Exposure Or Charging (e.g., Fatigue Treatment) Patents (Class 399/128)
  • Patent number: 8712289
    Abstract: A light irradiation element includes a cavity through which light passes and a translucent light conduit bordering the cavity, allowing light to pass therethrough and transmitting the light passed through the cavity, the light irradiation element being disposed along a longitudinal direction of an image bearing body on which an electrostatic latent image is formed and directing the light passed through the light conduit to irradiate the image bearing body.
    Type: Grant
    Filed: June 12, 2012
    Date of Patent: April 29, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Ichirou Kawahara, Masaki Suto, Hiroshi Shokaku
  • Publication number: 20140093264
    Abstract: An image forming apparatus includes a charging member for charging a surface of a photosensitive member to a first potential, an exposing member for partially exposing the charged surface of the photosensitive member such that a potential of the exposed portions becomes a second potential smaller than the first potential, a developer carrier for feeding developer onto the photosensitive member, a discharging-beam member for irradiating a discharging beam onto the photosensitive member having a developer image, and a control device configured to: control a developing bias to become a third potential larger than the second potential and smaller than the first potential; and control a discharging bias such that a potential of portions on the photosensitive member where the developer image has not been formed becomes a fourth potential not smaller than the third potential and smaller than the first potential.
    Type: Application
    Filed: September 27, 2013
    Publication date: April 3, 2014
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventor: Yuichi Matsushita
  • Patent number: 8682220
    Abstract: An image forming apparatus (1) forms a toner image by using toner which includes external additives to develop a latent image which is formed via charging and exposure on a surface of a photosensitive drum (18), and transfers the toner image onto a transfer material, and includes: a static elimination unit (19) that irradiates static elimination light onto the surface of the photosensitive drum before the surface of the photosensitive drum is charged, and removes any charge remaining on the surface of the photosensitive drum after it has completed the transfer; and a static elimination intensity adjustment device (74) that, compared with inner side areas of the paper feed width, lessens the amount of static elimination light irradiated onto areas which, when viewed in the direction of the rotation axis of the photosensitive drum, are on an outer side of the paper feed width and are also on an inner side of the developing width.
    Type: Grant
    Filed: October 19, 2010
    Date of Patent: March 25, 2014
    Assignee: Kyocera Document Solutions Inc.
    Inventor: Shinki Miyaji
  • Publication number: 20140079419
    Abstract: An image forming apparatus includes an image forming unit, a charging bias application section, a static eliminating bias application section, and a control section. In the case where the image forming unit causes an image carrier to be rotated without forming an electrostatic latent image on the image carrier, the control section performs a bias control to allow the charging bias application section to apply to a charging section a smaller charging bias than used in forming a toner image and allow the static eliminating bias application section to apply to a static eliminating section a smaller static eliminating bias than used in forming the toner image. The control section performs the bias control to increase respective values of the charging bias and the static eliminating bias every one revolution of the image carrier until the charging bias and the static eliminating bias in forming the toner image are reached.
    Type: Application
    Filed: September 13, 2013
    Publication date: March 20, 2014
    Applicant: KYOCERA Document Solutions Inc.
    Inventor: Hiroka Itani
  • Patent number: 8660464
    Abstract: An image-forming apparatus is equipped with a neutralization light source that is disposed between a primary transfer position and the cleaning unit, in a direction of rotation of the first image carrier that composes the image-forming unit; irradiates a first neutralization light from a position opposing the primary transfer position on a first image carrier up to a position opposing the cleaning unit; and irradiates a second neutralization light from a position opposing the developer unit for a second image carrier that composes an image-forming unit disposed adjacent to the image-forming unit at a downstream side in the direction of transfer belt rotation, up to a position opposite the primary transfer position.
    Type: Grant
    Filed: April 8, 2011
    Date of Patent: February 25, 2014
    Assignee: Kyocera Document Solutions Inc.
    Inventors: Masahito Ishino, Masaki Kadota, Akane Tokushige
  • Publication number: 20140029964
    Abstract: An image forming apparatus includes a plurality of image forming units, an endless transfer belt, and a plurality of transfer rollers. Each image forming unit includes a photosensitive drum, a charging unit, a developing unit, and a static remover. The static remover emits charge-removing light to the circumferential surface of the photosensitive drum included in the image forming unit before a transfer to the circumferential surface is performed. The amount of pre-transfer charge-removing light emitted to the circumferential surface of a photosensitive drum by one static remover included in the plurality of image forming units is set to a value less than the amount of pre-transfer charge-removing light emitted to the circumferential surface of another photosensitive drum by another static remover located upstream of the one static remover in the movement direction of an intermediate transfer belt.
    Type: Application
    Filed: July 29, 2013
    Publication date: January 30, 2014
    Applicant: Kyocera Document Solutions Inc.
