Control Of Exposure Patents (Class 399/51)
  • Patent number: 10705448
    Abstract: In a case of performing a second rotation control to match the rotation phase of a first rotational polygon mirror with the rotation phase of a second rotational polygon mirror in a rising period, a period during which a non-image region is irradiated with light from both or one of a first light source and a second light source is controlled to be a second period longer than a first period.
    Type: Grant
    Filed: April 17, 2019
    Date of Patent: July 7, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yuki Nakajima
  • Patent number: 10534285
    Abstract: An information processing apparatus includes: a second reception unit configured to receive a predetermined signal outputted via a first signal line from the image forming unit; a third reception unit configured to receive a surface information outputted via a second signal line from the image forming unit; a storage unit configured to store, in association with the surface information, a plurality of pieces of correction data respectively corresponding to a plurality of reflecting surfaces; a correction unit configured to correct the image data to correspond to a reflecting surface onto which a light for scanning a photosensitive member is to be deflected, based on correction data; and a third output unit configured to, in response to receiving the predetermined signal, output the corrected image data.
    Type: Grant
    Filed: December 10, 2018
    Date of Patent: January 14, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yuichi Utsumi
  • Patent number: 10503093
    Abstract: An information processing apparatus capable of specifying a reflection surface cheaply and accurately. A connected image forming apparatus generates a signal having first and second levels on the basis of information about reflection surfaces of a polygon mirror so that a period of the first level corresponding to a predetermined reflection surface becomes longer than that corresponding to the other reflection surfaces. The information processing apparatus detects a first timing at which the signal changes to the first level from the second level and a second timing at which the signal changes to the second level from the first level, specifies the reflection surface based on a period from the first timing to the second timing that is detected first after elapsing a first period from the first timing, and corrects the image data corresponding to the reflection surface according to the surface information and correction data.
    Type: Grant
    Filed: November 23, 2018
    Date of Patent: December 10, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Takashi Yasuno
  • Patent number: 10474055
    Abstract: A period in which an adjustment unit adjusts a driving current such that the light irradiation unit emits a third light emission amount of light is switched to a period in which a light irradiation unit emits a second light emission amount of light, and the period in which the light irradiation unit emits the second light emission amount of light is switched to a period in which the light irradiation unit emits a first light emission amount of light.
    Type: Grant
    Filed: August 29, 2017
    Date of Patent: November 12, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yasukazu Maeda
  • Patent number: 10268137
    Abstract: An optical scanning device includes a light source having plural light emitting portions, a deflection unit that deflects and scans plural light beams emitted from the light source in a main scanning direction, and plural optical element groups disposed between the light source and the deflection unit and including an optical element having a negative refractive power along a sub-scanning direction intersecting the main scanning direction. An interval in the sub-scanning direction of the plural light beams is adjusted by tilting the optical element having the negative refractive power on an axis along the main scanning direction.
    Type: Grant
    Filed: April 21, 2017
    Date of Patent: April 23, 2019
    Assignee: FUJI XEROX CO., LTD.
    Inventor: Yoshiyuki Suzuki
  • Patent number: 10158780
    Abstract: An image forming apparatus includes a light-receiving unit that includes light-receiving elements arranged along a movement direction of a target formed on an image carrier, and is arranged so as to receive light emitted from a light-emitting unit and specularly reflected off the image carrier; a member configured to limit a size, in the movement direction, of diffused reflection light that is incident on the light-receiving unit; a selection unit configured to select whether or not each of the light-receiving elements in the light-receiving unit is an effective light-receiving element; a generation unit configured to generate a detection signal from an output of the effective light-receiving element; and a detection unit configured to detect a target formed on the image carrier based on the detection signal.
    Type: Grant
    Filed: January 11, 2018
    Date of Patent: December 18, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takuya Mukaibara, Takashi Fukuhara, Kazushi Ino, Naoki Nishimura, Keisuke Nakano
  • Patent number: 10010926
    Abstract: A method is provided wherein a metallic container is filled with a consumer identified beverage, seamed to a metallic end closure, distributed, and sold to the consumer. Thus, a consumer has influence and control over volume, qualities, and size of the beverage along with specific characteristics regarding the size and shape of the metallic container.
    Type: Grant
    Filed: June 5, 2014
    Date of Patent: July 3, 2018
    Assignee: Ball Corporation
    Inventor: James W. Billings
  • Patent number: 9874830
    Abstract: An image forming apparatus has a control portion configured to control a charging bias to be applied to a charging member and a first exposure amount with respect to humidity inside an image forming apparatus and a thickness of a photosensitive layer of a photoreceptor, and the control portion controls the charging bias and the first exposure amount so that a potential difference between a non-image forming portion and the charging member increases as the humidity decreases, and decreases as the humidity increases.
