Patent application number | Description | Published |
20080198435 | SCANNING OPTICAL APPARATUS AND METHOD, AND IMAGE FORMING APPARATUS - A scanning optical apparatus includes a plurality of rotatable polygonal mirrors for scanningly deflecting laser beams; a plurality of optical members provided across optical paths of the beams deflected by the rotatable polygonal mirrors; vibration detecting means for detecting vibration of at least one of the optical members during driving of the rotatable polygonal mirrors; phase control means for controlling a phase relation between the rotatable polygonal mirrors on the basis of an output of the vibration detecting means. | 08-21-2008 |
20090141328 | OPTICAL SYSTEM, IMAGE FORMING APPARATUS, AND CONTROL METHOD THEREOF - An image forming apparatus performs multi-color image formation using a plurality of scanning type optical devices which deflect and scan an optical beam using a rotating polygonal mirror. The image forming apparatus includes, for example, a detecting unit that detects a phase of rotating speed unevenness of rotating polygonal mirrors respectively provided in the plurality of scanning type optical devices, and an adjusting unit that adjusts, based on a phase of rotating speed unevenness detected for each rotating polygonal mirror, the rotating speed of each rotating polygonal mirror to reduce the phase differences between the phases. | 06-04-2009 |
20090142084 | IMAGE FORMING APPARATUS - An image forming apparatus includes an image bearing member configured to bear an image, an exposure unit configured to draw a scanning line on the image bearing member by exposing the image bearing member according to image data, and at least two detection units configured to detect an amount of deviation in exposing position due to the exposure unit. The image forming apparatus further includes a drive unit configured to drive an optical part located on an optical path extending from the exposure unit to the image bearing member to reduce the amount of deviation, a measurement unit configured to measure an amount of driving of the drive unit, an estimation unit configured to estimate a residual amount of deviation, and a modulation unit configured to modulate a writing frequency in the exposure unit based on the measured amount of driving to reduce the estimated residual amount of deviation. | 06-04-2009 |
20090244670 | OPTICAL SCANNING APPARATUS - An optical scanning apparatus includes a light source for emitting light, a deflecting device including a deflecting element for deflection-scanning a surface to be scanned with the light emitted from the light source and including a motor for driving the deflecting element, and an optical system casing including a supporting surface for disposing thereon the deflecting device and including a wall provided to stand on the supporting surface and to face the deflecting element. At a portion at which the wall stands on the supporting surface, an opening is provided so as to extending along the wall. | 10-01-2009 |
20120081770 | OPTICAL SCANNING APPARATUS - An optical scanning apparatus includes a light source for emitting light, a deflecting device including a deflecting element for deflection-scanning a surface to be scanned with the light emitted from the light source and including a motor for driving the deflecting element, and an optical system casing including a supporting surface for disposing thereon the deflecting device and including a wall provided to stand on the supporting surface and to face the deflecting element. At a portion at which the wall stands on the supporting surface, an opening is provided so as to extending along the wall. | 04-05-2012 |
20130194372 | OPTICAL SCANNING APPARATUS AND COLOR IMAGE FORMING APPARATUS THEREWITH - An optical scanning apparatus that is capable of increasing use life of a semiconductor laser by decreasing the emission time for sensors that are independently provided for synchronous control, light control, and focus control. A laser beam emitted from a light source is deflected by a deflector, and scans a photoconductor. A beam splitter arranged between the light source and the deflector separates the laser beam, which is detected by a first detection unit. A second detection unit arranged in a non-image forming area detects the deflected laser beam to detect defocus amount. A focusing unit focuses the scanning laser beam based on a detection result of the second detection unit. A control unit controls the light amount of the laser beam applied to an image forming area based on a detection result of the first detection unit at the timing when the second detection unit detects the laser beam. | 08-01-2013 |
20130286143 | LIGHT SCANNING APPARATUS AND IMAGE FORMING APPARATUS INCLUDING LIGHT SCANNING APPARATUS - A resin BD lens having a property of refracting a light beam in a direction corresponding to a main scanning direction may cause a variation in generation timing difference among a plurality of horizontal synchronization signals and accordingly degrade accuracy to correct the starting position of an electrostatic latent image. The present invention uses a glass BD lens having a property of refracting a light beam in a direction corresponding to the main scanning direction. | 10-31-2013 |
20130286144 | IMAGE FORMING APPARATUS INCLUDING MULTI-BEAM OPTICAL SCANNING APPARATUS - A plurality of light beams are simultaneously scanned on a surface of a photosensitive member. The surface of the photosensitive member has a curvature factor, and therefore, the light beams have different optical path lengths. Due to differences in the optical path length, a length (scanning width) of a scanning line of one light beam is different from that of another light beam. When a temperature of an optical scanning apparatus increases, the optical path length differences vary, so that differences in magnification between the beams also vary. Therefore, by obtaining correction amounts for the scanning widths depending on the temperature, the light beams are allowed to have substantially the same scanning width even when the temperature of the optical scanning apparatus varies. | 10-31-2013 |
20130286145 | LIGHT SCANNING APPARATUS AND IMAGE FORMING APPARATUS INCLUDING THE SAME - A light scanning apparatus, including: a light source configured to emit a light beam; a beam splitter configured to split the light beam into a first and a second light beams; a rotary polygon mirror configured to deflect the first light beam to scan a photosensitive member; a motor configured to rotate the rotary polygon mirror; a first lens configured to guide the first light beam to the photosensitive member; an optical sensor configured to receive the second light beam; a second lens configured to condense the second light beam on the optical sensor; and an optical box has a wall standing from a bottom surface between a region in which the rotary polygon mirror and the motor are disposed and a region in which the second lens is disposed, and a height of the wall from the bottom surface is higher than a height of the rotary polygon mirror. | 10-31-2013 |