    Inventor: Teppei Shibuya
  • Patent number: 8611769
    Abstract: This disclosure provides methods and systems for troubleshooting charging and photoreceptor failure modes associated with a xerographic process. Specifically, according to an exemplary method the photoreceptor decay behavior, with and without the effects of depletion, are quantified and used to determine a performance state of one or more of the charging stations and the photoreceptor surface.
    Type: Grant
    Filed: November 22, 2011
    Date of Patent: December 17, 2013
    Assignee: Xerox Corporation
    Inventors: Aaron Michael Burry, Surendar Jeyadev, Palghat S. Ramesh, Eric Scott Hamby, Vladimir Kozitsky, Gary Walker Skinner
  • Patent number: 8600265
    Abstract: An image forming apparatus includes a photosensitive member; a charging device for electrically charging the photosensitive member; an exposure device for exposing to light the photosensitive member charged by the charging device to form an electrostatic image on the photosensitive member; a developing device for developing the electrostatic image on the photosensitive member with toner to form a toner image; a transfer portion for transferring the toner image from the photosensitive member onto an image receiving member; a toner charging portion, disposed upstream of the charging device and downstream of the transfer portion with respect to a rotational direction of the photosensitive member, for electrically charging the toner remaining on the photosensitive member without being transferred onto the image receiving member; and control portion for controlling the charging device and the exposure device so that a stripe-shaped electrostatic image is repeatedly formed in substantially parallel to a longitudina
    Type: Grant
    Filed: November 15, 2010
    Date of Patent: December 3, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Jiro Kinokuni, Michihiro Yoshida
  • Publication number: 20130315626
    Abstract: A static eliminating device includes: a housing; a substrate mounted to the housing; a light-emitting part mounted on a mounting surface of the substrate; a partition member connected to the housing to cover the substrate and the light-emitting part and face a portion of the housing to which the substrate and the light-emitting part are mounted so that an opening facing the surface of the image carrier is formed in a light-emitting region across which light is delivered from the light-emitting part to the surface of the image carrier; and a restricting protrusion abutting at a distal end thereof against the partition member to support the partition member and restricting the position of the partition member to ensure the formation of the opening. A distal side portion of the restricting protrusion located within the light-emitting region has a tapered shape narrowing with approach toward the partition member.
    Type: Application
    Filed: May 20, 2013
    Publication date: November 28, 2013
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Jun Nakai, Katsuya Ota
  • Publication number: 20130308977
    Abstract: An image forming apparatus includes a housing with an inner space, a photosensitive drum, a drum unit, a rail member, and a static eliminator. The photosensitive drum includes a rotating shaft, and a circumferential surface to be drivingly rotated around the rotating shaft for carrying an image thereon. The drum unit is inserted in the inner space of the housing along an axis direction of the rotating shaft in a state that the photosensitive drum is integrally supported to be mounted in the inner space. The rail member extends along the axis direction in the inner space for guiding the drum unit in the axis direction when the drum unit is mounted. The static eliminator is fixed to the rail member, and disposed to face the photosensitive drum in the drum unit mounted in the inner space for irradiating the circumferential surface of the photosensitive drum with static eliminating light.
    Type: Application
    Filed: May 14, 2013
    Publication date: November 21, 2013
    Applicant: KYOCERA Document Solutions Inc.
    Inventor: Hirokazu Fujii
  • Patent number: 8588650
    Abstract: Two thick film charging devices or a common thick film charge device with two separated obverse conductors, sharing a common power supply are used for photoreceptor charge and erase. The thick film charging devices use a set of AC biased electrodes supported on a dielectric material which also support a counter electrode on an opposite side of the dielectric. A DC offset applied to the counter electrodes is used to set photoreceptor charge level. One DC voltage is used for photoreceptor charge and a zero or near zero DC voltage is used to erase residual charge for the photoreceptor.
    Type: Grant
    Filed: June 15, 2011
    Date of Patent: November 19, 2013
    Assignee: Xerox Corporation
    Inventors: Gerald F Daloia, Michael A Doody
  • Patent number: 8571429
    Abstract: An image forming apparatus has first and second image carriers that are configured by positively-charged single layer type electrophotographic photoreceptors, and a controller that controls an operation for charging or destaticizing circumferential surfaces of these image carriers. The controller switches between a first mode for causing the first and second image carriers to perform image formation while rotating these image carriers, and a second mode for causing only the first image carrier to perform image formation while rotating the first and second image carriers. In the second mode, the second image carrier is applied with a charging bias and subjected to a destaticizing operation without undergoing a developing operation. The first image carrier is applied with the charging bias and subjected to the developing operation and the destaticizing operation.
