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| Number | Title | Issue Date |
| 8189027 | Exposure unit, image forming apparatus and image forming method An exposure unit which exposes photoconductive drums having rotary axes thereof arranged parallel to each other on a single plane by light beams, includes one or more polygon mirrors each having a plurality of reflection surfaces, where the one or more polygon mirro... | 05/29/2012 |
| 8144180 | Optical scanning apparatus and image forming apparatus including the same An optical scanning apparatus includes a light source configured to emit a light beam, a rotational polygonal mirror configured to deflect and scan the light beam emitted from the light source, a drive unit configured to drive the rotational polygonal mirror to rota... | 03/27/2012 |
| 8115795 | Two-dimensional ROS emitter geometry with low banding sensitivity An optical scanning device projects an image onto a photoreceptor within a print system. A laser light source generates a plurality of light beam outputs, wherein the light beam outputs are arranged in a two-dimensional parallelogram array within a substantially hor... | 02/14/2012 |
| 8115794 | Optical scanning device and image forming apparatus In an optical scanning device, when pixel density is taken to be n, number of the light beams is taken to be b, and number of the deflection surfaces of a deflecting unit is taken to be p, a spatial frequency S denoted by S=1/(1/(25.4/n×b×p) is within a range of a... | 02/14/2012 |
| 8111278 | Image forming apparatus, control method thereof and program thereof An image forming apparatus which performs an exposure of a plurality of line images concurrently, by scanning an image carrier with a plurality of light beams in a main scanning direction and simultaneously drives the image carrier in a sub scanning direction, the i... | 02/07/2012 |
| 8085456 | Scanning optical system An object of the present invention is to provide a scanning optical system capable of reducing the number of its components and its size with a simple construction, and an image forming apparatus using the scanning optical system. In a specific scanning optical syst... | 12/27/2011 |
| 8026940 | Image forming apparatus A CPU (91) of an image forming apparatus includes a beam detecting part (911) that detects each of laser beams scanning by a predetermined number (e.g., four) of polygon mirrors (332) at a preset position (where a beam sensor (335) is dis... | 09/27/2011 |
| 8026941 | Light scanning unit and image forming apparatus comprising the same A light scanning unit includes: a light source unit; a polygon mirror for deflecting and scanning light emitted from the light source unit, in a main scanning direction, and having a plurality of deflection surfaces and a plurality of edges at which adjacent deflect... | 09/27/2011 |
| 7995089 | Motor polygon assembly (MPA) facet reflectivity mapping A technique for minimizing motor polygon assembly output reflectivity using real time facet reflectivity measurements and mapping. An automatic power control sensor manages laser beams produced by the laser source associated with the system during overscan periods â... | 08/09/2011 |
| 7952604 | Image forming apparatus An image forming apparatus capable of shortening first copy time to thereby reduce wait time before execution of a print job and prolonging the service life of a scanner motor at the same time. An image forming apparatus that forms a latent image on a photosensitive... | 05/31/2011 |
| 7898709 | Optical scan apparatus, image formation apparatus, optical deflector manufacturing method, polygon mirror processing method, and polygon mirror processing apparatus In the optical deflector, the mean width of profile elements of a cross section of the deflection surface in the sub scan direction is set to be less than the spacing between spots of the light beams formed in the sub scan direction of the deflection surface. This m... | 03/01/2011 |
| 7889224 | Optical path switching device, optical scanning device, and image forming apparatus A disclosed optical path switching device includes a polarization bistable VCSEL that emits a beam having a rising polarization plane, a laser light source configured to emit a beam having a polarization plane orthogonal to the rising polarization plane, and an opti... | 02/15/2011 |
| 7804515 | Image-forming device with scanner unit An image-forming device includes: a housing; an endless belt; a plurality of process units; and a plurality of scanner units. Each scanner unit and each process unit are inclined obliquely to a vertical direction. At least a part of each process unit is inserted int... | 09/28/2010 |
| 7791636 | Scanning optical module and image forming apparatus equipped therewith Disclosed is a scanning optical module, which includes a light source, a rotatable multifaceted mirror adapted to scanningly deflect a scanning beam emitted from the light source, in a given direction, a driving device adapted to drivingly rotate the rotatable multi... | 09/07/2010 |