    Type: Grant
    Filed: September 20, 2016
    Date of Patent: January 23, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Yuji Kawaguchi
  • Patent number: 9857724
    Abstract: A relationship between a light amount of an exposure portion and a surface potential according to a use amount, a first detection light amount corresponding to a prescribed surface potential in the relationship where a use amount of a photosensitive member is a first use amount and a second detection light amount corresponding to the prescribed surface potential in the relationship where the use amount of the photosensitive member is a second use amount, which is greater than the first use amount, are acquired. The exposure portion changes, as an electrostatic image forming light amount, a first image forming light amount representing a setting value under the first use amount to a second image forming light amount representing a setting value under the second use amount on the basis of a ratio of the first detection light amount to the second detection light amount.
    Type: Grant
    Filed: August 24, 2016
    Date of Patent: January 2, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kazumi Yamauchi, Katsuichi Abe, Taku Watanabe
  • Patent number: 9854130
    Abstract: An image reading apparatus includes an image reading chip for reading an image. The image reading chip includes a plurality of pixel units which include a light receiving element which receives light from the image so as to perform photoelectric conversion, an analog circuit, a logic circuit, and a power source pad to which a power source voltage is supplied. The image reading chip has a shape which includes a first side and a second side shorter than the first side. A distance between the analog circuit and a median point of the first side is shorter than a distance between the logic circuit and the median point of the first side, and a distance between the analog circuit and the power source pad is shorter than a distance between the logic circuit and the power source pad.
    Type: Grant
    Filed: December 13, 2016
    Date of Patent: December 26, 2017
    Assignee: Seiko Epson Corporation
    Inventor: Takafumi Suzuki
  • Patent number: 9753397
    Abstract: An image forming apparatus includes: a first optical head group including first optical heads arranged in a sub-scanning direction; a second optical head group including second optical heads arranged in the sub-scanning direction and overlapping the first optical head group in a main scanning direction; a detector that detects displacement amounts between the first optical heads and the second optical heads; and a controller that performs registration based on the detection by the detector. The controller performs, with one of the first optical heads as a reference, registration on the other first optical heads, performs, with one of the second optical heads as a reference, registration on the other second optical heads, and performs registration between the first optical head group and the second optical head group based on a displacement amount between one of the first optical heads and one of the second optical heads.
    Type: Grant
    Filed: September 19, 2016
    Date of Patent: September 5, 2017
    Assignee: OKI DATA CORPORATION
    Inventor: Tsutomu Kosasa
  • Patent number: 9746795
    Abstract: An optical writing control device controls emission or lighting of a light source onto a photoconductor surface in a latent image forming process and a discharge process, by either setting a light emission time longer in the discharge process or setting a resolution in a sub-scanning direction lower in the discharge process, compared to the latent image forming process.
    Type: Grant
    Filed: March 9, 2016
    Date of Patent: August 29, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Motohiro Kawanabe, Yoshinori Shirasaki, Masayuki Hayashi, Masatoshi Murakami, Yuusuke Kohri, Akinori Yamaguchi
  • Patent number: 9703231
    Abstract: An optical scanner includes a light source; a rotating polygon mirror that reflects and deflects the light beam output from the light source; a drive unit that rotationally drives the rotating polygon mirror; a beam detection unit that detects the light beam; and a control unit that controls the light source and the drive unit. The control unit can control the drive unit with a detection result of the beam detection unit, and adjust a rotational speed of the rotating polygon mirror. The control unit has a high definition mode in which the rotational speed of the rotating polygon mirror is controlled with high accuracy at the time of normal light beam irradiation, and a light source life mitigation mode in which light beam irradiation is performed by controlling the output of the light source with keeping rotation of the rotating polygon mirror during standby.
    Type: Grant
    Filed: March 22, 2016
    Date of Patent: July 11, 2017
    Assignee: KONICA MINOLTA, INC.
    Inventor: Takatoshi Hamada
  • Patent number: 9696651
    Abstract: An image-forming apparatus includes a light-irradiation unit configured to move a spot of laser light on a surface of a photosensitive member at a non-constant scanning velocity in a main scanning direction to form a latent image on the photosensitive member, an image data correcting unit configured to correct a length in the main scanning direction of image data by inserting one or more image data pieces into the image data, the number of the image data pieces increasing as the scanning velocity increases, and/or extracting one or more image data pieces from the image data, the number of the image data pieces increasing as the scanning velocity decreases, and a brightness correcting unit configured to correct a brightness of the laser light so that an emission brightness increases as the scanning velocity increases and/or the emission brightness decreases as the scanning velocity decreases.