    Type: Grant
    Filed: May 31, 2011
    Date of Patent: October 29, 2013
    Assignee: Kyocera Mita Corporation
    Inventors: Masaki Kadota, Shinki Miyaji, Masahito Ishino, Yoshitaka Imanaka, Hiroka Itani
  • Patent number: 8571444
    Abstract: A neutralization device includes a light emitter, an optical conductor and multiple diffusion portions. The light emitter emits light for neutralizing an object. The optical conductor, which is opposed to the object and extends in a longitudinal direction, directs and applies the light to the object. The diffusion portions are arranged on the optical conductor in a zig-zag manner from one end of the optical conductor to the other and diffuse the light.
    Type: Grant
    Filed: November 18, 2010
    Date of Patent: October 29, 2013
    Assignee: Oki Data Corporation
    Inventors: Yukiyoshi Oda, Akihiro Yamamura, Masahiro Kawano, Ken Nozawa, Toshiharu Sato
  • Patent number: 8543023
    Abstract: A color electrophotographic image forming apparatus includes a supporting member that supports a plurality of electrophotographic photosensitive drums and is movable between an image forming position and a retracted position, a driving unit for driving the electrophotographic photosensitive drums, an intermediary transfer belt onto which images formed by developing the electrostatic latent images formed on the electrophotographic photosensitive drums are transferred, and a controller for controlling execution of image formation. The controller controls the image formation so as to provide, on the electrophotographic photosensitive drums, areas having a lowered absolute value of surface potential, and so as to stop driving of the electrophotographic photosensitive drums by the driving unit in a state that the areas are opposed to the intermediary transfer belt.
    Type: Grant
    Filed: February 28, 2013
    Date of Patent: September 24, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kazuhiro Hosohara, Toshiyuki Watanabe
  • Patent number: 8538294
    Abstract: In the charge-removing device, the light guide portion extends in a first direction. The light guide portion guides light from the light source toward the surface of the image-bearing member. A charge on the surface of the image-bearing member is removed by the light emitted from the light guide portion. The first surface of the light guide portion opposes the light source. The rear surface is an opposite surface of the confronting surface and has a rough surface part that reflects, toward the confronting surface, the light from the first surface. The closer a position of the increasing portion is to the second surface, the larger the length of the increasing portion becomes. The closer a position of the decreasing portion is to the second surface, the smaller the length of the decreasing portion becomes.
    Type: Grant
    Filed: March 18, 2011
    Date of Patent: September 17, 2013
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Yukiko Takami, Takashi Shimizu, Junichi Hashimoto
  • Publication number: 20130195507
    Abstract: An image forming apparatus has an intermediate transfer belt and a plurality of image forming units located along the intermediate transfer belt. Each image forming unit has a photosensitive drum, a charger that charges the photosensitive drum, a developing device that forms a toner image by attaching toner to an electrostatic latent image formed by exposure after charging, a transfer device that transfers the toner image formed on the photosensitive drum to the intermediate transfer belt, a cleaning device that removes toner remaining on the photosensitive drum, and a neutralization device that neutralizes the photosensitive drum using neutralization light. The neutralization device of at least one of the image forming units irradiates the photosensitive drum with neutralization light, irradiates the intermediate transfer belt with neutralization light, and irradiates the photosensitive drum of the adjacent image forming unit with reflected light of neutralization light from the intermediate transfer belt.
    Type: Application
    Filed: January 30, 2013
    Publication date: August 1, 2013
    Applicant: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventor: KYOCERA DOCUMENT SOLUTIONS INC.
  • Publication number: 20130195488
    Abstract: The cleaning unit cleans the surface of the image carrying body after transfer of the toner image onto an image transfer object. The post-transfer neutralization unit is disposed between the transfer unit and the cleaning unit, and neutralizes electrical charge of the surface of the image carrying body after transfer. The first control unit controls neutralization light intensity of the pre-transfer neutralization unit such that a dark potential (V0 potential) of a non-image region on the image carrying body after pre-transfer neutralization is higher by 50 to 150 V than a bright potential (VL potential) of a solid image region. The first setting operating unit allows for an increase and decrease in the neutralization light intensity of the pre-transfer neutralization unit based on a status of an output image.
    Type: Application
    Filed: January 29, 2013
    Publication date: August 1, 2013
    Applicant: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventor: KYOCERA Document Solutions Inc.
  • Patent number: 8472834
    Abstract: An image forming apparatus includes an image carrier, a developing device that forms a toner image on the surface of the image carrier, a transfer unit that transfers the toner image formed on the image carrier onto a transfer material such as paper, a neutralizing unit that neutralizes an electrostatic latent image on the surface of the image carrier by light radiation, a cleaning unit that cleans toner remaining on the surface of the image carrier after the toner image is transferred. The image carrier, the developing device, the transfer unit, the neutralizing unit, and the cleaning unit are provided to the main body of the image forming apparatus. The image forming apparatus further includes a withdrawal mechanism that withdraws at least the image carrier, the cleaning unit, and the neutralizing unit integrally from the main body of the image forming apparatus.
