Patents by Inventor Isao Nakajima
Isao Nakajima 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: 7747209Abstract: A printing apparatus including a first component having a photosensitive member and a transcribing portion transcribing a toner image formed on the photosensitive member onto a web, and a second component having a web guide portion guiding the web transported to the transcribing portion and a fixing portion fixing the toner image transcribed onto the web, the first component and the second component being able to be connected/divided, the first component is provided with a transcribing portion base supporting the transcribing portion, the second component is provided with a web guide portion base arranged at a position opposed to the transcribing portion base supporting the web guide portion, and an adjusting member for restricting a position of the second component relative to the first component is provided between the transcribing portion base and the web guide portion base.Type: GrantFiled: January 3, 2006Date of Patent: June 29, 2010Assignee: Ricoh Company, Ltd.Inventors: Akihiko Yamazaki, Isao Nakajima, Sho Sawahata
-
Patent number: 7539453Abstract: To provide a printer capable of minimizing the effect of a wrapping member, which is used for wrapping a recording form around a photoconductor, on image quality and realizing high image quality printing, a conveying roller 6, wrapping roller 8, and transfer units 36a and 36b are arranged so that a line La connecting a center Ca of a roller 38a and a transfer point Ta and a line Lb connecting a center Cb of a roller 38b and a transfer point Tb are inclined to a central line A-A and are almost symmetric to the central line A-A. When the wrapping width W of the form around belt photoconductors 32a and 32b is specified to 5 mm?W?25 mm, even when a wrapping roller is not arranged between printing units 30a and 30b, a fixed wrapping width of the form S around the belt photoconductors 32a and 32b is reserved.Type: GrantFiled: April 18, 2005Date of Patent: May 26, 2009Assignee: Ricoh Company, Ltd.Inventors: Yukio Otome, Isao Nakajima, Sho Sawahata, Akihiko Yamazaki, Yukinori Sakuma
-
Publication number: 20080317486Abstract: An image forming apparatus for performing an image forming operation is disclosed that includes an image carrier on which a toner image is formed, an intermediate transfer member configured to transfer the toner image to a recording medium, the intermediate transfer member having a toner image forming area including an output image forming area and a non-output image forming area located outside of the output image forming area, the toner image forming area being wider than the output image forming area, and a detecting part configured to measure a physical quantity regarding an image quality of a first reference image formed in the output image forming area and a second reference image formed in the non-output image forming area.Type: ApplicationFiled: June 13, 2008Publication date: December 25, 2008Inventors: Susumu MONMA, Shinya KOBAYASHI, Shinichi AKATSU, Teruaki MITSUYA, Makoto YAGAWARA, Hideharu MIKI, Isao NAKAJIMA
-
Patent number: 7450883Abstract: A film loading method of an image forming apparatus, includes: loading an endless film which was stored in a container box, using at least two support members, to a film frame of the image forming apparatus, wherein the film is supported by the support members in a different form with respect to a condition of the film when loaded and fitted to the film frame. The support members are initially stored in the container box and serve as a packaging member for use in transporting and storing the film. The support members are attached to respective portions of the film frame and guide the film to be loaded and fitted onto the film frame. The film frame includes holding rollers, and the support members are attached to the respective portions of the film frame, coaxially with the holding rollers.Type: GrantFiled: December 27, 2007Date of Patent: November 11, 2008Assignee: Ricoh Printing Systems, Ltd.Inventors: Akira Asaoka, Shuho Yokokawa, Isao Nakajima, Akihiko Yamazaki
-