    Type: Grant
    Filed: March 9, 2016
    Date of Patent: July 4, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takashi Kawana, Kazuyuki Ishihara, Yuuji Takayama, Hikaru Uchidate, Yoshihiko Tanaka, Hiroyuki Fukuhara, Shuichi Kurokawa
  • Patent number: 9651891
    Abstract: When an edge effect or sweeping occurs in a developing material, pixels, among a plurality of pixels that configure image data, will arise in which a developing material consumption amount rises beyond an original consumption amount. A CPU corrects the developing material consumption amount for the pixels, among the plurality of pixels that configure the image data, in which the developing material consumption amount will rise beyond the original consumption amount.
    Type: Grant
    Filed: July 8, 2016
    Date of Patent: May 16, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventors: Go Araki, Norihito Naito
  • Patent number: 9442411
    Abstract: An image forming apparatus, including: a photosensitive member; a light source configured to emit a light beam; a deflecting unit configured to deflect the light beam to scan the photosensitive member to form an electrostatic latent image and having a rotary polygon mirror and a motor configured to rotate the rotary polygon mirror; a housing provided with the photosensitive member, the light source, and the deflecting unit; a temperature detecting unit configured to detect a temperature; and a control unit configured to pre-rotate the rotary polygon mirror before a start signal for image formation and to rotate, after the start signal, the rotary polygon mirror at a rotation speed higher than a rotation speed for pre-rotation of the rotary polygon mirror, wherein the control unit sets a target value of the rotation speed for the pre-rotation based on a result of detection by the temperature detecting unit.
    Type: Grant
    Filed: October 24, 2014
    Date of Patent: September 13, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Hirohisa Kato
  • Patent number: 9417579
    Abstract: When an edge effect or sweeping occurs in a developing material, pixels, among a plurality of pixels that configure image data, will arise in which a developing material consumption amount rises beyond an original consumption amount. A CPU corrects the developing material consumption amount for the pixels, among the plurality of pixels that configure the image data, in which the developing material consumption amount will rise beyond the original consumption amount.
    Type: Grant
    Filed: February 4, 2016
    Date of Patent: August 16, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventors: Go Araki, Norihito Naito
  • Patent number: 9341976
    Abstract: The apparatus includes a CPU which executes, based on a detection result of a BD sensor, start-up control for controlling driving of a scanner motor, so that a rotation number of the scanner motor reaches a predetermined rotation number, and executes determination control for determining a voltage to be applied to a primary transfer unit based on a detection result of a transfer current detection circuit by a transfer voltage output circuit upon execution of image formation, and when an image forming station K which executes image formation is different from an image forming station Y including the BD sensor, the CPU parallelly executes the start-up control and determination control.
    Type: Grant
    Filed: December 5, 2013
    Date of Patent: May 17, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Hiroki Hashii, Yuya Kojima
  • Patent number: 9335673
    Abstract: An image forming apparatus includes: a rotatable image bearing member; a transferring member that forms a transfer nip portion with the image bearing member; a voltage application section that applies a voltage to the transferring member in such a manner that a certain amount of current flows through the transferring member; and a control section that sets a front-end current to a current that flows through the transferring member when a voltage having a polarity opposite to a transfer polarity and an absolute value substantially the same as or greater than an absolute value of a surface potential of the image bearing member is applied to the transferring member, the control section controlling the voltage application section in such a manner that the set front-end current flows through the transferring member when a front-end portion of a recording sheet in a conveyance direction passes through the transfer nip portion.
    Type: Grant
    Filed: March 20, 2014
    Date of Patent: May 10, 2016
    Assignee: KONICA MINOLTA, INC.
    Inventor: Yotaro Sato
  • Patent number: 9233555
    Abstract: A scanning system for use in an imaging apparatus includes a first light source and a second light source for emitting light beams for generating an image. A driver circuitry has first and second outputs connected to the first and second light sources, respectively, for controlling the first and second light sources. A signal transmitter includes a first interface for communicating a clock signal to the driver circuitry and a second interface for communicating an image information signal to the driver circuitry. During a clock cycle of the clock signal, the driver circuitry captures a first bit information from the image information signal at a rising edge of the clock signal and a second bit information from the image information signal at a falling edge of the clock signal. Thereafter, the driver circuitry drives the first and second light sources based on the first and second bit information captured, respectively.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: January 12, 2016
    Assignee: Lexmark International, Inc.
    Inventors: John Bruce Berry, William Pohl Corbett, Jr.
