Having Feedback Or Environmental Control Patents (Class 347/133)
  • Patent number: 10203624
    Abstract: An image forming apparatus include a latent image bearer, charger, latent image forming unit, developing unit, receiver unit, transfer unit, information acquisition unit, and correction unit. The charger charges the latent image bearer with a predetermined charging potential. The latent image forming unit forms an electrostatic latent image on the latent image bearer. The developing unit develops the electrostatic latent image to form a toner image. The receiver unit receives the toner image from the talent image bearer. The transfer unit applies a predetermined transfer bias to transfer the toner image to the receiver unit. The information acquisition unit acquires residual image generation determination information.
    Type: Grant
    Filed: December 30, 2016
    Date of Patent: February 12, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Shotaro Hoshi, Yoshinori Nakagawa, Hiroki Atari
  • Patent number: 10146151
    Abstract: In an optical scanning device, light emitting start timings of light emitting parts with respect to a reference light emitting part are stored in a storage part. In a correction mode, a light emitting timing correction control part performs first control for allowing positions of beam spots of the light beams emitted from the light emitting parts to be equal to each other, second control for allowing a light emitting part LD4 to emit a light beam at a plurality of different start timings and patch images to be formed on a intermediate transfer belt 281, and third control for correcting light emitting start timings of light emitting parts LD2 to LD4 on the basis of the start timing of the light emitting part LD4 at which the patch images has the highest concentration.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: December 4, 2018
    Assignee: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventor: Hideji Mizutani
  • Patent number: 10142504
    Abstract: An image forming apparatus includes a feed tray having a placement surface on which a sheet is placed. The feed tray includes a fixed table, an extension table, and a sensor. The extension table is capable of being pulled out along and being accommodated in the fixed table. The sensor is disposed on the fixed table and detects whether or not the sheet is placed on the extension table in a situation in which the extension table is pulled out.
    Type: Grant
    Filed: August 2, 2017
    Date of Patent: November 27, 2018
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Tuan Anh Quang Ta
  • Patent number: 10091378
    Abstract: An optical scanning device according to an embodiment includes a light source, a MEMS mirror, a MEMS-mirror driving unit, a control unit, and a sensor. The light source radiates a plurality of laser beams that scan a photoconductive drum. The MEMS mirror includes a reflection surface that reflects the plurality of laser beams radiated from the light source. The MEMS-mirror driving unit reciprocatingly moves the MEMS mirror. The sensor supplies a horizontal synchronization signal to the control unit by detecting the laser beam reflected on the reflection surface when the MEMS mirror reaches a predetermined position. After detecting the horizontal synchronization signal supplied from the sensor, the control unit performs the auto power control of the light amount of at least one laser beam among the plurality of laser beams.
    Type: Grant
    Filed: December 16, 2016
    Date of Patent: October 2, 2018
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Sueo Ueno
  • Patent number: 9904205
    Abstract: An image forming apparatus includes a rotating polygon mirror configured to rotate and reflect the first laser beam and the second laser beam, a first generation unit configured to generate a first signal based on timings at which the respective first laser beams, a second generation unit configured to generate a second signal for determining a timing to form an electrostatic latent image on the second image bearing member with the second laser beam based on the first signal and a correction value, and a calculation unit configured to calculate the correction value based on the output of the detection unit, in which the calculation unit calculates the correction value based on the signal output from the detection unit in a period of time that has passed until the rotating polygon mirror reaches steady rotation since it has started to be driven to rotate.
    Type: Grant
    Filed: February 11, 2016
    Date of Patent: February 27, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Norihiro Shirahata
  • Patent number: 9834026
    Abstract: A decoloring apparatus comprises a decoloring unit configured to carry out a decoloring processing which decolors the color of an image formed on a paper with a decolorable color material; a scanner configured to scan the papers to which the decoloring processing is carried out; a memory configured to store data of a predetermined image indicating a predetermined form formed on the paper; a conveyance section configured to convey the paper scanned by the scanner to a plurality of paper discharging positions; and a control section configured to determine whether or not the scan image generated by the scanner is consistent with the predetermined image, and to drive the conveyance section to respectively convey the papers on each of which the scan image is consistent with the predetermined image and the papers on each of which the scan image is not consistent with the predetermined image to different positions.
    Type: Grant
    Filed: May 4, 2017
    Date of Patent: December 5, 2017
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Noriyuki Umezawa
  • Patent number: 9520099
    Abstract: A converter includes a feedback part, a pulse width modulation (PWM) controller and a PWM generator. The feedback part is configured to output a feedback signal based on a driving voltage. The PWM controller is configured to output a PWM control signal based on the feedback signal and a first compensation signal. The PWM generator is configured to control the driving voltage based on the PWM control signal. The first compensation signal is determined according to an occurrence of a predetermined pattern of an input image data.