Publication number: 20080118269Abstract: A film loading method of an image forming apparatus, includes: loading an endless film which was stored in a container box, using at least two support members, to a film frame of the image forming apparatus, wherein the film is supported by the support members in a different form with respect to a condition of the film when loaded and fitted to the film frame. The support members are initially stored in the container box and serve as a packaging member for use in transporting and storing the film. The support members are attached to respective portions of the film frame and guide the film to be loaded and fitted onto the film frame. The film frame includes holding rollers, and the support members are attached to the respective portions of the film frame, coaxially with the holding rollers.Type: ApplicationFiled: December 27, 2007Publication date: May 22, 2008Applicant: Ricoh Printing Systems, Ltd.Inventors: Akira Asaoka, Shuho Yokokawa, Isao Nakajima, Akihiko Yamazaki
-
Patent number: 7336917Abstract: A film loader for the image forming apparatus has a film formed endlessly and a film frame for holding the film, wherein a guide member for attaching or detaching the film with respect to the film loading portion of the film frame is formed by a packaging member for use in transporting and storing the film.Type: GrantFiled: May 30, 2003Date of Patent: February 26, 2008Assignee: Ricoh Printing Systems, Ltd.Inventors: Akira Asaoka, Shuho Yokokawa, Isao Nakajima, Akihiko Yamazaki
-
Publication number: 20080044192Abstract: According to one embodiment, an image forming apparatus includes an image carrier, a image forming unit, a measurement unit and a controller. The image carrier includes a central region on which a target image as an object of an image forming is formed and a peripheral region placed outward of the central region. The image forming unit forms a reference image on the peripheral region and the central region, before the image forming is started. Also, the image forming unit forms the target image on the central region based on a preset condition and a third reference image on the peripheral region, during the image forming. The measurement unit measures a physical quantity for the reference images.Type: ApplicationFiled: May 31, 2007Publication date: February 21, 2008Applicant: RICOH PRINTING SYSTEMS, LTD.Inventors: Makoto Yagawara, Hideharu Miki, Isao Nakajima, Akihiko Yamazaki, Akira Asaoka, Yukio Otome, Souichi Nakazawa
-
Patent number: 7308220Abstract: A belt unit of an electrophotographic printing apparatus, includes: two rollers for supporting a belt so as to be substantially in parallel with each other; two frames for supporting the rollers and attached to opposite ends of one of the rollers respectively so as to be perpendicular to the rollers; two support members attached to opposite ends of the other roller so as to be perpendicular to the rollers; two elastic members interposed between the two support members and the two frames respectively; and a belt mounting guide provided between the two frames. The belt mounting guide includes a rotating shaft disposed in parallel with the rollers, and an edge portion inclined relative to an axial direction of the rotating shaft.Type: GrantFiled: February 20, 2004Date of Patent: December 11, 2007Assignee: Ricoh Printing Systems, Ltd.Inventors: Akira Asaoka, Isao Nakajima, Akihiko Yamazaki
-
Patent number: 7295794Abstract: A film loader for the image forming apparatus has a film formed endlessly and a film frame for holding the film, wherein a guide member for attaching or detaching the film with respect to the film loading portion of the film frame is formed by a packaging member for use in transporting and storing the film.Type: GrantFiled: May 10, 2006Date of Patent: November 13, 2007Assignee: Ricoh Printing Systems, Ltd.Inventors: Akira Asaoka, Shuho Yokokawa, Isao Nakajima, Akihiko Yamazaki
-
Publication number: 20070212086Abstract: An image forming apparatus is disclosed that is able to form a full color image with high precision by correcting the adhesion quantity of an image visualizing agent and a position shift of a visible image while continuing to perform a printing process. The image forming apparatus includes an intermediate transfer unit; plural photoconductors; plural charging units; plural exposure units; plural developing units; plural first transferring units; and plural second transferring units. The intermediate transfer unit has a correction pattern image formed in a region outside of a predetermined maximum document region of the intermediate transfer unit in a direction perpendicular to the moving direction. A detector is provided in the intermediate transfer unit for detecting the correction pattern image.Type: ApplicationFiled: March 5, 2007Publication date: September 13, 2007Inventors: Makoto YAGAWARA, Hideharu MIKI, Souichi NAKAZAWA, Shinichi AKATSU, Akira ASAOKA, Akihiko YAMAZAKI, Isao NAKAJIMA
