Driving Circuitry Patents (Class 347/237)
  • Patent number: 10557596
    Abstract: A light emitting device of an embodiment includes a body including a black epoxy molding compound (EMC) including carbon black; first and second lead frames electrically separated from each other by the body; a light emitting device disposed above at least one of the first or second lead frame; and a molding member disposed above the body and the first and second lead frames so as to surround the light emitting device.
    Type: Grant
    Filed: February 10, 2017
    Date of Patent: February 11, 2020
    Assignee: LG INNOTEK CO., LTD.
    Inventors: Dong Won Lee, Sung Ho Park, Min Kyu Lee
  • Patent number: 10417986
    Abstract: A data driving system of a liquid crystal display panel includes a timing control chip; a plurality of data driving chips; a plurality of first signal lines, which is used to transmit a predetermined data signal from the timing control chip to the plurality of data driving chips, each first signal line being provided between the timing control chip and one of the plurality of data driving chips in order to transmit the predetermined data signal from the timing control chip to the plurality of data driving chips; and a plurality of first transmission gates, each of which is provided on one of the plurality of first signal lines. The data driving system can significantly improve the quality of the received signal of the data driving chip, and can effectively avoid the error of the received signal.
    Type: Grant
    Filed: July 21, 2016
    Date of Patent: September 17, 2019
    Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd
    Inventor: Zhi Xiong
  • Patent number: 10238275
    Abstract: A light source driving apparatus according to an embodiment of the present technology includes a reception unit, an output unit, a sample unit, and a timing output unit. The reception unit receives a pulse modulation signal for pulse-driving a light source. The output unit outputs a delay modulation signal obtained by delaying the received pulse modulation signal to the light source. The sample unit samples, at a predetermined timing, a light amount of the light source driven on the basis of the delay modulation signal. The timing output unit outputs, to the sample unit, a pulse fall timing of the received pulse modulation signal as the predetermined timing.
    Type: Grant
    Filed: March 7, 2016
    Date of Patent: March 26, 2019
    Assignee: SONY CORPORATION
    Inventor: Zenya Nagashima
  • Patent number: 10210795
    Abstract: An LED display module is disclosed. The LED display module includes a substrate; a plurality of multi-pixel packages arrayed in a matrix with rows and columns, respectively, each of the multi-pixel packages including a package substrate and two or more pixels located on the package substrate and each of the pixels including a red LED chip, a green LED chip, and a blue LED chip; and a driver IC adapted to independently control the pixels of the multi-pixel packages. Anode terminals of the LED chips in the pixels adjacent in the row direction are connected in common to one another such that the pixels are scanned in rows in response to scan signals.
    Type: Grant
    Filed: November 15, 2017
    Date of Patent: February 19, 2019
    Assignee: LUMENS CO., LTD.
    Inventors: Jinmo Kim, Keunoh Kim, Junhyung Lim, Huikyeong Noh, Seongbok Yoon, Jinwon Choi, Jimin Her, Younghwan Shin, Kyujin Lee, Sol Han
  • Patent number: 10105963
    Abstract: A method for printing includes analyzing print quality requirements for a printing area; adjusting settings for heater elements (e.g., energy and/or firing durations) of strobe lines based on the requirements analysis; and providing a plurality of individual strobe signals to the strobe lines. The strobe signals can be transmitted simultaneously, for example with a field-programmable gate array. Analyzing print quality requirements can include separating the printing area into one or more areas of interest, such as rows and/or columns. For each area of interest individual print quality settings (e.g., darkness, contrast, and/or media sensitivity) may be selected.
    Type: Grant
    Filed: March 3, 2017
    Date of Patent: October 23, 2018
    Assignee: Datamax-O'Neil Corporation
    Inventor: Teck Siong Soh
  • Patent number: 10078289
    Abstract: A method of operating a printing system includes determining whether ghosting is expected on a photoreceptor and applying power to a laser applied to the photoreceptor based on whether the ghosting is expected.
    Type: Grant
    Filed: November 29, 2016
    Date of Patent: September 18, 2018
    Assignee: HP Indigo B.V.