  • Patent number: 9195918
    Abstract: A light scanning device that performs rapid scanning synchronization timing detection to thereby enable automatic light amount control to be executed rapidly and with high accuracy. A light amount sensor disposed on a scanning line of the laser light receives the laser light. A controller controls the timing of emission by the laser emitting device and a light amount of the laser light based on image data, according to an output from the light amount sensor. A temperature sensor detects the temperature of the laser emitting device or in the light scanning device. A storage section stores data indicative of a relationship between temperature, current supplied to the laser emitting device, and light amount. A controller controls current to be supplied to the laser emitting device based on temperature detected by the temperature detecting unit and data stored in the storage section.
    Type: Grant
    Filed: January 25, 2012
    Date of Patent: November 24, 2015
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Satoru Takezawa
  • Patent number: 9146515
    Abstract: In an image forming apparatus, in the case where a time necessary for a developer bearing member to rotate from a measurement position where an attracting unit attracts the toner on the developer bearing member to a developing position at which an electrostatic latent image on the photosensitive member is developed by a toner on the developer bearing member is represented by a time Tqcm, a time necessary for the photosensitive member to rotate from an exposure position at which an exposure unit exposes the photosensitive member to the developing position is represented by a time Tetd, and a time necessary for a control unit to control an exposing condition based on a charge amount measured by a measuring unit is represented by a time Tp, the attracting unit is disposed so that Tqcm?Tedt+Tp holds true.
    Type: Grant
    Filed: April 15, 2014
    Date of Patent: September 29, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Megumi Uchino, Yoshihiro Shigemura, Shingo Horita, Masaaki Naoi, Mineto Yagyu
  • Patent number: 9134644
    Abstract: Provided is a charging member contamination determining device including plural units that includes a charging member, a member to be charged and a measuring section that measures a discharging current value between the charging member and the member to be charged, a calculating section that calculates a difference between current values measured by two units among the plural units, and a determining section that determines the presence or absence of contamination in the charging member based on the difference between the current values for each combination of two units calculated by the calculating section.
    Type: Grant
    Filed: June 9, 2014
    Date of Patent: September 15, 2015
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yoshiro Yamaguchi, Toru Ishii
  • Patent number: 9116456
    Abstract: An image forming apparatus includes an exposure device configured to expose image bearing members charged by charging devices to form latent images on the image bearing members, and a control unit configured to, in ether one or both of an image forming unit A and an image forming unit B, adjust an amount of exposure by which the image bearing member is exposed and a charging voltage based on information about the image bearing members of the image forming units A and B. The control unit is configured to make the charging voltage and the amount of exposure in the image forming unit A different from the charging voltage and the amount of exposure in the image forming unit B.
    Type: Grant
    Filed: October 23, 2013
    Date of Patent: August 25, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Akimichi Suzuki, Motoki Adachi, Yusuke Shimizu, Yuichiro Hirata, Naoki Fukushima
  • Patent number: 9030513
    Abstract: A color image forming apparatus has a light emitting element emitting light, a laser driving unit causing the light emitting element to emit light of a light amount at a first emission level for visualizing a toner image onto a first area where the toner image is to be visualized on a charged photosensitive member and to emit light of a light amount at a second emission level for weak emission onto a second area where the toner is not to be adhered to the charged photosensitive member. In addition, an acquiring unit acquires information of an integrated number of rotations of the photosensitive member, a drive current adjusting unit adjusts the drive current for the second emission level, and changes a magnitude of the drive current for the second emission level in accordance with the information of the integrated number of rotations of the photosensitive member.
    Type: Grant
    Filed: July 23, 2014
    Date of Patent: May 12, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kiyoto Toyoizumi, Masaru Shimura, Hideo Nanataki, Kengo Kawamoto
  • Publication number: 20150125170
    Abstract: An image forming apparatus includes an exposure control unit that performs control, based on a shift-amount of an exposure position from an ideal position, the shift-amount being obtained from a detection-result of a misregistration correcting pattern image, to shift at least one of an exposure timing corresponding to first image data which is input to one of two electric cables in contact with a target electric cable and an exposure timing corresponding to second image data which is input to another one of the two electric cables, with respect to an exposure timing corresponding to target image data being input to the target electric cable both sides of which are in contact with the two other electric cables, among a plurality of the electric cables which corresponds respectively to a plurality of the exposure units provided for each of a plurality of colors.
    Type: Application
    Filed: October 10, 2014
    Publication date: May 7, 2015
    Inventors: Yoshinori SHIRASAKI, Masayuki HAYASHI, Motohiro KAWANABE, Masatoshi MURAKAMI
  • Publication number: 20150125168
    Abstract: An image forming apparatus includes an image bearer; a charger to charge the image bearer; an electrostatic latent image former to form an electrostatic latent image on the image bearer; an image developer to develop the electrostatic latent image with a toner to form a visual toner image; a transferer to transfer the toner image on a transfer material; a toner concentration calculator to calculate a concentration of the toner; and an optical detector. At least a toner patch image is formed on the image bearer with an irradiation quantity set such that an irradiated part potential is larger than a developing condition, the toner patch image is read by the optical detector, and the charging condition is corrected on the basis of a difference between a toner concentration of the toner patch image and a target toner concentration.