-
Publication number: 20060204278Abstract: A film loader for the image forming apparatus has a film formed endlessly and a film frame for holding the film, wherein a guide member for attaching or detaching the film with respect to the film loading portion of the film frame is formed by a packaging member for use in transporting and storing the film.Type: ApplicationFiled: May 10, 2006Publication date: September 14, 2006Applicant: Ricoh Printing Systems, Ltd.Inventors: Akira Asaoka, Shuho Yokokawa, Isao Nakajima, Akihiko Yamazaki
-
Publication number: 20060188304Abstract: A printing apparatus including a first component having a photosensitive member and a transcribing portion transcribing a toner image formed on the photosensitive member onto a web, and a second component having a web guide portion guiding the web transported to the transcribing portion and a fixing portion fixing the toner image transcribed onto the web, the first component and the second component being able to be connected/divided, the first component is provided with a transcribing portion base supporting the transcribing portion, the second component is provided with a web guide portion base arranged at a position opposed to the transcribing portion base supporting the web guide portion, and an adjusting member for restricting a position of the second component relative to the first component is provided between the transcribing portion base and the web guide portion base.Type: ApplicationFiled: January 3, 2006Publication date: August 24, 2006Applicant: Ricoh Printing Systems, Ltd.Inventors: Akihiko Yamazaki, Isao Nakajima, Sho Sawahata
-
Publication number: 20050232670Abstract: To provide a printer capable of minimizing the effect of a wrapping member, which is used for wrapping a recording form around a photoconductor, on image quality and realizing high image quality printing, a conveying roller 6, wrapping roller 8, and transfer units 36a and 36b are arranged so that a line La connecting a center Ca of a roller 38a and a transfer point Ta and a line Lb connecting a center Cb of a roller 38b and a transfer point Tb are inclined to a central line A-A and are almost symmetric to the central line A-A. When the wrapping width W of the form around belt photoconductors 32a and 32b is specified to 5 mm?W?25 mm, even when a wrapping roller is not arranged between printing units 30a and 30b, a fixed wrapping width of the form S around the belt photoconductors 32a and 32b is reserved.Type: ApplicationFiled: April 18, 2005Publication date: October 20, 2005Inventors: Yukio Otome, Isao Nakajima, Sho Sawahata, Akihiko Yamazaki, Yukinori Sakuma
-
Patent number: 6947698Abstract: A fixing apparatus employs a dimethylsilicone oil as a base oil. Two kinds of the oils including amino group as a functional group are mixed to use as a lubricant, thereby enabling the surface of a heating roller to exhibit the most excellent releasing property with respect to a toner as well as realize low running cost.Type: GrantFiled: December 4, 2003Date of Patent: September 20, 2005Assignee: Ricoh Printing Systems, Ltd.Inventors: Sho Sawahata, Shuho Yokokawa, Isao Nakajima, Tsukasa Onose, Ken Onodera, Yasuhide Nakazawa
-
Patent number: 6947617Abstract: A polarized wave scrambler and an optical signal transmission apparatus in which polarization mode dispersion is suppressed, and which has first and second polarization maintaining optical fibers, wherein respective constant components of a phase difference characteristic for optical frequencies between high-speed and low-speed axes of the first and the second polarization maintaining optical fibers are equal, and respective slopes for optical frequencies of the phase difference characteristics of the first and second polarization maintaining optical fibers are different. A plane of polarization of the linearly polarized optical signal is set to an angle between the high-speed axis and the low-speed axis of the first polarization maintaining optical fiber and the linearly polarized optical signal is supplied to the first polarization maintaining optical fiber.Type: GrantFiled: November 12, 2002Date of Patent: September 20, 2005Assignee: Fujitsu LimitedInventor: Isao Nakajima
-