    Inventors: Mark Sandler, Shai Lior
  • Patent number: 9818776
    Abstract: An imaging system may include an image sensor that may be a backside illuminated (BSI) image sensor. The BSI sensor may be bonded to an inactive silicon substrate or bonded to an active silicon substrate like a digital signal processor (DSP). Through-oxide vias (TOVs) may be formed in the image sensor die. A bond pad region may be formed on a light shielding layer to facilitate coupling the light shield to a ground source or other power sources. Color filter housing structures may be formed over active image sensor pixels on the image sensor die. In-pixel grid structures may be integrated with the color filter housing structures to help reduce crosstalk. The light shielding layer may also be formed over reference image sensor pixels on the image sensor die. The TOVs, the in-pixel grid structures, and the light shielding structures may be formed simultaneously.
    Type: Grant
    Filed: April 8, 2015
    Date of Patent: November 14, 2017
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Swarnal Borthakur, Marc Sulfridge
  • Patent number: 9754926
    Abstract: An electronic device may include a packaging substrate having a packaging substrate face with a plurality of electrically conductive pads on the packaging substrate face. A first light emitting diode die may bridge first and second ones of the electrically conductive pads. More particularly, the first light emitting diode die may include first anode and cathode contacts respectively coupled to the first and second electrically conductive pads using metallic bonds. Moreover, widths of the metallic bonds between the first anode contact and the first pad and between the first cathode contact and the second pad may be at least 60 percent of a width of the first light emitting diode die. A second light emitting diode die may bridge third and fourth ones of the electrically conductive pads. The second light emitting diode die may include second anode and cathode contacts respectively coupled to the third and fourth electrically conductive pads using metallic bonds.
    Type: Grant
    Filed: February 14, 2011
    Date of Patent: September 5, 2017
    Assignee: CREE, INC.
    Inventors: Matthew Donofrio, John Adam Edmond, Hua-Shuang Kong, Peter S. Andrews, David Todd Emerson
  • Patent number: 9660414
    Abstract: A heat dissipation system for an optical module, related to communication fittings technologies, is provided to improve heat dissipation efficiency of the optical module. The heat dissipation system for an optical module includes a circuit card on which at least one optical module is mounted, where the optical module includes a housing and a laser disposed inside the housing. A first heat dissipation apparatus is fixedly disposed on the circuit card. A heat dissipation window is provided in an area that is above the laser and on the housing of the optical module. The first heat dissipation apparatus performs heat dissipation on the heat dissipation window.
    Type: Grant
    Filed: November 23, 2015
    Date of Patent: May 23, 2017
    Assignee: Huawei Technologies CO., Ltd.
    Inventors: Shuliang Huang, Mingliang Hao, Zaomeng Liu
  • Patent number: 9612433
    Abstract: A drive circuit for a resonant system provides an excitation signal having an amplitude and a phase. The resonant system provides a feedback signal representing an oscillation amplitude. The amplitude of the excitation signal is reduced for a substantially constant feedback signal amplitude by modifying the excitation signal phase.
    Type: Grant
    Filed: May 21, 2015
    Date of Patent: April 4, 2017
    Assignee: Microvision, Inc.
    Inventors: Patrick J. McVittie, Jonathan A. Morarity, Damon M. Domjan
  • Patent number: 9568853
    Abstract: In APC, if light power control with different target light powers is continuously executed, the amplitude of an output signal from a light-receiving element after the light power control is changed is generated, and a long time is required for completion of the light power control after the change. To address the problem, light power control with the same target light power is continuously executed on at least two light-emitting points in APC.
    Type: Grant
    Filed: June 23, 2014
    Date of Patent: February 14, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Katsuyuki Yamazaki
  • Patent number: 9548736
    Abstract: Technology is described for a relative timed clock gated cell. In one example, the relative timed clock gated cell includes a trigger latch and a data clock latch. The trigger latch includes a clock input coupled to a trigger line for transmitting a trigger signal. The trigger latch is configured to generate a data clock signal on an output. The trigger signal is based on a clock signal. The data clock latch includes a clock input coupled to the output of the trigger latch that latches a data input of the data clock latch based on the data clock signal. Various other computing circuitries and methods are also disclosed.
    Type: Grant
    Filed: June 15, 2015
    Date of Patent: January 17, 2017
    Assignee: The University of Utah Research Foundation
    Inventors: Kenneth S. Stevens, William Lee
  • Patent number: 9542612
    Abstract: Methods, systems, and apparatus including computer program products for using extracted image text are provided. In one implementation, a computer-implemented method is provided. The method includes receiving an input of one or more image search terms and identifying keywords from the received one or more image search terms. The method also includes searching a collection of keywords including keywords extracted from image text, retrieving an image associated with extracted image text corresponding to one or more of the image search terms, and presenting the image.
