Patent application number | Description | Published |
20090021759 | Optical Scanning Device and Printing Apparatus - An optical scanning device includes: an emission unit which emits a light beam; an oscillating mirror which deflects the light beam to reciprocate on a scanning surface; and a controller which controls the emission unit to be on and off to form a pattern of dots in each cell of a plurality of cells defined on the scanning surface, the pattern being formed according to a gradation of the cell and based on a dot-concentrated threshold matrix. The threshold matrix is defined such that the pattern of dots to be formed in the cell includes a plurality of pairs of adjacent dots in a sub-scanning direction. Among the plurality of pairs of adjacent dots to be formed, a number of pairs of adjacent dots which are closer than an interval of adjacent ideal scanning lines is equal to a number of pairs of adjacent dots which are further than the interval. | 01-22-2009 |
20090046342 | Light Scanning Device - A light scanning device includes: a light source which emits light; a frame which supports the light source; an oscillating mirror which rotationally oscillates about a first axis to reflect the light emitted from the light source; a mirror holder which holds the oscillating mirror; a beam member which extends in a first direction orthogonal to the first axis and which is longer than the mirror holder in the first direction; a first fixing member which fixes the mirror holder to the beam member; and a second fixing member which fixes the beam member to the frame. | 02-19-2009 |
20090080039 | Light Scanning Device and Image Apparatus - A light scanning device and an image forming apparatus including the light scanning device are provided. The light scanning device includes: a light emitting unit which emits a light beam; a light deflecting unit which deflects the light beam to scan in a scanning direction; a scanning lens which focuses the light beam deflected and scanned by the light deflecting unit on a photosensitive body; and a light detecting unit which detects the light beam directed to outside areas of an image formation area in the scanning direction, wherein an optical path length of the light beam directed to one of the outside areas, from the light deflecting unit to the light detecting unit is different from an optical path length of the light beam directed to the other one of the outside areas, from the light deflecting unit to the light detecting unit. | 03-26-2009 |
20090116875 | Image Forming Apparatus - An image forming apparatus includes: a photosensitive body which is moved in a movement direction; an exposing unit which exposes the photosensitive body, and which includes a guide roller configured to contact with the photosensitive body and rotate with a movement of the photosensitive body and configured to regulate a positional relationship with the photosensitive body, the guider roller being disposed such that a rotation direction of the guide roller is inclined with respect to the movement direction so as to generate a force for urging the exposing unit to one end thereof in an orthogonal direction when the guide roller rotates, the orthogonal direction being orthogonal to the movement direction and to an optical axis direction of a light emitted from the exposing unit; and a regulating member configured to contact with the one end of the exposing unit to regulate a position of the exposing unit. | 05-07-2009 |
20090162091 | Image Forming Apparatus - An image forming apparatus is provided. The image forming apparatus includes: a photosensitive member on which an electrostatic latent image is to be formed; a first body which rotatably supports the photosensitive member; an exposing unit which exposes the photosensitive member; a second body which supports the exposing unit movably between an exposing position in which the exposing unit exposes the photosensitive member and a retracting position in which the exposing unit is retracted from the photosensitive member; a first grounding unit which, when the exposing unit is positioned at the exposing position, causes the exposing unit to be electrically connected to the first body; and a second grounding unit which, when the exposing unit is positioned at the retracting position, causes the exposing unit to be electrically connected to the first body via the second body. | 06-25-2009 |
20090169228 | Image Forming Apparatus - An image forming apparatus includes: a lower body including a plurality of photosensitive members and having an opening; an upper body which is configured to open and cover the opening; a plurality of exposure units which are supported by the upper body and which are opposed to the photosensitive members when the cover covers the opening; a main substrate provided in the housing; an exposure control substrate which is provided to the upper body and controls light emission of the exposure units; a plurality of first cables which electrically connect the exposure units to the exposure control substrate, respectively, each of the first cables including a plurality of signal lines; and a second cable which electrically connects the exposure control substrate to the main substrate and which includes at least one signal line, a number of which is smaller than a total number of the signal lines included in the first cables. | 07-02-2009 |
20090169260 | Image Forming Apparatus - An image forming apparatus is provided. The image forming apparatus includes: a photosensitive member; an exposing unit which is opposed to the photosensitive member, and which includes a plurality of light emitting elements arranged in an arrangement direction to expose the photosensitive member; and a body frame which is provided at both sides of the exposing unit in the arrangement direction. The body frame is made of a conductive member. The exposing unit includes an exposing unit body having an exterior made of a resin; and an electrically conductive holding member which is longer than the exposing unit body in the arrangement direction, and which holds the exposing unit body, wherein the holding member is electrically connected to the body frame to be grounded. | 07-02-2009 |