    Type: Grant
    Filed: December 16, 2014
    Date of Patent: December 13, 2016
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Bum Lee, Dong-In Kim, Yeon-Sun Na, Hyun-Seok Hong
  • Patent number: 9516179
    Abstract: An image capturing unit includes a sensor unit that image-captures a predetermined area including a subject; and a reference chart unit that is arranged in the predetermined area and captured with the subject by the sensor unit.
    Type: Grant
    Filed: November 28, 2012
    Date of Patent: December 6, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Nobuyuki Satoh, Yasuyuki Suzuki, Masato Kobayashi, Suguru Yokozawa, Tatsuhiko Okada, Mamoru Yorimoto, Daisaku Horikawa, Yuichi Sakurada
  • Patent number: 9405212
    Abstract: An object is to accurately determine a factor that drops the quantity of laser light. An image forming apparatus is provided, which has: a laser diode that includes a front side emission point to which drive current is supplied and from which rear light is emitted; a photosensitive drum to which the rear light is emitted; a detection portion that detects a value on a surface potential of the photosensitive drum; and a determination portion that determines an abnormality of the laser diode, and the detection portion detects, a plurality of times, a value on the surface potential of a portion of the photosensitive drum to which the rear light is emitted, and the determination portion determines whether the laser diode is abnormal based on a change amount of the value on the surface potential detected by the detection portion.
    Type: Grant
    Filed: July 6, 2015
    Date of Patent: August 2, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Hidetoshi Hanamoto, Kazutaka Yaguchi
  • Patent number: 9242478
    Abstract: The invention is concerning the writing controlling apparatus that includes an acquiring unit configured to acquire a plurality of light amounts of a light source driven while changing an input current in non-effective scanning periods during which an image carrier is not irradiated with light from the light source, as a plurality of output results; a detecting unit configured to detect characteristics of the light source using the output results thus acquired; and a correcting unit configured to correct a current to be applied to the light source based on the characteristics thus detected.
    Type: Grant
    Filed: December 11, 2013
    Date of Patent: January 26, 2016
    Assignee: RICOH COMPANY, LIMITED
    Inventors: Masashi Suzuki, Katsuhiko Maeda, Yoshio Kanzaki, Masahiko Oikawa, Yasuhiro Abe, Hiroaki Nishina, Yuuki Honda
  • Patent number: 9081361
    Abstract: There is provided an image forming apparatus including: an image forming section including a photosensitive body, and an LED array configured to expose the photosensitive body; and a controller configured to: make a judgment of a dew-condensation state of the LED array, and change a power supply state of the LED array based on the dew-condensation state.
    Type: Grant
    Filed: January 28, 2014
    Date of Patent: July 14, 2015
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Junichi Yokoi
  • Publication number: 20150116438
    Abstract: An image forming apparatus may include a laser scanning unit which irradiates light to a photosensitive body to form an image; a feedback information provision unit which provides feedback information used to control optical power of the laser scanning unit; and a main controller which controls the optical power of the laser scanning unit by adjusting a voltage that is applied to the laser scanning unit by using the feedback information. The main controller performs primary optical power control by comparing a density of a sample patch formed on the photosensitive body by the laser scanning unit, the density received from the feedback information provision unit, with a target density that is previously stored and performs secondary optical power control by comparing a feedback voltage received from the feedback information provision unit with the target voltage obtained during the primary optical power control.
    Type: Application
    Filed: October 7, 2014
    Publication date: April 30, 2015
    Applicant: Samsung Electronics Co., Ltd.
    Inventor: Su-whan KIM
  • Patent number: 8963970
    Abstract: An image forming apparatus improved in the accuracy of detecting a time period over which a laser beam is scanned. A laser beam emitted from a laser light source is deflected by a polygon mirror such that the laser beam scans a photosensitive drum. The deflected laser beam is guided onto the photosensitive drum via an imaging lens. A mode hop detection unit detects a mode hop of the laser beam. An image pulse generation section detects a main scanning magnification of an electrostatic latent image formed on the photosensitive drum. When a mode hop is detected, the main scanning magnification in a next scanning cycle is corrected using a correction value stored in a storage unit and used most lately, whereas when no wavelength variation has not detected, the main scanning magnification in the next scanning cycle is corrected using the latest correction value.