    Type: Grant
    Filed: September 17, 2010
    Date of Patent: June 25, 2013
    Assignee: Ricoh Company, Limited
    Inventor: Toshiya Satoh
  • Publication number: 20130156465
    Abstract: The light emitting portions 140 are mounted on the substrate 120, and emit neutralization light. The first end engagement portion 115 is engaged with the first end portion 121 of the substrate 120 opposite to the image carrier 2. The partitioning member 130 is connected to the housing 110, so as to form an opened portion that is opened to face the surface of the image carrier 2. The plurality of restriction protrusions 150 are arranged along an axial direction of the image carrier 2. The first end engagement portion 115 is disposed in the central portion of the plurality of restriction protrusions 150 in the arrangement direction. The arrangement direction of the plurality of restriction protrusions 150 curves, such that a central portion of the restriction protrusions in the axial direction is closer to the image carrier than end portions of the restriction protrusions in the axial direction.
    Type: Application
    Filed: December 11, 2012
    Publication date: June 20, 2013
    Applicant: KYOCERA Document Solutions Inc.
    Inventor: KYOCERA Document Solutions Inc.
  • Publication number: 20130149006
    Abstract: Disclosed is an image forming apparatus, including: a main body; an image carrying body disposed in the main body, a transfer unit and an electrical charge removal unit. The image forming apparatus forms a visible image on the image carrying body by carrying out charging, exposing and developing processes. The transfer unit transfers the visible image from the image carrying body to a printing medium. The electrical charge removal unit is configured to remove the residual electrical charge from the printing medium, and is movable, in cooperation with at least one replaceable component part of the transfer unit, between an operable position at which the electrical charge removal unit is capable of removing the electrical charge from the printing medium and a non-interfering position at which the electrical charge removal unit does not interfere with the movement of the at least one replaceable component part of the transfer unit being received into or being removed from the main body for replacement.
    Type: Application
    Filed: February 7, 2013
    Publication date: June 13, 2013
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Jun-Ho LEE, Jeong-Yong JU
  • Publication number: 20130136499
    Abstract: The neutralization units 12a and 12b are arranged between the primary transfer positions and the cleaning units 11a and 11b, and, irradiate a region on the image supporting body 2a with first neutralization light 131, the regions spanning from a position facing the primary transfer position to a position facing the cleaning unit 11a. The neutralization units 12a and 12b irradiate a region on the image supporting body 2b with second neutralization light 132, the region spanning from a position facing the developing unit 16b to a position facing the primary transfer position. The neutralization units 12a and 12b include a first reflective part and a second reflective part provided at different positions on a side face of the light guiding body. The first reflective part forms the light 131 and the second reflective part forms the light 132 by reflecting the light from the neutralization light source.
    Type: Application
    Filed: November 21, 2012
    Publication date: May 30, 2013
    Applicant: KYOCERA Document Solutions Inc.
    Inventor: KYOCERA Document Solutions Inc.
  • Publication number: 20130101313
    Abstract: An image forming apparatus includes a photosensitive body carrying an electrostatic latent image on a surface thereof, a charge device charging the surface of the photosensitive body, an exposure device forming the electrostatic latent image on the photosensitive body, a development device developing the electrostatic latent image so that a developer image is formed, and a transfer device transferring the developer image on a print medium. Wherein, a positive charge dark decay rate of the photosensitive body is greater than a negative charge dark decay rate when a dark decay rate is expressed by ? V ? ? 0 ? - ? V ? ? 5 ? ? V ? ? 0 ? × 100 ? ( % ) where V0 [V] is a surface potential of the photosensitive body immediately after a completion of the charging by the charge device, and V5 [V] is the surface potential when the photosensitive body is left in a dark place for 5 seconds immediately after the completion of the charging.
    Type: Application
    Filed: October 11, 2012
    Publication date: April 25, 2013
    Applicant: OKi Data Corporation
    Inventor: Oki Data Corporation
  • Patent number: 8428477
    Abstract: An image forming apparatus includes a toner carrying member for supplying toner to an image bearing member to visualize the latent image; a rotatable toner supply member, contacted to the toner carrying member, for supplying toner to the image bearing member; a voltage applying device for applying voltages to the toner carrying member and the toner supply member; and a controller for controlling the voltage applying device to control voltages applied to the toner carrying member and the toner supplying member.