    Type: Grant
    Filed: January 13, 2016
    Date of Patent: January 10, 2017
    Assignee: Google Inc.
    Inventors: Luc Vincent, Adrian Ulges
  • Patent number: 9505212
    Abstract: There is provided a liquid discharging apparatus including: a modulation portion which generates a modulation signal pulse-modulated from a source signal; a gate driver which generates an amplification control signal based on the modulation signal; a transistor which generates an amplification modulation signal amplified from the modulation signal based on the amplification control signal; a low pass filter which demodulates the amplification modulation signal and generates a driving signal; a feedback circuit which sends back the driving signal to the modulation portion; a boosting circuit which supplies a voltage which has been boosted based on any one of a first clock signal and a second clock signal to the gate driver; a boosting control portion which controls boosting in the boosting circuit; and a piezoelectric element which is displaced as the driving signal is applied.
    Type: Grant
    Filed: November 11, 2015
    Date of Patent: November 29, 2016
    Assignee: Seiko Epson Corporation
    Inventor: Tetsuo Takagi
  • Patent number: 9465312
    Abstract: A driving unit causes first and second light emitting units each to emit light in a time following a pulse duty with a light amount at a first light emission level for printing on an image portion in an image formable region of a photosensitive member according to input of print data, and causes the first and the second light emitting units each to emit light with a light amount at a second light emission level of weak light emission on a non-image portion in the image formable region of the photosensitive member, and an adjustment unit adjusts each of first, second, third, and fourth driving currents for a plurality of times in one job.
    Type: Grant
    Filed: June 6, 2013
    Date of Patent: October 11, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masamichi Iida, Hideaki Hirasawa, Kiyoto Toyoizumi
  • Patent number: 9411257
    Abstract: An image forming apparatus is provided. The image forming apparatus includes a light source including a plurality of light emitting units to emit light corresponding to image data, and a light source controller to independently control lighting of each one of the light emitting units. The light source controller switches activation and deactivation of one or more of the light emitting units when the number of to-be-used light emitting units is smaller than the total number of the light emitting units included in the light source.
    Type: Grant
    Filed: July 13, 2015
    Date of Patent: August 9, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Yuki Honda, Takuma Nishio
  • Patent number: 9379169
    Abstract: OLED displays having a resolution of 300 dpi, 400 dpi, or greater are provided. Devices as disclosed may use one or more transistors, such as metal oxide transistors, which have a leakage current of not more than about 10?15 A/?m. Displays having sub-pixels with a largest dimension on the order of 60 ?m are also provided.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: June 28, 2016
    Assignee: Universal Display Corporation
    Inventors: Michael Hack, Michael Stuart Weaver, Julia J. Brown, Woo-Young So
  • Patent number: 9252693
    Abstract: In a stepping motor drive device, it is possible to prevent malfunction due to negative current from a stepping motor of a plurality of power MOSFETs that apply drive voltage in a complementary way to paired coils of the stepping motor. A fall delay circuit delays the timing of the fall of input pulse signals applied in a complementary way to the gate of each of a plurality of MOSFETs that apply drive voltage in a complementary way to paired coils of a stepping motor by a time Td, wherein Td>Trise?Tfall, in accordance with a rise time Trise when turning on, and a fall time Tfall when turning off, the relevant MOSFET, and after one MOSFET is turned on, another MOSFET is turned off.
    Type: Grant
    Filed: June 13, 2014
    Date of Patent: February 2, 2016
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Morio Iwamizu
  • Patent number: 9215768
    Abstract: A lighting unit (100) includes light emitting diode (LED) modules (120, 300) and a lighting driver (110, 200) connected to the LED modules. Each LED module includes LEDs (323) and an identification current source (324) supplying an identification current to an identification current output node (180, 380). All of the identification current output nodes are connected together to supply a total identification current having a magnitude which changes in response to the number of LED modules that are connected to the lighting driver. The lighting driver includes: a controllable current source (220 & 250) to supply an LED driving current to the LEDs of the LED modules, and a controller (230) that responds to the total identification current to control the controllable current source to supply the LED driving current at a magnitude which changes in response to the number of LED modules that are connected to the lighting driver.
