Patent application number | Description | Published |
20100208025 | EXPOSURE DEVICE, IMAGE FORMING APPARATUS AND COMPUTER-READABLE MEDIUM - An exposure device includes a reference current generating unit generating a reference current for each image of respective colors, a photoelectric current generating unit generating a photoelectric current in response to a light amount of the light emitting element, a driving unit driving the light emitting element, a first controller, a drive voltage holding unit holding a drive voltage given to the driving unit, a second controller controlling the driving unit based on the drive voltage held, a comparison current generating unit generates a comparison current, a difference current generating unit generating a difference current, of each color, corresponding to a difference between the reference current of each color and the comparison current. The first controller compares a value obtained by adding the difference current of each color to the photoelectric current with the comparison current to control the driving unit so that the photoelectric current becomes the reference current. | 08-19-2010 |
20100245527 | EXPOSURE DEVICE, IMAGE FORMING APPARATUS, AND COMPUTER-READABLE MEDIUM - An exposure device includes a plurality of light emitting elements, a load, a first supplying unit and a second supplying unit. The first supplying unit supplies a driving current to one of (i) light emitting elements used to form an image among the plurality of light emitting elements and (ii) the load, in accordance with a modulation signal. The first supplying unit supplies a bias current to the other. The second supplying unit supplies the bias current to light emitting elements not used to form the image among the plurality of light emitting elements, regardless of the modulation signal. | 09-30-2010 |
20120069120 | IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - An image forming apparatus including: a light scanning portion that lights a plurality of beams, and scans a surface to be scanned of an image carrier to form an electrostatic latent image; a detection portion that detects at least one lighted beam; an abnormality detection portion that transmits data to the light scanning portion via a transmission-line, causes the light scanning portion to light a beam, and detects abnormality of the transmission-line based on the detected beam; and a setting portion that sets a number of beams to be lighted in the case of the formation of the electrostatic latent image so that an amount of light of the detected beam in the case of abnormality detection of the transmission-line is equal to or more than a minimum amount of light of the detected beam in the case of the formation of the electrostatic latent image. | 03-22-2012 |
20120099161 | OPTICAL SCANNING DEVICE, IMAGE FORMING APPARATUS, AND OPTICAL SCANNING METHOD - An optical scanning device includes a housing, a light source that emits light, a rotatable polygon mirror that receives the light from the light source while rotating and deflects the light by reflecting the light in a direction corresponding to an angle of rotation thereof, a scanning optical system that guides the light from the rotatable polygon mirror to a scanning object in such a manner as to repeatedly scan the scanning object with the light, and an intermediate member that is provided between an optical member included in the scanning optical system and the housing. The intermediate member is connected to the optical member with rubber adhesive and is also connected to the housing with the rubber adhesive. | 04-26-2012 |
20120105563 | EXPOSURE DEVICE AND IMAGE FORMING APPARATUS - An exposure device includes light emitting elements, a driving circuit, an image-signal connector, a power connector, and an adjustment-control-signal connector. The light emitting elements emit light which an exposure target member is exposed to. The driving circuit performs one of first and second drive operations. The image-signal connector has terminals connected to core wires of an image-signal cable, and relays, to the driving circuit, image signals transmitted through the image-signal cable. In the image-signal cable, the core wires are arranged at a first pitch. The power connector has terminals arranged at a pitch wider than the first pitch, and relays, to the driving circuit, power transmitted through power cables. The adjustment-control-signal connector has terminals arranged at a pitch wider than the first pitch, and relays, to the driving circuit, light-amount adjustment control signals transmitted through adjustment-control-signal cables. | 05-03-2012 |
20120105569 | OPTICAL SCANNING DEVICE AND IMAGE FORMING APPARATUS - An optical scanning device includes a housing, a light source, a rotatable polygon mirror deflecting a light beam from the light source, a scanning optical system scanning a scanning object with the light beam from the polygon mirror, first and second reflective mirrors one of which is provided inside a deflection area, and a photodetector detecting the timing of scanning of the scanning object with the light beam from the one of the first and second reflective mirrors. The scanning object is one of first and second scanning objects. The housing includes first and second supports configured to support the first and second reflective mirrors at first and second positions, respectively, that are outside first and second scan-use areas, respectively. The first position is also inside the second scan-use area. The first and second scan-use areas are used for the scanning of the first and second scanning objects, respectively. | 05-03-2012 |
20120113485 | OPTICAL SCANNING APPARATUS AND IMAGE FORMING APPARATUS - An optical scanning apparatus includes a light source, a rotating polygonal mirror, a scanning optical system, a detector, and a light emission controller. The light source includes plural light emitting elements. The rotating polygonal mirror is irradiated with light beams. While rotating, the rotating polygonal mirror reflects and deflects, in a deflecting direction, light beams emitted from light emitting elements in a first direction to propagate through one point in the deflecting direction substantially at the same time. The scanning optical system causes the reflected and deflected light beams to scan over an object. The detector detects the timing at which a light beam propagates through a detection point. When the light beams propagate through the detection point, the light emission controller causes light emitting elements in a row in the first direction other than light emitting elements at both ends of a projection plane to emit light. | 05-10-2012 |
20120114347 | IMAGE FORMING APPARATUS - An image forming apparatus includes a photosensitive member that rotates and is subjected to exposure so that a latent image is formed thereon, a driver that rotates the photosensitive member, an exposure section that exposes the photosensitive member by irradiating the photosensitive member with light, a light intensity adjustment section that receives a part of the light from the exposure section and adjusts intensity of the light irradiated by the exposure section, and an adjustment controller that causes the driver to start rotating the photosensitive member and causes the light intensity adjustment section to start adjusting the intensity of the light after a rotation speed of the photosensitive member exceeds a predetermined threshold value. | 05-10-2012 |