    Type: Grant
    Filed: June 14, 2012
    Date of Patent: February 24, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Noriyuki Chino, Katsuhiko Takano, Masaaki Naoi, Shingo Horita, Takeshi Uchida
  • Patent number: 8957928
    Abstract: An image forming apparatus includes a photoconductor, a charger to charge the photoconductor, a multi-beam scanning unit, a development unit, and a transfer unit. The multi-beam scanning unit includes a vertical cavity surface emitting laser as a light source having light emitting elements arrayed in main and sub-scanning directions by setting an interval between light emitting elements adjacently disposed at a center portion of the scanning unit in the sub-scanning direction narrower than an interval between other light emitting elements adjacently disposed at other portions of the scanning unit in the sub-scanning direction, a deflecting element to deflect light emitted from the light emitting elements to scan the surface of photoconductor by an interlace scan, and a light intensity adjustment unit to adjust light intensity of the light emitting elements adjacently disposed at the center portion relative to a light intensity of other light emitting elements adjacently disposed at other portions.
    Type: Grant
    Filed: May 24, 2011
    Date of Patent: February 17, 2015
    Assignee: Ricoh Company, Ltd.
    Inventor: Tatsuo Ohyama
  • Patent number: 8941701
    Abstract: An image forming apparatus includes a temperature sensor detecting an operating ambient temperature of the polygon motor, and a controller controlling the polygon motor and the paper feed mechanism. If the temperature detected by the temperature sensor is equal to or greater than a preset temperature, the controller controls, before operation for giving a command to start image formation is performed, the polygon motor to rotate; increases, in response to the operation, a rotational speed of the polygon motor up to a rated speed; and controls the paper feed mechanism to start conveying a sheet of paper at a time when a period of time variable depending on the detected temperature has elapsed, the period of time being preset to be shorter as the detected temperature increases, in expectation of a time required for the rotational speed of the polygon motor to reach the rated speed.
    Type: Grant
    Filed: June 22, 2012
    Date of Patent: January 27, 2015
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Takatoshi Hamada, Yohei Yamada, Yasuomi Mitsui
  • Patent number: 8933979
    Abstract: An image forming apparatus comprises a light source, a photosensitive member and a control unit. The light source turns on in response to a driving current supplied based on image data. An electrostatic latent image is formed on the photosensitive member by exposing the photosensitive member to a light beam output from the light source turned on. The control unit controls the value of the driving current supplied to the light source in accordance with a driving state of the light source so that the value of the driving current supplied to the light source differs and changes with the passage of time in accordance with the driving state of the light source prior to the driving current being supplied to the light source.
    Type: Grant
    Filed: November 10, 2011
    Date of Patent: January 13, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yuichi Seki
  • Publication number: 20150002598
    Abstract: An image forming apparatus according to one aspect controls a light source such that first and second laser beams emitted from first and second light emitting elements respectively are incident on a BD sensor successively, and measures the time interval between two BD signals, output from the BD sensor, that correspond to the first and second laser beams and. When performing the measurement, the image forming apparatus controls the light powers of the first and second light beams so as to be light powers determined in advance using APC. According to this, measurement errors when measuring the interval between the light beams emitted from the two light emitting elements are suppressed, and correction accuracy for the image writing start positions for the multiple light emitting elements is improved.
    Type: Application
    Filed: June 18, 2014
    Publication date: January 1, 2015
    Inventor: Yasutomo Furuta
  • Patent number: 8922613
    Abstract: A light beam scanning device which is capable of performing high-accuracy light amount control without complicated control even when the device includes a laser diode having non-linear I-L characteristics. Gain circuits set the amount of light to be emitted from the laser diode. A PD circuit board detects the amount of the emitted light. A laser controller controls the amount of the emitted light by adjusting drive current applied to the laser diode based on a detection output from the PD circuit board. A CPU corrects data for correcting the drive current. The CPU decides a light amount correction range for correcting the light amount based on the correction data, calculates the slope of the I-L characteristics in the light amount correction range based on light amounts at two points within the light amount correction range and drive currents associated with the respective light amounts, and corrects the correction data using the calculated slope.
    Type: Grant
    Filed: April 26, 2013
    Date of Patent: December 30, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Daisuke Akagi
  • Patent number: 8907999
    Abstract: An electrophotographic image forming apparatus that are capable of reducing the variation of the rise time of the laser light source due to the temperature change of the laser light source with a simple configuration. A laser light source emits a laser beam according to a driving signal in order to expose an image bearing member. A voltage detection unit detects terminal voltage of the laser light source. A drive unit has a voltage source that can control output voltage and supplies current corresponding to the output voltage of the voltage source to the laser light source when making the laser light source emit the laser beam according to the driving signal. A control unit controls the voltage source so that the output voltage of the voltage source generates current overshot to a target current based on the detection result of the voltage detection unit.