    Type: Grant
    Filed: May 28, 2013
    Date of Patent: December 15, 2015
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Geert Willem Van Der Veen, Tijmen Cornelis Van Bodegraven
  • Patent number: 9155148
    Abstract: A light source drive device includes a first current source which provides a predetermined current to a light source corresponding to a predetermined light output, and a second current source which provides an overshoot current to the light source synchronized with the predetermined current. A processor is configured to set an overshoot time during which the overshoot current is provided to the light source. Further, an overshoot current is set which is applied to the light source. The overshoot time is set so that the overshoot time based on the rising of the predetermined current to when a light emission of the light source is detected.
    Type: Grant
    Filed: May 16, 2012
    Date of Patent: October 6, 2015
    Assignee: RICOH COMPANY, LTD.
    Inventors: Masaaki Ishida, Atsufumi Omori, Hayato Fujita
  • Patent number: 9128406
    Abstract: Disclosed is an array of light emitting semiconductor components for use in a digital printer. Each component includes a driver and at least one light emitting device. The array includes data buses connecting to first subsets of components, forming a first partition of said component. The array further includes auxiliary buses connecting to second subsets of components, forming a second partition of the components. The first partition and the second partition are chosen such that each component can be uniquely identified by the subset of the first and second partition to which it belongs. The data buses are configured to supply instructions to the first subsets of components. Each component is configured to extract instructions on the basis of its membership of a particular subset according to the second partition.
    Type: Grant
    Filed: October 7, 2013
    Date of Patent: September 8, 2015
    Assignee: Xeikon IP B.V.
    Inventor: Romain Jan Victor Paul van der Gucht
  • Patent number: 9081192
    Abstract: An optical scanning device includes a light source, a scanning portion that includes plural reflection surfaces, makes light beams incident to the reflection surface such that optical axis directions of the light beams emitted from the light emitting parts are tilted with respect to a direction perpendicular to the reflection surface, and scans the light beams in the main scanning direction through rotation, an optical system that includes an optical member made of a resin, is disposed between the scanning portion and the surface to be scanned, and makes the plural light beams incident to the surface to be scanned such that optical axes of the plural light beams are parallel to each other, and a correction portion that is provided in the optical system, and corrects positional deviation of scanning lines of the light beams in the sub-scanning direction on the surface to be scanned.
    Type: Grant
    Filed: May 31, 2013
    Date of Patent: July 14, 2015
    Assignee: FUJI XEROX CO., LTD.
    Inventor: Yoshiyuki Suzuki
  • Patent number: 9071173
    Abstract: A CPU determines that a motor is undergoing a forward rotation when a time difference between a detection timing of a light beam deflected by a rotating polygonal mirror and an output timing of a detection signal from a magnetic detector element falls within a predetermined range, and that the motor is undergoing a reverse rotation when the time difference does not fall within the predetermined range. With this configuration, a detection circuit for detecting voltage induced in three phases is unnecessary, and therefore the cost can be reduced. Furthermore, there is no need to detect voltage induced in each of the three phases. As it suffices to simply detect the time difference, the amount of time required to detect a rotation direction can be reduced.
    Type: Grant
    Filed: September 11, 2012
    Date of Patent: June 30, 2015
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Toshikazu Tsuchiya
  • Patent number: 9058768
    Abstract: A display device including a display panel having first pixels emitting light in a first field and second pixels emitting light in a second field is disclosed. According to one aspect, the display device includes a controller configured to extract first field data transmitted to the first pixels and second field data transmitted to the second pixels from input data, divide the first field data, insert black data between two neighboring first field data to generate first output data, divide the second field data, and insert black data between two neighboring second field data to generate second output data. The display device also includes a data driver configured to transmit a first data signal based on the first output data to the display panel in the first field and transmitting a second data signal based on the second output data to the display panel in the second field.
    Type: Grant
    Filed: July 30, 2012
    Date of Patent: June 16, 2015
    Assignee: Samsung Display Co., Ltd.
    Inventors: Seung-Woo Lee, An-Su Lee, Do-Youb Kim
  • Patent number: 9053958
    Abstract: An electronic device may include a packaging substrate having a packaging face and first and second pluralities of light emitting diodes electrically and mechanically coupled to the packaging face of the packaging substrate. The packaging substrate may include first and second electrically conductive pads on the packaging face. The light emitting diodes of the first plurality of light emitting diodes may be electrically coupled in parallel between the first electrically conductive pad and an interconnection structure on the packaging face. The light emitting diodes of the second plurality of light emitting diodes may be electrically coupled in parallel between the interconnection structure and the second electrically conductive pad.
    Type: Grant
    Filed: May 3, 2012
    Date of Patent: June 9, 2015
    Assignee: Cree, Inc.