    Type: Grant
    Filed: June 1, 2010
    Date of Patent: April 23, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masahiro Shibata, Masahiro Yoshida, Kazunori Hashimoto, Kazuhiro Okubo, Hisashi Yamauchi
  • Patent number: 8417134
    Abstract: A color electrophotographic image forming apparatus, in which a plurality of cartridges each including an electrophotographic photosensitive drum are detachably mountable to a main assembly of the apparatus, includes an exposure device for forming an electrostatic latent image on the drum; a cartridge supporting member capable of demountably supporting the cartridges and movable between an inside position and an outside position; a driving device for driving the drum; an intermediary transfer belt onto which an image provided by developing the electrostatic latent image formed on the drum is transferred; and a controller for controlling execution of image formation in response to print jobs received by the apparatus. The controller causes the exposure device to expose the drum to light after completion of a last print job, and the controller stops drive of the drum by the driving device in a state that the exposed area is opposed to the intermediary transfer belt.
    Type: Grant
    Filed: June 17, 2010
    Date of Patent: April 9, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kazuhiro Hosohara, Toshiyuki Watanabe
  • Patent number: 8417153
    Abstract: Disclosed are a light guide member, a charge eliminating unit and an image forming apparatus and/or an image reading apparatus having the same. The light guide member may include an incidence face through which light is introduced, an irregular reflection portion arranged along a longitudinal direction of the light guide member for irregular reflection of the light introduced through the incidence face and an emission face arranged opposite the irregular reflection portion for emission of the light. At least one recess may be formed in the incidence face for diffusion of the light introduced through the incidence face.
    Type: Grant
    Filed: May 13, 2011
    Date of Patent: April 9, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Kyung Rok Kim, Yong Geun Kim, Hyun Surk Kim
  • Patent number: 8412064
    Abstract: An image forming apparatus includes a rotatable photosensitive member, a charging member, an applying device, an irradiation device, and a controller. The charging member contacts the photosensitive member to charge the photosensitive member. The applying device applies a direct-current voltage to the charging member. The irradiation device irradiates with light an upstream charging gap located upstream of a contact portion between the photosensitive member and the charging member in a rotation direction of the photosensitive member. The controller controls the irradiation device to irradiate with a first light amount when the photosensitive member rotates at a first speed, and to irradiate with a second light amount that is larger than the first light amount when the photosensitive member rotates at a second speed that is lower than the first speed.
    Type: Grant
    Filed: September 3, 2010
    Date of Patent: April 2, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventor: Kenichi Shibuya
  • Patent number: 8391749
    Abstract: Electric charge remaining on a photoreceptor after transfer causes image deterioration. According to one conventional method widely used in view of this problem, erase light is emitted onto a photoreceptor after the transfer to remove the electric charge remaining on the photoreceptor. However, such a method poses the following problem: emission of erase light leads to light-induced fatigue of the photoreceptor, and as a result, the photoreceptor which has deteriorated from the light-induced fatigue wears down due to abrasion and the like with a cleaner blade, resulting in a shorter lifetime of the photoreceptor. Thus, the thickness of the photosensitive layer is detected to acquire the amount of thickness decrease, and the amount of the erase light is reduced according to the acquired amount of thickness decrease.
    Type: Grant
    Filed: March 17, 2010
    Date of Patent: March 5, 2013
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventor: Keisuke Inoue
  • Publication number: 20130051855
    Abstract: An image formation apparatus includes a photoreceptor, a charge unit, an exposure unit, a development unit, and a transfer unit. The photoreceptor satisfies the following formulas. 0.9?(|V0(2)?VL|)/(|V0(1)?VL|)?1.0 2.0?|VL|/L?3.5 VL denotes a post-exposure surface potential value [V] of a surface portion of the photoreceptor exposed by the exposure unit in a first image formation cycle; V0(2) denotes a charge potential value [V] in a second image formation cycle of a surface portion of the photoreceptor exposed by the exposure unit in the first image formation cycle; V0(1) denotes a charge potential value [V] in a second image formation cycle of a surface portion of the photoreceptor not exposed by the exposure unit in the first image formation cycle; and L denotes a film thickness [?m] of the photosensitive layer.
    Type: Application
    Filed: August 24, 2012
    Publication date: February 28, 2013
    Applicant: OKI DATA CORPORATION
    Inventor: Mikio MOTOMURA
  • Publication number: 20130045027
    Abstract: Apparatus for electrically reconditioning a rotatable photoreceptor in an electrophotographic (EP) printer includes a charger, an exposure subsystem, a transfer station, and an erase lamp arranged in that order around the photoreceptor in the direction of rotation thereof. A first corona electrode is disposed within 3 cm of the surface of the photoreceptor, but not in contact therewith, between the transfer station and the erase lamp. The transfer station and the erase lamp are at most 1 cm apart. A second corona electrode is disposed within 3 cm of the surface of the photoreceptor, but not in contact therewith, after the erase lamp in the direction of rotation of the photoreceptor. The erase lamp and the second corona electrode are less than 1 cm apart.