    Type: Grant
    Filed: January 20, 2012
    Date of Patent: December 9, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Shigeru Kasahara
  • Publication number: 20140300677
    Abstract: A scanning optical apparatus includes a light beam detection unit, a reference signal generation unit, and a returned light detection unit. The light beam detection unit decides whether the light beam reflected by the reflecting surface of a polygon mirror has entered the BD sensor, through comparison between an output value of the BD sensor and a predetermined first threshold. The reference signal generation unit generates a scan start reference signal in response to the decision that the light beam has entered the BD sensor. The returned light detection unit decides whether the light beam reflected by the reflecting surface has entered the internal light sensor, through comparison between an output value of the internal light sensor and a second threshold corresponding to light beam intensity higher than the intensity of the light beam reflected by the reflecting surface and corresponding to the first threshold.
    Type: Application
    Filed: April 1, 2014
    Publication date: October 9, 2014
    Applicant: KYOCERA Document Solutions Inc.
    Inventor: Shingo Yoshida
  • Publication number: 20140267527
    Abstract: An optical writing device for forming an electrostatic latent image on a photoreceptor by exposing the photoreceptor to light modulated in accordance with image data. The optical writing device has: a substrate; a light-emitting-element array including a plurality of light-emitting elements supported by the substrate to be arranged in a main-scanning direction; and a light-receiving-element array substantially in parallel to the light-emitting-element array, the light-receiving-element array including a plurality of light-receiving elements supported by the substrate to be arranged in the main-scanning direction. For light-quantity measurement of one of the light-emitting elements, at least an output value output from one of the light-receiving elements of which center is located in a different position, with respect to the main-scanning direction, from a center of the one of the light-emitting elements is used.
    Type: Application
    Filed: March 11, 2014
    Publication date: September 18, 2014
    Applicant: Konica Minolta, Inc.
    Inventors: Satoshi MASUDA, Yoshikazu WATANABE, Makoto OBAYASHI, Masayuki IIJIMA, So YANO
  • Patent number: 8786646
    Abstract: A light-emitting chip includes: a substrate; plural light-emitting elements arrayed in line on the substrate, each of the light-emitting elements including a light-emitting region having a length in an array direction of the array different from a length in a direction orthogonal to the array direction; and a light-up current supplying interconnection including plural connecting portions, each of the connecting portions being provided on the light-emitting region of a corresponding one of the light-emitting elements in a shorter direction of the light-emitting region either the array direction or the direction orthogonal to the array direction, each of the connecting portions being connected to an electrode provided on the light-emitting region, the light-up current supplying interconnection supplying a current for lighting up to the plural light-emitting elements through the plural connecting portions.
    Type: Grant
    Filed: April 11, 2011
    Date of Patent: July 22, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Taku Kinoshita, Yoshinao Kondoh, Seiji Ohno
  • Patent number: 8659630
    Abstract: An embodiment of the image processing apparatus for controlling the lighting of a line head that is driven with binary data and performs exposure with subline lighting to thereby form images, includes: a subline generating unit that generates a plurality of sublines from a same image data; an inclination correcting unit that exposes the generated sublines so as to generate correction image data used to correct an inclination of an exposure position; a gradation control unit that controls the lighting of sublines based on the correction image data generated by the inclination correcting unit to express gradation; and a light intensity correction unit that corrects and controls the light intensity based on the correction image data generated by the inclination correcting unit, wherein an output of the gradation control unit and an output of the light intensity correction unit are input into the line head in parallel.
    Type: Grant
    Filed: September 12, 2011
    Date of Patent: February 25, 2014
    Assignee: Ricoh Company, Limited
    Inventors: Kunihiro Komai, Izumi Kinoshita, Tatsuya Miyadera, Yoshinori Shirasaki, Takuhei Yokoyama, Takeshi Shikama, Akinori Yamaguchi
  • Patent number: 8537190
    Abstract: An image forming apparatus including: a light scanning portion that lights a plurality of beams, and scans a surface to be scanned of an image carrier to form an electrostatic latent image; a detection portion that detects at least one lighted beam; an abnormality detection portion that transmits data to the light scanning portion via a transmission-line, causes the light scanning portion to light a beam, and detects abnormality of the transmission-line based on the detected beam; and a setting portion that sets a number of beams to be lighted in the case of the formation of the electrostatic latent image so that an amount of light of the detected beam in the case of abnormality detection of the transmission-line is equal to or more than a minimum amount of light of the detected beam in the case of the formation of the electrostatic latent image.
    Type: Grant
    Filed: April 15, 2011
    Date of Patent: September 17, 2013
    Assignee: Fuji Xerox Co., Ltd.
    Inventor: Tomoaki Sakita
  • Patent number: 8305407
    Abstract: There is provided an exposure device including: plural exposure heads having plural light-emitting elements arranged in a first direction, the plurality of exposure heads also being arranged in the first direction; plural temperature detecting units for detecting temperature arranged at both ends in the first direction of each of the plural exposure heads; and a correction unit for correcting quantities of light emitted from the exposure heads based on temperature data detected by the temperature detecting units.