Patent number: 6927875Abstract: In a printing system including first image forming means (A) for forming a first image on a recording medium (7) based on first image information, fixing means (13, 14 and 15) for subjecting the recording medium bearing the first image thereon to at least heating operation so as to fix the first image onto the recording medium, and second image forming means (B) for forming a second image on the recording medium, which has passed through the fixing means, based on second image information, there is provided correcting means for correcting the second image information based on a quantity of heat shrinkage of the recording medium generated by the heating operation in the fixing means.Type: GrantFiled: March 9, 2001Date of Patent: August 9, 2005Assignee: Hitachi Koki Co., Ltd.Inventors: Hiroshi Ueno, Shuho Yokokawa, Isao Nakajima
-
Patent number: 6882819Abstract: An image forming apparatus, having imaging units arranged alternately on both sides of a continuous paper web, is characterized by minimized image misregistration and reduced processing cost. In order to prevent possible color misregistration caused by changes in paper feed path length resulting from the eccentricity of each drive roller, the difference in the eccentric phases of the rollers on the front and back surfaces is controlled, thereby minimizing the difference in changes in paper feed path length.Type: GrantFiled: August 27, 2002Date of Patent: April 19, 2005Assignees: Hitachi, Ltd., Hitachi Printing Solutions, Ltd.Inventors: Masahiro Yagi, Kazutaka Sato, Kenji Asuwa, Isao Nakajima
-
Patent number: 6847788Abstract: In a WDM optical communication system, at least one optical tunable filter is placed along an optical fiber provided as an optical transmission path between a transmitting station and a receiving station. The optical tunable filter has a controllable transmission factor versus wavelength characteristic. In the receiving station, the transmission characteristics (for example, optical signal to noise ratios and Q factors) for optical signals of different wavelengths propagated over the optical fiber are measured. The measurements are sent to the transmitting station. The transmitting station then properly controls both the amounts of pre-emphasis in the transmitting station and the wavelength characteristic of the optical filter on the basis of the measurements to thereby equalize the transmission characteristics for the optical signals.Type: GrantFiled: December 28, 2000Date of Patent: January 25, 2005Assignee: Fujitsu LimitedInventors: Isao Nakajima, Shin-ichirou Harasawa
-
Patent number: 6807245Abstract: There is provided a PLO device which performs high-accuracy, high-quality clock recovery. A shifted data generation part generates shifted data, and a first phase comparison part outputs first difference data. A first filter removes an alternating-current component from the first difference data and outputs a first detection voltage. A delay part delays input data for a time corresponding to half of one time slot with the use of an analog delay element and outputs delayed data. A second phase comparison part compares the phases of the input data and delayed data with each other and outputs second difference data. A second filter removes an alternating-current component from the second difference data and outputs a second detection voltage. An arithmetic section divides the first detection voltage by the second detection voltage to obtain a control voltage. A clock oscillation section outputs recovered clock based on the control voltage.Type: GrantFiled: August 5, 2002Date of Patent: October 19, 2004Assignee: Fujitsu LimitedInventors: Sadao Ibukuro, Setsuo Misaizu, Isao Nakajima
-
Publication number: 20040165909Abstract: A belt unit of an electrophotographic printing apparatus, includes: two rollers for supporting a belt so as to be substantially in parallel with each other; two frames for supporting the rollers and attached to opposite ends of one of the rollers respectively so as to be perpendicular to the rollers; two support members attached to opposite ends of the other roller so as to be perpendicular to the rollers; two elastic members interposed between the two support members and the two frames respectively; and a belt mounting guide provided between the two frames. The belt mounting guide includes a rotating shaft disposed in parallel with the rollers, and an edge portion inclined relative to an axial direction of the rotating shaft.Type: ApplicationFiled: February 20, 2004Publication date: August 26, 2004Applicant: Hitachi Printing Solutions, Ltd.Inventors: Akira Asaoka, Isao Nakajima, Akihiko Yamazaki