    Inventors: Matthew Donofrio, Christopher P. Hussell, John Adam Edmond
  • Patent number: 9041757
    Abstract: An image forming apparatus including a control unit configured to cause the light irradiation unit to irradiate the photosensitive member at an image forming portion to which toner particles adhere with light emitted from the light source by a first light emission amount, and cause the light irradiation unit to irradiate the photosensitive member at a non-image forming portion to which no toner particles adhere with light emitted from the light source by a second light emission amount that is smaller than the first light emission amount. The image forming apparatus further includes an adjusting unit configured to adjust the first light emission amount and the second light emission amount, and an acquisition unit configured to acquire information relating to a speed of surface of the photosensitive member. The adjusting unit is configured to change the second light emission amount according to information acquired by the acquisition unit.
    Type: Grant
    Filed: June 5, 2013
    Date of Patent: May 26, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masahiro Hayakawa, Kengo Kawamoto
  • Patent number: 9041759
    Abstract: A laser scanning unit includes a laser light source, rotating polygon mirror, drive motor, and entry detection, intensity detection, intensity adjustment, and drive control portions. The laser light source radiates first and second laser lights in first second directions, respectively. The drive motor rotates the polygon mirror reflecting the first laser light. The intensity adjustment portion adjusts the first laser light in accordance with the second laser light detected by the intensity detection portion, until a second time after a first time has elapsed since the first laser light entry detection by the entry detection portion. The drive control portion, upon adjustment by the intensity adjustment portion, drives the drive motor at a first rotation speed, wherein a return light entry timing is included within the first time or from when the second time has elapsed to the timing of the entry detection portion detection.
    Type: Grant
    Filed: August 14, 2013
    Date of Patent: May 26, 2015
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Hironobu Oi
  • Patent number: 9041758
    Abstract: An optical scanning device includes: a driving unit that drives a light source that outputs multiple light beams; a deflecting unit that scans a scanning surface in a main-scanning direction by deflecting the light beams, the scanning surface moving at a predetermined line speed in a sub-scanning direction; and a control unit that changes number of the light beams according to the line speed by controlling the driving unit, changes a scanning speed of the deflecting unit in the main-scanning direction according to a difference between an exposure amount per unit length in the main-scanning direction after a change in the number of the light beams and a predetermined exposure amount, and changes light intensity of each of the light beams output by the light source according to an amount of a change in the scanning speed.
    Type: Grant
    Filed: July 22, 2013
    Date of Patent: May 26, 2015
    Assignee: RICOH COMPANY, LIMITED
    Inventor: Nobuyoshi Kaima
  • Patent number: 9035988
    Abstract: A light source driving device which drives a plurality of light emitting parts provided in a light source to emit a plurality of light beams based on image information, includes a plurality of driving circuits configured to drive the plurality of light emitting parts. Each of the driving circuits includes a signal generation circuit that generates a modulation signal to control a light emitting intensity of the corresponding light emitting part based on the image information, a detection circuit that detects a light emitting status of the corresponding light emitting part; and a light emitting circuit that outputs a driving signal to the corresponding light emitting part to emit a light beam in accordance with the modulation signal and adjustment data obtained based on the light emitting status of at least one of the plurality of light emitting parts.
    Type: Grant
    Filed: May 23, 2008
    Date of Patent: May 19, 2015
    Assignee: RICOH COMPANY, LTD.
    Inventors: Yasuhiro Nihei, Masaaki Ishida, Atsufumi Omori, Jun Tanabe
  • Patent number: 9024992
    Abstract: The oscillation element according to the present invention includes a torsion bar mounted on a base, and an oscillating member having a light reflection surface for reflecting light from a light source, which is fixed on the torsion bar protruding from the base. The oscillating member oscillates about a longitudinal axis of the torsion bar with an elastic deformation of the torsion bar, thereby deflecting the light that reflects at the light reflection surface in a direction intersecting the longitudinal axis. The oscillating member has two plates that are joined together so as to sandwich the torsion bar. On joining surfaces of the plates are provided with grooves for receiving the torsion bar, respectively. The plates have a symmetrical shape that the longitudinal axis serves as the axis of symmetry.