    Type: Grant
    Filed: August 19, 2009
    Date of Patent: November 6, 2012
    Assignee: Fuji Xerox Co., Ltd.
    Inventor: Yoshihiko Taira
  • Patent number: 8199376
    Abstract: An image forming apparatus includes a VCSEL that includes a plurality of light sources emitting light beams, an image processing unit, and write control units that send a sub-scanning start reference signal indicating a reference for starting image formation in a sub-scanning direction and start a control of driving the light sources for each of a plurality of colors when receiving image data from the image processing unit. The write control units perform a control of outputting the sub-scanning start reference signal at timing of any of a plurality of areas divided by the number of lines scanned simultaneously in a scan cycle in a main-scanning direction.
    Type: Grant
    Filed: September 15, 2009
    Date of Patent: June 12, 2012
    Assignee: Ricoh Company, Limited
    Inventor: Toshio Ohide
  • Patent number: 8184320
    Abstract: A printing control apparatus to control a printing operation includes a web server connection unit to connect with a web server of a pre-set address and receive environmental information of an area where the printing apparatus is located, and a controller to transmit a printing control signal corresponding to the received environmental information and printing data to a printing apparatus. Accordingly, a transfer voltage is adjusted according to the environmental information of the area where the printing apparatus is located, so that the effect of the environment on the printing quality can be minimized and thus the printing quality can be improved.
    Type: Grant
    Filed: March 12, 2008
    Date of Patent: May 22, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Don-seon Lee
  • Patent number: 8125503
    Abstract: An image forming apparatus is provided. The image forming apparatus includes a semiconductor laser that emits a laser beam, a light power of the laser beam being controllable by a current applied to the semiconductor laser; a scanner unit that exposes a photosensitive element by scanning the photosensitive element using the laser beam; a light power detection unit that detects a light power of the laser beam; a current control unit that controls the current applied to the laser based on the light power of the laser beam; a home position detection unit that detects whether the laser beam is positioned at a scan home position; and a continuous illumination unit that commences continuous illumination of the laser at a time which is prior to a forecast time at which the home position detection unit is forecast to detect the laser beam.
    Type: Grant
    Filed: December 5, 2008
    Date of Patent: February 28, 2012
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Tasuku Sugimoto
  • Patent number: 8096634
    Abstract: A method and system for compensating for temperature changes is disclosed that includes a mounting bar, a plurality of imaging chips adaptively mounted on the mounting bar, each imaging chip including a plurality of imaging elements, and a temperature determiner to determine a temperature of the mounting bar. A control module enables and disables at least one imaging element based on the determined temperature of the mounting bar.
    Type: Grant
    Filed: September 17, 2007
    Date of Patent: January 17, 2012
    Assignee: Xerox Corporation
    Inventor: Douglas Wiggins
  • Patent number: 8094178
    Abstract: In an image forming apparatus, a separating unit separates each laser beam into a first laser beam used for measuring light intensity and a second laser beam used for scanning a photosensitive element, a photoelectric converting unit measures a light intensity of each of the first laser beams and outputs a voltage indicative of the light intensity. A control unit controls a light intensity of each of the laser beams based on a common drive current and a corresponding one of a current correction value, which is set by each of the laser beams to correct a light intensity of a corresponding one of the laser beams based on a corresponding one of the voltages output by the photoelectric converting unit.
    Type: Grant
    Filed: May 22, 2008
    Date of Patent: January 10, 2012
    Assignee: Ricoh Company, Ltd.
    Inventor: Hidetoshi Yamashita
  • Patent number: 8089665
    Abstract: An optical scanning device includes n-odd (n?2) light sources disposed at different positions at least in a sub-scanning direction, a pixel forming part in which one pixel is depicted by light beams emitted from m-odd (n?m?2) light sources of the n-odd light sources and a distance of adjacent light sources for emitting the light beams in the sub-scanning direction is less than 5 ?m, and a light source driving control part configured to control an emitting state of the light sources for depicting the one pixel and conduct an emission driving control for moving a gravity center of the one pixel in the sub-scanning direction.
    Type: Grant
    Filed: October 26, 2007
    Date of Patent: January 3, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Atsufumi Omori, Masaaki Ishida, Yasuhiro Nihei, Jun Tanabe
  • Patent number: 8081200
    Abstract: Emission windows are prevented from being contaminated and are cleaned easily. The emission windows for emitting light beams are disposed on a housing of a laser exposure device having optical elements arranged inside for exposing a photoreceptor, and the upper surface of the housing is provided with a slidable shutter with openings. An image forming apparatus includes guide rails independent of the laser exposure device to movably guide predetermined cleaning brushes in the longitudinal direction of the emission windows. When the cleaning brushes are mounted on the guide rails and moved toward the inner side of the apparatus, the cleaning brushes touch a slant portion of a rib and the shutter is moved to the right to align the openings with the emission windows. While the cleaning brushes touch a longitudinally extending portion, the emission windows are exposed to enable the cleaning of the exposed window using the cleaning tool.