    Type: Application
    Filed: October 17, 2014
    Publication date: May 7, 2015
    Inventors: Keita GOTOH, Akira YOSHIDA
  • Publication number: 20150125171
    Abstract: An image forming apparatus includes: a pseudo-halftone processing unit that processes input image data to output image data of first resolution; a resolution converting unit that converts the image data of the first resolution into image data of second resolution that is higher than the first resolution; a modulation-signal generating unit that generates a modulation signal obtained by modulating the image data of the second resolution according to a clock signal; and a light-source driving unit that drives a light source according to the modulation signal. The pseudo-halftone processing unit converts a region of pixels having the same pixel value into a parallel line pattern that is formed with a plurality of parallel lines oblique relative to a direction of arrangement of pixels. The resolution converting unit generates the image data o in which each edge of the lines forming the parallel line pattern is smoothed.
    Type: Application
    Filed: January 15, 2015
    Publication date: May 7, 2015
    Inventors: Muneaki IWATA, Masaaki ISHIDA, Atsufumi OMORI, Hayato FUJITA
  • Publication number: 20150117887
    Abstract: An image forming apparatus includes a process unit arranged in the vicinity of the circumference of each photosensitive member and the process unit is configured to act on the photosensitive member in forming a toner image thereon. The image forming apparatus detects a time period since a laser beam emission unit emits a laser beam to the photosensitive member to form an electrostatic latent image for detection until the formed electrostatic latent image for detection or a toner image based on the electrostatic latent image for detection reaches the process unit, and performs color misregistration correction control based on the result of detection. In this case, a control unit at least decreases the light amount of a pre-exposure LED when the electrostatic latent image for detection passes through a position facing the pre-exposure LED.
    Type: Application
    Filed: January 8, 2015
    Publication date: April 30, 2015
    Inventors: Hiroshi Hagiwara, Takamitsu Soda, Akinobu Hirayama, Hiromitsu Kumada, Yoshiko Kubo, Takateru Ohkubo
  • Publication number: 20150117885
    Abstract: An image forming apparatus includes an update unit configured to cause an image forming unit to form a first measurement image, cause a measurement unit to measure the first measurement image, and update a process condition based on a measurement result; a first determination unit configured to cause the image forming unit to form a plurality of second measurement images, cause the measurement unit to measure the plurality of second measurement images, and determine the process condition based on a measurement result, the plurality of second measurement images being formed according to a plurality of test process conditions; and a second determination unit configured to determine the plurality of test process conditions, based on an environment information obtained by an obtainment unit and the process condition updated by the update unit.
    Type: Application
    Filed: October 17, 2014
    Publication date: April 30, 2015
    Inventor: Yasuhito Shirafuji
  • Patent number: 8977150
    Abstract: An image forming apparatus includes a rotatable photoconductor, a charging unit, an exposure unit to expose the photoconductor to reduce an electrical potential at the photoconductor, a developing unit to charge the toner held on a toner bearing member with friction and attract the toner to the exposed portion on the photoconductor by supplying a development voltage from a first power source and using an electrical potential difference between the toner bearing member and the photoconductor in the development area, a reverse development voltage controller to supply a reverse development voltage while a non-charged portion on the photoconductor passes the development area, and a developer reducing potential applier to supply a development restraining potential and an absolute value smaller than a target charging potential to the photoconductor while the reverse development voltage is supplied.
    Type: Grant
    Filed: November 15, 2012
    Date of Patent: March 10, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Shin Yamamoto, Shin Murayama, Yoshio Sakagawa, Yuji Nagatomo
  • Patent number: 8971741
    Abstract: An image forming device includes each of developing devices including an image carrying part, a charging part that charges the image carrying part, a developing part on which a developing voltage is applied and which attaches developer to the image carrying part to develop the electrostatic latent image, and a control part that controls each of the developing devices. The developers are a white developer and other color developers, one of the developing devices using the white developer being defined the white developing device, the others using the other color developers being defined the non-white developing devices, and a developing potential difference of the white developing device is smaller than other developing potential differences of the non-white developing devices, the developing potential difference being defined between the developing voltage and potential of the image carrying part of the each developing device.