    Type: Grant
    Filed: January 4, 2012
    Date of Patent: May 5, 2015
    Assignee: Canon Denshi Kabushiki Kaisha
    Inventors: Takayuki Wakabayashi, Naruki Suzuki, Katsumi Arai, Yaomin Zhou
  • Patent number: 9001175
    Abstract: An optical scanning device comprising: a light source that emits a laser beam; and a driving unit connected to the light source and configured to drive the light source; the driving unit comprising: a first storage unit that stores in advance therein a setting value for controlling output of the laser beam; a second storage unit that stores temporally therein the setting value stored in the first storage unit; a storage controller connected to the first storage unit and the second storage unit; and a voltage detector connected to the storage controller and configured to detect a voltage value supplied to the driving unit, wherein the storage controller, upon the voltage detector detecting that the voltage supply is resumed, transfers the setting value stored in the first storage unit to the second storage unit automatically.
    Type: Grant
    Filed: September 10, 2013
    Date of Patent: April 7, 2015
    Assignee: Ricoh Company, Limited
    Inventors: Takao Watanabe, Shinji Kobayashi, Yasuhiro Izawa
  • Patent number: 8988476
    Abstract: An exposure device includes a board on which a light source for emitting a light beam is mounted and on which a circuit is disposed, a housing that contains an optical system for guiding the light beam, a positioning member that positions the light source relative to the housing in an optical axis direction by contacting a reference portion disposed around the light source, and a deformable portion disposed in a region of the board that is different from a region on which the circuit is disposed. The deformable portion urges the reference portion toward the positioning member by being elastically deformed when the board is attached to the housing.
    Type: Grant
    Filed: December 9, 2013
    Date of Patent: March 24, 2015
    Assignee: Fuji Xerox Co., Ltd.
    Inventor: Yoshiaki Haginoya
  • Patent number: 8982172
    Abstract: The oscillation element according to the present invention includes a torsion bar mounted on a base, and an oscillating member having a light reflection surface for reflecting light from a light source, which is fixed on the torsion bar protruding from the base. The oscillating member oscillates about a longitudinal axis of the torsion bar with an elastic deformation of the torsion bar, thereby deflecting the light that reflects at the light reflection surface in a direction intersecting the longitudinal axis. The oscillating member has two plates that are joined together so as to sandwich the torsion bar. On joining surfaces of the plates are provided with grooves for receiving the torsion bar, respectively. The plates have a symmetrical shape that the longitudinal axis serves as the axis of symmetry.
    Type: Grant
    Filed: January 4, 2012
    Date of Patent: March 17, 2015
    Assignee: Canon Denshi Kabushiki Kaisha
    Inventors: Takayuki Wakabayashi, Naruki Suzuki, Katsumi Arai, Yaomin Zhou
  • Patent number: 8963978
    Abstract: An exposure apparatus according to this invention uses both a first light source which outputs a light beam corresponding to a drive current corresponding to image information, and a second light source to irradiate the surface of a photosensitive drum with a plurality of light beams. The second laser light source irradiates the photosensitive drum with a laser beam in accordance with a drive current corresponding to a correction value according to which unevenness of potential characteristics due to unevenness of sensitivity of the surface of the photosensitive drum is reduced. The same region on the surface of the photosensitive drum is irradiated with laser beams which are output from the first and second laser light sources onto the photosensitive drum in superposition.
    Type: Grant
    Filed: April 9, 2012
    Date of Patent: February 24, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yuichi Seki
  • Patent number: 8957932
    Abstract: An exposure apparatus according to this invention uses, as a correction value, the difference between a threshold current obtained from the light emitting characteristics of a single laser light source when only the single laser light source emits a laser beam, and a threshold current obtained from the light emitting characteristics of the single laser light source when the single laser light source emits a laser beam while the bias currents are supplied to the remaining laser light sources other than the single laser light source. The exposure apparatus uses the correction value to correct bias currents and switching currents determined by APC, and exposes the surface of an image carrier with laser beams output from the plurality of laser light sources based on the corrected bias currents and switching currents.
    Type: Grant
    Filed: August 10, 2012
    Date of Patent: February 17, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventor: Katsuhide Koga
  • Patent number: 8957934
    Abstract: A light source drive circuit which drives a light source is disclosed, including a drive current generating unit which generates a drive current, the driving current including a predetermined current for obtaining a predetermined light amount from the light source; and first and second overshoot currents which are applied to the predetermined current in synchronization thereto; and a control unit which sets, to the drive current generating unit, a value of the first overshoot current to a fixed value, and a value of the second overshoot current in accordance with a light amount output from the light source.