    Type: Grant
    Filed: December 15, 2008
    Date of Patent: December 20, 2011
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yoshihisa Yamada, Nobuhiro Shirai
  • Patent number: 8035669
    Abstract: According to an aspect of the invention, a control method for an exposure shutter of an image forming apparatus includes, opening the shutter only to a slit glass for monochrome when monochrome printing is performed, and opening the shutter to slit glasses for monochrome and color when color printing is performed.
    Type: Grant
    Filed: September 9, 2008
    Date of Patent: October 11, 2011
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Tec Kabushiki Kaisha
    Inventor: Takaji Nakamura
  • Patent number: 7728862
    Abstract: An optical scanning apparatus includes a plurality of light sources capable of emitting light. A detection unit detects a light quantity of the light emitted from the plurality of light sources. A control unit controls drive current of a light source designated as a control object based on a detection result obtained by the detection unit. The control unit controls the drive current based on an activation state of the light source designated as the control object and an activation state of a light source other than the control object.
    Type: Grant
    Filed: May 25, 2007
    Date of Patent: June 1, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventor: Junichi Kishimoto
  • Patent number: 7672345
    Abstract: A drive signal for driving a semiconductor laser is generated on the basis of an image signal inputted in synchronism with a pixel clock. A bias signal to the semiconductor laser is generated at a timing earlier than the drive signal by a predetermined time. The bias signal is disabled in synchronism with the leading edge of the drive signal.
    Type: Grant
    Filed: January 20, 2009
    Date of Patent: March 2, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tsuyoshi Moriyama
  • Patent number: 7642535
    Abstract: A light emitting device includes: a plurality of light emitting elements that emit light to have luminosity depending on the magnitude of a driving signal; a plurality of holding units that are respectively disposed in the plurality of light emitting elements, and respectively hold the driving signal to maintain a magnitude regulated such that the luminosity of the plurality of light emitting elements becomes uniform; and a plurality of supply units that are respectively disposed in the plurality of light emitting elements, and supply the driving signal, which is held by the holding units to have a certain magnitude for a period of time according to a gradation of light to be emitted, to a corresponding light emitting element.
    Type: Grant
    Filed: December 19, 2008
    Date of Patent: January 5, 2010
    Assignee: Seiko Epson Corporation
    Inventor: Akira Nakajima
  • Patent number: 7564472
    Abstract: In an optical control apparatus, a semiconductor laser emits a laser beam having a power corresponding to an energizing current. A light power detecting device detects a light power of the laser beam. A monitor voltage generating device generates a monitor voltage set based on the light power. A reference voltage generating device generates a reference voltage set based on a target light power of the laser beam. A current control device controls the energizing current such that the monitor voltage approaches the reference voltage based on a deviation of the monitor voltage from the reference voltage. A pseudo voltage input device inputs a predetermined pseudo voltage to the current control device instead of the monitor voltage under a predetermined condition such that a variation range of the deviation lies within a predetermined range.
    Type: Grant
    Filed: February 22, 2007
    Date of Patent: July 21, 2009
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Isao Kubo
  • Patent number: 7512349
    Abstract: An image forming apparatus includes an electrophotographic photoconductive body for forming an electrostatic latent image thereon; an exposure device for exposing the electrophotographic photoconductive body to form an electrostatic latent image; a storage device for storing information related to potential characteristics at a plurality of areas divided on a surface of the electrophotographic photoconductive body in advance; an information obtaining device for obtaining the information related to potential characteristics, wherein light quantities exposed by the exposure device are determined according to the information related to potential characteristics stored by the storage device and the information related to potential characteristics obtained by the information obtaining device.
    Type: Grant
    Filed: July 24, 2006
    Date of Patent: March 31, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventors: Isami Itoh, Tetsuya Atsumi, Masatsugu Toyonori, Tomohito Ishida
  • Patent number: 7485886
    Abstract: A light emitting device includes: a plurality of light emitting elements that emit light to have luminosity depending on the magnitude of a driving signal; a plurality of holding units that are respectively disposed in the plurality of light emitting elements, and respectively hold the driving signal to maintain a magnitude regulated such that the luminosity of the plurality of light emitting elements becomes uniform; and a plurality of supply units that are respectively disposed in the plurality of light emitting elements, and supply the driving signal, which is held by the holding units to have a certain magnitude for a period of time according to a gradation of light to be emitted, to a corresponding light emitting element.