    Type: Grant
    Filed: July 24, 2013
    Date of Patent: March 3, 2015
    Assignee: Oki Data Corporation
    Inventor: Hidetaka Mitsunobu
  • Publication number: 20150055967
    Abstract: The image forming apparatus includes a determination unit configured to determine whether or not a polygon mirror has converged to the number of rotations that allows image formation to be performed, and the determination unit is capable of detecting a first timing and a second timing and determines that the polygon mirror has converged to a number of rotations that allows the image formation to be performed based on an earlier one of the first timing and the second timing.
    Type: Application
    Filed: October 30, 2014
    Publication date: February 26, 2015
    Inventors: Jun Nagatoshi, Akihiro Fukutomi, Daisuke Miyagawa, Naoki Inoue
  • Patent number: 8958708
    Abstract: An image forming apparatus includes a first image forming portion including a first photosensitive member, a first charging member to electrically charge the first photosensitive member, and a first exposure member to expose to light the charged first photosensitive member to form an electrostatic latent image, and a second image forming portion including a second photosensitive member, a second charging member to electrically charge the second photosensitive member, and a second exposure member to expose to light the charged second photosensitive member to form an electrostatic latent image.
    Type: Grant
    Filed: May 7, 2012
    Date of Patent: February 17, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventor: Etsuji Kojima
  • Patent number: 8953962
    Abstract: An image forming apparatus may include a first and second mode. In the first mode, the image forming apparatus uses a second charging member to charge toner that remains on an intermediate transfer member and then transfers the charged, remaining toner to an image carrier in a primary transfer portion. In the second mode, the image forming apparatus transfers the remaining toner adhered to the second charging member in the first mode to the intermediate transfer member. Also in a second mode, the image forming apparatus controls so that a surface potential of the image carrier that reaches the primary transfer portion at a timing at which the remaining toner transferred to the intermediate transfer member passes through the primary transfer portion has a same polarity as that of a surface potential of the image carrier in the first mode and also has an absolute value smaller than that thereof.
    Type: Grant
    Filed: February 20, 2014
    Date of Patent: February 10, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Keisuke Ishizumi, Seiji Saito, Tomoo Akizuki, Takeshi Shinji
  • Patent number: 8948632
    Abstract: An image forming apparatus including: a photosensitive member; a conveying member; an exposure head; a developing unit; an image forming unit; a concentration sensor having a first detection width in a conveyance direction and a second detection width in an axial direction of the photosensitive member; and a control unit, wherein the control unit controls the exposure head and the image forming unit to form a first image for correction, which includes a straight line part extending in the axial direction of the photosensitive member and having a length equal to or larger than the second detection width of the concentration sensor, on the conveying member, and wherein the control unit corrects a developing bias to be applied to the developing unit based on a detection result of the first image for correction by the concentration sensor.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: February 3, 2015
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Junichi Yokoi
  • Publication number: 20150016832
    Abstract: An image forming apparatus includes a control unit configured to form electrostatic latent images for correction on a photosensitive member a voltage application unit configured to apply a voltage to a process unit; a current detection unit configured to detect a current to the voltage application unit via the process unit when the voltage is applied to the process unit; and a conversion unit configured to convert an output value detected by the current detection unit such that a variation range of the output value detected by the current detection unit at a formation period of the electrostatic latent image for correction becomes larger than a variation range of the output value detected by the current detection unit at a one-rotation period of the photosensitive member on which the electrostatic latent image is not formed.
    Type: Application
    Filed: September 29, 2014
    Publication date: January 15, 2015
    Inventors: Hiromitsu Kumada, Hiroshi Hagiwara, Takateru Ohkubo, Akinobu Hirayama, Yoshiko Kubo
  • Patent number: 8934798
    Abstract: An image forming apparatus includes an exposure unit configured to form a latent image by irradiating a charged photosensitive member with light, and a control unit configured to cause the exposure unit to expose an image portion to which toner of the photosensitive member is to be adhered by a first exposure amount, and expose a non-image portion to which the toner of the photosensitive member is not to be adhered by a second exposure amount which is smaller than the first exposure amount. The control unit corrects the preset second exposure amount based on information about a difference between the charging voltage output from the charging unit and a predetermined charging voltage and/or information about a difference between the developing voltage output from the developing unit and a predetermined developing voltage.
    Type: Grant
    Filed: September 9, 2013
    Date of Patent: January 13, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventor: Masahiro Hayakawa
  • Publication number: 20150010316
    Abstract: An anamorphic optical element and an adjustment mechanism for selectively rotating the optical element either around an axis substantially in a vertical direction, an axis substantially in an optical axis direction, an axis substantially in a plane formed by the vertical direction and the optical axis direction, or combination of axes thereof is used to vary a vertical separation between two or more spots.
