element to make the scanning light beam to converge; and a correcting mechanism to correct an attitude of the optical element so as to adjust a convergence position of the scanning light beam; wherein at least a part of the correcting mechanism is arranged between the deflecting section and the optical element.Type: GrantFiled: May 6, 2010Date of Patent: October 2, 2012Assignee: Konica Minolta Business Technologies, Inc.Inventor: Yuji Okugawa
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Publication number: 20100289864Abstract: A scanning optical device, comprises a light source to emit a light beam; a deflecting section to deflect the emitted light beam so as to scan; an optical element to make the scanning light beam to converge; and a correcting mechanism to correct an attitude of the optical element so as to adjust a convergence position of the scanning light beam; wherein at least a part of the correcting mechanism is arranged between the deflecting section and the optical element.Type: ApplicationFiled: May 6, 2010Publication date: November 18, 2010Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventor: Yuji OKUGAWA
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Patent number: 7009629Abstract: An image forming apparatus including a photoreceptor having an image carrying surface, first and second exposing devices to expose the image carrying surface to form first and second latent images, and first and second developing devices to develop the first and second latent images to form first and second toner images on the image carrying surface. The first exposing device has a light source which emits a light beam, a deflector which deflects the light beam on the image carrying surface to form a scanning line, a first optical system to focus the light beam, and a first adjustor which adjusts an alignment between the first optical system and the image carrying surface for correcting variation of lateral magnification in the primary scanning direction of the optical system so that the first toner image and the second toner image are superposed on a recording sheet.Type: GrantFiled: October 19, 2004Date of Patent: March 7, 2006Assignee: Konica CorporationInventors: Yuji Okugawa, Naoki Tajima, Masaaki Ikeda, Masahiro Shigetomi
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Patent number: 6982736Abstract: The image forming apparatus has light beam passing from the deflector directly to the image carrying surface. The light beam is not bent to the image carrying surface. The apparatus detects movement of optical system and it uses the detected movement to correct the inclination of the optical system.Type: GrantFiled: June 2, 2003Date of Patent: January 3, 2006Assignee: Konica CorporationInventors: Yuji Okugawa, Naoki Tajima, Masaaki Ikeda, Masahiro Shigetomi
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Publication number: 20050078166Abstract: An image forming apparatus comprises a photoreceptor having an image carrying surface, an exposing device to imagewise expose the image carrying surface to form a latent image, and a developing device to develop the latent image to form a toner image on the image carrying surface, wherein the exposing device is composed of a light source to emit a light beam, a deflector to deflect the light beam so as to form a scanning line with the light beam on the image carrying surface, a cylindrical lens provided between the deflector and the image carrying surface and to focus the light beam on the image carrying surface, and an adjusting mechanism to adjust an inclination of the scanning line and to adjust variance in magnification of an image on the scanning line.Type: ApplicationFiled: October 19, 2004Publication date: April 14, 2005Applicant: Konica CorporationInventors: Yuji Okugawa, Naoki Tajima, Masaaki Ikeda, Masahiro Shigetomi
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Publication number: 20030210320Abstract: An image forming apparatus comprises a photoreceptor having an image carrying surface, an exposing device to imagewise expose the image carrying surface to form a latent image, and a developing device to develop the latent image to form a toner image on the image carrying surface, wherein the exposing device is composed of a light source to emit a light beam, a deflector to deflect the light beam so as to form a scanning line with the light beam on the image carrying surface, a cylindrical lens provided between the deflector and the image carrying surface and to focus the light beam on the image carrying surface, and an adjusting mechanism to adjust an inclination of the scanning line and to adjust variance in magnification of an image on the scanning line.Type: ApplicationFiled: June 2, 2003Publication date: November 13, 2003Inventors: Yuji Okugawa, Naoki Tajima, Masaaki Ikeda, Masahiro Shigetomi
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Patent number: 6600504Abstract: An image forming apparatus has a photoreceptor having a image carrying surface, an exposing device to imagewise expose the image carrying surface to form a latent image, and a developing device to develop the latent image to form a toner image on the image carrying surface. The exposing device has a light source which emits a light beam, a deflector which deflects the light beam to form a scanning line with the light beam on the image carrying surface, a cylindrical lens between the deflector and the image carrying surface which focuses the light beam on the image carrying surface, and an adjusting mechanism which adjusts an inclination of the scanning line and adjusts variance in magnification of an image on the scanning line.Type: GrantFiled: September 7, 2001Date of Patent: July 29, 2003Assignee: Konica CorporationInventors: Yuji Okugawa, Naoki Tajima, Masaaki Ikeda, Masahiro Shigetomi
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Publication number: 20020030725Abstract: An image forming apparatus comprises a photoreceptor having an image carrying surface, an exposing device to imagewise expose the image carrying surface to form a latent image, and a developing device to develop the latent image to form a toner image on the image carrying surface, wherein the exposing device is composed of a light source to emit a light beam, a deflector to deflect the light beam so as to form a scanning line with the light beam on the image carrying surface, a cylindrical lens provided between the deflector and the image carrying surface and to focus the light beam on the image carrying surface, and an adjusting mechanism to adjust an inclination of scanning line and to adjust variance in magnification of an image on the scanning line.Type: ApplicationFiled: September 7, 2001Publication date: March 14, 2002Inventors: Yuji Okugawa, Naoki Tajima, Masaaki Ikeda, Masahiro Shigetomi
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Patent number: 6249305Abstract: An image forming apparatus is provided which includes an image carrying member, a plurality of charging devices for charging the image carrying member, a plurality of laser exposing units for scanning the charged image carrying member with laser beams so as to form latent images at a predetermined position on the image carrying member, a plurality of developing devices for developing the latent images so as to form toner images, and a transfer section for transferring the toner images onto a sheet. The plurality of laser exposing units are vertically arranged and fixed to each other as a single body so that each laser beam of the laser exposing units is parallel to another laser beam with a predetermined interval.Type: GrantFiled: May 12, 1998Date of Patent: June 19, 2001Assignee: Konica CorporationInventors: Takayuki Miyamoto, Masaaki Ikeda, Yuji Okugawa, Hajime Tanaka, Naoki Tajima, Masahiro Shigetomi