    Type: Grant
    Filed: August 25, 2006
    Date of Patent: February 3, 2009
    Assignee: Seiko Epson Corporation
    Inventor: Akira Nakajima
  • Patent number: 7460141
    Abstract: An imaging apparatus for imaging on a recording medium is improved to permit the imaging power to be balanced between various groups of individual radiation sources with a low outlay and high accuracy. Two or more imaging heads that respectively include a multiplicity of individual radiation sources that can be electrically driven individually with light beams directed onto a radiation-sensitive layer of the recording medium. A drive moves the recording medium and the radiation sources relative to one another. A control device controls the power of the light beams of the radiation sources separately for each imaging head. A least one light guide is provided that guides a portion of the light beams emanating from the radiation sources to the receiver surface of a photoelectric sensor, which sensor is connected to the control device.
    Type: Grant
    Filed: October 21, 2005
    Date of Patent: December 2, 2008
    Assignee: Heidelberger Druckmaschinen AG
    Inventors: Andreas Detmers, Christian Meier, Ingo Ringle, Thomas Rupp, Wolfgang Theiss
  • Patent number: 7317467
    Abstract: A control system for a cooling fan of a laser printer enables selection of fan speed based on the actual degree of usage of the printer. The system provides first and second sets of fan speeds where each set contains information corresponding to a plurality of fan speeds. Information regarding the current operational condition of the fuser of the printer is periodically obtained, preferably during a preset interval. The fan is then operated at one of the fan speeds of the first or second set of fan speeds, with the selection of the first or second set and the selection of one of the fan speeds based on the current operational condition of the fuser. In this manner, the speed of the fan is substantially continuously controlled based on the operational condition of the printer.
    Type: Grant
    Filed: October 19, 2004
    Date of Patent: January 8, 2008
    Assignee: Lexmark International, Inc.
    Inventors: Benjamin Kyle Shepherd, Kevin Dean Schoedinger, Phil Wright
  • Patent number: 7306313
    Abstract: A plurality of first base images are formed from a base color output in accordance with a predetermined adjustment value. A plurality of first correction images are formed on the first base images from a correction color to be a subject for correction output in accordance with a predetermined adjustment value. The first correction images are displaced within a predetermined range. The first adjustment value is determined from changed adjustment values. The second base images are formed from the base color output in accordance with the predetermined adjustment value, and the second correction images are formed from the correction color output in accordance with a plurality of adjustment values determined based on the first adjustment value. The second adjustment value having an extreme is determined from a plurality of adjustment value candidates. Finally, the adjustment value for the correction color is corrected to the determined second adjustment value.
    Type: Grant
    Filed: July 23, 2003
    Date of Patent: December 11, 2007
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Eiji Kamimura, Yoshikazu Harada, Kyosuke Taka, Nobuo Manabe, Toshio Yamanaka, Norio Tomita, Manabu Matsumoto
  • Publication number: 20070236553
    Abstract: To provide an image forming apparatus capable of preventing a fluctuation in image density immediately after the light quantities are corrected, and a method for controlling the same, when light quantity measurement is carried out at time t1, the controller CPU calculates the light quantity correction value ND. Herein, it is assumed that the light quantity correction value ND calculated previously, which is the light quantity correction value before light quantity measurement at time t1, is NDold, and the light quantity correction value ND calculated based on the light quantity measurement value at time t1 is NDnew. When the light quantity correction NDnew is calculated, the controller CPU varies the light quantity correction value ND from the light quantity correction value NDold a plurality of times by a predetermined variation value ? in the direction approaching the light quantity correction value NDnew for each of the printing sheets.
    Type: Application
    Filed: April 9, 2007
    Publication date: October 11, 2007
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Yuuzou KAWANO, Kouhei SUYAMA, Kazuo NISHIMURA
  • Patent number: 7279667
    Abstract: An image forming apparatus includes an exposure unit, a developing unit and a transferring unit that transfers a visualized image of developer to an image recording medium. The exposure unit includes a light emitting unit, a detecting unit that detects a quantity of light, a reference voltage generating portion that generates a reference voltage set in accordance with a targeted value of the quantity of light, an emitted-light quantity control circuit that controls the quantity of light emitted from the light emitting unit so that a detection voltage becomes equal to a value of the reference voltage, and a reference voltage control portion that controls the reference voltage generating portion so as to change the reference voltage at a predetermined rate in stages. A new reference voltage is based on a density of the image of the developer obtained after being changed when the density is changed.