    Type: Application
    Filed: August 18, 2011
    Publication date: February 21, 2013
    Inventors: Mark Cameron Zaretsky, David Steven Weiss
  • Publication number: 20130045028
    Abstract: An electrophotographic photoreceptor is prepared for charging. Corona electrodes before and after the erase lamp apply respective biases to provide the correct sign of charge for cleaning, and to discharged trapped charges in the photoreceptor. Toner is then cleaned off the photoreceptor. This leaves the photoreceptor electrically and mechanically reconditioned and ready for its next printing cycle.
    Type: Application
    Filed: August 18, 2011
    Publication date: February 21, 2013
    Inventors: Mark Cameron Zaretsky, David Steven Weiss
  • Publication number: 20130004204
    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: June 25, 2012
    Publication date: January 3, 2013
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Hiroshi Hagiwara, Takamitsu Soda, Akinobu Hirayama, Hiromitsu Kumada, Yoshiko Kubo, Takateru Ohkubo
  • Patent number: 8346110
    Abstract: The image forming apparatus includes a photosensitive drum capable of bearing an electrostatic image, a development device having a developing sleeve capable of bearing a developer and a developer container capable of storing a magnetic toner, and a CPU controlling operation to discharge a developer having polarity opposite to a normally charged polarity to the photosensitive drum by enlarging a restoration electric field to force the developer having a normally charged polarity from the photosensitive drum to the development sleeve during image forming is not performed compared to that during normal image forming is performed, based on a weighted value (p×K) on an edge portion pixel number p of an edge portion of an output image.
    Type: Grant
    Filed: August 19, 2010
    Date of Patent: January 1, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventor: Osamu Ariizumi
  • Publication number: 20120328332
    Abstract: An image forming apparatus including an image bearing member, a charger, an irradiator, a developing device, a transfer device, a neutralizer, and a varying device is provided. The neutralizer is adapted to neutralize the image bearing member by emitting neutralization light thereto, after a toner image formed on the image bearing member is transferred therefrom. The varying device is adapted to vary an amount of the neutralization light to be emitted to the image bearing member by pulse-width modulation of a voltage to be supplied to the neutralizer. The image forming apparatus satisfies the following formula: f/V>5 wherein f (Hz) represents a frequency of the pulse-width modulation and V (mm/s) represents a linear speed of the image bearing member.
    Type: Application
    Filed: June 5, 2012
    Publication date: December 27, 2012
    Inventors: Akio KOSUGE, Shinichi Kawahara, Nobuo Kuwabara, Takeshi Shintani, Norio Kudo, Daisuke Tomita
  • Patent number: 8340551
    Abstract: The present invention therefore provides an image forming apparatus, comprising: a photoconductor; a charge means for charging the photoconductor; an exposure means for irradiating a surface of the photoconductor with light to form an electrostatic latent image; a development means for developing the electrostatic latent image formed; a transfer means for transferring the image developed onto a paper sheet; and a discharge means for irradiating the surface of the photoconductor with light to eliminate charges, wherein the photoconductor contains a titanylphthalocyanine having absorption bands in a wavelength region of 380 nm to 420 nm and a wavelength region of 600 nm to 850 nm as a charge generation material, the exposure means irradiates the surface of the photoconductor with light having a wavelength of 380 nm to 420 nm to form the electrostatic latent image, and the discharge means irradiates the surface of the photoconductor with light having a wavelength of 600 nm to 850 nm to eliminate the charges.
    Type: Grant
    Filed: May 19, 2010
    Date of Patent: December 25, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Takayuki Yamanaka, Koichi Toriyama, Kotaro Fukushima, Masanori Matsumoto
  • Publication number: 20120321347
    Abstract: Two thick film charging devices or a common thick film charge device with two separated obverse conductors, sharing a common power supply are used for photoreceptor charge and erase. The thick film charging devices use a set of AC biased electrodes supported on a dielectric material which also support a counter electrode on an opposite side of the dielectric. A DC offset applied to the counter electrodes is used to set photoreceptor charge level. One DC voltage is used for photoreceptor charge and a zero or near zero DC voltage is used to erase residual charge for the photoreceptor.
    Type: Application
    Filed: June 15, 2011
    Publication date: December 20, 2012
    Applicant: XEROX CORPORATION
    Inventors: Gerald F. Daloia, Michael A. Doody
  • Patent number: 8290401
    Abstract: An image forming apparatus includes an image carrying body having a surface on which a toner image is formed. A charger charges the surface body and a charge eliminator removes charge from the surface. The charge eliminator includes light sources to generate charge elimination light and a light guide to guide the charge elimination light onto the surface. The light guide includes a first portion to guide the charge elimination light onto an axial central portion of the image carrying body and a second portion to guide the charge elimination light onto axial end portions of the image carrying body. The second light guide portion allows charge elimination light that is incident on the first light guide portion to travel into the second light guide portion, but restricts charge elimination light that is incident on the second light guide portion from traveling into the first light guide portion.