| 7746372 | Beam deflector, light scanning unit and image forming apparatus having the same A beam deflector having a base, the beam deflector including a polygon mirror to reflect a light beam, a mirror driving unit including a rotor shaft erected from the base and a rotor to support the polygon mirror and to rotate about the rotor shaft, a friction membe... | 06/29/2010 |
| 7688342 | Image forming apparatus and control method thereof An image forming apparatus includes a photosensitive member, a light source for which intervals between spots formed on the photosensitive member by respective beams emitted from a plurality of light-emitting portions are narrower than a predetermined resolution, an... | 03/30/2010 |
| 7684099 | Optical scanning device and image forming apparatus In an optical scanning device, a rotational axis of a first rotary polygon mirror and a rotational axis of a second rotary polygon mirror are inclined toward the same side with respect to a direction perpendicular to a reference plane inclusive of each of center axe... | 03/23/2010 |
| 7671884 | Rotary drive apparatus, optical scan apparatus, and image formation apparatus A rotary drive apparatus includes a rotary body with a support portion, a rotor magnet supported by the support portion of the rotary body, a fixation section facing the rotor magnet and rotatably supporting the rotary body, and a winding coil provided in the fixati... | 03/02/2010 |
| 7599105 | Optical scanning device and image forming apparatus wherein the position of the rotational axis of the oscillating mirror is fixed in the plane orthogonal to the torsion beam such that the rotational axis of the oscillating mirror meets the intersection point of a light beam from a light source unit and a light axis of the focusing optical system A disclosed optical scanning device includes an oscillating mirror supported by a torsion beam for deflecting light beams from a light source unit to scan an object surface backward and forward. A window member transmits light beams incident on and reflected from an... | 10/06/2009 |
| 7542065 | Light beam scanning apparatus and controlling method for image forming apparatus A light beam scanning apparatus that causes a beam generated by a light source to scan corresponding to recording direction along a photosensitive medium by rotating polygonal mirrors, wherein to form a latent image on the photosensitive medium, comprising a first p... | 06/02/2009 |
| 7450145 | Light beam scanner A light beam scanner switches between a first mode in which a laser is turned ON to emit a light beam every surface period of a rotary polygon to detect the light beam, and a second mode in which the laser is turned ON to emit the light beam with a long period speci... | 11/11/2008 |
| 7428089 | Optical scanning device and image forming apparatus An optical scanning device includes a light source that emits a light beam, an optical deflector at which a light beam emitted from the light source is incident, the optical deflector deflecting the incident light beam, an optical system that guides the deflected li... | 09/23/2008 |
| 7417661 | Image forming apparatus and program product optimizing scanner motor operation An image forming apparatus including: a speed information detection unit detecting speed information corresponding to a rotational speed of a scanner motor; a first judgment unit judging if the scanner motor has arrived at a first reference speed being lower than a ... | 08/26/2008 |
| 7414239 | Optical-scanning apparatus and image forming apparatus An optical-scanning apparatus is disclosed. In at least one embodiment, the optical-scanning apparatus includes a light deflector to deflect a beam from a light source; and an optical housing including a scanning-image optical system to focus the beam to scan a phot... | 08/19/2008 |
| 7400338 | Image forming apparatus with temperature detection An image forming apparatus including: an optical scanning unit for deflecting and scanning a light on a photosensitive body, the optical scanning unit having: a light source for emitting the light; a deflection section that deflects the emitted light; a driving sect... | 07/15/2008 |
| 7372479 | Apparatus and method for optical image formation control An image forming apparatus for forming images with an electrophotographic system. The image forming apparatus includes a laser drive unit configured to control a laser light, and an image data transfer control unit configured to control image data from to the laser ... | 05/13/2008 |