    Type: Grant
    Filed: March 24, 2006
    Date of Patent: October 9, 2007
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Isao Kubo
  • Publication number: 20070188584
    Abstract: An image forming apparatus includes a photoconductor 8 which bears an image to be formed by exposure, a light emission part 600 which emits light for exposing the photoconductor 8 to the light, and a light quantity measuring part 700 which measures the quantity of the light emitted from the light emission part 600 and outputs a light quantity measuring signal. The light quantity measuring signal of the light quantity measuring part 700 is sent through an engine control part 42 to a controller 41, and the quantity of the light emitted from the light emission part 600 is controlled so that the light quantity measuring signal becomes a predetermined value. Here, a sign indicating inclination (change rate) of the light quantity measuring signal of the light quantity measuring part 700 for temperature is matched with a sign indicating inclination (change rate) of sensitivity of the photoconductor 8 for temperature.
    Type: Application
    Filed: February 9, 2007
    Publication date: August 16, 2007
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Tetsurou Nakamura, Kei Sakanoue, Yuuji Toyomura, Ryuuichi Yatsunami, Takafumi Hamano, Naoto Matsuo, Shinya Yamamoto
  • Patent number: 7221464
    Abstract: The invention concerns an image recording apparatus suitable for forming a medical image that is used for a medical diagnosis, and a test pattern for evaluating a quality of the medical image. The image recording apparatus includes a printing section to either the medical image or the test pattern on the recording medium, based on image date; a printing-condition setting section to set a printing condition for printing the test pattern; and a printing-condition displaying section to display the printing condition set by the printing-condition setting section. The printing section prints at least one of a sharpness-evaluating pattern and a granularity-evaluating pattern.
    Type: Grant
    Filed: November 29, 2001
    Date of Patent: May 22, 2007
    Assignee: Konica Corporation
    Inventor: Akira Yamano
  • Patent number: 7170536
    Abstract: A beam detection sensor detects power of a laser beam from one of a plurality of light sources for each scanning of a scanning section to provide a light power signal. A laser control circuit compares a value of the light power signal with a predetermined value, adjusts a terminal voltage of a capacitor based on a result of the comparison, controls emission power of one of the light sources in accordance with the terminal voltage of the capacitor, and executes the control once for each light source during a plurality of scanning operations. An APC correction circuit corrects a reduction in the power of a laser beam in accordance with a reduction in electric charges applied to the capacitor caused by a leakage current during the plurality of scanning operations.
    Type: Grant
    Filed: September 3, 2004
    Date of Patent: January 30, 2007
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Tec Kabushiki Kaisha
    Inventors: Yuji Inagawa, Koji Tanimoto, Kenichi Komiya, Daisuke Ishikawa
  • Patent number: 7154517
    Abstract: This invention provides an image forming apparatus that can suppress variations in writing densities of LED heads and form stable images. An image forming apparatus has an image retainer 1 for retaining a toner image, an image writing unit 3 equipped with a plurality of LED heads 31 to form a static latent image the image retainer 1, a developing unit 4 for developing the static latent image formed by the image writing unit 3 with a developing agent, a patch formation controller 23 for forming patches for each LED head on the image retainer 1, a density detector 25 for detecting the density of each patch formed by the patch formation controller 23, and a correction controller 26 for correcting the light amount of each LED head by the density detected by the density detector 25.
    Type: Grant
    Filed: July 15, 2004
    Date of Patent: December 26, 2006
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Shinpei Kawasaki, Tadashi Matsudaira, Hiroshi Oyama, Katsunori Takahashi, Masayuki Watanabe
  • Patent number: 7119825
    Abstract: An electro-optical system for adjusting beam to beam power non-uniformity in a multi-beam scanning system is disclosed. The electro-optical system consists of N×M array of light beams and N×M array of photodetectors wherein optical means deflect the light beams onto a photodetector array. A circuit consisting of N×M array of programmable laser drivers programmed with uniformity values for each light beam and having an N×M array of feedback loops is used to adjust the power intensity of each beam through the programmable laser drivers wherein each programmable laser driver uses the photodetector array summed with non-linearity inputs to adjust for beam to beam power uniformity correction.
    Type: Grant
    Filed: January 21, 2004
    Date of Patent: October 10, 2006
    Assignee: Xerox Corporation
    Inventor: Shahriar Vazan
  • Patent number: 6989849
    Abstract: An exposure head is provided in which light beams from light emitting parts 63 pass through a transparent substrate 62 and are projected on an image carrier. The transparent substrate 62 has plain faces substantially parallel to each other, one of the faces being a face on which the light emitting parts 63 are formed and the other being a face from which light beams are projected. The transparent substrate 62 is provided, at position(s) other than the face on which the light emitting parts 63 are formed and than the face from which light beams are projected, with light quantity detecting means 100 for detecting the quantity of light emitted from said light emitting parts 63.
    Type: Grant
    Filed: August 11, 2003
    Date of Patent: January 24, 2006
    Assignee: Seiko Epson Corporation
    Inventors: Yujiro Nomura, Atsunori Kitazawa, Kiyoshi Tsujino