    Type: Grant
    Filed: November 6, 2013
    Date of Patent: February 17, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Hayato Fujita, Atsufumi Omori, Muneaki Iwata, Masaaki Ishida
  • Patent number: 8957933
    Abstract: An optical writing device forming an electrical latent image on a photoreceptor includes an optical writing unit configured to apply light to the photoreceptor, a power supply unit configured to supply power to the optical writing unit, a power supply status detector configured to detect a power supply status of the power supplied from the power supply unit to the optical writing unit, and output power supply information or power cutoff information, a power cutoff information retaining unit configured to retain the power cutoff information when the power cutoff information is output from the power supply status detector, and a power sensor configured to sense a power supply status of the power supplied by the power supply unit based on the power cutoff information retained by the power cutoff information retaining unit.
    Type: Grant
    Filed: August 6, 2013
    Date of Patent: February 17, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Yoshinori Shirasaki, Tatsuya Miyadera, Masayuki Hayashi, Motohiro Kawanabe, Hiroaki Ikeda, Tomohiro Ohshima, Akinori Yamaguchi
  • Patent number: 8947485
    Abstract: A drawing control device includes: a fill-stroke generating unit that generates a fill stroke that includes a plurality of strokes that fill a drawing area; a shape-stroke generating unit that generates a shape stroke which is a stroke of a shape to be formed on the drawing area; a first detecting unit that detects an overlap portion where the fill stroke and the shape stroke overlap with each other; a modifying unit that removes the overlap portion from the fill stroke to modify the fill stroke to obtain a drawing stroke; a drawing-instruction generating unit that generates a drawing instruction for drawing each stroke in the drawing stroke; and a drawing control unit that controls a drawing device by using the drawing instruction to cause the drawing device to draw the drawing stroke on an object.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: February 3, 2015
    Assignee: Ricoh Company, Limited
    Inventor: Fumihiro Hasegawa
  • Patent number: 8947740
    Abstract: A method, non-transitory computer readable medium, and apparatus for adjusting a light intensity of a printhead are disclosed. For example, the method receives an image comprising a plurality of pixels, calculates a correction factor for each one of a plurality of pixels of the image by applying a filter to each one of the plurality of pixels of the image and summing a contribution of the light intensity of each one of a plurality of surrounding pixels to a pixel being analyzed to calculate an overlap value and comparing the overlap value to a development threshold range and adjusts the light intensity of a light source of the printhead in accordance with the correction factor of each one of the plurality of pixels of the image that require toner.
    Type: Grant
    Filed: February 17, 2014
    Date of Patent: February 3, 2015
    Assignee: Xerox Corporation
    Inventors: Michael J. Wilsher, Sebastián R. de Echaniz
  • Patent number: 8928715
    Abstract: A light source driver includes a controller which outputs an undershoot current in synchronization with lighting complete timing in lighting information, wherein the controller is configured to output the undershoot current such that a voltage in a light source when the output of the undershoot current is complete is equal to a voltage in the light source before being turned on.
    Type: Grant
    Filed: December 24, 2013
    Date of Patent: January 6, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Atsufumi Omori, Masaaki Ishida, Muneaki Iwata, Hayato Fujita
  • Patent number: 8928714
    Abstract: A semiconductor laser driver to drive at least one semiconductor laser, the semiconductor laser including a storage device, an emission-intensity setting device, and a drive circuit. The storage device stores emission-intensity switching data to control light-emission intensity of the semiconductor laser, the emission-intensity setting device sets the light-emission intensity based on the emission-intensity switching data stored in the storage device, and, the drive circuit generates a driving current to drive the semiconductor laser based on the light-emission intensity set in the emission-intensity setting device.
    Type: Grant
    Filed: March 18, 2011
    Date of Patent: January 6, 2015
    Assignee: Ricoh Company, Ltd.
    Inventor: Hiroaki Kyogoku
  • 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: 8917303
    Abstract: The optical writing device includes: a light source including a plurality of light-emitting element assemblies; a line information storage for storing pixel information constituting an image; a light source driver for driving the light-emitting elements; an error information acquire for acquiring inclination error information and arrangement error information; a correction value generator for generating correction value information for correcting the inclination of the main scanning line; a correction value holder for holding the generated correction value information; and a driven pixel adjuster for adjusting positions in the sub-scanning direction, wherein the correction value generator generates the correction value information such that a position of the image to be shifted to correct the error of the arrangement of the light-emitting element assemblies is different from that to correct the inclination of the main scanning line.