    Type: Grant
    Filed: July 12, 2010
    Date of Patent: October 16, 2012
    Assignee: Kyocera Mita Corporation
    Inventor: Masahiro Tsutsumi
  • Patent number: 8238792
    Abstract: Disclosed are a charge eliminator and an image forming apparatus having the same. The charge eliminator includes a light source array and a light guide member. The light source array includes a plurality of point light sources. The light guide member includes an incidence face through which light generated from the point light sources is introduced. The light guide member guides the light introduced through the incidence face to the photoconductor. A diffusion pattern is provided at the incidence face of the light guide member to diffuse the light introduced through the incidence face.
    Type: Grant
    Filed: December 15, 2009
    Date of Patent: August 7, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Kyung Rok Kim, Hun Sup Kim, Ki Ju Pak
  • Patent number: 8224207
    Abstract: A light irradiation element includes a cavity through which light passes and a translucent light conduit bordering the cavity, allowing light to pass therethrough and transmitting the light passed through the cavity, the light irradiation element being disposed along a longitudinal direction of an image bearing body on which an electrostatic latent image is formed and directing the light passed through the light conduit to irradiate the image bearing body.
    Type: Grant
    Filed: June 9, 2008
    Date of Patent: July 17, 2012
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Ichirou Kawahara, Masaki Suto, Hiroshi Shokaku
  • Patent number: 8200123
    Abstract: An image forming apparatus is provided with an image bearing member for bearing a toner image while rotating, a toner image forming device for forming the toner image on the image bearing member, a neutralizer for neutralizing electric charges on the image bearing member by irradiating light to the charged image bearing member after the toner image formed on the rotating image bearing member is transferred to a transfer material, and a frame for supporting the neutralizer. A first clearance is present between the neutralizer and the frame.
    Type: Grant
    Filed: August 26, 2009
    Date of Patent: June 12, 2012
    Assignee: Kyocera Mita Corporation
    Inventors: Mitsuhiro Goda, Naoki Yamane
  • Patent number: 8180235
    Abstract: An image forming apparatus has a control unit that outputs the state of a belt member on the basis of the result of detection by a toner image detecting unit, of a toner image formed by a developing unit in a charged region of an image bearing member charged by applying a voltage to a transfer unit without charging the image bearing member using a charging unit.
    Type: Grant
    Filed: October 8, 2009
    Date of Patent: May 15, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yasuhito Shirafuji
  • Patent number: 8107858
    Abstract: A discharger is provided, which can eliminate charge from a surface of a photoconductor. The discharger includes: a light source; a light guide member; a cover which covers the light guide member to expose at least an opposed surface of the light guide member to the photoconductor; and an adhesive tape which uses nonwoven fabric as a substrate, which is disposed between the light guide member and the cover so that the opposed surface of the light guide member is disposed between the tape and the photoconductor, and which bonds the light guide member and the cover to each other.
    Type: Grant
    Filed: March 20, 2009
    Date of Patent: January 31, 2012
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Yasushi Okabe
  • Patent number: 8064799
    Abstract: An electrophotographic image forming apparatus includes a cartridge supporting member movable between an inside position inside the main assembly of the apparatus and an outside position outside the main assembly, a light source, a light guide member, on the cartridge supporting member, for guiding the light from the light source to electrically discharge charge remaining on a drum after a developed image on the drum is transferred onto recording material when the cartridge is in an image forming position, an interrelating member for moving the light source to an operating position where the light enters the light guide member in interrelation with movement of the cartridge supporting member from the outside to the inside positions, and a positioning member positioning the light source at the operating position.
    Type: Grant
    Filed: September 28, 2009
    Date of Patent: November 22, 2011
    Assignee: Canon Kabushiki Kaisha
    Inventors: Noriaki Tanaka, Tsuyoshi Otake
  • Patent number: 8055153
    Abstract: An image forming apparatus includes: an electrophotographic photoreceptor including a conductive support and a photosensitive layer including an outermost surface layer capable of transporting a charge, the layer being farthest from the conductive support and containing a resin having a crosslinking structure; a charging unit that charges the electrophotographic photoreceptor; a first exposure unit that exposes the electrophotographic photoreceptor to form an electrostatic latent image on the electrophotographic photoreceptor charged; a developing unit that develop the electrostatic latent image with a toner to form a toner image; a transfer unit that transfer the toner image from the electrophotographic photoreceptor to a medium to be transferred; and a second exposure unit that uniformly expose the electrophotographic photoreceptor, the outermost surface layer absorbing exposure light of the second exposure unit and having a maximum absorbance of about 0.