    Type: Application
    Filed: September 23, 2014
    Publication date: January 8, 2015
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Michael Plotkin, David Towner, Haim Livne, Peter Gysling, Craig Breen, Dale Wolin
  • Patent number: 8928713
    Abstract: An optical writing device includes: a photosensitive element whose surface relatively moves with respect to a light source by rotation; a pixel information acquiring unit that acquires pixel information of an image to be formed on the photosensitive element as an electrostatic latent image; a line pixel information storing unit that stores the pixel information for every main scanning line; a light emission control unit that causes a light source to emit light based on the pixel information; a rotation position recognizing unit that recognizes a rotation position of the photosensitive element; and a light quantity control unit that controls a light quantity of the light source based on the pixel information of every one main scanning line in accordance with the rotation position, with reference to correction value information in which the rotation position and information related to a correction of the light quantity are associated.
    Type: Grant
    Filed: February 14, 2012
    Date of Patent: January 6, 2015
    Assignee: Ricoh Company, Limited
    Inventors: Tatsuya Miyadera, Kunihiro Komai
  • Patent number: 8929759
    Abstract: An image forming apparatus includes: a density detection unit that detects densities of an image developed by a developing unit at a plurality of positions in a main-scanning direction; a processing unit that obtains at least one of an amplitude and a phase of a first periodical density change of the image, of which cycle is a rotation cycle of a photosensitive drum, at the plurality of positions in the main-scanning direction on the basis of an output signal of the density detection unit, and corrects a drive signal for the light source so as to suppress the first periodical density change of the image at each position in the main-scanning direction on the basis of the rotation cycle of the photosensitive drum and at least one of the amplitude and the phase.
    Type: Grant
    Filed: May 8, 2013
    Date of Patent: January 6, 2015
    Assignee: Ricoh Company, Limited
    Inventors: Muneaki Iwata, Kazuhiro Akatsu, Masaaki Ishida, Atsufumi Omori, Hayato Fujita
  • Publication number: 20140363183
    Abstract: An image forming apparatus includes; an exposure unit configured to perform, based on the image data, first exposure for a photosensitive member and second exposure for the photosensitive member exposed by the first exposure; a determination unit configured to determine a type of the image to be formed based on image data; and a control unit configured to control the exposure unit such that a difference in an exposure amount between the first exposure and the second exposure performed based on the image data when the type of the image is a character is larger than the difference in the exposure amount between the first exposure and the second exposure performed based on the image data when the type of the image is a picture.
    Type: Application
    Filed: August 26, 2014
    Publication date: December 11, 2014
    Inventors: Nobuhiko Zaima, Tomohisa Itagaki, Takahiro Ishihara, Yasuhito Shirafuji
  • Patent number: 8903260
    Abstract: An image forming apparatus and a control method include a photosensitive unit having a photosensitive drum, an exposure unit to form an electrostatic latent image on the photosensitive drum, a developing unit to form a toner image by sequentially supplying a plurality of color toners to the electrostatic latent images formed on the photosensitive drum, an intermediate transfer unit having an intermediate transfer belt to perform a first transfer of the toner image formed on the photosensitive drum in a sequential manner by color, a transfer roller configured to perform a second transfer of the toner image on a printing medium , a transfer belt cleaning unit to perform a cleaning task to remove a waste toner that remains on the intermediate transfer belt after the second transfer is performed, and a control unit to start performing idling of the intermediate transfer belt when an exposure with respect to one page toner image is completed and the first transfer is in progress, and to start the second transfer b
    Type: Grant
    Filed: January 11, 2013
    Date of Patent: December 2, 2014
    Assignee: SAMSUNG Electronics Co., Ltd.
    Inventor: Sangbum Woo
  • Publication number: 20140348523
    Abstract: An image forming apparatus includes an image bearing member that bears a developer image, a transfer apparatus that transfers the developer image, a charge apparatus, an exposure apparatus that exposes the surface of the image bearing member with light to form a latent image, and a developing apparatus that collects and supplies the developer to the latent image to form the developer image, in which an image formation area is divided into an image part and a non-image part where the developer image is not formed, the exposure apparatus exposes the non-image part with light at an exposure amount lower than an exposure amount with respect to the image part, and the charging apparatus charges the image bearing member and the exposure apparatus exposes the image part and the non-image part with light in a state in which the developer remains on the image bearing member.
    Type: Application
    Filed: May 20, 2014
    Publication date: November 27, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Takashi Hiramatsu, Yasunari Watanabe
  • Publication number: 20140348525
    Abstract: An image forming apparatus includes: an image forming section including a light exposure section configured to expose an image bearing member to light to form an electrostatic latent image, the image forming section being configured to form a toner image on the image bearing member, and to form an image on a recording sheet by transferring the toner image onto the recording sheet; an estimation section configured to estimate a density lowering position on the basis of image data of an image formed by the image forming section, the density lowering position being a position where decrease in image density relative to a predetermined image density is caused in the image; and a control section configured to increase a light exposure amount at the density lowering position estimated by the estimation section on the image bearing member to an amount greater than a predetermined light exposure amount.