20090169261 | Image Forming Apparatus - An image forming apparatus is provided. The image forming apparatus includes: plural photosensitive members; plural exposing units opposed to the photosensitive members, respectively, each of the exposing units including a plurality of light emitting elements arranged in a first direction; and a body frame which is provided at both sides of the exposing units in the first direction. Each of the exposing units includes: a gap maintaining member which abuts a respective one of the photosensitive members to define a distance between the exposing unit and the photosensitive member; a first-direction positioning portion which abuts the body frame in the first direction to position the exposing unit in the first direction; and a second-direction positioning portion which abuts the body frame in a second direction perpendicular to the first direction and an exposing direction of the light emitting elements, to position the exposing unit in the second direction. | 07-02-2009 |
20090322850 | Image Forming Appartaus - An image forming apparatus is provided, which includes: a photosensitive member; an exposure member; a gap keeping member; a positioning member and a swing regulating member. The swing regulating member is configured to come in contact with the exposure member at a contact position that is more upstream than the exposure member and that is more separated from the photosensitive member than a contact position between the positioning member and the exposure member. | 12-31-2009 |
20090322851 | Image Forming Apparatus and Method of Manufacturing the Same - An image forming apparatus is provided, which includes: a photosensitive member; an exposure member; a support frame supporting the exposure member; a gap keeping member; a pressing member; and an adjustment member. The adjust member is disposed between the exposure member and the support frame and configured to adjust a gap between the exposure member and the support frame to allow the exposure member to move in an optical axis direction. | 12-31-2009 |
20100020301 | Exposure Device and Method for Producing the Same - There is provided an exposure device including an exposure head having a light-emitting member which has a plurality of light-emitting sections arranged in a row and a casing which holds the light-emitting member and which is elongated in a longitudinal direction orthogonal to an optical axis direction of a light emitted from the light-emitting sections; and an elongated frame member fixed to the casing and having a reference portion at which the frame member is positioned with respect to the light-emitting sections; wherein the frame member is fixed to the casing such that the frame member is positioned with respect to the light-emitting sections in both of the longitudinal direction and a width direction of the casing, the width direction being orthogonal to the longitudinal direction and the optical axis direction. The exposure device is capable of performing exposure precisely at a desired exposure position. | 01-28-2010 |
20100053585 | Exposure Apparatus and Image Forming Apparatus Provided with the Same - An exposure apparatus which exposes an object includes an exposure member which has a plurality of blinking sections and which is elongated in a predetermined longitudinal direction; a support frame which supports the exposure member; a holder which supports the support frame to be movable relative to the holder; and a pressing member which is provided between the holder and the support frame and which presses the support frame in a direction away from the holder. Accordingly, the exposure apparatus can suppress the deformation of the exposure member. | 03-04-2010 |
20100054802 | Image Forming Apparatus - An image forming apparatus includes a photoconductive body on which an electrostatic latent image is formed; an exposure member which has a plurality of blinking sections and which exposes the photoconductive body; a support frame which is made of resin and which supports the exposure member; a roller shaft which is made of metal and provided on the support frame; a roller which is made of resin, which is rotatably provided on the roller shaft and which maintains a spacing distance between the exposure member and the photoconductive body; and a metal plate which supports and is electrically connected to the roller shaft and which is electrically grounded. With the image forming apparatus, it is possible to solve a problem caused when the roller shaft is electrically floated, and to suitably arrange parts or components around the roller shaft. | 03-04-2010 |
20100054813 | Image Forming Apparatus - An image forming apparatus includes a photoconductive body on which an electrostatic latent image is formed, an exposure unit which exposes the photoconductive body, a first pressing member which presses the exposure unit toward the photoconductive body, a first positioning member which makes a contact with the exposure unit, a second positioning member which is arranged at a side nearer to the photoconductive body than the first positioning member in an optical axial direction of light, and a second pressing member which presses the exposure unit toward the second positioning member. A point of action at which the first pressing member presses the exposure unit is positioned at a side nearer to the photoconductive body, than the first positioning member in the optical axial direction. It is possible to suppress a degradation of an image quality by suppressing an effect of vibrations with respect to the exposure unit. | 03-04-2010 |
20110037823 | IMAGE FORMING APPARATUS WITH A PLURALITY OF EXPOSURE UNITS - An image forming apparatus includes: a lower body including a plurality of photosensitive members and having an opening; an upper body which is configured to open and cover the opening; a plurality of exposure units which are supported by the upper body and which are opposed to the photosensitive members when the cover covers the opening; a main substrate provided in the housing; an exposure control substrate which is provided to the upper body and controls light emission of the exposure units; a plurality of first cables which electrically connect the exposure units to the exposure control substrate, respectively, each of the first cables including a plurality of signal lines; and a second cable which electrically connects the exposure control substrate to the main substrate and which includes at least one signal line, a number of which is smaller than a total number of the signal lines included in the first cables. | 02-17-2011 |
20110255905 | IMAGE FORMING APPARATUS HAVING EXPOSING UNIT POSITIONING MEMBER - An image forming apparatus is provided. The image forming apparatus includes: plural photosensitive members; plural exposing units opposed to the photosensitive members, respectively, each of the exposing units including a plurality of light emitting elements arranged in a first direction; and a body frame which is provided at both sides of the exposing units in the first direction. Each of the exposing units includes: a gap maintaining member which abuts a respective one of the photosensitive members to define a distance between the exposing unit and the photosensitive member; a first-direction positioning portion which abuts the body frame in the first direction to position the exposing unit in the first direction; and a second-direction positioning portion which abuts the body frame in a second direction perpendicular to the first direction and an exposing direction of the light emitting elements, to position the exposing unit in the second direction. | 10-20-2011 |