    Type: Grant
    Filed: May 23, 2007
    Date of Patent: November 8, 2011
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Katsumi Nukada, Wataru Yamada, Yukiko Furushiro, Takayuki Yamashita
  • Patent number: 8055156
    Abstract: An image-forming apparatus includes an electrophotographic photoreceptor including a photosensitive layer, an exposure unit for irradiating the electrophotographic photoreceptor with light, a pressing member pressed against the photosensitive layer of the electrophotographic photoreceptor to remove a deposit from the photosensitive layer, and a static eliminating unit for eliminating the static electricity of the deposit to be removed by the pressing member.
    Type: Grant
    Filed: September 23, 2008
    Date of Patent: November 8, 2011
    Assignee: Kyocera Corporation
    Inventor: Katsumi Okuda
  • Patent number: 8041261
    Abstract: An image forming apparatus includes a photosensitive body, a light scanning lamp, and a lamp controller. The image forming apparatus has a surface capable of accepting an electric potential. The light scanning lamp can scan a lamp light toward the photosensitive body to change the electric potential of the photosensitive body. The lamp controller moves between a blocking position to block the lamp light from reaching the surface of the photosensitive body, and an unblocking position that is spaced from the blocking position and allows the lamp light to reach the surface of the photosensitive body.
    Type: Grant
    Filed: November 13, 2007
    Date of Patent: October 18, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Ji-won Moon, Hyun-wook Bae
  • Publication number: 20110249987
    Abstract: An image-forming apparatus is equipped with a neutralization light source that is disposed between a primary transfer position and the cleaning unit, in a direction of rotation of the first image carrier that composes the image-forming unit; irradiates a first neutralization light from a position opposing the primary transfer position on a first image carrier up to a position opposing the cleaning unit; and irradiates a second neutralization light from a position opposing the developer unit for a second image carrier that composes an image-forming unit disposed adjacent to the image-forming unit at a downstream side in the direction of transfer belt rotation, up to a position opposite the primary transfer position.
    Type: Application
    Filed: April 8, 2011
    Publication date: October 13, 2011
    Applicant: KYOCERA MITA CORPORATION
    Inventors: Masahito Ishino, Masaki Kadota, Akane Tokushige
  • Publication number: 20110243609
    Abstract: In the charge-removing device, the light guide portion extends in a first direction. The light guide portion guides light from the light source toward the surface of the image-bearing member. A charge on the surface of the image-bearing member is removed by the light emitted from the light guide portion. The first surface of the light guide portion opposes the light source. The rear surface is an opposite surface of the confronting surface and has a rough surface part that reflects, toward the confronting surface, the light from the first surface. The closer a position of the increasing portion is to the second surface, the larger the length of the increasing portion becomes. The closer a position of the decreasing portion is to the second surface, the smaller the length of the decreasing portion becomes.
    Type: Application
    Filed: March 18, 2011
    Publication date: October 6, 2011
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Yukiko TAKAMI, Takashi SHIMIZU, Junichi HASHIMOTO
  • Publication number: 20110217076
    Abstract: Disclosed are a light guide member, a charge eliminating unit and an image forming apparatus and/or an image reading apparatus having the same. The light guide member may include an incidence face through which light is introduced, an irregular reflection portion arranged along a longitudinal direction of the light guide member for irregular reflection of the light introduced through the incidence face and an emission face arranged opposite the irregular reflection portion for emission of the light. At least one recess may be formed in the incidence face for diffusion of the light introduced through the incidence face.
    Type: Application
    Filed: May 13, 2011
    Publication date: September 8, 2011
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Kyung Rok Kim, Yong Geun Kim, Hyun Surk Kim
  • Patent number: 8010018
    Abstract: A discharger is provided, which can eliminate charge from a surface of a photoconductor. The discharger includes: a light source; and a light guide member which extends in a first direction to be opposed to the surface of the photoconductor in a second direction substantially orthogonal to the first direction. The light guide member has a plurality of holes, each defined by a hole surface. At least a portion of the hole surface is curved. The hole extends in an orthogonal direction substantially orthogonal to the first and second directions.
    Type: Grant
    Filed: March 23, 2009
    Date of Patent: August 30, 2011
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Yasushi Okabe
  • Patent number: 8005401
    Abstract: An image forming apparatus may be provided with a belt configured to move in the predetermined direction and face a photoreceptor, a charge removal member, and a conductive member. The charge removal member may be configured to remove charge of the belt. The conductive member may be located at the downstream side of the charge removal member in the predetermined direction. The conductive member may include a surface facing the belt.
    Type: Grant
    Filed: December 23, 2008
    Date of Patent: August 23, 2011
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Toshio Furukawa, Katsuyuki Yokoi, Kensuke Miyahara