| 7365765 | Apparatus for forming image and method of controlling same apparatus in self-diagnostic manner An apparatus for forming an image is disclosed which includes a scanner motor rotatably driving a polygon mirror; a laser light emitter emitting laser light; a generator detecting the laser light reflected off from the polygon mirror, thereby generating a first peri... | 04/29/2008 |
| 7365764 | Scanning optical apparatus and color image forming apparatus using the same A scanning optical apparatus includes a light source capable of being modulated, a deflecting element for deflecting and scanning a beam emitted from the light source, a scanning optical element for imaging the deflected beam into a spot shape on a scanned surface, ... | 04/29/2008 |
| 7355756 | Color electrophotographic apparatus and method of processing an image produced thereby An image reproduction engine which causes toner to adhere to a development region of certain area located at a certain position within dots according to image reproduction data is utilized for image processing, wherein a halftone is expressed by means of halftone sp... | 04/08/2008 |
| 7355773 | Optical scanning apparatus and image forming apparatus using same An optical scanning apparatus includes a light source device, a rotating polygon mirror, a first optical system, and a second optical system. The light source device has at least one light emitter. The first optical system can cause a light beam emitted from the lig... | 04/08/2008 |
| 7348549 | Light scanning apparatus Provided is a light scanning apparatus, including a light source, a light source controller to control an on/off operation of the light source, a light deflector deflecting light emitted from the light source, an image formation optical system to direct light deflec... | 03/25/2008 |
| 7300157 | Pixel-shifting projection lens assembly to provide optical interlacing for increased addressability A projection display system includes a projection lens assembly that has multiple projection lens elements that are configured to receive light imparted with display information by a pixelated display device. The projection lens elements project the light toward a d... | 11/27/2007 |
| 7280127 | Scanning apparatus for laser printer The present invention relates to a scanning apparatus for a laser printer. More particularly, the present invention relates to a scanning apparatus, which is formed to allow a light modulator to be non-perpendicular to the shaft of a photosensitive drum, which is a ... | 10/09/2007 |
| 7268798 | Image forming apparatus which executes an image quality control The present invention uses a pattern that enables image quality maintaining control to be performed at a resolution lower than that used for a normal image forming process. Thus, during an initial operation upon power-on, the image quality maintaining control is per... | 09/11/2007 |
| 7265886 | Optical scanner and image forming apparatus The over-field type optical scanner includes a first imaging optical system disposed between a light source and a rotating polygon mirror for forming, on one surface of the rotating polygon mirror, a linear image with a width larger than a width along a main scannin... | 09/04/2007 |
| 7262896 | Polygonal mirror unit, light scanning unit, and image forming apparatus employing the same A polygonal mirror unit is adapted to prevent contamination using a photocatalyst, a light scanning unit, and an image forming apparatus employing the polygonal mirror. The polygonal mirror unit is designed to prevent contamination of organic materials on a reflecti... | 08/28/2007 |
| 7256918 | Optical scanning device and image forming apparatus incorporating the same In order to determine an arrangement of an optical scanning device provided with a rotary polygon mirror having a plurality of reflective faces, it is determined a direction of polarization of light which is to be made incident on one of the reflective faces and to ... | 08/14/2007 |
| 7253830 | Rotary apparatus including a rotation shaft and sleeve having tapped portions, and laser beam printer having the same A rotary apparatus for a polygon mirror has: a sleeve; a rotation shaft which is inserted into the sleeve; the polygon mirror which is fixed to the rotation shaft; a yoke which is fixed to the rotation shaft; permanent magnets which are fixed to the yoke; and a stat... | 08/07/2007 |
| 7248276 | Image-forming device A motor drive device for driving of a plurality of motors in a proper manner, having a first motor, a second motor, and a current controller. The first motor is able to drive at up to a first maximum permissible current of A1. The second motor is able to driv... | 07/24/2007 |
| 7230638 | Image forming apparatus having a plurality of laser scanner units An image forming device, characterized in that the shape of the optical path of a third laser beam from a third semiconductor laser (19M) to a third photo-sensitive member drum (IM) is approximately the same as that of the optical path of a first laser beam f... | 06/12/2007 |
