Patent application number | Description | Published |
20090003870 | IMAGE FORMING APPARATUS - An image forming apparatus for forming an image with developing toner on an exposed portion has a mode in which a toner image is automatically output onto a recording material without using exposure by an exposure device. When an inclination adjustment of a corona charging device is performed using an output image on the recoding material, the image forming apparatus can output an image for adjusting the inclination of the charging device that is not affected by variation of an exposing light amount of the exposure device. | 01-01-2009 |
20100111554 | IMAGE FORMING APPARATUS INCLUDING CORONA CHARGER - An image forming apparatus includes a photosensitive member; a corona charger, provided with an opening opposing the photosensitive member, for electrically charging the photosensitive member; image forming means for forming an image on the photosensitive member electrically charged by the corona charger; a sheet-like member for covering and uncovering the opening of the corona charger with respect to the photosensitive member; and control means for controlling a rotating operation of the photosensitive member so as to be started at a predetermined time in a period from start of an opening operation of the sheet-like member for starting image formation to end of the opening operation of the sheet-like member. | 05-06-2010 |
20100158550 | CORONA CHARGER INCLUDING SHUTTER - A charging device includes a corona charger, provided with an opening opposing a photosensitive member, for electrically charging the photosensitive member; a sheet-like member provided so that the sheet-like member can cover the opening; a movable device for moving the sheet-like member; and a regulating device for regulating a shape of the sheet-like member so that a central portion of the sheet-like member protrudes toward the corona charger with respect to a circumferential direction of the photosensitive member. | 06-24-2010 |
20100158571 | CORONA CHARGER INCLUDING SHUTTER - A charging device includes a corona charger for electrically charging a photosensitive member; a sheet-like member for covering and uncovering an opening of the corona charger; regulating device for regulating a shape of the sheet-like member so that a central portion of the sheet-like member protrudes toward the corona charger with respect to a widthwise direction of the sheet-like member; and a winding-up device for winding up the sheet-like member such a surface of said sheet-like member as is remote from the photosensitive member is inside. | 06-24-2010 |
20110222898 | IMAGE FORMING APPARATUS - An image forming apparatus includes a corona charger having an opening, a shutter configured to open and close the opening of the corona charger, a humidity sensor configured to detect humidity, and a control unit configured to control the so that time from ending an image forming process to closing the opening using the shutter is reduced when the humidity detected by the humidity sensor increases. | 09-15-2011 |
20110222899 | CHARGING DEVICE - The present invention provides a charging device which can suppress the deterioration of a photosensitive member and the occurrence of an image deletion phenomenon on an electrophotographic image due to an electric discharge product having deposited on a charger shutter, even when having been used for a long period of time. The charging device has an image bearing member which bears an image thereon, a charging member which charges the image bearing member, and a shielding member which shields the charging member from the image bearing member, wherein the shielding member includes a specific material. | 09-15-2011 |
20110222909 | CHARGING DEVICE - A charging device includes a corona charger; a shutter of a sheet for shielding an opening of said corona charger, the sheet having such a property that it is curled about an axis when said shutter absorbs moisture; and a winding-up device for winding up the shutter. The axis and a winding-up direction in which the shutter is wound up by the winding-up means form an angle therebetween from 45 degrees to 135 degrees. | 09-15-2011 |
20130164036 | CHARGING DEVICE - The present invention provides a charging device which can suppress the deterioration of a photosensitive member and the occurrence of an image deletion phenomenon on an electrophotographic image due to an electric discharge product having deposited on a charger shutter, even when having been used for a long period of time. The charging device has an image bearing member which bears an image thereon, a charging member which charges the image bearing member, and a shielding member which shields the charging member from the image bearing member, wherein the shielding member includes a specific material. | 06-27-2013 |
20140212175 | CORONA CHARGER INCLUDING SHUTTER - A charging device includes a corona charger, provided with an opening opposing a photosensitive member, for electrically charging the photosensitive member; a sheet-like member provided so that the sheet-like member can cover the opening; a movable device for moving the sheet-like member; and a regulating device for regulating a shape of the sheet-like member so that a central portion of the sheet-like member protrudes toward the corona charger with respect to a circumferential direction of the photosensitive member. | 07-31-2014 |