20120026566 | Multi-Beam Light Source Device and Multi-Beam Light Scanning Device - A multi-beam light source device and a multi-beam scanning device including the multi-beam light source device are provided. The multi-beam light source device includes: a light source including: a cylindrical package having a side edge portion which extends in a rotational direction about a rotational axis line defined as a first direction; a plurality of light emitting units which are disposed in the cylindrical package and configured to emit laser light in the first direction; and a housing which holds the light source. The housing has a holder that holds the side edge portion of the cylindrical package to be relatively rotatable in the rotational direction. The holder is formed with at least one opening which exposes the side edge portion of the light source. | 02-02-2012 |
20120195608 | IMAGE FORMING APPARATUS - In an image forming apparatus, a quantized amount of correction A is applied to emission timing with which each light-emitting point is to be caused to give off light emission to thereby align points of exposure to light emitted from the light-emitting points, substantially with a straight line extending in the main scanning direction on a photoconductor. The amount of correction A is adjusted by adding or subtracting one to or from one of the tentatively determined amounts of correction A | 08-02-2012 |
20120224162 | IMAGE FORMING APPARATUS - Positions in a main scanning direction of points of exposure are determined by emission of light from two light-emitting points of each exposure device near predetermined endmost light-emitting points. A first exposure device of which a distance between the two light-emitting points is greatest is identified based on the determined positions of the points of exposure. A subset of usable light-emitting points of a second exposure device other than the first exposure device, located in positions corresponding to a range of exposure which coincides in a width direction with a range of exposure defined by the two light-emitting points of the first exposure device, is specified The number n of pairs of adjacent usable light-emitting points of the second exposure device each associated with one pixel is obtained by subtracting the number of usable light-emitting points of the first exposure device from that of the second exposure device. | 09-06-2012 |
20120230724 | IMAGE FORMING APPARATUS - An image forming apparatus including: a main body; a process cartridge being detachably mounted to the main body along a direction perpendicular to a rotational axis direction, the process cartridge including, the photosensitive member, and a charger facing a surface of the photosensitive member; and an exposure device including, a plurality of light emitting devices arranged along the rotational axis direction, and a facing part, wherein the facing part is a part of the exposure device that is positioned closest to the photosensitive member and faces the surface of the photosensitive member when seen from the rotational axis direction, at a state in which the process cartridge is mounted, and wherein the charger is positioned at an opposite side of the exposure device with respect to a second line which is parallel with the mounting direction and passes the facing part when seen from the rotational axis direction. | 09-13-2012 |
20120275819 | IMAGE FORMING APPARATUS - An image forming apparatus is provided, which includes a housing having a cover swingable around a rotational shaft, and first and second LED heads attached to the cover, a position of the first LED head relative to a first axis line around which a first photoconductive body is rotatable being more shifted toward the rotational shaft in a first direction than a position of the second LED head relative to a second axis line around which a second photoconductive body is rotatable, the first direction being a direction along which the first and second photoconductive bodies are arranged, the first and second axis lines being parallel to a second direction perpendicular to the first direction. | 11-01-2012 |
20130084089 | IMAGE FORMING APPARATUS AND METHOD OF SETTING EXPOSURE AMOUNT - An image forming apparatus and a method of setting an exposure amount are provided. The image forming apparatus includes a photosensitive member, an exposure device which expose the photosensitive member to form a latent image on the photosensitive member, a conveyance member which conveys a recording medium, an image forming unit which forms a plurality of density detection images corresponding to the image data and having different pixel densities on the conveyance member, a density detection unit which detects densities of the density detection images, and an exposure setting unit which compares respective detected image densities of the density detection images with reference densities corresponding to the respective density detection images, and sets an exposure amount according to a condition based on a combination of respective comparison results between the detected image densities and the reference densities. | 04-04-2013 |
20140204167 | Image Forming Apparatus Having Exposing Unit Positioning Member - An image forming apparatus is provided. The image forming apparatus includes: plural photosensitive members; plural exposing units opposed to the photosensitive members, respectively, each of the exposing units including a plurality of light emitting elements arranged in a first direction; and a body frame which is provided at both sides of the exposing units in the first direction. Each of the exposing units includes: a gap maintaining member which abuts a respective one of the photosensitive members to define a distance between the exposing unit and the photosensitive member; a first-direction positioning portion which abuts the body frame in the first direction to position the exposing unit in the first direction; and a second-direction positioning portion which abuts the body frame in a second direction perpendicular to the first direction and an exposing direction of the light emitting elements, to position the exposing unit in the second direction. | 07-24-2014 |