Patent application number | Description | Published |
20080204676 | IMAGE FORMING APPARATUS AND METHOD - An image forming apparatus includes an image bearing member; charging means for charging a surface of the image bearing member; image exposure means for exposing the surface of the image bearing member charged by the charging means to light to form an electrostatic image on the surface of the image bearing member; switching means for switching a light emission level of the image exposure means in accordance with the set point of a light emission amount setting the light emission level of the image exposure means; storing means for storing light emission amount set points set corresponding to different target light emission levels of the image exposure means; light emission amount control means for controlling the light emission level of the image exposure means on the basis of information stored in the storing means; an input portion for inputting information relating to an actual light emission level of the image exposure means corresponding to a predetermined light emission amount set point; and correcting means for correcting the light emission amount set points stored in the storing means on the basis of the information relating to the light emission amounts of the image exposure means corresponding to different light emission amount set points. | 08-28-2008 |
20090269105 | CORONA CHARGER AND ELECTROPHOTOGRAPHIC APPARATUS - A corona charger includes a charging wire and a plate grid. The plate grid comprises a stainless steel base and a surface layer formed of tetrahedral amorphous carbon on the base. | 10-29-2009 |
20100158558 | IMAGE FORMING APPARATUS - An image forming apparatus includes a photosensitive member configured to form a toner image thereon, a corona charger located opposite the photosensitive member and including a discharging wire and a grid electrode, a bias applying unit configured to apply a bias to the corona charger, a cleaning unit configured to perform cleaning processing by sliding in a longitudinal direction of the grid electrode to rub an inner surface of the grid electrode, and an execution unit configured to execute a cleaning mode for performing the cleaning processing by the cleaning unit while applying a bias of a polarity equal to a normal charging polarity of toner to the grid electrode by the bias applying unit. | 06-24-2010 |
20120201553 | IMAGE FORMING APPARATUS - An image forming apparatus includes a rotatable image bearing member; a first charging member for electrically charging the image bearing member; a second charging member, provided downstream of the first charging member with respect to a rotational direction of the image bearing member, for electrically charging the image bearing member; an applying device for applying a voltage to the first charging member and the second charging member; a detecting device for a DC current passing through the second charging member; and a controller for controlling, when an AC voltage and a DC voltage are applied to the second charging member while a DC voltage is applied to the first charging member, the DC voltage applied to the second charging member so that an absolute value of the DC current detected by the detecting device is within a predetermined range. | 08-09-2012 |
20120224876 | IMAGE FORMING SYSTEM - An image forming system includes a first image forming station including a first toner image forming portion for transferring the toner image onto a sheet, and a first image heating portion; a second image forming station including a second toner image forming portion onto the sheet received from the first image heating portion, and a second image heating portion; a controller capable of executing an operation in a first mode in which a predetermined image formation in accordance with an inputted image forming condition is effected using the first and second image forming stations, a second mode in which it is effected without using the second image forming portion; and a temperature controller for the second image heating portion in the second mode so as to be smaller than a temperature of the second image heating portion in the first mode. | 09-06-2012 |
20120288290 | IMAGE FORMING SYSTEM - A multiply-connecting image forming system in which a second image forming apparatus forms an image on a recording material on which an image has been formed by a first image forming apparatus, the multiply-connecting image forming system suppressing degradation in quality of an output image when only the second image forming apparatus continues duplex image formation because the first image forming apparatus has run out of toner during the duplex image formation. | 11-15-2012 |
20130156450 | IMAGE FORMING APPARATUS - If the length of an adjustment toner image is longer than a circumferential length of a photosensitive member, a voltage which is less than a discharge start voltage is applied while a region of the photosensitive member irradiated with light by an optical sensor passes through a transfer portion. Further, a voltage which is greater than or equal to the discharge start voltage is applied while the photosensitive member rotates at least once after the region of the photosensitive member irradiated with light by the optical sensor passes through the transfer unit. As a result, density unevenness in the adjustment toner image and a potential change in the photosensitive member due to the optical sensor exposing the adjustment toner image are prevented. | 06-20-2013 |
20130156451 | IMAGE FORMING APPARATUS FOR ADJUSTING IMAGE FORMING CONDITIONS - An image forming apparatus in which an optical sensor for detecting an adjustment toner image of black color is disposed on an image bearing member and an optical sensor for detecting adjustment toner images of other colors is disposed on an intermediate transfer member. With this configuration, even if the adjustment toner images of black and other colors simultaneously pass through a transfer portion for black color to reduce downtime, it is possible to reduce an effect on the subsequent image caused by light irradiation from the optical sensor and, at the same time, to prevent adjustment toner images of other colors from being excessively retransferred to the image bearing member (for black color) due to discharge. Control is performed such that a voltage less than a discharge start voltage is applied. | 06-20-2013 |
20140044448 | CHARGING DEVICE - A grid of a charging device is cleaned without causing the grid to contact a member to be charged. In this structure, to suppress non-uniform charging due to wear of the grid, which is pulled toward a discharge electrode, for a long time, first and second protective layers are provided. The first protective layer is provided on a surface of a base member of the grid that faces the cleaning member. The second protective layer is provided on a surface of the base member that faces the pressing member. The second protective layer is thicker than the first protective layer. | 02-13-2014 |
20140044449 | CHARGING DEVICE - A shutter that suppresses accumulation of discharge products on a photosensitive member is disposed between a grid and the photosensitive member. In this structure, to suppress corrosion of the grid due to the discharge products for a long time, first and second protective layers are provided. The first protective layer is provided on a surface of a base member of the grid that faces the discharge electrode. The second protective layer is provided on a surface of the base member that faces the shutter. The second protective layer is thicker than the first protective layer. | 02-13-2014 |