    Type: Grant
    Filed: July 8, 2013
    Date of Patent: December 23, 2014
    Assignee: Ricoh Company, Limited
    Inventor: Tatsuya Miyadera
  • Patent number: 8908000
    Abstract: A light-emitting device includes: plural light-emitting chips each having plural light-emitting elements, and each being designated, as a control target for lighting up or not lighting up, by two to Q designation signals (Q is an integer of two or more); and a selection signal generating part that selectively transmits P selection signals (P is an integer of three or more where P>Q) as the designation signals to designate each of the plural light-emitting elements as the control target, the designation signals for each of the plural light-emitting chips including a combination of two to Q selection signals taken from the P selection signals.
    Type: Grant
    Filed: September 20, 2013
    Date of Patent: December 9, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventor: Seiji Ohno
  • 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
  • Patent number: 8896648
    Abstract: A laser driving unit drives a semiconductor laser apparatus including a plurality of light sources, includes a light detecting part to detect light emissions from the light sources, a driving current generator to generate a driving current based on an input signal, an auxiliary driving current generator to generate an auxiliary driving current in an initial time period of an ON-time of the driving current, and an auxiliary current set part to set an auxiliary amount of the auxiliary driving current to be added to the driving current, for each of the light sources, based on a difference between the light emissions detected by the light detecting part and a target light emission of the light sources.
    Type: Grant
    Filed: March 14, 2011
    Date of Patent: November 25, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Atsufumi Omori, Masaaki Ishida
  • Patent number: 8866866
    Abstract: A drive circuit is provided for supplying a drive current to drive a plurality of driven elements. The drive circuit includes a switch circuit having an input terminal for receiving a drive signal alternately changing between an on state and an off state, and an output terminal connected to the driven elements; and a constant current circuit connected to the switch circuit for adjusting the drive current at a constant level. The constant current circuit is formed of a depletion type MOS transistor.
    Type: Grant
    Filed: August 1, 2013
    Date of Patent: October 21, 2014
    Assignee: Oki Data Corporation
    Inventor: Akira Nagumo
  • Patent number: 8866865
    Abstract: An image forming apparatus includes a light source that emits light beams for scanning a photoconductive element and for image forming of image data, a storage unit that stores a correction amount of a turn-on time of the light source associated with a preset turn-on pattern of the light beams, an acquiring unit that compares a pattern of the image data with the turn-on pattern, so as to acquire the correction amount corresponding to the pattern of the image data which is associated with the turn-on pattern, from the storage unit; and a light source controller that controls turn-on of the light source by a turn-on time corrected with acquired correction amount.
    Type: Grant
    Filed: March 17, 2011
    Date of Patent: October 21, 2014
    Assignee: Ricoh Company, Limited
    Inventor: Katsuhiko Maeda
  • Patent number: 8848012
    Abstract: A drive device to drive a plurality of three-terminal light emitting elements, comprising: a drive circuit including a first MOS transistor and configured to drive conducting three-terminal light emitting elements among a plurality of three-terminal light emitting elements based on a received drive signal. The first MOS transistor includes: a third terminal connected to a second power supply having a potential different from a potential of the first power supply; a fourth terminal connected to the second terminals connected in common, a second control terminal configured to control a conduction state between the third terminal and the fourth terminal based on the drive signal; and a substrate terminal set to have a potential different from the potential of the second power supply in a direction of increasing threshold voltage of the first MOS transistor.
    Type: Grant
    Filed: March 23, 2011
    Date of Patent: September 30, 2014
    Assignee: Oki Data Corporation
    Inventor: Akira Nagumo
  • Patent number: 8842147
    Abstract: An optical scanning device includes: light sources emitting first beams having colors; a beam splitting unit splitting the first beams into second beams; a deflecting unit including reflecting members, each corresponding to one of the second beams and each performing deflection scanning of the second beams; an optical system for image formation of the second beams scanning on target surfaces that have been assigned with colors corresponding to the first beams; a detecting unit for detecting which of the reflecting member corresponds to the second beam; an interchanging unit for obtaining data of a lines corresponding to each of the first beams and interchanging the data of the lines based on a detection result; and a light source control unit for controlling the light sources in such a way that the light sources emit the first beams in accordance with the data of the lines interchanged.
    Type: Grant
    Filed: March 14, 2011
    Date of Patent: September 23, 2014
    Assignee: Ricoh Company, Limited
    Inventor: Satoshi Ohmiya