    Type: Application
    Filed: May 1, 2014
    Publication date: November 27, 2014
    Applicant: Konica Minolta, Inc.
    Inventors: Natsuko MINEGISHI, Hideaki TANAKA, Tetsuya ISHIKAWA, Ryoei IKARI, Shintaro SONE
  • Patent number: 8896643
    Abstract: An image forming apparatus including: a photoreceptor; a charger configured to charge a photoreceptor surface; an optical scanning device configured to expose the photoreceptor surface to form an electrostatic latent image thereon; a developing device configured to develop the electrostatic latent image to form a toner image thereon; a transfer member configured to transfer the toner image to a sheet; a fixing device configured to fix the toner image thereon; and a control unit configured to carry out exposure amount control for formation of an image having a pattern with a spatial frequency from 0.1 c/mm to 3.0 c/mm so that after the exposure, there will be an electric potential difference V1 between an edge portion and a non-edge portion of the pattern and so that there will be an electric potential difference V2 larger than V1 between an edge-surrounding portion and the other portions of a non-image area.
    Type: Grant
    Filed: December 30, 2013
    Date of Patent: November 25, 2014
    Assignee: Konica Minolta, Inc.
    Inventor: Yohei Nakade
  • Publication number: 20140334835
    Abstract: Provided is a color image forming apparatus which has photosensitive members and a light irradiation unit irradiating at least one of the photosensitive members, the color image forming apparatus including: a laser driving unit causing the light irradiation unit to emit light of a light amount at a first emission level for printing when exposing an image portion and to emit light of a light amount at a second emission level for weak emission when exposing a non-image portion; an acquiring unit acquiring information of remaining lifetime of each of the photosensitive members; a first light intensity adjusting unit adjusting a first drive current to emit light at the first emission level; and a second light intensity adjusting unit adjusting a second drive current to emit light at the second emission level, the second light intensity adjusting unit changing the second drive current in accordance with the information.
    Type: Application
    Filed: July 23, 2014
    Publication date: November 13, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Kiyoto Toyoizumi, Masaru Shimura, Hideo Nanataki, Kengo Kawamoto
  • Patent number: 8879933
    Abstract: An image formation apparatus includes an exposure unit to form an electrostatic latent image with image dots on a rotatable image carrier by exposing the image carrier to irradiation light, a development unit to form a developer image by attaching a developer to the electrostatic latent image, a voltage supply unit to supply the development unit with a development voltage, a cleaning unit to clean up the developer left on the image carrier after the development, and a developer discard amount controller to control an amount of the developer to be forcibly attached to the image carrier based on a total rotation number of the image carrier if the number of image dots printed during a prescribed number of rotations of the image carrier is smaller than a reference value, and to forcibly attach the controlled amount of the developer to the image carrier to discard the developer.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: November 4, 2014
    Assignee: Oki Data Corporation
    Inventor: Susumu Yamamoto
  • Publication number: 20140314432
    Abstract: In an image forming apparatus, in the case where a time necessary for a developer bearing member to rotate from a measurement position where an attracting unit attracts the toner on the developer bearing member to a developing position at which an electrostatic latent image on the photosensitive member is developed by a toner on the developer bearing member is represented by a time Tqcm, a time necessary for the photosensitive member to rotate from an exposure position at which an exposure unit exposes the photosensitive member to the developing position is represented by a time Tetd, and a time necessary for a control unit to control an exposing condition based on a charge amount measured by a measuring unit is represented by a time Tp, the attracting unit is disposed so that Tqcm?Tedt+Tp holds true.
    Type: Application
    Filed: April 15, 2014
    Publication date: October 23, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Megumi Uchino, Yoshihiro Shigemura, Shingo Horita, Masaaki Naoi, Mineto Yagyu
  • Patent number: 8849149
    Abstract: An image forming apparatus includes temperature sensors that measure temperatures at different locations in the longitudinal direction of a photosensitive drum. The image forming apparatus also includes an image processing circuit configured to change an exposure condition in the longitudinal direction of the photosensitive drum based on measured values obtained by the temperature sensors. A related image forming method includes calculating a temperature at a third location between the first and second location based on the measured temperatures at the first location and the second location, and controlling an exposure condition for exposure at the third location in accordance with image information, including changing the exposure condition for the exposure at the third location based on the calculated temperature at the third location.
    Type: Grant
    Filed: January 14, 2013
    Date of Patent: September 30, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Isami Itoh